U.S. patent application number 12/146452 was filed with the patent office on 2008-11-20 for liquid crystal display panel and liquid crystal display module.
This patent application is currently assigned to Chunghwa Picture Tubes, LTD.. Invention is credited to Hsien-Chang Hsiao, Cheng-Chung Hu.
Application Number | 20080284952 12/146452 |
Document ID | / |
Family ID | 36315925 |
Filed Date | 2008-11-20 |
United States Patent
Application |
20080284952 |
Kind Code |
A1 |
Hu; Cheng-Chung ; et
al. |
November 20, 2008 |
LIQUID CRYSTAL DISPLAY PANEL AND LIQUID CRYSTAL DISPLAY MODULE
Abstract
A liquid crystal display (LCD) panel and module is provided. The
LCD panel includes a thin film transistor (TFT) array substrate, a
color filter substrate, a liquid crystal layer, an upper polarizing
plate and a lower polarizing plate. The color filter substrate is
disposed over the TFT array substrate, and the liquid crystal layer
is disposed between the TFT array substrate and the color filter
substrate. In addition, the upper polarizing plate is disposed over
the color filter substrate. Moreover, the lower polarizing plate is
disposed over the TFT array substrate, and the lower polarizing
plate includes, for example, a polarizer and a light scattering
layer disposed over a surface of the polarizer.
Inventors: |
Hu; Cheng-Chung; (Taoyuan
County, TW) ; Hsiao; Hsien-Chang; (Nantou County,
TW) |
Correspondence
Address: |
JIANQ CHYUN INTELLECTUAL PROPERTY OFFICE
7 FLOOR-1, NO. 100, ROOSEVELT ROAD, SECTION 2
TAIPEI
100
TW
|
Assignee: |
Chunghwa Picture Tubes,
LTD.
Taipei
TW
|
Family ID: |
36315925 |
Appl. No.: |
12/146452 |
Filed: |
June 26, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
10904402 |
Nov 9, 2004 |
7411641 |
|
|
12146452 |
|
|
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Current U.S.
Class: |
349/96 |
Current CPC
Class: |
G02F 1/133504 20130101;
G02F 1/133528 20130101 |
Class at
Publication: |
349/96 |
International
Class: |
G02F 1/1335 20060101
G02F001/1335 |
Claims
1. A liquid crystal display (LCD) panel, comprising: a thin film
transistor (TFT) array substrate; a color filter substrate,
disposed over the TFT array substrate; a liquid crystal layer,
disposed between the TFT array substrate and the color filter
substrate; an upper polarizing plate, disposed over the color
filter substrate; and a lower polarizing plate, disposed over the
TFT array substrate, the lower polarizing plate comprising: a
polarizer; a first light scattering layer disposed over a surface
of the polarizer, the first light scattering layer comprising an
adhesion material and a plurality of light scattering particles
distributed in the adhesion material; an optical film; and an
adhesion layer, wherein the adhesion layer is coated on another
surface of the polarizer, and the optical film is adhered over the
adhesion layer.
2. The LCD panel of claim 1, wherein the optical film comprises a
brightness enhancement film (BEF) or a dual brightness enhanced
film (DBEF).
3. The LCD panel of claim 1, wherein the upper polarizing plate
comprises glare type polarizing plate.
4. A liquid crystal display (LCD) module, comprising: a back light
module, comprising at least an optical film and a back light
source; and a liquid crystal display (LCD) panel, disposed over the
back light module, wherein the LCD panel comprising: a thin film
transistor (TFT) array substrate; a color filter substrate,
disposed over the TFT array substrate; a liquid crystal layer,
disposed between the TFT array substrate and the color filter
substrate; an upper polarizing plate, disposed over the color
filter substrate; and a lower polarizing plate, disposed over the
TFT array substrate, wherein the lower polarizing plate comprises:
a polarizer; a first light scattering layer disposed over a surface
of the polarizer, wherein the first light scattering layer
comprises an adhesion material and a plurality of light scattering
particles distributed in the adhesion material; an optical film;
and an adhesion layer, wherein the adhesion layer is coated on
another surface of the polarizer, and the optical film is adhered
over the adhesion layer.
5. The LCD module of claim 4, the optical film comprises a
brightness enhancement film (BEF) or a dual brightness enhanced
film (DBEF).
6. The LCD module of claim 4, wherein the upper polarizing plate
comprises glare type polarizing plate.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a divisional of an application Ser. No.
10/904,402, filed on Nov. 9, 2004. The entirety of each of the
above-mentioned patent applications is hereby incorporated by
reference herein and made a part of this specification.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention generally relates to a display panel.
More particularly, the present invention relates to a liquid
crystal display panel and a liquid crystal display module.
[0004] 2. Description of Related Art
[0005] Recently, a variety of factories have invested great efforts
on the development of display device as the market demand of
display device has grown rapidly. Conventionally, since the cathode
ray tube (CRT) is fully developed and has good display quality, the
CRT has been adopted in a variety of application. However, the CRT
has the disadvantages of high power consumption, heavy weight,
large size and harmful radiation and therefore cannot meet the
requirement of environmental protection requirement. Accordingly,
the thin film transistor liquid crystal display (TFT-LCD) has been
developed and has become the major trend of the display device due
to the advantages of high definition, small size, thinness, low
power consumption, radiation free, etc.
[0006] The conventional TFT-LCD module mainly includes a liquid
crystal display (LCD) panel and a back light module. The liquid
crystal display panel constitutes a TFT array substrate, a color
filter substrate and a liquid crystal layer disposed between the
two substrates. The back light module is adopted as a surface light
source of the LCD panel for displaying image from the TFT-LCD
module. In addition, an upper polarizing plate and a lower
polarizing plate are usually disposed over the two opposite
surfaces of the LCD panel to enhance the display quality of the
TFT-LCD module. Moreover, a plurality of optical films is disposed
between the LCD panel and the surface light source of the back
light module to enhance the brightness of the TFT-LCD module.
[0007] Accordingly, in order to enhance the display contrast of the
LCD panel and to make the appearance of the LCD panel more shiny,
the upper polarizing plate of the LCD panel is generally
constructed by glare type polarizing plate, and the lower
polarizing plate of the LCD panel is generally constructed by
conventional polarizing plate. However, after a light from the
surface light source of the back light module passes through the
optical films and the LCD panel, generally a plurality of mutually
parallelized moire are generated in the display area of the LCD
panel. It is noted that, since the moire may be observed by human
eyes, the displaying quality of the LCD panel is reduced.
SUMMARY OF THE INVENTION
[0008] Accordingly, the present invention is directed to liquid
crystal display (LCD) panel for reducing the generation of moire in
the display area of the LCD panel and thereby enhance the
displaying quality of the LCD panel.
[0009] In addition, the present invention is also directed to a
liquid crystal display (LCD) module for reducing the generation of
moire in the display area of the LCD module and thereby enhance the
displaying quality of the LCD module.
[0010] According to one embodiment of the present invention, a
liquid crystal display panel comprising, for example but not
limited to, a thin film transistor (TFT) array substrate, a color
filter substrate, a liquid crystal layer, an upper polarizing plate
and a lower polarizing plate is provided. The color filter
substrate is disposed over the TFT array substrate. The liquid
crystal layer is disposed between the TFT array substrate and the
color filter substrate. In addition, the upper polarizing plate is
disposed over the color filter substrate. Moreover, the lower
polarizing plate is disposed over the TFT array substrate. The
lower polarizing plate comprises, for example but not limited to, a
polarizer and a light scattering layer disposed over a surface of
the polarizer.
[0011] According to one embodiment of the present invention, a
liquid crystal display module comprising, for example but not
limited to, a back light module and a liquid crystal display panel
is provided. The liquid crystal display panel is disposed over the
back light module. In addition, the back light module comprises,
for example, an optical film (or an optical sheet) and a back light
source. Moreover, the liquid crystal display panel comprises, for
example but not limited to, a thin film transistor (TFT) array
substrate, a color filter substrate, a liquid crystal layer, an
upper polarizing plate and a lower polarizing plate. The color
filter substrate is disposed over the TFT array substrate, and the
liquid crystal layer is disposed between the TFT array substrate
and the color filter substrate. The upper polarizing plate is
disposed over the color filter substrate, and the lower polarizing
plate is disposed over the TFT array substrate. Furthermore, the
lower polarizing plate comprises, for example but not limited to, a
polarizer and a light scattering layer disposed over a surface of
the polarizer.
[0012] Accordingly, a lower polarizing plate with light scattering
layer is provided in the liquid crystal display panel and liquid
crystal display module of the present invention. Therefore, the
generation of moire in the display area can be effectively reduced
by the light scattering layer, and thus the displaying quality of
the liquid crystal display panel and liquid crystal display module
is enhanced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The accompanying drawings are included to provide a further
understanding of the present invention, and are incorporated in and
constitute a part of this specification. The drawings illustrate
embodiments of the present invention and, together with the
description, serve to explain the principles of the present
invention.
[0014] FIG. 1 is a schematic cross-sectional view illustrating a
liquid crystal display module according to one embodiment of the
present invention.
[0015] FIG. 2A, FIG. 2B, FIG. 2C and FIG. 2D are schematic
cross-section views illustrating lower polarizing plates according
to another embodiments of the present invention.
DESCRIPTION OF THE EMBODIMENTS
[0016] The present invention will be described fully hereinafter
with reference to the accompanying drawings, in which preferred
embodiments of the present invention are illustrated. The present
invention may, however, be embodied in many 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 invention to those skilled in the art. Like numbers
refer to like elements in the accompanying drawings throughout.
[0017] FIG. 1 is a schematic cross-section view illustrating a
liquid crystal display module according to one embodiment of the
present invention. Referring to FIG. 1, the liquid crystal display
(LCD) module 10 comprises, for example but not limited to, a back
light module 100 and a liquid crystal display (LCD) panel 200. The
LCD panel 200 is disposed over the back light module 100. In
addition, the back light module 100 comprises, for example, a back
light source 110 and an optical film (or optical sheet) 120. In one
embodiment of the present invention, the optical film 120
comprises, for example but not limited to, a light collecting sheet
122 and a diffusion sheet 124. The light collecting sheet 122
comprises, for example but not limited to, a prism sheet.
Furthermore, the back light source 110 comprises, for example but
not limited to, a side type back light source or a direct type back
light source.
[0018] Moreover, the LCD panel 200 comprises, for example but not
limited to, a thin film transistor (TFT) array substrate 210, a
color filter substrate 220, a liquid crystal layer 230, an upper
polarizing plate 240 and a lower polarizing plate 250. The color
filter substrate 220 is disposed over the TFT array substrate 210.
The liquid crystal layer 230 is disposed between the TFT array
substrate 210 and the color filter substrate 220. Furthermore, the
upper polarizing plate 240 is disposed over a surface of the color
filter substrate 220, and the lower polarizing plate 250 is
disposed over a surface of the TFT array substrate 210.
[0019] Referring to the enlarged area of FIG. 1, the lower
polarizing plate 250 comprises, for example but not limited to, a
polarizer 252 and a light scattering layer 254. The light
scattering layer 254 is constructed by, for example but not limited
to, a transparent resin 254b and a plurality of light scattering
particles 254a distributed in transparent resin 254b. In addition,
the transparent resin 254b comprises, for example but not limited
to, ultraviolet (UV) light hardening resin or other light hardening
resin. Moreover, the refractive indices of the light scattering
particle 254a and the transparent resin 254b are, for example,
different. The light scattering particle 254a comprises, for
example but not limited to, transparent particles only with a
single refractive index. Alternatively, the light scattering
particle 254a may comprise transparent particles with a plurality
of different refractive indices. Furthermore, the lower polarizing
plate 250 is, for example but not limited to, adhered over the TFT
array substrate 210 via an adhesion layer 256. However, in another
embodiment of the present invention, the lower polarizing plate 250
may be disposed over the TFT array substrate 210 by using another
method except for by using the adhesion layer 256.
[0020] Referring to FIG. 1, in the present invention, the light
scattering particles 254a disposed in the light scattering layer
254 of the lower polarizing plate 250 is provided for scattering
the light from the surface light source of the back light source
110. Therefore, in comparison with the conventional technology,
after the light from the surface light source of the back light
source 110 passes through the optical film sheet 120, it is
difficult to generate moire in the LCD panel 200. Therefore, the
user will not observe moire in the display area of the LCD panel
200. In the present invention, the upper polarizing plate 240
comprises conventional polarizing plate or any applicable
polarizing plate. In one embodiment of the present invention, in
order to make the appearances of the LCD panel 200 and the LCD
module 10 more shiny and to enhance the display contrasts of the
LCD panel 200 and the LCD module 10, the upper polarizing plate 140
comprises, for example, glare type polarizing plate. Furthermore,
the surface treatment of the glare type polarizing plate comprises
hardening and antireflection treatment.
[0021] It is noted that in the embodiment described above, the
lower polarizing plate of the LCD panel and the LCD module
comprises the polarizing plate having the light scattering layer.
Therefore, the generation of moire in the LCD module is effectively
reduced. Hereinafter, a lower polarizing plate of the LCD panel and
the LCD module for achieving the effect reducing the generation of
moire will be described.
[0022] FIG. 2A is schematic cross-section view illustrating a lower
polarizing plate according to another embodiment of the present
invention. Referring to FIG. 2A, the lower polarizing plate 350 is
also adhered over a surface of the thin film transistor (TFT) array
substrate 210 (as illustrated in FIG. 1). In the present
embodiment, the lower polarizing plate 350 comprises, for example
but not limited to, a polarizer 252, a light scattering layer 354
and an optical film 358. The light scattering layer 354 is adhered
over a surface of the polarizer 252. The light scattering layer 354
is constructed by, for example but not limited to, an adhesion
material 354b and a plurality of light scattering particles 354a
distributed in the adhesion material 354b. The optical film 358 is
adhered over a surface of the polarizer 252 via the adhesion
material 354b of the light scattering layer 354. In one embodiment
of the present invention, the optical film 358 comprises, for
example but not limited to, a brightness enhancement film (BEF) or
a dual brightness enhanced film (DBEF). In addition, an adhesion
layer 256 may be further coated on another surface of the polarizer
252 to adhere the lower polarizing plate 350 over the surface of
the TFT array substrate 210 (similar to that illustrated in FIG.
1).
[0023] In another embodiment of the present invention, the lower
polarizing plate may be designed as shown in FIG. 2B. The lower
polarizing plate 450 comprises, for example but not limited to, a
polarizer 252, a light scattering layer 454, an optical film 358
and an adhesion layer 256. The light scattering layer 454 is
adhered over a surface of the polarizer 252. The light scattering
layer 454 is constructed by, for example but not limited to, an
adhesion material 454b and a plurality of light scattering
particles 454a distributed in the adhesion material 454b. Moreover,
the adhesion layer 256 is coated on another surface of the
polarizer 252. The optical film 358 is adhered over the polarizer
252 via the adhesion layer 256. The lower polarizing plate 450 is,
for example but not limited to, adhered over the surface of the TFT
array substrate 210 via the adhesion material 454b of the light
scattering layer 454 (similar to that illustrated in FIG. 1).
[0024] In another embodiment of the present invention, the lower
polarizing plate comprises two light scattering layers as shown in
FIG. 2C. In the present embodiment, the lower polarizing plate 550
comprises, for example but not limited to, a polarizer 252, a light
scattering layer 454, a light scattering layer 554 and an optical
film 358. The light scattering layer 554 is adhered over a surface
of the polarizer 252. The light scattering layer 554 is constructed
by, for example but not limited to, an adhesion material 554b and a
plurality of light scattering particles 554a distributed in the
adhesion material 554b. The optical film 358 is adhered over the
surface of the polarizer 252 via the adhesion material 554b of the
light scattering layer 554. In addition, the light scattering layer
454 is adhered over another surface of the polarizer 252. The light
scattering layer 454 is constructed by, for example but not limited
to, an adhesion material 454b and a plurality of light scattering
particles 454a distributed in the adhesion material 454b. The lower
polarizing plate 550 is, for example but not limited to, adhered
over the surface of the TFT array substrate 210 via the adhesion
material 454b of the light scattering layer 454 (similar to that
illustrated in FIG. 1).
[0025] In another embodiment of the present invention, the lower
polarizing plate may be designed as shown in FIG. 2D. In the
present invention, the lower polarizing plate 650 comprises, for
example but not limited to, a polarizer 252 and a light scattering
layer 454. The light scattering layer 454 is adhered over a surface
of the polarizer 252. The light scattering layer 454 is constructed
by, for example but not limited to, an adhesion material 454b and a
plurality of light scattering particles 454a distributed in the
adhesion material 454b. The lower polarizing plate 650 is, for
example but not limited to, adhered over the surface of the TFT
array substrate 210 via the adhesion material 454b of the light
scattering layer 454 (similar to that illustrated in FIG. 1).
[0026] Accordingly, the LCD panel and the LCD module of the present
invention have the following advantages.
[0027] First, since the lower polarizing plate of the LCD panel and
the LCD module of the present invention have a light scattering
layer, the generation of moire in the LCD module can be effectively
reduced. Therefore, the display quality of the LCD panel and the
LCD module of the present invention is enhanced.
[0028] In addition, it is noted that the light scattering layer of
the lower polarizing plate is constructed by, for example but not
limited to, adhesion material and light scattering particles.
Therefore, the light scattering layer may not only be provided for
adhesion, but also may enhance the display quality of the LCD panel
and the LCD module of the present invention.
[0029] Furthermore, in the LCD panel and the LCD module of the
present invention, the lower polarizing plate further comprises
optical film layer for enhancing the displaying quality. Moreover,
the light scattering layer constructed by the adhesion material can
be disposed between the optical film layer and the polarizer. In
addition, the upper polarizing plate may also comprises glare type
polarizing plate to make the appearance of the LCD panel and the
LCD module more shiny.
[0030] The foregoing description of the preferred embodiment of the
present invention has been presented for purposes of illustration
and description. It is not intended to be exhaustive or to limit
the invention to the precise form or to exemplary embodiments
disclosed. Accordingly, the foregoing description should be
regarded as illustrative rather than restrictive. Obviously, many
modifications and variations will be apparent to practitioners
skilled in this art. The embodiments are chosen and described in
order to best explain the principles of the invention and its best
mode practical application, thereby to enable persons skilled in
the art to understand the invention for various embodiments and
with various modifications as are suited to the particular use or
implementation contemplated. It is intended that the scope of the
invention be defined by the claims appended hereto and their
equivalents in which all terms are meant in their broadest
reasonable sense unless otherwise indicated. It should be
appreciated that variations may be made in the embodiments
described by persons skilled in the art without departing from the
scope of the present invention as defined by the following claims.
Moreover, no element and component in the present disclosure is
intended to be dedicated to the public regardless of whether the
element or component is explicitly recited in the following
claims.
* * * * *