An optical privacy structure, display module and display device

Abstract

This invention relates to the field of display technology, specifically to an optical privacy screen structure, a display module, and a display device. The optical privacy screen structure of this invention includes a transparent substrate and a first optical film layer. This invention provides a first protrusion or a first recess on one or both sides of the transparent substrate, and cooperates with a high-refractive-index first optical film layer, causing the display light to converge towards the viewing angle of the light source, thus achieving privacy protection at a certain angle. Furthermore, this invention achieves privacy protection by changing the light emission angle; the actual emitted light does not suffer significant loss due to privacy protection, resulting in high light source utilization. Compared to current privacy protection solutions using micro-grating structures and dimming liquid crystal structures, it has higher light transmittance and does not lead to increased backlight power consumption.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to an optical privacy shield structure, a display module, and a display device. Background Technology

[0002] Today, society has an increasing demand for display products, with higher requirements and a growing awareness of user privacy. Users are paying more attention to the privacy of viewing display products, leading to a widespread need for privacy protection. Existing optical privacy protection structures mainly come in two forms: micro-grating structures and dimming liquid crystal structures. Micro-grating structures are primarily used for left and right privacy protection, but have very low light transmittance. Dimming liquid crystal structures block backlight light, resulting in high backlight power consumption. Summary of the Invention

[0003] In view of this, the present invention provides an optical privacy structure, a display module and a display device, which aims to adjust the position of the normal line on the surface of the transparent substrate and match the refractive index of each film layer to correct the direction of the light emitted from a wide viewing angle, thereby controlling the privacy angle and achieving the purpose of optical privacy.

[0004] In a first aspect, the present invention provides an optical privacy structure, comprising a transparent substrate and a first optical film layer;

[0005] The transparent substrate has a plurality of first protrusions on one side, with two adjacent first protrusions connected together; the cross-sectional shape of the first protrusion is triangular along a direction perpendicular to the plane of the transparent substrate, with the vertex of the triangle located at the top of the first protrusion; the first optical film layer is located on the side of the transparent substrate where the first protrusions are provided, and is in contact with the transparent substrate;

[0006] Alternatively, a plurality of first recesses are provided on one side of the transparent substrate, with two adjacent first recesses connected together; along a direction perpendicular to the plane of the transparent substrate, the cross-sectional shape of the first recess is triangular, with the vertex of the triangle located at the bottom of the first recess; the first optical film layer is located on the side of the transparent substrate where the first recesses are provided, and is in contact with the transparent substrate;

[0007] The refractive index of the transparent substrate is ng, and the refractive index of the first optical film layer is n1, where ng < n1.

[0008] Secondly, based on the same inventive concept, the present invention provides a display module, including a display panel and the aforementioned optical privacy structure, wherein the optical privacy structure is located on the light-emitting side of the display panel.

[0009] Thirdly, based on the same inventive concept, the present invention provides a display device including the above-described display module.

[0010] Compared with related technologies, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0011] This invention provides a first protrusion or a first recess on one or both sides of a transparent substrate, coupled with a first optical film layer with a high refractive index, to direct the display light towards the viewing angle of the light source, thus achieving privacy protection at a certain angle. Furthermore, this invention achieves privacy protection by changing the light emission angle; the actual emitted light does not suffer significant loss due to privacy protection, resulting in high light source utilization. Compared to current privacy protection solutions using micro-grating structures and dimming liquid crystal structures, it offers higher light transmittance and does not increase backlight power consumption.

[0012] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0013] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0014] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0015] Figure 1 The diagram shown is a schematic diagram of an optical privacy structure provided by the present invention;

[0016] Figure 2 The diagram shown is another structural schematic of an optical privacy structure provided by the present invention;

[0017] Figure 3 The diagram shows the light path when light is incident on the first protrusion or the first concave portion of a transparent substrate in one scenario.

[0018] Figure 4 The diagram shows the light path when light is incident on the first protrusion or the first recess of the transparent substrate in another scenario.

[0019] Figure 5 The diagram shown is another structural schematic of the optical privacy screen provided by the present invention;

[0020] Figure 6 The diagram shown is another structural schematic of the optical privacy screen provided by the present invention;

[0021] Figure 7 The diagram shown is another structural schematic of the optical privacy screen provided by the present invention;

[0022] Figure 8 The diagram shown is another structural schematic of an optical privacy screen structure provided by the present invention.

[0023] Figure 9 The diagram shown is a schematic of the optical privacy structure of the present invention.

[0024] Figure 10 The diagram shown is a schematic diagram of an optical privacy structure provided in an embodiment of the present invention;

[0025] Figure 11 This is a partial enlarged view of one side surface of the transparent substrate provided in an embodiment of the present invention;

[0026] Figure 12 The diagram shown is a schematic representation of an optical privacy screen structure provided in an embodiment of the present invention.

[0027] Figure 13 This is a schematic diagram of the structure of a display module provided in an embodiment of the present invention;

[0028] Figure 14 The diagram shown is a structural schematic of a display device provided in an embodiment of the present invention. Detailed Implementation

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0030] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0031] Various modifications and variations can be made to this invention without departing from its spirit or scope, as will be apparent to those skilled in the art. Therefore, this invention is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this invention can be combined with each other without contradiction.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0033] This invention provides an optical privacy screen structure, including a transparent substrate and a first optical film layer; a plurality of first protrusions are provided on one side of the transparent substrate, and two adjacent first protrusions are connected; along the direction perpendicular to the plane of the transparent substrate, the cross-sectional shape of the first protrusion is triangular, and the vertex of the triangle is located at the top of the first protrusion; the first optical film layer is located on the side of the transparent substrate where the first protrusions are provided and is in contact with the transparent substrate; or, a plurality of first recesses are provided on one side of the transparent substrate, and two adjacent first recesses are connected; along the direction perpendicular to the plane of the transparent substrate, the cross-sectional shape of the first recess is triangular, and the vertex of the triangle is located at the bottom of the first recess; the first optical film layer is located on the side of the transparent substrate where the first protrusions or first recesses are provided and is in contact with the transparent substrate; the refractive index of the transparent substrate is ng, and the refractive index of the first optical film layer is n1, where ng < n1. This invention provides a first protrusion or a first recess on one side of a transparent substrate, and a first optical film layer with a relatively high refractive index on the same side. The first protrusions are interconnected, and the first recesses are interconnected. The cross-sectional shape of the first recess is triangular along a direction perpendicular to the plane of the transparent substrate. Thus, light incident on the transparent substrate will first pass through the high-refractive-index first optical film layer, causing the incident angle of the light incident on the first protrusion or first recess of the transparent substrate to decrease relative to the vertical direction. Furthermore, since the cross-sectional shape of the first protrusion or first recess is triangular, and the first protrusions and first recesses are interconnected, the actual irradiation position of the light is an inclined plane with a certain angle θ relative to the plane of the transparent substrate. Therefore, when the light reaches the first protrusion or first recess, the difference in refractive index causes the light to be deflected. Simultaneously, due to the existence of the angle θ, this difference can reduce the angle between the light emitted from the optical privacy structure and the air surface, thus achieving a privacy protection function.

[0034] The above is the core idea of ​​this invention. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the embodiments of this invention.

[0035] Figure 1 The diagram shown is a schematic diagram of an optical privacy structure provided by the present invention. Figure 2 The diagram shown is another structural schematic of an optical privacy structure provided by the present invention. Please refer to it. Figure 1 and Figure 2The optical privacy screen structure of the present invention includes a transparent substrate 1 and a first optical film layer 2; a plurality of first protrusions 11 are provided on one side of the transparent substrate 1, and two adjacent first protrusions 11 are connected; along the direction perpendicular to the plane of the transparent substrate 1, the cross-sectional shape of the first protrusion 11 is triangular, and the vertex of the triangle is located at the top of the first protrusion 11; the first optical film layer 2 is located on the side of the transparent substrate 1 where the first protrusions 11 are provided, and is in contact with the transparent substrate 1; or, a plurality of first recesses 12 are provided on one side of the transparent substrate 1, and two adjacent first recesses 12 are connected; along the direction perpendicular to the plane of the transparent substrate 1, the cross-sectional shape of the first recess 12 is triangular, and the vertex of the triangle is located at the bottom of the first recess 12; the first optical film layer 2 is located on the side of the transparent substrate 1 where the first recesses 12 are provided, and is in contact with the transparent substrate 1; the refractive index of the transparent substrate 1 is ng, the refractive index of the first optical film layer 2 is n1, and ng < n1.

[0036] Specifically, the optical privacy structure of the present invention includes a transparent substrate 1 and an optical film layer 2, wherein the first optical film layer 2 is a high-refractive-index optical film layer with a refractive index n1 greater than the refractive index ng of the transparent substrate 1, and the function of the first optical film layer 2 is to converge light.

[0037] The transparent substrate 1 of the present invention has a first protrusion 11 or a first recess 12 on the side near the optical film layer 2. The function of the first protrusion 11 or the first recess 12 is to change the normal direction of the surface of the transparent substrate.

[0038] Figure 3 The diagram shown illustrates the optical path of light incident on the first protrusion 11 or the first recess 12 of the transparent substrate 1 in one scenario. Figure 4 The diagram shows the light path when light is incident on the first protrusion 11 or the first recess 12 of the transparent substrate 1 in another scenario. The light incident on the first protrusion 11 or the first recess 12 can be categorized into three cases: one case is incident along the normal direction, in which case the refracted light is also along the normal direction; another case is as follows... Figure 3 As shown, if the incident ray a1 is located on the first side of the normal L1, then the refracted ray b1 will move towards the direction of the viewing angle of the light source; the third case is as follows. Figure 4 As shown, if the incident ray a2 is located on the second side of the normal L2, then the refracted ray b2 will deviate further from the direction of the light source's viewing angle.

[0039] To achieve privacy protection, it is desirable for the refracted light rays passing through the interface of the first protrusion 11 or the first recess 12 to converge toward the direction of the light source's viewing angle. To this end, a first optical film layer 2 is also provided on the side of the transparent substrate 1 where the first protrusion 11 or the first recess 12 is provided. The refractive index of the first optical film layer 2 is greater than that of the transparent substrate 1. Therefore, the incident light rays will converge after passing through the first optical film layer 2, which will make the angle between the incident light rays and the vertical direction smaller. As a result, the incident light rays are more likely to be located on the first side of the normal, which is more conducive to achieving privacy protection.

[0040] Furthermore, in a third scenario, since adjacent first protrusions 11 or first recesses 12 are connected, the surface of the transparent substrate 1 is composed of bevels, such as... Figure 4 As shown, some large-angle light rays will be reflected or refracted on the surface of the adjacent first protrusion 11 or on the opposite side of the first concave portion 12, and the light rays d2 emitted again will move towards the direction of the light source's viewing angle.

[0041] Therefore, the present invention provides a first protrusion 11 or a first recess 12 on one side of the transparent substrate 1, and cooperates with a first optical film layer 2 to bring the display light closer to the viewing angle of the light source, thereby achieving privacy protection at a certain angle. In addition, the present invention achieves privacy protection by changing the emission angle of the light, and the actual emitted light does not suffer significant loss due to privacy protection, resulting in high light source utilization.

[0042] It should be noted that the optical privacy structure of the present invention uses an inclined plane to correct the direction of light propagation. Therefore, regardless of whether the side of the transparent substrate 1 closest to the first optical film layer 2 has a first protrusion 11 or a first recess 12, two adjacent first protrusions 11 or two adjacent first recesses 12 must be connected at a certain angle; that is, there is no plane between two adjacent first protrusions 11; there is no plane between two adjacent first recesses 12. A plane refers to a plane parallel to the plane where the optical privacy structure is located.

[0043] Figure 5 The diagram shown is another structural schematic of the optical privacy screen provided by the present invention; Figure 6 The diagram shown is another structural schematic of the optical privacy screen provided by the present invention; Figure 7 The diagram shown is another structural schematic of the optical privacy screen provided by the present invention; Figure 8 The diagram shown is another structural schematic of an optical privacy screen provided by the present invention; please refer to it. Figures 5 to 8The transparent substrate 1 of the present invention is provided with a plurality of second protrusions 13 on the side away from the first optical film layer 2. Two adjacent second protrusions 13 are connected together. The cross-sectional shape of the second protrusion 13 is triangular along the direction perpendicular to the plane of the transparent substrate 1, and the vertex of the triangle is located at the bottom of the second protrusion. Alternatively, the transparent substrate 1 is provided with a plurality of second recesses 14 on the side away from the first optical film layer 2. Two adjacent second recesses 14 are connected together. The cross-sectional shape of the second recesses 14 is triangular along the direction perpendicular to the plane of the transparent substrate 1, and the vertex of the triangle is located at the bottom of the second recesses 14.

[0044] Specifically, to further improve the privacy protection effect, the present invention provides a second protrusion 13 or a second recess 14 on the other side of the transparent substrate 1. Thus, the transparent substrate 1 has four basic structures. Figure 5 In the optical privacy structure shown, the transparent substrate 1 has a first protrusion 11 on its light-incident side and a second protrusion 13 on its light-out side. Figure 6 In the optical privacy structure shown, the transparent substrate 1 has a first protrusion 11 on its light-incident side and a second recess 14 on its light-outceasing side. Figure 7 In the optical privacy structure shown, the transparent substrate 1 has a first recess 12 on its light-incident side and a second recess 14 on its light-out side. Figure 8 In the optical privacy structure shown, the transparent substrate 1 has a first recess 12 on its light-incident side and a second protrusion 13 on its light-out side.

[0045] In conclusion, Figures 5 to 8 The optical privacy structure shown can form inclined surfaces on the light-emitting side and the light-receiving side of the transparent substrate 1. The inclined surfaces have an angle with the plane where the optical privacy structure is located. This angle can be used to adjust the emission direction of the display light, so that the display light is closer to the viewing angle of the light source, thus playing a role in privacy protection.

[0046] Figure 9 The schematic diagram of the optical privacy structure of the present invention shown is for reference only. Figure 9 The light emitted from point A can be roughly divided into three categories: the first category, ray I, is a large-angle ray; the second category, ray II, is perpendicular to the plane where the optical privacy structure is located; and the third category, ray III, is a small-angle ray.

[0047] In practical applications of this invention, the optical privacy structure can be disposed on the light-emitting side of the display panel via optical adhesive 10; therefore, light emitted from point A will pass sequentially through optical adhesive 10, the first optical film layer 2, and the transparent substrate 1 before being emitted. The refractive index of optical adhesive 10 is similar to the refractive index nx of the film layer between the light source and optical adhesive 10, and is less than the refractive index ng of the transparent substrate 1, thus belonging to a low refractive index material. Figure 9No. 4 is the second optical film layer, No. 5 is the third optical film layer, and No. 6 is the fourth optical film layer. The second, third, and fourth optical film layers will be described in detail below. θ6 and θ7 are the incident angles of the first type of ray I and the third type of ray III irradiating the optical adhesive 10, respectively. θ6 is the refraction angle of the first type of ray I in the optical adhesive 10. θ4 is the refraction angle of the first type of ray I in the first optical film layer 2. θ1 is the incident angle of the first type of ray I irradiating the transparent substrate 1. Angle; θ1' is the incident angle of the second type of ray II illuminating the transparent substrate 1; θ1" is the incident angle of the third type of ray III illuminating the transparent substrate 1; θ2 is the refraction angle of the first type of ray I from the transparent substrate 1 to the second optical film layer 3; θ3 is the incident angle of the first type of ray I from the second optical film layer 2 to the third optical film layer 4; θ0 is the refraction angle of the first type of ray I entering the air; θ0' is the refraction angle of the second type of ray II entering the air; θ0" is the refraction angle of the third type of ray III entering the air.

[0048] Please combine Figure 3 and Figure 9 The first type of light, I, is a large-angle light. This type of light is the light that needs the most adjustment to achieve the anti-spy effect. By adjusting this type of light through the anti-spy optical structure, the emitted light is brought closer to the direction of the light source's direct viewing angle, thereby achieving the purpose of anti-spy.

[0049] Please continue to refer to this. Figure 3 and Figure 9 The first type of light ray I emitted from point A is incident on the first optical film 2 through the optical adhesive 10. Since the refractive index n3 of the optical adhesive 10 is similar to the refractive index nx of the film layer between the light source and the optical adhesive 10, θ5 is close to θ6. At the same time, since the refractive index of the first optical film 2 is greater than the refractive index ng of the transparent substrate 1, θ4 is less than θ6. Therefore, after passing through the first optical film 2, the angle between the first type of light ray I and the vertical direction becomes smaller, which is beneficial to the realization of the privacy protection effect.

[0050] Please continue to refer to this. Figure 3 and Figure 9 Because the angle between the first type of ray I and the vertical direction is reduced after refraction by the first optical film 2, when the first type of ray I shines on the interface between the transparent substrate 1 and the first optical film 2, the first type of ray I is more likely to be on the first side of the normal L1 after adjustment by the first optical film 2 (e.g., Figure 3As shown in the diagram, when the first type of ray I is refracted at the interface between the transparent substrate 1 and the first optical film 2, the propagation direction of the first type of ray I in the transparent substrate 1 is closer to the viewing angle direction compared to the case where the interface is a plane. When the first type of ray I exits from the transparent substrate 1, since the exit surface is an inclined plane, the propagation direction of the first type of ray I is corrected for the second time. Compared to the case where the exit surface is a plane, the propagation direction of the first type of ray is closer to the viewing angle direction.

[0051] Type II light rays are perpendicular to the plane of the optical privacy structure. Please refer to [reference needed]. Figure 9 After passing through the transparent substrate 1, the second type of light beam II has a certain amount of offset relative to the vertical direction. However, since the offset is small, it does not affect the privacy protection effect of the optical privacy protection structure.

[0052] For Type III light rays, please refer to [reference needed]. Figure 3 and Figure 9 Since the third type of ray III is a small-angle ray, when the third type of ray III illuminates the interface between the transparent substrate 1 and the first optical film 2, the third type of ray III, after being adjusted by the first optical film 2, is more likely to be on the first side of the normal L1 than the first type of ray I (e.g., Figure 3 As shown in the diagram, subsequently, the correction of the third type of ray III at the interface between the light-incident side and the light-exit side of the transparent substrate 1 is similar to the correction of the first type of ray I. When the third type of ray III is refracted at the interface between the transparent substrate 1 and the first optical film 2, the propagation direction of the third type of ray III in the transparent substrate 1 is closer to the viewing angle direction compared to the case where the interface is planar. When the third type of ray III is emitted from the transparent substrate 1, since the emission surface is inclined, the propagation direction of the third type of ray III is corrected for the second time. Compared to the case where the emission surface is planar, the propagation direction of the third type of ray III is closer to the viewing angle direction.

[0053] In summary, due to the presence of the first optical film 2, the incident light rays are more likely to be on the first side of the normal L1. Thus, when passing through the interface between the transparent substrate 1 and the first optical film 2, the first type of light ray I and the third type of light ray III converge towards the viewing angle of the light source. When passing through the light-emitting surface of the transparent substrate 1, the first type of light ray I and the third type of light ray III converge again towards the viewing angle of the light source. Therefore, the optical privacy protection structure of the present invention corrects the propagation direction of the first type of wide-angle light ray and the third type of light ray III, making the first type of light ray I and the third type of light ray III closer to the viewing angle of the light source when they are emitted, thereby achieving better privacy protection.

[0054] In some optional embodiments of the present invention, the outer surface or tangent of the outer surface of the first protrusion 11 forms an angle α with the plane of the transparent substrate 1, α = 45° ± 15°; the outer surface or tangent of the outer surface of the second protrusion 13 forms an angle α with the plane of the transparent substrate, α = 45° ± 15°; the inner wall surface or tangent of the inner wall surface of the first concave portion 12 forms an angle α with the plane of the transparent substrate, α = 45° ± 15°; the inner wall surface or tangent of the inner wall surface of the second concave portion 14 forms an angle α with the plane of the transparent substrate, α = 45° ± 15°.

[0055] Please continue to refer to this. Figure 9 The angle between the outer surface of the first protrusion 11 and the second protrusion 13, or the inner wall surface of the first concave portion 12 and the second concave portion 14, and the plane containing the transparent substrate 1 is an important factor affecting the direction of light propagation. An angle of α = 45° ± 15° has a relatively good effect on correcting the light. If the angle α is too large, it is not conducive to light emission. If α is too small, the correction effect is not obvious.

[0056] Please continue to refer to this. Figures 5 to 9 In some optional embodiments of the present invention, the cross-sections of the first protrusion 11, the second protrusion 13, the first concave portion 12, and the second concave portion 14 are all isosceles triangles along the direction perpendicular to the plane of the transparent substrate 1.

[0057] Figure 10 The diagram shown is a schematic diagram of an optical privacy screen structure provided in an embodiment of the present invention. Figure 9 The difference between the structure shown in Figure 10 and the structure shown in Figure 10 is that... Figure 9 In the case where a first protrusion 11 and a second protrusion 13 are provided on both sides of the transparent substrate 1, the cross sections of the first protrusion 11 and the second protrusion 14 are both isosceles triangles. Figure 10 In the case where the first protrusion 11 and the second concave portion 14 are provided on both sides of the transparent substrate 1, the cross-sections of the first protrusion 11 and the second concave portion 14 are both non-isosceles triangles; please continue to refer to Figure 10 When the angle between one side of the first protrusion 11 and the plane of the transparent substrate 1 is 30°, and the angle between the other side of the first protrusion 11 and the plane of the transparent substrate 1 is 60°, and the shape of the second concave portion 14 is the same as the shape of the first protrusion 11, then the fourth type of ray I′ and the fifth type of ray II′ emitted from point A irradiate the optical adhesive 10 at the same incident angle θ6. The fourth type of ray I′ passes through the optical adhesive 10 and the first optical film layer 2 and then irradiates the side of the first protrusion 11 where the angle between it and the plane of the transparent substrate 1 is 60 degrees. The fifth type of ray II′ passes through the optical adhesive 10 and the first optical film layer 2 and then irradiates the side of the first protrusion 11 where the angle between it and the plane of the transparent substrate 1 is 30 degrees. Figure 10It can be seen that the propagation directions of the fourth type of light ray I′ and the fifth type of light ray II′ in the transparent substrate 1 and subsequent film layers are completely inconsistent. Therefore, if the cross-sections of the first convex portion 11 and the second concave portion 14 are preferably isosceles triangles, the final viewing angle range can be symmetrical. For similar reasons, if the cross-sections of the second convex portion 13 and the first concave portion 12 are isosceles triangles, the correction angles of the convex or concave portion for the light rays are consistent, which is more conducive to ensuring the exit angle of the light rays.

[0058] Please continue to refer to this. Figures 5 to 9 In some optional embodiments of the present invention, along the direction perpendicular to the plane where the transparent substrate 1 is located, the cross-sections of the first protrusion 11, the second protrusion 13, the first concave portion 12, and the second concave portion 14 are all isosceles right triangles.

[0059] Please continue to refer to this. Figure 9 The light source at point A is located below the transparent substrate 1. When the first type of light ray I, the second type of light ray II, and the third type of light ray III are incident on the surface of the first protrusion 11 of the transparent substrate 1, they are corrected by a 45° inclined plane to ensure that the incident angles θ1 of the first type of light ray I, θ1' of the second type of light ray II, and θ1" of the third type of light ray III are mostly between 0-45°. Similarly, when the first type of light ray I, the second type of light ray II, and the third type of light ray III exit from the interface of the second protrusion 13, they are also corrected once. After two corrections, the first type of light ray I, the second type of light ray II, and the third type of light ray III can be effectively aligned with the direction of the frontal viewing angle compared to the case where the two sides of the transparent substrate 1 are flat, and the symmetry of the emitted light rays is good, thus achieving a better anti-peeping effect.

[0060] Figure 11 This is a partial magnified view of one side surface of the transparent substrate provided in an embodiment of the present invention. In some optional embodiments of the present invention, the first protrusion 11 is conical or pyramidal in shape; the second protrusion 13 is conical or pyramidal in shape; the first recess 12 is conical or pyramidal in shape; and the second recess 14 is conical or pyramidal in shape.

[0061] Specifically, please refer to Figure 11Taking the shape of the first protrusion 11 as a pyramid as an example, the surface of the first protrusion 11 is composed of multiple inclined planes. The angles between the multiple inclined planes and the plane containing the transparent substrate 1 are all the same. In this way, the correction angle of the light incident on the surface of the first protrusion 11 is the same for each inclined plane. No matter which direction the light comes from when it is incident on the surface of the first protrusion 11, the same correction angle can be obtained. This ensures that the viewing angle of the final emitted light is controllable, which is beneficial to the realization of the privacy protection effect. The correction principle for the first protrusion 11 being conical, the second protrusion 13 being conical or pyramidal, the first concave portion 12 being conical or pyramidal, and the second concave portion 14 being conical or pyramidal is the same as the correction principle for the first protrusion 11 being pyramidal, and will not be repeated here.

[0062] Please continue to refer to this. Figure 9 In some optional embodiments of the present invention, the optical privacy structure further includes a second optical film layer 3, which is located on the side of the transparent substrate 1 away from the first optical film layer 2. The second optical film layer 3 is attached to the transparent substrate 1, and the surface of the second optical film layer 2 away from the transparent substrate 1 is parallel to the plane of the transparent substrate 1.

[0063] For details, please refer to [link / reference]. Figure 9 Since the light-emitting side of the transparent substrate 1 is provided with a second protrusion 13 or a second recess 14, the light-emitting surface of the transparent substrate 1 is not a plane. In order to achieve a better display effect, a second optical film layer 3 is provided on the side of the transparent substrate 1 where the second protrusion 13 or the second recess 14 is provided. The surface of the second optical film layer 3 away from the transparent substrate 1 is parallel to the plane where the transparent substrate 1 is located. In this way, the light-emitting surface of the optical privacy structure can be located on the same plane, which can improve the display effect of the privacy structure.

[0064] Please continue to refer to this. Figure 9 In some optional embodiments of the present invention, the refractive index of the second optical film layer 3 is less than the refractive index of the transparent substrate 1.

[0065] Specifically, the materials used in optical privacy structures are relatively limited. Based on the refractive index of the transparent substrate, materials with a refractive index higher than that of the transparent substrate are called high refractive index materials, and materials with a refractive index lower than that of the transparent substrate are called low refractive index materials. Since the first optical film layer 2 located on the light-incident side of the transparent substrate 1 is a high refractive index material, if a high refractive index material is selected again on the light-outcident side of the transparent substrate, the propagation direction of light in the first optical film layer 2 and the second optical film layer 3 will be very close or consistent, which is not conducive to correcting the propagation direction of light.

[0066] Figure 12The diagram shown is a schematic of an optical privacy screen structure provided in an embodiment of the present invention. The optical privacy screen structure of the present invention further includes at least one anti-reflection structure, which includes a third optical film layer 4 and a fourth optical film layer 5. The third optical film layer 4 is located between the second optical film layer 3 and the fourth optical film layer 5, and the fourth optical film layer 5 is located on the side of the third optical film layer 4 away from the second optical film layer 2. The refractive index of the fourth optical film layer 5 is n4, and the refractive index of the third optical film layer is n3, where n4 < ng < n3.

[0067] Specifically, to improve the light transmittance of the optical privacy structure, the optical privacy structure of the present invention further includes at least one set of anti-reflection structures. Each set of anti-reflection structures consists of a high-refractive-index optical film and a low-refractive-index optical film, wherein the low-refractive-index optical film is located on the outermost side of the optical privacy structure. It should be noted that... Figure 12 The optical privacy structure contains only one set of anti-reflective structures. In some cases, it may contain multiple sets of stacked anti-reflective structures to reduce the reflectivity of the optical privacy structure surface and increase the light transmittance of the optical privacy structure surface.

[0068] Please continue to refer to this. Figure 12 In some optional embodiments of the present invention, the refractive indices of the second optical film layer 3 and the fourth optical film layer 5 are both greater than or equal to 1.2 and less than or equal to 1.5.

[0069] Specifically, to improve the light transmittance of the optical privacy structure, the fourth optical film layer 5 has the lowest reflectivity and the highest light transmittance when its refractive index relative to the theoretical refractive index of air is around 1.24. Therefore, the fourth optical film layer 5 needs to be made of a low refractive index material, generally a transparent material with a refractive index greater than or equal to 1.2 and less than or equal to 1.5. In addition, according to the laws of light propagation, the refractive indices of the second optical film layer 3 and the fourth optical film layer 5 should be as consistent as possible to ensure that the emission direction remains unchanged. The refractive index of the fourth optical film layer 5 should be as close as possible to that of the air layer to reduce the angle of refraction of light entering the air layer.

[0070] Please continue to refer to this. Figure 12 In some optional embodiments of the present invention, the refractive indices of the first optical film layer 2 and the third optical film layer 4 are both greater than or equal to 1.6 and less than or equal to 1.9.

[0071] Specifically, the first optical film layer 2 of the present invention is a high refractive index optical film layer, the purpose of which is to converge the incident light, so that the transparent substrate 1 can correct the light and thus achieve the privacy protection effect; however, the refractive index of the first optical film layer 2 should not be too high. If the refractive index is too high, it will affect the critical angle of light entering the transparent substrate from the first optical film layer 2, causing some large-angle light to undergo total internal reflection, thereby reducing the amount of light displayed on the light-emitting side. The amount of large-angle light corrected by the transparent substrate 1 will be reduced, and thus the utilization rate of the light source will be reduced; therefore, metal oxides or non-metal oxides with a refractive index of 1.6-1.9 are generally selected as the material of the first optical film layer.

[0072] In order to achieve the anti-reflective effect of the optical privacy structure, the third optical film layer 3 must also be made of a high refractive index material. For the sake of process convenience, the same material as the first optical film layer 2 can be selected.

[0073] The transparent substrate 1 of this invention can be a commonly used transparent material such as glass / PMMA / PC, and regular protrusions or concave parts are formed on its surface through processes such as embossing, etching, and spraying. The protrusions or concave parts can also be formed on the surface of a plastic film such as PET or PE, and then bonded to the surface of the transparent substrate 1 with optical adhesive. The second optical film layer 3 and the fourth optical film layer 5 can be selected from low-refractive materials such as MgF2 and SiO2, with a thickness of 50.00-300 nm. The first optical film layer 2 and the third optical film layer 4 can be made of Al2O3, ZnO, or SiO2. x N y It may be Nb2O5, Ta2O5, or SnO2, with a thickness of 10-80 nm.

[0074] Figure 13 This is a schematic diagram of the structure of a display module provided in an embodiment of the present invention. Please refer to it. Figure 13 The display module of the present invention includes a display panel and any of the above-mentioned optical privacy structures 100, wherein the optical privacy structure is located on the light-emitting side of the display panel 20.

[0075] Specifically, please refer to Figure 13 The optical privacy structure 100 of the present invention is located on the light-emitting side of the display panel 20. The optical privacy structure 100 as a whole can be fixed to the light-emitting side of the display panel by optical adhesive 10 and can be used as a cover plate of the display panel 20. The ink is indicated by reference numeral 11 in the figure.

[0076] Figure 13 The display module shown is merely an example of a specific application of the present invention and is not intended to limit the specific application of the present invention.

[0077] Based on the same inventive concept, the present invention also provides a display device, please refer to [reference needed]. Figure 14 , Figure 14The diagram shown is a structural schematic of a display device provided in an embodiment of the present invention. The display device 200 provided in this embodiment includes the optical privacy structure 100 provided in any of the above embodiments of the present invention.

[0078] It is understood that the display device 200 provided in the embodiments of the present invention can be a computer, mobile phone, tablet, or other display device with display function, and the present invention does not impose specific limitations on it. The display device provided in the embodiments of the present invention has the beneficial effects of the display panel provided in the embodiments of the present invention. For details, please refer to the specific descriptions of the display panel in the above embodiments, which will not be repeated here.

[0079] In summary, the display panel and display device provided by the present invention achieve at least the following beneficial effects:

[0080] First, the present invention provides a first protrusion 11 or a first recess 12 on one or both sides of a transparent substrate 1, and cooperates with a first optical film layer 2 with a high refractive index, so that the display light is brought closer to the viewing angle of the light source, which can achieve privacy protection at a certain angle. Furthermore, this invention achieves privacy protection by changing the light emission angle, and the actual emitted light does not suffer significant loss due to privacy protection, resulting in high light source utilization. Compared to current privacy protection solutions using micro-grating structures and dimming liquid crystal structures, it has higher light transmittance and does not lead to increased backlight power consumption. Secondly, the angle between the protrusions or concave portions on one or both sides of the transparent substrate 1 and the plane of the transparent substrate 1 is 45°±15°. This angle has a good effect on light correction. If the angle α is too large, it is not conducive to light emission; if α is too small, the correction effect is not obvious. Thirdly, along the direction perpendicular to the plane of the transparent substrate 1, the cross-sections of the protrusions or concave portions on one or both sides of the transparent substrate 1 are all isosceles right triangles. Thus, the symmetry of the emitted light from the optical privacy protection structure is good, achieving a better privacy protection effect. In addition, the optical privacy protection structure of this invention also includes at least one set of anti-reflection structures, which can reduce the reflectivity of the surface of the optical privacy protection structure and improve the light transmittance of the surface of the optical privacy protection structure.

[0081] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. An optical privacy structure, characterized by, Includes a transparent substrate and a first optical film layer; The transparent substrate has a plurality of first protrusions on one side, and two adjacent first protrusions are connected to each other. Along a direction perpendicular to the plane of the transparent substrate, the first protrusion has a triangular cross-sectional shape, with the vertex of the triangle located at the top of the first protrusion; the first optical film layer is located on the side of the transparent substrate where the first protrusion is disposed and is in contact with the transparent substrate; a plurality of second protrusions are also disposed on the side of the transparent substrate away from the first optical film layer, with adjacent two second protrusions connected together, and along a direction perpendicular to the plane of the transparent substrate, the second protrusion has a triangular cross-sectional shape, with the vertex of the triangle located at the top of the second protrusion; the outer surface of the first protrusion or the tangent of the outer surface forms an angle α with the plane of the transparent substrate, α = 45° ± 15°; the outer surface of the second protrusion or the tangent of the outer surface forms an angle α with the plane of the transparent substrate, α = 45° ± 15°; Alternatively, a plurality of first recesses are provided on one side of the transparent substrate, with adjacent first recesses connected together; the cross-sectional shape of the first recess is triangular along a direction perpendicular to the plane of the transparent substrate, with the vertex of the triangle located at the bottom of the first recess; the first optical film layer is located on the side of the transparent substrate where the first recesses are provided and is in contact with the transparent substrate; a plurality of second recesses are also provided on the side of the transparent substrate away from the first optical film layer, with adjacent second recesses connected together; the cross-sectional shape of the second recess is triangular along a direction perpendicular to the plane of the transparent substrate, with the vertex of the triangle located at the bottom of the second recess; the inner wall surface or tangent of the inner wall surface of the first recess has an angle α with the plane of the transparent substrate, α=45°±15°; the inner wall surface or tangent of the inner wall surface of the second recess has an angle α with the plane of the transparent substrate, α=45°±15°; The refractive index of the transparent substrate is ng, and the refractive index of the first optical film layer is n1, where ng < n1; It also includes a second optical film layer, which is located on the side of the transparent substrate away from the first optical film layer. The second optical film layer is attached to the transparent substrate, and the surface of the second optical film layer away from the transparent substrate is parallel to the plane of the transparent substrate. The refractive index of the second optical film is less than that of the transparent substrate.

2. The optical security structure of claim 1, wherein Along the direction perpendicular to the plane where the transparent substrate is located, the cross-sections of the first protrusion, the second protrusion, the first concave portion, and the second concave portion are all isosceles triangles.

3. The optical security structure of claim 2, wherein, Along the direction perpendicular to the plane where the transparent substrate is located, the cross-sections of the first protrusion, the second protrusion, the first concave portion, and the second concave portion are all isosceles right triangles.

4. The optical security structure of claim 3, wherein, The first convex part is conical or pyramidal in shape; the second convex part is conical or pyramidal in shape; the first concave part is conical or pyramidal in shape; and the second concave part is conical or pyramidal in shape.

5. The optical security structure of claim 1, wherein It also includes at least one anti-reflection structure, the anti-reflection structure comprising a third optical film layer and a fourth optical film layer, the third optical film layer being located between the second optical film layer and the fourth optical film layer, and the fourth optical film layer being located on the side of the third optical film layer away from the second optical film layer; The refractive index of the fourth optical film is n4, and the refractive index of the third optical film is n3, where n4 < ng < n3.

6. The optical security structure of claim 5, wherein, The refractive indices of both the second and fourth optical films are greater than or equal to 1.2 and less than or equal to 1.

5.

7. The optical privacy structure according to claim 5, characterized in that, The refractive indices of both the first and third optical films are greater than or equal to 1.6 and less than or equal to 1.

9.

8. A display module, characterized in that, It includes a display panel and an optical privacy structure as described in any one of claims 1 to 7, wherein the optical privacy structure is located on the light-emitting side of the display panel.

9. A display device, characterized in that, Includes the display module as described in claim 8.

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