CN107167956B

CN107167956B - Optical film, display device, and terminal device

Info

Publication number: CN107167956B
Application number: CN201710417277.8A
Authority: CN
Inventors: 刘会芬; 黄璐; 唐卫东
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-06-06
Filing date: 2017-06-06
Publication date: 2020-10-09
Anticipated expiration: 2037-06-06
Also published as: CN107167956A

Abstract

The application provides an optical film, a display device and a terminal device. The optical film comprises an inner coupling micro-nano structure and an outer coupling micro-nano structure, wherein the inner coupling micro-nano structure and the outer coupling micro-nano structure are embedded in a matrix of the optical film; the inner coupling micro-nano structure receives incident light from a first area and reflects the incident light to the outer coupling micro-nano structure, and the first area is positioned on one side of the substrate; the outcoupling micro-nano structure reflects the reflected incident light, the reflected incident light is emitted to a second area, and the second area is positioned on the other side of the substrate. The application of the optical film can reduce the black edge when the optical film is attached to the transparent panel of the display device.

Description

Optical film, display device, and terminal device

Technical Field

The present application relates to the field of display technologies, and more particularly, to an optical film, a display device, and a terminal device.

Background

A transparent panel is generally disposed on a surface of the liquid crystal display panel, and a driving circuit is required to be disposed below an edge of the transparent panel for display, so that a portion of an area where an image cannot be displayed, that is, a so-called black edge, appears at (around) the edge of the transparent panel when an image is finally displayed. Since the appearance of the black border may affect the viewing effect of the user and reduce the user experience, it is desirable to provide a method for reducing the black border.

Disclosure of Invention

The application provides an optical film, a display device and terminal equipment, which are used for reducing the black edge of the display device.

In a first aspect, an optical film is provided, the optical film comprising: the optical film comprises an inner coupling micro-nano structure and an outer coupling micro-nano structure, wherein the inner coupling micro-nano structure and the outer coupling micro-nano structure are embedded in a matrix of the optical film; the inner coupling micro-nano structure receives incident light from a first area and reflects the incident light to the outer coupling micro-nano structure, and the first area is positioned on one side of the substrate; the outcoupling micro-nano structure reflects the reflected incident light, the reflected incident light is emitted to a second area, and the second area is located on the other side of the substrate.

Through laminating optical film in this application on display device's transparent panel, can be under the prerequisite that does not change the structure and the assembly process of current display device's display screen for partial light of display module assembly of display device can follow the regional outgoing that non-display area corresponds in the transparent panel after the twice reflection of the interior coupling micro-nano structure and the outer coupling micro-nano structure in optical film, can reduce display device's black border, improve display device's display effect.

With reference to the first aspect, in certain implementation manners of the first aspect, a distance between the inner coupling micro-nano structure and the upper surface of the base is smaller than a distance between the inner coupling micro-nano structure and the lower surface of the base, and a distance between the outer coupling micro-nano structure and the upper surface of the base is larger than a distance between the inner coupling micro-nano structure and the lower surface of the base.

Optionally, the distance between the in-coupling micro-nano structure and the upper surface of the substrate is smaller than the distance between the out-coupling micro-nano structure and the upper surface of the substrate, and the distance between the in-coupling micro-nano structure and the lower surface of the substrate is larger than the distance between the out-coupling micro-nano structure and the lower surface of the substrate.

With reference to the first aspect, in certain implementation manners of the first aspect, an upper surface of the inner coupling micro-nano structure is flush with an upper surface of the base, and a lower surface of the outer coupling micro-nano structure is flush with an upper surface of the base.

By reasonably setting the positions of the inner coupling micro-nano structure and the outer coupling micro-nano structure relative to the base body, the inner coupling micro-nano structure and the outer coupling micro-nano structure can be arranged in a staggered mode (the inner coupling micro-nano structure and the outer coupling micro-nano structure are located at different heights), and therefore the inner coupling micro-nano structure can better reflect received incident light to the outer coupling micro-nano structure. Specifically, in order to enable the in-coupling micro-nano structure to reflect the received incident light to the out-coupling micro-nano structure, the in-coupling micro-nano structure and the out-coupling micro-nano structure cannot be at the same height in the substrate, but are respectively at different heights, otherwise, the in-coupling micro-nano structure cannot reflect the received incident light to the out-coupling micro-nano structure.

With reference to the first aspect, in certain implementation manners of the first aspect, the thicknesses of the in-coupling micro-nano structure and the out-coupling micro-nano structure are both less than 1/10 of the thickness of the substrate.

When the thicknesses of the inner coupling micro-nano structure and the outer coupling micro-nano structure are too large, reflection of incident light rays can be influenced, for example, when the sizes of the inner coupling micro-nano structure and the outer coupling micro-nano structure are close to the thickness of the base body, the inner coupling micro-nano structure cannot reflect the received incident light rays to the outer coupling micro-nano structure (or the reflection effect is poor), and therefore when the thicknesses of the inner coupling micro-nano structure and the outer coupling micro-nano structure are far smaller than the thickness of the base body, the inner coupling micro-nano structure can better reflect the received incident light rays to the outer coupling micro-nano structure.

With reference to the first aspect, in certain implementation manners of the first aspect, the incoupling micro-nano structure includes a plurality of first micro-nano sub-structures, and a minimum distance between every two adjacent first micro-nano sub-structures in the plurality of first micro-nano sub-structures is greater than or equal to a width of each first micro-nano sub-structure in the plurality of first micro-nano sub-structures; each first micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the first micro-nano sub-structure and the bottom surface of the first micro-nano sub-structure is an acute angle, and the reflecting surface of the first micro-nano sub-structure faces the out-coupling micro-nano structure.

By arranging larger intervals among the micro-nano substructures of the inner coupling micro-nano structure, the mutual interference among light rays reflected by different substructures of the inner coupling micro-nano structure can be reduced or avoided, and the reflection effect is improved.

Optionally, the distances between every two adjacent first micro-nano sub-structures in the plurality of first micro-nano sub-structures are the same.

By uniformly arranging the plurality of micro-nano substructures in the in-coupling micro-nano structure, light rays reflected by the in-coupling micro-nano structure to the out-coupling micro-nano structure are uniform reflected light rays.

With reference to the first aspect, in certain implementation manners of the first aspect, a reflectivity of the reflective surface of the first micro-nano sub-structure is 20% to 50%.

The reflectivity of the reflecting surface of the micro-nano substructure of the in-coupling micro-nano structure is reasonably set, so that the in-coupling micro-nano structure can reflect enough light rays to the out-coupling micro-nano structure.

With reference to the first aspect, in certain implementation manners of the first aspect, the outcoupling micro-nano structure includes a plurality of second micro-nano sub-structures, and a maximum distance between any two second micro-nano sub-structures of the plurality of second micro-nano sub-structures is less than or equal to a width of any one second micro-nano sub-structure of the plurality of second micro-nano sub-structures; each second micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the second micro-nano sub-structure and the bottom surface of the second micro-nano sub-structure is an acute angle, and the reflecting surface of the second micro-nano sub-structure faces the in-coupling micro-nano structure.

The small distance is arranged among the micro-nano substructures of the outer coupling micro-nano structure, so that light rays reflected by the inner coupling micro-nano structure can be reflected as much as possible, and the display effect is improved.

Optionally, the distances between any two adjacent sub-structures in the plurality of second micro-nano sub-structures are the same.

By uniformly arranging the micro-nano substructures in the out-coupling micro-nano structure, uniform reflected light rays are finally reflected by the out-coupling micro-nano structure.

With reference to the first aspect, in certain implementation manners of the first aspect, a reflectivity of the reflective surface of the second micro-nano sub-structure is greater than 50%.

The reflecting surface of the micro-nano substructure of the outcoupling micro-nano structure is provided with a larger reflectivity (more than 50%), so that the outcoupling micro-nano structure can reflect light rays reflected by the incoupling micro-nano structure out again as much as possible, and the intensity of the light rays finally reflected by the outcoupling micro-nano structure is increased.

With reference to the first aspect, in certain implementations of the first aspect, the optical film further includes: the first transparent film is attached to the upper surface of the substrate; and the second transparent film is attached to the lower surface of the substrate.

Transparent films are arranged on the upper surface and the lower surface of the base body, so that the inner coupling micro-nano structure and the outer coupling micro-nano structure in the base body can be protected.

In a second aspect, there is provided a display device including: the display device comprises a display module, a transparent panel and the optical film in the first aspect or any implementation manner of the first aspect, wherein the optical film is located between the display module and the transparent panel, and the display module and the optical film are both located on the inner side of the transparent panel; the display module comprises a display area and a non-display area; the optical film comprises an inner coupling micro-nano structure and an outer coupling micro-nano structure; the inner coupling micro-nano structure reflects light rays emitted by the display area to the outer coupling micro-nano structure, the outer coupling micro-nano structure reflects light rays reflected by the inner coupling micro-nano structure to an area, corresponding to the non-display area, in the transparent panel, and the area, where the projection of the non-display area in the plane of the transparent panel is located, of the transparent panel is located in the area, corresponding to the non-display area, in the transparent panel along the direction perpendicular to the plane of the transparent panel.

According to the method and the device, the light emitted from the display area is reflected twice through the inner coupling micro-nano structure and the outer coupling micro-nano structure, and partial light of the display area can be reflected to the area corresponding to the non-display area in the transparent panel, so that the black edge at the edge of the transparent panel can be reduced visually, and the user experience is improved.

With reference to the second aspect, in certain implementations of the second aspect, the display device further includes: a light guide disposed on a side of the display area away from the transparent panel.

Specifically, it is assumed that the transparent panel is located above the display area including an upper surface and a lower surface, wherein the upper surface is in contact with the transparent panel, and the light guide body is located below the lower surface of the display area (the light guide body may be in contact with the lower surface of the display area).

Alternatively, the Light guide may be composed of at least one Light Emitting Diode (LED).

Because the little structure of inner coupling reflects the regional partial light of display to the little structure of outer coupling, consequently, the intensity of the regional outgoing light that corresponds with the display area in the transparent panel has the weakening of certain degree, carries out the light compensation through setting up the light conductor below the display area, guarantees the intensity of the regional outgoing light that transparent panel and display area correspond, guarantees display effect.

With reference to the second aspect, in some implementations of the second aspect, along a direction perpendicular to a plane in which the display area is located, a projection of the light guide body in the plane in which the display area is located in an edge area of the display area adjacent to the non-display area.

Because the in-coupling micro-nano structure mainly reflects the light emitted from the edge area adjacent to the non-display area in the display area to the out-coupling micro-nano structure, the light emitted from the edge area in the display area can be obviously weakened relative to other areas in the display area, and the light emitted from the edge area can be better compensated by directly arranging the light guide body in the edge changing area.

In combination with the second aspect, in some implementation manners of the second aspect, along a direction perpendicular to a plane where a display area of the display module is located, a projection of the in-coupling micro-nano structure in the plane where the display area of the display module is located in the display area, and a projection of the out-coupling micro-nano structure in the plane where the display area of the display module is located in the non-display area.

When the projection of in-coupling micro-nano structure and outer coupling micro-nano structure on the plane at display module group place is located display area and non-display area respectively, the light of display area outgoing can be received well to in-coupling micro-nano structure, thereby can be better with the partial light reflection in the display area to outer coupling micro-nano structure, and outer coupling micro-nano structure can be with the direct outgoing of non-display area top of light that inner coupling micro-nano structure reflected come, thereby illuminate the transparent panel of non-display area top, reduce the black border.

With reference to the second aspect, in some implementations of the second aspect, the display area and the non-display area are located on a same plane.

With reference to the second aspect, in certain implementation manners of the second aspect, the in-coupling micro-nano structure includes a plurality of first micro-nano sub-structures, and a minimum distance between every two adjacent first micro-nano sub-structures in the plurality of first micro-nano sub-structures is greater than or equal to a width of each first micro-nano sub-structure in the plurality of first micro-nano sub-structures; each first micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the first micro-nano sub-structure and the bottom surface of the first micro-nano sub-structure is an acute angle, and the reflecting surface of the first micro-nano sub-structure faces the out-coupling micro-nano structure.

With reference to the second aspect, in certain implementation manners of the second aspect, in a thickness direction of the transparent panel, a sum of projection areas of the plurality of first micro-nano sub-structures in the display area is 20% to 50% of an area of the display area.

The projection area of a plurality of micro-nano substructures in the inner coupling micro-nano structure above a display area needs to be controlled within a certain range, if the projection area is too large, the brightness of emergent rays above the display area can be seriously weakened, and if the projection area is very small, the rays reflected to the outer coupling micro-nano structure by the inner coupling micro-nano structure are very limited, so that the brightness of emergent rays in an area corresponding to a non-display area in the transparent panel is influenced.

With reference to the second aspect, in certain implementation manners of the second aspect, an acute included angle formed between the reflection surface of the first micro-nano structure and a plane where the display area is located is 22.5 degrees to 43.57 degrees.

By setting a certain included angle, the light emitted by the display area can be reflected to the reflecting surface of the outer coupling micro-nano structure by the reflecting surface of the inner coupling micro-nano structure.

With reference to the second aspect, in some implementation manners of the second aspect, the outcoupling micro-nano structure includes a plurality of second micro-nano sub-structures, and a maximum distance between any two second micro-nano sub-structures of the plurality of second micro-nano sub-structures is less than or equal to a width of any one second micro-nano sub-structure of the plurality of second micro-nano sub-structures; each second micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the second micro-nano sub-structure and the bottom surface of the second micro-nano sub-structure is an acute angle, and the reflecting surface of the second micro-nano sub-structure faces the in-coupling micro-nano structure.

With reference to the second aspect, in certain implementation manners of the second aspect, along the thickness direction of the transparent panel, the projection area of the plurality of second micro-nano sub-structures in the non-display area is 50% to 100% of the area of the non-display area.

For the external coupling micro-nano structure, the light reflected by the internal coupling micro-nano structure is mainly reflected again and then output from the region corresponding to the non-display region in the transparent panel, therefore, the larger the projected area of the external coupling micro-nano structure above the non-display region is, the better the external coupling micro-nano structure is, the more the light reflected by the internal coupling micro-nano structure can be reflected, and the display effect is improved.

With reference to the second aspect, in certain implementation manners of the second aspect, an acute included angle formed between the reflection surface of the second micro-nano structure and a plane where the non-display area is located is 22.5 degrees to 43.57 degrees.

Through setting up certain contained angle, can ensure that the plane of reflection of outer coupling micro-nano structure can follow the regional outgoing that non-display area corresponds in the transparent panel after reflecting light that the plane of reflection of inner coupling micro-nano structure was come again.

In a third aspect, a terminal device is provided, where the terminal device includes a housing and a display device in any implementation manner of the second aspect and the second aspect, where the display device is located inside the housing.

The inner coupling micro-nano structure and the outer coupling micro-nano structure are arranged in the display device in the terminal equipment, light rays emitted from the display area can be reflected twice, and partial light rays of the display area can be reflected to the area corresponding to the non-display area in the transparent panel, so that black edges at the edge of the transparent panel can be reduced, and user experience is improved.

Drawings

Fig. 1 is a schematic view of a conventional display device.

FIG. 2 is a schematic view of an optical film of an embodiment of the present disclosure.

Fig. 3 is a schematic diagram of an in-coupling micro-nano structure and an out-coupling micro-nano structure in an optical film according to an embodiment of the present application.

FIG. 4 is a schematic view of an optical film of an embodiment of the present disclosure.

Fig. 5 is a schematic diagram of a display device according to an embodiment of the present application.

Fig. 6 is a schematic diagram of an in-coupling micro-nano structure and an out-coupling micro-nano structure in a display device according to an embodiment of the present application.

Fig. 7 is a schematic diagram of an in-coupling micro-nano structure and an out-coupling micro-nano structure in an embodiment of the present application.

Fig. 8 is a schematic diagram of a display device according to an embodiment of the present application.

Fig. 9 is a schematic diagram illustrating luminance effects of the display device according to the embodiment of the present application.

Fig. 10 is a schematic diagram of an in-coupling micro-nano structure in an embodiment of the present application.

Fig. 11 is a schematic diagram of an outcoupling micro-nano structure in an embodiment of the present application.

Fig. 12 is a schematic diagram of fabricating an in-coupling micro-nano structure and an out-coupling micro-nano structure in an embodiment of the present application.

Fig. 13 is a schematic diagram of an in-coupling micro-nano structure and an out-coupling micro-nano structure in an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

For better understanding of the display device according to the embodiment of the present application, a brief description of a conventional display device will be given below with reference to fig. 1.

Fig. 1 is a schematic structural diagram of a conventional display device. The display device 100 may be located in a terminal device (e.g., a mobile phone, a tablet computer, and other electronic devices including a liquid crystal display). As shown in fig. 1, the display device 100 includes a B-shell 101 (back surface housing), an a-shell 102 (front surface housing), a display module 104, and a transparent panel 105. The display module 104 and the transparent panel 105 are connected together by an Optically Clear Adhesive (OCA), and the transparent panel 105 and the a shell 102 are connected together by an Adhesive 103 (specifically, an OCA Adhesive). The area where the display module 104 contacts the transparent panel 105 is a display screen 107 of the display module 104, and since the display module 104 has the driving circuit 106, the display screen 107 is divided into a non-display area 108 and a display area 109, wherein the non-display area 108 is located above the driving circuit 106. Since the display area 109 itself can emit the light 110, but the non-display area 108 itself cannot emit the light, the area 112 of the transparent panel 107 corresponding to the display area 109 is an area capable of normally displaying images, and the area 111 of the transparent panel 107 corresponding to the non-display area 108 forms a black border due to very weak emitted light. Specifically, the region 112 of the transparent panel 107 corresponding to the display region 109 may be a region of the transparent panel above the display region 109, and the region 111 of the transparent panel 107 corresponding to the non-display region 108 may be a region above a gap region (a certain gap region is formed between the transparent panel 107, the display module 104 and the a-shell 102 due to the existence of material structure and assembly tolerance) of the transparent panel on the left side of the non-display region 108 and the non-display region 108.

In order to improve user experience and reduce black edges generated in an area corresponding to a non-display area in a transparent panel of a display device as much as possible, the application provides an optical film. The optical film comprises an inner coupling micro-nano structure and an outer coupling micro-nano structure, when the optical film is placed between a transparent panel and a display module of a display device, emergent light of a display area of the display module can be reflected to the outer coupling micro-nano structure by the inner coupling micro-nano structure, and then the light reflected by the inner coupling micro-nano structure is reflected by the outer coupling micro-nano structure to be emitted from an area corresponding to a non-display area in the transparent panel, so that a black edge located in the edge area of the transparent panel is reduced, and the display effect is improved.

FIG. 2 is a schematic view of an optical film of an embodiment of the present disclosure. The optical film 200 includes:

an in-coupling micro-nano structure and an out-coupling micro-nano structure, as shown in fig. 2, both embedded in the substrate of the optical film 200.

The in-coupling micro-nano structure receives incident light from a first area of the optical film and reflects the incident light to the out-coupling micro-nano structure; and the outcoupling micro-nano structure reflects the reflected incident light again, and the reflected incident light emits to the second area. Wherein the first region is located on one side of the substrate of the optical film and the second region is located on the other side of the substrate of the optical film. Further, as shown in fig. 2, the first region may be located below the in-coupling micro-nano structure, and the second region may be located above the out-coupling micro-nano structure.

Through laminating optical film in this application on display device's transparent panel, can be under the prerequisite that does not change the structure and the assembly process of current display device's display screen for the regional outgoing that can follow non-display area in the transparent panel after the twice reflection of the interior coupling micro-nano structure and the outer coupling micro-nano structure in optical film of display device's display module's display area's partial light, can reduce the black limit at display device's transparent panel edge, improve display device's display effect.

The optical film may be a nearly transparent film, and the optical film may have a transmittance of 90% or more, and may have a thickness of 0.2 to 0.5 mm.

It is to be understood that the optical film 200 described above may be provided in the display device 100 as shown in fig. 1. Specifically, the optical film 200 may be disposed between the display module 104 and the transparent panel 105, and further, the optical film 200 may be attached to the lower surface of the transparent panel 105 and the upper surface of the display module 104. When the optical film 200 is disposed between the display module 104 and the transparent panel 105, the following two conditions may be specifically satisfied:

(1) along the direction perpendicular to the plane where the display area 109 and the non-display area 108 of the display module 104 are located, the projection of the in-coupling micro-nano structure on the plane where the display area 109 and the non-display area 108 of the display area 104 are located in the display area 109;

(2) along the direction perpendicular to the plane where the display area 109 and the non-display area 108 of the display module 104 are located, the projection of the outcoupling micro-nano structure on the plane where the display area 109 and the non-display area 108 of the display area 104 are located in the non-display area 108.

Further, the reflection effect on light rays is better when the distances between the inner coupling micro-nano structure and the outer coupling micro-nano structure and the upper surface and the lower surface of the substrate meet certain conditions. Specifically, the distance between the inner coupling micro-nano structure and the upper surface of the base body is smaller than the distance between the inner coupling micro-nano structure and the lower surface of the base body, and the distance between the outer coupling micro-nano structure and the upper surface of the base body is larger than the distance between the inner coupling micro-nano structure and the lower surface of the base body. Or the distance between the inner coupling micro-nano structure and the upper surface of the substrate is smaller than the distance between the outer coupling micro-nano structure and the upper surface of the substrate, and the distance between the inner coupling micro-nano structure and the lower surface of the substrate is larger than the distance between the outer coupling micro-nano structure and the lower surface of the substrate.

In addition, when the in-coupling micro-nano structure and the out-coupling micro-nano structure are arranged in the base body, the upper surface of the in-coupling micro-nano structure can be flush with the upper surface of the base body, and the lower surface of the out-coupling micro-nano structure is flush with the upper surface of the base body.

By reasonably setting the positions of the inner coupling micro-nano structure and the outer coupling micro-nano structure relative to the base body, the inner coupling micro-nano structure and the outer coupling micro-nano structure can be arranged in a staggered mode (the inner coupling micro-nano structure and the outer coupling micro-nano structure are located at different heights), and therefore the inner coupling micro-nano structure can better reflect received incident light to the outer coupling micro-nano structure. Specifically, in order to enable the in-coupling micro-nano structure to reflect the received incident light to the out-coupling micro-nano structure, the in-coupling micro-nano structure and the out-coupling micro-nano structure cannot be at the same height in the substrate, otherwise, the in-coupling micro-nano structure cannot reflect the received incident light to the out-coupling micro-nano structure.

Optionally, the thicknesses of the in-coupling micro-nano structure and the out-coupling micro-nano structure are both less than 1/10 of the thickness of the substrate.

It is to be understood that the thickness of the in-coupling micro-nano structure and the out-coupling micro-nano structure may be a length of the in-coupling micro-nano structure and the out-coupling micro-nano structure along a thickness direction of a substrate of the optical film.

Optionally, the in-coupling micro-nano structure includes a plurality of first micro-nano sub-structures (the in-coupling micro-nano structure is composed of a plurality of first micro-nano sub-structures), and the minimum distance between every two adjacent first micro-nano sub-structures in the plurality of first micro-nano sub-structures is greater than or equal to the width of each first micro-nano sub-structure in the plurality of first micro-nano sub-structures; in addition, each first micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the first micro-nano sub-structure and the bottom surface of the first micro-nano sub-structure is an acute angle, and the reflecting surface of the first micro-nano sub-structure faces the outer coupling micro-nano structure.

Optionally, the outcoupling micro-nano structure includes a plurality of second micro-nano sub-structures (the outcoupling micro-nano structure is composed of a plurality of second micro-nano sub-structures), and a maximum distance between any two second micro-nano sub-structures in the plurality of second micro-nano sub-structures is smaller than or equal to a width of any one second micro-nano sub-structure in the plurality of second micro-nano sub-structures; in addition, each second micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the second micro-nano sub-structure and the bottom surface of the second micro-nano sub-structure is an acute angle, and the reflecting surface of the second micro-nano sub-structure faces the inner coupling micro-nano structure.

It is to be understood that the width of the first micro-nano sub-structure may be defined in the following two ways.

The first method is as follows:

and along the direction perpendicular to the plane of the upper surface of the base body, the width of the projection of the first micro-nano sub structure in the plane of the upper surface of the base body is the width of the first micro-nano sub structure.

The second method comprises the following steps:

and the length of the short side of the rectangular projection of the first micro-nano sub-structure in the plane of the upper surface of the base body is along the direction perpendicular to the plane of the upper surface of the base body.

Similarly, the width of the first micro-nano sub-structure can also be defined according to the first mode and the second mode.

As shown in fig. 3, the in-coupling micro-nano structure is composed of four first micro-nano sub-structures, the out-coupling micro-nano structure is composed of four second micro-nano sub-structures, and as can be seen from fig. 3, the distance between every two adjacent first micro-nano sub-structures is larger than the width of any one first micro-nano sub-structure; the out-coupling micro-nano structure comprises 4 second micro-nano sub structures, and the distance between every two adjacent second micro-nano sub structures is smaller than the width of any one second micro-nano sub structure; in addition, in fig. 3, the first micro-nano sub structure and the second micro-nano sub structure both include reflecting surfaces, the minimum included angles between the reflecting surfaces and the ground of the corresponding micro-nano sub structure are acute angles, and the reflecting surfaces of the first micro-nano sub structure and the second micro-nano sub structure are oppositely arranged.

Optionally, the reflectivity of the reflecting surface of the first micro-nano sub-structure is 20% to 50%.

Optionally, the reflectivity of the reflecting surface of the second micro-nano sub-structure is greater than 50%.

In order to protect the in-coupling micro-nano structure and the out-coupling micro-nano structure in the optical film, the optical film 200 may further include a first transparent film and a second transparent film, wherein the first transparent film is attached to the upper surface of the substrate, and the second transparent film is attached to the lower surface of the substrate.

Transparent films are arranged on the upper surface and the lower surface of the base body of the optical film 200, so that the inner coupling micro-nano structure and the outer coupling micro-nano structure in the base body can be protected.

The first transparent film and the second transparent film may also be referred to as a first protective layer and a second protective layer, the protective layer is made of an optically transparent material, and may be made of glass or optical resin, for example, the protective layer may be made of one or more of Polyethylene terephthalate (PET), Polycarbonate (PC), and polymethyl methacrylate (PMMA), and the surface of the first protective layer or the second protective layer may be provided with a hardening coating. The total thickness of the first protective layer or the second protective layer may be between 0.3mm and 0.8 mm.

For example, as shown in fig. 4, a substrate 1002 (alternatively referred to as a main structure) of an optical film 1001 includes an in-coupling micro-nano structure and an out-coupling micro-nano structure, the optical film 1001 further includes a transparent protection layer 1004 and a transparent protection layer 1006, and a user protects the in-coupling micro-nano structure and the out-coupling micro-nano structure in the optical film. The left view in fig. 4 is a plan view of the optical film 1001, and the right view is a sectional view of the optical film 1001.

Fig. 5 is a schematic diagram of a display device according to an embodiment of the present application. The display device 300 includes:

a display module 204, a transparent panel 206, and the optical film 200.

The optical film 200 is located in the space 205 between the display module 204 and the transparent panel 206, the optical film 200 is located below the transparent panel 206, and the display module 204 is located below the optical film 200, that is, the display module 204 and the optical film 200 are both located inside the transparent panel 206.

In addition, the display module 204 includes a display screen 208, and the display screen 208 includes a non-display area 209 and a display area 210, wherein the non-display area 209 does not emit light, and the light emitted from the display area 210 is 211.

The optical film 200 includes an in-coupling micro-nano structure and an out-coupling micro-nano structure, wherein the in-coupling micro-nano structure reflects light emitted from the display region 210 to the out-coupling micro-nano structure, and the out-coupling micro-nano structure reflects light reflected from the in-coupling micro-nano structure to a region 212 corresponding to a non-display region in the transparent panel 206, wherein, along a direction perpendicular to a plane of the transparent panel, a region in which a projection of the non-display region in the plane of the transparent panel is a region corresponding to the non-display region in the transparent panel, or the region corresponding to the non-display region in the transparent panel may further include a region in which a projection of a void region adjacent to the non-display region in the plane of the transparent panel is along a direction perpendicular to the plane of the transparent panel.

Referring to fig. 5, the region of the transparent panel corresponding to the display region or the non-display region will be described, and as shown in fig. 5, the transparent panel 206 is divided into a region corresponding to the display region 210 and a display region corresponding to the non-display region 209 according to the correspondence relationship between the display region 210 and the non-display region 209. The region 213 of the transparent panel 209 corresponding to the display region 209 may be a region of the transparent panel 206 directly above the display region 210, and the region 212 of the transparent panel 206 corresponding to the non-display region 209 may be a region directly above the non-display region 209 and a gap region on the left side of the non-display region 209, or a region of the transparent panel 206 corresponding to the non-display region other than the region corresponding to the display region.

As shown in fig. 6, an in-coupling micro-nano structure 301 and an out-coupling micro-nano structure 401 are placed in a space 205 of a display device 300, a display region 210 emits light 210, when the light 210 passes through the in-coupling micro-nano structure 301, a part of the light passes through the in-coupling micro-nano structure and a transparent panel 206 to be emitted (the light emitted from the region corresponding to the display region in the transparent panel is 211), the other part of the light is reflected to the out-coupling micro-nano structure 401 by the in-coupling micro-nano structure 301 (the light reflected to the out-coupling micro-nano structure by the in-coupling micro-nano structure is 212), and then the light 212 reflected by the in-coupling micro-nano structure 301 is reflected again by the out-coupling micro-nano structure 401, so that the light reflected by the out-coupling micro-nano structure.

Because the light reflected by the out-coupling micro-nano structure is arranged in the region corresponding to the non-display region in the transparent panel, more light is emitted from the region corresponding to the non-display region in the transparent panel, and the black edge of the transparent panel can be reduced.

In the application, the light emergent from the display area is reflected twice through the inner coupling micro-nano structure and the outer coupling micro-nano structure, and partial light of the display area can be reflected to the area corresponding to the non-display area in the transparent panel, so that the black edge at the edge of the transparent panel can be reduced visually, and the user experience is improved.

It should be understood that, in the display device of the present application, only the in-coupling micro-nano structure and the out-coupling micro-nano structure may be included between the transparent panel and the display module, that is, the display device of the present application may not include the optical film, but directly include the in-coupling micro-nano structure and the out-coupling micro-nano structure. And the inner coupling micro-nano structure can be fixed on the transparent panel, and the outer coupling micro-nano structure is fixed on the display module.

As shown in fig. 7, the in-coupling micro-nano structure 602 and the out-coupling micro-nano structure 603 may be disposed on a surface of the optical film 601 (or may be disposed inside the optical film 601, where the surface of the optical film 601 is taken as a specific example), and in a specific implementation, the optical film 601 may be disposed between a transparent panel and a display screen of a display device, so that the in-coupling micro-nano structure 602 is located above a display area, and the out-coupling micro-nano structure 603 is located above a non-display area. Further, when the optical film 601 is placed, the distances between the in-coupling micro-nano structure 602 and the out-coupling micro-nano structure 603 from the boundary between the display region and the non-display region can be made equal. In addition, the widths of the in-coupling micro-nano structure 602 and the out-coupling micro-nano structure 603 can be between 0.2 mm and 1.0 mm.

It is to be understood that the above-described display area may be a partial display area among all display areas in the entire display screen, for example, the above-described display area may be a partial display area near a non-display area. The non-display area may be a partial non-display area in the entire non-display area of the display screen, and for example, the non-display area may be a partial non-display area near a side of the display screen.

Because the in-coupling micro-nano structure reflects part of light rays in the display area to the area of the transparent panel above the non-display area for output, the brightness of the light rays emitted from the area of the transparent panel above the display area is reduced, and in order to compensate the light rays emitted from the area of the transparent panel above the display area, the light guide body can be arranged on one side of the display area far away from the transparent panel.

Specifically, assuming that the transparent panel is located above the display area, which includes an upper surface and a lower surface, the upper surface of the display area is the side close to the transparent panel, and the lower surface of the display area is the side away from the transparent panel, and at this time, the light guide is disposed on the lower surface of the display area, and specifically, the light guide is disposed below the lower surface of the display area. Further, the light guide may be composed of at least one LED.

Because the in-coupling micro-nano structure reflects part of light rays of the display area to the out-coupling micro-nano structure, the intensity of light rays emitted from the area corresponding to the display area in the transparent panel can be weakened to a certain degree, light compensation is carried out by arranging the light guide body below the display area, the intensity of light rays emitted from the area corresponding to the display area of the transparent panel is ensured, and the display effect is improved.

Further, along a direction perpendicular to a plane in which the display area is located, a projection of the light guide body in the plane in which the display area is located in an edge area adjacent to the non-display area in the display area.

Next, how to perform the light compensation using the light guide will be described with reference to fig. 8. As shown in fig. 8, the display device 400 includes: display screen 1101, backlight plate 1106, controller 1109. The display screen 1101 corresponds to the display screen 208 in the display device 400, and the display screen 1101 also includes a display area and a non-display area. The display screen 1101 is connected to the controller 1109, the controller 1109 outputs an image control signal to the display screen 1101, and the display screen outputs image information after receiving the image control signal from the controller 1109. The display screen 1101 includes an edge area 1102 (an area where a non-display area of the display screen 1101 is located), and a bar light guide 1108 located below the edge area 1102 (specifically, the light guide 1108 may be disposed on a lower surface of the edge area 1102), where the bar light guide 1108 includes at least one LED light bulb 1103 and is used for performing light compensation on the display area in the display screen to ensure brightness of light emitted from an area corresponding to the display area in the transparent panel. In addition, the display device 400 further includes a stripe light guide backlight driving circuit 1110 and a backlight driving circuit 1111. The controller 1109 lights up the backlight plate 1106 by controlling the backlight plate driving circuit 1111 to output current pulses to the lamp group 1107 on the backlight plate 1106, and the controller 1109 controls the bar light guide backlight driving circuit 1110 to output current pulses to at least one LED lamp 1103 of the bar light guide 1108 (the LED lamp 1103 is a light source of the bar light guide 1108) for performing light compensation on a display area located in an edge area of the display screen.

In order to detect the intensity of the emitted light, the display device 400 further includes a light intensity sensor 1112, a light intensity sensor 1113, and a light intensity sensor 1114, which function as follows: the light intensity sensor 1112 is used for measuring the intensity of the external environment light, and the controller 1109 can adjust and control the light 1104 emitted by the backlight plate 1106 through a light intensity signal fed back by the light intensity sensor 1112; the light intensity sensor 1113 is used for measuring the brightness 1104 of the backlight plate 1106, and the controller 1109 can adjust the light 1105 emitted by the strip light guide 1108 through a light intensity signal fed back by the light intensity sensor 1113; the light intensity sensor 1114 may be installed on the optical path of the light 1105 emitted from the bar light guide 1108, as shown in fig. 8, the light intensity sensor 1114 may be installed at a position 1120 outside the display screen for detecting the brightness of the light in the edge area of the display screen, and the controller 1109 may also take into account the light intensity signal fed back by the light intensity sensor 1114 when adjusting the light intensity of the backlight 1106 and the bar light guide 1108.

Therefore, by arranging the bar-shaped light guide body 1108 below the display area, light compensation can be performed on the display area of the display device 400, so that the brightness of light emitted from the area corresponding to the display area in the transparent panel can still meet certain requirements, and therefore when the black edge of the transparent panel is reduced, the brightness of light in the area corresponding to the display area in the transparent panel can be ensured, and user experience is improved.

Specifically, the

light intensity sensors

1112, 1113, and 1114 may be integrated with a photoelectric converter and a digital-to-analog converter, where the photoelectric sensor is configured to convert an optical signal of the detection area into an electrical signal and output the electrical signal to the digital-to-analog converter, the digital-to-analog converter quantizes the electrical signal and outputs the quantized electrical signal to the controller 1109, and the controller 1109 may compare the brightness of the light of the detection area obtained from the digital-to-analog converter with a preset brightness and generate a closed-loop control signal according to a comparison result, so as to control the driving

circuits

1110 and 1111 to control the light emission intensities of the backlight plate 1106 and the strip light guide 1108.

The display effect of the display device 400 is shown in fig. 9, and in fig. 9, the light emitted from the backlight 1201 overlaps the stripe light guide 1202, and thus a light overlapping region is formed in the region where the stripe light guide 1202 is located. Specifically, the light emitted by the backlight plate 1201 is 1203, the corresponding luminance curve is 1206, the controller 1109 controls the strip light guide 1202 to emit light 1204 with the same or similar intensity, and the light emitted by the backlight plate 1201 and the light emitted by the strip light guide 1202 are superimposed to form light 1205, and the corresponding luminance curve is 1207. Since the in-coupling micro-nano structure and the out-coupling micro-nano structure are respectively arranged above the display area and the non-display area, after the light ray 1205 is reflected by the in-coupling micro-nano structure and the out-coupling micro-nano structure, the emergent range of the light ray is enlarged (the light ray is also emitted from the area of the transparent panel corresponding to the non-display area), the brightness of the light ray is reduced (taking the brightness is reduced by half as an example), the brightness of the light ray emitted from the area of the transparent panel corresponding to the non-display area is the same as the brightness of the light ray emitted from the area of the transparent panel corresponding to the display area, and the brightness curves of the light ray emitted from the area of the transparent panel corresponding to the display area and the.

It should be understood that the backlight or the strip light guide may include one or more LEDs, and the LEDs may be connected in parallel or in series, or in a combination of series and parallel.

Optionally, when the display screen of the display device 300 is an Organic Light Emitting Diode (OLED) display screen, the display device 300 may be further simplified because a backlight module is not needed, for example, the display device 300 may remove the backlight driving circuit 1111 and the strip Light guide body 1110 shown in fig. 8, and the controller 1109 controls the driving current of the pixel units at the in-coupling micro-nano structure and the out-coupling micro-nano structure of the display module, so as to increase the Light intensity, thereby performing Light compensation on the display area.

Further, for the OLED display screen capable of actively emitting light, the luminance curve 1207 may be set to be a decreasing or increasing curve or straight line, so that the light path can be more smoothly output after being reflected by the in-coupling micro-nano structure and the out-coupling micro-nano structure, and the luminance of the light ray is not changed suddenly.

In addition, when the luminance of the OLED display screen is above 50%, it is difficult to double the luminance of the display area by adjusting the driving current of the pixel unit, and at this time, the bar light guide 1108 may be continuously disposed below the display area to adjust the luminance of light in a wider range, specifically, the bar light guide may be closed when the luminance of the OLED display screen is below 50%, the luminance of light may be adjusted only by adjusting the driving current of the pixel unit, and when the luminance of the display screen exceeds 50%, the bar light guide may be opened, and the luminance of the display screen may be adjusted by adjusting the driving current of the pixel unit and the light emission of the bar light guide.

Optionally, the in-coupling micro-nano structure comprises a plurality of first micro-nano sub-structures, and the minimum distance between every two adjacent first micro-nano sub-structures in the plurality of first micro-nano sub-structures is greater than or equal to the width of each first micro-nano sub-structure in the plurality of first micro-nano sub-structures; in addition, each first micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the first micro-nano sub-structure and the bottom surface of the first micro-nano sub-structure is an acute angle, and the reflecting surface of the first micro-nano sub-structure faces the outer coupling micro-nano structure.

Optionally, the outcoupling micro-nano structure includes a plurality of second micro-nano sub-structures, and a maximum distance between any two of the plurality of second micro-nano sub-structures is smaller than or equal to a width of any one of the plurality of second micro-nano sub-structures; in addition, each second micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the second micro-nano sub-structure and the bottom surface of the second micro-nano sub-structure is an acute angle, and the reflecting surface of the second micro-nano sub-structure faces the inner coupling micro-nano structure.

It should be understood that the width of the first micro-nano sub-structure may be a width of a projection of the first micro-nano sub-structure in a plane of the upper surface of the substrate along a direction perpendicular to the plane of the upper surface of the substrate, and the width of the first micro-nano sub-structure may also be a length of a short side of a rectangular projection of the first micro-nano sub-structure in the plane of the upper surface of the substrate. The width of the second micro-nano sub-structure is similar to that of the first micro-nano sub-structure.

For example, in fig. 6, an in-coupling micro-nano structure 301 and an out-coupling micro-nano structure 401 each comprise a plurality of micro-nano sub-structures.

By arranging larger intervals among the micro-nano substructures of the inner coupling micro-nano structure, the mutual interference among light rays reflected by different substructures of the inner coupling micro-nano structure can be reduced or avoided, and the reflection effect is improved. This is because the larger the distance between the micro-nano substructures of the in-coupling micro-nano structure is, the less the light rays reflected between the adjacent substructures are blocked or interfered.

In addition, the small distance is arranged among the micro-nano substructures of the out-coupling micro-nano structure, so that light rays reflected by the in-coupling micro-nano structure can be reflected as much as possible, and the display effect is improved. It should be understood that the in-coupling micro-nano structure reflects part of light rays of the display area to the out-coupling micro-nano structure, so that the distance between a plurality of micro-nano sub-structures in the in-coupling micro-nano structure cannot be too small, otherwise most of light rays in the display area can be reflected to the out-coupling micro-nano structure, and the brightness of light rays emitted from the area corresponding to the display area in the transparent panel is seriously weakened, so that the distance between the plurality of micro-nano sub-structures in the in-coupling micro-nano structure is set to be appropriately larger. For the outcoupling micro-nano structure, the outcoupling micro-nano structure needs to reflect light rays reflected by the incoupling micro-nano structure to an area above a non-display area in the transparent panel as much as possible to be emitted, so that the smaller the distance between a plurality of micro-nano substructures included in the outcoupling micro-nano structure is, the better the distance is, and thus the outcoupling micro-nano structure can emit the light rays reflected by the incoupling micro-nano structure from the transparent panel to the non-display area as much as possible, so that the brightness of the light rays emitted from the area is enhanced, and the display effect is improved.

For example, as shown in fig. 6, the in-coupling micro/nano structure 301 includes a plurality of micro/nano sub structures directly above the display region, and the out-coupling micro/nano structure 401 also includes a plurality of micro/nano sub structures above the non-display region.

When a plurality of micro-nano substructures of the in-coupling micro-nano structure are positioned right above the display area, part of light rays in the display area can be better reflected to the out-coupling micro-nano structure. Specifically, if the in-coupling micro-nano structure is located above the non-display area, the in-coupling micro-nano structure cannot receive direct light of the display area, and at most, only a small part of the non-direct light of the display area can be received.

When a plurality of micro-nano substructures of the out-coupling micro-nano structure are positioned above the non-display area, part of light rays reflected by the in-coupling micro-nano structure can be better emitted out of the area corresponding to the non-display area.

Furthermore, the plurality of micro-nano sub-structures of the outcoupling micro-nano structure can be positioned above the non-display area and above a gap area between the non-display area and the transparent panel, so that the area where the outcoupling micro-nano structure is positioned is expanded, the reflection area of the outcoupling micro-nano structure is increased, and the reflection effect of the outcoupling micro-nano structure is enhanced.

Optionally, a projection of the plurality of first micro-nano sub-structures in the in-coupling micro-nano structure above the display area 210 is 20% to 50% of an area of the display area 210. The projection of the plurality of second micro-nano sub-structures of the out-coupling micro-nano structure above the non-display region 209 is 50% -100% of the area of the display region 508.

Specifically, the projection area of a plurality of first micro-nano sub-structures in the in-coupling micro-nano structure above the display area 210 needs to be controlled within a certain range, if the projection area is too large, the brightness of emergent light above the display area 210 is seriously weakened, and if the projection area is very small, the light reflected by the in-coupling micro-nano structure to the out-coupling micro-nano structure is very limited, so that the brightness of emergent light in an area corresponding to a non-display area in the transparent panel is influenced.

For the out-coupling micro-nano structure, the light reflected by the in-coupling micro-nano structure is mainly reflected again and then output from the region corresponding to the non-display region in the transparent panel, so that the larger the projected area of the plurality of second micro-nano substructures of the out-coupling micro-nano structure above the non-display region, the better the projected area is, the more the light reflected by the in-coupling micro-nano structure can be reflected as much as possible, and the display effect is improved.

Optionally, an acute included angle formed between the reflection surface of the first micro-nano sub structure and the reflection surface of the second micro-nano sub structure and the plane of the display area ranges from 22.5 degrees to 43.75 degrees.

Through setting up certain contained angle, can ensure that the plane of reflection of incoupling micro-nano structure can reflect the light that the display area launches to the plane of reflection of outcoupling micro-nano structure, the plane of reflection of outcoupling micro-nano structure can reflect the light that the plane of reflection of incoupling micro-nano structure came back again and follow the regional outgoing that non-display area corresponds in the transparent panel.

Further, an acute angle included angle formed by the reflecting surface of the first micro-nano sub structure and the plane where the display area is located is the same as an acute angle included angle formed by the reflecting surface of the second micro-nano sub structure and the plane where the display area is located. At the moment, partial light rays in the display area can be reflected and deviated through two reflections of the inner coupling micro-nano structure and the outer coupling micro-nano structure, and then are emitted out of the transparent panel above the non-display area in a parallel or approximately parallel mode.

Optionally, a specific shape of the plurality of first micro-nano sub-structures included in the in-coupling micro-nano structure may be a triangle (specifically, a right triangle).

For example, as shown in fig. 10, a first micro-nano sub-structure in the in-coupling micro-nano structure is in a right-angled triangle shape, a left drawing in fig. 10 is a top view of the in-coupling micro-nano structure, and a right drawing in fig. 10 is a cross-sectional view of the in-coupling micro-nano structure, and since the first micro-nano sub-structure is in a triangle shape, a projection of the first micro-nano sub-structure on the optical film 703 is a rectangle (a length of the rectangle is a length of the first micro-nano sub-structure), and a cross-section of the first coupling micro-nano structure 701 is a triangle, wherein a side of the triangle in a horizontal direction is a width of the first coupling micro-nano sub-structure, and a side of the triangle in a vertical. The length of the first coupling micro-nano sub-structure can be 1-10um, the width is 1-10um, and the depth is 1-10 um.

In fig. 10, the area of the right triangles is smaller than that of the optical film, so that the right triangles can only reflect a part of the light in the display region from the display region to the out-coupling micro-nano structure, and the region corresponding to the display region in the transparent panel can be ensured to be output by enough light.

Optionally, the specific shape of the plurality of second micro-nano sub-structures included in the outcoupling micro-nano structure may also be a triangle (specifically, a right triangle).

For example, as shown in fig. 11, the second coupling micro-nano structure is in a right triangle shape, in fig. 11, the left drawing is a top view of the outcoupling micro-nano structure, the right drawing is a cross-sectional view of the outcoupling micro-nano structure, and since the second micro-nano structure is in a triangle shape, the projection of the second coupling micro-nano structure on the optical film 703 is a rectangle (the length of the rectangle is the length of the second coupling micro-nano structure), and the cross-section of the second coupling micro-nano structure 701 is a triangle, wherein the side of the triangle in the horizontal direction is the width of the second coupling micro-nano structure, and the side of the triangle in the vertical direction is the depth of the second coupling micro-nano structure. The length of the second coupling micro-nano substructure can be 1-10um, the width is 1-10um, and the depth is 1-10 um.

In fig. 11, the area occupied by all the micro-nano sub-structures in the out-coupling micro-nano structure is relatively close to the area of the optical film, so that the light reflected by the in-coupling micro-nano structure can be reflected out of the transparent panel above the non-display area as much as possible by the out-coupling micro-nano structure.

The present application also includes a terminal device, which includes the display device in any of the above embodiments and a housing, wherein the display device is located in the housing. The terminal device may specifically be a smart terminal device including a display screen, for example, the terminal device may be a smart phone, a tablet computer, a wearable device, a personal computer, or the like.

The following briefly introduces a method for manufacturing an in-coupling micro-nano structure and an out-coupling micro-nano structure (or an optical film) according to an embodiment of the present application with reference to fig. 12 and 13.

1101. Coating ultraviolet curing imprinting glue 903 on a PET or PC film base material 902;

1102. under certain conditions of temperature, pressure and time, the mold 901 is used for pressing the ultraviolet curing imprinting glue 903 on the film substrate 902, so that the ultraviolet curing imprinting glue 903 with the flowing characteristic gradually fills the gap of the mold 901, and ultraviolet irradiation is used for curing the filled ultraviolet curing imprinting glue 903.

The mold 901 has a complementary reverse structure matched with the in-coupling micro-nano structure or the out-coupling micro-nano structure, so that when the mold 901 is used for pressing the ultraviolet curing imprinting adhesive 903, the in-coupling micro-nano structure and the out-coupling micro-nano structure can be formed.

1103. The mold 901 and the cured imprint gel 903 that has cured are separated to form the optical structure 906.

1104. The film substrate 902 is turned over, and steps 1101 to 1103 are repeated to form an optical structure 907 on the other side of the film substrate 902.

Optical structures 907 and 906 can be the in-coupling and out-coupling micro-nano structures described above, respectively.

The in-coupling micro-nano structure, the out-coupling micro-nano structure or the optical film of the embodiment of the application can be obtained through the steps 1101 to 1104. Next, the display device according to the embodiment of the present application can be obtained by the following steps.

1105. The surface of one side of the optical structure 907 is attached to the transparent panel by using OCA glue.

1106. The surface of one side of the optical structure 906 and the display module are attached by using OCA glue.

When step 1105 and step 1106 are performed, the alignment precision should be ensured, so that the optical structure 907 is located above the display area of the display module, and the optical structure 906 is located above the non-display area of the display module, further, the optical structure 906 and the optical structure 907 may be symmetrically arranged about the boundary between the display area and the non-display area.

For the incoupling micro-nano structure in the display device, the incoupling micro-nano structure can be located in the optical film or on the inner surface of the transparent panel, and when the incoupling micro-nano structure is located on the inner surface of the transparent panel, the inner surface of the transparent panel can be processed by adopting a laser photoetching or chemical etching process to obtain the incoupling micro-nano structure. For the out-coupling micro-nano structure, the structure can still be obtained by adopting the above steps 1101 to 1104.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical film, comprising:

the optical film comprises an inner coupling micro-nano structure and an outer coupling micro-nano structure, wherein the inner coupling micro-nano structure and the outer coupling micro-nano structure are embedded in a matrix of the optical film;

the inner coupling micro-nano structure receives incident light from a first area and reflects the incident light to the outer coupling micro-nano structure, and the first area is positioned on one side of the substrate;

the outcoupling micro-nano structure reflects the reflected incident light, the reflected incident light is emitted to a second area, and the second area is positioned on the other side of the substrate;

the in-coupling micro-nano structure comprises a plurality of first micro-nano sub structures, and the minimum distance between every two adjacent first micro-nano sub structures in the plurality of first micro-nano sub structures is larger than or equal to the width of each first micro-nano sub structure in the plurality of first micro-nano sub structures;

each first micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the first micro-nano sub-structure and the bottom surface of the first micro-nano sub-structure is an acute angle, and the reflecting surface of the first micro-nano sub-structure faces the out-coupling micro-nano structure.

2. The optical film of claim 1, wherein a distance between the in-coupling micro-nano structure and the upper surface of the substrate is less than a distance between the in-coupling micro-nano structure and the lower surface of the substrate, and a distance between the out-coupling micro-nano structure and the upper surface of the substrate is greater than a distance between the in-coupling micro-nano structure and the lower surface of the substrate.

3. The optical film of claim 2, wherein an upper surface of the in-coupling micro-nano structure is flush with an upper surface of the substrate, and a lower surface of the out-coupling micro-nano structure is flush with the upper surface of the substrate.

4. The optical film of any of claims 1-3, wherein the thickness of the in-coupling micro-nano structures and the out-coupling micro-nano structures are each less than 1/10 the thickness of the substrate.

5. An optical film according to any one of claims 1 to 3, wherein the reflectance of the reflective surface of the first micro-nano substructure is from 20% to 50%.

6. The optical film according to any one of claims 1-3, wherein the out-coupling micro-nano structure comprises a plurality of second micro-nano substructures, and a maximum distance between any two second micro-nano substructures in the plurality of second micro-nano substructures is less than or equal to a width of any one second micro-nano substructures in the plurality of second micro-nano substructures;

each second micro-nano sub-structure comprises a reflecting surface, the smallest included angle between the reflecting surface of the second micro-nano sub-structure and the bottom surface of the second micro-nano sub-structure is an acute angle, and the reflecting surface of the second micro-nano sub-structure faces the in-coupling micro-nano structure.

7. The optical film of claim 6, wherein the reflectivity of the reflective surface of the second micro-nano substructure is greater than 50%.

8. An optical film as recited in any one of claims 1-3, wherein the optical film further comprises:

the first transparent film is attached to the upper surface of the substrate;

and the second transparent film is attached to the lower surface of the substrate.

9. A display device, comprising: the display device comprises a display module, a transparent panel and an optical film, wherein the optical film is positioned between the display module and the transparent panel, and the display module and the optical film are both positioned on the inner side of the transparent panel;

the display module comprises a display area and a non-display area;

the optical film comprises an inner coupling micro-nano structure and an outer coupling micro-nano structure;

the inner coupling micro-nano structure reflects light rays emitted by the display area to the outer coupling micro-nano structure, the outer coupling micro-nano structure reflects light rays reflected by the inner coupling micro-nano structure to an area, corresponding to the non-display area, in the transparent panel, wherein along a direction perpendicular to the plane of the transparent panel, the area where the projection of the non-display area in the plane of the transparent panel is located is the area, corresponding to the non-display area, in the transparent panel;

10. The display device according to claim 9, wherein the display device further comprises:

a light guide disposed on a side of the display area away from the transparent panel.

11. The display device according to claim 10, wherein a projection of the light guide body in a plane of the display area is located in an edge area adjacent to the non-display area in the display area in a direction perpendicular to the plane of the display area.

12. The display device according to any one of claims 9 to 11, wherein along a direction perpendicular to a plane in which a display area of the display module is located, a projection of the in-coupling micro-nano structure in the plane in which the display area of the display module is located in the display area, and a projection of the out-coupling micro-nano structure in the plane in which the display area of the display module is located in the non-display area.

13. The display device according to any one of claims 9 to 11, wherein the sum of the projection areas of the plurality of first micro-nano substructures in the display area along the thickness direction of the transparent panel is 20% to 50% of the area of the display area.

14. The display device according to any one of claims 9 to 11, wherein an acute included angle formed between the reflection surface of the first micro-nano sub-structure and the plane of the display region is 22.5 degrees to 43.57 degrees.

15. The display device according to any of claims 9-11, wherein the out-coupling micro-nano structure comprises a plurality of second micro-nano sub-structures, and a maximum distance between any two of the plurality of second micro-nano sub-structures is less than or equal to a width of any one of the plurality of second micro-nano sub-structures;

16. The display device according to claim 15, wherein in the thickness direction of the transparent panel, the projection area of the plurality of second micro-nano structures in the non-display area is 50% to 100% of the area of the non-display area.

17. The display device of claim 15, wherein an acute included angle formed between the reflection surface of the second micro-nano structure and the plane of the non-display region is 22.5 degrees to 43.57 degrees.

18. A terminal device, characterized in that it comprises a housing and a display device according to any of claims 9-17, wherein the display device is located inside the housing.