WO2020155281A1

WO2020155281A1 - Optical film layer and display device

Info

Publication number: WO2020155281A1
Application number: PCT/CN2019/076560
Authority: WO
Inventors: 单剑锋
Original assignee: 惠科股份有限公司
Priority date: 2019-01-30
Filing date: 2019-02-28
Publication date: 2020-08-06
Also published as: CN109597239A

Abstract

Disclosed are an optical film layer (250) and a display device (10). The optical film layer (250) comprises an anisotropic optical layer with a single optical axis (251) and an isotropic optical layer (252), wherein multiple grooves are formed on one side of the anisotropic optical layer with a single optical axis (251); the isotropic optical layer (252) comprises a plate-shaped portion (2521), and multiple raised structures (2522) which are attached to one side of the plate-shaped portion (2521) and match the grooves in terms of shape and size; and the refraction index (ns2) of the isotropic optical layer (252) is greater than an extraordinary light refraction index (ne1) of the anisotropic optical layer (251) with a single optical axis.

Description

Optical film and display device

This application claims to be submitted to the Chinese Patent Office on 2019-01-30, the application number is 2019100908090, and the application title is "Optical Film and Display Device". The entire content of the Chinese patent application is incorporated into this application by reference.

Technical field

This application relates to an optical film layer and a display device.

Background technique

The statements here only provide background information related to this application, and do not necessarily constitute prior art.

Current large-size liquid crystal display panels usually use VA (Vertical Alignment) liquid crystal panels or IPS (In-Plane Switching) liquid crystal panels. Compared with IPS liquid crystal panels, VA-type liquid crystal panels have higher production efficiency and lower production efficiency. The manufacturing cost is advantageous, but in terms of optical properties, compared with IPS liquid crystal panels, there are more obvious defects in optical properties. In particular, large-size panels require a larger viewing angle for commercial applications. For example, the VA-type liquid crystal panel drives the brightness of the large viewing angle to quickly saturate with the voltage, which causes the viewing angle image quality contrast and color shift compared to the front view image quality to deteriorate more seriously, resulting in visual role shift.

Therefore, the exemplary VA-type liquid crystal panel has the problem of large viewing angle image quality contrast and color shift compared to the front view image quality, resulting in a problem of viewing role shift.

Summary of the invention

According to various embodiments disclosed in the present application, an optical film layer and a display device are provided.

An optical film layer, comprising:

A single optical axis anisotropic optical layer, a plurality of grooves are formed on one side of the single optical axis anisotropic optical layer;

The isotropic optical layer includes a plate-shaped part and a plurality of convex structures that are attached to one side of the plate-shaped part and matched with the shape and size of the groove. The refractive index of the isotropic optical layer It is greater than the extraordinary refractive index of the single optical axis anisotropic optical layer.

In one of the embodiments, the extraordinary refractive index of the single optical axis anisotropic optical layer is 1.0-2.5.

In one of the embodiments, the refractive index of the isotropic optical layer is 1.0-2.5.

In one of the embodiments, the difference between the refractive index of the isotropic optical layer and the extraordinary refractive index of the single optical axis anisotropic optical layer is 0.01-2.

In one of the embodiments, the protruding structure is a triangular prism structure, and one side of the triangular prism structure is attached to the plate-shaped portion to extend, the extension directions of a plurality of the protruding structures are parallel, and two adjacent ones The raised structures are arranged at intervals.

In one of the embodiments, the convex structure is a triangular pyramid structure, a plurality of the convex structures are arranged in a two-dimensional matrix array, and two adjacent convex structures are arranged at intervals.

In one of the embodiments, the material of the single optical axis anisotropic optical layer includes nematic liquid crystal molecules.

An optical film layer, comprising:

The isotropic optical layer includes a plate-shaped part and a plurality of convex structures that are attached to one side of the plate-shaped part and matched with the shape and size of the groove. The refractive index of the isotropic optical layer Greater than the extraordinary refractive index of the single optical axis anisotropic optical layer;

Wherein, the extraordinary refractive index of the single optical axis anisotropic optical layer is 1.0-2.5, and the refractive index of the isotropic optical layer is 1.0-2.5;

The difference between the refractive index of the isotropic optical layer and the extraordinary refractive index of the single optical axis anisotropic optical layer is 0.01-2.

A display device includes:

Backlight module, used to provide incident light;

A display panel, placed above the backlight module, for receiving the incident light and displaying images;

Wherein, the display panel includes:

A first substrate and a second substrate disposed oppositely;

A first grating layer disposed on the first substrate on the side away from the second substrate;

A display layer provided between the first substrate and the second substrate;

A second grating layer arranged between the display layer and the second substrate;

The optical film layer as described above that is disposed between the second grating layer and the second substrate, and the single optical axis anisotropic optical layer is disposed on the side of the second grating layer;

A photoresist layer provided between the optical film layer and the second substrate, or a photoresist layer provided between the first substrate and the display layer.

In one of the embodiments, the first grating layer includes a plurality of strip-shaped metal layers formed on the first substrate, and the plurality of metal layers are spaced apart and arranged in parallel.

In one of the embodiments, the second grating layer includes a transparent substrate and a plurality of strip-shaped metal layers formed on the transparent substrate, and the plurality of metal layers are spaced apart and arranged in parallel.

In one of the embodiments, the width of the metal layer of the first grating layer is 50nm-150nm, the thickness of the metal layer is 100nm-200nm, and the distance between two adjacent metal layers is 100nm-200nm.

In one of the embodiments, the width of the metal layer of the second grating layer is 50nm-150nm, the thickness of the metal layer is 100nm-200nm, and the distance between two adjacent metal layers is 100nm-200nm.

In one of the embodiments, the photoresist layer is disposed between the optical film layer and the second substrate, and the display panel further includes:

A compensation film layer arranged between the display layer and the second grating layer; and

A compensation film layer arranged between the display layer and the first substrate.

A compensation film layer arranged between the display layer and the second grating layer.

In one of the embodiments, the photoresist layer is disposed between the first substrate and the display layer; the display panel further includes:

A compensation film layer arranged between the photoresist layer and the first substrate.

The details of one or more embodiments of the application are set forth in the following drawings and description. Other features and advantages of this application will become apparent from the description, drawings and claims.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. A person of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of the structure of an optical film layer according to an embodiment;

Fig. 2 is a schematic diagram of the refraction effect on the interface that is not perpendicular to the light advancing direction;

3 is a schematic diagram of a three-dimensional structure of an isotropic optical layer according to an embodiment;

4 is a schematic diagram of the cross-sectional structure of the isotropic optical layer corresponding to FIG. 3;

5 is a schematic diagram of a three-dimensional structure of an isotropic optical layer according to another embodiment;

6 is a schematic diagram of the cross-sectional structure of the isotropic optical layer corresponding to FIG. 5;

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

8 is a schematic structural diagram of the backlight module of the display device shown in FIG. 7;

FIG. 9 is a schematic structural diagram of a display panel of an embodiment of the display device shown in FIG. 7;

10 is a schematic structural diagram of a display panel of an embodiment of the display device shown in FIG. 7;

FIG. 11 is a schematic diagram of the structure of a first grating layer according to an embodiment;

FIG. 12 is a schematic structural diagram of a display panel corresponding to another embodiment of FIG. 9;

FIG. 13 is a schematic structural diagram of a display panel corresponding to another embodiment of FIG. 9;

FIG. 14 is a schematic structural diagram of a display panel corresponding to another embodiment of FIG. 9;

FIG. 15 is a schematic structural diagram of a display panel corresponding to another embodiment of FIG. 10;

FIG. 16 is a schematic structural diagram of a display panel corresponding to another embodiment of FIG. 10;

FIG. 17 is a schematic structural diagram of a display panel corresponding to another embodiment of FIG. 10.

detailed description

In order to make the technical solutions and advantages of the present application clearer, the following further describes the present application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and not to limit the application.

Refer to FIG. 1, which is a schematic diagram of the structure of the optical film layer in this embodiment.

In this embodiment, the optical film layer 250 includes a single optical axis anisotropic optical layer 251 and an isotropic optical layer 252.

Among them, the single optical axis anisotropic optical layer 251 has optical anisotropy and has an extraordinary refractive index ne ₁ and an ordinary refractive index no _1. In one embodiment, the single optical axis anisotropic optical layer 251 is a positive type. Single optical axis optical layer, ne ₁ >no ₁ . The extraordinary refractive index ne ₁ is the equivalent refractive index of the single optical axis anisotropic optical layer 251 when the light polarization direction is parallel to the optical axis; the ordinary refractive index no ₁ is the single optical axis anisotropic optical layer 251 when the light is polarized The equivalent refractive index whose direction is perpendicular to the optical axis will cause birefringence when light passes through the single optical axis anisotropic optical layer 251. Specifically, an xyz coordinate system is established, nx is the refractive index of the single optical axis anisotropic optical layer 251 in the x direction, ny is the refractive index of the single optical axis anisotropic optical layer 251 in the y direction, and nz is the refractive index of the single optical axis. The refractive index of the anisotropic optical layer 251 in the z direction, which is the direction in which the film thickness of the single optical axis anisotropic optical layer 251 extends (perpendicular to the light-emitting surface of the isotropic optical layer 252), ne ₁ =nx>no ₁ =ny or ne ₁ =ny>no ₁ =nx, no ₁ =nz. In one embodiment, the extraordinary refractive index ne ₁ of the single optical axis anisotropic optical layer 251 is 1.0-2.5. In an embodiment, the material of the single optical axis anisotropic optical layer 251 includes but is not limited to nematic liquid crystal molecular materials.

Among them, the isotropic optical layer 252 has optical isotropy, and the refractive index in each direction is the same. In one embodiment, the refractive index ns ₂ of the isotropic optical layer 252 is 1.0-2.5. In one embodiment, the material of the isotropic optical layer 252 is an isotropic refractive index material, which may be an organic transparent material or an inorganic transparent material coated with a planarization structure on the photoresist.

Specifically, the refractive index ns _{2 of the} isotropic optical layer 252 is greater than the extraordinary refractive index ne _{1 of the} single optical axis anisotropic optical layer 251. Specifically, the difference between the refractive index ns _{2 of the} isotropic optical layer 252 and the extraordinary refractive index ne ₁ of the single optical axis anisotropic optical layer 251 is 0.01-2. When the difference between ns ₂ and ne ₁ is larger, it is easier to distribute the front-view light energy to a large viewing angle. In one embodiment, the ordinary refractive index no ₁ of the single optical axis anisotropic optical layer 251 is the refractive index in the 0/180 degree direction, and the extraordinary refractive index ne ₁ of the single optical axis anisotropic optical layer 251 is 90. /270 degree direction of refractive index. In one embodiment, the ordinary refractive index no ₁ of the single optical axis anisotropic optical layer 251 is the refractive index in the 90/270 degree direction, and the extraordinary refractive index ne ₁ of the single optical axis anisotropic optical layer 251 is 0. /180 degree direction of refractive index. Wherein, the surface formed by the 0/180 degree direction and the 90/270 degree direction is parallel to the light-emitting surface of the isotropic optical layer 252.

In this embodiment, a plurality of grooves are formed on one side of the single optical axis anisotropic optical layer 251, and the isotropic optical layer 252 includes a plate-shaped portion 2521 and a plurality of grooves attached to the plate-shaped portion 2521 side. A convex structure 2522 matching the shape and size of the groove. Since the refractive index ns _{2 of the} isotropic optical layer 252 is greater than the extraordinary refractive index ne _{1 of the} single optical axis anisotropic optical layer 251, the light incident surface of the convex structure 2522 forms a junction surface that is not perpendicular to the light advancing direction. The interface that is not perpendicular to the direction of light travel produces a refraction effect (see Figure 2), which makes the light travel to produce angular changes. Specifically, the convex structures are arranged periodically, that is, the refraction portions constructed by the convex structures are arranged periodically.

In one embodiment, referring to FIG. 3, the protruding structure 2522 is a triangular prism structure, the triangular prism structure has multiple sides, and one side of the triangular prism structure is extended by the plate-shaped portion 2521, and the extending direction of the multiple protruding structures 2522 In parallel, two adjacent raised structures 2522 are arranged at intervals. Specifically, please refer to FIG. 4 together, the width of the side surface of the plate-shaped portion 2521 is Lx ₁ , and the distance between the centers of the two adjacent protrusion structures 2522 of the side surface of the plate-shaped portion 2521 is Px ₁ , Px ₁ ≥ Lx ₁ , when Px ₁ =Lx ₁ , two adjacent convex structures are arranged in close contact. The thickness of the convex structure 2522 is d ₁ , and the thickness of the isotropic optical layer 252 is D ₁ , d _{1 is} not 0, and D ₁ ≥ d ₁ .

In one embodiment, referring to FIG. 5, the protruding structure 2522 is a triangular pyramid structure, the plurality of protruding structures 2522 are arranged in a two-dimensional matrix array, and two adjacent protruding structures 2522 are arranged at intervals to more effectively integrate The front-view light energy is distributed to the two-dimensional direction, making the full-view viewing more uniform. Specifically, please refer to FIG. 6 together. In the x direction, the width of the side surface of the plate-shaped portion 2521 is Lx ₂ , and the distance between the centers of the two adjacent protrusion structures 2522 of the side surface of the plate-shaped portion 2521 Px ₂ , Px ₂ ≥Lx ₂ , when Px ₂ =Lx ₂ , two adjacent convex structures are arranged in the x direction. In the y direction, the width of the side surface of the plate-shaped portion 2521 is Ly ₂ , the distance between the centers of the two adjacent protrusion structures 2522 and the side surface of the plate-shaped portion 2521 is Py ₂ , Py ₂ ≥ Ly ₂ , When Py ₂ =Ly ₂ , two adjacent raised structures are arranged in close contact with each other in the y direction. The thickness of the convex structure 2522 is d ₂ , the thickness of the isotropic optical layer 252 is D ₂ , d _{2 is} not 0, and D ₂ ≥d ₂ .

The optical film layer provided by this embodiment includes a single optical axis anisotropic optical layer 251 and an isotropic optical layer 252. When light passes through the single optical axis anisotropic optical layer 251, the extraordinary refractive index of the light is ne ₁ , and the light The refractive index of the isotropic optical layer 252 is ns ₂ , and since ns ₂ >ne ₁ , the interface between the uniaxial anisotropic optical layer 251 and the isotropic optical layer 252 sees that light is emitted from the optically thinner medium. Refraction is generated to the optically dense medium, whereby the optical film layer distributes the normal viewing angle light type energy to the optical phenomenon of a large viewing angle, and improves the viewing angle deviation.

Refer to FIG. 7, which is a schematic structural diagram of the display device in this embodiment.

In this embodiment, the display device 10 includes a backlight module 100 and a display panel 200. Among them, the backlight module 100 provides a collimated light emitting backlight source (collimate light emitting BL), so that the energy of the light is concentrated in the positive viewing angle for output.

In this embodiment, referring to FIG. 8, the backlight module 100 has a highly directional backlight light output, including a reflective sheet 110, a light guide plate 120, a prism film 130, and an LED light source 140, the reflective sheet 110 and the light guide plate 120, and a prism The films 130 are stacked in sequence, the light guide plate 120 has a light incident surface 121, the LED light source 140 is arranged opposite to the light incident surface 121, and the light guide plate 120 is provided with a strip-shaped first groove 122 on the side close to the reflective sheet 110. The cross section of 122 is V-shaped, the extending direction of the first groove 122 is perpendicular to the light emitting direction of the LED light source 140, the light guide plate 120 is provided with a strip-shaped second groove 123 on the side close to the prism film 130, and the second groove 123 The cross section of the second groove 123 is V-shaped, and the extending direction of the second groove 123 is parallel to the light emitting direction of the LED light source 140. Optionally, the prism side of the prism film 130 is laminated on the light guide plate 120.

In this embodiment, referring to FIG. 9 and FIG. 10, FIG. 9 and FIG. 10 are schematic diagrams of the structure of the display panel in this embodiment.

In this embodiment, the display panel 200 includes a first grating layer 210, a first substrate 220, a display layer 230, a second grating layer 240, an optical film layer 250, a photoresist layer 260, and a second substrate 270.

Specifically, the first substrate 220 and the second substrate 270 are disposed oppositely; the first grating layer 210 is disposed on the first substrate 220 on the side away from the second substrate 270; the display layer 230 is disposed between the first substrate 220 and the second substrate 270 The second grating layer 240 is provided between the display layer 230 and the second substrate 270; the optical film layer 250 is provided between the second grating layer 240 and the second substrate 270, wherein the single optical axis anisotropic optical layer is provided On the second grating layer 240 side; the photoresist layer 260 is disposed between the optical film layer 250 and the second substrate 270, or between the first substrate 220 and the display layer 230.

That is, in one embodiment, referring to FIG. 9, the display panel 200 includes a first grating layer 210, a first substrate 220, a display layer 230, a second grating layer 240, an optical film layer 250, and a photoresist layer which are sequentially stacked. 260 and a second substrate 270; in another embodiment, referring to FIG. 10, the display panel 200 includes a first grating layer 210, a first substrate 220, a photoresist layer 260, a display layer 230, and a second grating layered in sequence. The layer 240, the optical film layer 250 and the second substrate 270.

In this embodiment, the first grating layer 210 is disposed on the first substrate 220 away from the second substrate 270, and the first grating layer 210 can convert natural light into polarized light. The thickness of the first grating layer 210 is generally less than 20 μm.

Specifically, referring to FIG. 11, the first grating layer 210 includes a transparent substrate 2101 and a plurality of strip-shaped metal layers 2102 formed on the transparent substrate 2101, and the plurality of metal layers 2102 are arranged in parallel and spaced apart. The transparent substrate 2101 includes but is not limited to one of a glass substrate, a silica gel substrate, a silicon dioxide substrate, a silicon nitride substrate, a polymethyl methacrylate substrate, and a polyethylene terephthalate substrate. The metal layer 2102 includes but is not limited to gold, aluminum, and copper. The metal layer 2102 is formed on the transparent substrate 2101, a plurality of metal layers 2102 are spaced and evenly arranged along a straight line, and the extending directions of the plurality of metal layers 2102 are parallel to each other to form a grating. Optionally, the width of the metal layer 2102 is 50nm-150nm; the thickness of the metal layer 2102 is 100nm-200nm; the distance between two adjacent metal layers 2102 is 100nm-200nm.

In this embodiment, the first grating layer 210 is divided into electromagnetic waves whose vibration direction is perpendicular to the extension direction of the metal layer and electromagnetic waves whose vibration direction is parallel to the extension direction of the metal layer. The first grating layer 210 absorbs or reflects electromagnetic wave vibration components and The electromagnetic wave component parallel to the extension direction of the metal layer only penetrates the electromagnetic wave component perpendicular to the extension direction of the metal layer, and obtains the same effect as the polarizer, passing only the polarized light perpendicular to the extension direction of the polarizer.

Specifically, the light is composed of horizontal polarization (direction of electric field vibration 0/180 degree) and vertical polarization (direction of electric field vibration 90/270 degree), and the first grating layer 210 has the function of absorbing and transmitting polarized light. When the arrangement direction of the metal layers of the first grating layer 210 is parallel to the 0/180 degree direction, the extension direction of the metal layers of the first grating layer 210 is parallel to the 90/270 degree direction, and it is expected that horizontally polarized light can pass through the first grating Layer 210; when the arrangement direction of the metal layer of the first grating layer 210 is parallel to the 90/270 degree direction, the extension direction of the metal layer of the first grating layer 210 is parallel to the 0/180 degree direction, and it is expected that vertically polarized light can pass The first grating layer 210. Therefore, the first grating layer 210 can replace the lower polarizer in the traditional structure, so that the thickness of the display panel 200 is thinner.

In this embodiment, the first substrate 220 and the second substrate 270 are disposed opposite to each other. The materials of the first substrate 220 and the second substrate 270 are not limited, and specifically, a glass substrate can be selected. The display layer 230 includes a liquid crystal material layer and electrode layers disposed on the upper and lower surfaces of the liquid crystal material layer, wherein the material of the electrode layer may be indium tin oxide.

In this embodiment, the second grating layer 240 includes a transparent substrate and a plurality of strip-shaped metal layers formed on the transparent substrate, and the plurality of metal layers are spaced apart and arranged in parallel. The transparent substrate includes but is not limited to one of a glass substrate, a silica gel substrate, a silicon dioxide substrate, a silicon nitride substrate, a polymethyl methacrylate substrate, and a polyethylene terephthalate substrate. The metal layer includes but is not limited to gold, aluminum and copper. The metal layer is formed on the transparent substrate, and the multiple metal layers are spaced and evenly arranged along a straight line, and the extension directions of the multiple metal layers are parallel to each other to form a grating. Optionally, the width of the metal layer is 50 nm-150 nm; the thickness of the metal layer is 100 nm-200 nm; and the distance between two adjacent metal layers is 100 nm-200 nm. Optionally, the second grating layer 240 is arranged opposite to the first grating layer 210 of the optical film layer 250, that is, the multiple metal layers of the second grating layer 240 correspond to the multiple metal layers of the first grating layer 210.

The second grating layer 240 is arranged corresponding to the first grating layer 210 and has similar structure and function. It has the functions of absorbing and penetrating polarized light, and can replace the upper polarizer in the traditional structure, making the display panel 200 thinner.

When the arrangement direction of the metal layers of the second grating layer 240 is parallel to the 0/180 degree direction, and the extending direction of the metal layers of the second grating layer 240 is parallel to the 90/270 degree direction, it is expected that horizontally polarized light can pass through the second grating layer 240 The extraordinary refractive index of the horizontally polarized light passing through the uniaxial anisotropic optical layer 251 is ne ₁ , and the refractive index of the horizontally polarized light passing through the isotropic optical layer 252 is ns ₂ , since ns ₂ >ne ₁ , The interface between the optical axis anisotropic optical layer 251 and the isotropic optical layer 252 sees that horizontally polarized light is reflected from the optically thin medium to the optically dense medium to produce refraction, so that the normal viewing angle light type energy distribution is large. Optical phenomenon.

When the arrangement direction of the metal layers of the second grating layer 240 is parallel to the 90/270 degree direction, when the extension direction of the metal layers of the second grating layer 240 is parallel to the 0/180 degree direction. It is expected that vertically polarized light can pass through the second grating layer 240. The extraordinary refractive index of the vertically polarized light passing through the single-axis anisotropic optical layer 251 is ne ₁ , and the refractive index of the vertically polarized light passing through the isotropic optical layer 252 Is ns ₂ , because ns ₂ >ne ₁ , the interface between the single-axis anisotropic optical layer 251 and the isotropic optical layer 252 sees that the vertically polarized light is refracted by the optically thinner medium and the optically denser medium. It is an optical phenomenon that enables the front-view light type energy to be distributed with a large viewing angle.

In this embodiment, the optical film layer 250 refers to the related description of the previous embodiment, and will not be repeated here. The optical film layer 250 can distribute the positive viewing angle light type energy to a large viewing angle, and improve the viewing angle deviation.

In this embodiment, the photoresist layer 260 is used to provide hue to the display panel, so that the display panel forms a colorful display image. The photoresist layer 260 may be disposed between the second grating layer 240 and the second substrate 270, or may also be disposed between the first substrate 220 and the display layer 230.

Please refer to FIGS. 12-14 (the grid layer in the figure is a compensation film layer). In one embodiment, when the photoresist layer 260 is disposed between the second grating layer 240 and the second substrate 270, the display panel It may further include: a compensation film layer disposed between the display layer 230 and the second grating layer 240; and/or a compensation film layer disposed between the display layer 230 and the first substrate 220.

Please also refer to FIGS. 15-17 (the grid layer in the figure is a compensation film layer). In one embodiment, when the photoresist layer 260 is disposed between the first substrate 220 and the display layer 230, the display panel can also It includes: a compensation film layer disposed between the display layer 230 and the second grating layer 240; and/or a compensation film layer disposed between the photoresist layer 260 and the first substrate 220.

It should be noted that the display panel 200 is not limited to the above-mentioned laminated structure, and different layers can be added with materials with special functions according to different requirements. For example, other functional materials are added to a single-function film layer to obtain a multi-functional film layer. In addition, the stacking order of the various film layers in the display panel 200 can be changed according to the required functions, and at the same time, other functional film layers and the like can be added as required.

The display device 10 provided by this embodiment includes a backlight module 100 with a high directivity backlight output, and a thin display panel 200 with a large viewing angle and improved color shift. Among them, the display panel 200 can distribute the light-type energy of the front viewing angle to a large viewing angle through the arrangement of the optical film layer 250 on the one hand, and solve the problem of the large viewing angle of the display panel 200 without dividing each sub-pixel into a main pixel. And the sub-pixel structure, avoiding the need to redesign metal traces or thin film transistor components to drive the sub-pixels and the sacrifice of light-transmitting openings, thereby having a high panel transmittance, increasing the light energy, and achieving energy-saving benefits while maintaining The display resolution and driving frequency of the display panel 200; on the other hand, both the first grating layer 210 and the second grating layer 240 can turn natural light into polarized light, instead of a thicker polarizing plate, so that the display panel 200 The thickness is relatively thin, so that the display device 10 has a light and thin volume, a low display color shift rate and a high display efficiency, which can improve the user experience.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

An optical film layer, comprising:

A single optical axis anisotropic optical layer, a plurality of grooves are formed on one side of the single optical axis anisotropic optical layer;

The isotropic optical layer includes a plate-shaped part and a plurality of convex structures that are attached to one side of the plate-shaped part and matched with the shape and size of the groove. The refractive index of the isotropic optical layer It is greater than the extraordinary refractive index of the single optical axis anisotropic optical layer.
The optical film layer according to claim 1, wherein the extraordinary refractive index of the single optical axis anisotropic optical layer is 1.0-2.5.
The optical film layer of claim 1, wherein the refractive index of the isotropic optical layer is 1.0-2.5.
The optical film layer according to claim 1, wherein the difference between the refractive index of the isotropic optical layer and the extraordinary refractive index of the single optical axis anisotropic optical layer is 0.01-2.
The optical film layer according to claim 1, wherein the convex structure is a triangular prism structure, and one side of the triangular prism structure is attached to the plate-shaped portion to extend, and the extension directions of a plurality of the convex structures are parallel , Two adjacent raised structures are arranged at intervals.
The optical film layer according to claim 1, wherein the convex structure is a triangular pyramid structure, a plurality of the convex structures are arranged in a two-dimensional matrix array, and two adjacent convex structures are arranged at intervals.
4. The optical film layer according to claim 1, wherein the material of the single optical axis anisotropic optical layer comprises a nematic liquid crystal molecular material.
An optical film layer, comprising:

A single optical axis anisotropic optical layer, a plurality of grooves are formed on one side of the single optical axis anisotropic optical layer;

The isotropic optical layer includes a plate-shaped part and a plurality of convex structures that are attached to one side of the plate-shaped part and matched with the shape and size of the groove. The refractive index of the isotropic optical layer Greater than the extraordinary refractive index of the single optical axis anisotropic optical layer;

Wherein, the extraordinary refractive index of the single optical axis anisotropic optical layer is 1.0-2.5, and the refractive index of the isotropic optical layer is 1.0-2.5;

The difference between the refractive index of the isotropic optical layer and the extraordinary refractive index of the single optical axis anisotropic optical layer is 0.01-2.
A display device includes:

Backlight module, used to provide incident light;

A display panel, placed above the backlight module, for receiving the incident light and displaying images;

Wherein, the display panel includes:

A first substrate and a second substrate disposed oppositely;

A first grating layer disposed on the first substrate on the side away from the second substrate;

A display layer provided between the first substrate and the second substrate;

A second grating layer arranged between the display layer and the second substrate;

The optical film layer according to claim 1 arranged between the second grating layer and the second substrate, and the single optical axis anisotropic optical layer is arranged on the side of the second grating layer;

A photoresist layer provided between the optical film layer and the second substrate, or a photoresist layer provided between the first substrate and the display layer.
9. The display device of claim 9, wherein the first grating layer comprises a plurality of strip-shaped metal layers formed on the first substrate, and the plurality of metal layers are spaced apart and arranged in parallel.
9. The display device according to claim 9, wherein the second grating layer comprises a transparent substrate and a plurality of strip-shaped metal layers formed on the transparent substrate, and the plurality of metal layers are spaced apart and arranged in parallel.
10. The display device according to claim 10, wherein the width of the metal layer of the first grating layer is 50nm-150nm, the thickness of the metal layer is 100nm-200nm, and the distance between two adjacent metal layers is 100nm- 200nm.
11. The display device according to claim 11, wherein the width of the metal layer of the second grating layer is 50nm-150nm, the thickness of the metal layer is 100nm-200nm, and the distance between two adjacent metal layers is 100nm- 200nm.
9. The display device of claim 9, wherein the photoresist layer is disposed between the optical film layer and the second substrate, and the display panel further comprises:

A compensation film layer arranged between the display layer and the second grating layer; and

A compensation film layer arranged between the display layer and the first substrate.
The display device according to claim 9, wherein the photoresist layer is disposed between the optical film layer and the second substrate, and the display panel further comprises:

A compensation film layer arranged between the display layer and the second grating layer.
9. The display device of claim 9, wherein the photoresist layer is disposed between the optical film layer and the second substrate, and the display panel further comprises:

A compensation film layer arranged between the display layer and the first substrate.
9. The display device of claim 9, wherein the photoresist layer is provided between the first substrate and the display layer; the display panel further comprises:

A compensation film layer arranged between the display layer and the second grating layer; and

A compensation film layer arranged between the photoresist layer and the first substrate.
9. The display device of claim 9, wherein the photoresist layer is provided between the first substrate and the display layer; the display panel further comprises:

A compensation film layer arranged between the display layer and the second grating layer.
9. The display device of claim 9, wherein the photoresist layer is provided between the first substrate and the display layer; the display panel further comprises:

A compensation film layer arranged between the photoresist layer and the first substrate.