Optical film and display device

Abstract

The present invention provides an optical film and a display device, the optical film includes at least a substrate and a light-enhancing layer, the substrate has a first surface and a second surface relative to each other, and has a central area and an edge area, the edge area is arranged around the central area, the light-enhancing layer is arranged on the first surface, and is configured to converge backlight incident from the second surface, and the light-enhancing layer includes a first microstructure and a second microstructure, wherein the first microstructure is arranged in the central area and has a first concentration, and the second microstructure is arranged in the edge area and has a second concentration, and the first concentration is less than the second concentration. The present invention improves the problem of dark backlight passing through the optical film from the edge area by arranging the second microstructure with a higher concentration than the first microstructure located in the central area of ​​the substrate in the edge area of ​​the substrate, thereby ensuring the uniformity of the backlight brightness passing through the optical film.

Description

Technical Field

[0001] The present invention generally relates to the technical field of display panels, and in particular, to an optical film and a display device. Background Art

[0002] With the continuous development of electronic technology, more and more application scenarios in life require the use of display panels. Based on this, how to ensure the display effect of the display panel is a problem that needs to be solved at present. Summary of the Invention

[0003] In order to solve the above problems or other problems, the present invention provides the following technical solutions.

[0004] In a first aspect, the present invention provides an optical film, the optical film comprising at least:

[0005] a substrate having a first surface and a second surface opposite to each other, and having a central region and an edge region, the edge region being disposed around the central region; and

[0006] a light enhancement layer, disposed on the first surface and configured to converge backlight incident from the second surface, wherein the light enhancement layer comprises a first microstructure and a second microstructure;

[0007] The first microstructure is arranged in the central area and has a first concentration, and the second microstructure is arranged in the edge area and has a second concentration, and the first concentration is smaller than the second concentration.

[0008] According to an optical film according to an embodiment of the present invention, the first microstructure and the second microstructure are made of the same material, wherein:

[0009] The first microstructure has a first side that intersects the first surface at a first angle;

[0010] The second microstructure has a second side that intersects the first surface at a second angle;

[0011] And wherein, the first angle is greater than the second angle.

[0012] According to an optical film according to an embodiment of the present invention, the first microstructure and the second microstructure are made of different materials, wherein:

[0013] The first microstructure has a first side surface that intersects the first surface at a third angle, and the first microstructure has a first refractive index;

[0014] The second microstructure has a second side surface intersecting the first surface at the third angle, and the second microstructure has a second refractive index;

[0015] And wherein the first refractive index is smaller than the second refractive index.

[0016] According to an embodiment of the present invention, the optical film further comprises:

[0017] The diffusion layer is disposed on the second surface and has a plurality of diffusion particles, and the plurality of diffusion particles are only located in the central area.

[0018] According to an embodiment of the present invention, the optical film comprises first and second diffusion particles having the same size and different refractive indices.

[0019] According to an embodiment of the present invention, the optical film comprises the plurality of diffusion particles including first diffusion particles and second diffusion particles having different sizes and the same refractive index.

[0020] According to the optical film of an embodiment of the present invention, the first diffusion particles and the second diffusion particles are randomly arranged on the second surface.

[0021] According to the optical film of an embodiment of the present invention, the first diffusion particles and the second diffusion particles are periodically arranged on the second surface in a first quantity and a second quantity.

[0022] According to the optical film of an embodiment of the present invention, the shapes of the first microstructures and the second microstructures include at least pyramids, and the shapes of the diffusion particles include at least spheres.

[0023] In a second aspect, the present invention provides a display device, the display device comprising at least:

[0024] The optical film as described in any one of the above items; and

[0025] The backlight source is disposed on the second surface and is configured to provide the backlight to the optical film.

[0026] The beneficial effects of the present invention are as follows: the present invention provides an optical film and a display device, the optical film at least comprising a substrate and a light-enhancing layer, the substrate having a first surface and a second surface relative to each other, and having a central area and an edge area, the edge area being arranged around the central area, the light-enhancing layer being arranged on the first surface, and being configured to converge the backlight incident from the second surface, and the light-enhancing layer comprising a first microstructure and a second microstructure, wherein the first microstructure is arranged in the central area and has a first concentration, the second microstructure is arranged in the edge area and has a second concentration, the first concentration is less than the second concentration, the present invention improves the problem of darker backlight passing through the optical film from the edge area by arranging the second microstructure having a higher concentration than the first microstructure located in the central area of ​​the substrate in the edge area of ​​the substrate, thereby ensuring the uniformity of the backlight brightness passing through the optical film. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in describing the various embodiments according to the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 FIG. 1 is a schematic structural diagram of an optical film provided in accordance with a first embodiment of the present invention.

[0029] Figure 2 3 is a further structural schematic diagram of the optical film provided in the first embodiment according to the present invention.

[0030] Figure 3 FIG. 1 is a schematic structural diagram of an optical film provided in accordance with a second embodiment of the present invention.

[0031] Figure 4 FIG. 1 is a schematic structural diagram of an optical film provided in a third embodiment according to the present invention.

[0032] Figure 5 FIG. 1 is a schematic structural diagram of a display device provided in an embodiment according to the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0037] See also Figure 1 , Figure 1 A schematic structural diagram of an optical film 100 according to a first embodiment of the present invention is shown. From the figure, the various components of the first embodiment of the present invention and the relative positional relationship of the various components can be clearly seen.

[0038] like Figure 1As shown, the optical film 100 comprises at least a substrate 110 and a light-enhancing layer 120. Figure 1 , each component in the optical film 100 is described in detail.

[0039] The substrate 110 has a first surface 110 a and a second surface 110 b opposite to each other, and has a central region A and an edge region B. The edge region B is disposed around the central region A. Specifically, an exemplary material of the substrate 110 may include polyethylene terephthalate (PET).

[0040] The light enhancement layer 120 is disposed on the first surface 110a and is configured to converge backlight incident from the second surface 110b, and the light enhancement layer 120 includes a first microstructure 121 and a second microstructure 122, wherein the first microstructure 121 is disposed in the central area A and has a first concentration, and the second microstructure 122 is disposed in the edge area B and has a second concentration, and the first concentration is less than the second concentration.

[0041] Specifically, the first microstructure 121 and the second microstructure 122 in the light enhancement layer 120 are used to change the propagation direction of the above-mentioned backlight, so that the backlight passing through the first microstructure 121 and the second microstructure 122 can propagate along the thickness direction Y of the light enhancement layer 120, thereby improving the brightness of the backlight passing through the optical film 100.

[0042] It should be noted that, in some embodiments, those skilled in the art set microstructures with the same light-concentration in the central area A and the edge area B of the substrate. However, during the application process, there is usually a problem that the backlight passing through the above-mentioned edge area B is darker, which in turn affects the display effect of the backlight passing through the optical film.

[0043] After research by the inventors of this case, it was found that the possibility that the above-mentioned problem was caused by the generally smaller amount and / or intensity of backlight received by the edge area B was ruled out. Furthermore, the inventors found that the cause of the above-mentioned problem was that the incident angle of the backlight incident on the microstructure located in the edge area B was smaller than the incident angle of the backlight incident on the microstructure located in the center area A, resulting in the backlight passing through the edge area B having a propagation direction with the above-mentioned thickness direction Y at a larger angle than the backlight passing through the center area A, thereby causing the above-mentioned problem of the backlight passing through the edge area B being darker.

[0044] Now return to reference Figure 1In an embodiment of the present invention, the inventor of this case arranges a second microstructure 122 with a higher light-concentration degree than the first microstructure 121 located in the central area A of the substrate 110 in the edge area B of the substrate 110. Since the higher light-concentration degree can compensate for the angular difference of the incident angle, the propagation direction of the backlight passing through the central area A and the edge area B can be the same. Specifically, they both propagate along the thickness direction Y. Therefore, the problem of the darker backlight passing through the edge area B is improved, and the display effect of the backlight passing through the optical film 100 is ensured.

[0045] Specifically, the second microstructure 122 of the first microstructure 121 may be in the shape of a pyramid, including but not limited to a triangular pyramid and a quadrangular pyramid.

[0046] For further information, please refer to Figure 1 In this embodiment, the first microstructure 121 and the second microstructure 122 are made of the same material, wherein:

[0047] The first microstructure 121 has a first side surface 121 a intersecting the first surface 110 a at a first angle a1;

[0048] The second microstructure 122 has a second side surface 122 a intersecting the first surface 110 a at a second angle a2;

[0049] And wherein, the first angle a1 is greater than the second angle a2.

[0050] It should be noted that, when the materials of the above-mentioned first microstructure 121 and the second microstructure 122 are the same, the refractive index of the first microstructure 121 and the second microstructure 122 is also the same. Therefore, since the first angle a1 is greater than the second angle a2, the backlight incident from the second surface 110b is deflected to a greater extent after passing through the second microstructure 122. Therefore, the incident angle of the backlight incident to the second microstructure 122 is compensated with a smaller angle, so that the backlight passing through the second microstructure 122 can propagate along the above-mentioned thickness direction Y, thereby improving the problem of the darker backlight passing through the edge area B and ensuring the display effect of the backlight passing through the optical film 100.

[0051] Further, see Figure 2 The further structural diagram of the optical film 100 provided in the first embodiment according to the present invention is shown as follows. Figure 2 As shown, in the embodiment of the present invention, the optical film 100 further includes a diffusion layer 130 , wherein the diffusion layer 130 is disposed on the second surface 110 b and has a plurality of diffusion particles 131 .

[0052] It should be noted that the diffusion layer 130 is used to make the above-mentioned backlight incident on the optical film 100 undergo phenomena such as refraction, reflection and scattering in the film layer through the multiple diffusion particles 131 therein, so that the backlight reaching the substrate 110 and the light-enhancing layer 120 is a more uniform surface light source, thereby achieving the effect of optical diffusion.

[0053] It should be noted that, after further research, the inventors of this case found that due to the existence of the problem of darker backlight passing through the edge area B, the multiple diffusion particles 131 are only located in the above-mentioned central area A, which can increase the incident angle of the backlight incident on the second microstructure 122 located in the edge area B, thereby improving the brightness of the backlight passing through the edge area B, thereby improving the problem of darker backlight passing through the edge area B, and ensuring the display effect of the backlight passing through the optical film 100.

[0054] Specifically, the shape of the plurality of diffusion particles 131 in the diffusion layer 130 may be spherical or any other suitable shape. Furthermore, in this embodiment, the plurality of diffusion particles 131 are made of the same material and have the same refractive index.

[0055] According to the foregoing, a first embodiment of the present invention provides an optical film 100, which includes at least a substrate 110 and a light-enhancing layer 120. The substrate 110 has a first surface 110a and a second surface 110b opposite to each other, and has a central area A and an edge area B. The edge area B is arranged around the central area A. The light-enhancing layer 120 is arranged on the first surface 110a and is configured to converge the backlight incident from the second surface 110b. The light-enhancing layer 120 includes a first microstructure 121 and a second microstructure 122, wherein the first microstructure 121 is arranged in the central area A and has a first concentration, and the second microstructure 122 is arranged in the edge area B and has a second concentration, and the first concentration is less than the second concentration. The present invention improves the problem of dark backlight passing through the edge area B of the optical film 100 by arranging the second microstructure 122 with a higher concentration than the first microstructure 121 located in the central area A of the substrate 110 in the edge area B of the substrate 110, thereby ensuring the uniformity of the backlight brightness passing through the optical film 100.

[0056] See also Figure 3 , Figure 3 The schematic structural diagram of the optical film 200 provided in the second embodiment according to the present invention is shown. From the figure, the various components of the second embodiment according to the present invention and the relative positional relationship of the various components can be clearly seen.

[0057] like Figure 2 and Figure 3As shown, the structure of the second embodiment is substantially the same as that of the first embodiment, wherein the substrate 210 (having a first surface 210a and a second surface 210b), the light enhancement layer 220 (including a first microstructure 221 and a second microstructure 222), and the diffusion layer 230 (including a plurality of diffusion particles 231) in the second embodiment have the same functions and arrangement positions as the substrate 110 (having a first surface 110a and a second surface 110b), the light enhancement layer 120 (including a first microstructure 121 and a second microstructure 122), and the diffusion layer 130 (including a plurality of diffusion particles 131) in the first embodiment.

[0058] The difference lies in that, compared with the first embodiment described above, in this embodiment, the first microstructure 221 and the second microstructure 222 are made of different materials, wherein:

[0059] The first microstructure 221 has a first side surface 221 a intersecting the first surface 210 a at a third angle a3, and the first microstructure 221 has a first refractive index;

[0060] The second microstructure 222 has a second side surface 222a intersecting the first surface 210a at a third angle a3, and the second microstructure 222 has a second refractive index;

[0061] And wherein the first refractive index is smaller than the second refractive index.

[0062] It should be noted that, when the materials of the first microstructure 221 and the second microstructure 222 are different, the refractive indices of the first microstructure 221 and the second microstructure 222 are also different, and the microstructure with a larger refractive index can cause the backlight passing through it to be deflected to a greater extent. Since the second refractive index of the second microstructure 222 is greater than the first refractive index of the first microstructure 221, the incident angle of the backlight incident on the second microstructure 122 is compensated with a smaller angle, so that the backlight passing through the second microstructure 122 can propagate along the thickness direction Y, thereby improving the problem of the darker backlight passing through the edge area B and ensuring the display effect of the backlight passing through the optical film 100.

[0063] See also Figure 4 , Figure 4 A schematic structural diagram of an optical film 300 according to a third embodiment of the present invention is shown. From the figure, the various components of the third embodiment of the present invention and the relative positional relationship of the various components can be clearly seen.

[0064] like Figure 2 and Figure 4As shown, the structure of the third embodiment is substantially the same as that of the first embodiment, wherein the substrate 310 (having a first surface 310a and a second surface 310b), the light enhancement layer 320 (comprising a first microstructure 321 and a second microstructure 322, wherein the first microstructure 321 has a first side surface 321a, and the second microstructure 322 has a second side surface 322a), and the diffusion layer 330 (comprising a plurality of diffusion particles 331) in the third embodiment have the same functions and arrangement positions as the substrate 110 (having a first surface 110a and a second surface 110b), the light enhancement layer 120 (comprising a first microstructure 121 and a second microstructure 122), and the diffusion layer 130 (comprising a plurality of diffusion particles 131) in the first embodiment.

[0065] The difference is that, in this embodiment, the plurality of diffusion particles 331 in the diffusion layer 330 include first diffusion particles 331a and second diffusion particles 331b of different sizes and the same refractive index, and the first diffusion particles 331a and the second diffusion particles 331b are periodically arranged on the second surface 310b with a first number x and a second number y, wherein Figure 4 As shown, illustratively, the first number x and the second number y are both 1.

[0066] It should be noted that such a setting method can make the above-mentioned backlight incident on the optical film 300 undergo greater refraction, reflection and scattering in the diffusion layer 330, so that the backlight reaching the substrate 310 and the light-enhancing layer 320 is a more uniform surface light source, thereby better achieving the optical diffusion effect.

[0067] Furthermore, in other variations of this embodiment, the plurality of diffusion particles 331 in the diffusion layer 330 may include first diffusion particles 331a and second diffusion particles 331b of the same size and different refractive indices, or may include first diffusion particles 331a and second diffusion particles 331b of different sizes and different refractive indices, and the present invention is not limited thereto.

[0068] Furthermore, in other variations of this embodiment, the first diffusion particles 331 a and the second diffusion particles 331 b may also be randomly arranged on the second surface 310 b to further enhance the optical diffusion effect.

[0069] See also Figure 5 , Figure 5 A schematic structural diagram of a display device 500 provided in accordance with an embodiment of the present invention is shown. From the diagram, the various components of the embodiment of the present invention and the relative positional relationships of the various components can be intuitively seen.

[0070] like Figure 5As shown, the display device 500 includes an optical film 510 and a backlight source 520, wherein:

[0071] The optical film 510 may be the optical film 100 described in the first embodiment, the optical film 200 described in the second embodiment, or the optical film 300 described in the third embodiment.

[0072] The backlight source 520 is disposed on the second surface 510 b of the optical film 510 and is configured to provide the aforementioned backlight to the optical film 510 .

[0073] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent replacement falls within the scope of protection required by the present invention.

[0074] In summary, although the preferred embodiments of the present invention have been disclosed above, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. An optical film, characterized in that: The optical film comprises at least: a substrate having a first surface and a second surface opposite to each other, and having a central region and an edge region, the edge region being disposed around the central region; and a light enhancement layer, disposed on the first surface and configured to converge backlight incident from the second surface, wherein the light enhancement layer comprises a first microstructure and a second microstructure; Among them, the first microstructure is arranged in the central area and has a first concentration, the second microstructure is arranged in the edge area and has a second concentration, and the first concentration is less than the second concentration; the optical film also includes a diffusion layer, the diffusion layer is arranged on the second surface, and has a plurality of diffusion particles, and the plurality of diffusion particles are only located in the central area.

2. The optical film according to claim 1, wherein The first microstructure and the second microstructure are made of different materials, wherein: The first microstructure has a first side surface that intersects the first surface at a third angle, and the first microstructure has a first refractive index; The second microstructure has a second side surface intersecting the first surface at the third angle, and the second microstructure has a second refractive index; And wherein the first refractive index is smaller than the second refractive index.

3. The optical film according to claim 1, wherein The plurality of diffusion particles include first diffusion particles and second diffusion particles having the same size and different refractive indices.

4. The optical film according to claim 1, wherein The plurality of diffusion particles include first diffusion particles and second diffusion particles that have different sizes and the same refractive index.

5. The optical film according to any one of claims 3 or 4, characterized in that The first diffusion particles and the second diffusion particles are randomly arranged on the second surface.

6. The optical film according to any one of claims 3 or 4, characterized in that: The first diffusion particles and the second diffusion particles are periodically arranged on the second surface in a first quantity and a second quantity.

7. The optical film according to claim 1, wherein The shapes of the first microstructure and the second microstructure include at least a pyramid, and the shape of the diffusion particles includes at least a sphere.

8. A display device, characterized in that: The display device at least comprises: The optical film according to any one of claims 1 to 7; and The backlight source is disposed on the second surface and is configured to provide the backlight to the optical film.

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