U.S. patent application number 17/104587 was filed with the patent office on 2022-05-26 for electronic device.
The applicant listed for this patent is InnoLux Corporation. Invention is credited to Kazuto JITSUI.
Application Number | 20220163828 17/104587 |
Document ID | / |
Family ID | |
Filed Date | 2022-05-26 |
United States Patent
Application |
20220163828 |
Kind Code |
A1 |
JITSUI; Kazuto |
May 26, 2022 |
ELECTRONIC DEVICE
Abstract
An electronic device includes: a display cell; a first light
adjusting unit; and a second light adjusting unit, wherein the
display cell, the first light adjusting unit and the second light
adjusting unit are at least partially overlapped, and at least one
of the first light adjusting unit and the second light adjusting
unit is an ECB mode liquid crystal cell.
Inventors: |
JITSUI; Kazuto; (Miao-Li
County, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
InnoLux Corporation |
Miao-Li County |
|
TW |
|
|
Appl. No.: |
17/104587 |
Filed: |
November 25, 2020 |
International
Class: |
G02F 1/13 20060101
G02F001/13; G02F 1/139 20060101 G02F001/139; G02F 1/1335 20060101
G02F001/1335; G02F 1/1347 20060101 G02F001/1347; F21V 8/00 20060101
F21V008/00; G02F 1/1343 20060101 G02F001/1343; G02F 1/1368 20060101
G02F001/1368 |
Claims
1. An electronic device, comprising: a display cell; a first light
adjusting unit; and a second light adjusting unit, wherein the
display cell, the first light adjusting unit and the second light
adjusting unit are at least partially overlapped, the display cell
directly contacts the second light adjusting unit, and at least one
of the first light adjusting unit and the second light adjusting
unit is an ECB mode liquid crystal cell.
2. The electronic device of claim 1, comprising a first polarizer
and a second polarizer, wherein the display cell and the second
light adjusting unit are disposed between the first polarizer and
the second polarizer.
3. The electronic device of claim 2, wherein the second light
adjusting unit is disposed on the display cell.
4. The electronic device of claim 2, comprising a third polarizer,
wherein the first light adjusting unit is disposed between the
second polarizer and the third polarizer.
5. The display device of claim 1, wherein the second light
adjusting unit is an ECB mode liquid crystal cell.
6. The electronic device of claim 1, wherein the first light
adjusting unit is an ECB mode liquid crystal cell, a TN mode liquid
crystal cell, a VA mode liquid crystal cell, or a VA-ECB hybrid
mode liquid crystal cell.
7. The display device of claim 1, wherein the first light adjusting
unit comprises: a collimated backlight module; and an active
diffuser disposed on the collimated backlight module, wherein the
display cell is disposed on the active diffuser.
8. The display device of claim 1, wherein the first light adjusting
unit comprises: a collimated backlight module; and a transparent
backlight module disposed on the collimated backlight module,
wherein the display cell is disposed on the transparent backlight
module.
9. The display device of claim 8, wherein the transparent backlight
module comprises a light guide plate, and plural cavities or air
bubbles are formed or embedded in the light guide plate.
10. The display device of claim 1, wherein the first light
adjusting unit comprises: a non-collimated backlight module; a
louver film disposed on the non-collimated backlight module; and an
active diffuser disposed on the louver film, wherein the display
cell is disposed on the active diffuser.
11. The display device of claim 1, wherein the first light
adjusting unit comprises: a non-collimated backlight module; a
louver film disposed on the non-collimated backlight module; and a
transparent backlight module disposed on the louver film, wherein
the display cell is disposed on the transparent backlight
module.
12. The display device of claim 1, wherein the first light
adjusting unit comprises: a non-collimated backlight module; a
transparent backlight module disposed on the non-collimated
backlight module, wherein the display cell is disposed on the
transparent backlight module.
13. The electronic device of claim 1, wherein the first light
adjusting unit comprises a first viewing angle changing area and a
first dummy area, and the second light adjusting unit comprises a
second viewing angle changing area and a second dummy area; wherein
the first viewing angle changing area corresponds to the second
viewing angle changing area, and the first dummy area corresponds
to the second dummy area.
14. An electronic device, comprising: a backlight module; a first
light adjusting unit; and a second light adjusting unit disposed
between the first light adjusting unit and the backlight module,
wherein the second light adjusting unit comprises plural pixels,
wherein at least one of the plural pixels comprises a display
region and a viewing angle changing region, and an operation mode
of the display region is different from an operation mode of the
viewing angle changing region.
15. The electronic device of claim 14, wherein the display region
is operated by an IPS mode.
16. The electronic device of claim 14, wherein the viewing angle
changing region is operated by an ECB mode.
17. The electronic device of claim 14, wherein an alignment of
liquid crystal molecules in the display region are controlled by a
first transistor, and an alignment of liquid crystal molecules in
the viewing angle changing region are controlled by a second
transistor.
18. The electronic device of claim 14, further comprising a first
polarizer and a second polarizer, wherein the second light
adjusting unit is disposed between the first polarizer and the
second polarizer.
19. The electronic device of claim 18, further comprising a third
polarizer, wherein the first light adjusting unit is disposed
between the second polarizer and the third polarizer.
20. The display device of claim 14, wherein the first light
adjusting unit is an ECB mode liquid crystal cell, a TN mode liquid
crystal cell, a VA mode liquid crystal cell, or a VA-ECB hybrid
mode liquid crystal cell.
Description
BACKGROUND
1. Field
[0001] The present disclosure relates to an electronic device. More
specifically, the present disclosure relates to a privacy
electronic device.
2. Description of Related Art
[0002] Recently, a privacy display device is developed for several
usages, such as automotive displays, Notebook displays, PC
monitors, ATM displays, etc. Requirement of the privacy display
device depends on the product. In addition, some privacy display
devices are required to have the function of switching between the
wide mode (i.e. the public mode) and the narrow mode (i.e. the
privacy mode).
[0003] However, the currently used privacy display devices have
some disadvantages. For example, the brightness of the display
devices at the wide viewing angle is not low enough, and other
people near to the user may feel annoyed.
[0004] Therefore, it is desirable to provide a novel privacy
electronic device to improve the disadvantages of the privacy
display devices currently used.
SUMMARY
[0005] The present disclosure provides an electronic device,
comprising: a display cell; a first light adjusting unit; and a
second light adjusting unit, wherein the display cell, the first
light adjusting unit and the second light adjusting unit are at
least partially overlapped, and at least one of the first light
adjusting unit and the second light adjusting unit is an ECB mode
liquid crystal cell.
[0006] The present disclosure further provides another electronic
device, comprising: a first light adjusting unit; and a second
light adjusting unit comprising plural pixels, wherein at least one
of the plural pixels comprises a display region and a viewing angle
changing region, and an operation mode of the display region is
different from an operation mode of the viewing angle changing
region.
[0007] Other novel features of the disclosure will become more
apparent from the following detailed description when taken in
conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a schematic cross-sectional view of an electronic
device according to one embodiment of the present disclosure.
[0009] FIG. 2A is a schematic cross-sectional view of a display
cell and a second light adjusting unit of an electronic device
shown in FIG. 1 in a wide mode.
[0010] FIG. 2B is a schematic cross-sectional view of a display
cell and a second light adjusting unit of an electronic device
shown in FIG. 1 in a narrow mode.
[0011] FIG. 3 is a schematic cross-sectional view of an electronic
device according to another embodiment of the present
disclosure.
[0012] FIG. 4A is a schematic top view of a pixel of an electronic
device of FIG. 3.
[0013] FIG. 4B is a schematic cross-sectional view of a second
light adjusting unit of an electronic device shown in FIG. 3 in a
wide mode.
[0014] FIG. 4C is a schematic cross-sectional view of a second
light adjusting unit of an electronic device shown in FIG. 3 in a
narrow mode.
[0015] FIG. 5 is a circuit diagram of pixels of a second light
adjusting unit shown in FIG. 3 in one embodiment of the present
disclosure.
[0016] FIG. 6 is a circuit diagram of a pixel of a second light
adjusting unit shown in FIG. 3 in another embodiment of the present
disclosure.
[0017] FIG. 7 is a circuit diagram of a pixel of a second light
adjusting unit shown in FIG. 3 in further another embodiment of the
present disclosure.
[0018] FIG. 8 is a schematic cross-sectional view of an electronic
device according to another embodiment of the present
disclosure.
[0019] FIG. 9 is a schematic cross-sectional view of an electronic
device according to further another embodiment of the present
disclosure.
[0020] FIG. 10 is a schematic cross-sectional view of an electronic
device according to further another embodiment of the present
disclosure.
[0021] FIG. 11 is a schematic cross-sectional view of an electronic
device according to further another embodiment of the present
disclosure.
[0022] FIG. 12 is a schematic cross-sectional view of an electronic
device according to further another embodiment of the present
disclosure.
[0023] FIG. 13 is a schematic cross-sectional view of an electronic
device according to further another embodiment of the present
disclosure.
DETAILED DESCRIPTION OF EMBODIMENT
[0024] Different embodiments of the present disclosure are provided
in the following description. These embodiments are meant to
explain the technical content of the present disclosure, but not
meant to limit the scope of the present disclosure. A feature
described in an embodiment may be applied to other embodiments by
suitable modification, substitution, combination, or
separation.
[0025] It should be noted that, in the present specification, when
a component is described to comprise an element, it means that the
component may comprise one or more of the elements, and it does not
mean that the component has only one of the element, except
otherwise specified.
[0026] Moreover, in the present specification, the ordinal numbers,
such as "first" or "second", are used to distinguish a plurality of
elements having the same name, and it does not means that there is
essentially a level, a rank, an executing order, or an
manufacturing order among the elements, except otherwise specified.
A "first" element and a "second" element may exist together in the
same component, or alternatively, they may exist in different
components, respectively. The existence of an element described by
a greater ordinal number does not essentially means the existence
of another element described by a smaller ordinal number.
[0027] In the present specification, except otherwise specified,
the feature A "or" or "and/or" the feature B means the existence of
the feature A, the existence of the feature B, or the existence of
both the features A and B. The feature A "and" the feature B means
the existence of both the features A and B. The term "comprise(s)",
"comprising", "include(s)", "including", "have", "has" and "having"
means "comprise(s)/comprising but is/are/being not limited to".
[0028] Moreover, in the present specification, the terms, such as
"top", "upper", "bottom", "front", "back", or "middle", as well as
the terms, such as "on", "above", "over", "under", "below", or
"between", are used to describe the relative positions among a
plurality of elements, and the described relative positions may be
interpreted to include their translation, rotation, or
reflection.
[0029] Furthermore, the terms recited in the specification and the
claims such as "above", "over", or "on" are intended not only
directly contact with the other element, but also intended
indirectly contact with the other element. Similarly, the terms
recited in the specification and the claims such as "below", or
"under" are intended not only directly contact with the other
element but also intended indirectly contact with the other
element.
[0030] Furthermore, the terms recited in the specification and the
claims such as "connect" is intended not only directly connect with
other element, but also intended indirectly connect and
electrically connect with other element.
[0031] Furthermore, when a value is in a range from a first value
to a second value, the value may be the first value, the second
value, or another value between the first value and the second
value.
[0032] Moreover, in the present specification, a value may be
interpreted to cover a range within .+-.20% of the value, and in
particular, a range within .+-.10%, .+-.5%, .+-.3%, .+-.2%, .+-.1%
or .+-.0.5% of the value, except otherwise specified. The value
provided in the present specification is an approximate value,
which means the meaning "about" is also included in the present
disclosure without specifically specifying "about".
[0033] In the present specification, except otherwise specified,
the terms (including technical and scientific terms) used herein
have the meanings generally known by a person skilled in the art.
It should be noted that, except otherwise specified in the
embodiments of the present disclosure, these terms (for example,
the terms defined in the generally used dictionary) should have the
meanings identical to those known in the art, the background of the
present disclosure or the context of the present specification, and
should not be read by an ideal or over-formal way.
[0034] Hereinafter, the term "narrow mode" refers to the privacy
mode, and the images displayed on the electronic device may be seen
within, for example, 25 degrees of the viewing angle, and the
ranges within .+-.10 degrees or .+-.5 degrees of 25 degrees are
also included in the scope of the present disclosure. The term
"wide mode" refers to the public mode, and the images displayed on
the electronic device may be seen within, for example, near to 90
degrees (for example, 80 degrees) of the viewing angle. The term
"low contrast ratio (CR)" means a function that the contrast ratio
is ranged from 0.2 to 5. The term "dark" means a function that the
brightness of the electronic device is 2% of the maximum brightness
of grayscale.
[0035] The term "viewing angle" can be defined by the followings. A
direction perpendicular to a surface of a side of the electronic
device near to the user (i.e. the display side) is defined. A first
virtual line is defined, which is substantially parallel to the
direction and is a line connecting the eyes of the user and the
center (or a point close to the center within a tolerable
deviation; or a point which is on the central line of the display
side, wherein the central line may be substantially parallel to one
side edge of the display side) of the display side of the
electronic device. When the user moves (for example, along a moving
direction parallel to the display side), a second virtual line is
defined, which is a line connecting the center (or a point close to
the center within a tolerable deviation) of the display side of the
electronic device and the position of the eyes of the user that the
user still can see the images displayed by the electronic device.
The angle included between the first virtual line and the second
virtual line is defined as the viewing angle.
[0036] The electronic device of the present disclosure may comprise
a display device, an antenna device, a sensing device, a touch
device, a curved electronic device or a free shape display device,
but the present disclosure is not limited thereto. The electronic
device of the present disclosure may be a bendable or a flexible
display device. The display device may include, for example, a
tiled display device, but the present disclosure is not limited
thereto. The electronic device of the present disclosure may be a
combination of the aforesaid devices, but the present disclosure is
not limited thereto. In addition, the shapes of the electronic
device of the present disclosure is not particularly limited, and
may be rectangle, circular, polygon, a shape with curved edges or
other suitable shapes, but the present disclosure is not limited
thereto. The electronic device of the present disclosure may
comprise a driving system, a control system, a light source system,
a shelving system or other peripheral system to support the display
device or the tiled display device. Hereinafter, a display device
is used as an example to illustrate the electronic device of the
present disclosure, but the present disclosure is not limited
thereto.
[0037] FIG. 1 is a schematic cross-sectional view of an electronic
device according to one embodiment of the present disclosure. The
electronic device of the present embodiment comprises: a display
cell 11; a first light adjusting unit 12; and a second light
adjusting unit 13, wherein the display cell 11, the first light
adjusting unit 12 and the second light adjusting unit 13 are at
least partially overlapped.
[0038] Herein, the display cell 11 is for displaying images. In an
embodiment, the display cell 11 may be a liquid crystal cell, but
the present disclosure is not limited thereto. In detail, the
display cell 11 may include two substrates, liquid crystal, plural
pixels and a color filter, wherein the liquid crystal, plural
pixels and the color filter are disposed between the two
substrates. The driving mode of the liquid crystal of display cell
11 is not particularly limited. For example, the driving mode of
the liquid crystal may be an in-plane switching (IPS) mode, a
fringe field switching (FFS) mode, a vertical alignment (VA) mode,
a twisted nematic (TN) mode, an electrically-controlled
birefringence (ECB) mode or an optically compensated birefringence
(OCB) mode; but the present disclosure is not limited thereto. In
some embodiments, the display cell 11 may be a self-luminance
display cell, including plural pixels which may produce different
colors. For example, the plural pixels may include an organic light
emitting diode (OLED), an inorganic light emitting diode (ILED), a
mini-LED, a micro-LED, quantum dots (QDs), a quantum dot diode
(QLED/QDLED), an electrophoresis, fluorescence, phosphor, other
suitable materials or a combination of the above materials, but the
disclosure is not limited thereto.
[0039] In addition, at least one of the first light adjusting unit
12 and the second light adjusting unit 13 is an ECB mode liquid
crystal cell. In some embodiments, the first light adjusting unit
12 may be an ECB mode liquid crystal cell, a TN mode liquid crystal
cell, a VA mode liquid crystal cell, or a VA-ECB hybrid mode liquid
crystal cell.
[0040] Furthermore, the second light adjusting unit 13 may be an
ECB mode liquid crystal cell.
[0041] The electronic device of the present embodiment comprises: a
first polarizer 15 and a second polarizer 16, wherein the display
cell 11 and the second light adjusting unit 13 are disposed between
the first polarizer 15 and the second polarizer 16, and the second
light adjusting unit 13 is disposed on the display cell 11.
Thereby, the relative position of the first polarizer 15, the
second polarizer 16, the second light adjusting unit 13 and the
display cell 11 described above may have the a low CR (contrast
ratio) function. In some embodiments, the amount and the positions
of the polarizers may be adjusted according to the need. In
addition, other optical films such as prism sheets, diffusors or
bright enhancement films may also be included in the electronic
device of the present disclosure if it is needed.
[0042] The electronic device of the present embodiment further
comprises: a third polarizer 17, wherein the first light adjusting
unit 12 is disposed between the second polarizer 16 and the third
polarizer 17. Herein, the relative position of the first polarizer
15, the second polarizer 16, the third polarizer 17, the display
cell 11, the first light adjusting unit 12 and the second light
adjusting unit 13 is shown as FIG. 1, thereby the electronic device
may have the low contrast ratio function and dark function at the
same time in the narrow mode. In another embodiment of the present
disclosure, two different polarizers may be used as the second
polarizers, one is disposed on and adjacent to the second light
adjusting unit 13 and the other one is disposed under and adjacent
to the first light adjusting unit 12. In this embodiment, relative
position of the one polarizer mentioned above, the second light
adjusting unit 13, the display cell 11 and the first polarizer 15
may have the low contrast ratio function in the narrow mode. The
relative position of the other one polarizer mentioned above, the
first light adjusting unit 12 and the third polarizer 17 may have
dark function in the narrow mode, but the present disclosure is not
limit thereto.
[0043] For the dark function, in the wide mode, no liquid crystal
retardation is occurred at all viewing angle, so the image
displayed by the display cell 11 can be seen from all viewing
angle. In the narrow mode, no or little liquid crystal retardation
is occurred at the on-axis or at the user viewing angle (for
example, within 25 degrees), but significant liquid crystal
retardation is occurred at the off-axis or at the viewing angle
outside the user viewing angle (for example, more than 25 degrees).
Thus, the image displayed by the display cell 11 can be seen from
the user viewing angle but cannot be seen from the viewing angle
outside the user viewing angle.
[0044] In the electronic device of the present embodiment, the
first polarizer 15, the second polarizer 16 and the third polarizer
17 may respectively be any retardation film, for example, an
A-plate, a C-plate, an O-film a discotic LC film, or a combination
thereof; but the present disclosure is not limited thereto. In
addition, the first polarizer 15, the second polarizer 16 and the
third polarizer 17 may be the same or different from each
other.
[0045] As mentioned above, the electronic device of the present
embodiment of the present embodiment is a combination of the low CR
function and the dark function. In the case that the electronic
device is in the narrow mode, the images displayed by the display
cell 11 can be visible at user viewing angle (for example, within
25 degrees); but the images displayed by the display cell 11 is
invisible at the narrow viewing angle (for example, in a range from
25 degrees to 40 degrees) due to the low CR and also invisible at
the wide viewing angle (for example, in a range from 40 degrees to
80 degrees) due to the low CR and enough darkness. In particular,
the brightness of the electronic device at the wide viewing angle
is low, so a person near to the user may not be disturbed when the
electronic device is in the narrow mode. The ranges within .+-.5
degrees or .+-.10 degrees of the viewing angles described herein
are still included in the scope of the present disclosure due to
the design or the process error of the electronic device.
[0046] The electronic device of the present embodiment has both the
dark function and the low CR function, so the brightness at the
viewing angle outside the user viewing angle is low enough when the
electronic device is in the narrow mode. Thus, a person adjacent to
the user cannot see the images displayed on the electronic device,
or the person is not disturbed by the electronic device due to the
insufficient darkness.
[0047] As shown in FIG. 1, in the electronic device of the present
embodiment, the second light adjusting unit 13 is disposed on the
display cell 11, the first light adjusting unit 12 is disposed on
the second light adjusting unit 13, the second light adjusting unit
13 and the display cell 11 is disposed between the first polarizer
15 and the second polarizer 16 and the first light adjusting unit
12 disposed between the second polarizer 16 and the third polarizer
17.
[0048] In another embodiment of the present disclosure, the second
light adjusting unit 13 and the display cell 11 may be disposed
between the second polarizer 16 and the third polarizer 17, and the
second light adjusting unit 13 is disposed on the display cell 11.
The first light adjusting unit 12 is disposed between the first
polarizer 15 and the second polarizer 16. Hence, the second light
adjusting unit 13 and the display cell 11 are disposed on the first
light adjusting unit 12. Thereby, the relative position of the
second polarizer 16, the display cell 11, the second light
adjusting unit 13 and the third polarizer 17 may have the low CR
function. The relative position of the first polarizer 15, the
second polarizer 16, the third polarizer 17, the display cell 11,
the first light adjusting unit 12 and the second light adjusting
unit 13 described in this embodiment may have the low contrast
ratio function and dark function at the same time in the narrow
mode. However, the present disclosure is not limited thereto.
[0049] Furthermore, the electronic device of the present embodiment
may further selectively comprise a backlight module 14, disposed
under the display cell 11, the first light adjusting unit 12 and
the second light adjusting unit 13. In some embodiments, the
backlight module 14 may be a direct-lit backlight module or an
edge-lit backlight module, but the present disclosure is not
limited thereto.
[0050] FIG. 2A and FIG. 2B are respectively schematic
cross-sectional views of the display cell and the second light
adjusting unit shown in FIG. 1 in a wide mode and in a narrow mode.
Herein, for example, the driving mode of the liquid crystal of the
display cell 11 may be an IPS mode. However, the present disclosure
is not limited thereto, and any driving mode of the liquid crystal
may be used in the present disclosure. In addition, the second
light adjusting unit 13 may be used an ECB mode.
[0051] As shown in FIG. 2A and FIG. 2B, the display cell 11
comprises: a first substrate 111; a second substrate 116 opposite
to the first substrate 111; a common electrode 112 disposed on the
first substrate 111; an insulating layer 113 disposed on the common
electrode 112; a pixel electrode 114 disposed on the insulating
layer 113; and a first display medium layer 115 disposed between
the first substrate 111 and the second substrate 116. Herein,
plural transistors (not shown in the figure) electrically connected
to the pixel electrode 114 are disposed on the first substrate 111.
The common electrode 112 may be a planer electrode, and the pixel
electrode 114 may be a patterned electrode, but the present
disclosure is not limited thereto. Even not shown in the figure, in
some embodiments, the display cell 11 may selectively comprise a
color filter layer and a black matrix layer respectively formed on
the first substrate 111 or the second substrate 116. In addition,
the first display medium layer 115 may be a liquid crystal layer,
but the present disclosure is not limited thereto.
[0052] The second light adjusting unit 13 comprises: a third
substrate 131; a fourth substrate 135 opposite to the third
substrate 131; a first electrode 132 disposed on the third
substrate 131; a second electrode 134 disposed on the fourth
substrate 135; and a second display medium layer 133 disposed
between the third substrate 131 and the fourth substrate 135. The
first electrode 132 and the second electrode 134 may be
respectively a planer electrode, but the present disclosure is not
limited thereto. In some embodiment, the second display medium
layer 133 may be a liquid crystal layer, but the present disclosure
is not limited thereto. In addition, an alignment layer may be
disposed between the second display medium layer 133 and the second
electrode 134; and another alignment layer may be disposed between
the second display medium layer 133 and the first electrode
132.
[0053] As shown in FIG. 2A, when the electronic device is in a wide
mode, there is no voltage difference between the first electrode
132 and the second electrode 134. For example, in one embodiment,
no voltage is applied to the first electrode 132 and the second
electrode 134. In another embodiment, same voltage is applied to
the first electrode 132 and the second electrode 134. However, the
present disclosure is not limited thereto. As shown in FIG. 2B,
when the electronic device is in a narrow mode, there is a voltage
difference between the first electrode 132 and the second electrode
134. In one embodiment, no voltage is applied to the first
electrode 132 and a predetermined voltage is applied to the second
electrode 134. In another embodiment, a predetermined voltage is
applied to the first electrode 132 and no voltage is applied to the
second electrode 134. In further another embodiment, different
voltage is applied to the first electrode 132 and the second
electrode 134. However, the present disclosure is not limited
thereto. Herein, the voltage difference may cause the liquid
crystal molecules in the display medium layer 133 rotates, the
rotation of the liquid crystal molecules may not influence the
brightness of the second light adjusting unit 13 at the user
viewing angle (for example, within 25 degrees) but causes the
brightness increased at the narrow viewing angle (for example, in a
range from 25 degrees to 40 degrees) and wide viewing angle (for
example, in a range from 40 degrees to 80 degrees). Thus, the
purpose of low CR at the narrow viewing angle and wide viewing
angles can be achieved.
[0054] FIG. 3 is a schematic cross-sectional view of an electronic
device according to another embodiment of the present disclosure,
and FIG. 4A is a schematic top view of a pixel of an electronic
device of FIG. 3. The electronic device of the present embodiment
comprises: a first light adjusting unit 12; and a second light
adjusting unit 13' comprising plural pixels P, wherein at least one
of the plural pixels P comprises a display region R1 and a viewing
angle changing region R2, and an operation mode of the display
region R1 is different from an operation mode of the viewing angle
changing region R2. The difference between the electronic devices
shown in FIG. 1 and FIG. 3 is that the electronic device of FIG. 1
comprises the display cell 11 and the second light adjusting unit
13, but the electronic device of FIG. 3 comprises the second light
adjusting unit 13' with pixels P. Thus, the second light adjusting
unit 13' of the present embodiment can be considered as a display
cell with light adjusting function.
[0055] The electronic device of the present embodiment further
comprises: a first polarizer 15 and a second polarizer 16, wherein
the second light adjusting unit 13' is disposed between the first
polarizer 15 and the second polarizer 16.
[0056] The electronic device of the present embodiment further
comprises: a third polarizer 17, wherein the first light adjusting
unit 12 is disposed between the second polarizer 16 and the third
polarizer 17.
[0057] Furthermore, the electronic device of the present embodiment
may further selectively comprise a backlight module 14, disposed
under the first light adjusting unit 12 and the second light
adjusting unit 13'. In some embodiments, the backlight module 14
may be a direct-lit backlight module or an edge-lit backlight
module, but the present disclosure is not limited thereto.
[0058] The first polarizer 15, the second polarizer 16, the third
polarizer 17 and the backlight module 14 are similar to those
illustrated above, and are not repeated again.
[0059] As shown in FIG. 4A, the liquid crystal molecules in the
display region R1 may be driven by an IPS mode, and liquid crystal
molecules in the viewing angle changing region R2 may be driven by
an ECB mode. In another embodiment of the present disclosure,
self-luminance display medium may be used in the display region R1.
However, the present disclosure is not limited thereto. FIG. 4B and
FIG. 4C are respectively cross-sectional views of the second light
adjusting unit 13' shown in FIG. 3 in a wide mode and in a narrow
mode.
[0060] As shown in FIG. 4A to FIG. 4C, the second light adjusting
unit 13' comprises: a first substrate 111; a second substrate 116
opposite to the first substrate 111; a common electrode 112
disposed on the first substrate 111; an insulating layer 113
disposed on the common electrode 112; a pixel electrode 114
disposed on the insulating layer 113; and a first display medium
layer 115 disposed between the first substrate 111 and the second
substrate 116. Herein, the pixel electrode 114 is disposed in the
display region R1 of the pixel P, but is not disposed in the
viewing angle changing region R2 of the pixel P. Herein, plural
transistors (not shown in the figure) electrically connected to the
pixel electrode 114 are disposed on the first substrate 111. The
common electrode 112 is a planer electrode, and the pixel electrode
114 is a patterned electrode. Even not shown in the figure, in some
embodiments, the display cell 11 may selectively comprise a color
filter layer and a black matrix layer respectively formed on the
first substrate 111 or the second substrate 116. In addition, the
first display medium layer 115 may be a liquid crystal layer, but
the present disclosure is not limited thereto. In some embodiments,
the shape or design of the pixel electrode 114 can be adjusted
according to actual needs, not limited to FIG. 4A.
[0061] The second light adjusting unit 13' further comprises: a
first electrode 132 disposed on the insulating layer 113, wherein
the pixel electrode 114 and the first electrode 132 may be formed
by the same layer; and a second electrode 134 disposed on the
second substrate 116, wherein the first display medium layer 115 is
disposed between the first electrode 132 and the second electrode
134. Herein, the first electrode 132 and the second electrode 134
are disposed in the viewing angle changing region R2 of the pixel
P, but are not disposed in the display region R1 of the pixel P.
The first electrode 132 and the second electrode 134 may be
respectively a planer electrode, but the present disclosure is not
limited thereto.
[0062] In addition, an alignment layer is disposed between the
pixel electrode 114 and the first display medium layer 115, and
also between the first electrode 132 and the first display medium
layer 115. Another alignment layer is disposed between the second
electrode 134 and the first display medium layer 115. The rubbing
direction of the alignment layer on the pixel electrode 114 and the
first electrode 132 is homogeneous. The rubbing direction of the
alignment layer on the pixel electrode 114 and the first electrode
132 is different from (for example, opposite to) the rubbing
direction of the alignment layer on the second electrode 134.
[0063] As shown in FIG. 4B, when the electronic device is in the
wide mode, there is no voltage difference between the first
electrode 132 and the second electrode 134. For example, no voltage
is applied to the first electrode 132 and the second electrode 134,
but the present disclosure is not limited thereto. Thus, the
viewing angle changing region R2 is dark at all viewing angle, and
the image displayed by the display region R1 can be observed by
anyone at all viewing angle. As shown in FIG. 4C, when the
electronic device is in the narrow mode, there is a voltage
difference between the first electrode 132 and the second electrode
134. For example, no voltage is applied to the second electrode 134
and a predetermined voltage is applied to the first electrode 132,
but the present disclosure is not limited thereto. Herein, the
voltage difference may cause the liquid crystal molecules in the
first display medium layer 115 rotates, the rotation of the liquid
crystal molecules may not influence the brightness of the viewing
angle changing region R2 of the second light adjusting unit 13' at
the user viewing angle (for example, within 25 degrees) but causes
the brightness of the viewing angle changing region R2 increased at
the narrow viewing angle (for example, in a range from 25 degrees
to 40 degrees) and wide viewing angle (for example, in a range from
40 degrees to 80 degrees). Thus, the image displayed by the display
region R1 may be observed by the user at the user viewing angle but
may not be observed by a person at the narrow and wide viewing
angles due to low CR.
[0064] Herein, the relative position of the first polarizer 15, the
second polarizer 16, the third polarizer 17, the first light
adjusting unit 12 and the second light adjusting unit 13' is shown
as FIG. 3, thereby the electronic device may have the low contrast
ratio function and dark function at the same time in the narrow
mode.
[0065] FIG. 5 is a circuit diagram of pixels of a second light
adjusting unit shown in FIG. 3 in one embodiment of the present
disclosure. As shown in FIG. 4B and FIG. 5, a voltage source 18 is
electrically connected to the first electrode 132 or the second
electrode 134 in the viewing angle changing region R2. In the wide
mode, the voltage source 18 does not provide a voltage to the first
electrode 132 or the second electrode 134. Thus, in the wide mode,
the viewing angle changing region R2 is dark at all viewing angle.
In the narrow mode, the voltage source 18 provides a predetermined
voltage to the first electrode 132 or the second electrode 134.
Thus, in the narrow mode, the viewing angle changing region R2 is
in a bright state and the purpose of low CR can be achieved.
Herein, in the narrow mode, the CR of the second light adjusting
unit 13' can be calculated by the following equation (I), wherein
R1 means the display region R1 and R2 means the viewing angle
changing region R2:
CR=(Brightness of R1 in the bright state+Brightness of R2 in the
bright state)/(Brightness of R1 in the dark state+Brightness of R2
in the bright state) (I).
[0066] In addition, as shown in FIG. 5, at least one TFT is
disposed in the display region R1, wherein a control end of the TFT
is electrically connected to a first scan line S1, a first end of
the TFT is electrically connected to a first data line D1, and a
second end of the TFT is electrically connected to the capacitor
C.sub.L1 of the first display medium layer 115 which is in the
display region R1. A first end of a storage capacitor C.sub.S1 is
electrically connected to a first end of the capacitor C.sub.L1,
and a second end of the storage capacitor C.sub.S1 and a second end
of the capacitor C.sub.L2 are connected to the ground. Furthermore,
in the viewing angle changing region R2, an end of the capacitor
C.sub.L2 of the first display medium layer 115 (or the capacitor
between first electrode 132 and the second electrode 134) is
electrically connected to the voltage source 18, and another end of
the capacitor C.sub.L2 is connected to the ground.
[0067] FIG. 6 is a circuit diagram of pixels of a second light
adjusting unit shown in FIG. 3 in one embodiment of the present
disclosure. As shown in FIG. 4B and FIG. 6, an alignment of liquid
crystal molecules in the display region R1 are controlled by a
first transistor TFT1, and an alignment of liquid crystal molecules
in the viewing angle changing region R2 are controlled by a second
transistor TFT2. More specifically, the second light adjusting unit
13' (as shown in FIG. 3) further comprises a first scan line S1, a
first data line D1, a second scan line S2 and a second data line
D2, the first transistor TFT1 is electrically connected to the
first scan line S1 and the first data line D1, and the second
transistor TFT2 is electrically connected to the second scan line
S2 and the second data line D2. Thus, the brightness of the display
region R1 and the viewing angle changing region R2 are respectively
controlled by the first transistor TFT1 and the second transistor
TFT2. As shown in FIG. 4B and FIG. 6, the capacitor C.sub.L1 of the
first display medium layer 115 is electrically connected to the
first transistor TFT1, and the capacitor C.sub.L2 of the first
display medium layer 115 (or the capacitor between first electrode
132 and the second electrode 134) is electrically connected to the
second transistor TFT2.
[0068] In the wide mode, no voltage is provided to the first
electrode 132 and/or the second electrode 134. Thus, in the wide
mode, the viewing angle changing region R2 is dark at all viewing
angle. In the narrow mode, a predetermined voltage is provided to
the first electrode 132 or the second electrode 134, so a voltage
difference may be formed between the first electrode 132 and the
second electrode 134 and the viewing angle changing region R2 is in
the bright state. Thus, the purpose of low CR in the narrow mode
can be achieved, and the CR can be close to 0.2 to 5. Herein, in
the narrow mode, the CR of the second light adjusting unit 13' can
be calculated by the following equation (II), wherein R1 means the
display region R1 and R2 means the viewing angle changing region
R2:
CR=(Brightness of R1 in the bright state+Brightness of R2 in the
dark state)/(Brightness of R1 in the dark state+Brightness of R2 in
the bright state) (II).
[0069] FIG. 7 is a circuit diagram of pixels of a second light
adjusting unit shown in FIG. 3 in one embodiment of the present
disclosure. The circuit diagram shown in FIG. 7 is similar to that
shown in FIG. 6, except for the following difference. In FIG. 6,
the second transistor TFT2 is electrically connected to the second
scan line S2 and the second data line D2. In FIG. 7, the second
light adjusting unit 13' (as shown in FIG. 3) further comprises a
first scan line S1, a first data line D1 and a second scan line S2,
the first transistor TFT1 is electrically connected to the first
scan line S1 and the first data line D1, and the second transistor
TFT2 is electrically connected to the second scan line S2 and the
first data line D1. As shown in FIG. 4B and FIG. 7, the capacitor
C.sub.L1 of the first display medium layer 115 is electrically
connected to the first transistor TFT1, and the capacitor C.sub.L2
of the first display medium layer 115 (or the capacitor between
first electrode 132 and the second electrode 134) is electrically
connected to the second transistor TFT2.
[0070] Furthermore, as shown in FIG. 4B and FIG. 7, a voltage
source 18 is further electrically connected to an end of capacitor
C.sub.L2 (for example, first electrode 132 or the second electrode
134) in the viewing angle changing region R2. Thus, the brightness
of the viewing angle changing region R2 is controlled by the second
transistor TFT2 and the voltage source 18.
[0071] As shown in FIG. 4B and FIG. 7, in the wide mode, no voltage
is provided to the first electrode 132 and/or the second electrode
134 and the voltage source 18 does not provide a voltage, so there
is no voltage difference between the first electrode 132 and the
second electrode 134. Thus, in the wide mode, the viewing angle
changing region R2 is dark at all viewing angle. In the narrow
mode, when the display region R1 is in the dark state, no voltage
is provided to the first electrode 132 and/or the second electrode
134 and the voltage source 18 provides a predetermined voltage, so
there is a voltage difference between the first electrode 132 and
the second electrode 134 and the viewing angle changing region R2
is in the bright state. In the narrow mode, when the display region
R1 is in the bright state, the voltage source 18 provides the
predetermined voltage and the same predetermined voltage is
provided to the first electrode 132 and/or the second electrode
134, so there is no voltage difference between the first electrode
132 and the second electrode 134 and the viewing angle changing
region R2 is in the dark state. Thus, the purpose of low CR in the
narrow mode can be achieved, and the CR can be close to 0.2 to 5.
Herein, in the narrow mode, the CR of the second light adjusting
unit 13' can be calculated by the following equation (III), wherein
R1 means the display region R1 and R2 means the viewing angle
changing region R2:
CR=(Brightness of R1 in the bright state+Brightness of R2 in the
dark state)/(Brightness of R1 in the dark state+Brightness of R2 in
the bright state) (II).
[0072] In FIG. 5 to FIG. 7, the voltage provided to the second
transistor TFT2 and/or the voltage provided by the voltage source
18 is not particularly limited, and can be adjusted according to
the brightness of the display region R1. For example, the voltage
provided to the second transistor TFT2 and/or the voltage provided
by the voltage source 18 can be adjusted to make the brightness of
the display region R1 in the bright state similar to or the same as
the brightness of the viewing angle changing region R2 in the
bright state. Thus, the purpose of low CR or CR close to 0.2 to 5
can be achieved.
[0073] As shown in FIG. 3, in the electronic device of the present
embodiment, the first light adjusting unit 12 is disposed on the
second light adjusting unit 13', the second light adjusting unit
13' is disposed between the first polarizer 15 and the second
polarizer 16, and the first light adjusting unit 12 disposed
between the second polarizer 16 and the third polarizer 17. In
another embodiment of the present disclosure, the second light
adjusting unit 13' may be disposed between the second polarizer 16
and the third polarizer 17, and the first light adjusting unit 12
may be disposed between the first polarizer 15 and the second
polarizer 16; thus, the second light adjusting unit 13' may be
disposed on the first light adjusting unit 12. However, the present
disclosure is not limited thereto.
[0074] As shown in FIGS. 2A, 2B, 4B and 4C, the first substrate
111, the second substrate 116, the third substrate 131 and the
fourth substrate 135 may respectively be a non-flexible substrate,
a flexible substrate, a thin film or a combination thereof. The
material thereof may respectively include quartz, glass, silicon
wafer, sapphire, polycarbonate (PC), polyimide (PI), polypropylene
(PP), polyethylene terephthalate (PET) or other plastic or polymer
material, or a combination thereof, but the present disclosure is
not limited thereto. When the first substrate 111, the second
substrate 116, the third substrate 131 or the fourth substrate 135
is a thin film, which may be a water barrier film or an
encapsulating water barrier film formed by laminated
inorganic-organic-inorganic (I-O-I) insulating layers. In some
embodiment, the materials of the first substrate 111, the second
substrate 116, the third substrate 131 and the fourth substrate 135
may be the same or different; but the present disclosure is not
limited thereto.
[0075] The material of the common electrode 112, the pixel
electrode 114, the first electrode 132 and the second electrode 134
may respectively include a transparent conductive metal oxide such
as ITO (indium tin oxide), IZO (indium zinc oxide), ITZO (indium
tin zinc oxide), IGZO (indium gallium zinc oxide), AZO (aluminum
zinc oxide) or a combination thereof; but the present disclosure is
not limited thereto.
[0076] The insulating layer 113 may include organic material or
inorganic material, for example, silicon oxide, silicon oxynitride,
silicon nitride, aluminum oxide, resin, polymer, photoresist, or a
combination thereof; but the present disclosure is not limited
thereto.
[0077] FIG. 8 is a schematic cross-sectional view of an electronic
device according to another embodiment of the present disclosure.
The electronic device of the present embodiment is similar to that
shown in FIG. 1, except for the following differences.
[0078] As shown in FIG. 8, the second light adjusting unit 13 and
the display cell 11 is disposed between the first polarizer 15 and
the second polarizer 16, the first light adjusting unit 12 disposed
between the second polarizer 16 and the third polarizer 17, the
second light adjusting unit 13 is disposed on the display cell 11,
and the first light adjusting unit 12 can be disposed below the
display cell 11. In addition, the first light adjusting unit 12
comprises a first viewing angle changing area 12a and a first dummy
area 12b, and the second light adjusting unit 13 comprises a second
viewing angle changing area 13a and a second dummy area 13b. The
first viewing angle changing area 12a corresponds to the second
viewing angle changing area 13a, and in particular, the second
viewing angle changing area 13a the first viewing angle changing
area 12a are overlapped. The first dummy area 12b corresponds to
the second dummy area 13b, and in particular, the second dummy area
13b overlaps the first dummy area 12b.
[0079] Herein, the region with the first dummy area 12b and the
second dummy area 13b is in the wide mode, no matter the region
with the first viewing angle changing area 12a and the second
viewing angle changing area 13a is in the narrow mode or in the
wide mode. Herein, the first dummy area 12b of the first light
adjusting unit 12 or the second dummy area 13b of the second light
adjusting unit 13 may respectively disposed with or without
electrodes. In one embodiment of the present disclosure, the first
dummy area 12b of the first light adjusting unit 12 and the second
dummy area 13b of the second light adjusting unit 13 are disposed
with the electrodes to maintain the transmittance of the region
with the first dummy area 12b and the second dummy area 13b, but
the present disclosure is not limited thereto.
[0080] Even not shown in FIG. 1, the first light adjusting unit 12
and the second light adjusting unit 13 may also comprise the first
viewing angle changing area 12a and the first dummy area 12b, the
second viewing angle changing area 13a and the second dummy area
13b mentioned above.
[0081] FIG. 9 is a schematic cross-sectional view of an electronic
device according to further another embodiment of the present
disclosure. The electronic device of the present embodiment
comprises: a display cell 11; a first light adjusting unit 12; and
a second light adjusting unit 13, wherein the display cell 11, the
first light adjusting unit 12 and the second light adjusting unit
13 are at least partially overlapped. The electronic device of the
present embodiment further comprises: a first polarizer 15 and a
second polarizer 16, wherein the display cell 11 and the second
light adjusting unit 13 are disposed between the first polarizer 15
and the second polarizer 16.
[0082] As shown in FIG. 9, in the present embodiment, the first
light adjusting unit 12 comprises a collimated backlight module 141
and an active diffuser 142 disposed on the collimated backlight
module 141, and the display cell 11 is disposed on the active
diffuser 142.
[0083] In the present embodiment, the collimated backlight module
141 may be a direct-lit backlight module or an edge-lit backlight
module. The collimated backlight module 141 may comprise a prism
sheet or a louver film to make the light emitting from the
collimated backlight module 141 have narrow light dispersion. The
beam angle of the collimate light may be, for example, within
.+-.40 degrees, .+-.30 degrees or .+-.20 degrees from a normal
direction of the display cell 11, but the present disclosure is not
limited thereto.
[0084] In addition, the active diffuser 142 used herein refers to a
diffuser that the haze thereof can be adjusted. Example of the
active diffuser 142 may include a polymer dispersed liquid crystal
(PDLC) film or a polymer network liquid crystal (PNLC) film. In the
wide mode, the active diffuser 142 is adjusted to have high haze,
and the active diffuser 142 is in a diffusing state. In the narrow
mode, the active diffuser 142 is adjusted to have low haze (for
example, close to 0%), and the active diffuser 142 is in a
transparent state.
[0085] FIG. 10 is a cross-sectional view of an electronic device
according to further another embodiment of the present disclosure.
The electronic device of the present embodiment is similar to that
shown in FIG. 9, except for the first light adjusting unit 12. In
the present embodiment, the first light adjusting unit 12
comprises: a non-collimated backlight module 14; a louver film 143
disposed on the non-collimated backlight module 14; and an active
diffuser 142 disposed on the louver film 143, wherein the display
cell 11 is disposed on the active diffuser 142. The active diffuser
142 used herein is similar to that illustrated above.
[0086] The non-collimated backlight module 14 may be a direct-lit
backlight module or an edge-lit backlight module. The difference
between the non-collimated backlight module 14 and the collimated
backlight module 141 is that, the collimated backlight module 141
has narrow light dispersion, but the non-collimated backlight
module 14 has wide light dispersion. The beam angle of the light
emitting from the non-collimated backlight module 14 may be, for
example, within .+-.90 degrees, .+-.80 degrees or .+-.70 degrees
from a normal direction of the display cell 11, but the present
disclosure is not limited thereto. By using the louver film 143,
the light emitting from the non-collimated backlight module 14 can
be converted into collimate light.
[0087] FIG. 11 is a cross-sectional view of an electronic device
according to further another embodiment of the present disclosure.
The electronic device of the present embodiment is similar to that
shown in FIG. 9, except for the first light adjusting unit 12. In
the present embodiment, the first light adjusting unit 12 comprises
a collimated backlight module 141 and a transparent backlight
module 144 disposed on the collimated backlight module 141, and the
display cell 11 is disposed on the transparent backlight module
144. Herein, the transparent backlight module 144 has wide light
dispersion, and the beam angle of the light emitting from the
transparent backlight module 144 may be, for example, within .+-.90
degrees, .+-.80 degrees or .+-.70 degrees from a normal direction
of the display cell 11.
[0088] The structure of the transparent backlight module 144 can be
similar to the non-collimated backlight module. For example, the
transparent backlight module 144 may comprise a light guide plate,
and plural cavities or air bubbles are formed or embedded in the
light guide plate. Because the refractive index of the cavities or
the air bubbles is different from the refractive index of the
material of the light guide plate, so the light incident into the
light guide plate may be refracted, reflected or scattered. Thus
the purpose of wide viewing angle can be achieved. Herein, the
shapes or the sizes of the cavities or the air bubbles are not
particularly limited, and may be adjusted according to the
need.
[0089] As shown in FIG. 11, in the wide mode, the collimated
backlight module 141 is in the off-state and the transparent
backlight module 144 is in the on-state. In the narrow mode, the
collimated backlight module 141 is in the on-state and the
transparent backlight module 144 is in the off-state.
[0090] FIG. 12 is a cross-sectional view of an electronic device
according to further another embodiment of the present disclosure.
The electronic device of the present embodiment is similar to that
shown in FIG. 11, except for the first light adjusting unit 12. In
the present embodiment, the first light adjusting unit 12
comprises: a non-collimated backlight module 14; a louver film 143
disposed on the non-collimated backlight module 14; and a
transparent backlight module 144 disposed on the louver film 143,
wherein the display cell 11 is disposed on the transparent
backlight module 144. Herein, the transparent backlight module 144
has wide light dispersion.
[0091] The non-collimated backlight module 14, the louver film 143
and the transparent backlight module 144 with wide light dispersion
are similar to those stated above, and the descriptions thereof are
not repeated again.
[0092] As shown in FIG. 12, in the wide mode, the non-collimated
backlight module 14 is in an off-state and the transparent
backlight module 144 is in an on-state. In the narrow mode, the
non-collimated backlight module 14 is in an on-state and the
transparent backlight module 144 is in an off-state.
[0093] FIG. 13 is a cross-sectional view of an electronic device
according to further another embodiment of the present disclosure.
The electronic device of the present embodiment is similar to that
shown in FIG. 11, except for the first light adjusting unit 12. In
the present embodiment, the first light adjusting unit 12
comprises: a non-collimated backlight module 14; and a transparent
backlight module 144' disposed on the non-collimated backlight
module 14, wherein the display cell 11 is disposed on the
transparent backlight module 144'. Herein, the transparent
backlight module 144' has narrow light dispersion, and the beam
angle of the light emitting from the transparent backlight module
144 may be, for example, within .+-.40 degrees, .+-.30 degrees or
.+-.20 degrees from a normal direction of the display cell 11.
[0094] As shown in FIG. 13, in the wide mode, the non-collimated
backlight module 14 is in the on-state, and the transparent
backlight module 144' is in the off-state. In the narrow mode, the
non-collimated backlight module 14 is in the off-state, and the
transparent backlight module 144 is in the on-state.
[0095] In the electronic devices shown in FIG. 9 to FIG. 13, the
display cell 11, the second light adjusting unit 13, the first
polarizer 15 and the second polarizer 16 are similar to those
stated above, and are not repeated again. In addition, in other
embodiments of the present disclosure, the display cell 11 and the
second light adjusting unit 13 of the electronic devices shown in
FIG. 9 to FIG. 13 together may be replaced by the second light
adjusting unit 13' illustrated above.
[0096] In addition, in other embodiments of the present disclosure,
the first light adjusting unit 12 of the electronic devices shown
in FIG. 9 to FIG. 13 may comprise a first viewing angle changing
area and a first dummy area (not shown in the figure), and the
second light adjusting unit 13 comprises a second viewing angle
changing area 13a and a second dummy area 13b (similar to those
shown in FIG. 8). The first viewing angle changing area corresponds
to the second viewing angle changing area 13a, and in particular,
the second viewing angle changing area 13a overlaps the first
viewing angle changing area. The first dummy area corresponds to
the second dummy area 13b, and in particular, the second dummy area
13b overlaps the first dummy area. Herein, the region with the
first dummy area and the second dummy area 13b is in the wide mode,
no matter the region with the first viewing angle changing area and
the second viewing angle changing area 13a is in the narrow mode or
in the wide mode.
[0097] In the present disclosure, the features in different
embodiments of the present disclosure can be mixed to form another
embodiment without departing from the spirit and scope of the
disclosure as hereinafter claimed.
[0098] Although the present disclosure has been explained in
relation to its embodiment, it is to be understood that many other
possible modifications and variations can be made without departing
from the spirit and scope of the disclosure as hereinafter
claimed.
* * * * *