Light source module

Abstract

A light source module includes a light guide plate, a first light source, a second light source, a plurality of first optical microstructures, and a plurality of second optical microstructures. The light guide plate has a first light-incident surface and a bottom surface. At least one first groove is disposed on the first light-incident surface and includes a first inclined surface and a second inclined surface. Each of the plurality of first optical microstructures disposed on the bottom surface has a first patterned reflective surface facing the first light-incident surface. The perpendicular bisector of the first patterned reflective surface connecting to a first edge of the bottom surface extends perpendicularly to the first light-emitting surface of the first light source facing the first inclined surface. Each of the plurality of second optical microstructures disposed on the bottom surface has a second patterned reflective surface facing the first light-incident surface. The perpendicular bisector of the second patterned reflective surface connecting to a second edge of the bottom surface extends perpendicularly to the second light-emitting surface of the second light source facing the second inclined surface.

Description

Technical Field

[0001] This invention relates to an optical module, and more particularly to a light source module. Prior Technology

[0002] With advancements in lighting technology, in addition to standard lamps providing illumination, decorative lighting panels have emerged on the market. These panels incorporate optical microstructures on the bottom surface of a light guide plate, with the positions of these microstructures and the angles of their reflective surfaces configured according to the desired effect. Light emitted from the light source enters through the side (light-incident surface) of the light guide plate and is reflected by the optical microstructures, then transmitted and emitted towards the light-emitting surface, allowing users to view patterns or text formed by light from one side of the light-emitting surface.

[0003] To enable lighting panels to display richer and more vivid images, a technique has been proposed that involves setting point light sources on multiple light-incident sides of a light guide plate and correspondingly setting different optical microstructures. By independently switching these point light sources located on different light-incident sides, the lighting panel can switch between displaying different images. However, the use of point light sources limits the size of the displayed pattern and causes the display brightness to be relatively low. On the other hand, setting light sources on multiple light-incident sides increases the number of light panels, leading to an increase in the overall manufacturing cost of the lighting panel.

[0004] The "Prior Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Prior Art" paragraph may include some prior art that is not known to those skilled in the art. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of this invention was known or recognized by those skilled in the art prior to this application. Summary of the Invention

[0005] This invention provides a light source module that can switch between displaying multiple images and has cost advantages.

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

[0007] To achieve one, some, or all of the above objectives, or other objectives, an embodiment of the present invention provides a light source module. The light source module includes a light guide plate, a first light source, a second light source, a plurality of first optical microstructures, and a plurality of second optical microstructures. The light guide plate has a first light-incident surface and a bottom surface connected to the first light-incident surface. The first light-incident surface has at least one first groove, and the at least one first groove includes a first inclined surface and a second inclined surface. The first light source is disposed on one side of the first light-incident surface of the light guide plate and has a first light-emitting surface facing the first inclined surface. The second light source is disposed on one side of the first light-incident surface of the light guide plate and has a second light-emitting surface facing the second inclined surface. The plurality of first optical microstructures are disposed on the bottom surface of the light guide plate, and each has a first patterned reflective surface facing the first light-incident surface. The first patterned reflective surface has a first edge connected to the bottom surface, and the extension direction of the perpendicular bisector of the first edge is perpendicular to the first light-emitting surface of the first light source. The plurality of second optical microstructures are disposed on the bottom surface of the light guide plate, and each has a second patterned reflective surface facing the first light-incident surface. The second patterned reflective surface has a second edge that connects to the bottom surface, and the direction of the extension of the perpendicular line of the second edge is perpendicular to the second light-emitting surface of the second light source.

[0008] In one embodiment of the present invention, the first inclined surface and the second inclined surface of the light source module define a first groove with at least one first recess. The included angle between the first inclined surface and the second inclined surface is greater than or equal to 70 degrees and less than or equal to 110 degrees.

[0009] In one embodiment of the present invention, the light source module further includes an auxiliary light source and a plurality of auxiliary optical microstructures. The auxiliary light source is disposed on one side of the first light-incident surface of the light guide plate. The first light-incident surface is also provided with an auxiliary groove. The light guide plate also has an auxiliary inclined surface defining the auxiliary groove, and the auxiliary inclined surface is not parallel to the first inclined surface. The auxiliary light source has an auxiliary light-emitting surface facing the auxiliary inclined surface. A plurality of auxiliary optical microstructures are disposed on the bottom surface of the light guide plate, and each has an auxiliary pattern reflective surface facing the first light-incident surface. The auxiliary pattern reflective surface has an auxiliary edge connecting to the bottom surface. The angle between the extension direction of the perpendicular bisector of the auxiliary edge and the normal direction of the auxiliary light-emitting surface is greater than 0 degrees and less than or equal to 20 degrees.

[0010] In one embodiment of the present invention, the angle between the first inclined surface and the auxiliary inclined surface of the light source module is greater than or equal to 20 degrees and less than or equal to 30 degrees.

[0011] In one embodiment of the present invention, the light source module further includes a third light source and a plurality of third optical microstructures. The third light source is disposed on one side of the second light-incident surface of the light guide plate. The second light-incident surface is opposite to the first light-incident surface and has a second groove. The light guide plate also has a third inclined surface defining the second groove, and the third light source has a third light-emitting surface facing the third inclined surface. A plurality of third optical microstructures are disposed on the bottom surface of the light guide plate, and each has a third patterned reflective surface facing the second light-incident surface. The third patterned reflective surface has a third edge connecting to the bottom surface, and the extension direction of the perpendicular bisector of the third edge is perpendicular to the third light-emitting surface of the third light source.

[0012] In one embodiment of the present invention, each of the plurality of first optical microstructures of the light source module further comprises a first off-axis reflecting surface facing the second light-incident surface. A first patterned reflecting angle is formed between the first patterned reflecting surface and the virtual extension surface of the bottom surface. A first off-axis reflecting angle is formed between the first off-axis reflecting surface and the virtual extension surface of the bottom surface. Each of the plurality of second optical microstructures further comprises a second off-axis reflecting surface facing the second light-incident surface. A second patterned reflecting angle is formed between the second patterned reflecting surface and the virtual extension surface of the bottom surface. A second off-axis reflecting angle is formed between the second off-axis reflecting surface and the virtual extension surface of the bottom surface. Each of the plurality of third optical microstructures further comprises a third off-axis reflecting surface facing the first light-incident surface. A third patterned reflecting angle is formed between the third patterned reflecting surface and the virtual extension surface of the bottom surface. A third off-axis reflecting angle is formed between the third off-axis reflecting surface and the virtual extension surface of the bottom surface. The first patterned reflecting angle is greater than the first off-axis reflecting angle. The second patterned reflecting angle is greater than the second off-axis reflecting angle. The third patterned reflecting angle is greater than the third off-axis reflecting angle.

[0013] In one embodiment of the present invention, the first pattern reflection angle, the second pattern reflection angle and the third pattern reflection angle of the light source module are greater than or equal to 45 degrees and less than or equal to 65 degrees, and the first off-axis reflection angle, the second off-axis reflection angle and the third off-axis reflection angle are greater than or equal to 5 degrees and less than or equal to 25 degrees.

[0014] In one embodiment of the present invention, the above-mentioned light source module further includes a fourth light source and a plurality of fourth optical microstructures. The fourth light source is disposed on one side of the second light-incident surface of the light guide plate. The light guide plate also has a fourth inclined surface defining a second groove, and the fourth light source has a fourth light-emitting surface facing the fourth inclined surface. A plurality of fourth optical microstructures are disposed on the bottom surface of the light guide plate, and each has a fourth patterned reflective surface facing the second light-incident surface and a fourth off-axis reflective surface facing the first light-incident surface. The fourth patterned reflective surface has a fourth edge connecting to the bottom surface. The perpendicular bisector of the fourth edge extends perpendicularly to the fourth light-emitting surface of the fourth light source. A fourth patterned reflection angle exists between the fourth patterned reflective surface and the virtual extension surface of the bottom surface. A fourth off-axis reflection angle exists between the fourth off-axis reflective surface and the virtual extension surface of the bottom surface. The fourth patterned reflection angle is greater than the fourth off-axis reflection angle.

[0015] In one embodiment of the present invention, the fourth pattern reflection angle of the above-mentioned light source module is greater than or equal to 45 degrees and less than or equal to 65 degrees, and the fourth off-axis reflection angle is greater than or equal to 5 degrees and less than or equal to 25 degrees.

[0016] In one embodiment of the present invention, the light source module further includes a light-shielding layer disposed within at least one first groove. The light-shielding layer overlaps the first light source in a direction parallel to the first light-emitting surface, or overlaps the second light source in another direction parallel to the second light-emitting surface.

[0017] In one embodiment of the present invention, the light guide plate of the light source module further has a cavity recessed from the first inclined surface. In a direction parallel to the second light-emitting surface, the cavity overlaps with the second light source but does not overlap with the first light source.

[0018] In one embodiment of the present invention, the light guide plate of the light source module described above also has a folded surface that defines the cavity, and the folded surface connects the first inclined surface and the second inclined surface.

[0019] In one embodiment of the present invention, the orthographic projection profile of the folded surface of the light source module on the bottom surface is stepped.

[0020] In one embodiment of the present invention, the light guide plate of the light source module also has an optical surface relative to the first light incident surface, and a plurality of light-scattering microstructures are provided on the optical surface.

[0021] Based on the above, in a light source module according to an embodiment of the present invention, a light guide plate has a groove on one light-incident side, and two light sources with different light-emitting directions are arranged in the groove. Multiple optical microstructures corresponding to different light sources are provided on the bottom surface of the light guide plate, and the extension direction of the perpendicular bisector of the edge connecting each optical microstructure to the bottom surface is perpendicular to the light-emitting surface of the corresponding light source. The two images formed by these optical microstructures can be switched and displayed by switching on and off different light sources. Since the two light sources with different light-emitting directions are arranged on the same light-incident side of the light guide plate, the overall layout space required for the light source can be significantly reduced, and the manufacturing cost of the light source module can also be reduced. On the other hand, different light sources have different light-emitting surfaces, so that the distribution range of the optical microstructures is no longer limited by the light-emitting range of the corresponding light source, which helps to increase the image size that the light source module can present.

[0022] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation. Simple Explanation of the Diagram

[0023] Figure 1 is a top view schematic diagram of a light source module according to a first embodiment of the present invention. Figure 2 is a cross-sectional schematic diagram of the light guide plate in Figure 1. Figures 3A and 3B are enlarged schematic diagrams of two local areas of the light source module in Figure 1. Figures 4A and 4B are bottom views of some other variations of the optical microstructure in Figure 1. Figure 5 is a top view schematic diagram of the light source module according to the second embodiment of the present invention. Figures 6A to 6E are enlarged schematic diagrams of five local areas of the light source module in Figure 5. Figures 7A to 7C are cross-sectional schematic diagrams of the light source module in Figure 5. Figures 8A and 8B are bottom views of some other variations of the optical microstructure in Figure 5. Figure 9 is a cross-sectional schematic diagram of a light source module according to a third embodiment of the present invention. Figure 10 is a cross-sectional schematic diagram of a light source module according to a fourth embodiment of the present invention. Figure 11 is a cross-sectional schematic diagram of a light source module according to a fifth embodiment of the present invention. Figure 12 is a top view schematic diagram of a light source module according to the sixth embodiment of the present invention. Implementation

[0024] The foregoing descriptions and other technical contents, features, and effects of this invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0025] Figure 1 is a top view of the light source module according to the first embodiment of the present invention. Figure 2 is a cross-sectional view of the light guide plate of Figure 1. Figures 3A and 3B are enlarged views of two partial regions of the light source module of Figure 1. Figures 4A and 4B are bottom views of other modified embodiments of the optical microstructure of Figure 1. Figures 3A and 3B correspond to regions Z1 and Z2 of Figure 1, respectively.

[0026] Referring to Figures 1 and 2, the light source module 10 includes a light guide plate 100, multiple light sources LS1 (defined as first light sources), and multiple light sources LS2 (defined as second light sources). The light guide plate 100 has a light incident surface 100is1 (defined as a first light incident surface), and the light incident surface 100is1 is provided with multiple grooves GV1 (defined as first grooves). Each groove GV1 may include a slope IS1 (defined as a first slope) and a slope IS2 (defined as a second slope). More specifically, the light guide plate 100 also has slopes IS1 and IS2 that define each groove GV1 and are connected to each other. Preferably, the included angle α between slopes IS1 and IS2 can be greater than or equal to 70 degrees and less than or equal to 110 degrees. In this embodiment, the number of grooves GV1 is illustrated by example as three, and does not imply that the invention is limited thereto. In other embodiments, the number of grooves GV1 can be adjusted according to actual needs.

[0027] In this embodiment, multiple light sources LS1 and multiple light sources LS2 are all disposed on one side of the light incident surface 100is1 of the light guide plate 100, and each groove GV1 may contain one light source LS1 and one light source LS2, but the present invention is not limited thereto. In other embodiments, some grooves GV1 may contain only one light source LS1 or one light source LS2. In this embodiment, the light sources LS1 and LS2 in each groove GV1 are respectively disposed corresponding to the inclined surfaces IS1 and IS2.

[0028] More specifically, light source LS1 has a light-emitting surface LS1es (defined as the first light-emitting surface) facing the inclined plane IS1, while light source LS2 has a light-emitting surface LS2es (defined as the second light-emitting surface) facing the inclined plane IS2. The light-emitting surface LS1es of light source LS1 is approximately parallel to the inclined plane IS1. The light-emitting surface LS2es of light source LS2 is approximately parallel to the inclined plane IS2. That is, the angle between the light-emitting surface LS1es of light source LS1 and the light-emitting surface LS2es of light source LS2 is approximately equal to the angle α between the inclined plane IS1 and the inclined plane IS2, meaning that the light-emitting surface of light source LS1 is significantly different from the light-emitting surface of light source LS2.

[0029] The light source module 10 also includes multiple optical microstructures OMS1 (defined as first optical microstructures) and multiple optical microstructures OMS2 (defined as second optical microstructures) disposed on the bottom surface 100bs of the light guide plate 100. The bottom surface 100bs of the light guide plate 100 is connected to the light-incident surface 100is1 and is opposite to the light-emitting surface 100es. It should be noted that, viewed from the light-emitting surface 100es of the light guide plate 100, the distribution of multiple optical microstructures OMS1 on the bottom surface 100bs can form a pattern PAT1, while the distribution of multiple optical microstructures OMS2 on the bottom surface 100bs can form a pattern PAT2. In this embodiment, pattern PAT1 is, for example, rain streaks, and pattern PAT2 is, for example, the word "RAIN," but this is not a limitation.

[0030] Referring to Figures 1, 2, and 3A, in this embodiment, multiple optical microstructures OMS1 are arranged corresponding to multiple light sources LS1, and multiple optical microstructures OMS2 are arranged corresponding to multiple light sources LS2. The optical microstructures OMS1 are adapted to reflect light rays L1 from the light sources LS1, causing them to pass through the light-emitting surface 100es of the light guide plate 100 and be projected within a specific angular range in the usage space. The optical microstructures OMS2 are adapted to reflect light rays L2 from the light sources LS2, causing them to pass through the light-emitting surface 100es of the light guide plate 100 and be projected within a specific angular range in the usage space.

[0031] In detail, each optical microstructure OMS1 has a patterned reflective surface PRS1 (defined as the first patterned reflective surface) facing the incident light surface 100is1, while each optical microstructure OMS2 has a patterned reflective surface PRS2 (defined as the second patterned reflective surface) facing the incident light surface 100is1. It should be noted that the perpendicular bisector PB1 of the patterned reflective surface PRS1 of each optical microstructure OMS1, which connects to the edge OMS1e (defined as the first edge) of the bottom surface 100bs, extends perpendicularly to the light-emitting surface LS1es of the light source LS1, and the perpendicular bisector PB2 of the patterned reflective surface PRS2 of each optical microstructure OMS2, which connects to the edge OMS2e (defined as the second edge) of the bottom surface 100bs, extends perpendicularly to the light-emitting surface LS2es of the light source LS2.

[0032] Due to the aforementioned configuration, the patterned reflective surface PRS1 of the optical microstructure OMS1 only effectively reflects light L1 from light source LS1 and suppresses its reflection of light L2 from light source LS2; conversely, the patterned reflective surface PRS2 of the optical microstructure OMS2 only effectively reflects light L2 from light source LS2 and suppresses its reflection of light L1 from light source LS1. Therefore, when light source LS1 is turned on and light source LS2 is turned off, a user within a specific angular range in the aforementioned usage space will only see the pattern PAT1 composed of multiple optical microstructures OMS1. When light source LS1 is turned off and light source LS2 is turned on, the user will only see the pattern PAT2 composed of multiple optical microstructures OMS2. When both light sources LS1 and LS2 are turned on simultaneously, the user can see both pattern PAT1 and pattern PAT2 simultaneously.

[0033] By using the groove GV1 on the light-incident surface 100is1, light sources LS1 and LS2 can have different light-emitting surfaces. Furthermore, the optical microstructures OMS1 and OMS2, corresponding to different light sources, will only effectively reflect light from their respective light sources, thereby enabling the switching display of pattern PAT1, pattern PAT2, or combinations thereof. Since multiple light sources LS1 and multiple light sources LS2 are located on the same light-incident side of the light guide plate 100 (i.e., one side of the light-incident surface 100is1), the overall layout space required for the light source can be significantly reduced, and the manufacturing cost of the light source module 10 can also be lowered.

[0034] Furthermore, in this embodiment, a plurality of optical microstructures OMS3 (defined as auxiliary optical microstructures) may be selectively provided on the bottom surface 100bs of the light guide plate 100. The distribution of these optical microstructures OMS3 on the bottom surface 100bs can form a pattern PAT3, and the pattern PAT3 is, for example, a thunderstorm cell and a lightning strike. The plurality of optical microstructures OMS3 are set to correspond to the light source LS3 (defined as an auxiliary light source) of the light source module 10, and the light source LS3 is set in another groove GV2 (defined as an auxiliary groove) on the light incident surface 100bs1 of the light guide plate 100.

[0035] In detail, the light guide plate 100 also has a slope IS3 (defined as an auxiliary slope) defining the groove GV2, and the light source LS3 has a light-emitting surface LS3es (defined as an auxiliary light-emitting surface) facing the slope IS3, wherein the light-emitting surface LS3es is approximately parallel to the slope IS3. In this embodiment, since the distribution range of multiple optical microstructures OMS3 is located in the area near the right edge of the light guide plate 100 (as shown in Figure 1), if the light source LS1 is arranged in the same manner for illumination in the area near the right side of the light incident surface 100is1, some of the optical microstructures OMS3 will be outside the light-emitting range of the light source LS1 and will not be able to receive the illumination light.

[0036] To address the aforementioned issues, the inclined surface IS3 defining the groove GV2 may not be parallel to the inclined surface IS1 defining the groove GV1. Preferably, the angle β between the inclined surfaces IS1 and IS3 is greater than or equal to 20 degrees and less than or equal to 30 degrees. More specifically, in this embodiment, the normal direction of the inclined surface IS3 is closer to the normal direction of the incident light surface 100is1 than the normal direction of the inclined surface IS1. Alternatively, the normal direction of the emitting surface LS1es of the light source LS3 is closer to the normal direction of the incident light surface 100is1 than the normal direction of the emitting surface LS1es of the light source LS3. Accordingly, the multiple optical microstructures OMS3 constituting the pattern PAT3 can all be located within the light emission range of the light source LS3.

[0037] Please refer to Figures 1, 2 and 3B. On the other hand, each optical microstructure OMS3 has a patterned reflective surface PRS3 (defined as an auxiliary patterned reflective surface) facing the incident light surface 100is1. The patterned reflective surface PRS3 is adapted to reflect the light L3 from the light source LS3, so that it passes through the light emitting surface 100es of the light guide plate 100 and is projected into a specific angular range in the use space.

[0038] It should be noted that the angle θ between the extension direction of the perpendicular bisector PB3 of the edge OMS3e (defined as the auxiliary edge) connecting the patterned reflective surface PRS3 of the optical microstructure OMS3 to the bottom surface 100bs and the normal direction of the light-emitting surface LS3es of the light source LS3 is greater than 0 degrees and less than or equal to 20 degrees. In other words, unlike the configuration relationship between the optical microstructure OMS1 and the light source LS1 (or, the optical microstructure OMS2 and the light source LS2), the extension direction of the perpendicular bisector PB3 of the edge OMS3e of the optical microstructure OMS3 is not perpendicular to the light-emitting surface LS3es of the light source LS3.

[0039] By utilizing the aforementioned configuration of the patterned reflective surface PRS3 and the light-emitting surface LS3es, the range of the pattern PAT3 illuminated by light L3 can be further increased. From another perspective, since the light source LS3 can have a slightly different light-emitting surface than the light source LS1, and the perpendicular bisector of the edge OMS3e of the patterned reflective surface PRS3 of the optical microstructure OMS3 can be non-perpendicular to the light-emitting surface LS3es of the light source LS3, the distribution range of the optical microstructure is no longer limited by the light-emitting range of the corresponding light source, which helps to increase the image size that the light source module 10 can present.

[0040] Referring to Figures 1 to 3B, in this embodiment, optical microstructures OMS1, OMS2, and OMS3 can each have substantially the same configuration, and each optical microstructure can be a symmetrical structure. For example, each optical microstructure can be a symmetrical rod-shaped structure. The aforementioned symmetrical structure means that the tilt angle of the patterned reflective surface and the other optical surface opposite to the patterned reflective surface of each optical microstructure relative to the bottom surface is substantially the same (100bs).

[0041] However, the present invention is not limited thereto. In another modified embodiment, each optical microstructure can be a symmetrical long arc-shaped structure (as shown in optical microstructure OMS-A in Figure 4A), wherein the perpendicular bisector PB of the edge OMSe-A of the patterned reflective surface PRS-A of optical microstructure OMS-A is, for example, the perpendicular bisector of the shortest line connecting its two endpoints. In yet another modified embodiment, each optical microstructure can be a different type of symmetrical long arc-shaped structure (as shown in optical microstructure OMS-B in Figure 4B), wherein the perpendicular bisector PB of the edge OMSe-B of the patterned reflective surface PRS-B of optical microstructure OMS-B is, for example, the perpendicular bisector of the shortest line connecting its two endpoints. The difference between optical microstructure OMS-A in Figure 4A and optical microstructure OMS-B in Figure 4B lies only in the radius of curvature of the edge of the patterned reflective surface; for example, the radius of curvature of edge OMSe-A in Figure 4A is greater than that of edge OMSe-B in Figure 4B.

[0042] The following examples illustrate this disclosure in detail, wherein the same components will be labeled with the same symbols, and descriptions of the same technical content will be omitted. For the omitted parts, please refer to the foregoing examples, which will not be repeated below.

[0043] Figure 5 is a top view of the light source module according to the second embodiment of the present invention. Figures 6A to 6E are enlarged views of five partial regions of the light source module of Figure 5. Figures 7A to 7C are cross-sectional views of the light source module of Figure 5. Figures 8A and 8B are bottom views of other modified embodiments of the optical microstructure of Figure 5. Figures 6A to 6E correspond to regions Z1 to Z5 of Figure 5, respectively.

[0044] Please refer to Figures 5 and 6A to 6E. Compared to the light source module 10 in Figure 1, the light source module 20 in this embodiment may further include multiple light sources LS4 (defined as third light sources), multiple light sources LS5 (defined as fourth light sources), light source LS6 (defined as auxiliary light sources), multiple optical microstructures OMS4 (defined as third optical microstructures), multiple optical microstructures OMS5 (defined as fourth optical microstructures), and multiple optical microstructures OMS6 (defined as auxiliary optical microstructures). In this embodiment, the technical effects produced by the configuration relationship between optical microstructures OMS1”, OMS2”, OMS3”, light sources LS1, LS2 and LS3 are similar to those of the configuration relationship between optical microstructures OMS1, OMS2, OMS3, LS1, LS2 and LS3 in Figure 1. Detailed explanations can be found in the relevant paragraphs of the aforementioned embodiments, and will not be repeated here. The pattern PAT1” composed of multiple optical microstructures OMS1” represents only a portion of the rain filaments. The other portion of the rain filaments is the pattern PAT4 composed of multiple optical microstructures OMS4. The pattern PAT3” composed of multiple optical microstructures OMS3” represents only a portion of the thunderstorm cells and lightning strikes. The other portion of the thunderstorm cells is the pattern PAT5 composed of multiple optical microstructures OMS5. The other portion of the lightning strikes is the pattern PAT6 composed of multiple optical microstructures OMS6.

[0045] In this embodiment, the light guide plate 100A also has another light-incident surface 100is2 (defined as a second light-incident surface) relative to the light-incident surface 100is1, and the light-incident surface 100is2 is provided with a plurality of grooves GV3 (defined as second grooves) and grooves GV4 (defined as auxiliary grooves), wherein the light-incident surface 100is2 connects the light-outceasing surface 100es and the bottom surface 100bs. The light guide plate 100A also has a slope IS4 (defined as a third slope) and a slope IS5 (defined as a fourth slope) defining each groove GV3, and a slope IS6 (defined as an auxiliary slope) defining the groove GV4. Since the arrangement of inclined surfaces IS4 and IS5 in each groove GV3 is similar to the arrangement of inclined surfaces IS1 and IS2 in groove GV1 in Figure 1, and the arrangement of inclined surfaces IS6 in groove GV4 and IS4 in groove GV3 is similar to the arrangement of inclined surfaces IS3 in groove GV2 and IS1 in groove GV1 in Figure 1, detailed explanations can be found in the relevant paragraphs of the foregoing embodiments, and will not be repeated here.

[0046] In this embodiment, each of the two grooves GV3 on the light-incident surface 100is2 near the middle region of Figure 5 can be equipped with a light source LS4 and a light source LS5, respectively. The groove GV3 closest to the left region of Figure 5 can be equipped with only one light source LS5, while the groove GV4 closest to the right region of Figure 5 can be equipped with only one light source LS6. The light sources LS4 and LS5 in the groove GV3 are respectively positioned corresponding to the inclined surfaces IS4 and IS5. The light source LS6 in the groove GV4 is positioned corresponding to the inclined surface IS6. More specifically, the light source LS4 has a light-emitting surface LS4es (defined as the third light-emitting surface) facing and parallel to the inclined surface IS4. The light source LS5 has a light-emitting surface LS5es (defined as the fourth light-emitting surface) facing and parallel to the inclined surface IS5. The light source LS6 has a light-emitting surface LS6es (defined as the auxiliary light-emitting surface) facing and parallel to the inclined surface IS6.

[0047] In this embodiment, multiple optical microstructures OMS4 are disposed on the bottom surface 100bs of the light guide plate 100A and correspond to multiple light sources LS4. Multiple optical microstructures OMS5 are disposed on the bottom surface 100bs of the light guide plate 100A and correspond to multiple light sources LS5. Multiple optical microstructures OMS6 are disposed on the bottom surface 100bs of the light guide plate 100A and correspond to light sources LS6. The optical microstructures OMS4 are adapted to reflect light rays L4 from the light sources LS4, allowing them to pass through the light-emitting surface 100es of the light guide plate 100A and be projected within a specific angular range in the usage space. The optical microstructures OMS5 are adapted to reflect light rays L5 from the light sources LS5, allowing them to pass through the light-emitting surface 100es of the light guide plate 100A and be projected within a specific angular range in the usage space. The optical microstructures OMS6 are adapted to reflect light rays L6 from the light sources LS6, allowing them to pass through the light-emitting surface 100es of the light guide plate 100A and be projected within a specific angular range in the usage space.

[0048] Each optical microstructure OMS4 has a patterned reflective surface PRS4 (defined as the third patterned reflective surface) facing the incident surface 100is2, each optical microstructure OMS5 has a patterned reflective surface PRS5 (defined as the fourth patterned reflective surface) facing the incident surface 100is2, and each optical microstructure OMS6 has a patterned reflective surface PRS6 (defined as the auxiliary patterned reflective surface) facing the incident surface 100is2. It should be noted that the perpendicular bisector PB4 of the patterned reflective surface PRS4 of each optical microstructure OMS4, connecting to the edge OMS4e (defined as the third edge) of the bottom surface 100bs, extends perpendicularly to the light-emitting surface LS4es of the light source LS4; the perpendicular bisector PB5 of the patterned reflective surface PRS5 of each optical microstructure OMS5, connecting to the edge OMS5e (defined as the fourth edge) of the bottom surface 100bs, extends perpendicularly to the light-emitting surface LS5es of the light source LS5; and the perpendicular bisector PB6 of the edge OMS6e (defined as the auxiliary edge) of each optical microstructure OMS6 does not extend perpendicularly to the light-emitting surface LS6es of the light source LS6. Among them, the angle θ” between the extension direction of the perpendicular bisector PB6 of the edge OMS6e of the patterned reflective surface PRS6 of each optical microstructure OMS6 and the normal direction of the light-emitting surface LS6es of the light source LS6 is greater than 0 degrees and less than or equal to 20 degrees.

[0049] The technical effects resulting from the configuration relationship between the aforementioned optical microstructures OMS4, OMS5, OMS6, light source LS4, light source LS5, and light source LS6 are similar to the configuration relationship between the optical microstructures OMS1, OMS2, OMS3, light source LS1, light source LS2, and light source LS3 in Figure 1. For detailed explanation, please refer to the relevant paragraphs of the aforementioned embodiments, which will not be repeated here.

[0050] It should be noted that, unlike the symmetrical structure of each optical microstructure on the light guide plate 100 in Figure 1, each optical microstructure in this embodiment is an asymmetrical rod-shaped structure. Referring to Figures 6A to 7C, each optical microstructure OMS1” also has an off-axis reflecting surface ORS1 (defined as the first off-axis reflecting surface) facing the incident light surface 100is2. The patterned reflecting surface PRS1 of the optical microstructure OMS1” has a patterned reflection angle PA1 (defined as the first patterned reflection angle) between it and the virtual extension surface VES of the bottom surface 100bs. The off-axis reflecting surface ORS1 of the optical microstructure OMS1” has an off-axis reflection angle OA1 (defined as the first off-axis reflection angle) between it and the virtual extension surface VES. Each optical microstructure OMS2” also has an off-axis reflecting surface ORS2 (defined as the second off-axis reflecting surface) facing the incident light surface 100is2. The patterned reflective surface PRS2 of the optical microstructure OMS2” has a patterned reflection angle PA2 (defined as the second patterned reflection angle) between it and the virtual extension surface VES. The off-axis reflective surface ORS2 of the optical microstructure OMS2” has an off-axis reflection angle OA2 (defined as the second off-axis reflection angle) between it and the virtual extension surface VES. Each optical microstructure OMS3” also has an off-axis reflective surface ORS3 (defined as an auxiliary off-axis reflective surface) facing the incident light surface 100is2. The patterned reflective surface PRS3 of the optical microstructure OMS3” has a patterned reflection angle PA3 (defined as the auxiliary patterned reflection angle) between it and the virtual extension surface VES. The off-axis reflective surface ORS3 of the optical microstructure OMS3” has an off-axis reflection angle OA3 (defined as the auxiliary off-axis reflection angle) between it and the virtual extension surface VES.

[0051] Each optical microstructure OMS4 also has an off-axis reflecting surface ORS4 (defined as the third off-axis reflecting surface) facing the incident surface 100is1. The patterned reflecting surface PRS4 of optical microstructure OMS4 has a patterned reflection angle PA4 (defined as the third patterned reflection angle) between it and the virtual extension surface VES. The off-axis reflecting surface ORS4 of optical microstructure OMS4 has an off-axis reflection angle OA4 (defined as the third off-axis reflection angle) between it and the virtual extension surface VES. Each optical microstructure OMS5 also has an off-axis reflecting surface ORS5 (defined as the fourth off-axis reflecting surface) facing the incident surface 100is1. The patterned reflecting surface PRS5 of optical microstructure OMS5 has a patterned reflection angle PA5 (defined as the fourth patterned reflection angle) between it and the virtual extension surface VES. The off-axis reflecting surface ORS5 of optical microstructure OMS5 has an off-axis reflection angle OA5 (defined as the fourth off-axis reflection angle) between it and the virtual extension surface VES. Each optical microstructure OMS6 also has an off-axis reflecting surface ORS6 (defined as an auxiliary off-axis reflecting surface) facing the incident surface 100is1. The optical microstructure OMS6 has a patterned reflection angle PA6 (defined as the auxiliary patterned reflection angle) between its patterned reflective surface PRS6 and virtual extension surface VES. The optical microstructure OMS6 also has an off-axis reflection angle OA6 (defined as the auxiliary off-axis reflection angle) between its off-axis reflective surface ORS6 and virtual extension surface VES.

[0052] It is particularly noteworthy that, in this embodiment, the pattern reflection angle PA1 of optical microstructure OMS1” is greater than the off-axis reflection angle OA1. The pattern reflection angle PA2 of optical microstructure OMS2” is greater than the off-axis reflection angle OA2. The pattern reflection angle PA3 of optical microstructure OMS3” is greater than the off-axis reflection angle OA3. The pattern reflection angle PA4 of optical microstructure OMS4 is greater than the off-axis reflection angle OA4. The pattern reflection angle PA5 of optical microstructure OMS5 is greater than the off-axis reflection angle OA5. The pattern reflection angle PA6 of optical microstructure OMS6 is greater than the off-axis reflection angle OA6. Preferably, the pattern reflection angle of each optical microstructure is greater than or equal to 45 degrees and less than or equal to 65 degrees, while its off-axis reflection angle is greater than or equal to 5 degrees and less than or equal to 25 degrees.

[0053] As shown in Figure 7A, among the multiple rays L1 emitted by light source LS1, some rays L1a are transmitted to the optical microstructure OMS1”, while other rays L1b are transmitted to the optical microstructure OMS5. Similarly, among the multiple rays L5 emitted by light source LS5, some rays L5a are transmitted to the optical microstructure OMS5, while other rays L5b are transmitted to the optical microstructure OMS1”. As shown in Figure 7B, among the multiple rays L2 emitted by light source LS2, some rays L2a are transmitted to the optical microstructure OMS2”, while other rays L2b are transmitted to the optical microstructure OMS4. Likewise, among the multiple rays L4 emitted by light source LS4, some rays L4a are transmitted to the optical microstructure OMS4, while other rays L4b are transmitted to the optical microstructure OMS2. As shown in Figure 7C, among the multiple rays L3 emitted by the light source LS3, some rays L3a are transmitted to the optical microstructure OMS3”, while other rays L3b are transmitted to the optical microstructure OMS6. Among the multiple rays L6 emitted by the light source LS6, some rays L6a are transmitted to the optical microstructure OMS6, while other rays L6b are transmitted to the optical microstructure OMS3”.

[0054] As shown in Figure 7A, light ray L1a, reflected by the patterned reflective surface PRS1 of the optical microstructure OMS1", exits from the light-emitting surface 100es at an exit angle A1. Light ray L1b, reflected by the off-axis reflective surface ORS5 of the optical microstructure OMS5, exits from the light-emitting surface 100es at an exit angle A2. Light ray L5a, reflected by the patterned reflective surface PRS5 of the optical microstructure OMS5, exits from the light-emitting surface 100es at an exit angle A3. Light ray L5b, reflected by the off-axis reflective surface ORS1 of the optical microstructure OMS1", exits from the light-emitting surface 100es at an exit angle A4. As shown in Figure 7B, light ray L2a, reflected by the patterned reflective surface PRS2 of the optical microstructure OMS2”, exits from the light-emitting surface 100es at an exit angle A5. Light ray L2b, reflected by the off-axis reflective surface ORS4 of the optical microstructure OMS4, exits from the light-emitting surface 100es at an exit angle A6. Light ray L4a, reflected by the patterned reflective surface PRS4 of the optical microstructure OMS4, exits from the light-emitting surface 100es at an exit angle A7. Light ray L4b, reflected by the off-axis reflective surface ORS2 of the optical microstructure OMS2”, exits from the light-emitting surface 100es at an exit angle A8. As shown in Figure 7C, light ray L3a, reflected by the patterned reflective surface PRS3 of the optical microstructure OMS3", exits from the light-emitting surface 100es at an exit angle A9. Light ray L3b, reflected by the off-axis reflective surface ORS6 of the optical microstructure OMS6, exits from the light-emitting surface 100es at an exit angle A10. Light ray L6a, reflected by the patterned reflective surface PRS6 of the optical microstructure OMS6, exits from the light-emitting surface 100es at an exit angle A11. Light ray L6b, reflected by the off-axis reflective surface ORS3 of the optical microstructure OMS3", exits from the light-emitting surface 100es at an exit angle A12. The exit angle is, for example, the angle between the light ray and the normal direction (e.g., direction Z) of the light-emitting surface 100es.

[0055] Please refer to Figures 7A to 7C. By limiting the angle range of the pattern reflection angle and the off-axis reflection angle of each optical microstructure, the exit angle of light reflected by the off-axis reflecting surface of the non-target optical microstructure (e.g., light L1b, light L2b, light L3b, light L4b, light L5b, light L6b) is significantly greater than the exit angle of light reflected by the pattern reflecting surface of the target optical microstructure (e.g., light L1a, light L2a, light L3a, light L4a, light L5a, light L6a). This prevents the light reflected by the off-axis reflecting surface from reaching the viewing range of the user's USR.

[0056] For example, if the light emitted by light source LS2 (e.g., light ray L2a) is incident on the patterned reflective surface PRS2 of the optical microstructure OMS2, it will be reflected by the patterned reflective surface PRS2 into the viewing range of the user's USR. Conversely, if the light emitted by light source LS2 (e.g., light ray L2b) is incident on the off-axis reflective surface ORS4 of the optical microstructure OMS4, it will be reflected by the off-axis reflective surface ORS4 out of the viewing range of the user's USR. And so on, without further explanation for other light sources. In this way, light emitted by the light source can be prevented from being reflected by non-corresponding optical microstructures into non-corresponding viewing directions.

[0057] In other words, when light source LS2 in Figure 5 is turned on and light source LS4 is turned off, user USR will only see pattern PAT2 and will not see pattern PAT4. Conversely, when light source LS4 in Figure 5 is turned on and light source LS2 is turned off, user USR will only see pattern PAT4 and will not see pattern PAT2. And so on. The relationship between the display effect of other patterns and the light source switching will not be elaborated further.

[0058] In this embodiment, the light source module 20 has multiple light sources on both opposite light-incident sides of the light guide plate 100A. Through the design of the off-axis reflective surface of the aforementioned optical microstructure, the distribution range of multiple optical microstructures corresponding to different light-incident sides on the bottom surface 100bs can overlap with each other. Therefore, while increasing the number or complexity of the display pattern, the size of the display pattern can be maintained.

[0059] Furthermore, in some modified embodiments, to allow light to diffuse in the direction of the perpendicular bisector of the edge of the patterned reflective surface of the optical microstructure, each optical microstructure in Figures 6A to 6E can be replaced by the optical microstructure OMS”-A of Figure 8A or the optical microstructure OMS”-B of Figure 8B. Both the optical microstructure OMS”-A of Figure 8A and the optical microstructure OMS”-B of Figure 8B are asymmetrical long arc-shaped structures, and the main difference between them lies in the different radii of curvature of the edges of the patterned reflective surfaces. For example, the radius of curvature of the edge OMS”eA of the patterned reflective surface PRS”-A in Figure 8A is greater than the radius of curvature of the edge OMS”eB of the patterned reflective surface PRS”-B in Figure 8B; conversely, the radius of curvature of the edge ORSe-A of the off-axis reflective surface ORS-A in Figure 8A is smaller than the radius of curvature of the edge ORSe-B of the off-axis reflective surface ORS-B in Figure 8B. It should be noted that the perpendicular bisectors of the edges OMS”eA and OMS”eB of the patterned reflective surface PRS”-A of the optical microstructure OMS”-A in Figure 8A and the patterned reflective surface PRS”-B in the optical microstructure OMS”-B in Figure 8B are, for example, the perpendicular bisectors of the shortest line connecting their two endpoints.

[0060] Figure 9 is a cross-sectional schematic diagram of a light source module according to a third embodiment of the present invention. Figure 10 is a cross-sectional schematic diagram of a light source module according to a fourth embodiment of the present invention. Figure 11 is a cross-sectional schematic diagram of a light source module according to a fifth embodiment of the present invention.

[0061] Referring to Figure 9, compared to the light source module 10 in Figure 1, the light source module 30 of this embodiment may further include a light-shielding layer LSL1 and a light-shielding layer LSL2. In this embodiment, a light source LS1 and a light source LS2 are disposed in one groove GV1 of the light guide plate 100B, while a light source LS1 is disposed in another groove GV1. Since the arrangement of light sources LS1 and LS2 in the grooves GV1 is similar to that of the light source module 10 in Figure 1, detailed descriptions can be found in the relevant paragraphs of the foregoing embodiments, and will not be repeated here.

[0062] It should be noted that in this embodiment, a light-shielding layer LSL1 is provided in the groove GV1 containing one light source LS1, while a light-shielding layer LSL2 is provided in the groove GV1 containing two light sources LS1 and LS2. For example, the light-shielding layer LSL1 can be disposed on the inclined surface IS2, and in the direction parallel to the light-emitting surface LS1es of the light source LS1, the light-shielding layer LSL1 overlaps with the light source LS1. The light-shielding layer LSL2 can be disposed on the inclined surface IS1, and in the direction parallel to the light-emitting surface LS2es of the light source LS2, the light-shielding layer LSL2 overlaps with the light source LS2 but does not overlap with the light-emitting surface LS1es of the light source LS1.

[0063] As shown in Figure 9, since some of the light emitted by the light source LS1 forms uncontrollable stray light L1s after being reflected by the inclined surface IS1, the light-shielding layer LSL1 can prevent the stray light L1s from entering the light guide plate 100B in an unexpected direction and affecting the display quality of the pattern. Similarly, since some of the light emitted by the light source LS2 does not enter the light guide plate 100B through the inclined surface IS2 to form uncontrollable stray light L2s, the light-shielding layer LSL2 can prevent the stray light L2s from entering the light guide plate 100B in an unexpected direction and affecting the display quality of the pattern.

[0064] However, the present invention is not limited thereto. Referring to FIG10, in another modified embodiment of the light source module 30A, the light guide plate 100C may also have a cavity recessed from the inclined surface. For example, in the light guide plate 100C of FIG10, the light-shielding layer LSL1 in FIG9 can be replaced by a cavity CAV1 recessed from the inclined surface IS2, and the light-shielding layer LSL2 in FIG9 can be replaced by a cavity CAV2 recessed from the inclined surface IS1. That is, in the direction parallel to the light-emitting surface LS1es of the light source LS1, the cavity CAV1 overlaps with the light source LS1. In the direction parallel to the light-emitting surface LS2es of the light source LS2, the cavity CAV2 overlaps with the light source LS2 but does not overlap with the light source LS1. By designing the cavity, the distance of stray light transmission to the light guide plate 100C is increased, thereby reducing the light energy of stray light entering the light guide plate 100C, and thus mitigating the impact of stray light on the pattern display quality.

[0065] In the embodiment shown in Figure 10, the light guide plate 100C also has a folded surface FS1 defining cavity CAV1 and a folded surface FS2 defining cavity CAV2, wherein folded surface FS1 and folded surface FS2 are respectively connected to inclined surface IS1 and inclined surface IS2 within the groove GV1 in which they are disposed. Referring to Figure 11, in another modified embodiment of the light source module 30B, the orthographic projection profile of the folded surface FS1" defining cavity CAV1" in the light guide plate 100D on the bottom surface 100bs can be stepped. The stepped folded surface FS1" design can increase the optical path offset of stray light L1s after passing through the folded surface FS1", thereby further mitigating the impact of stray light on the pattern display quality.

[0066] Figure 12 is a top view schematic diagram of a light source module according to a sixth embodiment of the present invention. Referring to Figure 12, the only difference between the light source module 10A of this embodiment and the light source module 10 of Figure 1 is that the light guide plate 100E of this embodiment is provided with a plurality of light-scattering microstructures SMS on the optical surface 100os opposite to the light incident surface 100is1. By designing these light-scattering microstructures SMS, it is possible to prevent light entering the light guide plate 100E from the light incident surface 100is1 from being reflected by the optical surface 100os and then directed back to the area where the optical microstructures are provided, thereby affecting the display quality of the pattern.

[0067] In summary, in one embodiment of the light source module of the present invention, a light guide plate has a groove on one light-incident side, and two light sources with different light-emitting directions are arranged in the groove. Multiple optical microstructures corresponding to different light sources are provided on the bottom surface of the light guide plate, and the extension direction of the perpendicular bisector of the edge connecting each optical microstructure to the bottom surface is perpendicular to the light-emitting surface of the corresponding light source. The two images formed by these optical microstructures can be switched and displayed by switching on and off the different light sources. Since the two light sources with different light-emitting directions are arranged on the same light-incident side of the light guide plate, the overall layout space required for the light source can be significantly reduced, and the manufacturing cost of the light source module can also be reduced. On the other hand, different light sources have different light-emitting surfaces, so that the distribution range of the optical microstructures is no longer limited by the light-emitting range of the corresponding light source, which helps to increase the image size that the light source module can present.

[0068] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the invention are still within the scope of the patent. Furthermore, any embodiment or claim of the present invention does not need to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and headings are merely for assisting in patent document searches and are not intended to limit the scope of the invention. Moreover, the terms "first," "second," etc., used in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements.

[0069] 10, 10A, 20, 30, 30A, 30B: Light source modules 100, 100A, 100B, 100C, 100D, 100E: Light guide plates 100bs: bottom surface 100es: Emitting light surface 100is1, 100is2: Light-receiving surface 100os: Optical surface A1~A12: Angle of emission CAV1, CAV1", CAV2: Cavity FS1, FS1”, FS2: Folded surfaces GV1, GV2, GV3, GV4: Grooves IS1, IS2, IS3, IS4, IS5, IS6: Inclined surface L1, L2, L3, L4, L5, L6, L1a, L2a, L3a, L4a, L5a, L6a, L1b, L2b, L3b, L4b, L5b, L6b: light L1s, L2s: Stray light LS1, LS2, LS3, LS4, LS5, LS6: Light Sources LS1es, LS2es, LS3es, LS4es, LS5es, LS6es: Light-emitting surfaces LSL1, LSL2: Light-shielding layers OA1~OA6: Off-axis reflection angle OMS1, OMS2, OMS3, OMS1”, OMS2”, OMS3”, OMS4, OMS5, OMS6, OMS-A, OMS-B, OMS”-A, OMS”-B: Optical microstructures OMS1e, OMS2e, OMS3e, OMS4e, OMS5e, OMS6e, OMSe-A, OMSe-B, OMS”eA, OMS”eB, ORSe-A, ORSe-B: Edge ORS1, ORS2, ORS3, ORS4, ORS5, ORS6, ORS-A, ORS-B: Off-axis reflecting surfaces PA1~PA6: Pattern Reflection Angle PAT1, PAT1”, PAT2, PAT3, PAT3”, PAT4, PAT5, PAT6: Patterns PB, PB1, PB2, PB3, PB4, PB5, PB6: Perpendicular bisectors PRS1, PRS2, PRS3, PRS4, PRS5, PRS6, PRS-A, PRS-B, PRS”-A, PRS”-B: Patterned reflective surface SMS: Astigmatic microstructure USR: User Z: Direction Z1, Z2, Z3, Z4, Z5: Regions α, β, θ, θ”: included angle

Claims

1. A light source module, comprising: A light guide plate has a first light-incident surface and a bottom surface connected to the first light-incident surface, wherein the first light-incident surface is provided with at least one first groove, and the at least one first groove includes a first inclined surface and a second inclined surface; a first light source is disposed on one side of the first light-incident surface of the light guide plate and has a first light-emitting surface facing the first inclined surface; a second light source is disposed on one side of the first light-incident surface of the light guide plate and has a second light-emitting surface facing the second inclined surface; a plurality of first optical microstructures are disposed on the bottom surface of the light guide plate and each has a first patterned reflective surface facing the first light-incident surface, the first patterned reflective surface has a first edge connected to the bottom surface, and the extension direction of the perpendicular bisector of the first edge is perpendicular to the first light-emitting surface of the first light source; And a plurality of second optical microstructures are disposed on the bottom surface of the light guide plate, and each has a second patterned reflective surface facing the first light incident surface. The second patterned reflective surface has a second edge connecting the bottom surface, and the extension direction of the perpendicular bisector of the second edge is perpendicular to the second light emitting surface of the second light source.

2. The light source module as claimed in claim 1, wherein the first inclined surface and the second inclined surface define a first groove of the at least one first groove, and the included angle between the first inclined surface and the second inclined surface is greater than or equal to 70 degrees and less than or equal to 110 degrees.

3. The light source module as described in claim 1 further includes: An auxiliary light source is disposed on one side of the first light-incident surface of the light guide plate, wherein the first light-incident surface is further provided with an auxiliary groove, and the light guide plate is further provided with an auxiliary inclined surface defining the auxiliary groove. The auxiliary inclined surface is not parallel to the first inclined surface, and the auxiliary light source is provided with an auxiliary light-emitting surface facing the auxiliary inclined surface; and a plurality of auxiliary optical microstructures are disposed on the bottom surface of the light guide plate, and each of them is provided with an auxiliary pattern reflective surface facing the first light-incident surface. The auxiliary pattern reflective surface is provided with an auxiliary edge connecting the bottom surface, and the angle between the extension direction of the perpendicular bisector of the auxiliary edge and the normal direction of the auxiliary light-emitting surface is greater than 0 degrees and less than or equal to 20 degrees.

4. The light source module as claimed in claim 3, wherein the angle between the first inclined plane and the auxiliary inclined plane is greater than or equal to 20 degrees and less than or equal to 30 degrees.

5. The light source module as described in claim 1, further comprising: A third light source is disposed on one side of a second light-incident surface of the light guide plate, wherein the second light-incident surface is opposite to the first light-incident surface, the second light-incident surface is provided with a second groove, the light guide plate is further provided with a third inclined surface defining the second groove, and the third light source is provided with a third light-emitting surface facing the third inclined surface; and a plurality of third optical microstructures are disposed on the bottom surface of the light guide plate, and each has a third patterned reflective surface facing the second light-incident surface, wherein the third patterned reflective surface has a third edge connecting the bottom surface, and the extension direction of the perpendicular bisector of the third edge is perpendicular to the third light-emitting surface of the third light source.

6. The light source module as claimed in claim 5, wherein each of the first optical microstructures further comprises a first off-axis reflecting surface facing the second light-incident surface, a first patterned reflecting angle between the first patterned reflecting surface and a virtual extension surface of the bottom surface, and a first off-axis reflecting angle between the first off-axis reflecting surface and the virtual extension surface of the bottom surface; each of the second optical microstructures further comprises a second off-axis reflecting surface facing the second light-incident surface, and a second patterned reflecting angle between the second patterned reflecting surface and the virtual extension surface of the bottom surface, the second off-axis... The reflective surface and the virtual extension surface of the bottom surface have a second off-axis reflection angle. Each of the third optical microstructures also has a third off-axis reflective surface facing the first incident surface. The third pattern reflective surface and the virtual extension surface of the bottom surface have a third pattern reflection angle. The third off-axis reflective surface and the virtual extension surface of the bottom surface have a third off-axis reflection angle. The first pattern reflection angle is greater than the first off-axis reflection angle, the second pattern reflection angle is greater than the second off-axis reflection angle, and the third pattern reflection angle is greater than the third off-axis reflection angle.

7. The light source module as claimed in claim 6, wherein the first pattern reflection angle, the second pattern reflection angle and the third pattern reflection angle are greater than or equal to 45 degrees and less than or equal to 65 degrees, and the first off-axis reflection angle, the second off-axis reflection angle and the third off-axis reflection angle are greater than or equal to 5 degrees and less than or equal to 25 degrees.

8. The light source module as described in claim 6 further includes: A fourth light source is disposed on one side of the second light-incident surface of the light guide plate, wherein the light guide plate also has a fourth inclined surface defining the second groove, and the fourth light source has a fourth light-emitting surface facing the fourth inclined surface; and a plurality of fourth optical microstructures are disposed on the bottom surface of the light guide plate, each having a fourth patterned reflective surface facing the second light-incident surface and a fourth off-axis reflective surface facing the first light-incident surface, wherein the fourth patterned reflective surface has a fourth edge connecting the bottom surface, the extension direction of the perpendicular bisector of the fourth edge is perpendicular to the fourth light-emitting surface of the fourth light source, a fourth patterned reflection angle is formed between the fourth patterned reflective surface and the virtual extension surface of the bottom surface, a fourth off-axis reflection angle is formed between the fourth off-axis reflective surface and the virtual extension surface of the bottom surface, and the fourth patterned reflection angle is greater than the fourth off-axis reflection angle.

9. The light source module as claimed in claim 8, wherein the fourth pattern reflection angle is greater than or equal to 45 degrees and less than or equal to 65 degrees, and the fourth off-axis reflection angle is greater than or equal to 5 degrees and less than or equal to 25 degrees.

10. The light source module as described in claim 1, further comprising: A light-shielding layer is disposed in the at least one first groove, the light-shielding layer overlapping the first light source in a direction parallel to the first light-emitting surface, or overlapping the second light source in another direction parallel to the second light-emitting surface.

11. The light source module as claimed in claim 1, wherein the light guide plate further has a cavity recessed from the first inclined surface, the cavity overlapping the second light source and not overlapping the first light source in a direction parallel to the second light emitting surface.

12. The light source module as claimed in claim 11, wherein the light guide plate further has a folded surface defining the cavity, and the folded surface connects the first inclined surface and the second inclined surface.

13. The light source module as claimed in claim 12, wherein the orthographic projection profile of the folded surface on the bottom surface is stepped.

14. The light source module as claimed in claim 1, wherein the light guide plate further has an optical surface relative to the first light incident surface, and the optical surface is provided with a plurality of light-scattering microstructures.

Images