Optical synergistic film and display device

Abstract

The utility model discloses an optical synergistic film and a display device.The optical synergistic film comprises a base material layer and a light guide layer, the light guide layer comprises a body and a plurality of light guide protruding parts, the body is provided with a light inlet face and a light outlet face opposite to the light inlet face, the body is arranged on the base material layer, and the light outlet face faces the base material layer; the light guide protruding parts are arranged on the light inlet face of the body at intervals, any light guide protruding part is provided with an optical side wall facing the other light guide protruding parts, the optical side walls of the adjacent light guide protruding parts and the light inlet face define an air light inlet area, and the cross section of the air light inlet area is enlarged in the direction away from the light inlet face. The included angle between the connecting line of two end points obtained by intersecting the optical side wall and the cross section and the body is defined as theta, theta is larger than or equal to 30 degrees and smaller than or equal to 75 degrees, and the cross section is perpendicular to the light-out face or the light-in face. According to the technical scheme, the visual angle can be effectively increased, meanwhile, the cost advantage is achieved, and the machining difficulty is reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical enhancement film and a display device. Background Art

[0002] With the rapid advancement of technology, the display product market is becoming increasingly prosperous, but it is also facing increasing challenges and opportunities. Consumers' demand for display products has changed from simple image display to the pursuit of higher quality, such as ultra-high-definition resolution, high brightness and wide viewing angle.

[0003] In the prior art, an optical film is provided, which includes: a substrate layer and a light-guiding layer formed on the substrate layer, wherein the light-guiding layer includes: a high-refractive-index resin layer, which includes one or more optical protrusions and a cavity formed between the optical protrusions; and a low-refractive-index resin layer, which is directly formed on the cavity. Although the optical film of the prior art solution is applied to the display device to a certain extent, it can improve the light intensity, contrast and chromaticity difference of the oblique side of the display device, and thus can also expand the visibility of the oblique side of the device to a certain extent. However, the solution includes two layers of resin layers with different refractive indices, and the structural cost is high, and the production and processing are complicated, which limits its wide application in the industry to a certain extent. Utility Model Content

[0004] The embodiments of the present application provide an optical enhancement film and a display device, which can effectively increase the viewing angle while having cost advantages and reducing the difficulty of processing.

[0005] In a first aspect, an embodiment of the present application provides an optical enhancement film, the optical enhancement film comprising:

[0006] a substrate layer; and

[0007] A light guide layer, the light guide layer comprising a body and a plurality of light guide protrusions, the body having a light incident surface and a light emitting surface opposite to the light incident surface, the body being disposed on the substrate layer, and the light emitting surface being disposed toward the substrate layer, a plurality of the light guide protrusions being disposed at intervals on the light incident surface of the body, any of the light guide protrusions having an optical side wall disposed toward other light guide protrusions, the optical side walls of adjacent light guide protrusions and the light incident surface enclosing an air light incident area, the cross section of the air light incident area being arranged to increase in a direction away from the light incident surface;

[0008] The angle between the line connecting two endpoints obtained by the intersection of the optical side wall and the cross section and the main body is defined as θ, 30≤θ≤75°, wherein the cross section is perpendicular to the light emitting surface or the light incident surface.

[0009] In some embodiments, the light-guiding protrusion is arranged in a table shape, and the optical side wall is arranged along the circumference of the light-guiding protrusion;

[0010] Alternatively, the light-guiding protrusion is arranged in a strip-shaped structure, a plurality of the light-guiding protrusions are arranged at intervals along a first direction, the length of the light-guiding protrusion extends along a second direction, the light-guiding protrusion has two optical side walls arranged opposite to each other along the first direction, the length of the optical side wall extends along the second direction, and the first direction and the second direction are arranged vertically.

[0011] In some embodiments, the shape of the optical side wall in the cross section is any one of a straight line, an arc, and a curve.

[0012] In some embodiments, an angle θ between a line connecting two endpoints obtained by the intersection of the optical side wall and the cross section and the main body is 60°.

[0013] In some embodiments, a height of the light-guiding protrusion along the direction from the light-emitting surface to the light-incident surface is H, and H is not less than 0.3 μm and not more than 30 μm.

[0014] In some embodiments, a height of the light-guiding protrusion along the direction from the light-emitting surface to the light-incident surface is H, where H=5 μm.

[0015] In some embodiments, the shape of the light-guiding protrusion in the cross section is trapezoidal, the length of the upper base of the light-guiding protrusion in the cross section is L1, the length of the lower base of the light-guiding protrusion in the cross section is L2, and the distance between two adjacent light-guiding protrusions is L3, satisfying: 0.05≤L2 / (L1+L3)≤0.9.

[0016] In some embodiments, the refractive index of the light guiding layer is N, and 1.3<N<1.7.

[0017] In some embodiments, the refractive index N of the light guiding layer is 1.5.

[0018] In some embodiments, the light-guiding protrusion is disposed in a plane or an arc surface along an end surface away from the body.

[0019] And / or, the plurality of light-guiding protrusions are arranged at equal intervals.

[0020] In a second aspect, an embodiment of the present application provides a display device, including a display module and a cover plate, and also including the above-mentioned optical enhancement film, wherein the light guide layer of the optical enhancement film is connected to the light output side of the display module.

[0021] Based on the optical enhancement film and display device of the present application, an air light entrance area is formed between the light-guiding protrusions of the light-guiding layer, and the air light entrance area is used to fill air so as to form a refractive index difference between the air light entrance area and the light-guiding protrusions. In this way, the light will first pass through the air light entrance area and then through the light-guiding protrusions of the light-guiding layer, where refraction will occur to increase the light effect. Compared with the traditional double-layer resin layer design, the present application omits the setting of the resin layer filled between the light-guiding protrusions, which can simplify the hierarchical structure of the film to reduce the use of light-guiding resin materials, thereby reducing the production cost of the optical enhancement film and reducing the difficulty of processing. At the same time, the thickness and weight of the optical enhancement film are also reduced to be suitable for more application scenarios.

[0022] In addition, the present application further defines that the angle θ between the line connecting the two endpoints obtained by the intersection of the optical side wall and the cross section and the body is between 30° and 75°. In this way, when the light passes through the air light entrance area and irradiates the light guide layer, the light will be refracted by the optical side wall at a larger angle, so that part of the light is refracted to the oblique side, so that the display brightness and contrast of the oblique side of the display device using the optical enhancement film are higher and the chromaticity difference is smaller, so that people located at the oblique side of the display device can see the display content more clearly, thereby improving the user experience of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of an embodiment of a display device of the present application;

[0025] Figure 2 A light diffusion diagram of a light guide layer of the display device of the present application;

[0026] Figure 3 This is a schematic structural diagram of an embodiment of the optical enhancement film of the present application;

[0027] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 This is a light distribution diagram when the display device in the prior art is not provided with an optical enhancement film;

[0029] Figure 6The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 20°;

[0030] Figure 7 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 30°;

[0031] Figure 8 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 40°;

[0032] Fig. 9 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 50°;

[0033] Fig.10 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 60°;

[0034] Fig.11 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 75°;

[0035] Fig.12 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and θ is 80°;

[0036] Fig.13 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 0.2 μm;

[0037] Fig.14 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 0.3 μm;

[0038] Fig.15 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 4 μm;

[0039] Fig.16 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 5 μm;

[0040] Fig.17 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 6 μm;

[0041] Fig.18 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 30 μm;

[0042] Fig.19 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and H is 35 μm;

[0043] Fig. 20The light distribution diagram when the display device of the present application is provided with an optical enhancement film and N is 1.2;

[0044] Fig.21 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and N is 1.3;

[0045] Fig. 22 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and N is 1.44;

[0046] Fig.23 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and N is 1.5;

[0047] Fig.24 The light distribution diagram when the display device of the present application is provided with an optical enhancement film and N is 1.57;

[0048] Fig.25 This is a light distribution diagram when the display device of the present application is provided with an optical enhancement film and N is 1.75.

[0049] Description of Figure Numbers:

[0050] 1000, display device; 100, optical enhancement film; 10, substrate layer; 20, light guide layer; 21, body; 211, light incident surface; 212, light emitting surface; 22, light guide protrusion; 221, optical side wall; 30, air light incident area; 200, display module.

[0051] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the following part will further describe the embodiments of the present application in detail in conjunction with the accompanying drawings.

[0053] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0054] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0056] With the rapid advancement of technology, the display product market is becoming increasingly prosperous, but it is also facing increasing challenges and opportunities. Consumers' demand for display products has changed from simple image display to the pursuit of higher quality, such as ultra-high-definition resolution, high brightness and wide viewing angle.

[0057] In the prior art, an optical film is provided, which includes: a substrate layer and a light-guiding layer formed on the substrate layer, wherein the light-guiding layer includes: a high-refractive-index resin layer, which includes one or more optical protrusions and a cavity formed between the optical protrusions; and a low-refractive-index resin layer, which is directly formed on the cavity. Although the optical film of the prior art solution is applied to the display device to a certain extent, it can improve the light intensity, contrast and chromaticity difference of the oblique side of the display device, and thus can also expand the visibility of the oblique side of the device to a certain extent. However, the solution includes two layers of resin layers with different refractive indices, and the structural cost is high, and the production and processing are complicated, which limits its wide application in the industry to a certain extent.

[0058] To solve the above problems, refer to Figures 1 to 3 In a first aspect, the present application provides an optical enhancement film 100 . The optical enhancement film 100 includes a substrate layer 10 and a light guide layer 20 .

[0059] The substrate layer 10 may be made of one or more transparent materials such as polyethylene glycolterephthalate (PET), polycarbonate (PC), polyetherimide (PEI) and polyether sulfone (PES). Of course, the substrate layer 10 may also be a glass substrate directly. The glass substrate has a uniform material, high transparency and low reflectivity, and good thermal stability, so that the properties can remain stable after multiple high-temperature processes. The glass substrate also has sufficient mechanical strength, precision machining properties and excellent electrical insulation properties.

[0060] The light guide layer 20 can be made of ultraviolet curing glue, such as UV photoresist, which has a fast curing speed and high light transmittance, so that the light guide layer 20 made of ultraviolet curing glue has good light guiding properties. In some embodiments, the light guide layer 20 can also be made of resin materials with other refractive indices.

[0061] The light guide layer 20 includes a body 21 and a plurality of light guide protrusions 22. The body 21 has a light incident surface 211 and a light emitting surface 212 opposite to the light incident surface 211. The body is disposed on the substrate layer 10, and the light emitting surface 212 is disposed toward the substrate layer 10. The plurality of light guide protrusions 22 are disposed at intervals on the light incident surface 211 of the body 21. Specifically, a plurality of light guide protrusions 22 arranged at intervals can be formed by mold processing. Any light guide protrusion 22 has an optical side wall 221 disposed toward other light guide protrusions. The optical side walls 221 of adjacent light guide protrusions 22 and the body 21 enclose an air light incident area 30. The cross section of the air light incident area 30 is arranged to increase in a direction away from the body 21.

[0062] Combined with reference Figure 4 , the angle between the line connecting the two endpoints of the optical side wall 221 and the cross section and the body 21 is defined as θ. Wherein, the cross section is perpendicular to the light emitting surface or the light incident surface. The light distribution diagram of the display device in the prior art when no optical enhancement film is provided is as follows: Figure 5As shown. Among them, the ordinate is the brightness value, the abscissa represents the viewing angle, and the center point of the abscissa represents the angle of the human eye looking directly at the display device in the horizontal direction. When the abscissa extends to both ends, it means that the angle of the human eye looking at the display device in the horizontal direction gradually increases until it reaches ninety degrees. In the chart, the blue line depicts the brightness change in the horizontal direction. Specifically, as the angle of the human eye looking at the display device in the horizontal direction continues to increase, the brightness of the viewed display device will gradually decrease. It should be pointed out here that when the brightness drops to one-third of the maximum brightness, this brightness level is considered to be the lowest brightness visible to the human eye. Therefore, when the brightness drops to one-third of the maximum brightness, the corresponding abscissa position is the limit value of the viewing angle in the horizontal direction. That is, the horizontal visible range when the display device is not provided with an optical enhancement film is L0.

[0063] When the display device 1000 is provided with the optical enhancement film 100, and other conditions of the light guide layer 20 remain the same and only the value of the angle θ is changed, the light distribution diagram is shown in FIG. 1 when the angle θ is 20°, 30°, 40°, 50°, 60°, 70°, and 80° respectively. Figures 6 to 12 As shown, L1 is the viewing angle after the display device 1000 is provided with the optical enhancement film 100. Therefore, it can be seen that after the light guide layer 20 is provided and the value of the angle θ is adjusted, when the angle of viewing the display device in the horizontal direction of the human eye changes, the curve of the brightness change in the horizontal direction fluctuates, so that the horizontal coordinate position corresponding to 1 / 3 is offset outward, that is, the limit value of the viewing angle increases to improve the viewing angle. When θ is less than 30 degrees, the curve fluctuation is not obvious, and the viewing angle increases slightly. When θ is greater than 75 degrees, the position where the fluctuation occurs is less than 1 / 3 of the maximum brightness, resulting in a smaller viewing angle. In this way, the value of the angle θ can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° or 75°, etc., and the value can be within 30°≤θ≤75°. Further, when θ=60°, the brightness drops to 1 / 3 of the maximum brightness, and the corresponding viewing angle is the largest. Therefore, the angle θ between the line connecting the two endpoints obtained by the intersection of the optical side wall and the cross section and the main body is 60°. The optical enhancement film 100 can greatly improve the relative brightness and contrast of the oblique side (the contrast refers to the ratio of the brightness of the same point on the display screen when it is brightest to the darkest). By enhancing the brightness and contrast performance of the oblique side, the viewing angle is expanded, thereby eliminating color deviation, and increasing the display frequency domain, thereby improving the difference between the front contrast ratio and the side contrast ratio.

[0064] In this way, an air light entry area 30 is formed between the light-guiding protrusions 22 of the light-guiding layer 20, and the air light entry area 30 is used to fill air so that a refractive index difference is formed between the air light entry area 30 and the light-guiding protrusions 22. In this way, light will first pass through the air light entry area 30 and then through the light-guiding protrusions 22 of the light-guiding layer 20, and refraction will occur to increase the light effect. Compared with the traditional double-layer resin layer design, the present application omits the setting of the resin layer filled between the light-guiding protrusions 22, which can simplify the hierarchical structure of the film to reduce the use of light-guiding resin materials, thereby reducing the production cost of the optical enhancement film 100 and reducing the difficulty of processing. At the same time, the thickness and weight of the optical enhancement film 100 are also reduced to be suitable for more application scenarios.

[0065] In addition, the present application further defines that the angle θ between the line connecting the two endpoints obtained by the intersection of the optical side wall and the cross section and the body is between 30° and 75°. In this way, when the light passes through the air light entrance area and irradiates the light guide layer 20, the light will be refracted by the optical side wall 221 at a larger angle, so that part of the light is refracted to the oblique side, so that the display brightness and contrast of the oblique side of the display device 1000 using the optical enhancement film 100 are higher and the chromaticity difference is smaller, so that people located at the oblique side of the display device 1000 can view the display content more clearly, thereby improving the user experience of the display device 1000.

[0066] In one embodiment, the light-guiding protrusion 22 is arranged in a table, and the optical side wall 221 is arranged along the circumference of the light-guiding protrusion 22. In this way, the optical side wall 221 is arranged along the circumference of the light-guiding protrusion 22 to form an all-round optical refractive surface. This layout enables light to be effectively refracted and diffused in multiple directions, greatly broadening the breadth of the viewing angle. Specifically, when the display device 1000 is in a vertical state, the circumferentially arranged optical side wall 221 can simultaneously increase the side viewing breadth of the left and right viewing angles and the upper and lower viewing angles. This means that no matter from which angle the user views the display device 1000, a clear and bright visual experience can be obtained. This design not only meets the user's needs for viewing in a fixed position, but also greatly improves the applicability of the display device 1000 in scenarios where multiple people share and view from multiple angles. It should be noted that the shape of the table can be flexibly selected according to actual needs, such as a frustum, a truncated cone, a prism, etc., which can achieve a multi-directional light refraction effect.

[0067] In another embodiment, the light-guiding protrusion 22 is arranged in a strip-shaped structure, a plurality of light-guiding protrusions 22 are arranged at intervals along the first direction, the length of the light-guiding protrusion 22 extends along the second direction, the light-guiding protrusion 22 has two optical side walls 221 arranged opposite to each other along the first direction, the length of the optical side walls 221 extends along the second direction, and the first direction and the second direction are arranged vertically. In this way, the above arrangement can not only satisfy the function of refracting light, but also the light-guiding protrusion 22 with a strip-shaped structure is simpler and more intuitive in processing, which can greatly improve the processing efficiency and accuracy, and make the structure of each light-guiding protrusion 22 more stable.

[0068] Reference Figures 2 to 4 In some structural forms, the cross-sectional shape of the optical side wall 221 is any one of a straight line, an arc, and a curve. This diversity enables the light-guiding protrusion 22 to be customized according to different usage scenarios and requirements, thereby achieving the best display effect. In the embodiment in which the light-guiding protrusion 22 is arranged as a table, the circumferential optical side wall 221 can be designed into a shape such as a curved surface or a plane. When a curved surface is selected, the refraction of light on the side wall will be more uniform, which helps to widen the viewing angle and reduce glare. When a plane is selected, more direct and efficient light propagation can be achieved, which is suitable for scenes requiring high brightness or high contrast. Regardless of which shape is selected, the cross-sectional shape of the optical side wall 221 in the convex direction is a straight line. In the embodiment in which the light-guiding protrusion 22 is arranged in a strip structure, the shape and cross-sectional setting of the optical side wall 221 show more possibilities. When the optical side wall 221 is arranged in a plane, its cross-sectional shape is a straight line. This design is simple and direct, and is suitable for scenes that do not require high display effects. When the optical side wall 221 is a concave curved surface or a convex curved surface, its cross-sectional shape corresponds to an arc setting. This design can cause more complex refraction and diffusion of light on the side wall, thereby widening the viewing angle and enhancing the visual effect. When the optical side wall 221 is designed as a curved surface, its cross-sectional shape corresponds to a curve setting. This curved surface design can bring a softer and more natural light transition effect, making the display effect more comfortable and realistic. At the same time, the curved surface design can also effectively reduce light loss and glare, and enhance the user's viewing experience.

[0069] Reference Figure 4 In some embodiments of the present application, the height of the light-guiding protrusion 22 along the direction from the light-emitting surface 212 to the light-incident surface 211 is H. When the display device 1000 is provided with the optical enhancement film 100, and other conditions of the light-guiding layer 20 remain the same and only the value of the height H is changed, the distribution diagram is as follows when H is 0.2 μm, 0.3 μm, 4 μm, 5 μm, 6 μm, 30 μm, and 35 μm: Figures 13 to 19 As shown, L1 is the viewing angle of the display device 1000 after the optical enhancement film 100 is installed. Figure 5It can be seen that after setting the light guide layer 20 and adjusting the value of the height H, when the angle of viewing the display device in the horizontal direction of the human eye changes, the curve of the brightness change in the horizontal direction fluctuates, so that the horizontal coordinate position corresponding to 1 / 3 is offset outward, that is, the limit value of the visible angle increases to improve the viewing angle. When H is less than 0.3μm, the position where the fluctuation occurs is less than 1 / 3 of the highest brightness, resulting in a smaller viewing angle, and when H is greater than 30μm, it will cause the brightness of the front view to be too low, so H can be 0μm, 11μm, 13μm, 14μm, 15μm, etc., and the value can be within 0.3μm≤H≤30μm. Within this range, the optical side wall 221 of the light guide protrusion 22 has a larger refractive surface to increase the light effect. Further, when H=5μm, the brightness is reduced to 1 / 3 of the highest brightness, and the corresponding viewing angle is the largest. And the light guide protrusion 22 has a smoother transition here, a larger viewing angle range, and a better display effect.

[0070] Reference Figure 4 In some structural forms, the cross-section of the light-guiding protrusion 22 is trapezoidal, the length of the upper bottom side of the cross-section of the light-guiding protrusion 22 is L1, the length of the lower bottom side of the cross-section of the light-guiding protrusion 22 is L2, and the spacing between two adjacent light-guiding protrusions 22 is L3, which satisfies: 0.05≤L2 / (L1+L3)≤0.9. Specifically, when L2 / (L1+L3) is small, the bottom end of the light-guiding protrusion 22 is relatively narrow, so that more light can pass through the air light-entry area 30 to irradiate the optical side wall, and when L2 / (L1+L3) is large, the bottom end is relatively wide, so that when the optical enhancement film 100 is installed on the display module 200 of the display device 1000, the contact area between the light-guiding protrusion 22 and the display module 200 of the display device 1000 can be increased to ensure installation stability. The above-mentioned proportional relationship is set to ensure that the design of the light-guiding protrusion 22 can effectively guide and scatter light, so that the light can obtain the best refraction and scattering effect when passing through the light-guiding protrusion 22, while ensuring the installation stability of the light-guiding layer 20 and the display module 200 of the display device 1000.

[0071] Optionally, the refractive index of the light guide layer 20 is N, 1.3<N<1.7. The higher or lower the refractive index of the light guide layer 20 material is, the more expensive it is. The refractive index N of the light guide layer 200 of this embodiment is within the range of 1.3≤N≤1.7. The refractive index of the light guide layer 20 meets the refractive requirements while also controlling the production cost of the optical enhancement film 100.

[0072] When the display device 1000 is provided with the optical enhancement film 100, and other conditions of the light guide layer 20 remain the same and only the refractive index of the light guide layer 20 is changed, the corresponding brightness relationship when the refractive index is 1.2, 1.3, 1.44, 1.5, 1.57, and 1.75 respectively is as follows: Figure 20 to Figure 25 As shown, L1 is the viewing angle of the display device 1000 after the optical enhancement film 100 is installed. Figure 5 It can be seen that after the light guide layer 20 is set and the refractive index of the light guide layer 20 is adjusted, when the angle of the display device viewed in the horizontal direction of the human eye changes, fluctuations appear on the curve of the brightness change in the horizontal direction, so that the horizontal coordinate position corresponding to 1 / 3 is offset outward, that is, the limit value of the visible angle is increased to improve the viewing angle. When the refractive index is less than 1.3, the curve fluctuation is not obvious, and the visible angle increases slightly. When the refractive index is greater than 1.7, it will cause the overall cost to be too high. Therefore, the refractive index N value of the light guide layer 200 can be in the range of 1.3≤N≤1.7. Furthermore, when N=1.5, the brightness drops to 1 / 3 of the maximum brightness, and the corresponding visible angle is the largest. Therefore, the refractive index N value of the light guide layer 20 can be preferably 1.5.

[0073] In one embodiment, the end face of the light-guiding protrusion 22 away from the body 21 is arranged in a plane. This helps to simplify the processing process and improve efficiency. By designing the back of the light-guiding protrusion 22 as a plane, the manufacturing process can be carried out more easily. The plane setting makes the processing process more intuitive and simple, reduces the processing requirements for complex curved surfaces, and reduces production costs and processing difficulties. Such design choices help to speed up the production process and improve production efficiency. In addition, the flat back design can also improve the accuracy and consistency of processing. Compared with the curved surface, the plane is easier to achieve processing accuracy and consistency, thereby ensuring the quality and performance stability of the light-guiding protrusion 22. In another embodiment, the end face of the light-guiding protrusion 22 away from the body 21 is arranged in an arc surface, and designing the back of the light-guiding protrusion 22 as an arc surface can effectively improve the transmission and scattering characteristics of light. The arc surface design can make the light more evenly distributed and scattered when passing through the light-guiding layer 20, thereby improving the uniformity and brightness of the optical effect. In addition, the arc surface can also reduce the reflection and refraction of light, reduce optical loss, and improve the transmission efficiency of light.

[0074] Optionally, multiple light-guiding protrusions 22 are arranged at equal distances. Arranging multiple light-guiding protrusions 22 at equal distances can effectively increase the propagation path and scattering points of the light, thereby improving the coverage and uniformity of the light. By properly adjusting the spacing and arrangement of the light-guiding protrusions 22, the light can be evenly distributed throughout the light-guiding layer 20, thereby improving the consistency and stability of the optical effect.

[0075] Reference Figure 1 and Figure 2In a second aspect of the present application, a display device 1000 is proposed. The display device 1000 may be an active light-emitting display device, such as an organic light-emitting diode (OLED) display device, an active matrix organic light-emitting diode (AMOLED) display device, a passive matrix organic light-emitting diode (PMOLED) display device, a quantum dot organic light-emitting diode (QLED) display device, a micro light-emitting diode (Micro-LED) display device, and a sub-millimeter light-emitting diode (Mini light-emitting diode, Mini-LED) display device. It may also be a passive light-emitting display device, such as a liquid crystal display (LCD) device, which is not specifically limited here.

[0076] The display device 1000 includes a display module 200 and the above-mentioned optical enhancement film 100. The optical enhancement film 100 is attached to the light-emitting side of the display module 200, so that the light of the display module 200 will be emitted after passing through the optical enhancement film 100. The specific structure of the optical enhancement film 100 refers to the above-mentioned embodiment. Since the display device 1000 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The display module 200 is a liquid crystal panel, and the liquid crystal panel has good display quality.

[0077] Furthermore, the light guide layer 20 is arranged with the side facing away from the substrate layer 10 toward the light output side of the display module 200. The spacing distance between the light guide layer 20 and the liquid crystal display module 200 is greater than or equal to 0 mm and less than or equal to 5 mm. Among them, too small a spacing distance may cause optical interference or other problems affecting the display effect, while too large a spacing distance may increase the path length of light transmission and reduce the brightness and clarity of the display effect. The spacing distance between the light guide layer 20 and the display module 200 is greater than or equal to 0 mm and less than or equal to 5 mm to ensure the effective transmission of light between the two and minimize optical losses. This appropriate spacing distance can effectively control the incident angle and direction of light, thereby optimizing the uniformity of the display effect and the viewing experience.

[0078] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application 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. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An optical enhancement film, characterized in that: include: substrate layer; and A light guide layer, the light guide layer comprising a body and a plurality of light guide protrusions, the body having a light incident surface and a light emitting surface opposite to the light incident surface, the body being disposed on the substrate layer, and the light emitting surface being disposed toward the substrate layer, a plurality of the light guide protrusions being disposed at intervals on the light incident surface of the body, any of the light guide protrusions having an optical side wall disposed toward other light guide protrusions, the optical side walls of adjacent light guide protrusions and the light incident surface enclosing an air light incident area, the cross section of the air light incident area being arranged to increase in a direction away from the light incident surface; The angle between the line connecting two endpoints obtained by the intersection of the optical side wall and the cross section and the main body is defined as θ, 30≤θ≤75°, wherein the cross section is perpendicular to the light emitting surface or the light incident surface.

2. The optical enhancement film according to claim 1, characterized in that: The light-guiding protrusion is arranged in a table shape, and the optical side wall is arranged along the circumference of the light-guiding protrusion; Alternatively, the light-guiding protrusion is arranged in a strip-shaped structure, a plurality of the light-guiding protrusions are arranged at intervals along a first direction, the length of the light-guiding protrusion extends along a second direction, the light-guiding protrusion has two optical side walls arranged opposite to each other along the first direction, the length of the optical side wall extends along the second direction, and the first direction and the second direction are arranged vertically.

3. The optical enhancement film according to claim 1, characterized in that: The shape of the optical side wall in the cross section is any one of a straight line, an arc, and a curve.

4. The optical enhancement film according to claim 1, characterized in that: An included angle θ between a line connecting two endpoints obtained by the intersection of the optical side wall and the cross section and the main body is 60°.

5. The optical enhancement film according to claim 1, characterized in that: A height of the light-guiding protrusion along a direction from the light-emitting surface to the light-incident surface is H, and H is not less than 0.3 μm and not more than 30 μm.

6. The optical enhancement film according to claim 5, characterized in that: The height of the light-guiding protrusion along the direction from the light-emitting surface to the light-incident surface is H, where H=5 μm.

7. The optical enhancement film according to claim 1, characterized in that: The shape of the light-guiding protrusion in the cross section is trapezoidal, the length of the upper base of the light-guiding protrusion in the cross section is L1, the length of the lower base of the light-guiding protrusion in the cross section is L2, and the distance between two adjacent light-guiding protrusions is L3, satisfying: 0.05≤L2 / (L1+L3)≤0.

9.

8. The optical enhancement film according to claim 1, characterized in that: The refractive index of the light guiding layer is N, and 1.3<N<1.

7.

9. The optical enhancement film according to claim 7, characterized in that: The refractive index N of the light guiding layer is 1.

5.

10. The optical enhancement film according to any one of claims 1 to 9, characterized in that: The end surface of the light-guiding protrusion away from the body is arranged in a plane or an arc surface; And / or, the plurality of light-guiding protrusions are arranged at equal intervals.

11. A display device, comprising a display module, characterized in that: It also includes the optical enhancement film according to any one of claims 1 to 10, wherein the light guide layer of the optical enhancement film is connected to the light output side of the display module.

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