Display screen light limiting cover and display device with specific visual angle

Abstract

The utility model provides a display screen light limiting cover and a display device with a specific visual angle, and the display screen light limiting cover comprises a bottom plate which is provided with a plurality of light outlet holes arranged in an array; the first surface of each reflective barrier is provided with a total reflection surface, the second surface of each reflective barrier is provided with a diffuse reflection surface, the reflective barriers are arranged on the bottom plate in parallel and attached to the bottom plate, the first surfaces of the reflective barriers are arranged close to the light outlet holes, and emergent light emitted from the light outlet holes is reflected towards a first side facing the first surfaces through the total reflection surfaces; when the display screen is in use, emergent light emitted from the light emitting hole is subjected to diffuse reflection towards the second side towards which the second surface faces through the diffuse reflection surface, so that the light emitted by the reflective barrier towards the second side is reduced, the content of the display screen cannot be observed from the second side of the reflective barrier, and the visual angle of the display screen is limited. According to the display screen light limiting cover, the display screen can have a narrow visual angle, and the display screen light limiting cover has the advantages of being simple in structure, low in cost, small in influence on the display effect and the like.

Description

Technical Field

[0001] The utility model relates to a display screen accessory, in particular to a display screen light limiting cover and a display device with a specific viewing angle. Background Art

[0002] With the continuous development of technology, display screens are increasingly used in daily life and work. In certain occasions, we do not want the content of the display screen to be seen by bystanders at certain viewing angles in order to reduce light pollution, protect user privacy and information security, etc. Therefore, how to limit the viewing angle of the display screen to make it suitable for different application scenarios has become an urgent problem to be solved.

[0003] Traditional display light limiting technology is often achieved by adding a special optical film on the display surface or using specific display technology. However, these methods either cannot achieve a narrow viewing angle, are expensive, or have a significant impact on the display effect, making it difficult to meet the needs of the majority of users.

[0004] In order to solve the above problems, the present invention proposes a display screen light limiting cover, which can be set on the display screen. Through a specific structural design, the display screen can have a narrower visual angle. It has the advantages of simple structure, low cost, and little impact on display effect. It has broad application prospects. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a display screen light limiting cover and a display device with a specific viewing angle, so as to solve the problem that the display screen light limiting method in the prior art cannot achieve a narrower viewing angle and cannot take into account both cost and display effect.

[0006] To achieve the above-mentioned purpose, the utility model provides a display screen light limiting cover, which is arranged on the display screen and is used to limit the visual angle of light emitted by the light-emitting unit on the display screen, comprising: a bottom plate, on which a plurality of light-emitting holes arranged in an array are opened, and the positions of the light-emitting holes correspond one-to-one to the light-emitting units on the display screen; a plurality of reflective grilles, a first surface of the reflective grille is provided with a total reflection surface, and a second surface is provided with a diffuse reflection surface, and the plurality of reflective grilles are arranged on the bottom plate in parallel with each other and attached to the bottom plate, and the first surface of the reflective grille is arranged close to the light-emitting holes, the light emitted from the light-emitting holes is reflected toward the first side toward which the first surface faces through the total reflection surface, and the light emitted from the light-emitting holes is diffusely reflected toward the second side toward which the second surface faces through the diffuse reflection surface, thereby reducing the light emitted from the reflective grille toward the second side, so that the content of the display screen cannot be observed from a specific angle of the second side of the reflective grille, thereby limiting the visual angle of the display screen.

[0007] In one embodiment of the utility model application, it also includes: a plurality of light-limiting grilles, which are arranged on the bottom plate and together with the reflective grilles to enclose a plurality of light-limiting chambers, each of the light-limiting chambers corresponds to the light-emitting hole and the light-emitting unit to avoid interference between the emitted light of the light-emitting unit.

[0008] In one embodiment of the present invention, the total reflection surface is a smooth plane and / or a curved surface or a combination of a plane and a curved surface.

[0009] In one embodiment of the present invention, grooves and / or textures are arranged on the diffuse reflection surface.

[0010] In one embodiment of the present utility model application, the reflective grille is vertically or obliquely attached to the base plate, so that by adjusting the angle between the reflective grille and the base plate, the angles of the total reflected light and the diffuse reflected light emitted by the light-emitting unit through the total reflection surface and the diffuse reflection surface of the reflective grille are controlled, thereby achieving further adjustment of the viewing angle.

[0011] In one embodiment of the utility model application, the reflective grille is arranged on the base plate in a longitudinal, transverse or diagonal direction. The above arrangements can adjust the viewing angle of the display screen. At the same time, through the longitudinal, transverse or diagonal arrangement, the viewing angle can be adjusted on the left and right sides, upper and lower sides, and diagonal sides of the display screen, respectively, further enriching the use scenarios of the display screen light limiting cover.

[0012] In one embodiment of the present invention, the reflective grille can be set to different heights according to the required viewing angles. By adjusting the height of the reflective grille, the angle of light emitted directly from the upper edge of the reflective grille by the light-emitting unit is adjusted, thereby achieving the purpose of further controlling the viewing angle of the display screen.

[0013] In one embodiment of the present invention, the light-limiting grating can be set to different heights according to different light-limiting requirements. In this way, the light-limiting effect of each light-limiting cavity can be improved by increasing the height of the light-limiting grating, thereby improving the display effect.

[0014] In one embodiment of the utility model application, the position of the light exit hole relative to the reflective grille can be set to different positions according to the required viewing angle. By adjusting the position of the light exit hole compared to the reflective grille, the angle of the light emitted directly from the upper edge of the reflective grille by the light-emitting unit and the amount of light irradiated on the total reflection surface and the diffuse reflection surface can be adjusted. Specifically, when the light exit hole is close to the total reflection surface, the light reflected by the total reflection surface increases and the light reflected by the diffuse reflection surface decreases. At the same time, the angle range of the light emitted directly from the upper edge of the reflective grille corresponding to the total reflection surface is reduced, and the viewing angle is further narrowed; when the light exit hole is close to the diffuse reflection surface, the light reflected by the diffuse reflection surface increases and the light reflected by the total reflection surface decreases. At the same time, the angle range of the light emitted directly from the upper edge of the reflective grille corresponding to the diffuse reflection surface is reduced, and the viewing angle of the angle range of the light emitted directly from the upper edge of the reflective grille corresponding to the total reflection surface is further expanded, and the viewing angle is increased.

[0015] To achieve the above-mentioned purpose, the utility model also provides a display device with a specific viewing angle, comprising: a display screen light limiting cover as described in any of the aforementioned embodiments; a plurality of light-emitting units arranged in an array, wherein the light-emitting hole cover of the display screen light limiting cover is arranged on the light-emitting unit, and the display screen light limiting cover separates and limits the output light of the light-emitting unit so that it has a specific viewing angle.

[0016] As described above, the display screen light limiting cover and the display device with a specific viewing angle involved in the utility model have the following beneficial effects:

[0017] The display screen light limiting cover of the utility model is provided on the display screen, a reflective grille is arranged on the display screen light limiting cover, and the first surface of the reflective grille is a total reflection surface, and the second surface is a diffuse reflection surface, so that after the outgoing light of the display screen passes through the light exit hole of the display screen light limiting cover, it is totally reflected on the first side of the total reflection surface facing the first surface, and diffusely reflected on the second side of the diffuse reflection surface facing the second surface, thereby reducing the light emitted by the reflective grille toward the second side, so that the content of the display screen cannot be observed from a specific angle of the second side of the reflective grille, thereby limiting the viewing angle of the display screen; thus, the light limiting cover can achieve a limited viewing angle of the display screen;

[0018] The display device with a specific viewing angle of the utility model is provided with a light exit hole cover of the display screen light limiting cover on the light emitting unit thereof, and the light exiting light of the light emitting unit is separated and limited by the display screen light limiting cover so as to have a specific viewing angle, thereby realizing that the display device of the utility model can have a narrower viewing angle; compared with the traditional scheme for realizing the viewing angle, no special optical film or specific display technology is used, thus saving costs; at the same time, since the display technology of the display device of the utility model can adopt a mature display scheme, the imaging effect can also have more choices according to the cost, and the imaging effect is also more controllable;

[0019] The utility model provides a display screen light limiting cover and a display device with a specific viewing angle. By arranging a total reflection surface and a diffuse reflection surface on a reflective grille, the outgoing light of the light-emitting unit is propagated on the first side and the second side of the reflective grille by total reflection and diffuse reflection respectively. The display device thus achieves a narrower viewing angle, lower cost and more controllable imaging effect. This solves the problem that the display screen light limiting method in the prior art either cannot achieve a narrower viewing angle and cannot take into account both cost and display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The display is a front view of the light limiting cover of the display screen of the utility model;

[0021] Figure 2 Display as Figure 1 A partial enlarged view of area A;

[0022] Figure 3 The display is a rear view of the light limiting cover of the display screen of the utility model;

[0023] Figure 4 The display is a top view of the light limiting cover of the display screen of the utility model;

[0024] Figure 5 The display is a bottom view of the light limiting cover of the display screen of the utility model;

[0025] Figure 6 The display is a right view of the light limiting cover of the display screen of the utility model;

[0026] Figure 7 The display is a left view of the light limiting cover of the display screen of the utility model;

[0027] Figure 8 The display is a three-dimensional image (front view) of the light limiting cover of the display screen of the utility model;

[0028] Fig. 9 The display is a three-dimensional image of the light limiting cover of the display screen of the utility model (back side);

[0029] Fig.10 Shown is a schematic diagram of assembling the display screen light limiting cover and the display screen of the utility model.

[0030] Component number description

[0031] 1 Bottom plate

[0032] 11 light hole

[0033] 111 Guide chamfer

[0034] 12 threaded holes

[0035] 13 Maintenance keyhole

[0036] 2 Reflective grille

[0037] 21 Total reflection surface

[0038] 22 Diffuse Surface

[0039] 3 Light-limiting grilles

[0040] 4 Lighting units DETAILED DESCRIPTION

[0041] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terms used here are only for describing specific embodiments and are not intended to limit this application. Spatial related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., can be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "hold" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution in the embodiments of the present invention is further described in detail through the following embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the invention.

[0046] like Figure 1-3 , as shown in 8-10, the utility model provides a display screen light limiting cover, which is arranged on the display screen and is used to limit the visual angle of the light emitted by the light-emitting unit 4 on the display screen, comprising: a bottom plate 1, on which a plurality of light-emitting holes 11 arranged in an array are opened, and the positions of the light-emitting holes 11 correspond one by one to the light-emitting units 4 on the display screen; a plurality of reflective grilles 2, the first surface of the reflective grilles 2 is provided with a total reflection surface 21, and the second surface is provided with a diffuse reflection surface 22, and the plurality of reflective grilles 2 are arranged on the bottom plate in parallel with each other. 1 and is attached to the bottom plate 1, and the first surface of the reflective grille 2 is arranged close to the light exit hole 11, the outgoing light emitted from the light exit hole 11 is reflected toward the first side facing the first surface through the total reflection surface 21, and the outgoing light emitted from the light exit hole 11 is diffusely reflected toward the second side facing the second surface through the diffuse reflection surface 22, thereby reducing the light emitted by the reflective grille 2 toward the second side, so that the content of the display screen cannot be observed from the second side of the reflective grille 2, thereby limiting the viewing angle of the display screen.

[0047] It should be understood that diffuse reflection refers to the phenomenon that light is evenly reflected in different directions when interacting with a rough surface. When light hits a rough surface, due to the irregularity of the surface, the light will be reflected in various directions, so that the light is evenly scattered in all directions. For example, diffuse reflection occurs on surfaces such as walls and stones. The characteristic of diffuse reflection is that it can effectively reduce glare and light spots, so that the light is more evenly distributed on the surface, thereby creating a comfortable lighting environment diffuse reflection effect; it is suitable for scenes that require soft and uniform lighting, such as indoor lighting, soft light effects in photography, etc. Total reflection refers to the phenomenon that when light is incident from a denser medium into a less dense medium, when the angle of incidence is greater than the critical angle, the light is completely reflected. When total reflection occurs, the light does not pass through the denser medium into the less dense medium, but is completely reflected back into the denser medium. This phenomenon often occurs at the interface between a denser medium (such as glass) and a less dense medium (such as air). For example, optical fiber communication uses the principle of total reflection to transmit optical signals.

[0048] In order to better introduce the display screen light limiter of the utility model, it is now explained in combination with the following specific applications: the display screen light limiter of the utility model is provided on the display screen by setting the display screen light limiter on the display screen, setting a reflective grille 2 on the display screen light limiter, and making the first surface of the reflective grille 2 a total reflection surface 21 and the second surface a diffuse reflection surface 22, so that after the outgoing light of the display screen passes through the light exit hole 11 of the display screen light limiter, it is totally reflected on the first side of the total reflection surface 21 facing the first surface, and diffusely reflected on the second side of the diffuse reflection surface 22 facing the second surface, thereby reducing the light emitted by the reflective grille 2 toward the second side, so that the content of the display screen cannot be observed from a specific angle of the second side of the reflective grille 2, thereby limiting the viewing angle of the display screen. Therefore, the display screen light limiter can achieve a limited viewing angle of the display screen.

[0049] In order to enhance the reflection effects of the total reflection surface 21 and the diffuse reflection surface 22, different materials can be used to make the total reflection surface 21 and the diffuse reflection surface 22 of the reflective grille 2. For example, the total reflection surface 21 can be made of glass with a high refractive index, such as common optical glass materials, such as quartz glass, borosilicate glass and other materials, which have a high refractive index and are suitable for making the total reflection surface 21; optical plastics can also be used, and some special optical grade plastic materials can also have a high refractive index, which are also suitable for making the total reflection surface 21. The diffuse reflection surface 22 can be made of special diffuse reflection coatings, white plastics, frosted glass and frosted plastics. The special diffuse reflection coating is usually composed of granular or porous materials, which can make the light evenly reflected on the surface; white plastics usually have a high diffuse reflectivity, which can evenly reflect the light in all directions; glass with a frosted surface has a high diffuse reflectivity, so it can achieve a diffuse reflection effect; frosted plastics are similar to frosted glass, and frosted plastics that have been specially treated can also achieve a diffuse reflection effect.

[0050] Figure 1-10 The light exit hole 11 is a square, and it can also be set to other shapes such as a circle, a rectangle, etc. In addition, the size of the light emitting unit 4 on the display screen can be less than or equal to the size of the light exit hole, and does not need to be exactly the same size.

[0051] like Figure 3 As shown, a guide chamfer 111 can be provided at the edge of the light exit hole 11 of the bottom plate 1 on the side away from the reflective grille 2, so as to reduce the sharpness of the edges and corners of parts or workpieces when the display screen light limiting cover is assembled with the display screen, reduce the possibility of stress concentration, reduce the risk of accidental damage, improve safety and the service life of parts such as the bottom plate 1 and the light-emitting element, and also make the edges of the aforementioned parts easier to insert, assemble or disassemble, thereby improving assembly efficiency and convenience.

[0052] In one embodiment of the utility model application, it also includes: a plurality of light-limiting grilles 3, which are arranged on the bottom plate 1 and together with the reflective grilles 2 enclose a plurality of light-limiting chambers, each of which corresponds to the light-emitting hole 11 and the light-emitting unit 4 to avoid interference between the emitted light of the light-emitting unit 4.

[0053] The light exit holes 11 may be arranged in a circular array, and when the light exit holes 11 of the circular array do not meet the requirements of alignment in each row and alignment in each column, the arrangement of the reflective grille 2 and the light limiting grille 3 is as follows: a small reflective grille 2 and a light limiting grille 3 having a length slightly larger than the size of the light exit hole 11 are respectively arranged next to each light exit hole 11. When the light exit holes 11 of the circular array strictly meet the requirements of alignment in each row and alignment in each column, the arrangement of the reflective grille 2 and the light limiting grille 3 is as follows: an integral reflective grille 2 or a light limiting grille 3 is arranged in each column or each row.

[0054] like Figure 4-7 As shown, the reflective grille 2 is generally slightly higher than the light-limiting grille 3 to achieve better reflective and light-limiting effects, but in exceptional cases the reflective grille 2 may be lower than the light-limiting grille 3 .

[0055] like Figure 1-2 As shown in FIG. 9 , a plurality of maintenance lock holes 13 may be provided on the floor of the display screen light limiting cover to facilitate installation or removal of the display screen light limiting cover and the display screen, thereby facilitating assembly of the two.

[0056] like Figure 1-3 , as shown in FIG9 , a plurality of threaded holes 12 can be provided on the display screen light limiting cover, and a plurality of threaded holes 12 can also be provided at corresponding positions of the display screen. When the display screen light limiting cover is provided on the display screen, the two can be fixedly connected by means of threads and the aforementioned threaded holes 12. In addition, the display screen light limiting cover and the display screen can also be connected and fixed by other common mechanical connection methods such as welding connection, riveting connection, and adhesive connection, which will not be described in detail in this application. Fig.10 The figure shows a schematic diagram of the structure after the display screen light limiting cover and the display screen are assembled.

[0057] In one embodiment of the present invention, the total reflection surface 21 is a smooth plane and / or a curved surface or a combination of a plane and a curved surface.

[0058] In one embodiment of the present invention, grooves and / or textures are disposed on the diffuse reflection surface 22 .

[0059] In one embodiment of the present utility model application, the reflective grille 2 is vertically or obliquely attached to the base plate 1, so that by adjusting the angle between the reflective grille 2 and the base plate 1, the angle of the total reflected light and the diffusely reflected light emitted by the light-emitting unit 4 through the reflective grille 2 is controlled, thereby achieving further adjustment of the viewing angle.

[0060] In one embodiment of the utility model application, the reflective grille 2 is arranged on the base plate 1 in a longitudinal, transverse or diagonal arrangement. The above arrangements can adjust the viewing angle of the display screen. At the same time, through the longitudinal, transverse or diagonal arrangement, the viewing angle can be adjusted on the left and right sides, upper and lower sides, and diagonal sides of the display screen, respectively, further enriching the scene of the display screen light limiting cover.

[0061] In one embodiment of the present invention, the reflective grille 2 can be set to different heights according to the required viewing angles. By adjusting the height of the reflective grille 2, the angle of light emitted directly from the upper edge of the reflective grille 2 by the light-emitting unit 4 is adjusted, thereby achieving the purpose of further controlling the viewing angle of the display screen.

[0062] In one embodiment of the present invention, the light-limiting grating 3 can be set to different heights according to different light-limiting requirements. In this way, the light-limiting effect of each light-limiting cavity can be improved by increasing the height of the light-limiting grating 3, thereby improving the display effect.

[0063] In one embodiment of the present invention, the position of the light exit hole 11 relative to the reflective grille 2 can be set to different positions according to different required viewing angles. By adjusting the position of the light exit hole 11 relative to the reflective grille 2, the angle of the light emitted directly from the upper edge of the reflective grille 2 by the light emitting unit 4 and the amount of light irradiated on the total reflection surface 21 and the diffuse reflection surface 22 can be adjusted. Specifically, when the light exit hole 11 is close to the total reflection surface 21, the light reflected by the total reflection surface 21 increases and the light reflected by the diffuse reflection surface 22 increases. The light emitted is reduced, and at the same time, the angle range of the light directly emitted from the upper edge of the reflective grille 2 corresponding to the total reflection surface 211 is reduced, and the viewing angle is further narrowed; when the light exit hole 11 is close to the diffuse reflection surface 22, the light reflected by the diffuse reflection surface 22 increases and the light reflected by the total reflection surface 21 is reduced, and at the same time, the angle range of the light directly emitted from the upper edge of the reflective grille 2 corresponding to the diffuse reflection surface 22 is reduced, and the viewing angle of the light directly emitted from the upper edge of the reflective grille 2 corresponding to the total reflection surface 21 is further expanded, and the viewing angle is increased.

[0064] To achieve the above-mentioned purpose, the utility model also provides a display device with a specific viewing angle, comprising: a display screen light limiting cover as described in any of the aforementioned embodiments; a plurality of light-emitting units 4 arranged in an array, wherein the light-emitting holes 11 of the display screen light limiting cover are covered on the light-emitting units 4, and the display screen light limiting cover separates and limits the outgoing light of the light-emitting units 4 so that it has a specific viewing angle.

[0065] In order to better introduce the display screen light limiting cover of the present invention, it is now explained in combination with the following specific applications: the display device with a specific viewing angle of the present invention is achieved by covering the light outlet hole 11 of the above-mentioned display screen light limiting cover on the light-emitting unit 4, and separating and limiting the outgoing light of the light-emitting unit 4 through the display screen light limiting cover so that it has a specific viewing angle, thereby realizing that the display device of the present invention can have a narrower viewing angle; compared with the traditional solution for achieving the viewing angle, no special optical film or specific display technology is used, thereby saving costs; at the same time, since the display technology of the display device of the present invention can adopt a mature display solution, the imaging effect can also have more options according to the cost, and the imaging effect is also more controllable.

[0066] The utility model provides a display screen light limiting cover and a display device with a specific viewing angle. By arranging a total reflection surface 21 and a diffuse reflection surface 22 on a reflective grille 2, the outgoing light of the light-emitting unit 4 is propagated on the first side and the second side of the reflective grille 2 by total reflection and diffuse reflection respectively. The display device thus achieves a narrower viewing angle, lower cost and more controllable imaging effect. This solves the problem that the display screen light limiting method in the prior art cannot achieve a narrower viewing angle and cannot take into account both cost and display effect.

[0067] In summary, the display screen light limiting cover of the utility model has the following advantages:

[0068] 1. Viewing angle limitation: By arranging the reflective grille 2 on the bottom plate 1 and utilizing the characteristics of the total reflection surface 21 and the diffuse reflection surface 22, the viewing angle of the display screen is effectively limited, thereby improving the privacy of the displayed content.

[0069] 2. Structural design optimization: The fitting design of the reflective grille 2 and the bottom plate 1, as well as the combined effect of the light-limiting grille 3, avoids interference between the light of the light-emitting unit 4 and improves the display effect.

[0070] 3. Adjusting the light angle: The reflective grille 2 and the light-limiting grille 3 can be attached to the bottom plate 1 vertically or obliquely, and the reflection of light can be controlled by adjusting the angle to achieve the adjustment of the viewing angle.

[0071] 4. Cost-effectiveness: Compared with the traditional solution of achieving narrow viewing angle, the utility model does not rely on special optical films or display technologies, thus saving costs.

[0072] Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A display screen light limiting cover, which is arranged on the display screen and is used to limit the visual angle of the light emitted by the light emitting unit on the display screen, characterized in that: include: A bottom plate, wherein a plurality of light exit holes arranged in an array are formed on the bottom plate, and positions of the light exit holes correspond one-to-one to light emitting units on the display screen; A plurality of reflective grilles, wherein a total reflection surface is provided on a first surface of the reflective grilles, and a diffuse reflection surface is provided on a second surface. The plurality of reflective grilles are arranged on the bottom plate in parallel with each other and are attached to the bottom plate, and the first surface of the reflective grilles is arranged close to the light exit hole. The outgoing light emitted from the light exit hole is reflected toward a first side toward which the first surface faces via the total reflection surface, and the outgoing light emitted from the light exit hole is diffusely reflected toward a second side toward which the second surface faces via the diffuse reflection surface, thereby reducing the light emitted from the reflective grille toward the second side, so that the content of the display screen cannot be observed from a specific angle of the second side of the reflective grille, thereby limiting the viewing angle of the display screen.

2. The display screen light limiting cover according to claim 1, characterized in that: The total reflection surface is composed of one or both of a smooth plane and a smooth curved surface.

3. The display screen light limiting cover according to claim 1, characterized in that: The diffuse reflection surface is provided with grooves and / or textures.

4. The display screen light limiting cover according to claim 1, characterized in that: The reflective grille is vertically or obliquely attached to the bottom plate.

5. The display screen light limiting cover according to claim 1, characterized in that: The reflective grilles are arranged on the bottom plate in a longitudinal, transverse or oblique direction.

6. The display screen light limiting cover according to claim 1, characterized in that: The reflective grille can be set to different heights according to different required viewing angles.

7. The display screen light limiting cover according to claim 1, characterized in that: Also includes: A plurality of light-limiting grilles are arranged on the bottom plate and enclose a plurality of light-limiting chambers together with the reflective grilles. Each of the light-limiting chambers corresponds to the light-emitting hole and the light-emitting unit to avoid interference between the light emitted by the light-emitting unit.

8. The display screen light limiting cover according to claim 7, characterized in that: The light-limiting grille can be set to different heights according to different light-limiting requirements.

9. The display screen light limiting cover according to claim 1, characterized in that: The position of the light exit hole relative to the reflective grille can be set to different positions according to different required viewing angles.

10. A display device with a specific viewing angle, characterized in that: include: The display screen light limiting cover according to any one of claims 1 to 9; A plurality of light-emitting units are arranged in an array, and the light-emitting holes of the display screen light-limiting cover are arranged on the light-emitting units. The display screen light-limiting cover separates and limits the emitted light of the light-emitting units so as to have a specific viewing angle.

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