WO2020062591A1

WO2020062591A1 - Polarizing plate and display device

Info

Publication number: WO2020062591A1
Application number: PCT/CN2018/120015
Authority: WO
Inventors: 康志聪
Original assignee: 惠科股份有限公司; 重庆惠科金渝光电科技有限公司
Priority date: 2018-09-30
Filing date: 2018-12-10
Publication date: 2020-04-02
Also published as: CN109143445A

Abstract

A polarizing plate and a display device. The polarizing plate (10) comprises: a support protective film (100) having a large refractive index and provided with a plurality of projecting structures (101), part of the surface of the projecting structure (101) being curved; and an optical compensation film (200) having a small refractive index, the optical compensation film (200) being provided with grooves (210) matching the plurality of projecting structures (101).

Description

Polarizing plate and display device

Cross-reference to related applications

This application claims the priority of a Chinese patent application filed on September 30, 2018 with the Chinese Patent Office, application number 201811161580.7, and application name "Polarizing Plate, Display Panel and Display Device", the entire contents of which are incorporated herein by reference. in.

Technical field

The present application relates to the field of display technology, and in particular, to a polarizing plate and a display device.

Background technique

The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

With the development of display technology, display devices have been widely used because of their advantages such as high picture quality, power saving, and thin body. Among them, the quality of the picture is the most important factor affecting consumer experience. The display device is generally composed of a backlight module and a display panel placed on the backlight module. The backlight module provides incident light for the display panel. The incident light is usually concentrated and incident on the display panel. Therefore, when viewing the display screen in the frontal direction, It can obtain better display image quality, but when viewing the display screen in the side view direction, the image quality is poor and the color cast is more serious, which makes the viewing angle of normal display smaller. At present, in a VA (Vertical Alignment Liquid Crystal) vertical liquid crystal display, a sub-pixel in a filter is again divided into a plurality of sub-pixels to improve the image quality of a side viewing angle, thereby expanding the viewing angle. However, this method requires more TFT (Thin Film Transistor) elements to drive the sub-pixels. This will inevitably increase the metal traces inside the panel, causing the light-transmissive area to become smaller, affecting the light transmittance of the panel and affecting Picture quality. In order to ensure the brightness, it is necessary to improve the performance of the backlight module so that it can generate incident light with higher brightness, which will increase the cost of the backlight.

Application content

According to various embodiments of the present application, a polarizing plate capable of improving a display angle of a display device with a small display angle and poor side-view image quality, without increasing cost, is provided.

In addition, a display device is provided.

A polarizing plate includes:

A support protective film having a first refractive index, the support protective film having a light incident surface and a light emitting surface, and a plurality of convex structures having a preset shape are provided on the light emitting surface, and the convex An angle formed by at least a part of the surface of the lifting structure and the light incident surface is an acute angle;

An optical compensation film is formed on the light emitting surface, the optical compensation film has a second refractive index, the first refractive index is greater than the second refractive index, and the optical compensation film is in contact with the support and protection film A plurality of grooves having the same shape and size as the convex structure are formed on the surface; and

A polarizing film is provided on the optical compensation film.

A polarizing plate includes:

A support protective film having a first refractive index, the support protective film having a light incident surface and a light emitting surface, and a plurality of convex structures having a preset shape are provided on the light emitting surface, and the convex At least part of the surface of the lifting structure is a circular arc surface, and an angle formed by the circular arc surface and the light incident surface is an acute angle;

An optical compensation film is formed on the light emitting surface, the optical compensation film has a second refractive index, the first refractive index is greater than the second refractive index, and the optical compensation film is in contact with the support and protection film A plurality of grooves having the same shape and size as the convex structure are formed on the surface;

The optical compensation film is a positive single optical axis A-compensation film, the first refractive index is a normal refractive index of the positive single optical axis A-compensation film, and the positive single optical axis A-compensation film Containing nematic liquid crystal molecules, the optical axis of the nematic liquid crystal molecules is parallel to the light incident surface; and

A polarizing film is provided on the optical compensation film.

A display device includes:

Backlight module for providing light source;

A display panel placed on one side of the backlight module for displaying a picture;

The display panel includes a polarizing plate, and the polarizing plate includes:

A polarizing film is provided on the optical compensation film.

Because the polarizing plate and the display device are provided with a supporting protective film and an optical compensation film, and the first refractive index is greater than the second refractive index, that is, light enters the supporting protective film from the light incident surface of the supporting protective film and penetrates the supporting protective film. When the film enters the optical compensation film, it enters the optical dense from the light dense, so the phenomenon of refraction occurs at the contact interface between the two films, which deflects the light. Since most light rays are incident perpendicularly to the light incident surface in the liquid crystal display device, in the exemplary technology, the surface of each layer of the polarizing plate is flat and perpendicular to the normal incident light, so most of the incident light is incident perpendicularly to the polarized light. It still shoots out vertically when it is on the board, resulting in better image quality in front viewing angle and poor image quality in side viewing angle. In this solution, a convex structure is formed on the light-emitting surface of the supporting protective film. At least part of the surface of the convex structure forms an acute angle with the light-entering surface. After incident light enters the supporting protective film, it forms on the surface of the convex structure. The angle of incidence is less than 90 °. Therefore, in order to cause refraction, the vertically incident light is deflected, so that the energy of the positive viewing angle is distributed to the side viewing angle, and the image quality of the side viewing angle is improved. At the same time, the support protective film and optical compensation film also have a phase compensation function, which can correct the phenomenon of phase retardation and color shift after light passes through the liquid crystal layer.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments or exemplary technologies of the present application, the drawings used in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, without any creative effort, drawings of other embodiments can be obtained according to these drawings.

FIG. 1 is a schematic diagram of a partial structure of a polarizing plate in an embodiment; FIG.

2 is a schematic structural diagram of a supporting protective film in an embodiment;

3A is a perspective structural view of a supporting protective film in an embodiment;

3B is a schematic perspective view of a supporting protective film in another embodiment;

4A is a schematic structural diagram of a supporting protective film in another embodiment;

4B is a schematic perspective view of a supporting protective film in another embodiment;

5A is a partial cross-sectional view of a polarizing plate in an embodiment;

5B is a partial cross-sectional view of a polarizing plate in another embodiment;

6 is a schematic structural diagram of a polarizing plate in an embodiment;

7 is a schematic structural diagram of a display device according to an embodiment;

FIG. 8 is a cross-sectional view of the display panel structure in FIG. 7.

detailed description

In order to facilitate understanding of the present application, the present application will be described more fully with reference to the related drawings. The drawings show alternative embodiments of the present application. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and comprehensive understanding of the disclosure of this application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

In the description of this application, it should be understood that the orientations or positional relationships indicated by the terms "up", "down", "vertical", "horizontal", "inside", "outside" and the like are based on the drawings The method or position relationship is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, structure and operation in a specific orientation, so it cannot be understood as a limitation on this application. .

As shown in FIG. 1, the polarizing plate 10 may include a support protective film 100, an optical compensation film 200, and a polarizing film 300. The support protective film 100 has a light-entering surface and a light-exiting surface. The light-entering surface is a side that receives incident light. Light enters the support-protective film 100 from the incident surface and exits from the light-exiting surface. The light-exiting surface is provided with a plurality of preset shapes. The convex structure 101 has an angle formed by at least a part of the surface of the convex structure 101 with the light incident surface, α is an acute angle, and satisfies 0 ° <α <90 °. Setting an included angle between a part of the surface of the convex structure 101 and the light incident surface to be an acute angle, so that when light enters the first phase compensation film 100 from the light incident surface and exits from the light emitting surface, it will be caused by the convexity opened on the light emitting surface. The structure 101 generates a refraction phenomenon. The optical compensation film 200 is formed on the support protective film 100. The optical compensation film 200 is provided with a plurality of grooves 210 having the same shape and size as the convex structure 101 on the surface in contact with the support protective film 100, that is, the optical compensation film 200. The support film 100 can be completely bonded to each other through the protruding structure 101 and the groove 210. The support protective film 100 has a first refractive index n1, the optical compensation film 200 has a second refractive index n2, and the first refractive index n1 is larger than the second refractive index n2. When light penetrates the support protective film 100 and enters the optical compensation film 200, it enters the photophosphite from the light dense material, and therefore, refraction occurs at the contact interface between the support protective film 100 and the optical compensation film 200. In the display device, since most of the light is incident into the polarizing plate vertically, that is, most of the light is perpendicular to the light incident surface, the solution is provided by supporting and protecting the film 100 and the optical compensation film 200 with different refractive indexes and protecting the The light emitting surface of the film 100 is provided with a convex structure 101. When the vertically incident light enters the optical compensation film 200 from the support and protection film 100, combining the surface characteristics of the convex structure 101, the surface of the convex structure 101 will be refracted and the vertical incidence will be changed. The propagation path of light deflects the light, so that the light energy of the positive viewing angle is distributed to the large viewing angle, and the image quality of the side viewing angle is improved. The polarizing plate 10 further includes a polarizing film 300. The polarizing film 300 is used to polarize incident light and emit the polarized light.

In an embodiment, the polarizing film 300 may be a PVA (Polyvinyl alcohol) material, which mainly absorbs and penetrates polarized light. The polarizing film 300 is a product commonly used in the market. The transmission axis is Products parallel to the 0/180 degree direction and absorption axis parallel to the 90/270 degree direction. Of course, the polarizing film 300 can also select that the transmission axis is parallel to the 90/270 degree direction, and the absorption axis is parallel to the 0/180 degree direction.

Please refer to FIG. 1 and FIG. 2 at the same time, when the light R0 vertically penetrates the support protective film 100 and enters the optical compensation film 200, the incident angle of the vertically incident light on the surface of the convex structure is γ, 0 <γ <90 °, so the light Refraction will occur, and the refraction angle is β. Since the light enters from the dense to the light, so β is greater than γ, that is, the light propagation path changes, and the light R1 deviates from the original normal incidence direction and diverges to the side, so there will be more A lot of light enters the side, improving the image quality of the side viewing angle. It can be understood that the larger the difference between the first refractive index n1 and the second refractive index n2, the larger the refraction angle when refraction occurs, and the easier it is to distribute the frontal light type energy to a large viewing angle. In one embodiment, the value range of the first refractive index n1 is 1.0 <n1 <2.5, and the value range of the second refractive index n2 is 1.0 <n1 <2.5. In one embodiment, if m = n1-n2, the preferred value range of m is 0.01 <m <1.5.

As shown in FIG. 3A, a plurality of protruding structures 101 are formed on the light-emitting surface of the supporting protective film 100. The plurality of protruding structures 101 are strip-shaped structures and a part of the surface of the strip-shaped structures is an arc-shaped curved surface. Can be set side by side. It can be understood that a part of the surface referred to herein may be a side of the convex structure 101 opposite to the light emitting surface, that is, an upper surface of the convex structure 101. When the upper surface of the convex structure 101 is an arc-shaped curved surface, the angle between the arc-shaped surface and the light incident surface of the supporting protective film 100 may be the angle between the tangent of any point on the surface of the arc-shaped curved surface and the light incident surface. The included angle is an acute angle, that is, α in FIG. 1, and 0 ° <α <90 °. As shown in FIG. 3B, a part of the surface of the convex structure 101 may also be a spherical curved surface. It can be understood that the part of the surface referred to herein may be a side of the convex structure 101 opposite to the light emitting surface, that is, the upper surface of the convex structure 101 . The plurality of convex structures 101 may be distributed in a two-dimensional matrix array on the light emitting surface. The angle between the spherical curved surface and the light incident surface of the support and protection film 100 is the angle between a tangent passing through any point on the surface of the spherical curved surface and the light incident surface. The included angle is an acute angle, that is, α in FIG. 1, and 0 ° <α <90 °. Because in the display device, most of the light generated by the backlight module is incident on the display panel vertically, that is, most of the light incident on the phase compensation film is perpendicular to the light incident surface of the phase compensation film. In this solution, since the curved convex structure 101 is provided, it can refract the normal incident light, and the light deviates from the original normal incident direction and diverges to the side. Therefore, more light will enter the side, and the angle of the side view is improved. Picture quality. When the upper surface of the convex structure 101 is a circular arc surface and a plurality of convex structures 101 are arranged side by side, refraction occurs only in a one-dimensional direction, so that light is scattered to both sides of the curved surface; when the upper surface of the convex structure 101 is When it is a spherical curved surface and a plurality of convex structures 101 are in a two-dimensional matrix array, refraction occurs in a two-dimensional plane, so that light is scattered to various angles of the two-dimensional plane, so that each angle of view can present better image quality.

As shown in FIG. 2, the support protective film 100 may have a light incident surface and a light emitting surface, and the light emitting surface and the light incident surface may be rectangles having the same shape and size, or may have other shapes. When the upper surface of the convex structure 101 is a circular arc surface or a spherical surface, the radius of the circular arc surface or the spherical surface in the first direction is less than or equal to twice the height of the convex structure 101 in the first direction. The direction is the direction perpendicular to the light emitting surface, which can be understood here as the extending direction along the Y axis. In FIG. 2, R is the radius of the curved surface in the first direction, D is the height of the convex structure 101 in the first direction, and the relationship between the radius R and the height D can be expressed as R ≦ 2D, so that the When thin, reduce the curvature radius of the curved surface. The smaller the curvature radius, the more obvious the refraction effect, and the more energy range that can be allocated to a large viewing angle.

Optionally, there may be a gap between two adjacent raised structures, and there may be no gap. Please continue to refer to FIG. 2, when the protruding structure 101 is a strip structure, its cross-section is a left-right symmetrical structure, wherein the second direction is the direction of the extending direction of the vertical strip structure on the light emitting surface, and the second direction can be understood here It is a direction extending along the X axis. Lx is the length of the strip-like protruding structure in the second direction, and Px is the center distance of the strip-like protruding structure in the second direction. The convex structure 101 satisfies in the second direction: Px ≧ Lx and Px ≦ 10 μm, and 10 μm is a wavelength of visible light. When Px> Lx, there is a gap between adjacent convex structures 101. When Px> Lx, that is, the convex structures 101 can be arranged at periodic intervals. When light propagates from light dense to light dense, the interval is equivalent to a grating. The closer the interval is to the wavelength, the easier it is to generate a diffraction phenomenon at the interval between adjacent convex structures 101, and the diffraction will also change the propagation path of the light, make the vertically incident light diverge to the side, and further distribute the energy of the frontal light to Side view, improve the picture quality of side view.

Similarly, when a part of the surface of the convex structure 101 is a spherical curved surface, it can have the same cross-section as a strip structure. Therefore, referring to FIG. 2 and FIG. 3B at the same time, the convex structure 101 having a spherical curved surface The length in the second direction is Lx, Px is the center distance of the convex structure 101 with a spherical curved surface in the second direction, and Py is the center distance of the convex structure 101 with a spherical curved surface in the third direction. Accordingly, Ly (Not shown) is the length of the convex structure 101 with a spherical curved surface in the third direction, preferably Lx = Ly, where the light emitting surface is rectangular, so the direction perpendicular to the light emitting surface is the first direction, and the rectangle is The extension direction of the width is the second direction, and the extension direction of the rectangular length is the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Here, the first direction can be understood as being along the Y axis. Extension direction, the second direction can be understood as the extension direction along the X axis, and the third direction can be understood as the extension direction along the Z axis. Px, Py, Lx, and Ly satisfy: Px ≧ Lx and Px ≦ 10 μm; Py ≧ Ly and Py ≦ 10 μm; 10 μm is the general opening size of a pixel. When Px> Lx, Py> Ly, there are gaps between adjacent convex structures 101, that is, the convex structures 101 are distributed in a two-dimensional matrix array. When light propagates from light dense to light dense, the distance and the surface can be used to make The vertically incident light diverges towards the side, further distributes the energy of the frontal light to the side viewing angle, and improves the image quality of the side viewing angle.

It can be understood that the optical compensation film 200 should be made of a transparent or translucent material that can transmit light and has a function of phase compensation. In one embodiment, the optical compensation film 200 is filled with liquid crystal. The liquid crystal is a birefringent material. When the light enters the liquid crystal, it is refracted into two kinds of normal light and abnormal light. The refractive index of the normal light is normal refractive index, which is abnormal. The refractive index of light is an abnormal refractive index. The direction of the abnormal refractive index is the direction in which the direction of the optical electric field is parallel to the optical axis of the liquid crystal. The direction of the normal refractive index is the direction in which the optical field is perpendicular to the optical axis of the liquid crystal. The direction of the abnormal refractive index is perpendicular to the direction of the normal refractive index. . In this embodiment, as shown in FIG. 5A, the optical compensation film 200 is a negative single optical axis C-compensating film, and the negative single optical axis C-compensating film can be filled with the dish-shaped liquid crystal 201, and the light of the dish-shaped liquid crystal 201 The axis is perpendicular to the light incident surface. The direction of the abnormal refractive index nce (extraordinary refractive index) of the dish-shaped liquid crystal 201 is parallel to the optical axis of the dish-shaped liquid crystal, and the direction of normal refractive index nco (ordinary refractive index) of the dish-shaped liquid crystal is perpendicular to the abnormal refractive index. The nce direction, that is, the normal refractive index nco direction of the dish-shaped liquid crystal is parallel to the light incident surface, and nco> nce. The first refractive index of the support protective film 10 is a normal refractive index n, and n> nco. In this embodiment, the second refractive index is a negative single optical axis C-compensating film with a normal refractive index nco, and the direction of n and the direction of nco are both parallel to the light incident surface. As shown in FIG. 5B, the optical compensation film 200 can also be a positive single optical axis A-compensation film. The positive single optical axis A-compensation film can be filled with nematic liquid crystal 202, and the nematic liquid crystal 202 has a long rod shape. Type liquid crystal, the optical axis of the nematic liquid crystal 202 is parallel to the light incident surface, the abnormal refractive index nae direction of the nematic liquid crystal is parallel to the optical axis of the nematic liquid crystal, that is, the abnormal refractive index nae direction of the nematic liquid crystal is The light planes are parallel, the normal refractive index nao direction of the nematic liquid crystal is perpendicular to the abnormal refractive index nae direction, and nae> nao; in this embodiment, the second refractive index is the normal refraction of a positive single optical axis A-compensation film The first refractive index of the supporting protective film 10 is the normal refractive index n, and n> nao, and the direction of n and the direction of nao are both parallel to the light incident surface.

The polarizing film 300 has an absorption axis and a transmission axis, and polarized light having a vibration direction parallel to the transmission axis can pass through the polarizing film 300. In an embodiment, in order to reduce the polarization effect of the phase compensation film on light, the optical axis (optical axis of the liquid crystal) of the optical compensation film 200 can be parallel to the transmission axis of the polarizing film, and the polarization of the incident light after passing through the phase compensation film The direction is parallel to the transmission axis of the polarizing film 300, so it can completely pass through the polarizing film 300. In this solution, since the optical compensation film 100 (positive single optical axis A-compensation film or negative single optical axis C-compensation film) also has the function of phase compensation, the optical compensation film 100 (positive single optical axis A -Compensation film or negative single optical axis C-compensation film) In addition to deflecting incident light at the interface to expand the viewing angle and enhance the quality of the side viewing angle, it can also play a role in phase compensation.

In the exemplary technology, polyvinyl alcohol is usually used as a polarizing film, and polyvinyl alcohol is extremely hydrophilic. In order to protect the physical properties of the polarizing film, a layer of triacetate cellulose is usually required on both sides of the polarizer. Film, cellulose triacetate support film has high light transmittance, good water resistance and certain mechanical strength, and can protect polarizing film. In this embodiment, since the support protective film 100 and the optical compensation film 200 are provided on one side of the polarizing film 300, the support protective film 100 and the optical compensation film 200 can perform phase compensation and deflect light, and can also serve as protection. Layer to protect the polarizing film 300. It should be noted that the supporting protective film 100 and the optical compensation film 200 need to have appropriate thicknesses to achieve the protective effect on the polarizing film 300.

Please continue to refer to FIG. 4A and FIG. 4B. It is a schematic structural diagram and a three-dimensional structural diagram of the supporting protective film 100 in another embodiment. A plurality of convex structures 101 are formed on the light-exiting surface of the supporting protective film 100. The plurality of convex structures 101 are strip-shaped structures and part of the surface of the strip-shaped structures are arc-shaped curved surfaces. The plurality of convex structures 101 may be arranged side by side. As shown in FIG. 4B, the protruding structure 101 can be regarded as a fan-shaped strip-shaped protruding structure. The cross-sectional shape parallel to the paper surface is a fan-shaped shape. One side of the fan-shaped structure is R. The distance in the second direction is Px, and the height of the fan-shaped convex structure 101 in the first direction is D. The relationship between D and R satisfies the relationship described in the previous embodiment, and Px is less than or equal to 10 μm. Here, R can also be regarded as Is the length of the convex structure 101 along the second direction. In this embodiment, the convex structure 101 has both an inclined surface and a curved surface, so when the incident light R0 is refracted, a plurality of different refractions can be obtained. Angle, so that the outgoing light ray R1 is emitted in all directions, so that the light energy of the positive viewing angle is more evenly distributed to the side viewing angle. It can be understood that the difference between this embodiment and the foregoing embodiment of the arc-shaped curved surface is only in the shape, and the specific viewing angle diffusion principle, refractive index, and size representation are the same as the description of the foregoing arc-shaped curved surface, and this embodiment is convex The first refractive index of the structure 101 is greater than the second refractive index of the second compensation film, so that it is possible to ensure that the light that is incident vertically is from the light dense medium to the light sparse medium, and cooperates with the unique convex structure to make the light diffuse. . Correspondingly, a part of the surface of the convex structure 101 may also be a spherical curved surface, and the convex structure 101 may be distributed in a dot-like array (two-dimensional matrix array) on the light emitting surface.

As shown in FIG. 6, in the polarizing plate 10, a compensation film 400 and an anti-glare film 500 may be sequentially stacked on the light-emitting side of the polarizing film 300, and a light-sensitive surface 500 of the compensation film 400 is covered with a laminated sensitive adhesive layer 500. The polarizing plate 10 is adhered to a glass substrate through a pressure-sensitive adhesive layer 600.

A polarizing plate is also provided. The polarizing plate includes a supporting protective film having a first refractive index. The supporting protective film has a light incident surface and a light emitting surface. The light emitting surface is provided with a plurality of convex structures having a predetermined shape. At least part of the surface of the structure is a curved surface, and the angle formed by the curved surface and the light incident surface is an acute angle. An optical compensation film is formed on the light emitting surface. The optical compensation film has a second refractive index, and the first refractive index is larger than the first refractive index. The birefringence, optical compensation film is provided with a plurality of grooves having the same shape and size as the convex structure on the surface in contact with the support and protection film; a polarizing film is provided on the optical compensation film.

In the above embodiment, by providing a convex structure with a curved surface in the supporting protective film, and at the same time, according to the refractive effect caused by the refractive index different from the optical compensation film, the incident light perpendicular to the supporting protective film can be refracted, thereby The light energy of the positive viewing angle is distributed to the side viewing angle, thereby solving the problem of color cast. In addition, since no additional metal wiring is used in the entire polarizing plate, there is no problem that affects the transmittance of light and further affects the image quality.

The present application also discloses a display device. As shown in FIG. 7, the display device includes a backlight module 5 and a display panel 1 disposed above the backlight module. The backlight module 5 is used to provide incident light R0 (not labeled in FIG. 7). The incident light R0 is incident on the display panel 1 in a concentrated manner. The divergent direction of the incident light R0 is at a small angle with the direction perpendicular to the display panel 1. Less than 30 °, most of the light received by the display panel 1 is normal incident light. Since the support protective film 100 and the optical compensation film 200 exist in the display panel 1 and the light-emitting surface of the support protective film 100 is provided with a plurality of convex shapes having a predetermined shape. The lifting structure 101 can deflect the normal incident light to produce outgoing light R1 by refraction on the surface of the protruding structure 101, thereby allocating the positive viewing angle energy to the side viewing angle and improving the image quality of the side viewing angle. The backlight module 5 may include a side-type LED light source 51, a reflection sheet 52, and a light guide plate 53. The upper and lower surfaces of the light guide plate 53 are provided with long V-shaped grooves. The side walls of the V-shaped grooves on the lower surface of the light guide plate 53 are parallel to the side-type light source 51, and the V-shaped grooves on the upper surface of the light guide plate 53 and the V-shaped grooves on the lower surface. Set up perpendicular to each other.

Please refer to FIG. 8, which is a schematic diagram of the composition of the display panel in FIG. 7. The display panel 1 may be, for example, a TFT-LCD (Thin Film Transistor Liquid Crystal Displayer) display panel 1, an OLED (Organic Light-Emitting Diode) display panel 1, or a QLED (Quantum Dot Light Emitting Diodes). , Quantum dot light emitting diode) display panel 1, curved display panel 1 or other display panel 1. This application uses the display panel 1 as a TFT-LCD display panel 1 as an example for description. As shown in FIG. 8, the display panel 1 includes an upper polarizing plate 1000, a lower polarizing plate 2000, an upper substrate 3000, a lower substrate 4000, and a sandwiching substrate. In the liquid crystal layer 6000 between the upper substrate 3000 and the lower substrate 4000, the incident order of light in the display panel 1 is: first enter the lower polarizing plate 2000, then pass through the lower substrate 4000, then pass through the liquid crystal layer 6000, and enter after rotating through the liquid crystal layer 6000 Enter the upper substrate 3000, and finally enter the upper polarizing plate 1000. The lower polarizing plate 2000 is the polarizing plate 10 described in the foregoing embodiment. It can be understood that the upper polarizing plate 2000 may also be the polarizing plate 10 described in the foregoing embodiment. Here, the following polarizing plate 2000 is the polarizing plate 10 described in the foregoing embodiment as an example. The lower polarizing plate 2000 may include a supporting protective film 100 for supporting protection. The film 100 has a first refractive index, and the support and protection film 100 has a light incident surface and a light emitting surface, and a plurality of convex structures 101 having a predetermined shape are provided on the light emitting surface. The convex structure 101 has at least a part of the surface and the light incident surface. The formed angle is an acute angle; the lower polarizing plate 2000 further includes an optical compensation film 200 formed on the light exit surface of the support and protection film 100. The optical compensation film 200 has a second refractive index, and the first refractive index is greater than the second refractive index; The plate 2000 further includes a polarizing film 300 provided on the optical compensation film 200. Light enters from the support protective film 100 and penetrates the support protective film 100 into the optical compensation film 200. The optical compensation film 200 can phase compensate the incident light. Because light enters from light dense to light dense, and the incident angle of incident light on at least part of the contact surface is not equal to 90 °, a refraction phenomenon occurs, which deflects normal incident light to a side viewing angle, and distributes positive viewing angle energy to the side viewing angle. To improve the quality of the side view. The specific structure of the polarizing plate 10 has been described in detail above, and is not repeated here.

The technical features of the embodiments described above can be arbitrarily combined. In order to simplify the description, all possible combinations of the technical features in the above embodiments have not been described. However, as long as there is no contradiction in the combination of these technical features, It should be considered as the scope described in this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and their descriptions are more specific and detailed, but they cannot be understood as a limitation on the scope of patent application. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of this application patent shall be subject to the appended claims.

Claims

A polarizing plate includes:

A support protective film having a first refractive index, the support protective film having a light incident surface and a light emitting surface, and a plurality of convex structures having a preset shape are provided on the light emitting surface, and the convex An angle formed by at least a part of the surface of the lifting structure and the light incident surface is an acute angle;

An optical compensation film is formed on the light emitting surface, the optical compensation film has a second refractive index, the first refractive index is greater than the second refractive index, and the optical compensation film is in contact with the support and protection film A plurality of grooves having the same shape and size as the convex structure are formed on the surface; and

A polarizing film is provided on the optical compensation film.
The polarizing plate according to claim 1, wherein the convex structure is a strip structure and a part of the surface of the strip structure is a circular arc surface, and a plurality of the strip structures are arranged side by side.
The polarizing plate according to claim 1, wherein a part of the surface of the convex structure is a spherical curved surface, and a plurality of the convex structures are distributed in a two-dimensional matrix array on the light emitting surface.
The polarizing plate of claim 2, wherein a radius of the circular curved surface is less than or equal to twice a height of the strip structure in the first direction;

The center-to-center distance between adjacent strip structures is greater than or equal to the length of the strip structures in the second direction, and is less than or equal to 10 μm;

Wherein, a direction perpendicular to the light emitting surface is a first direction, and a direction perpendicular to the extending direction of the strip structure on the light emitting surface is a second direction.
The polarizing plate according to claim 3, wherein the light emitting surface is rectangular, and the radius of the spherical curved surface is less than or equal to twice the height of the convex structure in the first direction;

The center-to-center distance between adjacent protruding structures is greater than or equal to the length of the protruding structures in the second direction, and is less than or equal to 10 μm;

The center-to-center distance of the adjacent protruding structures is greater than or equal to the length of the protruding structures in the third direction and is less than or equal to 10 μm;

The direction perpendicular to the light emitting surface is the first direction, the extending direction of the rectangular width is the second direction, and the extending direction of the rectangular length is the third direction. The first direction, the second direction, The third direction is perpendicular to each other.
The polarizing plate according to claim 1, wherein the optical compensation film is a positive single optical axis A-compensation film, and the first refractive index is a normal refractive index of the positive single optical axis A-compensation film. The positive single optical axis A-compensation film includes nematic liquid crystal molecules, and the optical axis of the nematic liquid crystal molecules is parallel to the light incident surface.
The polarizing plate according to claim 1, wherein the optical compensation film is a negative single optical axis C-compensation film, and the second refractive index is a normal refractive index of the negative single optical axis C-compensation film. The negative single optical axis C-compensation film includes a dish-shaped liquid crystal molecule, and an optical axis of the dish-shaped liquid crystal molecule is perpendicular to the light incident surface.
The polarizing plate according to claim 7, wherein the polarizing film has a transmission axis, light having a polarization direction parallel to the transmission axis can pass through the polarizing film, and the negative uniaxial C-compensation film The optical axis is perpendicular to the penetration axis.
The polarizing plate according to claim 1, wherein the value of the first refractive index ranges from 1.0 to 2.5.
The polarizing plate according to claim 1, wherein the value of the second refractive index ranges from 1.0 to 2.5.
The polarizing plate of claim 1, wherein a difference between the first refractive index and the second refractive index ranges from 0.01 to 1.5.
The polarizing plate of claim 1, wherein the polarizing film comprises a polyvinyl alcohol film.
The polarizing plate according to claim 1, wherein the polarizing plate further comprises a compensation film provided on the polarizing film.
The polarizing plate according to claim 13, wherein the polarizing plate further comprises a pressure-sensitive adhesive layer provided on the compensation film.
A polarizing plate includes:

A support protective film having a first refractive index, the support protective film having a light incident surface and a light emitting surface, and a plurality of convex structures having a preset shape are provided on the light emitting surface, and the convex At least part of the surface of the lifting structure is a circular arc surface, and an angle formed by the circular arc surface and the light incident surface is an acute angle;

An optical compensation film is formed on the light emitting surface, the optical compensation film has a second refractive index, the first refractive index is greater than the second refractive index, and the optical compensation film is in contact with the support and protection film A plurality of grooves having the same shape and size as the convex structure are formed on the surface;

The optical compensation film is a positive single optical axis A-compensation film, the first refractive index is a normal refractive index of the positive single optical axis A-compensation film, and the positive single optical axis A-compensation film Containing nematic liquid crystal molecules, the optical axis of the nematic liquid crystal molecules is parallel to the light incident surface; and

A polarizing film is provided on the optical compensation film.
A display device includes:

Backlight module for providing a light source; and

A display panel placed on one side of the backlight module for displaying a picture;

The display panel includes a polarizing plate, and the polarizing plate includes:

A support protective film having a first refractive index, the support protective film having a light incident surface and a light emitting surface, and a plurality of convex structures having a preset shape are provided on the light emitting surface, and the convex An angle formed by at least a part of the surface of the lifting structure and the light incident surface is an acute angle;

An optical compensation film is formed on the light emitting surface, the optical compensation film has a second refractive index, the first refractive index is greater than the second refractive index, and the optical compensation film is in contact with the support and protection film A plurality of grooves having the same shape and size as the convex structure are formed on the surface; and

A polarizing film is provided on the optical compensation film.
The display device according to claim 16, wherein the backlight module comprises:

light source;

Reflectors; and

Light guide plate; wherein the upper and lower surfaces of the light guide plate are provided with V-shaped grooves, and the V-shaped grooves on the upper surface of the light guide plate and the V-shaped grooves on the lower surface of the light guide plate are Set in a mutually perpendicular manner.
The display device according to claim 17, wherein the light source is an edge-type light source, and a side wall of the V-shaped strip groove on the lower surface of the light guide plate is parallel to the edge-type light source.
The display device according to claim 16, wherein the display panel is a liquid crystal display panel.
The display device according to claim 16, wherein the display panel is an organic electroluminescence display panel.