WO2020062558A1

WO2020062558A1 - Polarizing structure and display device

Info

Publication number: WO2020062558A1
Application number: PCT/CN2018/119254
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: CN109164531A

Abstract

Disclosed are a polarizing structure and a display panel. The polarizing structure comprises a support film (100), an optical compensation film (200), a polarizing film (300) and a phase compensation film (400) arranged in a stacked manner and in sequence, wherein the support film (100) comprises a light incident face (100A) and a light emergent face (100B), and the light emergent face (100B) is provided with a plurality of grooves (101); and the optical compensation film (200) is provided with a plurality of protruding structures (201) matching the grooves (101), and each of the protruding structures (201) is accommodated in the corresponding groove (101), a width of each of the protruding structures (201) is less than or close to a wavelength of incident light, and the refractive index of the support film (100) is greater than that of the optical compensation film (200).

Description

Polarizing structure and display device

Related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on September 30, 2018 with an application number of 201811161890.9 and an application name of "Polarized Structure and Display Device", the entire contents of which are incorporated herein by reference.

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 supporting film having a first refractive index, the supporting film having a light incident surface and a light emitting surface opposite to the light incident surface, and a plurality of grooves are formed on the light emitting surface;

An optical compensation film is formed with a plurality of convex structures matching 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 optical compensation film is attached to the support. The light-emitting surface of the film, and each of the convex structures is received in the corresponding groove, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index;

A polarizing film provided on the optical compensation film; and

A phase compensation film is provided on the polarizing film.

Because in display devices, most of the light is incident perpendicularly to the polarizing structure, the polarizing structure includes a polarizing film and a supporting film that supports and protects the polarizing film. If the surface of each layer of the polarizing structure is flat and perpendicular to the normal incident light, most of the When the incident light is perpendicularly incident on the polarizing structure, it is still emitted vertically, and most of the light energy is concentrated in the positive viewing angle, which results in a good quality of the front panel and a poor viewing angle of the display panel. In this solution, a groove is formed on the supporting film of the polarizing structure, and an optical compensation film is stacked on the supporting film. The optical compensation film is formed with a plurality of convex structures matching the grooves, and the optical compensation film is formed. It is closely attached to the support film without gaps. The raised structure is contained in the groove. The support film has a first refractive index, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index, that is, light is incident perpendicularly. When it reaches the display panel, the process of penetrating the support film and entering the optical compensation film is a process from light dense to light dense. At the same time, a plurality of convex structures are formed on the side of the optical compensation film that is in contact with the supporting film. The width of each convex structure is smaller than or close to the wavelength of the incident light. The rising 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 each of the elongated convex structures is 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, the polarizing film has a transmission axis, the optical compensation film is a single optical axis liquid crystal film, an optical axis of the single optical axis liquid crystal film is perpendicular to the transmission axis, and the second The refractive index is the normal refractive index of the single optical axis liquid crystal film.

In one embodiment, the single-optical axis liquid crystal film is a single-optical axis A-compensation film, and the single-optical axis A-compensation film is filled with nematic liquid crystal, and the optical axes of the nematic liquid crystal are parallel On the light incident surface and perpendicular to the transmission axis, the second refractive index is a normal refractive index of the A-compensation film.

In one embodiment, the single-optical axis liquid crystal film is a single-optical axis C-compensation film, and the single-optical axis C-compensation film is filled with a dish-shaped liquid crystal, and an optical axis of the dish-shaped liquid crystal is perpendicular to the substrate. The light incident surface is perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the C-compensation film.

In one of the examples, the support film comprises a cellulose triacetate support film.

In one embodiment, the support film includes a polyethylene terephthalate support film.

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

In one embodiment, the polarizing film includes a polyvinyl alcohol film.

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

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

In one embodiment, a difference between the first refractive index and the second refractive index is greater than 0.01 and less than 1.5.

In one embodiment, the center-to-center distance between adjacent raised structures is less than or equal to the opening width of a single pixel.

In one embodiment, each of the raised structures is arranged periodically.

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

A polarizing structure includes:

An optical compensation film is formed with a plurality of convex structures that match the shape and size of the grooves. 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 The wavelength of the incident light is close to the center distance between adjacent convex structures is smaller than or equal to the opening width of a single pixel. The optical compensation film is adhered to the light exit surface of the support film, and Convex structures are received in the corresponding grooves, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index;

A polarizing film provided on the optical compensation film; and

A phase compensation film is provided on the polarizing film.

In the above-mentioned polarizing structure, each pixel opening corresponds to at least one convex structure to deflect the pixel light, which can deflect most of the light incident perpendicularly to the display panel to various side viewing angles in a two-dimensional plane, and distribute the energy of the positive viewing angle to Side view, thereby improving the quality of the side view.

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

A display device includes:

Backlight module, set to provide light source;

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:

An optical compensation film is formed with a plurality of convex structures matching 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 optical compensation film is attached to the support. The light emitting surface of the film, and each of the convex structures is received in the corresponding groove, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index;

A polarizing film provided on the optical compensation film; and

A phase compensation film is provided on the polarizing film.

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.

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

In one embodiment, an included angle between a divergence direction of the incident light generated by the backlight module and a direction perpendicular to the display panel is less than 30 °.

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

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 three-dimensional structural view of an optical compensation film in an embodiment;

3b is a schematic perspective view of an optical compensation film in another embodiment;

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

FIG. 4b is a diagram showing the direction relationship between the penetration of the polarizing film and the optical axis of the optical compensation film in FIG. 4a;

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

FIG. 5b is a diagram showing the direction relationship between the penetration of the polarizing film and the optical axis of the optical compensation film in FIG. 5a;

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

FIG. 7 is a schematic structural diagram of a display panel according to 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 only for the purpose of describing specific embodiments, 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 support film 100, an optical compensation film 200, a polarizing film 300, and a phase compensation film 400 stacked in this order. The support film 100 has a light incident surface 100A and a light emitting surface. 100B, the light incident surface 100A is the side that receives incident light, and the light enters the support film from the light incident surface 100A and exits from the light emitting surface 100B. In this solution, the light emitting surface 100B of the supporting film 100 is formed with a plurality of grooves 101, and the light emitting surface 100B of the supporting film is covered with an optical compensation film 200. The optical compensation film 200 is formed with a plurality of shapes corresponding to the grooves 101. The protruding structures 201 are matched with the size, and each protruding structure 201 can be just embedded in the corresponding groove 101. The width of each convex structure 201 is smaller than or close to the wavelength of the incident light. The optical compensation film 200 is attached to the light exit surface 100B of the support film 100, and each convex structure 201 is completely contained in the corresponding groove 101, that is, the support film. The 100 and the optical compensation film 200 are closely adhered without gaps. The supporting film 100 has a first refractive index n1, and the optical compensation film 200 has a second refractive index n2. The first refractive index n1 is larger than the second refractive index n2. When light penetrates the supporting film 100 and enters the optical compensation film 200, the light is emitted from the light. The process of dense into photophosgene.

Since the width of each raised structure 201 is smaller than or close to the wavelength of incident light, when the incident light propagates to each raised structure 201, since the width of each raised structure 201 is less than or close to the wavelength, the raised structure 201 is equivalent to one Grating. Light can be diffracted at the raised structure 201. The polarizing film 300 is superposed on the optical compensation film 200. After the light penetrates the optical compensation film 200 and enters the polarizing film 300, the polarizing film 300 polarizes the incident light. Only the light with the direction of the electric field parallel to the transmission axis of the polarizing film 300 can be used. The polarizing film 300 penetrates, that is, the electric field direction of the light emitted from the polarizing film 300 is parallel to the transmission axis of the polarizing film 300. The phase compensation film 400 is stacked on the polarizing film 300, and the phase compensation film 400 can perform phase compensation on light. In the display device, the phase delay phenomenon occurs after the light is processed. The phase delay will seriously affect the image quality. A phase compensation film 400 is provided to perform phase compensation before the light exits the display panel, which can avoid the effect of phase delay on the image quality. In one embodiment, the phase compensation film 400 may be an A-film or a C-film or a combination of an A-film and a C-film.

In the display device, since most of the light is perpendicularly incident into the polarized structure, that is, most of the light is perpendicular to the light incident surface 100A, this solution is provided by setting a supporting film 100 and an optical compensation film 200 with different refractive indexes and optically compensating A convex structure 201 is formed on the side of the film 200 that is in contact with the support film 100. A grating is formed by the convex structure 201. When incident light is incident perpendicularly from the support film 100 to the optical compensation film 200, diffraction occurs at the convex structure 201 and changes. The propagation path of the vertically incident 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.

In one embodiment, the polarizing film 300 is a polyvinyl alcohol film. The polyvinyl alcohol film has high transparency, high elongation performance, and has a polarizing effect on light. In one embodiment, the support film 100 may include a triacetate cellulose (TAC) support film, may also include a polyethylene terephthalate (PET) support film, and may further include polymethyl methacrylate (PMMA ) Supporting film. Since the polarizing film 300 is extremely hydrophilic, a protective film needs to be provided on the surface of the polarizing film 300 to support and protect the physical characteristics of the polarizing film 300. In this solution, the supporting film 100 and the optical compensation film 200 In addition to the functions, they also form a protective film on the light-incident side of the polarizing film 300, but the supporting film 100 and the optical compensation film 200 need to have appropriate thicknesses to protect the polarizing film 300.

As shown in FIG. 2, the width of each protruding structure 201 is X, and the value of X can be 300 nm ≦ X ≦ 1000 nm. When light vertically penetrates the support film 100 and enters the optical compensation film 200, the protruding structure 201 is Diffraction occurs, that is, the light propagation path changes, and the light deviates from the original perpendicular incidence 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 201 are formed on the optical compensation film 200. Each of the convex structures 201 is an elongated convex structure. Each of the elongated convex structures 201 can be arranged side by side. The width of the lifting structure 201 is smaller than or close to the wavelength of the incident light. As shown in FIG. 3b, the protruding structures 201 may also be arranged in a two-dimensional matrix array, and the width (X direction) and length (Y direction) of each protruding structure 201 are both smaller than or close to the wavelength of incident light. In the display device, most of the light generated by the backlight module is concentrated and incident perpendicularly into the polarizing structure. If the surface of each layer of the polarizing structure is flat and perpendicular to the normal incident light, the normal incident light does not pass through the polarizing structure. It will change its propagation direction, that is, when the light is incident perpendicularly, it will still be emitted vertically, causing the light to be concentrated at the front viewing angle, which makes the display quality of the front viewing direction better, but the side viewing angle is poor due to the weak light. In this solution, since a plurality of convex structures 201 are provided, each convex structure 201 can diffract normal incident light, and the light deviates from the original normal incident direction and diverges to the side, so more light enters the side Side to improve the quality of the side view angle. When the protruding structures 201 are elongated protruding structures arranged side by side, diffraction occurs only in one dimension (X direction), so that light is scattered to both sides of each protruding structure 201; when each protruding structure 201 is When the two-dimensional rectangular array is arranged, since the length and width of each convex structure 201 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 of the convex structures 201 is a rectangular parallelepiped convex structure. In other embodiments, each of the convex structures 201 may be other forms of protrusions. The size of each of the convex structures 201 can make incident light Diffraction is sufficient. In one embodiment, each of the protruding structures 201 is arranged periodically, that is, the centers of adjacent protruding structures 201 are equally spaced. In an embodiment, the center-to-center distance between adjacent convex structures 201 is less than or equal to 10 μm, that is, less than or equal to the opening width of a single pixel, that is, each pixel opening corresponds to at least one convex structure 201 corresponding to the pixel light. Deflect.

The polarizing film 300 has an absorption axis and a transmission axis. Polarized light having an electric field direction parallel to the transmission axis can pass through the polarizing film 300, that is, the direction of the electric field of the linearly polarized light passing through the polarizing film 300 is parallel to the transmission axis. In this solution, the optical compensation film 200 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 optical compensation film 200 may be a single optical axis liquid crystal film. The single optical axis liquid crystal film is filled with liquid crystal molecules and the optical axes of the liquid crystal molecules are parallel, so that the liquid crystal film has a single optical axis characteristic. The axis direction is the optical axis direction of the internal liquid crystal molecules, and the optical axis of the single optical axis liquid crystal film is perpendicular to the transmission axis of the polarizing film 300. Because liquid crystal is a birefringent material, usually, when light enters the liquid crystal, it is refracted into two rays of normal light and abnormal light. Among them, the refractive index of normal light is the normal refractive index, the refractive index of abnormal light is the abnormal refractive index, and the direction of abnormal refraction. The direction of the optical electric field is parallel to the optical axis of the liquid crystal. The normal direction of refraction is the direction in which the optical electric field is perpendicular to the optical axis of the liquid crystal. The direction of abnormal refraction is perpendicular to the direction of normal refraction. Components (abnormal refraction) and components perpendicular to the optical axis (normal refraction). Since the polarizing film 300 is provided above the optical compensation film 200, only light having an electric field direction parallel to the polarization axis of the polarizing film 300 can pass through the polarizing film 300. In this embodiment, the optical axis of the optical compensation film 200 is perpendicular to the transmission axis, and the direction of the normal electric field of the optical compensation film 200 is parallel to the transmission axis. Therefore, only the normal light component of the optical compensation film 200 can pass through the polarizing film. 300, so the normal refractive index n2 _o of the optical compensation film 200 is selected as the second refractive index, which is smaller than the refractive index of the support film 100. Similarly, in other embodiments, the optical axis of the optical compensation film 200 may be parallel to the transmission axis of the polarizing film 300. The normal light in the optical compensation film 200 can pass through the polarizing film 300, and the abnormality of the optical compensation film 200 is selected. The refractive index is the second refractive index of the optical compensation film 200, and the abnormal refractive index is smaller than the refractive index of the support film 100.

In one embodiment, as shown in FIGS. 4 a and 4 b, the optical compensation film 200 may be a single optical axis A-compensation film, and the single optical axis A-compensation film may be filled with nematic liquid crystal 202 and nematic liquid crystal. 202 is a long rod-shaped liquid crystal. The optical axis 203 of the nematic liquid crystal 202 is parallel to the light incident surface 100A and perpendicular to the transmission axis 301 of the polarizing film 300. The anomalous refraction direction of the nematic liquid crystal 202 is the direction and direction of the optical electric field. The direction in which the optical axis 203 of the nematic liquid crystal 202 is parallel, that is, the direction of the optical field abnormally refracted by the nematic liquid crystal 202 is perpendicular to the transmission axis 301 of the polarizing film 300, and the corresponding abnormal refractive index is n1 _e ; The normal refraction direction is the direction in which the direction of the optical electric field is perpendicular to the optical axis 203 of the nematic liquid crystal 202, that is, the direction of the normal electric field of refraction of the nematic liquid crystal 202 is parallel to the transmission axis 301 of the polarizing film 300, and the corresponding normal refractive index Is n1 _o . Generally, when incident light enters the optical compensation film 200, the optical electric field is refracted into a component parallel to the optical axis (abnormal refraction) and a component perpendicular to the optical axis (normal refraction). In this embodiment, since the optical axis 203 of the nematic liquid crystal is perpendicular to the transmission axis 301 of the polarizing film 300, if the light incident surface 100A is parallel to the X and Y directions in FIG. 4b, the optical axis of the nematic liquid crystal 203 may be in the Y direction in FIG. 4b, and the transmission axis 301 of the polarizing film 300 is in the X direction in FIG. 4b. In other embodiments, the optical axis 203 of the nematic liquid crystal may be in the X direction in FIG. 4b. The transmission axis 301 of the film 300 is in the Y direction in FIG. 4b, and it is sufficient that the optical axis 203 is parallel to the light incident surface 100A and perpendicular to the transmission axis 301. In this embodiment, the incident light is refracted into normal light and abnormal light after entering the optical compensation film 200, wherein the electric field direction of the normal light is parallel to the X direction, that is, the electric field direction of the normal light is parallel to the transmission axis, and the electric field of the abnormal light The direction is parallel to the Y direction, and only normal light can pass through the polarizing film 300, so the second refractive index is the normal refractive index of the optical compensation film 200.

In an embodiment, as shown in FIG. 5a and FIG. 5b, the optical compensation film 200 is a single optical axis C-compensation film, and the single optical axis C-compensation film can be filled with the dish-shaped liquid crystal 204 and the optical axis of the dish-shaped liquid crystal 204 205 is perpendicular to the light incident surface 100A and perpendicular to the transmission axis 301 of the polarizing film 300. The abnormal refraction direction of the dish-shaped liquid crystal 204 is a direction in which the direction of the optical electric field is parallel to the optical axis 205 of the dish-shaped liquid crystal 204, that is, the dish-shaped liquid crystal 204 is abnormal. optical field transmission axis direction 300 of the polarizing film 301 perpendicular to the refraction, a refractive index corresponding to the abnormal n1 _e; normal direction refractive smectic liquid crystal 2044 is the direction of the optical axis direction of the optical electric field perpendicular to the smectic liquid crystal 204, i.e., The direction of the normal electric field of refraction of the dish-shaped liquid crystal 204 is parallel to the transmission axis 301 of the polarizing film 300, and the corresponding normal refractive index is n1 _o . When n1 _e <n1 _o , the single optical axis C-compensation film is a negative single Optical axis C-compensation film. When n1 _e > n1 _o , the single optical axis C-compensation film is a positive single optical axis C-compensation film. In this embodiment, since the optical axis 205 of the dish-shaped liquid crystal 204 is perpendicular to the transmission axis 301 of the polarizing film 300, for example, the optical axis 205 of the dish-shaped liquid crystal 204 may be in the Z direction in FIG. The axis 301 is in the Y direction in FIG. 5b. In other embodiments, the transmission axis 301 of the polarizing film 300 may be in any direction of the XY plane in FIG. 4b, so that the optical axis 205 is perpendicular to the transmission axis 301. In this embodiment, the direction of the optical electric field of the normal light of the optical compensation film 200 is parallel to the transmission axis, and the direction of the electric field of the abnormal light is perpendicular to the transmission axis. Only the normal light component in the optical compensation film 200 can penetrate the polarizing film 300. Therefore, the second refractive index is the normal refractive index of the optical compensation film 200, which is smaller than the refractive index of the support film 100. In one embodiment, the single optical axis C-compensation film is a negative single optical axis C-compensation film . In one embodiment, the polarizing structure further includes a pressure-sensitive adhesive layer stacked on the phase compensation film 400, and the polarizing structure can be pasted on the glass substrate through the pressure-sensitive adhesive layer.

This application also discloses another polarizing structure. As shown in FIG. 1 and FIG. 3b, the polarizing structure includes a support film 100, an optical compensation film 200, a polarizing film 300, and a phase compensation film 400 stacked in this order. Among them, the supporting film 100 has a light incident surface 100A and a light emitting surface 100B, a plurality of grooves 101 are formed on the light emitting surface 100B of the support film 100, and a plurality of protrusions matching the shape and size of the groove 101 are formed on the optical compensation film 200 The raised structures 201 are arranged in a two-dimensional matrix array. The width (X direction) and length (Y direction) of each raised structure 201 are less than or close to the wavelength of incident light. The center distance is less than or equal to the opening width of a single pixel. The optical compensation film 200 is attached to the light exit surface 100B of the support film 100, and each convex structure 201 is completely received in the corresponding groove 101. The support film 100 has a first refraction 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 film 100 and enters the optical compensation film 200, it is a process from the light dense to the light dense, so the light can be diffracted at each convex structure 201, so that the light is directed to each side in the two-dimensional plane. Angle of view deflection. Since the center-to-center distance between adjacent convex structures 201 is less than or equal to the opening width of a single pixel, each pixel opening can have at least one convex structure 201 corresponding to deflect light from the pixel.

The present application also discloses a display device. As shown in FIG. 6, the display device includes a backlight module 2 and a display panel 1 disposed on one side of the backlight module 2, wherein 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, which is incident on the display panel 1 in a concentrated manner, and a divergence direction of the incident light is at a small angle θ with a direction perpendicular to the display panel 1, and the small angle θ may be less than 30 °. Most of the light received by the display panel 1 is perpendicularly incident light. Since the support film 100 and the optical compensation film 200 exist in the display panel 1, and the convex structure 201 is formed on the side of the optical compensation film 200 that is in contact with the support film 100, Diffraction at each raised structure 201 can deflect the vertically incident light, thereby allocating 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 1 has been described above, and is not repeated here. Among them, 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 each provided with a long V-shaped groove, and the side of the V-shaped groove on the lower surface of the light guide plate 2B. The wall is parallel to the side-type light source 2A, and the side wall of the V-shaped groove on the upper surface of the light guide plate 2B is perpendicular to the side-type light source 2A, that is, the length direction of the V-shaped groove on the upper surface of the light guide plate 2B The length directions are perpendicular to each other.

In an embodiment, as shown in FIG. 7, the display panel may be a liquid crystal display panel. The liquid crystal display panel includes an upper polarizing plate 10, a lower polarizing plate 30, and a liquid crystal layer sandwiched between the upper and lower polarizing plates. 20. The liquid crystal layer 20 includes a substrate and liquid crystal molecules sandwiched between the substrates. The upper polarizing plate includes the polarizing structure, or the lower polarizing plate includes the polarizing structure, or both the upper polarizing plate and the lower polarizing plate include the polarizing structure. The incident light becomes linearly polarized light after passing through the lower polarizing plate, and the liquid crystal layer 20 can reverse the polarization direction of the linearly polarized light, so that the linearly polarized light can pass through the upper polarizing plate, thereby displaying a picture on the display panel. 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 polarizing structure is included. 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 supporting film having a first refractive index, the supporting film having a light incident surface and a light emitting surface opposite to the light incident surface, and a plurality of grooves are formed on the light emitting surface;

An optical compensation film is formed with a plurality of convex structures matching 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 optical compensation film is attached to the support. The light-emitting surface of the film, and each of the convex structures is received in the corresponding groove, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index;

A polarizing film provided on the optical compensation film; and

A phase compensation film is provided on the polarizing film.
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 each of the elongated convex structures is 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 1, wherein the polarizing film has a transmission axis, the optical compensation film is a single optical axis liquid crystal film, and an optical axis of the single optical axis liquid crystal film is perpendicular to the transmission axis The second refractive index is a normal refractive index of the single optical axis liquid crystal film.
The polarizing structure according to claim 5, wherein the single optical axis liquid crystal film is a single optical axis A-compensation film, and the single optical axis A-compensation film is filled with a nematic liquid crystal, and the nematic phase An optical axis of the liquid crystal is parallel to the light incident surface and perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the A-compensation film.
The polarizing structure according to claim 5, wherein the single-optical axis liquid crystal film is a single-optical axis C-compensating film, and the single-optical axis C-compensating film is filled with a dish-shaped liquid crystal, An optical axis is perpendicular to the light incident surface and perpendicular to the transmission axis, and the second refractive index is a normal refractive index of the C-compensation film.
The polarizing structure according to claim 1, wherein the supporting film comprises a triacetate supporting film.
The polarizing structure according to claim 1, wherein the supporting film comprises a polyethylene terephthalate supporting film.
The polarizing structure according to claim 1, wherein the support film comprises a polymethyl methacrylate support film.
The polarizing structure according to claim 1, wherein the polarizing film comprises a polyvinyl alcohol film.
The polarizing structure according to claim 1, wherein the first refractive index is greater than 1.0 and less than 2.5.
The polarizing structure according to claim 1, wherein the second refractive index is greater than 1.0 and less than 2.5.
The polarizing structure according to claim 1, wherein a difference between the first refractive index and the second refractive index is greater than 0.01 and less than 1.5.
The polarizing structure of claim 1, wherein a center-to-center distance between adjacent convex structures is less than or equal to an opening width of a single pixel.
The polarizing structure according to claim 1, wherein each of the convex structures is arranged periodically.
A polarizing structure includes:

A supporting film having a first refractive index, the supporting film having a light incident surface and a light emitting surface opposite to the light incident surface, and a plurality of grooves are formed on the light emitting surface;

An optical compensation film is formed with a plurality of convex structures that match the shape and size of the grooves. 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 The wavelength of the incident light is close to the center distance between adjacent convex structures is smaller than or equal to the opening width of a single pixel. The optical compensation film is adhered to the light exit surface of the support film, and Convex structures are received in the corresponding grooves, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index;

A polarizing film provided on the optical compensation film; and

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

Backlight module, set to provide light source;

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 supporting film having a first refractive index, the supporting film having a light incident surface and a light emitting surface opposite to the light incident surface, and a plurality of grooves are formed on the light emitting surface;

An optical compensation film is formed with a plurality of convex structures matching 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 optical compensation film is attached to the support. The light emitting surface of the film, and each of the convex structures is received in the corresponding groove, the optical compensation film has a second refractive index, and the first refractive index is greater than the second refractive index;

A polarizing film provided on the optical compensation film; and

A phase compensation film is provided on the polarizing film.
The display device according to claim 18, wherein the display panel is a liquid crystal display panel.
The display device according to claim 18, wherein an included angle between a divergence direction of the incident light generated by the backlight module and a direction perpendicular to the display panel is less than 30 °.