Light source module and display device

Abstract

To provide a light source module and a display device.SOLUTION: A light source module includes a light guide plate, a first light source, and a plurality of optical fine structures. The light guide plate includes a first light incident surface and a first surface that are connected. The first light source is installed on a first light incident surface side of the light guide plate, and is suitable for emitting first light fluxes toward the first light incident surface. The first light fluxes enter the light guide plate through the first light incident surface. The plurality of optical fine structures are installed on the first surface, and include a first optical surface facing the first light source respectively, and a first structure surface and a second structure surface connected to the first optical surface and opposed to each other. There is a first included angle between the first optical surface and the first surface. The first included angle of each optical fine structure gradually changes as it gets away from the first surface. The first structure surface and the second structure surface of each optical fine structure are perpendicular to the first light incident surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to light source and display technologies, and particularly to a light source module and a display device.

Background Art

[0002] In order to meet the need for preventing peeping of a display device, a technique of installing an anti-peeping front light panel on the display surface of a display panel has been proposed. The anti-peeping front light panel is provided with a plurality of optical microstructures on the side closer to the display panel, and these optical microstructures can guide the light beam provided by the edge light as interference light to a space other than the user, so that a bystander cannot clearly see the screen of the display panel. However, such a technique may cause interference in the lateral viewing angle in the non-anti-peeping direction, which may affect the display operation of the user.

[0003] Note that since this "Background Art" part is only for helping the understanding of the content of the present invention, the content disclosed in this "Background Art" part may include technologies not known to those skilled in the art. Therefore, the content disclosed in this "Background Art" part does not mean that the content, or the problems to be solved by one or more embodiments of the present invention, were already well-known to those skilled in the art before the filing of the present invention.

Summary of the Invention

Problems to be Solved by the Invention

[0004] One object of the present invention is to provide a light source module with good transparency of a light guide plate and better light emission directivity.

[0005] Another object of the present invention is to provide a display device having excellent display quality in an anti-peeping mode.

[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

Means for Solving the Problem

[0007] To achieve one or some or all of the above objects or other objects, a light source module is provided in an embodiment of the present invention. The light source module includes a light guide plate, a first light source, and a plurality of optical microstructures. The light guide plate has a first light incident surface and a first surface to be connected. The first light source is installed on the side of the first light incident surface of the light guide plate and is suitable for emitting a plurality of first light beams toward the first light incident surface. These first light beams enter the light guide plate through the first light incident surface. The plurality of optical microstructures are installed on the first surface and each has a first optical surface facing the first light source, and a first structural surface and a second structural surface connected to the first optical surface and facing each other (opposite). There is a first included angle between the first optical surface and the first surface. The first included angle of each optical microstructure gradually changes (gradually varies) as it moves away from the first surface. The first structural surface and the second structural surface of each optical microstructure are perpendicular to the first light incident surface.

[0008] In order to achieve one or some or all of the above objects or other objects, in one embodiment of the present invention, a display device is provided. The display device includes a light source module and a display panel. The light source module includes a light guide plate, a first light source, and a plurality of optical microstructures. The light guide plate has a first light incident surface and a first surface that are connected. The first light source is installed on the side of the first light incident surface of the light guide plate and is suitable for emitting a plurality of first light beams toward the first light incident surface. These first light beams enter the light guide plate through the first light incident surface. The plurality of optical microstructures are installed on the first surface and each has a first optical surface facing the first light source, and a first structural surface and a second structural surface that are connected to the first optical surface and face each other. There is a first included angle between the first optical surface and the first surface. The first included angle of each optical microstructure gradually changes as it moves away from the first surface. The first structural surface and the second structural surface of each optical microstructure are perpendicular to the first light incident surface. The display panel is installed on the side of the first surface of the light guide plate and overlaps with the first surface. The plurality of first light beams propagating in the light guide plate are reflected by the plurality of first optical surfaces of these optical microstructures and then emitted from the second surface of the light guide plate. The second surface faces the first surface.

Advantages of the Invention

[0009] As described above, in the light source module and the display device according to one embodiment of the present invention, a plurality of optical microstructures are provided on the first surface of the light guide plate. These optical microstructures are each used for the first optical surface facing the first light source to guide the first light beam emitted from the first light source to the peep prevention region. The optical microstructure is further provided with a first structural surface and a second structural surface that are connected to the first optical surface and face each other, and both of these two structural surfaces are perpendicular to the first light incident surface of the light guide plate. Thereby, it is possible to avoid some of the first light beams being guided to the space outside the peep prevention region, which is advantageous for improving the display quality in the non-peep prevention region of the display device. In addition, the size of the optical microstructure can be reduced by installing the structural surface, so that the transparency of the light guide plate can be further improved.

[0010] Although the present invention has been disclosed as above through examples, they are not intended to limit the present invention, and those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended claims.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 3C

Figure 4

Figure 5A

Figure 5B

Figure 6

Figure 7A

Figure 7B

Figure 8

Modes for Carrying Out the Invention

[0012] The above-described and other technical contents, features, functions, and effects of the present invention will become clear from the following detailed description of preferred embodiments based on the attached drawings. Note that terms regarding directions mentioned in the following embodiments, such as up, down, left, right, front, rear, etc., are only in the directions of the attached drawings. Therefore, the terms of the directions used are only for explaining the present invention and not for limiting the present invention.

[0013] FIG. 1 is a front view of a display device according to an embodiment of the present invention. FIGS. 2A and 2B are side views of the display device of FIG. 1. FIGS. 3A to 3C are enlarged views of a local area of the light guide plate of FIG. 2A. FIG. 4 is an enlarged view of a local area of the light guide plate of FIG. 2B. FIGS. 5A and 5B are diagrams showing modified examples of the first structural surface and the second structural surface of FIG. 4.

[0014] Referring to FIGS. 1, 2A, and 2B, the display device 10 includes a light source module 100. The light source module 100 includes a light guide plate LGP, a first light source LS1, a second light source LS2, and a plurality of optical microstructures MS. The light guide plate LGP has a first surface S1, a second surface S2, a first light incident surface IS1, and a second light incident surface IS2. The first surface S1 faces the second surface S2. The first light incident surface IS1 and the second light incident surface IS2 are connected to the first surface S1 and the second surface S2 and face each other.

[0015] The first light source LS1 is installed on the side of the first light incident surface IS1 of the light guide plate LGP and is suitable for emitting a plurality of first light beams LB1 toward the first light incident surface IS1. These first light beams LB1 enter the light guide plate LGP through the first light incident surface IS1. The second light source LS2 is installed on the side of the second light incident surface IS2 of the light guide plate LGP and is suitable for emitting a plurality of second light beams LB2 toward the second light incident surface IS2. These second light beams LB2 enter the light guide plate LGP through the second light incident surface IS2.

[0016] The display device 10 further includes a display panel DP, which is installed on the side of the first surface S1 of the light guide plate LGP and overlaps with the first surface S1. Specifically, in this embodiment, the first surface S1 of the light guide plate LGP faces the display surface DS of the display panel DP and overlaps with the display surface DS along the normal direction of the display surface DS (for example, the Z direction). The side of the second surface S2 of the light guide plate LGP is the light-emitting side of the display device 10. In this embodiment, the display panel DP is, for example, a transmissive display panel, a reflective display panel, or a transflective display panel, but is not limited thereto. In other embodiments, the display panel DP generally refers to other types of displays used for display.

[0017] In this embodiment, the horizontal visual field of the user USR is distributed, for example, along the X direction, and the vertical visual field is distributed, for example, along the Y direction. Note that the first light incident surface IS1 of the light guide plate LGP is located on one side along the X direction of the light guide plate LGP, and the second light incident surface IS2 is located on the other side along the X direction of the light guide plate LGP.

[0018] Note that a plurality of optical microstructures MS corresponding to the first light source LS1 and the second light source LS2 are provided on the first surface S1 of the light guide plate LGP. These optical microstructures MS each have a first optical surface OS1 facing the first light source LS1 and a second optical surface OS2 facing the second light source LS2. A plurality of first light beams LB1 propagating in the light guide plate LGP can be reflected by the plurality of first optical surfaces OS1 of these optical microstructures MS and then pass through the second surface S2 and be emitted from the display device 10. A plurality of second light beams LB2 propagating in the light guide plate LGP can be reflected by the plurality of second optical surfaces OS2 of these optical microstructures MS and then pass through the second surface S2 and be emitted from the display device 10.

[0019] In this embodiment, the user USR can cause the display device 10 to operate by switching (on / off) the first light source LS1 and the second light source LS2 between the shared mode and the anti-peeping mode. Specifically, the display device 10 can provide an anti-peeping display effect to the user USR in the axial direction parallel to the X direction (i.e., the horizontal direction of the user USR).

[0020] For example, when the first light source LS1 and the second light source LS2 are turned on to emit a plurality of first light beams LB1 and a plurality of second light beams LB2, the plurality of optical microstructures MS on the light guide plate LGP direct the first light beam LB1 and the second light beam LB2 propagating through the light guide plate LGP to spaces other than the user USR, for example, to the positions where the onlooker OBR2 located on one side of the horizontal direction of the user USR and the onlooker OBR1 located on the other side of the horizontal direction are located in FIG. 2A respectively. Therefore, the onlooker OBR1 can see these second light beams LB2 emitted by the second light source LS2, and the onlooker OBR2 can see these first light beams LB1 emitted by the first light source LS1.

[0021] In this embodiment, the first light source LS1 and the second light source LS2 may be white light sources, but are not limited thereto. Regarding the onlookers OBR1 and OBR2, when the first light source LS1 and the second light source LS2 are turned on, the plurality of first light beams LB1 and the plurality of second light beams LB2 can form a bright white screen that overlaps with the display surface DS of the display panel DP. The brightness of this bright white screen may be higher than the display brightness of the video screen of the display panel DP. Therefore, after the video screen of the display panel DP is superimposed on this bright white screen, it cannot be clearly seen by the onlookers OBR1 and OBR2, so the anti-peeping effect can be achieved. Since the plurality of first light beams LB1 emitted from the first light source LS1 and the plurality of second light beams LB2 emitted from the second light source LS2 cannot be guided to the user USR, the user USR can still clearly see the video screen of the display panel DP.

[0022] Also, when the user USR attempts to make the display device 10 operate in the shared mode, the first light source LS1 and the second light source LS2 can be turned off. At this time, since the onlookers OBR1 and OBR2 are no longer affected by the interference of the bright white screen caused by the first light source LS1, the second light source LS2, and the plurality of optical microstructures MS on the light guide plate LGP, the video screen of the display panel DP can be clearly seen.

[0023] In addition, in this embodiment, the display device 10 may have a function of preventing one-sided viewing. For example, when the first light source LS1 is turned on and the second light source LS2 is turned off, only the onlooker OBR2 cannot clearly see the video screen of the display panel DP due to the interference of the bright white screen. That is, only the user USR and the onlooker OBR1 located on one side in the horizontal direction of the user USR can clearly see the video screen of the display panel DP. Conversely, when the first light source LS1 is turned off and the second light source LS2 is turned on, only the user USR and the onlooker OBR2 located on the other side in the horizontal direction of the user USR can clearly see the video screen of the display panel DP.

[0024] From another perspective, in other embodiments, only one light source (e.g., the first light source LS1 or the second light source LS2) in the light source module may be installed to satisfy the product design of preventing one-sided viewing. It should be noted that the arrangement and relative positional relationship among the plurality of optical microstructures MS in FIGS. 1, 2A, and 2B are merely illustrative and not intended for limitation, and there is not necessarily a direct correspondence between the views. Also, although not shown in FIG. 2A, as can be understood, the first light beam LB1 may be guided to the onlooker OBR1 after being reflected by the first optical surface OS1 of the optical microstructure MS, and the second light beam LB2 may be guided to the onlooker OBR2 after being reflected by the second optical surface OS2 of the optical microstructure MS. That is, which side of the user USR the light beam emitted from the first light source LS1 or the second light source LS2 is guided to after being reflected by the optical microstructure may be determined by adjusting the design of the optical surface of the optical microstructure, but the present invention is not limited thereto.

[0025] Furthermore, in this embodiment, the outer shapes (appearances) of the plurality of optical microstructures MS on the first surface S1 of the light guide plate LGP are substantially olive-shaped. Specifically, both the first included angle between the first optical surface OS1 and the first surface S1 of the optical microstructure MS and the second included angle between the second optical surface OS2 and the first surface S1 gradually change as they move away from the first surface S1.

[0026] As shown in FIGS. 3A to 3C, the first included angle (for example, the first included angle A1a, the first included angle A1b, or the first included angle A1c) between the first optical surface OS1 and the first surface S1 of the optical microstructure MS can gradually increase as it moves away from the first surface S1. Similarly, the second included angle (for example, the second included angle A2a, the second included angle A2b, or the second included angle A2c) between the second optical surface OS2 and the first surface S1 of the optical microstructure MS can gradually increase as it moves away from the first surface S1. It should be noted that the present invention is not limited to these. In other embodiments not shown, the first included angle and the second included angle of the optical microstructure may gradually decrease as they move away from the first surface.

[0027] Specifically, in this embodiment, the first optical surface OS1 is composed of a plurality of inclined surfaces with different slopes, and the second optical surface OS2 is also composed of a plurality of inclined surfaces with different slopes. It should be noted that the present invention is not limited to these. In other embodiments, the first optical surface may be composed of a plurality of curved surfaces with different curvatures, and the second optical surface may also be composed of a plurality of curved surfaces with different curvatures.

[0028] Referring also to FIG. 1, in this embodiment, the first surface S1 of the light guide plate LGP can be made to have a central region CZ, a first region Z1, and a second region Z2. The first region Z1 is installed between the central region CZ and the first light incident surface IS1 along the arrangement direction (for example, the X direction) of the first light incident surface IS1 and the second light incident surface IS2. The second region Z2 is installed between the central region CZ and the second light incident surface IS2 along the said arrangement direction. That is, the first region Z1 and the second region Z2 are installed on opposite sides along the X direction of the central region CZ, respectively.

[0029] In this embodiment, the plurality of optical microstructures MS include a plurality of first optical microstructures MS1 in the first region Z1, a plurality of second optical microstructures MS2 in the second region Z2, and a plurality of third optical microstructures MS3 in the central region CZ. The minimum difference between the first included angle A1c and the second included angle A2c of each third optical microstructure MS3 is smaller than the minimum difference between the first included angle A1a and the second included angle A2a of each first optical microstructure MS1 and the minimum difference between the first included angle A1b and the second included angle A2b of each second optical microstructure MS2.

[0030] In other words, compared with the cross-sectional profiles of the first optical surface OS1 and the second optical surface OS2 of each third optical microstructure MS3 located in the central region CZ, the cross-sectional profiles of the first optical surface OS1 and the second optical surface OS2 of each first optical microstructure MS1 located in the first region Z1 and the cross-sectional profiles of the first optical surface OS1 and the second optical surface OS2 of each second optical microstructure MS2 located in the second region Z2 are all relatively asymmetric.

[0031] For example, in this embodiment, the minimum difference between the first included angle A1c and the second included angle A2c of each third optical microstructure MS3 is 0. Specifically, the cross-sectional profiles of the first optical surface OS1 and the second optical surface OS2 of each third optical microstructure MS3 may be symmetrically distributed (as shown in FIG. 3B). The maximum value of the first included angle A1a of each first optical microstructure MS1 is smaller than the maximum value of the second included angle A2a (as shown in FIG. 3A). The maximum value of the second included angle A2b of each second optical microstructure MS2 is smaller than the maximum value of the first included angle A1b (as shown in FIG. 3C).

[0032] It should be noted that the maximum value of the aforementioned first included angle A1a refers to the angle value of the included angle with the largest angle among the plurality of first included angles A1a of a single first optical microstructure MS1. Similarly, the maximum value of the aforementioned second included angle A2a refers to the angle value of the included angle with the largest angle among the plurality of second included angles A2a of a single first optical microstructure MS1. The maximum value of the aforementioned first included angle A1b refers to the angle value of the included angle with the largest angle among the plurality of first included angles A1b of a single second optical microstructure MS2. The maximum value of the aforementioned second included angle A2b refers to the angle value of the included angle with the largest angle among the plurality of second included angles A2b of a single second optical microstructure MS2.

[0033] In other words, the change in the inclination of the first optical surface OS1 of each first optical microstructure MS1 when moving away from the first surface S1 is gentler than the change in the inclination of the second optical surface OS2 when moving away from the first surface S1, and the change in the inclination of the second optical surface OS2 of each second optical microstructure MS2 when moving away from the first surface S1 is gentler than the change in the inclination of the first optical surface OS1 when moving away from the first surface S1.

[0034] From another perspective, the maximum value of the first included angle A1a of each first optical microstructure MS1 is smaller than the maximum value of the first included angle A1b of each second optical microstructure MS2, and the maximum value of the second included angle A2b of each second optical microstructure MS2 is smaller than the maximum value of the second included angle A2a of each first optical microstructure MS1.

[0035] In this embodiment, the maximum value of the first included angle A1a of each first optical microstructure MS1 within the first region Z1 may gradually increase as the installation position moves away from the first light incident surface IS1, and the maximum value of the second included angle A2b of each second optical microstructure MS2 within the second region Z2 may gradually increase as the installation position moves away from the second light incident surface IS2. Alternatively, it can also be said as follows, that is, the minimum difference between the first included angle A1a and the second included angle A2a of each first optical microstructure MS1 gradually decreases as the installation position approaches the central region CZ, and the minimum difference between the first included angle A1b and the second included angle A2b of each second optical microstructure MS2 gradually decreases as the installation position approaches the central region CZ.

[0036] By causing the first included angle (i.e., the included angle between the first optical surface OS1 and the first surface S1) and the second included angle (i.e., the included angle between the second optical surface OS2 and the first surface S1) of the optical microstructure MS1 to vary gradually in the X direction, the light condensing property within the space of the onlookers OBR1 and OBR2 of the light beams emitted from the first light source LS1 and the second light source LS2 can be further enhanced. Therefore, when the display device 10 operates in the anti-peeping mode, it is advantageous for improving the anti-peeping effect on the onlookers OBR1 and OBR2. Also, the following can be avoided, that is, since a plurality of optical microstructures have the same first included angle and second included angle, the brightness of the screen seen by the user decreases, and the display effects on the left and right sides of the video screen are interfered with.

[0037] Furthermore, in order to suppress the influence on the display quality of the non-anti-peeping area (for example, the area where the user USR is located) caused by a part of the first light beam LB1 emitted from the first light source LS1 and a part of the second light beam LB2 emitted from the second light source LS2 being guided to the space outside the anti-peeping area (for example, the area where the onlookers OBR1 and OBR2 are located), the plurality of optical microstructures MS each further have a first structural surface SS1 and a second structural surface SS2 that are connected to the first optical surface OS1 and the second optical surface OS2 and face each other. Specifically, the first structural surface SS1 and the second structural surface SS2 are substantially installed on opposite sides of the optical microstructure MS along the Y direction.

[0038] Note that the first structural surface SS1 and the second structural surface SS2 of each optical microstructure MS are all perpendicular to the first light incident surface IS1 and the second light incident surface IS2 of the light guide plate LGP. From another perspective, the first structural surface SS1 and the second structural surface SS2 of the optical microstructure MS each have a first edge e1 and a second edge e2 that are connected to the first surface S1, and the first edge e1 and the second edge e2 may be perpendicular to the first light incident surface IS1 and the second light incident surface IS2 of the light guide plate LGP.

[0039] Referring to FIG. 4, in this embodiment, the first structural surface SS1 and the second structural surface SS2 of the optical microstructure MS each consist of one plane. There is a third included angle A3 between the first structural surface SS1 and the first surface S1. There is a fourth included angle A4 between the second structural surface SS2 and the first surface S1. Preferably, both the third included angle A3 and the fourth included angle A4 are less than 40 degrees.

[0040] However, the present invention is not limited thereto. In other embodiments, the third included angle and the fourth included angle of each optical microstructure may gradually change as they move away from the first surface S1. For example, in the modification of FIG. 5A, the light guide plate LGP-A is defined as follows. That is, the first structural surface SS1-A and the second structural surface SS2-A of the optical microstructure each consist of a plurality of planes FL, and the included angle (for example, the third included angle A3-A or the fourth included angle A4-A) between each plane FL and the first surface S1 can gradually increase as it moves away from the first surface S1. Among the plurality of planes FL, the included angle between the one closest to the first surface S1 and the first surface S1 may preferably be less than 40 degrees.

[0041] In another modification of FIG. 5B, the light guide plate LGP-B is defined as follows. That is, the first structural surface SS1-B and the second structural surface SS2-B of the optical microstructure each consist of a plurality of planes FL-B, and the included angle (for example, the third included angle A3-B or the fourth included angle A4-B) between each plane FL-B and the first surface S1 can gradually decrease as it moves away from the first surface S1. However, the present invention is not limited thereto. In other embodiments, the first structural surface may be composed of a plurality of curved surfaces having different curvatures, and the second structural surface may also be composed of a plurality of curved surfaces having different curvatures.

[0042] Continuing to refer to FIG. 1, by providing the first structural surface SS1 and the second structural surface SS2, a part of the surfaces distributed on opposite sides along the Y direction of the first optical surface OS1 and the second optical surface OS2 can be reduced. Therefore, after the first light beam LB1 and the second light beam LB2 are reflected by the part of the surfaces of the first optical surface OS1 and the second optical surface OS2, it is beneficial for reducing the light beams guided within the viewing angle ranges on opposite sides in the vertical direction (e.g., the Y direction) of the user USR (i.e., the upper and lower viewing angle ranges of the user USR).

[0043] In other words, by providing the first structural surface SS1 and the second structural surface SS2 on the optical microstructure MS, when the display device 10 operates in the anti-peeping mode, the display quality within the non-anti-peeping region (i.e., the region where the user USR is located) can be further improved. Also, since the size of the optical microstructure MS can be further reduced by providing the structural surfaces, the transparency of the light guide plate can be further improved.

[0044] Hereinafter, the present invention will be described in detail by giving several other embodiments. Among them, the same components are denoted by the same reference numerals, and the description of the same technical content is omitted. Also, for the omitted parts, reference can be made to the foregoing embodiments and will not be described hereinafter.

[0045] FIG. 6 is a diagram showing a light source module according to another embodiment of the present invention. FIGS. 7A and 7B are enlarged cross-sectional views of a local region of the light guide plate in FIG. 6. Referring to FIGS. 6, 7A, and 7B, different from the light guide plate LGP in FIG. 1, in this embodiment, the first surface S1 of the light guide plate LGP-C has a first region Z1-A and a second region Z2-A. Among them, the first region Z1-A is installed between the second region Z2-A and the first light incident surface IS1 along the arrangement direction of the first light incident surface IS1 and the second light incident surface IS2, and the second region Z2-A is installed between the first region Z1-A and the second light incident surface IS2 along the arrangement direction, and a part of the first region Z1-A may overlap with the second region Z2-A. The plurality of optical microstructures MS-A includes a plurality of first optical microstructures MS1-A and a plurality of second optical microstructures MS2-A, and the first region Z1-A and the second region Z2-A may be provided with the first optical microstructures MS1-A and the second optical microstructures MS2-A, respectively.

[0046] For example, in this embodiment, both the first region Z1-A and the second region Z2-A are installed at positions on the first surface S1 close to the first light source LS1. Therefore, the change in the inclination of each first optical surface OS1 of the first optical microstructure MS1-A and the second optical microstructure MS2-A when moving away from the first surface S1 is gentler than the change in the inclination of the second optical surface OS2 when moving away from the first surface S1. From another perspective, the maximum value of the first included angle A1a of each first optical microstructure MS1-A is smaller than the maximum value of the second included angle A2a (as shown in FIG. 7A), and the maximum value of the first included angle A1b′′ of each second optical microstructure MS2-A is smaller than the maximum value of the second included angle A2b′′ (as shown in FIG. 7B). Since the first optical microstructure MS1-A and the second optical microstructure MS2-A in this embodiment are similar to the first optical microstructure MS1 in FIG. 3A and the second optical microstructure MS2 in FIG. 3C, respectively, for the detailed description of the optical microstructure, reference can be made to the relevant paragraphs of the foregoing embodiments, and the detailed description thereof is omitted here.

[0047] In this embodiment, the distribution density in the first region Z1-A of the first optical microstructure MS1-A may be greater than the distribution density in the first region Z1-A of the second optical microstructure MS2-A. The distribution density in the second region Z2-A of the second optical microstructure MS2-A may be greater than the distribution density in the second region Z2-A of the first optical microstructure MS1-A. The distribution density in the overlapping portion Z1-2 of the first region Z1-A and the second region Z2-A of the first optical microstructure MS1-A may correspond to the distribution density in the overlapping portion Z1-2 of the first region Z1-A and the second region Z2-A of the second optical microstructure MS2-A. Thereby, the uniformity of the light beams emitted from the first light source LS1 and the second light source LS2 after being reflected by the plurality of optical microstructures MS-A of the light guide plate LGP-C can be significantly improved. Alternatively, it can also be said as follows, that is, when the display device operates in the anti-peeping mode, the overall uniformity of the bright white screen seen by bystanders can be improved, so the occlusion effect of the bright white screen generated by the light source module 100A on the display screen of the display panel can be further enhanced.

[0048] FIG. 8 is a front view of a light source module according to another embodiment of the present invention. Referring to FIG. 8, the difference between the light guide plate LGP-D of the light source module 100B according to this embodiment and the light guide plate LGP in FIG. 1 lies in that the design of the structural surface of the optical microstructure is different. Specifically, in this embodiment, the included angle θ between the virtual connection line VL between the geometric centers GC of the first edge e1 and the second edge e2 of each of the plurality of optical microstructures MS-B of the light guide plate LGP-D and the first light incident surface IS1 gradually changes as it moves away from the first light incident surface IS1.

[0049] For example, in this embodiment, the angle θ between the aforementioned virtual connection line VL of each optical microstructure MS-B and the first light incident surface IS1 gradually decreases as it moves away from the first light incident surface IS1 and the second light incident surface IS2, and the aforementioned virtual connection line VL of the optical microstructure MS-B located in the central region of the light guide plate LGP-D may be parallel to the first light incident surface IS1 and the second light incident surface IS2. Thereby, the occlusion effect on the display screen of the portion of the light source module 100B closer to the user side within the anti-peeping region can be further improved, and the interference caused by the light beam of the light source module 100B when the user views the video screen can be further reduced.

[0050] From the above, in the light source module and the display device according to an embodiment of the present invention, a plurality of optical microstructures are installed on the first surface of the light guide plate. These optical microstructures are each used for the first optical surface facing the first light source to guide the first light beam emitted from the first light source to the anti-peeping region. The optical microstructure is further provided with a first structural surface and a second structural surface that are connected to the first optical surface and face each other, and both of these two structural surfaces are perpendicular to the first light incident surface of the light guide plate. Thereby, the light source module and the display device according to an embodiment of the present invention have at least one of the following advantages, that is, it is possible to avoid some of the first light beams being guided to the space outside the anti-peeping region, which is advantageous for improving the display quality within the non-anti-peeping region of the display device. Also, since the size of the optical microstructure can be reduced by the installation of the structural surface, the transparency of the light guide plate can be further improved.

[0051] Although the present invention has been disclosed as above based on the foregoing preferred embodiments, the foregoing preferred embodiments are not for limiting the present invention. Those skilled in the art can make minor changes and refinements to the present invention without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is based on what is defined in the appended claims. Also, any embodiment or claim of the present invention does not need to achieve all the objectives or advantages or features disclosed in the present invention. Further, a part of the abstract and the name of the invention are only for assisting in literature search and do not limit the scope of rights of the present invention. Also, the terms such as "first", "second", etc. mentioned in this specification or claims are only for naming elements or for distinguishing different embodiments or scopes, and are not for limiting the upper or lower limits of the quantity of elements.

Explanation of Reference Numerals

[0052] 10: Display device 100, 100A, 100B: Light source module A1a, A2a, A1b, A2b, A1b′′, A2b′′, A1c, A2c, A3, A4, A3-A, A4-A, A3-B, A4-B, θ: Included angle CZ: Central region DP: Display panel DS: Display surface e1: First edge e2: Second edge FL, FL-B: Plane GC: Geometric center IS1: First light incident surface IS2: Second light incident surface LB1: First light beam LB2: Second light beam LGP, LGP-A, LGP-B, LGP-C, LGP-D: Light guide plate LS1: First light source LS2: Second light source MS, MS-A, MS-B, MS1, MS2, MS3, MS1-A, MS2-A: Optical microstructure OBR1, OBR2: Bystanders OS1: First optical surface OS2: Second optical surface S1: First surface S2: Second surface SS1, SS1-A, SS1-B: First structural surface SS2, SS2-A, SS2-B: Second structural surface USR: User VL: Virtual connection line X, Y, Z: Directions Z1, Z1-A: First region Z2, Z2-A: Second region Z1-2: Overlap part

Claims

1. A light source module, comprising: a light guide plate, a first light source, and a plurality of optical microstructures; the light guide plate has a first light input surface and a first surface connected thereto; the first light source is disposed on a side of the first light incident surface of the light guide plate and is adapted to emit a plurality of first light beams toward the first light incident surface, the plurality of first light beams entering the light guide plate via the first light incident surface; The plurality of optical microstructures are disposed on the first surface, and each of the plurality of optical microstructures has a first optical surface facing the first light source, and a first structure surface and a second structure surface connected to the first optical surface and facing each other; a first included angle between the first optical surface and the first surface, the first included angle of each of the plurality of optical microstructures gradually changing away from the first surface, and the first structured surface and the second structured surface of each of the plurality of optical microstructures are perpendicular to the first light input surface.

2. 2. The light source module according to claim 1, a third included angle between the first structured surface and the first surface, a fourth included angle between the second structured surface and the first surface, and the third included angle and the fourth included angle of each of the plurality of optical microstructures gradually change with distance from the first surface.

3. 2. The light source module according to claim 1, a light source module, wherein each of the first structure surface and the second structure surface of the plurality of optical microstructures is composed of at least one plane, and an included angle between one of the at least one planes closest to the first surface and the first surface is less than 40 degrees.

4. 4. The light source module according to claim 3, The at least one plane is a plurality of planes, and an included angle between each of the plurality of planes and the first surface varies gradually with distance from the first surface.

5. 2. The light source module according to claim 1, Further comprising a second light source; the second light source is disposed on a side of a second light incident surface of the light guide plate, the second light incident surface is connected to the first surface and faces the first light incident surface, the second light source is suitable for emitting a plurality of second light beams toward the second light incident surface, and the plurality of second light beams enter the light guide plate via the second light incident surface; each of the plurality of optical microstructures further has a second optical surface facing the second light source, the second optical surface being connected to the first structure surface and the second structure surface and facing the first optical surface, a second included angle exists between the second optical surface of each of the plurality of optical microstructures and the first surface, and the second included angle of each of the plurality of optical microstructures gradually changes with distance from the first surface.

6. 6. The light source module according to claim 5, the light guide plate further has a central region, a first region, and a second region, the first region is disposed between the central region and the first light incident surface along an arrangement direction of the first light incident surface and the second light incident surface, the second region is disposed between the central region and the second light incident surface along the arrangement direction, the plurality of optical microstructures include a plurality of first optical microstructures in the first region, a plurality of second optical microstructures in the second region, and a plurality of third optical microstructures in the central region, and a minimum difference between the first included angle and the second included angle of each of the plurality of third optical microstructures is smaller than a minimum difference between the first included angle and the second included angle of each of the plurality of first optical microstructures and a minimum difference between the first included angle and the second included angle of each of the plurality of second optical microstructures.

7. 7. The light source module according to claim 6, the minimum differences between the first included angle and the second included angle of each of the plurality of third optical microstructures are all zero.

8. 6. The light source module according to claim 5, the light guide plate further has a first region and a second region, the first region is disposed between the second region and the first light incident surface along an arrangement direction of the first light incident surface and the second light incident surface, the second region is disposed between the first region and the second light incident surface along the arrangement direction, the plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, a maximum value of the first included angle of each of the plurality of first optical microstructures is smaller than a maximum value of the first included angle of each of the plurality of second optical microstructures, a maximum value of the second included angle of each of the plurality of second optical microstructures is smaller than a maximum value of the second included angle of each of the plurality of first optical microstructures, a distribution density of the plurality of first optical microstructures in the first region is greater than a distribution density of the plurality of second optical microstructures in the first region, and a distribution density of the plurality of second optical microstructures in the second region is greater than a distribution density of the plurality of first optical microstructures in the second region.

9. 6. The light source module according to claim 5, the light source module, wherein the light guide plate further has a first region and a second region, the first region is disposed between the second region and the first light incident surface along an arrangement direction of the first light incident surface and the second light incident surface, the second region is disposed between the first region and the second light incident surface along the arrangement direction, the plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, the plurality of first optical microstructures are in the first region and the plurality of second optical microstructures are in the second region, a maximum value of the first included angle of each of the plurality of first optical microstructures is smaller than a maximum value of the second included angle of each of the plurality of first optical microstructures, and a maximum value of the second included angle of each of the plurality of second optical microstructures is smaller than a maximum value of the first included angle of each of the plurality of second optical microstructures.

10. 2. The light source module according to claim 1, a first structure surface and a second structure surface of each of the plurality of optical microstructures respectively having a first edge and a second edge connected to the first surface, and an included angle between an imaginary connecting line between a geometric center of the first edge and a geometric center of the second edge and the first light incident surface gradually changes with increasing distance from the first light incident surface.

11. A display device, comprising: The display device includes a light source module and a display panel, The light source module includes a light guide plate, a first light source, and a plurality of optical microstructures; the light guide plate has a first light input surface and a first surface connected thereto; the first light source is disposed on a side of the first light incident surface of the light guide plate and is adapted to emit a plurality of first light beams toward the first light incident surface, the plurality of first light beams entering the light guide plate via the first light incident surface; The plurality of optical microstructures are disposed on the first surface, and each of the plurality of optical microstructures has a first optical surface facing the first light source, and a first structure surface and a second structure surface connected to the first optical surface and facing each other; a first included angle between the first optical surface and the first surface, the first included angle of each of the plurality of optical microstructures varying away from the first surface, and the first structured surface and the second structured surface of each of the plurality of optical microstructures are perpendicular to the first light input surface; the display panel is disposed on the first surface side of the light guide plate and overlaps the first surface; the first light beams propagating within the light guide plate are reflected by the first optical surfaces of the optical microstructures and then exit from a second surface of the light guide plate, the second surface being opposite to the first surface.

12. The display device according to claim 11, a third included angle between the first structured surface and the first surface, a fourth included angle between the second structured surface and the first surface, and the third included angle and the fourth included angle of each of the plurality of optical microstructures gradually change with distance from the first surface.

13. The display device according to claim 11, A display device, wherein each of the first structure surface and the second structure surface of the plurality of optical microstructures is composed of at least one plane, and an included angle between one of the at least one planes closest to the first surface and the first surface is less than 40 degrees.

14. The display device according to claim 13, The at least one plane is a plurality of planes, and an included angle between each of the plurality of planes and the first surface varies gradually with distance from the first surface.

15. The display device according to claim 11, Further comprising a second light source; the second light source is disposed on a side of a second light incident surface of the light guide plate, the second light incident surface is connected to the first surface and faces the first light incident surface, the second light source is suitable for emitting a plurality of second light beams toward the second light incident surface, and the plurality of second light beams enter the light guide plate via the second light incident surface; each of the plurality of optical microstructures further has a second optical surface facing the second light source, the second optical surface being connected to the first structure surface and the second structure surface and facing the first optical surface, a second included angle exists between the second optical surface of each of the plurality of optical microstructures and the first surface, and the second included angle of each of the plurality of optical microstructures gradually changes with distance from the first surface.

16. The display device according to claim 15, the light guide plate further has a central region, a first region, and a second region, the first region is disposed between the central region and the first light incident surface along an arrangement direction of the first light incident surface and the second light incident surface, the second region is disposed between the central region and the second light incident surface along the arrangement direction, the plurality of optical microstructures include a plurality of first optical microstructures in the first region, a plurality of second optical microstructures in the second region, and a plurality of third optical microstructures in the central region, and a minimum difference between the first included angle and the second included angle of each of the plurality of third optical microstructures is smaller than a minimum difference between the first included angle and the second included angle of each of the plurality of first optical microstructures and a minimum difference between the first included angle and the second included angle of each of the plurality of second optical microstructures.

17. The display device according to claim 16, the minimum differences between the first included angle and the second included angle of each of the plurality of third optical microstructures are all zero.

18. The display device according to claim 15, the light guide plate further has a first region and a second region, the first region is disposed between the second region and the first light incident surface along an arrangement direction of the first light incident surface and the second light incident surface, the second region is disposed between the first region and the second light incident surface along the arrangement direction, the plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, a maximum value of the first included angle of each of the plurality of first optical microstructures is smaller than a maximum value of the first included angle of each of the plurality of second optical microstructures, a maximum value of the second included angle of each of the plurality of second optical microstructures is smaller than a maximum value of the second included angle of each of the plurality of first optical microstructures, a distribution density of the plurality of first optical microstructures in the first region is greater than a distribution density of the plurality of second optical microstructures in the first region, and a distribution density of the plurality of second optical microstructures in the second region is greater than a distribution density of the plurality of first optical microstructures in the second region.

19. The display device according to claim 15, the light guide plate further has a first region and a second region, the first region is disposed between the second region and the first light incident surface along an arrangement direction of the first light incident surface and the second light incident surface, the second region is disposed between the first region and the second light incident surface along the arrangement direction, the plurality of optical microstructures include a plurality of first optical microstructures and a plurality of second optical microstructures, the plurality of first optical microstructures are in the first region and the plurality of second optical microstructures are in the second region, a maximum value of the first included angle of each of the plurality of first optical microstructures is smaller than a maximum value of the second included angle of each of the plurality of first optical microstructures, and a maximum value of the second included angle of each of the plurality of second optical microstructures is smaller than a maximum value of the first included angle of each of the plurality of second optical microstructures.

20. The display device according to claim 11, a first structure surface and a second structure surface of each of the plurality of optical microstructures each having a first edge and a second edge connected to the first surface, respectively, and an included angle between an imaginary connecting line between a geometric center of the first edge and a geometric center of the second edge and the first light incident surface gradually changes with increasing distance from the first light incident surface.

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