WO2016065659A1

WO2016065659A1 - Compensation structure of liquid crystal panel and liquid crystal display device

Info

Publication number: WO2016065659A1
Application number: PCT/CN2014/090332
Authority: WO
Inventors: 海博; 康志聪
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2014-10-29
Filing date: 2014-11-05
Publication date: 2016-05-06
Also published as: CN104317104A

Abstract

A compensation structure of a liquid crystal panel is provided. The compensation structure of the liquid crystal panel comprises a liquid crystal panel (10), a first compensation film (11) and a second compensation film (12) which are arranged on two sides of the liquid crystal panel (10); the liquid crystal panel (10) is provided with a liquid crystal layer comprising a plurality of liquid crystal molecules, anisotropy of refractive index of the liquid crystal layer is Δn, thickness of the liquid crystal layer is d, and pre-tilt angles of the liquid crystal molecules are θ; the first compensation film (11) is a biaxial compensation film with in-plane compensation value of Ro1 and thickness compensation value of Rth1; the second compensation film (12) is a homotaxial compensation film with thickness compensation value of Rth2, wherein 324.3nm≤Δn*d≤342.7nm; 85°≤θ<90°; 55nm≤Ro1≤78nm; 208nm≤Rth1≤293nm; Y1nm≤Rth2≤Y2nm; Y1=0.001897*(Rth1)2-2.01*Rth1+438.7; Y2=-0.005756*(Rth1)2+1.654*Rth1+55.7. A liquid crystal display device with the compensation structure of liquid crystal panel is also provided.

Description

Liquid crystal panel compensation structure and liquid crystal display device

Technical field

The present invention relates to the field of liquid crystal display technologies, and in particular, to a liquid crystal panel compensation architecture and a liquid crystal display device.

Background technique

Liquid Crystal Display (LCD) is a flat ultra-thin display device consisting of a certain number of color or black-and-white pixels placed in front of a light source or a reflective surface. LCD monitors have low power consumption and are characterized by high image quality, small size, and light weight. Therefore, they are favored by everyone and become the mainstream of displays. At present, liquid crystal displays are mainly Thin Film Transistor (TFT) liquid crystal displays.

As the area of the TFT-LCD increases, the viewing angle increases, the contrast of the picture decreases, and the sharpness of the picture decreases. This is a result of the change in the birefringence of the liquid crystal molecules in the liquid crystal layer as a function of the viewing angle. . For an ordinary liquid crystal display, when viewing an ordinary liquid crystal display from a certain angle, it will find its brightness loss (darkening) and discoloration. Conventional liquid crystal displays typically have a viewing angle of only 90 degrees, that is, 45 degrees on each of the left and right sides. The linear liquid crystal for producing a liquid crystal display panel is a substance having a birefringence Δn. When the light passes through the liquid crystal molecules, it can be divided into two directions: ordinary ray and extraordinary ray, if the light is obliquely incident. The liquid crystal molecules produce two refracted rays. The birefringence of the light Δn=ne-no, ne indicates the refractive index of the liquid crystal molecules to ordinary light, and no indicates the refractive index of the liquid crystal molecules to extraordinary rays. Therefore, when the light passes through the liquid crystal sandwiched between the upper and lower pieces of glass, the light will have a phase retardation phenomenon. The light characteristics of the liquid crystal cell are usually measured by the phase delay Δn×d, also known as the optical path difference, Δn is the birefringence, d is the thickness of the liquid crystal cell, and the difference in phase retardation at different viewing angles of the liquid crystal cell is the problem of viewing angle. origin. The phase retardation of a good optical compensation film can cancel out the phase retardation of the linear liquid crystal, and the viewing angle of the liquid crystal panel can be widened.

The compensation principle of the optical compensation film is generally to correct the phase difference generated by the liquid crystal at different viewing angles, so that the birefringence properties of the liquid crystal molecules are compensated for symmetry. Compensation by optical compensation film can effectively reduce the light leakage of the dark state picture, and can greatly improve the contrast of the picture within a certain angle of view. Optical supplement The compensation film can be divided into a phase difference film, a color difference compensation film, and a viewing angle expansion film which are simply changed in phase. The use of an optical compensation film can reduce the amount of light leakage in the dark state of the liquid crystal display, and can greatly improve the contrast, chromaticity and overcome some gray scale inversion problems in a certain viewing angle. The main parameters for measuring the characteristics of the optical compensation film include the in-plane compensation value Ro in the plane direction, the thickness compensation value Rth in the thickness direction, the refractive index N, and the film thickness D, which satisfy the following relationship:

Ro=(Nx-Ny)×D;

Rth=[(Nx+Ny)/2-Nz]×D;

Where Nx is the refractive index along the slow axis (the axis with the largest refractive index, that is, the direction of vibration where the light has a slower propagation velocity) in the plane of the film, and Ny is the fast axis along the plane of the film (with the smallest refractive index) The axis, that is, the direction of vibration in which the light wave has a relatively fast propagation rate, perpendicular to Nx), and Nz is the refractive index in the plane of the film (perpendicular to Nx and Ny).

The optical compensation film used is different for different liquid crystal display modes, that is, different liquid crystal cell types, and the Ro and Rth values are also adjusted to appropriate values. Most of the optical compensation films used in the large-size LCD TVs are for the VA (Vertical Alignment) display mode. The early use of Konica (Konica) N-TAC has been developed to form the OPTES company. Zeonor, Fujitsu's F-TAC series, Nitto Denko's X-plate, etc.

For different LCD optical path differences, different optical compensation modes need to be designed. For a liquid crystal panel having an optical path difference of 324.3 to 342.7 nm, referring to FIG. 1 and FIG. 2, FIG. 1 is a dark state full-view brightness contour distribution diagram of the liquid crystal panel compensated by a conventional compensation architecture; 2 is a contrast contour distribution map of a full-view angle of the liquid crystal panel compensated by the double-layer dual-axis compensation architecture. As can be seen from Figures 1 and 2, the current compensation structure is used for compensation, and the light is leaked at a horizontal viewing angle of phi=20-40°, phi=140-160°, phi=200-220°, and phi=310-330°. Severe, dark state of light leakage is more close to the horizontal angle of view, and the contrast and clarity of these angles are low, and the relative position of the general viewer and the TV determines that the area close to the horizontal angle of view is more easily seen by the audience, so these perspectives Contrast and sharpness have the greatest impact on viewing.

Summary of the invention

In view of the deficiencies of the prior art, the present invention provides a liquid crystal panel compensation architecture. For a liquid crystal panel having an optical path difference of 324.3 to 342.7 nm, the dark state light leakage problem of the liquid crystal panel can be effectively reduced by setting a compensation value. , increase the contrast and sharpness of large viewing angles.

In order to achieve the above object, the present invention adopts the following technical solutions:

A liquid crystal panel compensation structure, comprising: a liquid crystal panel; and a first compensation film and a second compensation film respectively disposed on two sides of the liquid crystal panel; the liquid crystal panel is provided with a liquid crystal layer including a plurality of liquid crystal molecules, The refractive index anisotropy of the liquid crystal layer is Δn, the thickness is d, and the pretilt angle of the liquid crystal molecules is θ; the first compensation film is a biaxial compensation film, and the in-plane compensation value is Ro1, and the thickness compensation value is Rth1; The second compensation film is a uniaxial compensation film, and the thickness compensation value is Rth2, wherein:

324.3 nm ≤ Δn × d ≤ 342.7 nm;

85° ≤ θ < 90 °;

55nm≤Ro1≤78nm;

208 nm ≤ Rth1 ≤ 293 nm;

Y1nm≤Rth2≤Y2nm;

Y1=0.001897×(Rth1) ² -2.01×Rth1+438.7;

Y2 = -0.005756 × (Rth1) ² +1.654 × Rth1 + 55.7.

Among them, 58 nm ≤ Ro1 ≤ 71 nm, and 220 nm ≤ Rth1 ≤ 269 nm.

Among them, 44 nm ≤ Rth2 ≤ 139 nm.

The first compensation film is further provided with a first polarizing film and a first protective film; and the second compensation film is further provided with a second polarizing film and a second protective film.

Wherein, the materials of the first polarizing film and the second polarizing film are both polyvinyl alcohol.

Wherein, the materials of the first protective film and the second protective film are all cellulose triacetate.

Wherein the angle between the absorption axis of the first polarizing film and the slow axis of the first compensation film is 90°; the angle between the absorption axis of the second polarizing film and the slow axis of the second compensation film It is 90°.

a first adhesive layer is further disposed between the liquid crystal panel and the first compensation film; a second adhesive layer is further disposed between the liquid crystal panel and the second compensation film; The materials of the adhesive layer and the second adhesive layer are both pressure sensitive adhesives.

The liquid crystal panel is a liquid crystal panel in a vertical alignment mode.

Another aspect of the present invention provides a liquid crystal display device including a liquid crystal panel and a backlight module. The liquid crystal panel is disposed opposite to the backlight module, and the backlight module provides a display light source to the liquid crystal panel. And causing the liquid crystal panel to display an image, wherein the liquid crystal panel adopts the supplement as described above Reimbursement of the LCD panel.

Compared with the prior art, in the present invention, for a liquid crystal panel having an optical path difference of 324.3 to 342.7 nm, by setting a compensation value of the double-layer compensation film, the dark state light leakage problem of the liquid crystal panel can be effectively reduced, and the problem is increased. The contrast and sharpness of the viewing angle enhances the visual range of the large viewing angle.

DRAWINGS

FIG. 1 is a view showing a brightness profile of a dark state full-view angle of a conventional liquid crystal panel.

2 is a view showing a contour view of a full-view angle of the liquid crystal panel shown in FIG. 1.

FIG. 3 is an exemplary illustration of a liquid crystal display device according to an embodiment of the present invention.

FIG. 4 is an exemplary illustration of a liquid crystal panel provided by an embodiment of the present invention.

FIG. 5 is a graph showing a trend of a dark state light leakage with a compensation value when a liquid crystal optical path difference is 324.3 nm according to an embodiment of the present invention.

FIG. 6 is a graph showing a trend of a dark state light leakage with a compensation value when a liquid crystal optical path difference is 333.6 nm according to an embodiment of the present invention.

FIG. 7 is a graph showing a trend of a dark state light leakage with a compensation value when a liquid crystal optical path difference is 342.7 nm according to an embodiment of the present invention.

FIG. 8 is a brightness profile view of a dark state full view angle of a compensated liquid crystal panel in a specific embodiment. FIG.

Fig. 9 is a view showing a contour distribution of a full viewing angle and the like of the liquid crystal panel shown in Fig. 7.

FIG. 10 is a brightness profile view of a dark state full-view angle of the compensated liquid crystal panel in another embodiment. FIG.

Fig. 11 is a view showing a contour distribution of a full-view angle and the like of the liquid crystal panel shown in Fig. 10.

FIG. 12 is a view showing a brightness state distribution of a dark state full-view angle of a liquid crystal panel after compensation in another embodiment. FIG.

Fig. 13 is a view showing a contour distribution of a full viewing angle and the like of the liquid crystal panel shown in Fig. 12.

detailed description

In order to make the objects, the technical solutions and the advantages of the present invention more comprehensible, the invention will be further described with reference to the accompanying drawings.

As shown in FIG. 3, the liquid crystal display device of the present embodiment includes a liquid crystal panel 100 and a backlight module 200. The liquid crystal panel 100 is disposed opposite to the backlight module 200, and the backlight module 200 provides a display light source. The liquid crystal panel 100 is configured to display an image on the liquid crystal panel 100, wherein the liquid crystal panel 100 is a liquid crystal panel compensated by a compensation structure having a double-layer compensation film.

Specifically, the liquid crystal panel compensation structure is as shown in FIG. 4 , and the liquid crystal panel compensation structure includes a liquid crystal panel 10 and first compensation films 11 and second compensation films 12 respectively disposed on two sides of the liquid crystal panel 10 . The first compensation film 11 is also provided with a first polarizing film 13 and a first protective film 15 in this order; the second compensation film 12 is further provided with a second polarizing film 14 and a second protective film 16 in this order. A first adhesive layer 17 is further disposed between the liquid crystal panel 10 and the first compensation film 11; a second adhesive layer 18 is further disposed between the liquid crystal panel 10 and the second compensation film 12. The liquid crystal panel 10 is a Vertical Alignment Cell (VA Cell); the first polarizing film 13 and the second polarizing film 14 are made of polyvinyl alcohol (PVA), and the first polarizing film 13 is used. The angle between the absorption axis and the slow axis of the first compensation film 11 is set to 90°, and the angle between the absorption axis of the second polarizing film 14 and the slow axis of the second compensation film 12 is set to 90°; the first protective film 15 The material of the second protective film 16 is triacetyl cellulose (TAC), and the TAC protective films 15, 16 are mainly used to protect the PVA polarizing films 13, 14 to lift the PVA polarizing film 13, 14. The properties prevent the PVA polarizing films 13, 14 from being retracted, and the materials of the first adhesive layer 17 and the second adhesive layer 18 are all pressure sensitive adhesives (PSAs). The liquid crystal panel 10 is provided with a liquid crystal layer including a plurality of liquid crystal molecules having a refractive index anisotropy of Δn, a thickness d, and a liquid crystal molecule having a pretilt angle of θ. In the above compensation structure, the first compensation film 11 is a two-axis compensation film, the in-plane compensation value is represented by Ro1, the thickness compensation value is represented by Rth1, and the second compensation film 12 is a uniaxial compensation film, and the thickness compensation value is adopted. Rth2 said.

In the above architecture, the purpose is to effectively reduce the liquid crystal panel by appropriately setting the compensation values of the first compensation film 11 and the second compensation film 12 for the liquid crystal panel having an optical path difference of 324.3 to 342.7 nm. Dark-state light leakage problems increase the contrast and sharpness of large viewing angles.

In the process of simulation, the following settings were made:

First, the liquid crystal layer setting:

1. The pretilt angle θ is 85° ≤ θ < 90°;

2. The four quadrant liquid crystal tilt angles are 45°, 135°, 225° and 315°, respectively;

3. The optical path difference Δn × d is 342.8 nm ≤ Δn × d ≤ 361.4 nm.

Second, the backlight settings:

1. Light source: blue-yttrium aluminum garnet light emitting diode (Blue-YAG LED) spectrum;

2. The central brightness of the light source is defined as 100 nits (nit);

3. The light source distribution is Lambert's distribution.

Referring to FIG. 5-7, FIG. 5 is a graph showing a trend of a dark state light leakage with a compensation value when the liquid crystal optical path difference is 324.3 nm and the pretilt angle θ is 89° in the liquid crystal display device of the embodiment; FIG. The liquid crystal display device has a trend of changing the dark state light leakage with the compensation value when the liquid crystal optical path difference is 333.6 nm and the pretilt angle θ is 89°; FIG. 7 is a liquid crystal display device of the present embodiment having a liquid crystal optical path difference of 342.7 nm. The dark state light leakage when the inclination angle θ is 89° changes with the compensation value trend graph. Therefore, in the same way, with different pre-tilt angles and different compensation values for simulation, it can be obtained in the range of 324.3nm ≤ Δn × d ≤ 342.7nm, 85 ° ≤ θ < 90 °, dark state light leakage is less than 0.2 When nit, the corresponding compensation values of the first compensation film 11 and the second compensation film 12 are respectively: 55 nm ≤ Ro1 ≤ 78 nm; 208 nm ≤ Rth1 ≤ 293 nm; Y1 nm ≤ Rth2 ≤ Y2 nm;

Y1=0.001897×(Rth1) ² -2.01×Rth1+438.7;

Y2 = -0.005756 × (Rth1) ² +1.654 × Rth1 + 55.7.

Due to the compensation values Ro, Rth of the compensation film, the refractive index N and the thickness D have the following relationship:

Ro=(Nx-Ny)×D;

Rth=[(Nx+Ny)/2-Nz]×D;

For a uniaxial compensation film, Nx = Ny, that is, Ro = 0.

Therefore, the compensation value can be changed in the following three ways:

1. On the basis of the constant refractive index N of the compensation film, the thickness D is changed to change the compensation value;

2. On the basis that the thickness D of the compensation film is constant, the refractive index N is changed to change the compensation value;

3. On the basis of ensuring the compensation value range of the compensation film, the thickness D and the refractive index N are simultaneously changed to change the compensation value.

The following is to select some specific compensation values and test the corresponding compensation results, and further explain the technical effects obtained by the technical solution of the present invention.

Referring to FIG. 8 and FIG. 9 , FIG. 8 is a dark state full-view and other brightness contour distribution diagram of the liquid crystal panel after compensation in a specific embodiment, and FIG. 9 is a full-view equal-contrast contour of the compensated liquid crystal panel in the specific embodiment. Distribution. The setting conditions of FIGS. 8 and 9 are: optical path difference Δn×d=324.3 nm, pretilt angle θ=89°, Ro1=71 nm, Rth1=269 nm, and Rth2=44 nm. The maximum dark state light leakage value measured is 0.1 nit. Comparing FIG. 8 with FIG. 1 , it can be directly observed that the dark state light leakage of the liquid crystal panel compensated by the compensation architecture of the embodiment is far lower than the dark state light leakage of the existing liquid crystal panel. Comparing FIG. 9 with FIG. 2, it can be directly observed that the liquid crystal panel compensated by the compensation architecture of the embodiment has a full viewing angle contrast distribution superior to that of the existing liquid crystal panel.

Referring to FIG. 10 and FIG. 11 , FIG. 10 is a dark state full-view and other brightness contour distribution diagram of the compensated liquid crystal panel in an embodiment, and FIG. 11 is a full-view equal-contrast contour of the compensated liquid crystal panel in the embodiment. Distribution. The setting conditions of FIGS. 10 and 11 are: optical path difference Δn×d=333.6 nm, pretilt angle θ=89°, Ro1=65 nm, Rth1=244 nm, and Rth2=95 nm. The maximum dark state light leakage value measured was 0.14 nit. Comparing FIG. 10 with FIG. 1 , it can be directly observed that the dark state light leakage of the liquid crystal panel compensated by the compensation structure of the embodiment is far lower than the dark state light leakage of the existing liquid crystal panel. Comparing FIG. 11 with FIG. 2, it can be directly observed that the liquid crystal panel compensated by the compensation architecture of the embodiment has a full viewing angle contrast distribution superior to that of the existing liquid crystal panel.

Referring to FIG. 12 and FIG. 13 , FIG. 12 is a dark state full-view and other brightness contour distribution diagram of the compensated liquid crystal panel in a specific embodiment, and FIG. 13 is a full-view equal-contrast contour of the compensated liquid crystal panel in the embodiment. Distribution. The setting conditions of FIGS. 12 and 13 are: optical path difference Δn×d=342.7 nm, pretilt angle θ=89°, Ro1=58 nm, Rth1=220 nm, and Rth2=139 nm. The maximum dark state light leakage value measured was 0.19 nit. Comparing FIG. 12 with FIG. 1 , it can be directly observed that the dark state light leakage of the liquid crystal panel compensated by the compensation structure of the embodiment is far lower than the dark state light leakage of the existing liquid crystal panel. Comparing FIG. 13 with FIG. 2, it can be directly observed that the liquid crystal panel compensated by the compensation architecture of the embodiment has a full viewing angle contrast distribution superior to that of the existing liquid crystal panel.

In the above three specific embodiments, the specific values of the optical path difference Δn × d, the pretilt angle θ, and Ro1, Rth1, Ro2, and Rth2 are merely described as an example. It has been proved by practice that when the values of these parameters are in the following range, namely: 55nm≤Ro1≤78nm; 208nm≤Rth1≤293nm; Y1nm≤Rth2≤Y2nm; Y1=0.001897×(Rth1) ² -2.01×Rth1+438.7 ; Y2 = -0.005756 × (Rth1) ² +1.654 × Rth1 + 55.7, all of which can achieve the same or similar technical effects as the above specific examples.

In summary, in the present invention, for a liquid crystal panel with a lower optical path difference, by setting a compensation value of the double-layer biaxial compensation film, the dark state light leakage problem of the liquid crystal panel can be effectively reduced, and the contrast and sharpness of the large viewing angle are increased. Degree, to enhance the visual range of large viewing angles.

It should be noted that, in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply such entities or operations. There is any such actual relationship or order between them. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The above description is only a specific embodiment of the present application, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present application. It should be considered as the scope of protection of this application.

Claims

A liquid crystal panel compensation structure, comprising: a liquid crystal panel; and a first compensation film and a second compensation film respectively disposed on two sides of the liquid crystal panel; the liquid crystal panel is provided with a liquid crystal layer including a plurality of liquid crystal molecules, The refractive index anisotropy of the liquid crystal layer is Δn, the thickness is d, and the pretilt angle of the liquid crystal molecules is θ; the first compensation film is a biaxial compensation film, and the in-plane compensation value is Ro1, and the thickness compensation value is Rth1; The second compensation film is a uniaxial compensation film, and the thickness compensation value is Rth2, wherein:

324.3 nm ≤ Δn × d ≤ 342.7 nm;

85° ≤ θ < 90 °;

55nm≤Ro1≤78nm;

208 nm ≤ Rth1 ≤ 293 nm;

Y1nm≤Rth2≤Y2nm;

Y1=0.001897×(Rth1) 2 -2.01×Rth1+438.7;

Y2 = -0.005756 × (Rth1) 2 +1.654 × Rth1 + 55.7.
The liquid crystal panel compensation architecture according to claim 1, wherein 58 nm ≤ Ro1 ≤ 71 nm, and 220 nm ≤ Rth1 ≤ 269 nm.
The liquid crystal panel compensation architecture according to claim 2, wherein 44 nm ≤ Rth2 ≤ 139 nm.
The compensation structure of the liquid crystal panel according to claim 1, wherein the first compensation film is further provided with a first polarizing film and a first protective film; and the second compensation film is further provided with a second a polarizing film and a second protective film.
The liquid crystal panel compensation structure according to claim 4, wherein the materials of the first polarizing film and the second polarizing film are both polyvinyl alcohol.
The liquid crystal panel compensation structure according to claim 4, wherein the materials of the first protective film and the second protective film are all cellulose triacetate.
The liquid crystal panel compensation structure according to claim 4, wherein an angle between an absorption axis of the first polarizing film and a slow axis of the first compensation film is 90°; an absorption axis of the second polarizing film The angle of the slow axis of the second compensation film is 90°.
The liquid crystal panel compensation structure according to claim 1, wherein a first adhesive layer is further disposed between the liquid crystal panel and the first compensation film; and between the liquid crystal panel and the second compensation film A second adhesive layer is provided; the materials of the first adhesive layer and the second adhesive layer are pressure sensitive adhesives.
The liquid crystal panel compensation architecture according to claim 1, wherein the liquid crystal panel is a liquid crystal panel in a vertical alignment mode.
A liquid crystal display device includes a liquid crystal panel and a backlight module, the liquid crystal panel is disposed opposite to the backlight module, and the backlight module provides a display light source to the liquid crystal panel, so that the liquid crystal panel displays an image. The liquid crystal panel is provided with a compensation structure, and the structure includes a first compensation film and a second compensation film respectively disposed on two sides of the liquid crystal panel; the liquid crystal panel is provided with a liquid crystal layer including a plurality of liquid crystal molecules. The refractive index anisotropy of the liquid crystal layer is Δn, the thickness is d, and the pretilt angle of the liquid crystal molecules is θ; the first compensation film is a biaxial compensation film, the in-plane compensation value is Ro1, and the thickness compensation value is Rth1; The second compensation film is a uniaxial compensation film, and the thickness compensation value is Rth2, wherein:

324.3 nm ≤ Δn × d ≤ 342.7 nm;

85° ≤ θ < 90 °;

55nm≤Ro1≤78nm;

208 nm ≤ Rth1 ≤ 293 nm;

Y1nm≤Rth2≤Y2nm;

Y1=0.001897×(Rth1) 2 -2.01×Rth1+438.7;

Y2 = -0.005756 × (Rth1) 2 +1.654 × Rth1 + 55.7.
The liquid crystal display device according to claim 10, wherein 58 nm ≤ Ro1 ≤ 71 nm, and 220 nm ≤ Rth1 ≤ 269 nm.
The liquid crystal display device according to claim 11, wherein 44 nm ≤ Rth2 ≤ 139 nm.
The liquid crystal display device according to claim 10, wherein the first compensation film is further provided with a first polarizing film and a first protective film; and the second compensation film is further provided with a second polarizing film. Membrane and second protective film.
The liquid crystal display device according to claim 13, wherein the materials of the first polarizing film and the second polarizing film are both polyvinyl alcohol.
The liquid crystal display device according to claim 13, wherein the material of the first protective film and the second protective film is cellulose triacetate.
The liquid crystal display device according to claim 13, wherein an angle between an absorption axis of the first polarizing film and a slow axis of the first compensation film is 90°; an absorption axis of the second polarizing film The angle of the slow axis of the second compensation film is 90°.
The liquid crystal display device according to claim 10, wherein a first adhesive layer is further disposed between the liquid crystal panel and the first compensation film; and a liquid crystal panel and the second compensation film are further disposed There is a second adhesive layer; the materials of the first adhesive layer and the second adhesive layer are pressure sensitive adhesives.
The liquid crystal display device according to claim 10, wherein the liquid crystal panel is a liquid crystal panel in a vertical alignment mode.