Light guide plate, backlight module and display screen

Abstract

The utility model relates to the technical field of display, in particular to a light guide plate, a backlight module and a display screen. The light guide plate comprises a body, a first microstructure is arranged on the body, the first microstructure is provided with a first surface and a second surface, the first surface and the second surface are connected to form a ridge line, and the ridge line extends in the arrangement direction of light sources; the first surface deviates from the light source, the second surface faces the light source, the first surface is a plane, and the second surface is an arc surface. According to the display screen, the second surface of the first microstructure is arranged to be the cambered surface, so that more light rays scattered by the cambered surface can be irradiated to the display module, the visual angle offset of the display screen is further reduced, when an observer with a large visual angle observes the display screen, the observed local area of the display screen does not become black and dark, and the display effect of the display screen is improved. And user watching experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a light guide plate, a backlight module and a display screen. Background Art

[0002] With the development of display technology, terminal devices such as in-vehicle displays, mobile phones, and computers have been more and more widely used. Generally, terminal devices have a large viewing angle, and users at different viewing angles can obtain the information they display. However, in some scenarios, users hope that the information displayed on the terminal device cannot be known by other surrounding users, and they hope that the terminal device has an anti-peeping function.

[0003] In the prior art, people usually add an anti-peeping film to the display screen of the terminal device. By filtering the light at a large viewing angle through the anti-peeping film, only the light at a small angle that is almost perpendicular to the display screen is retained, so that users at a large viewing angle cannot receive the picture displayed on the display screen. However, the anti-peeping function of the display screen in the prior art lacks controllability and cannot achieve autonomous anti-peeping. If the main driver wants to share the information on the display with the co-driver at a specific viewing angle for viewing and discussion, the display needs to be adjusted to the correct angle to let the co-driver see it, which is cumbersome to operate and is not conducive to the user's viewing experience. In addition, some display screens of terminal devices in the prior art have an autonomous anti-peeping function. However, the viewing angle difference is large, so when an observer at a large viewing angle observes the display screen, the local area of the display screen observed will be dark and dim, which will affect the user's viewing experience.

[0004] Therefore, it is urgent to design a light guide plate, a backlight module and a display screen to solve the above technical problems. Summary of the Utility Model

[0005] The first object of the utility model is to provide a light guide plate. The viewing angle difference of the picture displayed by the display screen using this light guide plate is small, and it can achieve autonomous anti-peeping, improving the user's viewing experience.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] The utility model provides a light guide plate, comprising:

[0008] A body, on which a first microstructure is arranged. The first microstructure has a first surface and a second surface, and the first surface and the second surface are joined to form a ridge line, which extends along the arrangement direction of the light source; the first surface faces away from the light source, the second surface faces the light source, the first surface is a plane, and the second surface is a curved surface.

[0009] As an alternative technical solution of the light guide plate, a plurality of the first microstructures are provided; and in a direction gradually away from the light source, the widths of the first microstructures increase in sequence, and the heights of the first microstructures increase in sequence.

[0010] As an alternative technical solution of the light guide plate, the included angle α between the first surface and the horizontal plane is not greater than 90°, and the included angle β between the second surface and the horizontal plane is not greater than 90°.

[0011] As an alternative technical solution of the light guide plate, the radius of the circle where the arc surface is located is set to be 40 um to 80 um.

[0012] As an alternative technical solution of the light guide plate, the first microstructures are located on the upper surface and / or the lower surface of the body.

[0013] As an alternative technical solution of the light guide plate, a plurality of the first microstructures are provided, and the plurality of first microstructures are arranged at equal intervals, continuously or scatteredly.

[0014] As an alternative technical solution of the light guide plate, the upper surface and / or the lower surface of the body is provided with second microstructures, and the second microstructures are concave or convex;

[0015] The second microstructures are integrally formed with the body, or a film layer is attached to the body, and the second microstructures are provided on the film layer.

[0016] As an alternative technical solution of the light guide plate, the second microstructures are arc-shaped structures or polygonal structures.

[0017] As an alternative technical solution of the light guide plate, the side surface of the body close to the light source is provided with third microstructures, and the third microstructures are arc-shaped structures or polygonal structures.

[0018] The second object of the present invention is to provide a backlight module, which has an independent anti-peeping function, and at the same time has a small viewing angle difference, which can improve the user viewing experience.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] The present invention provides a backlight module, which includes a first light guide plate, a first light source, a second light guide plate, a second light source and an anti-peeping film. The first light source is arranged on the side surface of the first light guide plate, and the second light source is arranged on the side surface of the second light guide plate; the second light guide plate is the light guide plate described above; the anti-peeping film is arranged between the first light guide plate and the second light guide plate.

[0021] As an alternative technical solution of the backlight module, the backlight module further includes a reflective film, and the reflective film is disposed on a side of the first light guide plate away from the privacy film;

[0022] And / or, the backlight module further includes a diffusion film, and the diffusion film is disposed between the first light guide plate and the privacy film;

[0023] And / or, the backlight module further includes a prism film, and the prism film is disposed between the diffusion film and the privacy film.

[0024] As an alternative technical solution of the backlight module, the backlight module further includes a cylindrical lens film, and a fourth microstructure is disposed on an upper surface and / or a lower surface of the cylindrical lens film. The fourth microstructure is an arc-shaped structure or a polygonal structure, and the cylindrical lens film is disposed on a side of the second light guide plate away from the privacy film.

[0025] A third object of the present invention is to provide a display screen, which has an autonomous privacy protection function, and at the same time has a small viewing angle difference, and can improve the user viewing experience.

[0026] To achieve this object, the present invention adopts the following technical solutions:

[0027] The present invention provides a display screen, and the display screen includes a display module and the above-mentioned backlight module.

[0028] The beneficial effects of the present invention at least include:

[0029] The present invention provides a light guide plate, which includes a body, and a first microstructure is disposed on the body. The first microstructure has a first surface and a second surface, and the first surface and the second surface are joined to form a ridge line, and the ridge line extends along the arrangement direction of the light sources; the first surface faces away from the light sources, the second surface faces the light sources, the first surface is a plane, and the second surface is an arc surface. By setting the second surface of the first microstructure as an arc surface and the second surface facing the light sources, when the light sources are turned on, the arc-shaped second surface can scatter the light, so that the light scattered by the arc surface can be irradiated onto the display module more, thereby reducing the viewing angle difference of the display screen, and when an observer at a large viewing angle observes the display screen, the local area of the display screen observed will not appear black and dark, improving the user viewing experience.

[0030] The present invention further provides a backlight module, which has an autonomous privacy protection function, and at the same time has a small viewing angle difference, and can improve the user viewing experience.

[0031] The present invention further provides a display screen, which has an autonomous privacy protection function, and at the same time has a small viewing angle difference, and can improve the user viewing experience. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the content of the embodiments of the present invention and these accompanying drawings.

[0033] Figure 1 Schematic structural diagram of the first microstructure of the light guide plate provided in the first embodiment of the present invention;

[0034] Figure 2 Top view of the first microstructure of the light guide plate provided in the first embodiment of the present invention;

[0035] Figure 3 Side view of the first microstructure of the light guide plate provided in the first embodiment of the present invention;

[0036] Figure 4 Schematic structural diagram of the spaced arrangement of the first microstructure of the light guide plate provided in the first embodiment of the present invention;

[0037] Figure 5 Schematic structural diagram of the continuous arrangement of the first microstructure of the light guide plate provided in the first embodiment of the present invention;

[0038] Figure 6 Schematic structural diagram of the scattered arrangement of the first microstructure of the light guide plate provided in the first embodiment of the present invention;

[0039] Figure 7 Schematic structural diagram of the light guide plate with a second microstructure provided in the second embodiment of the present invention;

[0040] Figure 8 Schematic structural diagram of the light guide plate with a first microstructure and a second microstructure provided in the second embodiment of the present invention Figure 1 ;

[0041] Figure 9 Schematic structural diagram of the light guide plate with a first microstructure and a second microstructure provided in the second embodiment of the present invention Figure 2 ;

[0042] Figure 10 Schematic structural diagram of the light guide plate with a third microstructure provided in the third embodiment of the present invention;

[0043] Figure 11 Schematic structural diagram of the light guide plate with a first microstructure and a third microstructure provided in the third embodiment of the present invention;

[0044] Figure 12 Structural schematic diagram of the light guide plate with the first microstructure, the second microstructure and the third microstructure provided in the third embodiment of the present utility model;

[0045] Figure 13 Structural schematic of the backlight module provided in the fourth embodiment of the present utility model Figure 1 ;

[0046] Figure 14 Structural schematic of the backlight module provided in the fourth embodiment of the present utility model Figure 2 ;

[0047] Figure 15 Schematic diagram of the backlight module provided in the fourth embodiment of the present utility model in the anti-peeping mode;

[0048] Figure 16 Schematic diagram of the backlight module provided in the fourth embodiment of the present utility model in the sharing mode;

[0049] Figure 17 Structural schematic diagram of the backlight module with a cylindrical lens film provided in the fifth embodiment of the present utility model;

[0050] Figure 18 Structural schematic diagram of the backlight module provided in the fifth embodiment of the present utility model;

[0051] Figure 19 Schematic diagram of the display screen provided in the sixth embodiment of the present utility model in the anti-peeping mode;

[0052] Figure 20 Simulated field diagram of the display screen provided in the sixth embodiment of the present utility model in the anti-peeping mode;

[0053] Figure 21 Schematic diagram of the display screen provided in the sixth embodiment of the present utility model in the sharing mode;

[0054] Figure 22 Simulated field diagram of the display screen provided in the sixth embodiment of the present utility model in the sharing mode;

[0055] Figure 23 Schematic diagram of the display screen with bilateral light sources provided in the seventh embodiment of the present utility model;

[0056] Figure 24 Simulated field diagram of the display screen with bilateral light sources provided in the seventh embodiment of the present utility model in the sharing mode.

[0057] Reference numerals

[0058] 100, backlight module; 110, first light guide plate; 120, first light source; 130, second light guide plate; 140, second light source; 150, anti-peeking film; 160, prism film; 170, cylindrical lens film; 180, diffusion film; 190, reflection film; 200, display module; 300, first microstructure; 310, first surface; 320, second surface; 330, ridge line; 400, second microstructure; 500, third microstructure; 600, fourth microstructure. Detailed implementation mode

[0059] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific implementation modes.

[0060] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0061] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0062] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0063] In the description of this embodiment, if not specifically stated, the term "a plurality of" refers to two or more in number.

[0064] Embodiment 1

[0065] This embodiment provides a light guide plate. The picture displayed on the display screen using this light guide plate has a small viewing angle difference, can achieve autonomous anti-peeping, and can improve the user viewing experience.

[0066] As Figures 1 - 6 shown, the light guide plate includes a body, on which a first microstructure 300 is provided. The first microstructure 300 has a first surface 310 and a second surface 320. The first surface 310 and the second surface 320 are joined to form a ridge line 330, and the ridge line 330 extends along the width direction of the body (i.e., the arrangement direction of the light sources); the first surface 310 faces away from the light source, the second surface 320 faces the light source, the first surface 310 is a plane, and the second surface 320 is a curved surface.

[0067] Based on the above design, by setting the second surface 320 of the first microstructure 300 as a curved surface and the second surface 320 facing the light source, when the light source is turned on, the curved second surface 320 can scatter the light, so that the light scattered by the curved surface can be irradiated onto the display module (not shown in the figure) more, thereby reducing the viewing angle difference of the display screen (not shown in the figure), so that when an observer at a large viewing angle observes the display screen, the local area of the display screen observed will not appear black or dark, improving the user viewing experience.

[0068] Optionally, the angle α between the first surface 310 and the horizontal plane in this embodiment is not greater than 90°, and the angle β between the second surface 320 and the horizontal plane is not greater than 90°. Exemplarily, the angle α between the first surface 310 and the horizontal plane can be set to 50° - 90°, and the angle β between the second surface 320 and the horizontal plane can be set to 10° - 50°. By setting both the angle α and the angle β to be not greater than 90°, it is beneficial to scatter the light, so that the light can be scattered within the viewing angle range of an observer at a large viewing angle, so that when an observer at a large viewing angle observes the display screen, the local area of the display screen observed will not appear black or dark. If the angle is greater than 90°, at this time the light will be directly reflected to the side of the light guide plate, so that it cannot enter the viewing range of the observer, resulting in the observer being unable to observe the picture on the display screen and bringing a bad experience to the observer.

[0069] Exemplarily, the distance between the ridge line 330 and the horizontal plane (the height of the first microstructure 300) can be set to 0.1 um to 10 um. When this distance is less than 0.1 um, it will cause the first microstructure 300 to not scatter light well, and then there will be a phenomenon of local darkening on the display screen, affecting the viewing experience of the observer; when this distance is greater than 10 um, the ridge line 330 is too close to the upper surface of the body, which easily leads to the phenomenon of the body breaking, reducing the reliability of the light guide plate. Therefore, the distance between the ridge line 330 and the horizontal plane can be set to 0.1 um to 10 um, which can not only scatter light well but also improve the reliability of the light guide plate.

[0070] Optionally, multiple first microstructures 300 in this embodiment are arranged such that, along the direction gradually away from the light source, the width of the first microstructure 300 increases successively, and the height of the first microstructure 300 increases successively. In other words, along the direction gradually away from the light source, both the height and width of the first microstructure 300 gradually increase, thus forming a gradually changing structure of the first microstructure 300, which can control the uniformity of the light output, making the light emitted from each position on the display screen as consistent as possible, improving the display effect, and enhancing the viewing experience of the observer.

[0071] The direction gradually away from the light source in this embodiment is Figure 4 the X-axis direction in

[0072] Exemplarily, the width gradient range of the first microstructure 300 can be set to gradually transition from 0.1 um to 10 um, and the height gradient range of the first microstructure 300 can be set to gradually transition from 0.1 um to 10 um.

[0073] Exemplarily, the radius of the circle where the arc surface is located can be set to 40 um to 80 um. When the radius of the circle where the arc surface is located is less than 40 um, it is difficult for the second surface 320 to scatter light well, and then there will be a phenomenon of local darkening on the display screen, affecting the viewing experience of the observer; when the radius of the circle where the arc surface is located is greater than 80 um, the processing difficulty of the first microstructure 300 increases, increasing the cost. Therefore, setting the radius of the circle where the arc surface is located to 40 um to 80 um can not only scatter light well but also achieve the purpose of cost savings. In addition, the operator can also set the radius of the circle where the arc surface is located to other values according to actual needs, which will not be elaborated here.

[0074] For example, in the present embodiment, the first microstructure 300 can be set to be multiple, and the spacing between two adjacent first microstructures 300 can be set to be between 50um and 250um, which can improve the uniformity of light scattering and avoid the phenomenon of local darkening and blackening on the display screen, which affects the viewing experience of the observer. Of course, the operator can flexibly set the spacing between two adjacent first microstructures 300 according to actual needs, which will not be repeated here.

[0075] It can be understood that the plurality of first microstructures 300 in this embodiment can be arranged at equal intervals (eg Figure 4 ), or can be set continuously (as shown Figure 5 As shown), or they can be arranged randomly (as shown Figure 6 As shown), the flexibility and compatibility of the first microstructure 300 are improved, so that the light guide plate can be suitable for and meet the different needs of customers for products, saving costs.

[0076] For example, the first microstructure 300 may be disposed on the upper surface, or the lower surface, or both the upper surface and the lower surface of the body.

[0077] Optionally, the first surface 310 in the present embodiment is set as a plane, which is helpful to improve the demolding process in the process of manufacturing the light guide plate, facilitate the demolding of the light guide plate, thereby improving the demolding efficiency and achieving the purpose of cost saving.

[0078] Embodiment 2

[0079] like Figures 7 - 8 As shown, this embodiment provides a light guide plate, which is mainly different from the first embodiment in that: in this embodiment, a second microstructure 400 is provided on one side of the body facing the display module (not shown) and / or on one side of the body away from the display module; that is, the second microstructure 400 is provided on the upper surface and / or the lower surface of the body. The second microstructure 400 is concave or convex. Optionally, the second microstructure 400 is integrally formed with the body to simplify the processing process and improve work efficiency.

[0080] Specifically, by setting the second microstructure 400 on the upper surface and / or the lower surface of the body, the first microstructure 300 is arranged along the first direction, and the second microstructure 400 is arranged along the second direction, and the first direction is perpendicular to the second direction. Figure 8 The X-axis direction in the second direction is Figure 8 In the Y-axis direction, the second microstructure 400 can diffuse the light in the Y-axis direction, thereby improving defects such as light shadows on the display screen, improving the uniformity of the display screen, and further improving the observer's experience.

[0081] Exemplarily, the second microstructure 400 is arc-shaped or polygonal, which can scatter the light entering the light guide plate well in the Y-axis direction, improve defects such as lamp shadows on the display screen, enhance the uniformity of the display image, and improve the observer's experience. For example, the second microstructure 400 is semi-cylindrical, with its height set to 1um - 10um and the arc radius of the semi-cylindrical second microstructure 400 set to 10um - 100um.

[0082] Optionally, multiple second microstructures 400 can be provided, and the multiple second microstructures 400 are equally spaced or continuously arranged, thereby improving the uniformity of light scattering. Or the second microstructures 400 are randomly arranged to improve the processing efficiency of the light guide plate and save costs. At the same time, the equal-spacing arrangement, continuous arrangement or random arrangement of the multiple second microstructures 400 can improve the flexibility and compatibility of the setting of the second microstructures 400, and further enable the light guide plate to be applicable to and meet different customer requirements for products, saving costs.

[0083] Optionally, as Figure 8 shown, the lower surface of the body in this embodiment can be provided with the first microstructure 300, and the upper surface is provided with the second microstructure 400, forming a solution of "lower surface first microstructure 300 + upper surface second microstructure 400".

[0084] Optionally, the lower surface of the body in this embodiment can be provided with the first microstructure 300, and the lower surface is provided with the second microstructure 400, forming a solution of "lower surface first microstructure 300 + lower surface second microstructure 400".

[0085] Optionally, the lower surface of the body in this embodiment can be provided with the first microstructure 300, and both the upper surface and the lower surface are provided with the second microstructure 400, forming a solution of "lower surface first microstructure 300 + lower surface second microstructure 400 + upper surface second microstructure 400".

[0086] Of course, the operator can also flexibly arrange and combine the actual positions of the first microstructure 300 and the second microstructure 400 on the body according to actual needs to implement solutions with different body structures, which will not be elaborated here one by one.

[0087] Optionally, as Figure 9 shown, a film layer is provided on the body, and the second microstructure 400 is provided on the film layer. In this way, the second microstructure 400 can be connected to the body by bonding, thereby reducing the processing difficulty of the body, improving the processing efficiency, and saving costs. The solutions of providing a film layer on the body and arranging the second microstructure 400 on the film layer can all be flexibly adapted to the above various body structure solutions, which will not be elaborated here one by one.

[0088] The remaining structures of the light guide plate in this embodiment are the same as those in Embodiment 1, and will not be elaborated here one by one.

[0089] Embodiment 3

[0090] As Figures 10 - 12 shown, the light guide plate provided in this embodiment is mainly different from those in Embodiment 1 and Embodiment 2 in that: a third microstructure 500 is provided on the side of the body close to the light source, and the third microstructure 500 is configured to scatter the light entering the body.

[0091] Exemplarily, the third microstructure 500 in this embodiment is concave or convex.

[0092] Exemplarily, the third microstructure 500 can be provided in multiple numbers, and the multiple third microstructures 500 are arranged at equal intervals, continuously or scattered.

[0093] Exemplarily, the third microstructure 500 in this embodiment is an arc-shaped structure, the arc radius of the third microstructure 500 can be set to 10um - 100um, the depth can be set to 1um - 50um, and the distance between two adjacent third microstructures 500 can be set to 0um - 100um.

[0094] Of course, in some alternative embodiments, the third microstructure 500 can be a polygonal structure.

[0095] Optionally, as Figure 11 shown, a first microstructure 300 can be provided on the lower surface of the body in this embodiment, and a third microstructure 500 can be provided on the side surface of the body, forming a solution of "first microstructure 300 on the lower surface + third microstructure 500 on the side surface".

[0096] Optionally, as Figure 12 shown, a first microstructure 300 can be provided on the lower surface of the body in this embodiment, a second microstructure 400 can be provided on the upper surface of the body, and a third microstructure 500 can be provided on the side surface of the body, forming a solution of "first microstructure 300 on the lower surface + second microstructure 400 on the upper surface + third microstructure 500 on the side surface".

[0097] It can be understood that the operator can flexibly combine the first microstructure 300, the second microstructure 400 and the third microstructure 500 according to actual needs, so as to form solutions for bodies with different structures, which will not be elaborated here one by one.

[0098] The remaining structures of the light guide plate in this embodiment are the same as those in Embodiment 1, and will not be elaborated here one by one.

[0099] Embodiment 4

[0100] As Figures 13 - 16As shown in the figure, this embodiment provides a backlight module 100, which includes a first light guide plate 110, a first light source 120, a second light guide plate 130, a second light source 140, and a privacy film 150. The privacy film 150 is disposed between the first light guide plate 110 and the second light guide plate 130. The first light source 120 is disposed on the side of the first light guide plate 110, and the second light source 140 is disposed on the side of the second light guide plate 130. Among them, the second light guide plate 130 can be the light guide plate mentioned in Embodiment 1 to Embodiment 3.

[0101] The backlight module 100 has an independent anti-peeping function, and at the same time, its viewing angle difference is small, which can improve the user viewing experience.

[0102] In this embodiment, the backlight module 100 includes a first light guide plate 110, a first light source 120, a second light guide plate 130, a second light source 140, and a privacy film 150. The privacy film 150 is disposed between the first light guide plate 110 and the second light guide plate 130, and the second light guide plate 130 is disposed on the side close to the display module (not shown in the figure). The first light source 120 is disposed on the side of the first light guide plate 110, and the light emitted by the first light source 120 can enter the first light guide plate 110. The second light source 140 is disposed on the side of the second light guide plate 130, and the light emitted by the second light source 140 can enter the second light guide plate 130. It should be emphasized that the first light guide plate 110 in this embodiment is an ordinary light guide plate, while the second light guide plate 130 is the light guide plate including the first micro-structure 300 described above.

[0103] Exemplarily, the first light source 120 and the second light source 140 in this embodiment can both be set as LED lights, and the first light source 120 and the second light source 140 work independently of each other without affecting each other. The privacy film 150 in this embodiment is a conventional component in the prior art, and its internal structure and working principle will not be elaborated here.

[0104] In this embodiment, the first surface 310 is defined as the side facing away from the second light source 140, and the second surface 320 is defined as the side facing the second light source 140. The second light source 140 can be set as an LED light or other types of light sources. The light emitted by the second light source 140 can enter the second light guide plate 130, and then be scattered by the first surface 310 and the second surface 320 on the first micro-structure 300, so that the light scattered by the second light guide plate 130 has a larger viewing angle, and thus the people at the large viewing angle position can also view the picture on the display module.

[0105] One side facing the second light source 140 in this embodiment, that is, the second surface 320, is set as an arc surface, so that the light scattered by the arc surface can be irradiated onto the display module more, thereby reducing the viewing angle difference of the display screen, so that when an observer at a large viewing angle observes the display screen, the local area of the display screen observed will not appear dark, improving the user viewing experience.

[0106] Optionally, as Figure 14 shown, the backlight module 100 in this embodiment further includes a reflective film 190. The reflective film 190 is disposed on a side of the first light guide plate 110 away from the privacy film 150. The setting of the reflective film 190 can play a role in increasing brightness, thereby improving the brightness of the picture displayed by the display module and improving the user's visual experience.

[0107] Optionally, as Figure 14 shown, the backlight module 100 in this embodiment further includes a diffusion film 180. The diffusion film 180 is disposed between the first light guide plate 110 and the privacy film 150. The setting of the diffusion film 180 can play a role in concealing flaws and mixing light, improving the user's visual experience.

[0108] Optionally, as Figure 14 shown, the backlight module 100 in this embodiment further includes a prism film 160. The prism film 160 is disposed between the diffusion film 180 and the privacy film 150. The setting of the prism film 160 can play a role in increasing brightness, thereby improving the brightness of the picture displayed by the display module and improving the user's visual experience.

[0109] It can be understood that the reflective film 190 and the diffusion film 180 in this embodiment are both standard parts in the prior art. Therefore, the specific structures and working principles thereof will not be elaborated herein.

[0110] Embodiment Five

[0111] As Figures 17 - 18 shown, this embodiment provides a backlight module 100, the main difference from Embodiment Four is that: the backlight module 100 further includes a lenticular film 170, and a fourth microstructure 600 is disposed on the upper surface and / or the lower surface of the lenticular film 170. The lenticular film 170 is disposed on a side of the second light guide plate 130 away from the privacy film 150. Specifically, the lenticular film 170 is disposed between the second light guide plate 130 and the display module. Through the setting of the fourth microstructure 600 on the lenticular film 170, the light emitted from the second light guide plate 130 can be scattered, so that a user at a large angle position can observe the picture on the display module.

[0112] It can be understood that the number, position, shape, and size of the fourth microstructure 600 in this embodiment can be set to be the same as any one of the first microstructure 300, the second microstructure 400, or the third microstructure 500 in the above embodiment, and details will not be elaborated here.

[0113] The remaining structures of the backlight module 100 in this embodiment are the same as those in Embodiment 4, and details will not be elaborated one by one here.

[0114] Embodiment 6

[0115] As Figures 19 - 22 shown, this embodiment further provides a display screen, which includes a backlight module 100 and a display module 200. Among them, the backlight module 100 adopts the backlight module 100 mentioned in Embodiments 4 to 5, and the display module 200 is disposed on the side of the second light guide plate 130 away from the anti-peeping film 150.

[0116] This display screen has an independent anti-peeping function, and at the same time, its viewing angle difference is small, which can improve the user viewing experience.

[0117] Optionally, the display module 200 in the display screen is disposed in front of the backlight module 100, and the backlight module 100 and the display module 200 together form the display screen. Optionally, the display module 200 in this embodiment can be set as a liquid crystal display panel.

[0118] The following takes the co-pilot facing the display screen and the driver being located beside the display screen (i.e., the driver is in the large viewing angle position) as an example for description.

[0119] When the co-pilot does not need to share the picture on the display screen with the driver for viewing, at this time, the co-pilot keeps the first light source 120 of the display screen on and the second light source 140 off. The light emitted by the first light source 120 is reflected by the first light guide plate 110 and then enters the anti-peeping film 150. The anti-peeping film 150 filters the light at a large viewing angle, and then only retains the small-angle light emitted almost vertically. Since the second light guide plate 130 is not turned on, at this time, the second light guide plate 130 is in a natural transparent state. Therefore, the light passing through the anti-peeping film 150 enters the display module 200 almost vertically after passing through the second light guide plate 130 in the natural transparent state for the co-pilot to view the picture. At this time, the person in the large viewing angle position (the driver) cannot receive the picture displayed on the display screen, thus realizing the anti-peeping mode of this display screen.

[0120] When the co-pilot needs to share the screen on the display screen with the driver for viewing, the co-pilot keeps both the first light source 120 and the second light source 140 of the display screen turned on. Light enters both the first light guide plate 110 and the second light guide plate 130. The light in the first light guide plate 110 passes through the privacy film 150 and then through the second light guide plate 130 and enters the display module 200. The light in the second light guide plate 130 directly enters the display module 200. Since the first micro-structure 300 is provided on the body of the second light guide plate 130, the first micro-structure 300 can scatter the light, expanding the angle of the light entering the display module 200. As a result, people in the large viewing angle position (the driver) can also view the screen on the display module 200, thus realizing the sharing mode of the display screen. At the same time, the second surface 320 of the first micro-structure 300 is an arc surface, and the light scattered by the arc surface can be more irradiated on the display module 200, thereby avoiding the phenomenon of dark areas on the display module 200 and improving the user's viewing experience.

[0121] The display screen structure in this embodiment is simple. Through the settings of the first light guide plate 110, the first light source 120, the second light guide plate 130, the second light source 140, and the privacy film 150, the first micro-structure 300 is provided on the second light guide plate 130. By utilizing the scattering effect of the first micro-structure 300 on the light, people in the large viewing angle position can also view the display screen. The user can selectively turn on or off the second light source 140 according to needs, thereby realizing autonomous anti-peeping, enabling the user to freely switch between the anti-peeping mode and the sharing mode, with simple and convenient operation and improved user experience. At the same time, in this embodiment, the first light source 120 is located at the side of the first light guide plate 110, and the second light source 140 is located at the side of the second light guide plate 130, which can reduce the thickness of the display screen and achieve the purpose of thinning the display screen.

[0122] Exemplarily, in this embodiment, when the display screen is in the anti-peeping mode, the angle between the light emitted through the privacy film 150 and the third direction is ±20°, and the third direction is the direction perpendicular to the upper surface of the display module 200. The researchers combined with the visual range of the human eye and showed through experiments that within the above angle range, the observer directly in front of the display screen can observe the complete display screen, while observers in other directions are difficult to observe the display screen, and the display screen has a good anti-peeping effect. When the angle is greater than 45°, not only the observer directly in front can observe the display screen, but also observers in other viewing angles can observe the display screen, thereby affecting the anti-peeping effect. When the angle is less than 15°, the viewing angle of the observer directly in front of the display screen will also be limited.

[0123] As Figure 20 and Figure 22 shown, Figure 20It is the finite element analysis simulation field diagram of the display screen in the anti-peeking mode. Figure 22 It is the finite element analysis simulation field diagram of the display screen in the sharing mode. From Figure 20 and Figure 22 it can be known that: when the display screen is in the anti-peeking mode, there is no brightness on the left side (corresponding to the driver's direction), and there is brightness in the center (corresponding to the co-driver's direction), indicating that the picture can only be viewed by the co-driver; when the display screen is in the sharing mode, there is brightness on both the left side (corresponding to the driver's direction) and the center (corresponding to the co-driver's direction), indicating that the picture can be viewed by both the co-driver and the driver.

[0124] Embodiment Seven

[0125] As Figures 23 - 24 shown, the main difference between the display screen provided in this embodiment and that in Embodiment Six is that: two second light sources 140 are respectively arranged on two opposite side surfaces of the second light guide plate 130 of the display screen in this embodiment. That is to say, bilateral light sources are arranged on both sides of the second light guide plate 130 in this embodiment. Such an arrangement is beneficial to further improving the uniformity of light in the second light guide plate 130. Especially when the first microstructures 300 on the second light guide plate 130 are evenly arranged, arranging bilateral light sources can make the light in the second light guide plate 130 evenly distributed, thereby providing a good display effect for users and reducing the phenomenon of dark areas. Among them, Figure 24 It is the finite element analysis simulation field diagram of the display screen with bilateral light sources in the sharing mode.

[0126] In addition, through the arrangement of bilateral light sources, the display screen also has the technical effect of bilateral anti-peeking.

[0127] Specifically, when the second light sources 140 on both opposite sides of the second light guide plate 130 are both turned off, the display screen is in the anti-peeking mode at this time; when the second light source 140 on the left side is turned on, the personnel on the right side of the display screen can share the display screen information at this time, while the personnel on the left side of the display screen cannot view the display screen information, thus realizing the effect of sharing on the right side and anti-peeking on the left side; when the second light source 140 on the right side is turned on, the personnel on the left side of the display screen can share the display screen information at this time, while the personnel on the right side of the display screen cannot view the display screen information, thus realizing the effect of sharing on the left side and anti-peeking on the right side.

[0128] The remaining structures of the display screen in this embodiment are the same as those in Embodiment Six, and will not be elaborated here one by one.

[0129] Obviously, the above are only the preferred embodiments of the present utility model and the applied technical principles. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

[0130] Note that in the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A light guide plate, characterized in that: include: A body is provided with a first microstructure (300), the first microstructure (300) having a first surface (310) and a second surface (320), the first surface (310) and the second surface (320) being connected to form an edge line (330), the edge line (330) extending along the arrangement direction of the light source; the first surface (310) is arranged away from the light source, the second surface (320) is arranged toward the light source, the first surface (310) is a plane, and the second surface (320) is a curved surface.

2. The light guide plate according to claim 1, characterized in that: The first microstructure (300) is arranged in plurality; and in a direction gradually moving away from the light source, the width of the first microstructure (300) increases successively, and the height of the first microstructure (300) increases successively.

3. The light guide plate according to claim 1, characterized in that: The included angle α between the first surface (310) and the horizontal plane is not greater than 90°, and the included angle β between the second surface (320) and the horizontal plane is not greater than 90°.

4. The light guide plate according to claim 1, characterized in that: The radius of the circle where the arc surface is located is set to 40um to 80um.

5. The light guide plate according to claim 1, characterized in that: The first microstructure (300) is located on the upper surface and / or the lower surface of the body.

6. The light guide plate according to claim 1, characterized in that: The first microstructure (300) is provided in plurality, and the plurality of first microstructures (300) are arranged at equal intervals, continuously or randomly.

7. The light guide plate according to claim 1, characterized in that: The upper surface and / or the lower surface of the body is provided with a second microstructure (400), and the second microstructure (400) is concave or convex; The second microstructure (400) is integrally formed with the body; or a film layer is attached to the body, and the second microstructure (400) is arranged on the film layer.

8. The light guide plate according to claim 7, characterized in that: The second microstructure (400) is an arc-shaped structure or a polygonal structure.

9. The light guide plate according to any one of claims 1 to 8, characterized in that: A third microstructure (500) is arranged on the side of the body close to the light source, and the third microstructure (500) is an arc-shaped structure or a polygonal structure.

10. A backlight module, characterized in that: The backlight module (100) comprises a first light guide plate (110), a first light source (120), a second light guide plate (130), a second light source (140) and an anti-peep film (150), wherein the first light source (120) is arranged on a side of the first light guide plate (110), and the second light source (140) is arranged on a side of the second light guide plate (130); the second light guide plate (130) is the light guide plate described in any one of claims 1 to 9; and the anti-peep film (150) is arranged between the first light guide plate (110) and the second light guide plate (130).

11. The backlight module according to claim 10, characterized in that: The backlight module (100) further comprises a reflective film (190), wherein the reflective film (190) is arranged on a side of the first light guide plate (110) away from the anti-peep film (150); And / or, the backlight module (100) further comprises a diffusion film (180), and the diffusion film (180) is arranged between the first light guide plate (110) and the anti-peep film (150); And / or, the backlight module (100) further comprises a prism film (160), wherein the prism film (160) is arranged between the diffusion film (180) and the anti-peep film (150).

12. The backlight module according to claim 11, characterized in that: The backlight module (100) further includes a lenticular film (170), the upper surface and / or the lower surface of the lenticular film (170) being provided with a fourth microstructure (600), the fourth microstructure (600) being an arc-shaped structure or a polygonal structure, and the lenticular film (170) being provided on a side of the second light guide plate (130) facing away from the anti-peep film (150).

13. A display screen, characterized in that The display screen comprises a display module (200) and a backlight module (100) according to any one of claims 10 to 12.

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