U.S. patent application number 16/522477 was filed with the patent office on 2020-04-02 for laminating roller, laminating device and method for laminating display apparatus.
The applicant listed for this patent is SAMSUNG DISPLAY CO., LTD.. Invention is credited to Kyungmin CHOI, Jiwon HAN, Seung-ho JUNG, Taehyeog JUNG, Wonbaek LEE, Jaiku SHIN.
Application Number | 20200101708 16/522477 |
Document ID | / |
Family ID | 69947182 |
Filed Date | 2020-04-02 |
![](/patent/app/20200101708/US20200101708A1-20200402-D00000.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00001.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00002.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00003.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00004.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00005.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00006.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00007.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00008.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00009.png)
![](/patent/app/20200101708/US20200101708A1-20200402-D00010.png)
View All Diagrams
United States Patent
Application |
20200101708 |
Kind Code |
A1 |
SHIN; Jaiku ; et
al. |
April 2, 2020 |
LAMINATING ROLLER, LAMINATING DEVICE AND METHOD FOR LAMINATING
DISPLAY APPARATUS
Abstract
A laminating roller, a laminating device, and a method for
laminating a display apparatus are provided. A laminating device
includes a stage on which a display module including a folding area
foldable about a folding axis and at least one non-folding area,
which is not folded, is configured to be seated; a pressing part
over the stage to overlap the non-folding area and having a
diameter; and a connection part over the stage to overlap the
folding area and connected to the pressing part, and the connection
part has a diameter less than that of the pressing part and extends
in a direction perpendicular to the folding axis.
Inventors: |
SHIN; Jaiku; (Hwaseong-si,
KR) ; HAN; Jiwon; (Anyang-si, KR) ; LEE;
Wonbaek; (Yongin-si, KR) ; JUNG; Seung-ho;
(Hwaseong-si, KR) ; JUNG; Taehyeog; (Hwaseong-si,
KR) ; CHOI; Kyungmin; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SAMSUNG DISPLAY CO., LTD. |
Yongin-si |
|
KR |
|
|
Family ID: |
69947182 |
Appl. No.: |
16/522477 |
Filed: |
July 25, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B32B 2457/206 20130101;
B32B 37/10 20130101; H01L 51/56 20130101; B32B 2457/20 20130101;
B32B 37/0053 20130101 |
International
Class: |
B32B 37/00 20060101
B32B037/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 28, 2018 |
KR |
10-2018-0116422 |
Claims
1. A laminating device comprising: a stage on which a display
module including a folding area foldable about a folding axis and
at least one non-folding area, which is not folded, is configured
to be seated; a pressing part over the stage to overlap the
non-folding area and having a diameter; and a connection part over
the stage to overlap the folding area and connected to the pressing
part, wherein the connection part has a diameter less than that of
the pressing part and extends in a direction perpendicular to the
folding axis.
2. The laminating device of claim 1, wherein the pressing part
comprises: a first pressing part to overlap a first non-folding
area of the non-folding area; and a second pressing part to overlap
a second non-folding area of the non-folding area, wherein the
connection part connects the first pressing part to the second
pressing part.
3. The laminating device of claim 2, wherein the connection part
comprises: a first connection part connected to the first pressing
part; a second connection part connected to the second pressing
part; and a central part between the first connection part and the
second connection part to connect the first connection part to the
second connection part and having a diameter less than a mean
diameter of each of the first connection part and the second
connection part.
4. The laminating device of claim 3, wherein each of the first
connection part and the second connection part has a diameter that
gradually decreases in a direction that is adjacent to the central
part.
5. The laminating device of claim 3, wherein the central part has a
predetermined diameter.
6. The laminating device of claim 2, wherein each of the first
pressing part, the second pressing part, and the connection part
comprises: a core part extending in the direction perpendicular to
the folding axis and having a first modulus; and a first cover part
configured to surround an outer surface of the core part and having
a second modulus less than the first modulus.
7. The laminating device of claim 6, wherein the core part
comprises a metal.
8. The laminating device of claim 6, wherein the first cover part
comprises urethane.
9. The laminating device of claim 6, wherein at the connection
part, at least a part of the core part is exposed by the first
cover part.
10. The laminating device of claim 6, wherein each of the first
pressing part, the second pressing part, and the connection part
further comprises a second cover part having a thickness and
surrounding an outer surface of the first cover part.
11. The laminating device of claim 10, wherein the second cover
part comprises rubber.
12. The laminating device of claim 2, wherein each of the first
pressing part, the second pressing part, and the connection part
comprises a core part extending in the direction perpendicular to
the folding axis and having a first modulus, and each of the first
pressing part and the second pressing part further comprises a
first cover part configured to surround an outer surface of the
core part and having a second modulus less than the first
modulus.
13. A method for laminating a display apparatus, the method
comprising: seating a plurality of plates on a seating area defined
on a stage; seating a first adhesion member on the plates; seating
a display module foldable about a folding axis on the first
adhesion member; and pressing the display module to laminate the
plates with the display module, wherein the seating area comprises:
first and second areas defined on the stage to be spaced apart from
each other and overlap with non-folding areas of the display
module; and a third area defined between the first and second areas
on the stage to overlap with a folding area of the display module
and comprising a spaced area, wherein, in the seating of the
plurality of plates, the plates are spaced apart from each other
over the spaced area, and the folding axis overlaps the spaced area
on a plane, and in the laminating of the plates with the display
module, a pressing force applied to the third area is less than
that applied to each of the first and second areas.
14. The method of claim 13, wherein, in the laminating of the
plates with the display module, the display module is pressed by
using a laminating roller, which extends in a direction
perpendicular to the folding axis on the plane and rotates to move
in a direction parallel to the folding axis.
15. The method of claim 14, wherein the laminating roller
comprises: first and second pressing parts overlapping the first
and second areas to press the non-folding areas of the display
module; and a connection part connecting the first and second
pressing parts to each other and overlapping at least the third
area to press the folding area of the display module, wherein the
connection part has a diameter less than that of each of the
pressing parts.
16. The method of claim 15, wherein the connection part comprises:
a first connection part connected to the first pressing part; a
second connection part connected to the second pressing part; and a
central part connecting the first connection part to the second
connection part and pressing the folding area of the display module
overlapping the spaced area, wherein the central part has a
diameter that is equal to or less than a mean diameter of each of
the first connection part and the second connection part.
17. The method of claim 16, wherein at least a portion of the
laminating roller has an outer circumferential surface that has a
modulus less than that of the central part.
18. The method of claim 14, wherein the laminating roller
comprises: first and second pressing parts overlapping the first
and second areas to press the non-folding areas of the display
module; and a connection part connecting the first and second
pressing parts to each other and overlapping at least the third
area to press the folding area of the display module, wherein each
of the first and second pressing parts has a modulus greater than
that of the connection part.
19. The method of claim 13, wherein the display module comprises a
display panel comprising a plurality of display elements to display
an image.
20. A laminating roller comprising: a connection part configured to
press a folding area of a display module that is foldable about a
folding axis; and first and second pressing parts configured to
press non-folding areas of the display module supported by plates
spaced apart from each other and are connected to each other by the
connection part and each of which has a diameter greater than that
of the connection part, wherein the connection part, the first
pressing part, and the second pressing part are integrated with
each other and extend in a direction perpendicular to the folding
axis.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This patent application claims priority to and the benefit
of Korean Patent Application No. 10-2018-0116422, filed on Sep. 28,
2018 in the Korean Intellectual Property Office, the entire content
of which is hereby incorporated by reference.
BACKGROUND
1. Field
[0002] Aspects of embodiments of the present disclosure relate to a
laminating roller, a laminating device, and a method for laminating
a display apparatus.
2. Description of Related Art
[0003] A display apparatus displays various images on a display
screen to provide information to a user. In recent years, a display
apparatus including a flexible display member to be foldable and
rollable is being developed. The flexible display apparatus may be
foldable or rollable like a paper, unlike a flat panel display
apparatus. The flexible display apparatus that is variously
changeable in shape may be easily carried and may improve a user's
convenience.
SUMMARY
[0004] According to aspect of embodiments of the present disclosure
a display apparatus having improved durability and display quality
and a method for laminating a display apparatus having improved
durability and display quality are provided.
[0005] According to one or more embodiments of the inventive
concept, a laminating device includes: a stage on which a display
module including a folding area foldable about a folding axis and
at least one non-folding area, which is not folded, is configured
to be seated; a pressing part over the stage to overlap the
non-folding area and having a diameter; and a connection part over
the stage to overlap the folding area and connected to the pressing
part, and the connection part has a diameter less than that of the
pressing part and extends in a direction perpendicular to the
folding axis.
[0006] In an embodiment, the pressing part may include: a first
pressing part to overlap a first non-folding area of the
non-folding area; and a second pressing part to overlap a second
non-folding area of the non-folding area, wherein the connection
part may connect the first pressing part to the second pressing
part.
[0007] In an embodiment, the connection part may include: a first
connection part connected to the first pressing part; a second
connection part connected to the second pressing part; and a
central part between the first connection part and the second
connection part to connect the first connection part to the second
connection part and having a diameter less than a mean diameter of
each of the first connection part and the second connection
part.
[0008] In an embodiment, each of the first connection part and the
second connection part may have a diameter that gradually decreases
in a direction that is adjacent to the central part.
[0009] In an embodiment, the central part may have a predetermined
diameter.
[0010] In an embodiment, each of the first pressing part, the
second pressing part, and the connection part may include: a core
part extending in the direction perpendicular to the folding axis
and having a first modulus; and a first cover part configured to
surround an outer surface of the core part and having a second
modulus less than the first modulus.
[0011] In an embodiment, the core part may include a metal.
[0012] In an embodiment, the first cover part may include
urethane.
[0013] In an embodiment, at the connection part, at least a part of
the core part may be exposed by the first cover part.
[0014] In an embodiment, each of the first pressing part, the
second pressing part, and the connection part may further include a
second cover part having a thickness and surrounding an outer
surface of the first cover part.
[0015] In an embodiment, the second cover part may include
rubber.
[0016] In an embodiment, each of the first pressing part, the
second pressing part, and the connection part may include a core
part extending in the direction perpendicular to the folding axis
and having a first modulus, and each of the first pressing part and
the second pressing part may further include a first cover part
configured to surround an outer surface of the core part and having
a second modulus less than the first modulus.
[0017] According to one or more embodiments of the inventive
concept, a method for laminating a display apparatus includes:
seating a plurality of plates on a seating area defined on a stage;
seating a first adhesion member on the plates; seating a display
module foldable about a folding axis on the first adhesion member;
and pressing the display module to laminate the plates with the
display module, wherein the seating area includes: first and second
areas defined on the stage to be spaced apart from each other and
overlap with non-folding areas of the display module; and a third
area defined between the first and second areas on the stage to
overlap with a folding area of the display module and including a
spaced area, wherein, in the seating of the plurality of plates,
the plates may be spaced apart from each other over the spaced
area, and the folding axis may overlap the spaced area on a plane,
and in the laminating of the plates with the display module, a
pressing force applied to the third area may be less than that
applied to each of the first and second areas.
[0018] In an embodiment, in the laminating of the plates with the
display module, the display module may be pressed by using a
laminating roller, which extends in a direction perpendicular to
the folding axis on the plane and rotates to move in a direction
parallel to the folding axis.
[0019] In an embodiment, the laminating roller may include: first
and second pressing parts overlapping the first and second areas to
press the non-folding areas of the display module; and a connection
part connecting the first and second pressing parts to each other
and overlapping at least the third area to press the folding area
of the display module, wherein the connection part may have a
diameter less than that of each of the pressing parts.
[0020] In an embodiment, the connection part may include: a first
connection part connected to the first pressing part; a second
connection part connected to the second pressing part; and a
central part connecting the first connection part to the second
connection part and pressing the folding area of the display module
overlapping the spaced area, wherein the central part may have a
diameter that is equal to or less than a mean diameter of each of
the first connection part and the second connection part.
[0021] In an embodiment, the laminating roller may include: first
and second pressing parts overlapping the first and second areas to
press the non-folding areas of the display module; and a connection
part connecting the first and second pressing parts to each other
and overlapping at least the third area to press the folding area
of the display module, wherein each of the first and second
pressing parts may have a modulus greater than that of the
connection part.
[0022] In an embodiment, at least a portion of the laminating
roller may have an outer circumferential surface that has a modulus
less than that of the central part.
[0023] In an embodiment, the display module may include a display
panel including a plurality of display elements to display an
image.
[0024] According to one or more embodiments of the inventive
concept, a laminating roller includes: a connection part configured
to press a folding area of a display module that is foldable about
a folding axis; and first and second pressing parts configured to
press non-folding areas of the display module supported by plates
spaced apart from each other and are connected to each other by the
connection part and each of which has a diameter greater than that
of the connection part, wherein the connection part, the first
pressing part, and the second pressing part may be integrated with
each other and extend in a direction perpendicular to the folding
axis.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The accompanying drawings are included to provide a further
understanding of the inventive concept, and are incorporated in and
constitute a part of this specification. The drawings illustrate
some exemplary embodiments of the inventive concept and, together
with the description, serve to explain principles of the inventive
concept. In the drawings:
[0026] FIG. 1 is a view of a laminating device according to an
embodiment of the inventive concept;
[0027] FIG. 2 is a perspective view of a display apparatus on which
the lamination is completed;
[0028] FIG. 3 is an exploded perspective view of the display
apparatus of FIG. 2;
[0029] FIG. 4 is a cross-sectional view taken along the line I-I'
of FIG. 2;
[0030] FIG. 5 is an enlarged cross-sectional view of a display
module of the display apparatus of FIG. 2;
[0031] FIG. 6 is a perspective view illustrating a state in which
the display apparatus of FIG. 2 is folded;
[0032] FIG. 7 is a cross-sectional view illustrating a state in
which the display apparatus of FIG. 2 is folded;
[0033] FIG. 8 is a perspective view of a laminating roller
according to an embodiment of the inventive concept;
[0034] FIG. 9 is a cross-sectional view of the laminating device of
FIG. 1;
[0035] FIG. 10 is a transverse cross-sectional view of a laminating
roller according to an embodiment of the inventive concept;
[0036] FIG. 11 is a cross-sectional view taken along the line
II-II' of FIG. 8;
[0037] FIGS. 12A to 12E are cross-sectional views, respectively, of
rollers according to some other embodiments of the inventive
concept;
[0038] FIG. 13 is an exploded perspective view of a display
apparatus according to another embodiment of the inventive
concept;
[0039] FIG. 14 is a cross-sectional view illustrating a state in
which the display apparatus of FIG. 13 is folded;
[0040] FIG. 15 is a cross-sectional view of a laminating device for
the display apparatus of FIG. 13;
[0041] FIG. 16 is a flowchart illustrating a method for laminating
the display apparatus according to an embodiment; and
[0042] FIGS. 17A to 17E are cross-sectional views, respectively, of
rollers according to some other embodiments of the inventive
concept.
DETAILED DESCRIPTION
[0043] Aspects and features of the inventive concept, and
implementation methods thereof will be clarified through some
exemplary embodiments described with reference to the accompanying
drawings. The inventive concept may, however, be embodied in
different forms and should not be construed as limited to the
embodiments set forth herein. Rather, these embodiments are
provided so that this disclosure will be thorough and complete, and
will fully convey the scope of the inventive concept to those
skilled in the art.
[0044] In this specification, it is also to be understood that when
one component (or region, layer, portion) is referred to as being
"on," "connected to," or "coupled to" another component, it may be
directly disposed/connected/coupled on/to the one component, or one
or more intervening third components may also be present.
[0045] Like reference numerals refer to like elements throughout.
Also, in the figures, the thicknesses, ratios, and dimensions of
components may be exaggerated for clarity of illustration.
[0046] The term "and/or" includes any and all combinations of one
or more of the associated listed items.
[0047] It is to be understood that although terms such as "first"
and "second" are used herein to describe various elements, these
elements should not be limited by these terms. The terms are used
to distinguish one component from other components. For example, a
first element referred to as a "first" element in one embodiment
can be referred to as a "second" element in another embodiment
without departing from the scope of the appended claims. The terms
of a singular form may include plural forms unless referred to the
contrary.
[0048] Also, "under," "below," "above,` "upper," and the like may
be used for explaining relation association of components
illustrated in the drawings. The terms may be a relative concept
and described based on directions expressed in the drawings.
[0049] Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by a person of ordinary skill in the art to which this
invention belongs. Also, terms such as defined terms in commonly
used dictionaries are to be interpreted as having meanings
consistent with meaning in the context of the relevant art and are
expressly defined herein unless interpreted in an ideal or overly
formal sense.
[0050] The meaning of "include" or "comprise" specifies a property,
a fixed number, a step, an operation, an element, a component, or a
combination thereof, but does not exclude other properties, fixed
numbers, steps, operations, elements, components, or combinations
thereof.
[0051] Herein, some exemplary embodiments of the inventive concept
will be described with reference to the accompanying drawings.
[0052] FIG. 1 is a view of a laminating device according to an
embodiment of the inventive concept.
[0053] Referring to FIG. 1, a laminating device LMD for a display
apparatus according to an embodiment of the inventive concept
includes a stage STG and a laminating roller RL.
[0054] Objects DM and SP to be laminated may be seated on the stage
STG. The laminating device LMD according to an embodiment may be
used for manufacturing a display apparatus DD (see FIG. 2) for
displaying an image. That is, the objects DM and SP to be laminated
according to an embodiment may be components of the display
apparatus DD (see FIG. 2). The display apparatus DD (see FIG. 2)
may include a display module DM, a support part SP, and a first
adhesion member AD1.
[0055] As a result, the laminating device LMD may be used for
attaching the display module DM to the support part SP.
[0056] A seating area STA is defined on a top surface of the stage
STG. The objects DM and SP to be laminated may be seated on the
seating area STA. In an embodiment, the seating area STA includes a
first area AR1, a second area AR2, and a third area AR3. The first
area AR1 and the second area AR2 are spaced apart from each other.
The third area AR3 is disposed between the first area AR1 and the
second area AR2. The third area AR3 includes a spaced area SA
defined at a center of the third area AR3. The spaced area SA
extends in a first direction DR1. The first area AR1 and the second
area AR2 face each other in a second direction DR2 perpendicular to
the first direction DR1 on a plane.
[0057] In an embodiment, a normal direction on a top surface of the
stage STG is indicated by a third direction DR3. A front surface
(or a top surface) and a rear surface (or a bottom surface) of each
of members is indicated by the third direction DR3. The front
surface (or the top surface) and the rear surface (or the bottom
surface) of each of the members may be distinguished by the third
direction DR3. However, directions indicated by the first to third
direction DR1, DR2, and DR3 may be a relative concept and thus
changed into different directions.
[0058] The laminating roller RL is disposed on the stage STG. The
laminating roller RL has a shape that extends in the second
direction DR2. For convenience of description, in following
description, the laminating roller RL may be referred to as a
roller RL.
[0059] The roller RL is used for providing a pressing force to the
display module DM. The pressing force is provided in a downward
direction from the third direction DR3 toward the stage STG. The
display module DM may be attached to the support part SP by the
pressing force.
[0060] The roller RL may rotate in a direction (e.g., a
predetermined direction) RD to linearly move on the stage STG. In
an embodiment, a direction MD in which the roller RL moves is
parallel to the first direction DR1.
[0061] FIG. 2 is a perspective view of the display apparatus on
which the lamination is completed; and FIG. 3 is an exploded
perspective view of the display apparatus of FIG. 2. FIG. 4 is a
cross-sectional view taken along the line I-I' of FIG. 2.
[0062] Referring to FIGS. 2 to 4, the display apparatus DD
manufactured by using the laminating device according to an
embodiment of the inventive concept has a rectangular shape with a
short side in the first direction DR1 and a long side in the second
direction DR2. However, the display apparatus DD according to
embodiments of the inventive concept is not limited to the
above-described shape and thus may have any of various shapes.
[0063] The display apparatus DD may be a flexible display apparatus
DD. Particularly, the display apparatus DD according to an
embodiment of the inventive concept may be folded or unfolded with
respect to a folding axis FX extending in the first direction DR1.
That is, the display apparatus may be a folding-type (foldable)
display apparatus DD. The display apparatus DD may be divided into
a plurality of areas according to a folded state.
[0064] In an embodiment, the display apparatus DD may be divided
into a folding area FA and at least one non-folding area NFA1 and
NFA2, which are arranged on the plane. The folding area FA may be
an area to which folding stress due to the folding is applied. The
folding area FA may overlap the folding axis FX on the plane.
[0065] According to an embodiment, the folding area FA of the
display apparatus DD is defined between the two non-folding areas
NFA1 and NFA2. Herein, the non-folding areas NFA1 and NFA2 may be
referred to as a first non-folding area NFA1 and a second
non-folding area NFA2. The first non-folding area NFA1 may be
adjacent to one side of the folding area FA in the second direction
DR2, and the second non-folding area NFA2 may be adjacent to the
other side of the folding area FA in the second direction DR2.
[0066] The folding area FA, the first non-folding area NFA1, and
the second non-folding area NFA2 may be defined on the planes of
members constituting the display apparatus DD.
[0067] For example, the first non-folding area NFA1 of the display
module DM, the first adhesion member AD1, and the support part SP
may be seated on the first area AR1 of the stage STG, and the
second non-folding area NFA2 may be seated on the second area AR2
of the stage STG. The folding area FA may be seated on the third
area AR3 of the stage STG.
[0068] In an embodiment, one third area AR3 is defined on the stage
STG, and one folding area FA is defined on the display apparatus
DD, but embodiments of the inventive concept are not limited
thereto. For example, according to another embodiment of the
inventive concept, a plurality of third areas AR3 may be defined on
the stage STG, and a plurality of folding areas FA may be defined
on the display apparatus DD according to a number of folding axes
FX.
[0069] In an embodiment, the display module DM overlaps the first
to third areas AR1 to AR3 over the entire area. An area of the
display module DM on the plane may correspond to the seating area
STA.
[0070] The display module DM may be divided into an active area AR
and a peripheral area NAR on the plane defined by the first
direction DR1 and the second direction DR2. In an embodiment, the
active area AR may be defined at a central portion of the display
module DM on the plane. The peripheral area NAR is adjacent to the
active area AR. In an embodiment, the peripheral area NAR may
surround the active area AR. In an embodiment, the peripheral area
NAR is defined in a frame shape surrounding the active area AR.
[0071] However, embodiments of the inventive concept are not
limited to the shapes and number of the active area AR and the
peripheral area NAR. For example, the display module DM according
to another embodiment of the inventive concept may include only the
active area AR. Here, the active area AR may be provided in
plurality, and the plurality of active areas AR may be spaced apart
from each other.
[0072] FIG. 5 is an enlarged cross-sectional view of the display
module of FIG. 2.
[0073] Referring to FIG. 5 together with FIGS. 2 and 3, in an
embodiment, the display module DM includes a display panel PNL, an
input sensing layer ISP, an antireflection layer RPP, and a window
WD.
[0074] The display panel PNL includes a base layer BSL, a display
layer CRL, and an encapsulation layer PTL. The base layer BSL
defines a rear surface of the display panel PNL. The base layer BSL
may be a base layer for forming electrodes including the display
panel PNL and display elements. For example, the base layer BSL may
be provided in the form of a substrate.
[0075] The display layer CRL is disposed on the base layer BSL.
[0076] According to an embodiment of the inventive concept, a kind
of the display panel PNL may be determined according to the
configuration of the display layer CRL. The display panel PNL may
be an organic light emitting display panel, a liquid crystal
display panel, an electrophoretic display panel, or an
electrowetting display panel, or may be one of various display
panels capable of displaying images. In addition, the display panel
PNL according to the inventive concept may include various
embodiments, but is not limited to one embodiment. In the drawings
that will be described below, a case in which the display panel PNL
is the organic light emitting display panel will be described as an
example.
[0077] The display layer CRL includes a plurality of display
elements (not shown) and a plurality of transistors (not shown) for
driving the display elements. Each of the display elements of the
display panel PNL according to an embodiment may be an organic
light emitting diode OLED (not shown).
[0078] The encapsulation layer PTL is disposed on the display layer
CRL. The encapsulation layer PTL covers the display layer CRL to
protect the display layer CRL from the outside. The encapsulation
layer PTL may include an inorganic material.
[0079] The input sensing layer ISP is disposed on the display panel
PNL. The input sensing layer ISP senses an external input provided
to the display apparatus DD. For example, the input sensing layer
ISP may sense an external input inputted through the human body
USER (see FIG. 2) of a user. According to the inventive concept,
the external input is not limited to a specific method. According
to another embodiment of the inventive concept, the external input
may be inputted in a manner such as an optical, touch, or magnetic
manner. Although not shown, the input sensing layer ISP may include
a plurality of input sensing electrodes (not shown) sensing the
external input.
[0080] The input sensing layer ISP may sense the external input in
any of various manners. For example, the input sensing layer ISP
may be driven in a capacitance, resistive, or coordinate
recognition manner.
[0081] The antireflection layer RPP is disposed on the input
sensing layer ISP. The antireflection layer RPP overlaps the active
area AR on the plane. The antireflection layer RPP may prevent or
substantially prevent external light incident into the display
device DD from the outside from being reflected by the display
panel PNL and visible to the user. In an embodiment, although not
shown, the antireflection layer RPP may include a polarizing layer
(not shown) and a phase retardation layer (not shown).
[0082] The polarizing layer has a transmission axis and an
absorption axis perpendicular to the transmission axis. One
component of components of external light incident into the
polarizing layer may be absorbed into or reflected by the
absorption axis such that the light does not pass the polarizing
layer. A component perpendicular to the one component of the
components of the external light incident into the polarizing layer
may pass through the polarizing layer. That is, the polarizing
layer may linearly polarize the external light.
[0083] In an embodiment, the polarizing layer may be made of a
polymer resin elongated in a specific direction. However,
embodiments of the inventive concept are not limited to a kind of
polarizing layer. For example, in another embodiment of the
inventive concept, the polarizing layer may be a wire grid
polarizer.
[0084] The phase retardation layer is disposed below the polarizing
layer. The phase retardation layer has optical anisotropy. Thus,
the phase retardation layer may retard a phase of one component of
the incident light. That is, the phase retardation layer may
convert a polarized state of the light. For example, the phase
retardation layer may retard a phase of one component of the
incident light by a wavelength of about .lamda./4. That is, the
phase retardation layer may be a quadrature wavelength film. Thus,
the phase of the one component of the light passing through the
phase retardation layer may be retarded to convert the linearly
polarized state into a circularly polarized state or convert the
circularly polarized state into the linearly polarized state.
[0085] Thus, even though the external light incident into the
display apparatus DD from the outside is reflected by the display
module DM, the polarized state may be converted by the phase
retardation layer to absorb or reflect the light by the polarizing
layer. That is, the external light reflected by the display panel
PNL may be invisible from the outside.
[0086] The window WD is disposed on the antireflection layer RPP.
In an embodiment, the window WD provides an entire surface of the
display apparatus DD to protect the antireflection layer RPP, the
input sensing layer ISP, and the display panel PNL.
[0087] The display module DM may further include a second adhesion
member AD2. In an embodiment, the second adhesion member AD2 is
provided as a plurality of module adhesion members MAD1 to MAD3.
Each of the module adhesion members MAD1 to MAD3 may be disposed
between the above-described members to couple the members to each
other. In an embodiment, the first module adhesion member MAD1 is
disposed between the display panel PNL and the input sensing layer
ISP. The second module adhesion member MAD2 is disposed between the
input sensing layer ISP and the antireflection layer RPP. The third
module adhesion member MAD3 is disposed between the antireflection
layer RPP and the window WD.
[0088] Although not shown, the display module DM may further
include a cushion member (not shown). The cushion member (not
shown) may be disposed below the display panel PNL to support the
display panel PNL.
[0089] According to another embodiment of the inventive concept, at
least one of the input sensing layer ISP, the antireflection layer
RPP, or the window WD may be omitted.
[0090] Referring again to FIGS. 1 to 4, the support part SP is
disposed below the display module DM to support the display module
DM. The support part SP may have a plate shape. The support part SP
may have rigidity greater than that of the display module DM. For
example, the support part SP may include a metal material. However,
the embodiment of the inventive concept is not specifically limited
to the material of the support part SP.
[0091] In an embodiment, the support part SP includes a plurality
of plates including a first plate SSP1 and a second plate SSP2. The
first plate SSP1 is disposed at one side in the second direction
DR2. The first plate SSP1 overlaps a portion of the folding area FA
and the first non-folding area NFA1. That is, the first plate SSP1
is seated on a portion of the third area AR3 and the first area
AR1.
[0092] The second plate SSP2 is disposed at the other side in the
second direction DR2. The second plate SSP2 overlaps the other
portion of the folding area FA and the second non-folding area
NFA2. That is, the second plate SSP2 is seated on the other portion
of the third area AR3 and the second area AR2.
[0093] The first plate SSP1 and the second plate SSP2 are disposed
to be spaced apart from each other in the second direction DR2. The
spaced space overlaps the spaced area SA. That is, the first plate
SSP1 and the second plate SSP2 are disposed on the seating area STA
except for the spaced area SA and are respectively disposed on both
sides with respect to the spaced area SA in the second direction
DR2. The first plate SSP1 and the second plate SSP2 do not overlap
the spaced area SA.
[0094] In an embodiment, the first adhesion member AD1 is provided
in plurality. In FIGS. 1 to 4, two first adhesion members AD1 are
provided as an example. The two first adhesion members AD1 are
arranged in the second direction DR2. The first adhesion members
AD1 are spaced apart from each other with the third area AR3
therebetween. In an embodiment, one first adhesion member AD1 of
the two first adhesion members AD1 entirely overlaps the first area
AR1, and the remaining first adhesion member AD1 entirely overlaps
the second area AR2. Thus, the support part SP and the display
module DM do not adhere to each other on the folding area FA
overlapping the third area AR3.
[0095] FIG. 6 is a perspective view illustrating a state in which
the display apparatus of FIG. 2 is folded; and FIG. 7 is a
cross-sectional view illustrating a state in which the display
apparatus of FIG. 2 is folded;
[0096] Referring to FIGS. 6 and 7, the display apparatus DD
according to an embodiment of the inventive concept may be a
foldable display apparatus. For example, the display apparatus DD
may be an in-foldable display apparatus. That is, since the display
apparatus DD may be in-folded with respect to the folding axis FX,
folded top surfaces of the display module DM may face each other.
In the in-folded state, the first and second plates SSP1 and SSP2
of the support part SP may face each other with the display module
DM therebetween. In an embodiment, each of the first and second
plates SSP1 and SSP2 are not changed in shape. In an embodiment, in
the in-folded state, the first and second support plates SSP1 and
SSP2 are disposed in parallel to each other with the display module
DM therebetween.
[0097] FIG. 8 is a perspective view of a laminating roller
according to an embodiment of the inventive concept; and FIG. 9 is
a cross-sectional view of the laminating device of FIG. 1.
[0098] Referring to FIGS. 8 and 9, the roller RL according to an
embodiment of the inventive concept extends in the second direction
DR2. The roller RL may rotate with respect to a central axis RX
parallel to the second direction DR2.
[0099] The roller RL includes at least one pressing part FRL1 and
FRL2 and a connection part CNR. In the following description, an
embodiment in which the roller RL includes two pressing parts FRL1
and FRL2 is described as an example.
[0100] The plurality of pressing parts FRL1 and FRL2 includes a
first pressing part FRL1 and a second pressing part FRL2. The first
pressing part FRL1 overlaps the first area AR1. The first pressing
part FRL1 presses the first non-folding area NFA1 of the display
module DM. The second pressing part FRL2 overlaps the second area
AR2. The second pressing part FRL2 presses the second non-folding
area NFA2 of the display module DM. The first pressing part FRL1
and the second pressing part FRL2 are arranged in the second
direction DR2, and each of the first pressing part FRL1 and the
second pressing part FRL2 has a cylindrical shape that extends in
the second direction DR2. The first pressing part FRL1 and the
second pressing part FRL2 are spaced apart from each other in the
second direction DR2.
[0101] The connection part CNR is disposed between the first
pressing part FRL1 and the second pressing part FRL2 in the second
direction DR2. The connection part CNR connects the first pressing
part FRL1 to the second pressing part FRL2. The connection part CNR
overlaps the third area AR3, i.e., the folding area FA of the
display module DM.
[0102] In an embodiment, the connection part CNR includes a first
connection part CP1, a second connection part CP2, and a central
part CT. The central part CT is disposed between the first
connection part CP1 and the second connection part CP2. The central
part CT overlaps the spaced area SA.
[0103] The first connection part CP1 is disposed between the
central part CT and the first pressing part FRL1 to connect the
central part CT to the first pressing part FRL1. The second
connection part CP2 is disposed between the central part CT and the
second pressing part FRL2 to connect the central part CT to the
second pressing part FRL2.
[0104] The first pressing part FRL1, the second pressing part FRL2,
and the connection part CNR are connected to each other to provide
an integrated shape.
[0105] According to an embodiment of the inventive concept, each of
the first pressing part FRL1 and the second pressing part FRL2 has
a constant diameter. In an embodiment, the first pressing part FRL1
has a same diameter as that of the second pressing part FRL2. In an
embodiment, each of the first pressing part FRL1 and the second
pressing part FRL2 has a diameter greater than a mean diameter of
the connection part CNR. Herein, a diameter of the roller RL will
be described in further detail with reference to FIG. 11.
[0106] FIG. 10 is a transverse cross-sectional view of the
laminating roller RL; and FIG. 11 is a cross-sectional view taken
along the line II-II' of FIG. 8.
[0107] Although only the configurations of the first pressing part
FRL1 and the first connection part CP1 are illustrated in FIG. 11,
since the roller RL according to an embodiment of the inventive
concept passes through a center of the roller RL in the second
direction DR2 and is symmetrical with respect to a central line CTL
extending in the third direction DR3, description with respect to a
configuration of the second pressing part FRL2 and the second
connection part CP2 will be omitted.
[0108] Referring to FIGS. 10 and 11, in an embodiment, each of the
first pressing part FRL1, the second pressing part FRL2, and the
connection part CNR includes a core part CR and a first cover part
SH1 disposed in a direction that is away from the central axis RX
of the roller RL.
[0109] The core part CR include the central axis RX. The core part
CR extends in the second direction DR2. The core part CR has a
first modulus. In an embodiment, for example, the first modulus may
be equal to or greater than about 10 GPa. In an embodiment, the
core part CR may include a metal material.
[0110] The first cover part SH1 surround an outer circumferential
surface of the core part CR. The first cover part SH1 extends in
the second direction DR2. In an embodiment, the first cover part
SH1 has a uniform thickness. The first cover part SH1 has a second
modulus. The second modulus has a value less than that of the first
modulus. In an embodiment, for example, the second modulus may be
in a range of about 1 GPa to about 10 GPa. In an embodiment, the
first cover part SH1 may include urethane.
[0111] According to an embodiment of the inventive concept, the
first pressing part FRL1 overlapping the first area AR1 has a first
total diameter DS1. Here, the core part CR of the first pressing
part FRL1 has a first core diameter DC1. The first total diameter
DS1 and the first core diameter DC1 on the first area AR1 may have
a predetermined value.
[0112] The first connection part CP1 has a funnel shape. That is,
the first connection part CP1 may have a diameter that gradually
decreases in a direction that is away from the first pressing part
FRL1 and adjacent to the central part CT. That is, the first
connection part CP1 may include an inclined surface in a
cross-section of the roller RL.
[0113] In an embodiment, the inclined surface of the first
connection part CP1 may have a linear shape, but is not limited
thereto. In another embodiment of the inventive concept, the
inclined surface may include a curved surface.
[0114] The central part CT has a second total diameter DS2. The
second total diameter DS2 is less than the first total diameter
DS1. Also, the first total diameter DS1 is less than a mean
diameter of the first connection part CP1.
[0115] The core part CR of the central part CT has a second core
diameter DC2. The second core diameter DC2 is less than the first
core diameter DC1. Each of the second total diameter DS2 and the
second core diameter DC2 may have a predetermined value on the
spaced area SA (see FIG. 9). In an embodiment, a cross-section of
the central part CT does not include an inclined surface.
[0116] Unlike embodiments of the inventive concept, when a roller
pressing the display module DM has a cylindrical shape having a
predetermined diameter on the entire area, the pressing force
applied to the folding area FA of the display module DM may be the
same as that applied to the non-folding area NFA of the display
module DM. Here, a portion of the display module DM corresponding
to the folding area FA may be recessed downward by the stepped
portion between the plates SSP1 and SSP2 supporting the display
module DM, on which the first adhesion member AD1 is not disposed,
and the display module DM. That is, a portion of the display module
DM overlapping the third area AR3 may be recessed downward. In this
case, the display apparatus DD on which the lamination is completed
may be deteriorated in display quality. However, according to an
embodiment of the inventive concept, since each of the first and
second pressing parts FRL1 and FRL2 of the roller RL has a diameter
greater than that of the connection part CNR, the pressing force
applied to the folding area FA of the display module DM may be less
than that applied to each of the non-folding areas NFA1 and NFA2.
That is, a phenomenon in which the display module DM is recessed
downward may be moderated.
[0117] Also, unlike embodiments of the inventive concept, a portion
of the display module DM corresponding to the spaced area SA
between the plates SSP1 and SSP2 may be relatively recessed
downward when compared to other portions of the display module on
the areas except for the spaced area SA to deteriorate the display
quality. However, according to an embodiment of the inventive
concept, since the central part CT has a diameter equal to or less
than that of each of the first connection part CP1 and the second
connection part CP2, a phenomenon in which the display module DM is
recessed on the spaced area SA may be moderated.
[0118] As a result, according to embodiments of the inventive
concept, the display quality of the display apparatus DD may be
improved.
[0119] FIGS. 12A to 12E are cross-sectional views, respectively, of
rollers according to some other embodiments of the inventive
concept.
[0120] For convenience of description, differences between these
embodiments and the foregoing embodiment will be mainly described,
and omitted descriptions will be derived from the foregoing
embodiment. Also, the same reference symbols are given to the same
components, and duplicated descriptions with respect to the
components will be omitted.
[0121] As illustrated in FIG. 12A, a first pressing part FRL1 of a
roller RL-1 according to another embodiment of the inventive
concept includes a core part CR and a first cover part SH1. The
first pressing part FRL1 has a first total diameter DS1. Here, the
core part CR of the first pressing part FRL1 has a first core
diameter DC1.
[0122] In an embodiment, a connection part CNR-1 may include only
the core part CR, but may not include the first cover part SH1.
That is, in the roller RL-1, the core part CR may be exposed to the
outside at a third area AR3 (see FIG. 9) overlapping the connection
part CNR-1, i.e., the first cover part SH1 on the folding area
FA.
[0123] In an embodiment, the first connection part CP1 has a
predetermined diameter. In an embodiment, the first connection part
CP1 may not include an inclined surface. In an embodiment, the core
part CR of the first connection part CP1 has the first core
diameter DC1.
[0124] The central part CT has a predetermined diameter. The
central part CT has a second total diameter DS2. The second total
diameter DS2 is less than the first total diameter DS1. Since the
central part CT does not include the first cover part SH1, the
central part CT may have a second total diameter DS2 that is the
same as a second core diameter DC2 of the core part CR of the
central part CT.
[0125] As illustrated in FIG. 12B, a cross-section of a connection
part CNR-2 of a roller RL-2 according to another embodiment of the
inventive concept may have a funnel shape. That is, each of a first
connection part CP1 and a central part CT of the connection part
CNR-2 may have a diameter that gradually decreases in a direction
that is adjacent to a central line CTL.
[0126] As illustrated in FIG. 12C, a first pressing part FRL1 and a
connection part CNR-3 of a roller RL-3 according to another
embodiment of the inventive concept include core parts CR having
the same diameter, respectively. That is, the core part CR of the
connection part CNR-3 has a first core diameter DC1.
[0127] The first pressing part FRL1 includes a core part CR and a
first cover part SH1. The first pressing part FRL1 has a first
total diameter DS1. Here, the core part CR of the first pressing
part FRL1 has a first core diameter DC1.
[0128] According to an embodiment, the first cover part SH1 of the
first connection part CP1 may have a thickness that gradually
decreases in a direction that is adjacent to the central part
CT.
[0129] In an embodiment, the central part CT includes only the core
part CR. That is, the central part CT does not include the first
cover part SH1. Thus, the central part CT has a third total
diameter DS3. The third total diameter DS3 is the same as the first
core diameter DC1.
[0130] As illustrated in FIG. 12D, a first pressing part FRL1 and a
connection part CNR-4 of a roller RL-4 according to another
embodiment of the inventive concept include core parts CR having
the same diameter, respectively. That is, the core part CR of the
connection part CNR-4 has a first core diameter DC1.
[0131] According to an embodiment, each of the first connection
part CP1 and the central part CT includes only the core part CR,
but does not include the first cover part SH1. Thus, the connection
part CNR-4 has a third total diameter DS3. Here, the third total
diameter DS3 is the same as the first core diameter DC1.
[0132] As illustrated in FIG. 12E, a roller RL-5 according to
another embodiment of the inventive concept includes a connection
part CNR-5 and further includes a second cover part SH2 surrounding
an outer circumferential surface of the first cover part SH1. In an
embodiment, the second cover part SH2 has a uniform thickness. The
second cover part SH2 has a third modulus. In an embodiment, the
third modulus has a value less than the second modulus. In an
embodiment, for example, the third modulus may be less than about 1
GPa. In an embodiment, the second cover part SH2 may include
rubber.
[0133] FIG. 13 is an exploded perspective view of a display
apparatus according to another embodiment of the inventive concept;
and FIG. 14 is a cross-sectional view illustrating a state in which
the display apparatus of FIG. 13 is folded. FIG. 15 is a
cross-sectional view of a laminating device for the display
apparatus of FIG. 13.
[0134] For convenience of description, differences between this
embodiment and the foregoing embodiment will be mainly described,
and omitted descriptions will be derived from the foregoing
embodiment. Also, the same reference symbols are given to the same
components, and duplicated descriptions with respect to the
components will be omitted.
[0135] Referring to FIGS. 13 to 15, a support part SP-6 of a
display apparatus DD-6 according to another embodiment of the
inventive concept may further include a joint member JM. The joint
member JM is disposed between a first plate SSP1 and a second plate
SSP2 in the second direction DR2. The joint member JM overlaps a
folding area FA of a display module DM.
[0136] The joint member JM includes a plurality of joint bars JB.
Each of the joint bars JB extends in the first direction DR1, and
the joint bars JB are arranged in the second direction DR2.
Although not shown, the joint bars JB may be connected to each
other by a connection member (not shown). For example, the
connection member may be a hinge. The connection member may be
disposed between the plurality of joint bars JB. When the display
apparatus DD-6 is folded, each of the joint bars JB may rotate by a
distance (e.g., a predetermined distance) by using the connection
member as a center.
[0137] A first adhesion member AD is disposed between the display
module DM and a support part SP-6. In an embodiment, the first
adhesion member AD has a shape that entirely overlaps a seating
area STA. The first adhesion member AD may be provided in a single
shape. That is, in an embodiment, the first adhesion member AD may
overlap the folding area FA. Thus, a stepped portion may be
provided between the above-described support part SP-6 and the
display module DM.
[0138] According to an embodiment, when a laminating process of a
display apparatus is performed, a spot may be generated on a
display surface of the display module DM in the first direction DR1
by a space spaced between the plurality of joint bars JB. That is,
the display apparatus may be deteriorated in display quality.
However, according to an embodiment of the inventive concept, since
pressing force applied to the folding area FA is less than that
applied to non-folding areas NFA1 and NFA2, a deterioration in
display quality of the display apparatus DD-6 may be reduced when
the display apparatus DD-6 includes the joint member JM.
[0139] FIG. 16 is a flowchart illustrating a method for laminating
the display apparatus according to an embodiment.
[0140] Referring to FIGS. 1, 9, and 16, a method for laminating a
display apparatus DD includes a process (51) of seating first and
second plates SSP1 and SSP2 on a seating area STA on a stage STG, a
process (S2) of sequentially seating a first adhesion member AD1
and a display module DM on the first and second plates SSP1 and
SSP2, and a process (S3) of laminating the first and second plates
SSP1 and SSP2 and the display module DM.
[0141] According to an embodiment, in the process (S3) of the
laminating the first and second plates SSP1 and SSP2 and the
display module DM, a pressing force applied to a folding area FA of
the display module DM overlapping a third area AR3 of the seating
area STA is less than that applied to each of a first non-folding
area NFA1 of the display module DM overlapping a first area AR1 and
a second non-folding area NFA2 of the display module DM overlapping
a first area AR2. For example, the pressing force may be
differently applied for each area on the display module DM by using
the above-described roller RL. The roller RL moves in the first
direction DR1 parallel to a folding axis FX of the display
apparatus DD and has a shape extending in the second direction
DR2.
[0142] FIGS. 17A to 17E are cross-sectional views, respectively, of
rollers according to some other embodiments of the inventive
concept.
[0143] For convenience of description, differences between these
embodiments and the foregoing embodiments will be mainly described,
and omitted descriptions will be derived from the foregoing
embodiments. Also, the same reference symbols are given to the same
components, and duplicated descriptions with respect to the
components will be omitted.
[0144] Referring to FIGS. 17A to 17E, rollers RL-7, RL-8, RL-9,
RL-10, and RL-11 according to some other embodiment of the
inventive concept may have a predetermined diameter. A first
pressing part FRL1 and connection parts CNR-7, CNR-8, CNR-9,
CNR-10, and CNR-11 of the rollers RL-7, RL-8, RL-9, RL-10, and
RL-11 may have the same diameter.
[0145] Also, a modulus of each of the connection part CNR-7, CNR-8,
CNR-9, CNR-10, and CNR-11 of the respective rollers RL-7, RL-8,
RL-9, RL-10, and RL-11 may have a value less than that of the first
pressing part FRL1. When the display module DM and the support part
SP are combined with each other by using the rollers RL-7, RL-8,
RL-9, RL-10, and RL-11, a pressing force applied to the folding
area FA may be less than that applied to each of the first and
second non-folding areas NFA1 and NFA2. That is, deterioration in
display quality of the display apparatus DD on which the lamination
process is completed may be reduced.
[0146] As illustrated in FIG. 17A, the connection part CNR-7
according to another embodiment of the inventive concept further
includes a second cover part SH2. The second cover part SH2
surrounds an outer circumferential surface of the first cover part
SH1. The second cover part SH2 has a third modulus. The third
modulus has a value less than the second modulus.
[0147] According to an embodiment, the second cover part SH2 on the
first connection part CP1 may have a thickness that gradually
increases in a direction that is adjacent to the central part CT.
An increase rate in thickness of the second cover part SH2 provided
on the first connection part CP1 may be same as a decrease rate in
thickness of a core part CR provided in the first connection part
CP1.
[0148] As illustrated in FIG. 17B, core parts CR of the first
pressing part FRL1 and the connection part CNR-8 of the roller RL-8
according to another embodiment of the inventive concept may have
diameters different from each other. The core part CR of the first
pressing part FRL1 has a first core diameter DC1. The core part CR
of the connection part CNR-8 has a second core diameter DC2. The
second core diameter DC2 has a value less than that of the first
core diameter DC1. In an embodiment, each of the first core
diameter DC1 and the second core diameter DC2 has a predetermined
value.
[0149] An outer surface of the first cover part SH1 of the
connection part CNR-8 has a funnel shape in a cross-section. The
outer surface of the first cover part SH1 of the connection part
CNR-8 may be connected to an outer surface of the first cover part
SH1 of the first pressing part FRL1 and have a thickness that
gradually decreases in a direction that is adjacent to a central
line CTL.
[0150] The connection part CNR-8 may further include a second cover
part SH2. In an embodiment, the second cover part SH2 has a
thickness that gradually increases in a direction that is adjacent
to a central part CT. An increase rate in thickness of the second
cover part SH2 provided on a first connection part CP1 may be the
same as a decrease rate in thickness of a first cover part SH1
provided on the first connection part CP1.
[0151] As illustrated in FIG. 17C, the roller RL-9 according to
another embodiment of the inventive concept does not include the
first cover part SH1. Also, the connection part CNR-9 may further
include a second cover part SH2.
[0152] According to an embodiment, the second cover part SH2 on the
first connection part CP1 may have a thickness that gradually
increases in a direction that is adjacent to the central part CT.
An increase rate in thickness of the second cover part SH2 provided
on a first connection part CP1 may be the same as a decrease rate
in thickness of a core part CR provided in the first connection
part CP1.
[0153] As illustrated in FIG. 17D, core parts of a first pressing
part FRL1 and a connection part CNR-10 of a roller RL-10 according
to another embodiment of the inventive concept have diameters
different from each other. The core part CR of the first pressing
part FRL1 has a first core diameter DC1. The core part CR of the
connection part CNR-10 has a second core diameter DC2. The second
core diameter DC2 has a value less than that of the first core
diameter DC1. In an embodiment, each of the first core diameter DC1
and the second core diameter DC2 has a predetermined value.
[0154] In an embodiment, the first cover part SH1 has a uniform
thickness.
[0155] The connection part CNR-10 according to an embodiment may
further include an air layer AIR. The air layer AIR is disposed
between the core part CR and the first cover part SH1.
[0156] As illustrated in FIG. 17E, the core part CR provided in the
first connection part CP1 of the roller RL-11 according to another
embodiment of the inventive concept has a funnel shape in a
cross-section. That is, the core part CR provided in the first
connection part CP1 includes an inclined surface in the
cross-section. The core part CR of the first connection part CP1
has a diameter that gradually decreases in the direction that is
adjacent to the central part CT. In an embodiment, the core part CR
of the central part CT has a predetermined diameter.
[0157] In an embodiment, each of the first connection part CP1 of
the connection part CNR-11 and the central part CT further includes
an air layer AIR. The air layer AIR is disposed between the core
part CR and the first cover part SH1. In an embodiment, the air
layer AIR of the first connection part CP1 has a thickness that
gradually increases in the direction that is adjacent to the
central part CT, and the air layer AIR of the central part CT has a
predetermined thickness.
[0158] According to embodiments of the inventive concept, the
display quality of a display apparatus may be improved.
[0159] It will be apparent to those skilled in the art that various
modifications and variations can be made in the inventive concept.
Thus, it is to be understood that the present disclosure covers
such modifications and variations of this invention within the
scope of the appended claims and their equivalents. Thus, the scope
of the present invention is to be determined by the broadest
permissible interpretation of the claims and their equivalents, and
shall not be restricted or limited by the foregoing detailed
description.
* * * * *