JP2003215587A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which is made thinner by omitting a diffusion sheet in a backlight without generating interference fringes on a display screen. <P>SOLUTION: The liquid crystal display device is provided with: a liquid crystal display panel including a liquid crystal which is held between a first substrate and a second substrate; and the backlight which is disposed on the surface opposite to the surface facing the liquid crystal in the second substrate and which includes a prism sheet on the uppermost part on the side opposite to the second substrate. The second substrate is provided with a polarizing reflection plate on the surface opposite to the liquid crystal, and a diffusion layer is arranged between the polarizing reflection plate and the prism sheet. The polarizing reflection plate is provided with a support body opposing to the prism sheet and a polarizing reflection layer disposed on the support body. The diffusion layer is arranged on the surface of the support body facing the prism sheet. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used in a personal computer, a workstation, etc., and more particularly to a technique effective in achieving a thin structure.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used as display devices for personal computers, monitors, televisions and the like. This liquid crystal display device includes a pair of substrates, a liquid crystal layer (a layer made of a liquid crystal composition) sealed between the pair of substrates, and a main surface of at least one of the pair of substrates facing the liquid crystal layer. And a liquid crystal display panel having an electrode group formed on. In the display operation of this liquid crystal display device,
The electric field applied to the liquid crystal layer is controlled by the electrode group according to the information to be displayed, and the light transmittance of the liquid crystal layer is modulated. The liquid crystal display device is roughly classified into an active matrix type and a passive matrix type according to the behavior of liquid crystal molecules in the liquid crystal layer in the display operation and the electrode structure in the liquid crystal display panel adapted to the behavior. To be done. The former liquid crystal display device has a feature that an active element is formed in each pixel forming the above-mentioned effective display area.
m Transistor) is also used as an active device. The liquid crystal display panel using this thin film transistor is also called a TFT panel. Liquid crystal display panels belonging to the passive matrix type are, for example, STN (Supe
r Twisted Nematic) method is widely used.

Generally, the liquid crystal display device is used by being incorporated in a personal computer, a monitor, a television or the like. Therefore, the liquid crystal display device is supplied as a "liquid crystal display module" to the assembly process of a personal computer, a monitor, or a television. These liquid crystal display modules are configured by a liquid crystal display panel around which a drive circuit unit is arranged, a backlight that illuminates the liquid crystal display panel, and an upper case that covers the liquid crystal display panel and the backlight. . For example, in a TFT type liquid crystal display module, a filter substrate on which a color filter is formed, a pixel electrode, and a thin film transistor (TF).
The TFT substrate on which T) is formed is superposed so that the surfaces on which the alignment films are formed face each other by the sealing material formed on the peripheral portions of both substrates, and liquid crystal is injected between both substrates.
After sealing, polarizing plates are attached to both surfaces to form a liquid crystal display panel. Generally, a polarizing plate attached to the display surface side of a liquid crystal display panel is called an upper polarizing plate, and a polarizing plate attached to the backlight side of a liquid crystal display panel is called a lower polarizing plate. Note that such a technique is disclosed in, for example, Japanese Patent Laid-Open No.
No. 257142 and the like.

[0004]

The above-mentioned backlight is provided with, for example, light emitted from a light source in the mold.
A light guide for guiding the light away from the light source and for uniformly irradiating the entire liquid crystal display panel with light, and is arranged near the side surface of the light guide along the side surface of the light guide and in parallel with the side surface. A cold cathode fluorescent lamp that is a linear light source, an optical sheet (for example, an upper diffusion sheet, two prism sheets, and a lower diffusion sheet) arranged on the light guide, and a lower side of the light guide. And a reflection sheet that is extendedly arranged. In recent years, notebook personal computers and the like are required to be lighter and thinner, and therefore, liquid crystal display modules are also required to be lighter and thinner. As one of the methods for reducing the thickness of the liquid crystal display module, it is effective to omit the upper diffusion sheet in the optical sheet arranged on the light guide in the backlight described above. However, in the case where the lower polarizing plate has a polarizing reflection plate, if the upper diffusion sheet is omitted, the light reflected by the polarizing reflection plate interferes with the prism sheet, and interference fringes (Newton rings) occur on the display surface. There was a problem.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a liquid crystal display device in a backlight without causing interference fringes on the display surface. It is an object of the present invention to provide a technique that enables the upper diffusion sheet to be omitted, thereby making it possible to make the device thinner. The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0006]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows. That is, the present invention includes a first substrate and a second substrate.
A liquid crystal layer sandwiched between the second substrate and a liquid crystal layer, the liquid crystal display panel having a polarization reflection plate on a surface opposite to the surface of the second substrate facing the liquid crystal; The present invention is applied to a liquid crystal display device including a backlight arranged on the surface opposite to the surface facing the liquid crystal and having a prism sheet on the uppermost side facing the second substrate. The present invention is characterized in that an antireflection layer or a diffusion layer is provided between the polarizing reflection plate and the prism sheet. The polarization reflection plate has a support facing the prism sheet, and a polarization reflection layer provided on the support, and in a preferred embodiment of the present invention, the antireflection layer or the diffusion layer is , Provided on the surface of the support facing the prism sheet. The antireflection layer or the diffusion layer is provided on the surface of the support facing the polarized reflection layer. Further, the diffusion layer is provided in the support.

According to the present invention, the upper polarizing plate of the backlight is omitted, and the antireflection layer or the diffusion layer is provided between the polarizing reflection plate and the prism sheet. The light reflected by does not interfere with the prism sheet, and it is possible to prevent the occurrence of interference fringes on the display surface. As a result, the liquid crystal display device can be made thinner than ever before.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments, the same reference numerals are given to those having the same function, and the repeated description thereof will be omitted. First Embodiment <Basic Configuration of TFT Type Liquid Crystal Display Module to which the Present Invention is Applied> FIG. 1 is an exploded perspective view showing a schematic configuration of a TFT type liquid crystal display module to which the present invention is applied. The liquid crystal display module shown in FIG. 1 is an active matrix type liquid crystal in which its driving element (semiconductor chip) is mounted on one of a pair of substrates that constitute a liquid crystal display panel by a flip chip attachment (FCA) type mounting method. It is a display module. The main components are as follows. The liquid crystal display module shown in FIG. 1 includes a frame-shaped upper case 4 made of a metal plate, a liquid crystal display panel 5, and a backlight. The liquid crystal display panel 5 is shown as an assembled liquid crystal display panel 5 with a drive circuit board, and a pair of substrates (for example, glass or the like having light transmitting property and electrically insulating property) that are stacked with a liquid crystal layer interposed therebetween. Of the material), a plurality of liquid crystal driving semiconductor integrated circuit elements (hereinafter referred to as driving ICs) arranged on the periphery of one of the pair of substrates, and signals to these driving ICs from the outside of the liquid crystal display panel. Alternatively, the flexible circuit board (1, 2) for supplying electric power and the interface circuit board 3 are provided.

The flexible circuit board (1, 2) is an interface circuit board (including an integrated circuit element such as a timing converter) 3 provided on the lower surface of the mold 14.
Is connected to. In the liquid crystal display module shown in FIG. 1, the flexible circuit board 1 is used for a drain drive IC, and the flexible circuit board 2 is used for a gate drive IC. An upper case (also referred to as a shield case, a frame, or a metal frame) 4 made of a metal plate is provided above the assembled liquid crystal display panel 5, and its display window corresponds to the effective display area of the liquid crystal display panel 5. It is arranged so that the main surface to be exposed is exposed. Therefore, the upper case 4
Has a frame-shaped planar structure. Furthermore, above it,
For example, a housing (not shown) provided with a display window of a personal computer or the like is covered. In the example of the personal computer, the user looks into the liquid crystal display panel 5 shown in FIG. 1 from the upper surface side and recognizes the image displayed in the effective display area.

In FIG. 1, below the assembled liquid crystal display panel 5, an optical sheet group (upper diffusion plate 6, two prism sheets (7a, 7a, 7b) and the lower diffuser plate 8) are arranged. As shown in FIG. 1, the optical sheet group includes an upper diffusion plate 6 and a lower diffusion plate 8 above and below two prism sheets 7.
Are arranged and laminated. The optical sheet group is molded (also referred to as a lower case) 14 at one end by a protrusion.
Is fixed to the side wall formed on the peripheral edge of the. In the mold 14, the light guide 9 is housed on the lower surface of the lower diffusion plate 8 so that the upper surface thereof faces, and the reflection sheet 10 is arranged below the light guide 9. The mold 14 is often integrally formed of white synthetic resin or the like, and the cold cathode fluorescent lamp 16 and the lamp cables (18, 19) are fixed thereto by the rubber bush 11. A connector 12 for connection with an inverter circuit is provided at one end of each of the lamp cables (18, 19), and electric power is supplied from an inverter circuit (not shown) provided on the lower surface of the mold 14 to the cold cathode fluorescent lamp 16. Supply. When a cold cathode tube is used as the cold cathode fluorescent lamp 16, the lamp cable 18 connected to the high-voltage side electrode is made shorter than the lamp cable 19 connected to the low-voltage side electrode to suppress fluctuation and loss of electric power. The layout of the mold 14 is designed as follows. A groove for guiding a cable is provided on the side wall of the mold 14, and the lamp cable 19 connected to the low-voltage side electrode of the cold cathode fluorescent lamp 16 is housed in this groove.

As described above, the backlight of the liquid crystal display module shown in FIG. 1 includes the cold cathode fluorescent lamp 16, the wedge-shaped (sideways trapezoidal) light guide 9, the diffusion plates (6, 8), the prism sheet 7, The reflection sheet 10 and the reflection sheet 10 are configured to be fitted in a frame-shaped mold 14 having side walls in the order shown in FIG. The assembled liquid crystal display panel 5 is sandwiched between the upper case 4 and the backlight and fixed, whereby the liquid crystal display module is completed. That is, in the liquid crystal display module shown in FIG. 1, the liquid crystal display panel 5 equipped with a plurality of drain drivers and gate drivers is
It is configured to be housed between an upper case 4 having a display window and a backlight. The area of the display window of the upper case 4 constitutes the display area of the liquid crystal display module (LCM), and the area other than this display area, that is, the area around the display window of the upper case 4 is called a normal frame. .

FIG. 2 is a sectional view for explaining the polarizing plate of the liquid crystal display module shown in FIG. FIG. 2 is a view showing a sectional structure taken along a plane orthogonal to the extension direction of the cold cathode fluorescent lamp 16 shown in FIG. In addition, in FIG.
Illustration of the upper case 4 and the mold 14 is omitted. In FIG. 2, reference numerals 101 and 102 denote substrates (eg, glass substrates). Pixel electrodes, thin film transistors, etc. are formed on the substrate 101. This substrate is generally called a TFT substrate, and the substrate 102 has a counter electrode. , Color filters, etc. are formed, and this substrate is generally called a filter substrate. The pair of substrates (101, 102) are overlapped with each other with a predetermined gap therebetween, and the substrates are bonded together by a sealing material provided in the shape of a frame in the vicinity of the peripheral portion between the two substrates, and a part of the sealing material is used. The liquid crystal is sealed from the liquid crystal sealing port provided in the inside of the substrate between both substrates to seal the liquid crystal, and the polarizing plates (111, 112) are attached to the outside of both substrates. Hereinafter, in this specification, for the sake of convenience, the polarizing plate 111 is referred to as a lower polarizing plate, and the polarizing plate 112 is referred to as an upper polarizing plate. In the liquid crystal display module shown in FIG. 1, in order to improve the brightness of the liquid crystal display panel 5, as shown in FIG.
A polarization reflection plate 50 is provided. This polarization reflector 50
There are a polarizing reflection layer and a quarter-wave plate, and a multilayer film, both of which perform transmission / reflection depending on the polarization state.

In FIG. 2, the light emitted from the cold cathode fluorescent lamp 16 enters the light guide plate 9 directly or after being reflected by the reflector (or lamp reflecting plate) 20. The light that has entered the light guide plate is transmitted by total reflection, and is emitted to the lower diffusion sheet 8 side by being subjected to printing or unevenness, and passes through the lower prism sheet 7a and the upper prism sheet 7b.
It becomes a light beam in a direction perpendicular to the liquid crystal display panel 5 and is emitted from the upper diffusion sheet 6. The light transmitted through the upper diffusion sheet 6 finally becomes a state close to linearly polarized light, and if the transmission linear polarization axis of the polarizing reflection plate 50 and the transmission axis of the lower polarizing plate 111 are aligned, the light is absorbed by the lower polarizing plate 111. On the other hand, the reflected light reflected by the polarization reflection plate 50 is reflected toward the upper polarizing plate side and reused repeatedly, so that the brightness can be increased. In the structure shown in FIG. 2, if the upper diffusion sheet 6 is omitted in order to reduce the thickness, the light reflected by the polarization reflection plate 50 is normally reflected in a state close to regular reflection. The light reflected by interferes with the prism sheet 7b to cause interference fringes (Newton rings) on the display surface of the liquid crystal display panel 5.

<Characteristics of the TFT type liquid crystal display module of the first embodiment of the present invention> FIG. 3 is a sectional view showing a schematic structure of the liquid crystal display module of the present embodiment. FIG. 3 is a view showing a sectional structure taken along a plane orthogonal to the extension direction of the cold cathode fluorescent lamp 16 shown in FIG. The upper case 4 and the mold 14 are also omitted in FIG. In the present embodiment, the lower polarizing plate 11
A polarization reflector 50 is provided on the lower side of 1, and the upper diffusion sheet 6 is omitted. The polarization reflection plate 50 is the support 5
1 and the polarization reflection layer 5 formed on
2 and a (1/4) wave plate 53 formed on the upper surface. As shown in FIG. 3, the (1/4) wave plate 53 is used for the adhesive 40.
The adhesive 40 is formed on the polarization reflection layer 52 by
Thus, it is adhered to the support 31 of the lower polarizing plate 111. The present embodiment is characterized in that, as shown in FIG. 3, a diffusion layer 55 is arranged between the support 51 and the polarization reflection layer 52. Note that, as shown in FIG. 3, the lower polarizing plate 111 is configured by sandwiching the polarizer 32 between the supports (31, 33). Here, the support (31, 33) is made of, for example, triacetyl cellulose. The polarization reflection layer 52 is, for example, a film made of a cholesteric liquid crystal polymer,
Alternatively, it is composed of a layer made of a cholesteric liquid crystal polymer. The (1/4) wave plate 53 is made of polycarbonate, for example.

Also in the present embodiment, the cold cathode fluorescent lamp 1
The light emitted from 6 is reflected directly or by the reflector 20.
The light is reflected by and enters the light guide plate 9. The light that has entered the light guide plate is transmitted by total reflection, and by hitting printing and unevenness,
The light is emitted to the side of the lower diffusion sheet 8 and passes through the lower prism sheet 7a and the upper prism sheet 7b to become a light beam in a direction perpendicular to the liquid crystal display panel 5, and is emitted from the upper prism sheet 7b. The light transmitted through the upper prism sheet 7b finally becomes a state close to linearly polarized light. When the transmission linear polarization axis of the polarization reflection plate 50 and the transmission axis of the lower polarization plate 111 are aligned, the light is absorbed by the lower polarization plate 111. On the other hand, the reflected light reflected by the polarization reflection plate 50 is reflected to the prism sheet side and reused repeatedly, so that the brightness can be increased. Depending on the polarization state of the light transmitted through the prism sheet 7b, it is about 5
It is considered that 0% of the light is reflected. In the present embodiment, the support 51 of the polarization reflection plate 50 and the polarization reflection layer 52.
Since the diffusion layer 55 is provided between and, the light reflected by the polarization reflection layer 52 is diffused by the diffusion layer 55. As a result, even if the upper diffusion sheet 6 is omitted, it does not interfere with the prism sheet 7b and interference fringes (Newton rings) do not occur on the display surface of the liquid crystal display panel 5.

The diffusion layer 55 of the present embodiment is a synthetic resin layer filled with particles such as beads inside, or, for example, a surface of a substrate such as a synthetic resin layer is subjected to surface roughening treatment such as sandblasting or chemical etching. Or a diffusion surface formed by performing a craze generating treatment by mechanical stress, solvent treatment, or the like. In this case, the haze value is preferably 10% or more, and the surface of the support 51 is subjected to surface roughening treatment such as sandblasting or chemical etching, or subjected to craze generating treatment such as mechanical stress or solvent treatment to diffuse. Forming the surface and the diffusion layer 5
It may be 5. In the present embodiment, the case where the polarization reflection plate 50 is composed of the polarization reflection layer 52 and the (1/4) wavelength plate 53 has been described.
As such, there is also known one constituted by a multilayer film. Even with the polarization reflection plate 50 composed of this multilayer film, the same effect can be obtained by providing the diffusion layer 55 between the support 51 of the polarization reflection plate 50 and the polarization reflection layer 52. did it.

[Second Embodiment] <Characteristics of a TFT type liquid crystal display module according to a second embodiment of the present invention> FIG. 4 is a sectional view showing a schematic structure of a liquid crystal display module of the present embodiment. FIG. 4 is a view showing a sectional structure taken along a plane orthogonal to the extension direction of the cold cathode fluorescent lamp 16 shown in FIG. The upper case 4 and the mold 14 are also omitted in FIG. This embodiment is different from the above-described first embodiment in that a diffusion layer 55 is provided on the support itself of the polarization reflection plate 50. The diffusion layer 55 of the present embodiment is formed by filling the inside of the support 51 with particles such as beads. Also in the present embodiment, it is possible to obtain the same actions and effects as those of the above-described first embodiment. Further, also in the present embodiment, the case where the polarization reflection plate 50 is composed of the polarization reflection layer 52 and the (1/4) wavelength plate 53 has been described, but the polarization reflection plate 50 is composed of a multilayer film. Even one
The same effect could be obtained by providing the diffusion layer 55 on the support itself of the polarization reflection plate 50.

[Embodiment 3] <Characteristics of TFT type liquid crystal display module of Embodiment 3 of the present invention> FIG. 5 is a sectional view showing a schematic structure of a liquid crystal display module of the present embodiment. FIG. 5 is a diagram showing a sectional structure taken along a plane orthogonal to the extension direction of the cold cathode fluorescent lamp 16 shown in FIG. The upper case 4 and the mold 14 are also omitted in FIG. The present embodiment is different from the above-described first embodiment in that a diffusion layer 55 is provided outside the support 51 of the polarization reflection plate 50. Diffusion layer 55 of the present embodiment is formed by the same method as in the first embodiment described above. Also in the present embodiment, it is possible to obtain the same actions and effects as those of the above-described first embodiment. Furthermore, also in this embodiment,
The polarization reflection plate 50 has been described as including the polarization reflection layer 52 and the (1/4) wavelength plate 53. However, even if the polarization reflection plate 50 is formed of a multilayer film, the polarization reflection plate The same effect could be obtained by providing the diffusion layer 55 on the outer side of the support 51 of 50.

[Fourth Embodiment] <Characteristics of a TFT type liquid crystal display module according to a fourth embodiment of the present invention> FIG. 6 is a sectional view showing a schematic structure of a liquid crystal display module of the present embodiment. FIG. 6 is a view showing a sectional structure taken along a plane orthogonal to the extension direction of the cold cathode fluorescent lamp 16 shown in FIG. Note that, also in FIG. 6, the upper case 4 and the mold 14 are not shown. In the present embodiment, the antireflection layer 56 is provided on the outside of the support 51 of the polarization reflection plate 50, and thus the first embodiment described above.
Different from. In the present embodiment, since the antireflection layer 56 is provided outside the support 51 of the polarization reflection plate 50, the light reflected by the polarization reflection layer 52 is reflected by the antireflection layer 56.
Therefore, even if the upper diffusion sheet 6 is omitted, the prism sheet 7b is not reflected to the upper prism sheet 7b side.
And the interference fringes (Newton rings) are not generated on the display surface of the liquid crystal display panel 5. The antireflection layer 56 of the present embodiment is a multilayer vapor deposition film formed on the support 51, a low refractive index organic compound containing a fluorine compound, or a low refractive index having microvoids smaller than the wavelength of light in the layer. Rate layer (eg Al ₂ O ₃ , Ce
_{F 3, CeO 2, LaF 3} , MgF 2, Nd 2 O 3, S
iO ₂ , TiO ₂ , ZnO ₂ , ZrO _2, etc.) and the like.

Further, also in the present embodiment, the case where the polarization reflection plate 50 is composed of the polarization reflection layer 52 and the (1/4) wavelength plate 53 has been described.
However, even if it is composed of a multilayer film, the same effect could be obtained by providing the antireflection layer 56 on the outside of the support 51 of the polarization reflection plate 50. In addition, in the present embodiment, the antireflection layer 56 may be provided between the support 51 of the polarization reflection plate 50 and the polarization reflection layer 52. In addition, in the above-described embodiment, the present invention is applied to the TFT.
Although the embodiment applied to the liquid crystal display module of the system has been mainly described, the present invention is not limited to this, and it goes without saying that the present invention is also applicable to the liquid crystal display module of the STN system. Nor. Although the invention made by the present inventor has been specifically described based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. Of course,

[0021]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows. According to the liquid crystal display device of the present invention, it is possible to omit the upper diffusion sheet in the backlight without causing interference fringes on the display surface, and it is possible to further reduce the thickness.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of a TFT type liquid crystal display module to which the present invention is applied.

FIG. 2 is a cross-sectional view for explaining a polarizing plate of the liquid crystal display module shown in FIG.

FIG. 3 is a cross-sectional view showing a schematic structure of the liquid crystal display module according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a schematic structure of a liquid crystal display module according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a schematic structure of a liquid crystal display module according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing a schematic structure of a liquid crystal display module according to a fourth embodiment of the present invention.

[Explanation of symbols]

1, 2 ... Flexible printed wiring board, 3 ... Interface circuit board, 4 ... Upper case, 5 ... Liquid crystal display panel, 6, 8 ... Diffusion sheet, 7a, 7b ... Prism sheet, 9 ... Light guide body, 10 ... Reflection sheet , 11 ... Rubber bush, 12 ... Connector, 14 ... Mold, 16 ... Cold cathode fluorescent lamp, 18, 19 ... Lamp cable, 20 ... Reflector (or lamp reflector), 31, 33, 51 ... Support, 32 ... Polarizer, 40 ... Adhesive, 50 ... Polarizing reflector,
52 ... Polarized reflection layer, 53 ... (1/4) wavelength plate, 55 ... Diffusion layer, 56 ... Antireflection layer, 101, 102 ... Substrate, 11
1,112 ... Polarizing plate.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G02B 5/30 G02B 5/30 // F21Y 103: 00 F21Y 103: 00 (72) Inventor Norihisa Miyama Chiba Prefecture 3300 Hayano, Mobara-shi Hitachi Ltd. Display group (72) Inventor Hitomi Hitomi 3681 Hayano, Mobara-shi, Chiba Hitachi Device Engineering Co., Ltd. (72) Saburo Watanabe 3681 Hayano, Mobara-shi, Chiba Hitachi Device Engineering Co., Ltd. (72) Inventor Masafumi Baba 3300 Hayano, Mobara-shi, Chiba F-Term in Display Group, Hitachi, Ltd. (reference) 2H042 BA02 BA12 BA20 CA13 CA17 2H049 BA02 BA05 BA07 BA42 BB03 BB51 BB62 BB63 BB65 BC22 2H091 FA08X FA08Z FA21Z FA23Z FC29 FC30 FD07 FD12 FD22 LA03 LA 11 LA12 LA13 LA16

Claims (11)

[Claims] 1. A first substrate, a second substrate, and the first substrate.
A liquid crystal display panel having a liquid crystal sandwiched between the second substrate and the second substrate, and the second substrate disposed on a surface of the second substrate opposite to a surface facing the liquid crystal. And a backlight having a prism sheet on the uppermost side opposite to the second substrate, the second substrate has a polarizing reflection plate on a surface opposite to the surface facing the liquid crystal, the polarizing reflection plate, A liquid crystal display device comprising a diffusion layer disposed between the prism sheet and the prism sheet. 2. The polarization reflection plate has a support facing the prism sheet, and a polarization reflection layer provided on the support, and the diffusion layer faces the prism sheet of the support. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided on a surface of the liquid crystal display. 3. The polarization reflection plate has a support facing the prism sheet and a polarization reflection layer provided on the support, and the diffusion layer is provided on the polarization reflection layer of the support. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided on opposite surfaces. 4. The liquid crystal display device according to claim 2, wherein the diffusion layer is a diffusion surface formed on the surface of the support. 5. The polarization reflection plate has a support facing the prism sheet, and a polarization reflection layer provided on the support, and the diffusion layer is provided in the support. The liquid crystal display device according to claim 4, wherein the liquid crystal display device is a liquid crystal display device. 6. The liquid crystal display device according to claim 5, wherein particles are dispersed in the support, and the support functions as the diffusion layer. 7. A first substrate, a second substrate, and the first substrate.
A liquid crystal display panel having a liquid crystal sandwiched between the second substrate and the second substrate, and the second substrate disposed on a surface of the second substrate opposite to a surface facing the liquid crystal. And a backlight having a prism sheet on the uppermost side opposite to the second substrate, the second substrate has a polarizing reflection plate on a surface opposite to the surface facing the liquid crystal, the polarizing reflection plate, A liquid crystal display device comprising an antireflection layer disposed between the prism sheet and the prism sheet. 8. The polarization reflection plate has a support facing the prism sheet and a polarization reflection layer provided on the support, and the antireflection layer is provided on the prism sheet of the support. The liquid crystal display device according to claim 7, wherein the liquid crystal display device is provided on opposite surfaces. 9. The polarization reflection plate has a support facing the prism sheet, and a polarization reflection layer provided on the support, and the antireflection layer is the polarization reflection layer of the support. The liquid crystal display device according to claim 7, wherein the liquid crystal display device is provided on a surface facing to. 10. The liquid crystal display device according to claim 8, wherein the antireflection layer is a multilayer vapor deposition film formed on the support. 11. The liquid crystal display device according to claim 8, wherein the antireflection layer is a low refractive index layer formed on the support.