WO2020062559A1

WO2020062559A1 - Polarizer structure and display device

Info

Publication number: WO2020062559A1
Application number: PCT/CN2018/119258
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: 2018-12-05
Publication date: 2020-04-02
Also published as: CN109031501A

Abstract

The present application relates to a polarizer structure and a display device, comprising a polarizer film, a first optical compensation film and a second optical compensation film that are sequentially stacked on top of one another. The first optical compensation film is formed with a plurality of recesses, and the second optical compensation film is formed with protrusions matching the recesses, each protrusion being accommodated in the corresponding recess. The width of the protrusion is less than or approximates the wavelength of the incident light, and the refractive index of the first optical compensation film is greater than that of the second optical compensation film.

Description

Polarizing structure and display device

Related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on September 30, 2018, with application number 201811161965.3 and application name "Polarized Structure, Display Panel, and Display Device", the entire contents of which are incorporated herein by reference. Applying.

Technical field

The present application relates to the field of display, and in particular to a polarizing structure 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 in such electronic products due to 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 the 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.

Summary of the Invention

A polarizing structure is provided according to various embodiments of the present application.

A polarizing structure includes:

A polarizing film having a light incident surface and a light emitting surface opposite to the light incident surface;

A first optical compensation film is provided on the light emitting surface of the polarizing film, the first optical compensation film has a first refractive index, and a surface of the first optical compensation film facing away from the light emitting surface of the polarizing film is formed Multiple grooves; and

A second optical compensation film is formed with a plurality of convex structures that match the shape and size of the groove, and the width of each of the convex structures is less than or close to the wavelength of incident light, and the second optical compensation film is bonded. On the first optical compensation film, and each of the convex structures is received in the corresponding groove, the second optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index Refractive index.

Since in display devices, most of the light is incident perpendicularly to the polarizing structure, if the surface of each layer of the polarizing structure is flat and perpendicular to the perpendicularly incident light, most of the incident light is perpendicularly emitted when it enters the polarizing structure vertically, which makes large Part of the light energy is concentrated in the positive viewing angle, which results in a good display image quality in the front viewing angle and poor image quality in the side viewing angle. In this solution, because the first optical compensation film and the second optical compensation film are provided, and the first refractive index is greater than the second refractive index, that is, when light enters the polarized structure vertically, it penetrates the first optical compensation film and is incident on The process of the second optical compensation film is a process from the light dense to the light dense. At the same time, a plurality of convex structures are formed on the side of the second optical compensation film that is in contact with the first optical compensation film. The width of each convex structure is smaller than or close to the wavelength of the incident light. At this time, the convex structure is equivalent to a grating, and the light incident on the convex structure will be diffracted, thereby changing the propagation path of the light, dispersing the vertically incident light to the side viewing angle, and improving the image quality of the side viewing angle.

In one embodiment, a width of each of the protruding structures is greater than or equal to 300 nm and less than or equal to 1000 nm.

In one embodiment, each of the convex structures is an elongated convex structure, and the elongated convex structures are arranged side by side.

In one embodiment, each of the convex structures is arranged in a two-dimensional matrix array, and the length and width of each of the convex structures are both smaller than or close to the wavelength of incident light.

In one embodiment, each of the convex structures is a rectangular parallelepiped convex structure.

In one of the embodiments, the polarizing film has a transmission axis, the first optical compensation film is a first single optical axis A-compensation film, and the optical axis of the first single optical axis A-compensation film is The transmission axis is parallel, the first refractive index is an abnormal refractive index of the first single optical axis A-compensation film, the second optical compensation film is a single optical axis C-compensation film, and the single optical axis The optical axis of the C-compensation film is perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the single optical axis C-compensation film.

In one embodiment, the polarizing film has a transmission axis, the first optical compensation film is a first single optical axis A-compensation film, and the second optical compensation film is a second single optical axis A-compensation film An optical axis of the first single optical axis A-compensation film is parallel to the transmission axis, the first refractive index is an abnormal refractive index of the first single optical axis A-compensation film, and the second The optical axis of the single optical axis A-compensation film is perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the second single optical axis A-compensation film.

In one embodiment, the second optical compensation film is doped with resin particles having anti-glare function.

In one embodiment, a first supporting film is further provided between the first optical compensation film and the polarizing film.

In one of the embodiments, the first support film includes a polyethylene terephthalate support film.

In one embodiment, the first support film includes a polymethyl methacrylate support film.

In one embodiment, the first support film includes a triacetyl cellulose support film.

In one embodiment, the first refractive index is greater than 1.0 and less than 2.5.

According to various embodiments of the present application, another polarizing structure is provided.

A polarizing structure includes:

A polarizing film having a transmission axis, the polarizing film having a light incident surface and a light emitting surface opposite to the light incident surface;

A first optical compensation film, the first optical compensation film is a first single optical axis A-compensation film, and the first single optical axis A-compensation film is disposed on the light emitting surface of the polarizing film, the A first single optical axis A-compensation film has an abnormal refractive index, an optical axis of the first single optical axis A-compensation film is parallel to the penetration axis, and the first single optical axis A-compensation film faces away from the A plurality of grooves are formed on one side of the light emitting surface of the polarizing film; and

A second optical compensation film, the second optical compensation film is a single optical axis C-compensation film, and the single optical axis C-compensation film is formed with a plurality of convex structures matching the shape and size of the groove, Each of the convex structures is arranged in a two-dimensional matrix array, and the length and width of each of the convex structures are less than or close to the wavelength of incident light, and the single optical axis C-compensation film is attached to the first single light. The single optical axis C-compensating film has a normal refractive index, and the optical axis of the single optical axis C-compensating film is on The transmission axis is perpendicular, and the abnormal refractive index of the first single optical axis A-compensation film is larger than the normal refractive index of the single optical axis C-compensation film.

The above-mentioned polarizing structure can deflect most of the light incident perpendicularly to the display panel toward the side viewing angle in a two-dimensional plane, and distributes the energy of the positive viewing angle to the side viewing angle, thereby improving the image quality of the side viewing angle.

A display device is provided according to various embodiments of the present application.

A display device includes:

A backlight module configured to provide a light source; and

A display panel is placed on one side of the backlight module and is set as a display screen;

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

A first optical compensation film is provided on a light emitting surface of the polarizing film, the first optical compensation film has a first refractive index, and a surface of the first optical compensation film facing away from the light emitting surface of the polarizing film is formed Has multiple grooves; and

A second optical compensation film is formed with a plurality of convex structures that match the shape and size of the groove, and the width of each of the convex structures is smaller than or close to the wavelength of incident light, and the second optical compensation film is bonded. On the first optical compensation film, and each of the convex structures is received in the corresponding groove, the second optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index Refractive index.

In one embodiment, the display panel is a liquid crystal display panel.

In one embodiment, the display panel includes:

A first substrate having a light incident side and a light outgoing side;

A second substrate, which is located on the light emitting side of the first substrate and is opposite to the first substrate;

A first polarizing plate formed on a side of the first substrate facing away from the second substrate, the first polarizing plate including the polarizing structure; and

A second polarizing plate is formed on a side of the second substrate facing away from the first substrate.

In one embodiment, the display panel includes:

A first substrate having a light incident side and a light outgoing side;

A first polarizing plate formed on a side of the first substrate facing away from the second substrate; and

A second polarizing plate is formed on a side of the second substrate facing away from the first substrate, and the second polarizing plate includes the polarizing structure.

In one embodiment, the display panel includes:

A first substrate having a light incident side and a light outgoing side;

The display panel of the above display device includes a polarizing structure, which can deflect the light perpendicularly incident on the display panel to the side viewing angle and distribute the energy of the positive viewing angle to the side viewing angle, thereby improving the image quality of the side viewing angle.

Details of one or more embodiments of the present application are set forth in the accompanying drawings and description below. Other features, objects, and advantages of the application will become apparent from the description, the drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to better describe and illustrate embodiments and / or examples of those inventions disclosed herein, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and / or examples, and the best mode of these inventions as currently understood.

Figure 1 is an exploded view of a polarized structure;

2 is a schematic diagram of diffraction of incident light by a polarizing structure;

3A is a perspective structural view of a second optical compensation film in an embodiment;

3B is a schematic perspective view of a second optical compensation film in another embodiment;

4 is a partial cross-sectional view of a polarizing structure in an embodiment;

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

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

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

8 is a schematic structural diagram of a display panel according to an embodiment;

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

FIG. 10 is a schematic structural diagram of a second polarizing plate in an embodiment.

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. Preferred embodiments of the present application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

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 herein in the specification of the present application is for the purpose of describing specific embodiments only and is not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

In order to thoroughly understand the present application, detailed steps and structures will be provided in the following description in order to explain the technical solution proposed in the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may have other implementations.

In an embodiment, as shown in FIG. 1, the polarizing structure includes a polarizing film 100, a first optical compensation film 200, and a second optical compensation film 300 stacked in this order. The polarizing film 100 has a light incident surface 100A and a light emitting surface. 100B, the light incident surface 100A is a side that receives incident light, and the light enters the polarizing film 100 from the light incident surface 100A to perform polarization processing of the light to form linearly polarized light and exit from the light emitting surface 100B. In one embodiment, the polarizing film 100 is a polyvinyl alcohol film. The polyvinyl alcohol film has high transparency, high elongation performance, and has a polarizing effect on light. The first optical compensation film 200 is stacked on the light exit surface 100B of the polarizing film 100, and the first optical compensation film 200 is formed with a plurality of grooves 201 on a side facing away from the polarizing film 100. The second optical compensation film 300 is formed with a plurality of convex structures 301 that match the shape and size of the groove 201. Each convex structure 301 can be embedded in the corresponding groove 201. The width of each convex structure 301 is smaller than or close to the incident angle. Wavelength of light, the second optical compensation film 300 is attached to the first optical compensation film 200, and each convex structure 301 is completely contained in the corresponding groove 201, that is, the first optical compensation film 200 and the second optical compensation film 300 Tight fit without gaps. The first optical compensation film 200 has a first refractive index n1, the second optical compensation film 300 has a second refractive index n2, and the first refractive index n1 is larger than the second refractive index n2. When light penetrates the first optical compensation film 200 and enters the second optical compensation film 300, it is a process of entering from the light dense to the light dense, and because the width of the convex structure 301 is less than or close to the wavelength of the incident light, when the incident light When propagating to the protruding structure 301, the protruding structure 301 is equivalent to a grating, and light may be diffracted at the protruding structure 301.

In the display device, since most of the light is incident perpendicularly into the polarizing plate, that is, most of the light is perpendicular to the light incident surface 100A, in this solution, a first optical compensation film 200 and a second optical compensation film having different refractive indexes are provided. 300, and a convex structure 301 is formed on a side of the second optical compensation film 300 that is in contact with the first optical compensation film 200. A grating is formed by the convex structure 301, and incident light is incident perpendicularly from the first optical compensation film 200 to the second optical When the compensation film 300 is diffracted at each convex structure 301, the propagation path of the vertically incident light is changed, and the light is deflected, so that the light energy of the normal viewing angle is distributed to the large viewing angle, and the image quality of the side viewing angle is improved.

As shown in FIG. 2, the width of each convex structure 301 is X, and the value of X may be 300 nm ≦ X ≦ 1000 nm. When light vertically penetrates the first optical compensation film 200 and enters the second optical compensation film 300, the Diffraction occurs at each raised structure 301, that is, the light propagation path is changed, and the light deviates from the original perpendicular incident direction and diverges to the side. Therefore, more light enters the side and improves 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 is, the more obvious the diffraction phenomenon is, 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 <n2 <2.5. In one embodiment, if m = n1-n2, the value range of m can be 0.01 <m <1.5.

As shown in FIG. 3A, a plurality of convex structures 301 are formed on the second optical compensation film 300. Each of the convex structures 301 is an elongated convex structure, and each of the elongated convex structures 301 can be arranged side by side. The width of the convex structure 301 is smaller than or close to the wavelength of the incident light. As shown in FIG. 3B, each convex structure 301 may also be arranged in a two-dimensional matrix array, and the width (X direction) and length (Y direction) of each convex structure 301 are both smaller than or close to the wavelength of incident light. Because in the display device, most of the light generated by the backlight module is concentrated and incident perpendicularly to the polarizing structure. If the surface of each optical film of the polarizing structure is flat and perpendicular to the normal incident light, the normal incident light will not change when it penetrates the polarizing structure. Its propagation direction, that is, the light is still emitted perpendicularly when it is incident perpendicularly, causes the light to be concentrated at the front view angle, which makes the display quality of the front view direction better, and the side view angle is poor due to the weak light. In this embodiment, since a plurality of convex structures 301 are provided, each of the convex structures 301 can diffract the normal incident light, and the light deviates from the original normal incident direction and diverges to the side, so more light enters Side, improve the quality of the side view angle. When the convex structures 301 are elongated convex structures and are arranged side by side, diffraction occurs only in one dimension (X direction), so that light is scattered to both sides of each convex structure 301; when each convex structure 301 is When the two-dimensional rectangular array is arranged, since the length and width of each convex structure 301 are smaller than or close to the wavelength of incident light, diffraction occurs in a two-dimensional plane (X direction and Y direction). In some embodiments, each convex structure 301 is a rectangular parallelepiped convex structure. In other embodiments, each convex structure 301 may also be another form of convex structure. The size of each convex structure 301 can make the incident Diffraction of light is sufficient.

In one embodiment, the convex structures 301 are arranged periodically, that is, the diffraction grating constructed by the convex structures 301 is arranged periodically, which is advantageous for modulating the light waves. In an embodiment, the center-to-center distance between adjacent convex structures 301 is less than or equal to 10 μm, that is, smaller than the opening width of a general pixel, that is, each pixel opening corresponds to at least one convex structure 301 to deflect light from the pixel.

The polarizing film 100 has an absorption axis and a transmission axis, and polarized light having an electric field direction parallel to the transmission axis can pass through the polarizing film 100. In this embodiment, the first optical compensation film 200 and the second optical compensation film 300 should be made of a transparent or translucent material that can transmit light and have the function of optical compensation. The optical compensation may specifically be phase compensation. In one embodiment, the first optical compensation film 200 and the second optical compensation film 300 are filled with liquid crystal. Liquid crystal is a birefringent material. Generally, when light enters the liquid crystal, it is refracted into two rays: normal light and abnormal light. Among them, the refractive index of normal light is normal refractive index, the refractive index of abnormal light is abnormal refractive index, and the direction of abnormal refraction is The direction of the optical electric field is parallel to the optical axis of the liquid crystal. The normal refraction direction is the direction in which the optical electric field is perpendicular to the optical axis of the liquid crystal. The abnormal refraction direction is perpendicular to the normal refraction direction.

In an embodiment, as shown in FIG. 4, the first optical compensation film 200 is a first single optical axis A-compensation film. The first single optical axis A-compensation film may be filled with a nematic liquid crystal 202 and a nematic phase. The liquid crystal 202 is a long rod-shaped liquid crystal. The optical axis of the nematic liquid crystal 202 is parallel to the light incident surface 100A and parallel to the transmission axis of the polarizing film 100. The abnormal refraction direction of the nematic liquid crystal is the direction of the optical electric field and the nematic phase. the optical axis of the liquid crystal parallel, namely the nematic liquid crystal 202 anomalous refractive optical field direction parallel to the transmission axis of the polarizing film 100, corresponding to the extraordinary refractive index is n1 _e; a second optical compensation film 300 is a single optical axis C -Compensation film, single optical axis C- The compensation film can be filled with dish-shaped liquid crystal 302. The optical axis of the dish-shaped liquid crystal 302 is perpendicular to the light incident surface 100A. The normal refraction direction of the dish-shaped liquid crystal is the direction of the optical electric field and the light of the dish-shaped liquid crystal 302. The directions perpendicular to the axis, that is, the direction of the optical field of normal refraction of the dish-shaped liquid crystal 302 may be various directions parallel to the light incident surface 100A, and the corresponding normal refractive index is n2 _o . In this embodiment, the first refractive index is the abnormal refractive index n1 _e of the A-compensation film, and the second refractive index is the normal refractive index n2 _o of the C-compensation film. After the polarization of the polarizing film 100, the light becomes linearly polarized light. The direction of the electric field of the linearly polarized light is parallel to the transmission axis. After passing through the first optical compensation film 200, the direction of the electric field of the linearly polarized light is the same as that of the first optical compensation film 200. The optical axis is parallel, so only anomalous refraction occurs in the first optical compensation film 200. The first refractive index is selected from the abnormal refractive index of the first optical compensation film 200, and then passes through the second optical compensation film 300. The electric field direction of the linearly polarized light behind the film 200 is still parallel to the transmission axis of the polarizing film 100 and perpendicular to the optical axis of the second optical compensation film 300, so only normal refraction occurs in the second optical compensation film 300, and the second refraction occurs The normal refractive index of the second optical compensation film 300 is selected. Because the phase retardation phenomenon occurs after the light is processed, in this embodiment, when the refractive index of the single optical axis A-compensation film and the single optical axis C-compensation film are different to deflect the normal incident light, the single The optical axis A-compensation film and the single optical axis C-compensation film also constitute a dual optical axis phase compensation film, which can perform phase compensation on light and avoid the effect of phase delay on the image quality.

In another embodiment, as shown in FIG. 5, the first optical compensation film 200 is a first single optical axis A-compensation film, and the first single optical axis A-compensation film may be filled with nematic liquid crystal 202 and nematic The optical axis of the phase liquid crystal 202 is parallel to the light incident surface 100A and parallel to the transmission axis of the polarizing film 100. The anomalous refraction direction of the nematic liquid crystal 202 is the direction of the optical electric field parallel to the optical axis of the nematic liquid crystal 202, that is, optical field transmission axis direction of polarizing the nematic liquid crystal 202 parallel abnormal refraction 100, corresponding to the extraordinary refractive index is n1 _e; a second optical compensation film 300 A- second uniaxial compensation film, a second single The optical axis A-compensation film can be filled with nematic liquid crystal 303, and the optical axis of the nematic liquid crystal 303 is perpendicular to the transmission axis. The normal refraction direction of the nematic liquid crystal 303 is the direction of the optical electric field and the nematic liquid crystal 303. a direction perpendicular to the optical axis, namely the column direction of the transmission axis of the polarizing film 100 of the optical field phase liquid crystal 303 parallel to the normal refraction, a refractive index corresponding to the normal n1 _o. The abnormal refractive index of the single optical axis A-compensation film is larger than its normal refractive index, that is, n1 _e > n1 _o . The process of light passing from the first single optical axis compensation film into the second single optical axis compensation film is a process in which the light dense substance enters the light phosgene.

In an embodiment, as shown in FIG. 6, a first support film 800 is further provided between the first optical compensation film 200 and the polarizing film 100. The first support film 800 may be a triacetate cellulose (TAC) support film. It can also be a polyethylene terephthalate (PET) support film, or a polymethyl methacrylate (PMMA) support film. In the polarizing structure, polyvinyl alcohol is generally used as the polarizing film 100, and polyvinyl alcohol has extremely strong hydrophilicity. The first supporting film 800 is provided to protect the physical characteristics of the polarizing film 100. In another embodiment, the first optical compensation film 200 is directly attached to the light emitting surface 100B of the polarizing film 100, that is, there is no first support film provided between the first optical compensation film 200 and the polarizing film 100. One side of 100 is provided with a first optical compensation film 200 and a second optical compensation film 300. The first optical compensation film 200 and the second optical compensation film 300 can both deflect light and serve as a protective layer to protect the polarizing film 100. Therefore, the first supporting film on the light emitting side of the polarizing film 100 can be omitted in the polarizing structure, which is beneficial to the thin design of the product. It should be noted that the first optical compensation film 200 and the second optical compensation film 300 need to have appropriate thicknesses to achieve the protective effect on the polarizing film 100.

The polarizing structure is specifically located in the polarizing plate and is the core component of the polarizing plate. The polarizing plate specifically polarizes the light through the polarizing structure. The polarizing plate is integrated in the display panel. The polarizing plate located on the display screen side of the display panel is the second polarizing plate, and the polarizing plate located on the other side of the display panel facing away from the display screen is the first polarizing plate. Light is incident on the display. In the case of a panel, the polarizing treatment of the first polarizing plate is performed first, and then the second polarizing plate is passed through and emitted. In an embodiment, as shown in FIG. 4, the above-mentioned polarizing structure may be located in the second polarizing plate. The second optical compensation film 300 may be doped with resin particles 304 having anti-glare function, without increasing polarized light. The thickness of the panel can reduce the light reflection phenomenon of the display panel and improve the user experience.

This application also discloses another polarizing structure. As shown in FIGS. 1, 3B, and 4, the polarizing structure includes a polarizing film 100, a first single optical axis A-compensation film, and a single optical axis C- The compensation film; wherein the polarizing film 100 has a transmission axis, the polarizing film 100 has a light incident surface 100A and a light emitting surface 100B; a first single optical axis A-compensation film is stacked on the light emitting surface 100B of the polarizing film 100, the first single The optical axis A-compensation film has an abnormal refractive index. The optical axis of the first single optical axis A-compensation film is parallel to the transmission axis. The first single optical axis A-compensation film is formed with a plurality of recesses on the side facing away from the polarizing film 100. Slot 201; the single optical axis C-compensation film is formed with a plurality of convex structures 301 that match the shape and size of the grooves, and each convex structure 301 is arranged in a two-dimensional matrix array, and each convex structure 301 can be just embedded in the corresponding concave In the groove 201, the length and width of each convex structure 301 are smaller than or close to the wavelength of incident light. The single optical axis C-compensation film has a normal refractive index, and the optical axis of the single optical axis C-compensation film is perpendicular to the transmission axis. The abnormal refractive index of a single optical axis A-compensation film is greater than the normal refractive index of a single optical axis C-compensation film.

The incident light passes through the polarizing film 100 to form linearly polarized light, and the direction of the optical electric field of the linearly polarized light is parallel to the transmission axis of the polarizing film 100. After the linearly polarized light enters the first single optical axis A-compensation film, the linearly polarized light enters the first single optical axis A-compensation film because the optical axis of the first single optical axis A compensation film is parallel to the transmission axis. , The corresponding refractive index is the abnormal refractive index of the single optical axis A-compensation film. Linearly polarized light penetrates the first single optical axis A-compensation film and enters the single optical axis C-compensation film. Because the optical axis of the single optical axis C-compensation film is perpendicular to the transmission axis, linearly polarized light enters the single optical axis C- The compensation film only undergoes normal refraction, and the corresponding refractive index is the normal refractive index of a single optical axis C-compensation film. Because the abnormal refractive index of the single optical axis A-compensation film is larger than the normal refractive index of the single optical axis C-compensation film, when light penetrates the first single optical axis A-compensation film and enters the single optical axis C-compensation film, it is from During the process of the light denseness entering the photophosgene, because the length and width of each convex structure 301 are less than or close to the wavelength of the incident light, when the incident light propagates to each convex structure 301, the convex structure 301 is equivalent to one Grating, light can be diffracted at each convex structure 301, thereby changing the propagation path of vertically incident light, the light is deflected, the light energy of the normal viewing angle is distributed to the large viewing angle, and the image quality of the side viewing angle is improved. In this embodiment, since the convex structures 301 are arranged in a two-dimensional matrix array, light rays are diffracted at various angles in a two-dimensional plane, so that the image quality of each side viewing angle in the two-dimensional plane is improved.

The present application also discloses a display device. As shown in FIG. 7, the display device includes a backlight module 2 and a display panel 1 disposed on one side of the backlight module 1. The display panel 1 includes the polarized structure described above. The backlight module 2 is configured to provide a light source, and the light source generates incident light that is incident on the display panel 1 in a concentrated manner. The divergent direction of the incident light is at a small angle θ with the direction perpendicular to the display panel, and the small angle θ may be less than 30 °. Most of the light received by the display panel 1 is normal incident light. Since the first optical compensation film 200 and the second optical compensation film 300 exist in the display panel 1, the second optical compensation film 300 and the first optical compensation film 200 are present. A convex structure 301 is formed on the contacting side. At each convex structure 301, the normal incident light can be deflected by diffraction, thereby distributing the energy of the positive viewing angle to the side viewing angle and improving the image quality of the side viewing angle. The polarizing structure in the display panel has been described above, and is not repeated here. The backlight module 20 includes a side-type light source 2A and a light guide plate 2B opposite to the side-type light source 2A. The upper and lower surfaces of the light guide plate 2B are provided with long V-shaped grooves, and the lower surface of the light guide plate 2B has a V-shaped groove. The length direction is parallel to the side-type light source 2A, the length direction of the V-shaped groove on the upper surface of the light guide plate 2B is perpendicular to the side-type light source 2A, and the length direction of the V-shaped groove on the upper surface of the light guide plate 2B and the length direction of the V-shaped groove on the lower surface are mutually vertical.

In an embodiment, the display panel includes a first substrate, a second substrate, a first polarizing plate, and a second polarizing plate, wherein the first substrate has a light incident side and a light emitting side, and the second substrate is located on the light emitting side of the first substrate. And disposed opposite to the first substrate, the first polarizing plate is located on a side of the first substrate facing away from the second substrate, the second polarizing plate is located on a side of the second substrate facing away from the first substrate, and the first polarizing plate includes a polarizing structure, Either the second polarizing plate includes a polarizing structure, or both the first polarizing plate and the second polarizing plate include a polarizing structure. The polarizing structure has been described in detail above, and is not repeated here.

In the display panel, light passes through the first polarizing plate, the first substrate, the second substrate, and the second polarizing plate in order, and finally displays a picture. Because the polarizing plate contains a polarizing structure, at the polarizing structure, the light will be refracted, which deflects the normal incident light to the side viewing angle, distributes the energy of the positive viewing angle to the side viewing angle, and improves the image quality of the side viewing angle.

In an embodiment, as shown in FIG. 8, the display panel 1 may be a liquid crystal display panel. The liquid crystal display panel includes a second polarizing plate 10, a first polarizing plate 30, a second substrate 22 supporting the second polarizing plate 10, The first substrate 21 supporting the first polarizing plate 30 and the liquid crystal 23 sandwiched between the first substrate 21 and the second substrate 22, wherein the first substrate 21, the second substrate 22, and the first substrate 21 and the first substrate 21 The liquid crystal 23 in the middle of the two substrates 22 constitutes a liquid crystal layer 20. The incident light passes through the first polarizing plate 30 and becomes linearly polarized light. The liquid crystal layer 20 can reverse the polarization direction of the linearly polarized light and allow the linearly polarized light to pass through the second polarizing plate 10 to display a picture on the display panel 1.

The aforementioned polarizing structure may be located in the second polarizing plate 30 or in the first polarizing plate 10. In an embodiment, as shown in FIG. 9, when the polarizing structure is located on the first polarizing plate 30, the first polarizing plate 30 includes the second polarizing structure, and also includes a second polarizing film attached to the light incident surface 100A of the polarizing film 100. The supporting film 500 and the first pressure-sensitive adhesive layer 400 stacked on the second optical compensation film 300. The first polarizing plate 30 can be pasted on the first substrate 21 through the first pressure-sensitive adhesive layer 400, that is, the first polarizing plate. 30 The direction from the incoming light to the outgoing light may include a second support film 500, a polarizing film 100, a first optical compensation film 200, a second optical compensation film 300, and a first pressure-sensitive adhesive layer 400 stacked in this order. The compensation film 200 may be a first single optical axis A-compensation film, and the second optical compensation film 300 may be a second single optical axis A-compensation film or a single optical axis C-compensation film. The second optical compensation film 300 has a different refractive index and deflects the normal incident light. At the same time, the first optical compensation film 200 and the second optical compensation film 300 also constitute a dual optical axis phase compensation film, which can perform phase compensation on the light and avoid The effect of phase delay on picture quality.

In another embodiment, as shown in FIG. 10, when the polarizing structure is located in the second polarizing plate 10, in addition to the polarizing structure described above, the second polarizing plate 10 may further include a light incident surface 100A stacked on the polarizing film 100. The phase compensation film 600 and the second pressure-sensitive adhesive layer 700 are provided, wherein the phase compensation film 600 is located between the second pressure-sensitive adhesive layer 700 and the polarizing film 100, that is, the direction of the second polarizing plate 10 from the incident light to the outgoing light may include The second pressure-sensitive adhesive layer 700, the phase compensation film 600, the polarizing film 100, the first optical compensation film 200, and the second optical compensation film 300 are sequentially stacked.

In other embodiments, the display panel may also be an organic light-emitting diode (OLED) display panel, a quantum dot light emitting diode (QLED) display panel, or a curved display panel, and the above-mentioned polarized light panel is included. Structure of other display panels.

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 limiting the scope of the invention patent. 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 structure includes:

A polarizing film having a light incident surface and a light emitting surface opposite to the light incident surface;

A first optical compensation film is provided on the light emitting surface of the polarizing film, the first optical compensation film has a first refractive index, and a surface of the first optical compensation film facing away from the light emitting surface of the polarizing film is formed Multiple grooves; and

A second optical compensation film is formed with a plurality of convex structures that match the shape and size of the groove, and the width of each of the convex structures is smaller than or close to the wavelength of incident light, and the second optical compensation film is bonded. On the first optical compensation film, and each of the convex structures is received in the corresponding groove, the second optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index Refractive index.
The polarizing structure according to claim 1, wherein a width of each of the convex structures is greater than or equal to 300 nm and less than or equal to 1000 nm.
The polarizing structure according to claim 1, wherein each of the convex structures is an elongated convex structure, and the elongated convex structures are arranged side by side.
The polarizing structure according to claim 1, wherein each of the convex structures is arranged in a two-dimensional matrix array, and a length and a width of each of the convex structures are less than or close to a wavelength of incident light.
The polarizing structure according to claim 3, wherein each of the convex structures is a rectangular parallelepiped convex structure.
The polarizing structure according to claim 4, wherein each of the convex structures is a rectangular parallelepiped convex structure.
The polarizing structure according to claim 1, wherein the polarizing film has a transmission axis, the first optical compensation film is a first single optical axis A-compensation film, and the first single optical axis A-compensation film The optical axis is parallel to the transmission axis, the first refractive index is an abnormal refractive index of the first single optical axis A-compensation film, and the second optical compensation film is a single optical axis C-compensation film, An optical axis of the single optical axis C-compensation film is perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the single optical axis C-compensation film.
The polarizing structure according to claim 1, wherein the polarizing film has a transmission axis, the first optical compensation film is a first single optical axis A-compensation film, and the second optical compensation film is a second single light Axis A-compensation film, the optical axis of the first single optical axis A-compensation film is parallel to the transmission axis, and the first refractive index is an abnormal refractive index of the first single optical axis A-compensation film The optical axis of the second single optical axis A-compensation film is perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the second single optical axis A-compensation film.
The polarizing structure according to claim 1, wherein the second optical compensation film is doped with resin particles having anti-glare function.
The polarizing structure according to claim 1, wherein a first supporting film is further provided between the first optical compensation film and the polarizing film.
The polarizing structure according to claim 10, wherein the first supporting film comprises a polyethylene terephthalate supporting film.
The polarizing structure according to claim 10, wherein the first supporting film comprises a polymethyl methacrylate supporting film.
The polarizing structure according to claim 10, wherein the first supporting film comprises a triacetyl cellulose supporting film.
The polarizing structure according to claim 1, wherein the first refractive index is greater than 1.0 and less than 2.5.
A polarizing structure includes:

A polarizing film having a transmission axis, the polarizing film having a light incident surface and a light emitting surface opposite to the light incident surface;

A first optical compensation film, the first optical compensation film is a first single optical axis A-compensation film, and the first single optical axis A-compensation film is disposed on the light emitting surface of the polarizing film, the A first single optical axis A-compensation film has an abnormal refractive index, an optical axis of the first single optical axis A-compensation film is parallel to the penetration axis, and the first single optical axis A-compensation film faces away from the A plurality of grooves are formed on one side of the light emitting surface of the polarizing film; and

A second optical compensation film, the second optical compensation film is a single optical axis C-compensation film, and the single optical axis C-compensation film is formed with a plurality of convex structures matching the shape and size of the groove, Each of the convex structures is arranged in a two-dimensional matrix array, and the length and width of each of the convex structures are less than or close to the wavelength of incident light, and the single optical axis C-compensation film is attached to the first single light. The single optical axis C-compensating film has a normal refractive index, and the optical axis of the single optical axis C-compensating film is on The transmission axis is perpendicular, and the abnormal refractive index of the first single optical axis A-compensation film is larger than the normal refractive index of the single optical axis C-compensation film.
A display device includes:

A backlight module configured to provide a light source; and

A display panel is placed on one side of the backlight module and is set as a display screen;

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

A polarizing film having a light incident surface and a light emitting surface opposite to the light incident surface;

A first optical compensation film is provided on a light emitting surface of the polarizing film, the first optical compensation film has a first refractive index, and a surface of the first optical compensation film facing away from the light emitting surface of the polarizing film is formed Has multiple grooves; and

A second optical compensation film is formed with a plurality of convex structures that match the shape and size of the groove, and the width of each of the convex structures is smaller than or close to the wavelength of incident light, and the second optical compensation film is bonded. On the first optical compensation film, and each of the convex structures is received in the corresponding groove, the second optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index Refractive index.
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 comprises:

A first substrate having a light incident side and a light outgoing side;

A second substrate, which is located on the light emitting side of the first substrate and is opposite to the first substrate;

A first polarizing plate formed on a side of the first substrate facing away from the second substrate, the first polarizing plate including the polarizing structure; and

A second polarizing plate is formed on a side of the second substrate facing away from the first substrate.
The display device according to claim 16, wherein the display panel comprises:

A first substrate having a light incident side and a light outgoing side;

A second substrate, which is located on the light emitting side of the first substrate and is opposite to the first substrate;

A first polarizing plate formed on a side of the first substrate facing away from the second substrate; and

A second polarizing plate is formed on a side of the second substrate facing away from the first substrate, and the second polarizing plate includes the polarizing structure.
The display device according to claim 16, wherein the display panel comprises:

A first substrate having a light incident side and a light outgoing side;

A second substrate, which is located on the light emitting side of the first substrate and is opposite to the first substrate;

A first polarizing plate formed on a side of the first substrate facing away from the second substrate, the first polarizing plate including the polarizing structure; and

A second polarizing plate is formed on a side of the second substrate facing away from the first substrate, and the second polarizing plate includes the polarizing structure.