U.S. patent application number 14/049363 was filed with the patent office on 2015-04-02 for liquid crystal display device and manufacturing method thereof.
This patent application is currently assigned to BOE Technology Group Co., Ltd.. The applicant listed for this patent is BOE Technology Group Co., Ltd.. Invention is credited to Zheng Fang, Jing Lv, Yuting Zhang.
Application Number | 20150092142 14/049363 |
Document ID | / |
Family ID | 47574417 |
Filed Date | 2015-04-02 |
United States Patent
Application |
20150092142 |
Kind Code |
A1 |
Zhang; Yuting ; et
al. |
April 2, 2015 |
LIQUID CRYSTAL DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF
Abstract
Embodiments of the present invention provide a liquid crystal
display device and a manufacturing method thereof. The device
comprises: an upper substrate, comprising: substrate; a color
filter and a black matrix, formed on a surface of the substrate
facing a lower substrate in the same layer; a lower substrate,
cell-assembled with the upper substrate and comprising: a base
substrate; a gate metal bus, a gate insulating layer, a
source/drain metal bus and a first insulating protection layer,
which are formed on the base substrate sequentially; a transparent
electrode, formed on the first insulating protection layer; and a
second insulating protection layer, covering the transparent
electrode; and a seal agent, provided at a periphery of a display
area of the liquid crystal display device, wherein an upper portion
of the seal agent is attached to the substrate and a lower portion
thereof is attached to the second insulating protection layer.
Inventors: |
Zhang; Yuting; (Beijing,
CN) ; Lv; Jing; (Beijing, CN) ; Fang;
Zheng; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BOE Technology Group Co., Ltd. |
Beijing |
|
CN |
|
|
Assignee: |
BOE Technology Group Co.,
Ltd.
Beijing
CN
|
Family ID: |
47574417 |
Appl. No.: |
14/049363 |
Filed: |
October 9, 2013 |
Current U.S.
Class: |
349/106 ;
438/125 |
Current CPC
Class: |
G02F 1/133345 20130101;
G02F 1/1339 20130101; G02F 1/13458 20130101; G02F 1/1368 20130101;
G02F 1/133512 20130101; G02F 1/13439 20130101; G02F 1/136227
20130101; H01L 27/1259 20130101; G02F 2201/50 20130101; G02F
2001/136231 20130101; G02F 1/136286 20130101; G02F 1/133514
20130101 |
Class at
Publication: |
349/106 ;
438/125 |
International
Class: |
G02F 1/1339 20060101
G02F001/1339; G02F 1/1368 20060101 G02F001/1368; G02F 1/1335
20060101 G02F001/1335; G02F 1/1333 20060101 G02F001/1333; G02F
1/1343 20060101 G02F001/1343; H01L 27/12 20060101 H01L027/12; G02F
1/1362 20060101 G02F001/1362 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 9, 2012 |
CN |
201210380833.6 |
Claims
1. A liquid crystal display device, comprising: an upper substrate,
comprising: a substrate; a color filter, formed on a surface of the
substrate facing a lower substrate; and a black matrix, formed in
the same layer with the color filter; a lower substrate,
cell-assembled with the upper substrate and comprising: a base
substrate; a gate metal bus, a gate insulating layer, a
source/drain metal bus and a first insulating protection layer,
which are formed on the base substrate sequentially; a transparent
electrode, formed on the first insulating protection layer; and a
second insulating protection layer, covering the transparent
electrode; and a seal agent, provided at a periphery of a display
area of the liquid crystal display device, wherein an upper portion
of the seal agent is attached to the substrate and a lower portion
thereof is attached to the second insulating protection layer.
2. The liquid crystal display device according to claim 1, wherein,
a first through hole passing through the gate insulating layer and
the first insulating protection layer is provided above the gate
metal bus, to expose a part of the gate metal bus, and a second
through hole passing through the first insulating protection layer
is provided above the source/drain metal bus, to expose a part of
the source/drain metal bus.
3. The liquid crystal display device according to claim 2, wherein,
the transparent electrode connects the gate metal bus and the
source/drain metal bus through the first through hole and the
second through hole.
4. The liquid crystal display device according to claim 1, wherein,
at the periphery of the display area of the liquid crystal display
device, there is the located second insulating protection
layer.
5. The liquid crystal display device according to claim 1, wherein,
the lower substrate is an array substrate.
6. The liquid crystal display device according to claim 1, wherein,
the upper substrate is a color filter substrate.
7. The liquid crystal display device according to claim 1, wherein,
the liquid crystal display device is a narrow-frame liquid crystal
display device.
8. The liquid crystal display device according to claim 1, wherein,
the seal agent is an ultraviolet curing seal agent.
9. A manufacturing method of the liquid crystal display device
according to claim 1, comprising following steps: Step A:
sequentially forming a gate metal bus, a gate insulating layer, a
source/drain metal bus and a first insulating protection layer on a
base substrate, wherein, a first through hole passing through the
gate insulating layer and the first insulating protection layer is
formed above the gate metal bus to expose a part of the gate metal
bus; Step B: on the base substrate obtained after the step A,
forming a second through hole above the source/drain metal bus,
which penetrates through the first insulating protection layer to
expose a part of the source/drain metal bus; Step C: on the base
substrate obtained after the step B, forming a transparent
electrode connecting the gate metal bus and the source/drain metal
bus through the first through hole and the second through hole
above the first insulating protection layer; Step D: forming a
second insulating protection layer on the base substrate obtained
after the step C which covers the transparent electrode, so that
obtaining a lower substrate; and Step E: using a seal agent to
adhere an upper substrate comprising a color filter and a black
matrix at the same layer and the second insulating protection
layer, and using an ultraviolet ray mask to irradiate and cure the
seal agent.
10. The method according to claim 9, wherein, the step D comprises
following steps: Step D1: sequentially depositing insulating
material and a photoresist over the first insulating protection
layer and the transparent electrode; Step D2: exposing the
photoresist on the insulating material using the ultraviolet light
mask, and developing the photoresist; Step D3: under protection of
the exposed and developed photoresist, etching the insulating
material to form the second insulating protection layer; and Step
D4: removing a residual photoresist.
11. The method according to claim 9, wherein, the step E comprises
following steps: E1: coating the seal agent at the periphery of the
display area of the liquid crystal display device so that it
adheres the upper substrate and the second insulating protection
layer; and E2: using the ultraviolet light mask to irradiate and
cure the seal agent.
12. The method according to claim 9, wherein, the seal agent is an
ultraviolet curing seal agent.
13. The method according to claim 9, wherein, the liquid crystal
display device is a narrow-frame liquid crystal display device.
14. The method according to claim 11, wherein, the using the
ultraviolet light mask to irradiate and cure the seal agent
comprises: providing a reflector below the base substrate; and
curing the seal agent by irradiating ultraviolet light from an
upper substrate side.
15. The method according to claim 11, wherein, the seal agent is
coated by using a seal agent coating device comprising an
ultraviolet irradiating member, and the seal agent is pre-cured
when coated.
16. The method according to claim 9, wherein, the ultraviolet light
mask comprises an ultraviolet light-transmitting region and an
ultraviolet light-blocking region.
17. The method according to claim 16, wherein, the ultraviolet
light-transmitting region corresponds to regions where the second
insulating protection layer is located.
18. The method according to claim 16, wherein, the ultraviolet
light-blocking region corresponds to a Data Pad region, a Gate Pad
region and a display region.
Description
TECHNICAL FIELD
[0001] Embodiments of the present invention relate to a liquid
crystal display device and a manufacturing method thereof.
BACKGROUND
[0002] Currently, liquid crystal display devices play a leading
role in the current flat panel display market due to features of
excellent display quality, relatively low manufacturing cost, low
power consumption, no-radiation and the like, and the display
quality is also improved constantly with development of the
manufacturing process technology.
[0003] Current liquid crystal display devices are formed by
injecting liquid crystal between two substrates which are sealed
with a seal agent and respectively attaching polarizers onto the
two substrates, wherein the polarizers have polarization directions
perpendicular to each other. Herein, the upper substrate is a color
filter substrate and the lower substrate is an array substrate, and
many thin film transistors arranged in the form of matrix and some
peripheral circuits are prepared on the array substrate.
[0004] FIG. 1 is a cross-sectional structural view of a frame
portion of a current liquid crystal display device, wherein the
frame is formed by curing a seal agent. As shown in FIG. 1, to
prevent generation of static electricity, near the frame, a part of
a gate metal bus needs to be connected with a part of the
source/drain metal bus through a transparent electrode. However,
during manufacturing the liquid crystal display device, the metal
electrode, that is, the transparent electrode, near the frame of
the liquid crystal display device may be eroded when the seal agent
is cured; also, in a narrow-frame TV product, the seal agent is
required to be close to a display region as much as possible,
therefore, a risk that the seal agent erodes the metal electrode
increases further.
SUMMARY
[0005] Embodiments of the present invention provide a liquid
crystal display device and a manufacturing method thereof, which
can prevent a seal agent from eroding a metal electrode near a
frame of the liquid crystal display device.
[0006] In one aspect, an embodiment of the present invention
provides a liquid crystal display device, comprising: an upper
substrate, comprising: a substrate; a color filter, formed on a
surface of the substrate facing a lower substrate; and a black
matrix, formed in the same layer with the color filter; a lower
substrate, cell-assembled with the upper substrate and comprising:
a base substrate; a gate metal bus, a gate insulating layer, a
source/drain metal bus and a first insulating protection layer,
which are formed on the base substrate sequentially; a transparent
electrode, formed on the first insulating protection layer; and a
second insulating protection layer, covering the transparent
electrode; and a seal agent, provided at a periphery of a display
area of the liquid crystal display device, wherein an upper portion
of the seal agent is attached to the substrate and a lower portion
thereof is attached to the second insulating protection layer.
[0007] In another aspect, an embodiment of the present invention
provides a manufacturing method of a liquid crystal display device,
comprising following steps: Step A: sequentially forming a gate
metal bus, a gate insulating layer, a source/drain metal bus and a
first insulating protection layer on a base substrate, wherein, a
first through hole passing through the gate insulating layer and
the first insulating protection layer is formed above the gate
metal bus to expose a part of the gate metal bus; Step B: on the
base substrate obtained after the step A, forming a second through
hole above the source/drain metal bus, which penetrates through the
first insulating protection layer to expose a part of the
source/drain metal bus; Step C: on the base substrate obtained
after the step B, forming a transparent electrode connecting the
gate metal bus and the source/drain metal bus through the first
through hole and the second through hole above the first insulating
protection layer; Step D: forming a second insulating protection
layer on the base substrate obtained after the step C which covers
the transparent electrode, so that obtaining a lower substrate; and
Step E: using a seal agent to adhere an upper substrate comprising
a color filter and a black matrix at the same layer and the second
insulating protection layer, and using an ultraviolet ray mask to
irradiate and cure the seal agent.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to clearly illustrate the technical solution of the
embodiments of the invention, the drawings of the embodiments will
be briefly described in the following; it is obvious that the
described drawings are only related to some embodiments of the
invention and thus are not limitative of the invention.
[0009] FIG. 1 is a schematic cross-sectional structural view of a
frame portion of a current liquid crystal display device;
[0010] FIG. 2 is a schematic cross-sectional structural view of a
frame portion of a liquid crystal display device according to a
first embodiment of the present invention; and
[0011] FIG. 3 is a plan view of an ultraviolet light mask used to
form a transparent electrode in a manufacturing method of a liquid
crystal display device according to a second embodiment of the
present invention.
DETAILED DESCRIPTION
[0012] In order to make objects, technical details and advantages
of the embodiments of the invention apparent, the technical
solutions of the embodiment will be described in a clearly and
fully understandable way in connection with the drawings related to
the embodiments of the invention. It is obvious that the described
embodiments are just a part but not all of the embodiments of the
invention. Based on the described embodiments herein, those skilled
in the art can obtain other embodiment(s), without any inventive
work, which should be within the scope of the invention.
A First Embodiment
[0013] FIG. 2 shows a cross-sectional structural view of a frame
portion of a liquid crystal display device according to a first
embodiment of the present invention. As shown in FIG. 2, the liquid
crystal display device according to the first embodiment of the
present invention comprises: an upper substrate 12, comprising: a
substrate 1; a color filter 2, formed on a surface of the substrate
I facing a lower substrate 13; and a black matrix 3 formed in the
same layer with the color filter 2; the lower substrate 13,
cell-assembled with the upper substrate 12, and comprising: a base
substrate 11; a gate metal bus 10, a gate insulating layer 9, a
source/drain metal bus 8 and a first insulating protection layer 7
which are formed on the base substrate 11 sequentially; a
transparent electrode 6, formed on the first insulating protection
layer 7; and a second insulating protection layer 5, covering the
transparent electrode 6 and extending to a periphery of a display
area of the liquid crystal display device; and a seal agent 4,
provided at the periphery of the display area of the liquid crystal
display device, wherein a upper portion of the seal agent 4 is
attached to the substrate 1 and a lower portion thereof is attached
to the second insulating protection layer 5, and a first through
hole 91 passing through the gate insulating layer 9 and the first
insulating protection layer 7 is provided above the gate metal bus
10 to expose a part of the gate metal bus 10, a second through hole
71 passing through the first insulating protection layer 7 is
provided above the source/drain metal bus 8 to expose a part of the
source/drain metal bus 8, and the transparent electrode 6 connects
the gate metal bus 10 and the source/drain metal bus 8 through the
first through hole 91 and the second through hole 71.
[0014] Illustratively, the lower substrate 13 is an array
substrate, and the base substrate 11 is a base substrate of the
array substrate, for example, a glass substrate, and the upper
substrate 12 is a color filter substrate, and the substrate 1 is a
base substrate of the color filter substrate, for example, a glass
substrate.
[0015] Illustratively, the seal agent herein can use an ultraviolet
curing seal agent, and by providing a reflector below the base
substrate 11, and by irradiating an ultraviolet light from an upper
substrate 12 side, a cured seal agent 4 can be formed.
[0016] Illustratively, coating and curing the seal agent can be
performed by using a seal agent coating device comprising an
ultraviolet irradiating member, thus when sprayed out from a nozzle
of the seal agent coating device, the seal agent can be irradiated
to be pre-cured, and then the possibility that the seal agent
reacts with liquid crystal molecules during subsequent seal agent
curing is lowered.
[0017] Compared with a current liquid crystal display device in
FIG. 1, it can be seen that the liquid crystal display device
according to the present embodiment can effectively avoid a risk
that the seal agent 4 erodes the transparent electrode 6 by adding
the second insulating protection layer 5; meanwhile, due to the
arrangement of the second insulating protection layer 5, the seal
agent 4 can get close to the display area as much as possible,
which helps narrow a frame of the liquid crystal display device;
further, the lower portion of the seal agent 4 is directly attached
to the second insulating protection layer 5, which reduces a height
of the seal agent 4, favors curing the seal agent 4 and lowers the
possibility that the seal agent 4 pollutes the liquid crystal
molecules.
[0018] The embodiment of the present invention only describes and
illustrates the frame portion of the liquid crystal display device,
and structures of the other portions of the liquid crystal display
device can use the common structures in the art, and, for
simplicity, are not described herein.
A Second Embodiment
[0019] A second embodiment of the present invention provides a
manufacturing method of the liquid crystal display device according
to the first embodiment of the present invention. Herein, the
manufacturing of a frame portion of the liquid crystal display
device is mainly described, and the other portions of the liquid
crystal display device can be manufactured by using any
conventional method, which are not detailed herein for
simplicity.
[0020] The manufacturing method of the liquid crystal display
device according to the second embodiment of the present invention
comprises following steps:
[0021] Step A: sequentially forming a gate metal bus, a gate
insulating layer, a source/drain metal bus and a first insulating
protection layer on a base substrate, wherein, the gate metal bus
and the source/drain metal bus are formed by respectively
depositing a gate metal layer and a source/drain metal layer,
coating a photoresist, exposing, developing, etching and stripping,
the gate insulating layer and the first insulating protection layer
can be formed by depositing insulating material using, for example,
a chemical vapor deposition method, and specific process parameters
and methods are the same as a conventional manufacturing process of
the liquid crystal display device, which are not described herein
for simplicity, wherein a first through hole passing through the
gate insulating layer and the first insulating protection layer is
formed above the gate metal bus to expose a part of the gate metal
bus.
[0022] Step B: on the base substrate obtained after the step A,
forming a second through hole above the source/drain metal bus,
which penetrates through the first insulating protection layer to
expose a part of the source/drain metal bus .
[0023] Step C: on the base substrate obtained after the step B,
forming a transparent electrode connecting the gate metal bus and
the source/drain metal bus through the first through hole and the
second through hole above the first insulating protection layer,
wherein, the transparent electrode is formed by depositing a
transparent electrode layer, coating a photoresist, exposing and
developing the photoresist, etching and stripping, and specific
process parameters and methods are the same as a conventional
manufacturing process of the liquid crystal display device, which
are not described herein for simplicity.
[0024] Step D: forming a second insulating protection layer on the
base substrate obtained after the step C which covers the
transparent electrode and extends to the periphery of a display
region of the liquid crystal display device, so that obtaining a
lower substrate.
[0025] Illustratively, the step D comprises following steps:
[0026] Step D1: using a conventional depositing process, for
example, a chemical vapor deposition process, to sequentially
deposit insulating material and a photoresist over the first
insulating protection layer and the transparent electrode; and
[0027] Step D2: using an ultraviolet light mask to expose the
photoresist on the insulating material, and developing the
photoresist;
[0028] Illustratively, FIG. 3 shows a plan view of the ultraviolet
light mask used to form the transparent electrode in the
manufacturing method of the liquid crystal display device according
to the second embodiment of the present invention, and as shown in
FIG. 3, the ultraviolet light mask comprises: an light-blocking
region comprising a sub-mask 101 corresponding to a Data Pad
region, a sub-mask 102 corresponding to a Gate Pad region and a
sub-mask 103 corresponding to the display region; and a
light-transmitting region comprising a region 200 corresponding to
the second insulating protection layer to be formed and a region
300 corresponding to the seal agent. Illustratively, ultraviolet
light is usually used to expose and develop the photoresist coated
on the insulating material.
[0029] D3: under protection of the exposed and developed
photoresist, etching the insulating material to form the second
insulating protection layer.
[0030] D4: removing a residual photoresist.
[0031] Step E: using a seal agent to adhere an upper substrate
comprising a color filter and a black matrix at the same layer and
the second insulating protection layer, and using the ultraviolet
light mask to irradiate and cure the seal agent.
[0032] Illustratively, the step E comprises following steps:
[0033] E1: coating the seal agent at the periphery of the display
area of the liquid crystal display device so that it adheres the
upper substrate and the second insulating protection layer; and
[0034] E2: using the ultraviolet light mask to irradiate and cure
the seal agent.
[0035] Illustratively, coating and curing the seal agent can be
performed by using a seal agent coating device comprising an
ultraviolet irradiating member, thus when sprayed out from a nozzle
of the seal agent coating device, the seal agent can be irradiated
to be pre-cured, and thus the possibility that the seal agent
reacts with liquid crystal molecules during subsequent seal agent
curing is lowered.
[0036] Illustratively, the seal agent herein can use an ultraviolet
curing seal agent, and by providing a reflector below the base
substrate, and by irradiating ultraviolet light from an upper
substrate side, a cured seal agent 4 can be formed.
[0037] Referring to FIG. 3, the region 200 of the ultraviolet light
mask corresponding to the second insulating protection layer is a
light-transmitting region which comprises the region 300
corresponding to the seal agent, thus, the ultraviolet light mask
can also be used during curing the seal agent. That is to say, the
method of the present embodiment manufactures the second insulating
protection layer at the periphery of the liquid crystal display
device without adding the number of the mask.
[0038] With the liquid crystal display device and the manufacturing
method thereof according to the embodiments of the present
invention, by providing the second insulating protection layer
above the transparent electrode of the liquid crystal display
device which extends to the periphery of the display region, the
metal electrode can be effectively prevented from being eroded by
the seal agent, so that the seal agent can get close to the display
region as much as possible, which thus helps narrow a frame of the
liquid crystal display device; meanwhile, a height of the seal
agent is lowered, so that it can be easily cured and the
possibility of polluting the liquid crystal molecules is lowered.
Further, the mask for forming the second insulating protection
layer and the mask for curing the seal agent are the same mask, and
thus, the number of the mask is not increased.
[0039] It should be understood by those skilled in the art that
various changes and modifications may be made in these embodiments
without departing from the scope and spirit of the present
invention. If these changes and modifications fall into the range
of the claims and their equivalents, the present invention also is
directed to include these changes and modifications.
* * * * *