Light Source Module

Abstract

To provide a light source module with a display function.SOLUTION: A light source module provided herein comprises a light guide plate, a first light source, and a plurality of first 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 source is disposed on a side of the first light incident surface of the light guide plate. The plurality of first optical microstructures is disposed on the bottom surface of the light guide plate, each first optical microstructures having a first light receiving surface disposed facing the first light source. The first light receiving surfaces of a first part of the first optical microstructures each have a first edge at a junction with the bottom surface, and a perpendicular bisector of the first edge passes through the first light source. The light source module disclosed herein offers a better display effect for three-dimensional images.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light source module, and more particularly to a light source module having a display function. [Background technology]

[0002] With the advancement of lighting technology, in addition to commonly used lighting fixtures that provide lighting functions, decorative lighting plates have been further developed to provide decorative effects. This type of decorative lighting plate has optical microstructures formed on the bottom surface of a light guide plate, and the position of each optical microstructure and the angle of its reflective surface are configured according to the effect that needs to be achieved on the decorative lighting plate. Light rays emitted from a light source enter the side (light incident surface) of the light guide plate, and are reflected by the optical microstructures to propagate toward and exit the light exit surface of the light guide plate, allowing users to see patterns or text formed by the light rays on the light exit surface side of the light guide plate.

[0003] In recent years, there has been a gradual increase in the need to display three-dimensional (3D) images using decorative lighting panels to improve the visual experience of viewers. However, displaying a three-dimensional image requires an increased number of optical microstructures to be arranged on the light guide panel, which can lead to problems such as insufficient brightness (luminance) of the entire displayed image and limited image size.

[0004] It should be noted that this "Background Art" section is intended only to aid in understanding the present invention, and therefore the content disclosed in this "Background Art" section may include technology that is not known to those skilled in the art. Therefore, the content disclosed in this "Background Art" section does not imply that the content or the problem that one or more embodiments of the present invention are intended to solve was already known to those skilled in the art prior to the filing of the present invention. Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a light source module that can display a relatively good stereoscopic image.

[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 or other objects, one embodiment of the present invention provides a light source module. The light source module includes a light guide plate, a first light source, and a plurality of first 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 source is disposed on the side of the first light incident surface of the light guide plate. A plurality of first optical microstructures are disposed on the bottom surface of the light guide plate. Each of the first optical microstructures has a first light-facing surface (also referred to as a light-receiving surface). The first light-facing surfaces are disposed facing the first light source. A first portion of the first optical microstructures each have a first edge at a connection point with the bottom surface, and a perpendicular bisector of the first edge passes through the first light source.

[0008] In one embodiment of the present invention, the above-mentioned light source module further includes a second light source and a plurality of second optical microstructures. The second light source is disposed on the second light-incident surface side of the light guide plate. The second light-incident surface is disposed opposite to the first light-incident surface and connected to the bottom surface. A plurality of second optical microstructures are disposed on the bottom surface of the light guide plate. Each of the second optical microstructures has a second light-facing surface. The second light-facing surfaces of the second optical microstructures are disposed toward the second light source.

[0009] In one embodiment of the present invention, a first portion of these first optical microstructures of the above-mentioned light source module constitutes a first pattern, and a second portion of these first optical microstructures constitutes a second pattern.

[0010] In one embodiment of the present invention, the first light source of the above-mentioned light source module is used to emit a plurality of first light beams toward the first light incident surface of the light guide plate, and these first light beams propagate within the first light exit region of the light guide plate; the second light source is used to emit a plurality of second light beams toward the second light incident surface of the light guide plate, and these second light beams propagate within the second light exit region of the light guide plate; and the area of ​​the overlapping area between the first light exit region and the second light exit region is less than 10% of the area of ​​the first light exit region.

[0011] In one embodiment of the present invention, there is a first angle between the first light-facing surface and the bottom surface of the above-mentioned light source module, and there is a second angle between the second light-facing surface and the bottom surface, and the first angle and the second angle are in the range of 35 degrees to 55 degrees.

[0012] In one embodiment of the present invention, each of the second light-facing surfaces of the first portions of the second optical microstructures of the above-mentioned light source module has a second edge at the connection point with the bottom surface, and the perpendicular bisector of the second edge passes through the second light source.

[0013] In one embodiment of the present invention, the first light-facing surfaces of the second portions of the first optical microstructures of the light source module each have a third edge at a connection point with the bottom surface, and the second light-facing surfaces of the second portions of the second optical microstructures each have a fourth edge at a connection point with the bottom surface, wherein the perpendicular bisector of the first edge of each first optical microstructure forms a first included angle with the first light incident surface, the perpendicular bisector of the second edge of each second optical microstructure forms a second included angle with the second light incident surface, the perpendicular bisector of the third edge of each first optical microstructure forms a third included angle with the first light incident surface, and the perpendicular bisector of the fourth edge of each second optical microstructure forms a fourth included angle with the second light incident surface, wherein the difference in angle between the first included angle and the third included angle of adjacent first optical microstructures is greater than the difference in angle between the second included angle and the fourth included angle of adjacent second optical microstructures.

[0014] In one embodiment of the present invention, the first included angle, the second included angle, the third included angle and the fourth included angle of the light source module are 90 degrees, or are in the range of 45 degrees to 90 degrees.

[0015] In one embodiment of the present invention, the above-mentioned light source module further includes a third light source and a plurality of third optical microstructures, the third light source is disposed on the side of the first light incident surface of the light guide plate, and the second light source is located between the first light source and the third light source in the arrangement direction of the first light source and the third light source, wherein the first light source is used to emit a plurality of first light beams, the second light source is used to emit a plurality of second light beams, and these second light beams propagate within the second light-emitting region of the light guide plate, the third light source is used to emit a plurality of third light beams, and these third light beams propagate within the third light-emitting region of the light guide plate, an overlapping area between the second light-emitting region and the third light-emitting region is less than 10% of the area of ​​the second light-emitting region, and the plurality of third optical microstructures are disposed on the bottom surface of the light guide plate, and these third optical microstructures each have a third light-facing surface, and these third light-facing surfaces face the third light source.

[0016] In one embodiment of the present invention, the above-mentioned light source module further includes at least one first auxiliary light source, which is disposed on the side of the first light-incident surface of the light guide plate and located between the first light source and the third light source.

[0017] In one embodiment of the present invention, the above-mentioned light source module further includes at least one first auxiliary light source, which is disposed on the side of the first light incident surface of the light guide plate. The light guide plate has a length L in a direction perpendicular to the first light incident surface. The first light source is used to emit a plurality of first light beams toward the first light incident surface of the light guide plate. The distance between each of the at least one first auxiliary light source and the first light source is less than 2L tan(θ), where θ is the maximum included angle between the first light beams and the normal direction of the first light incident surface.

[0018] In accordance with the above, in a light source module according to one embodiment of the present invention, a light guide plate has a first light incident surface and a second light incident surface opposite to each other and a bottom surface connected to the light incident surfaces, and a first light source and a second light source are respectively provided on both sides of the light incident surfaces of the light guide plate. By providing a plurality of first optical microstructures facing the first light source and a plurality of second optical microstructures facing the second light source on the bottom surface of the light guide plate, a large-scale image display effect can be achieved, and the brightness and uniformity of the overall image can also be improved.

[0019] In order to make the above-mentioned features and advantages of the present invention more apparent, the following detailed description will be given with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a front view of the light source module according to the first embodiment of the present invention. [Figure 2A] FIG. 2 is an enlarged view of one local area of ​​the light source module of FIG. 1; [Figure 2B] 2 is an enlarged view of another local area of ​​the light source module of FIG. 1; [Figure 3] FIG. 2 is a cross-sectional view of the light source module of FIG. [Figure 4] FIG. 10 is a cross-sectional view of a light source module according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a front view of a light source module according to a third embodiment of the present invention. [Figure 6] 6 is an enlarged view of a local area of ​​the light source module of FIG. 5. [Figure 7] 6 is a cross-sectional view of a local area of ​​the light source module of FIG. 5. [Figure 8] FIG. 10 is a front view of a light source module according to a fourth embodiment of the present invention. [Figure 9] 9 is an enlarged view of a local area of ​​the light source module of FIG. 8. [Figure 10] FIG. 10 is a front view of a light source module according to a fifth embodiment of the present invention. [Figure 11] FIG. 10 is a front view of a light source module according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The above and other technical contents, features, functions, and effects of the present invention will become more apparent from the following detailed description of preferred embodiments based on the accompanying drawings. Note that directional terms used in the following embodiments, such as up, down, left, right, front, and rear, are merely directions in the accompanying drawings. Therefore, the directional terms used are only for the purpose of explaining the present invention, and are not intended to limit the present invention.

[0022] FIG. 1 is a front view of a light source module according to a first embodiment of the present invention. FIGS. 2A and 2B are enlarged views of two local regions of the light source module of FIG. 1. FIG. 3 is a cross-sectional view of the light source module of FIG. 1. For convenience, FIGS. 2A and 2B only show a portion of the optical microstructure. As shown in FIGS. 1 to 3, the light source module 10 includes a light guide plate 100, a first light source 201, and a second light source 202. The light source module 10 is, for example, an illuminated decorative plate capable of displaying patterns or characters. The light guide plate 100 has a first light-incident surface 100a and a second light-incident surface 100b facing each other, and a bottom surface 100c and a light-emitting surface 100d facing each other. The bottom surface 100c and the light-emitting surface 100d are respectively connected between the first light-incident surface 100a and the second light-incident surface 100b. In this embodiment, the first light source 201 and the second light source 202 are point light sources, or each is implemented by a single light-emitting diode (LED). The material of the light guide plate 100 includes PC (polycarbonate), PMMA (polymethyl methacrylate), glass, or other highly light-transmitting resin materials.

[0023] The first light source 201 and the second light source 202 are respectively disposed on both sides of the first light incident surface 100a and the second light incident surface 100b of the light guide plate 100. In this embodiment, the light guide plate 100 has a first light exit region R1 and a second light exit region R2, but this is not limited thereto. The first light source 201 is used to emit a plurality of first light beams LB1 toward the first light incident surface 100a of the light guide plate 100. These first light beams LB1 propagate within the first light exit region R1 of the light guide plate 100 and exit the light guide plate 100 via the light exit surface 100d. The second light source 202 is used to emit a plurality of second light beams LB2 toward the second light incident surface 100b of the light guide plate 100. These second light beams LB2 propagate within the second light exit region R2 of the light guide plate 100 and exit the light guide plate 100 via the light exit surface 100d.

[0024] From another perspective, the propagation paths of the first light beams LB1 emitted by the first light sources 201 within the light guide plate 100 can define a first light-emitting region R1 of the light guide plate 100, and the propagation paths of the second light beams LB2 emitted by the second light sources 202 within the light guide plate 100 can define a second light-emitting region R2 of the light guide plate 100. In this embodiment, the vertical projection of the first light-emitting region R1 of the light guide plate 100 onto the light-emitting surface 100d does not overlap with the vertical projection of the second light-emitting region R2 onto the light-emitting surface 100d. That is, the first light beams LB1 propagating within the light guide plate 100 from the first light source 201 do not intersect with the second light beams LB2 propagating within the light guide plate 100 from the second light source 202. However, the present invention is not limited to this. In other embodiments, the first light-emitting region R1 of the light guide plate may partially overlap the second light-emitting region R2, for example, the area of ​​the overlapping region between the first light-emitting region R1 and the second light-emitting region R2 is less than 10% of the area of ​​the first light-emitting region R1.

[0025] It should be noted that the non-intersecting first beams LB1 and second beams LB2 do not include any unexpected reflection or scattering that occurs in these beams.

[0026] In this embodiment, the included angle θ1 between each of the first light beams LB1 after entering the light guide plate 100 and the normal direction of the first light incident surface 100a, and the included angle θ2 between each of the second light beams LB2 after entering the light guide plate 100 and the normal direction of the second light incident surface 100b are all 40 degrees or less, but are not limited to this. The range of the divergence angles of the first light beams LB1 within the light guide plate 100 is substantially equal to the range of the divergence angles of the second light beams LB2 within the light guide plate 100 (e.g., 80 degrees). This allows the first light-emitting region R1 and the second light-emitting region R2 to be densely arranged, improving the light output uniformity of the entire light source module 10.

[0027] Furthermore, the light source module 10 further includes a plurality of first optical microstructures 110 (as shown in FIG. 2A ) and a plurality of second optical microstructures 120 (as shown in FIG. 2B ) disposed on the bottom surface 100c of the light guide plate 100. The first optical microstructures 110 and the second optical microstructures 120 are disposed in the first light-emitting region R1 and the second light-emitting region R2 of the light guide plate 100, respectively. The plurality of first optical microstructures 110 (or the plurality of second optical microstructures 120) can be selectively divided into a plurality of portions, which can respectively form a plurality of patterns or characters on the light guide plate 100.

[0028] For example, in this embodiment, the first portion of the first optical microstructures 110 may be composed of a plurality of first optical microstructures 111, the second portion may be composed of a plurality of first optical microstructures 112, and the third portion may be composed of a plurality of first optical microstructures 113. The first optical microstructures 111, 112, and 113 may form a first pattern IM11, a second pattern IM12, and a third pattern IM13, respectively, and these patterns may overlap each other. Similarly, the first portion of the second optical microstructures 120 may be composed of a plurality of second optical microstructures 121, the second portion may be composed of a plurality of second optical microstructures 122, and the third portion may be composed of a plurality of second optical microstructures 123. The second optical microstructures 121, 122, and 123 may form a first pattern IM21, a second pattern IM22, and a third pattern IM23, respectively, and these patterns may overlap each other.

[0029] These patterns, which are made up of a plurality of optical microstructures, are, for example, patterns under different viewing angles of an object, and the first pattern IM11, the second pattern IM12, and the third pattern IM13 (or the first pattern IM21, the second pattern IM22, and the third pattern IM23) are seen at different positions by a viewer. Therefore, when the viewer's binoculars view the first pattern IM11 and the second pattern IM12 (or the first pattern IM11 and the third pattern IM13), respectively, a stereoscopic vision with a sense of depth can be generated.

[0030] For example, because the light beam reflected by the first optical microstructures 110 has high directivity, at the same viewing position, the viewer's left eye can see only one of the first pattern IM11, the second pattern IM12, and the third pattern IM13, while the viewer's right eye can see only the other of the first pattern IM11, the second pattern IM12, and the third pattern IM13. For example, when a viewer stands in front of the light source module 10 (i.e., on the side of the light output surface 100d of the light guide plate 100), a portion of the first light beam LB1 is reflected by the plurality of first optical microstructures 111 and propagates to the viewer's left eye, thereby appearing as the first pattern IM11, and another portion of the first light beam LB1 is reflected by the plurality of first optical microstructures 112 and propagates to the viewer's right eye, thereby appearing as the second pattern IM12. At this time, a stereoscopic vision under a certain viewing angle can be achieved in the viewer's eyes.

[0031] Subsequently, when the viewer moves laterally (e.g., horizontally in FIG. 1 ) to another position in front of the light source module 10, a portion of the first light beam LB1 is reflected by the plurality of first optical microstructures 111 and propagates to the viewer's right eye, where a first pattern IM11 appears, and another portion of the first light beam LB1 is reflected by the plurality of first optical microstructures 113 and propagates to the viewer's left eye, where a third pattern IM13 appears. At this time, a stereoscopic view at another specific viewing angle can be generated in the viewer's eyes. This can create a dynamic parallax sensation for the stereoscopic image when the viewer moves.

[0032] In order to reflect the light beam propagating within the light guide plate 100 toward the light output surface 100d, each of the first optical microstructures 110 has a connected first light-facing surface 110r and a first backlight surface 110b, and the multiple first light-facing surfaces 110r of each of the first optical microstructures 110 are all positioned facing the first light source 201. Similarly, each of the second optical microstructures 120 has a connected second light-facing surface 120r and a second backlight surface 120b, and the multiple second light-facing surfaces 120r of each of the second optical microstructures 120 are all positioned toward the second light source 202. Note that the light-facing surface being positioned toward the light source means that the perpendicular bisector of the intersection line between the light-facing surface and the bottom surface 100c is oriented toward the above-mentioned range near the light source. The range near the light source refers, for example, to an area where the light source and the light source extend to the left and right by twice the width of the light source, or an area where the center of the light source extends to the left and right by 5 mm.

[0033] In this embodiment, the first optical microstructure 110 and the second optical microstructure 120 are groove structures recessed from the bottom surface 100c of the light guide plate 100, and the outline of the area occupied by the groove structures when vertically projected onto the light output surface 100d may be, but is not limited to, a rectangle. Therefore, the light guide plate 100 defines two surfaces of the first optical microstructure 110, one of which is relatively close to the first light source 201 and is defined as a first light-facing surface 110r of the first optical microstructure 110, and the other of which is relatively far from the first light source 201 and is defined as a first backlight surface 110b of the first optical microstructure 110. Similarly, the light guide plate 100 defines two surfaces of the second optical microstructure 120, one of which is relatively close to the second light source 202 and is the second light-facing surface 120r of the second optical microstructure 120, and the other of which is relatively far from the second light source 202 and is the second backlight surface 120b of the second optical microstructure 120.

[0034] 3 , there is a first angle α1 between the first light-facing surface 110r and the bottom surface 100c of the first optical microstructure 110, and there is a second angle α2 between the second light-facing surface 120r and the bottom surface 100c of the second optical microstructure 120, and the first angle α1 and the second angle α2 are in the range of 35 degrees to 55 degrees. In this embodiment, the first angle α1 between the first light-facing surface 110r and the bottom surface 100c may optionally be different from the second angle α2 between the second light-facing surface 120r and the bottom surface 100c, and may also be adjusted so that the range of vertical heights of the emitted light of the first light beam LB1 is the same as or similar to the range of vertical heights of the emitted light of the second light beam LB2, but is not limited to this. Thus, the stereoscopic images generated by the first light beams LB1 reflected by the plurality of first optical microstructures 110 and the stereoscopic images generated by the second light beams LB2 reflected by the plurality of second optical microstructures 120 are respectively focused at different depths of the viewer's eyes, thereby realizing stereoscopic display effects with different depths of field. Note that the included angle between the first backlight surface 110b and the bottom surface 100c of the first optical microstructure 110 is, for example, 70 to 90 degrees, and the included angle between the second backlight surface 120b and the bottom surface 100c of the second optical microstructure 120 is, for example, 70 to 90 degrees, but the present invention is not limited thereto.

[0035] On the other hand, an edge E11 is formed at a connection point between each of the plurality of first light-facing surfaces 110r of the plurality of first optical microstructures 111 (i.e., a first portion of the plurality of first optical microstructures 110) and the bottom surface 100c, and an included angle β11 is formed between a perpendicular bisector B11 of the edge E11 of each first optical microstructure 111 and the first light-incident surface 100a. An edge E12 is formed at a connection point between each of the plurality of first light-facing surfaces 110r of the plurality of first optical microstructures 112 (i.e., a second portion of the plurality of first optical microstructures 110) and the bottom surface 100c, and an included angle β12 is formed between a perpendicular bisector B12 of the edge E12 of each first optical microstructure 112 and the first light-incident surface 100a. An edge E13 is present at the connection point between each of the plurality of first light-facing surfaces 110r of the plurality of first optical microstructures 113 (i.e., the third part of the plurality of first optical microstructures 110) and the bottom surface 100c, and an included angle β13 exists between the perpendicular bisector B13 of the edge E13 of each first optical microstructure 113 and the first light-incident surface 100a.

[0036] Similarly, an edge E21 is present at a connection point between each of the plurality of second light-facing surfaces 120r of the plurality of second optical microstructures 121 (i.e., a first portion of the plurality of second optical microstructures 120) and the bottom surface 100c, and an included angle β21 is present between a perpendicular bisector B21 of the edge E21 of each second optical microstructure 121 and the second light-incident surface 100b. An edge E22 is present at a connection point between each of the plurality of second light-facing surfaces 120r of the plurality of second optical microstructures 122 (i.e., a second portion of the plurality of second optical microstructures 120) and the bottom surface 100c, and an included angle β22 is present between a perpendicular bisector B22 of the edge E22 of each second optical microstructure 122 and the second light-incident surface 100b. An edge E23 exists at the connection point between each of the plurality of second light-facing surfaces 120r of the plurality of second optical microstructures 123 (i.e., the third part of the plurality of second optical microstructures 120) and the bottom surface 100c, and an included angle β23 exists between the perpendicular bisector B23 of the edge E23 of each second optical microstructure 123 and the second light-incident surface 100b.

[0037] For example, the included angle β11 of the first optical microstructure 111, the included angle β12 of the first optical microstructure 112, the included angle β13 of the first optical microstructure 113, the included angle β21 of the second optical microstructure 121, the included angle β22 of the second optical microstructure 122, and the included angle β23 of the second optical microstructure 123 are 90 degrees or in the range of 45 degrees to 90 degrees.

[0038] In order to project the multiple patterns composed of the multiple optical microstructures at different viewing angles in the viewing space (i.e., the space on the side of the light output surface 100d of the light guide plate 100), the included angles between the perpendicular bisectors of the light-facing surfaces of these optical microstructures and the light input surface of the light guide plate 100 are all different. Note that in this embodiment, the perpendicular bisectors B11 of the edge E11 of each first optical microstructure 111 all pass through the first light source 201, and the perpendicular bisectors B21 of the edge E21 of each second optical microstructure 121 all pass through the second light source 202, but the present invention is not limited thereto. In other embodiments, whether the perpendicular bisectors of the edges where the light-facing surfaces of the optical microstructures connect to the bottom surface pass through the light source may be determined based on actual application needs (e.g., the relative positional relationship between the viewing space and the light source module).

[0039] In this embodiment, the angular difference between the included angle β11 of adjacent first optical microstructures 111 and the included angle β12 of the first optical microstructures 112 (or the angular difference between the included angle β11 of adjacent first optical microstructures 111 and the included angle β13 of the first optical microstructures 113) may optionally be larger than the angular difference between the included angle β21 of adjacent second optical microstructures 121 and the included angle β22 of the second optical microstructures 122 (or the angular difference between the included angle β21 of adjacent second optical microstructures 121 and the included angle β23 of the second optical microstructures 123). This ensures that the dynamic parallax sensation experienced by a viewer moving between different viewing angles is lower for a stereoscopic image generated by the plurality of first optical microstructures 110 than for a stereoscopic image generated by the plurality of second optical microstructures 120. In other words, the viewer can perceive the location of the stereoscopic image generated by the plurality of first optical microstructures 110 as being farther away than the location of the stereoscopic image generated by the plurality of second optical microstructures 120, which can further enhance the viewer's visual experience of the stereoscopic image.

[0040] However, the present invention is not limited to this, and according to other embodiments, the angular difference between the included angle β11 of adjacent first optical microstructure 111 and the included angle β12 of first optical microstructure 112 (or the angular difference between the included angle β11 of adjacent first optical microstructure 111 and the included angle β13 of first optical microstructure 113) may be substantially equal to the angular difference between the included angle β21 of adjacent second optical microstructure 121 and the included angle β22 of second optical microstructure 122 (or the angular difference between the included angle β21 of adjacent second optical microstructure 121 and the included angle β23 of second optical microstructure 123).

[0041] The present invention will be described in detail below with reference to several other embodiments. Note that the same components are given the same reference numerals and the same technical content will not be described again. However, for the omitted parts, the above-mentioned embodiments can be referred to, and detailed descriptions thereof will be omitted below.

[0042] 4 is a cross-sectional view of a light source module according to a second embodiment of the present invention. As shown in FIG. 4, the light source module 10A of this embodiment differs from the light source module 10 of FIG. 3 in the arrangement of the optical microstructures on the light guide plate.

[0043] In this embodiment, the first optical microstructure 110' and the second optical microstructure 120' may be protruding structures protruding from the bottom surface 100c of the light guide plate 100A. Therefore, the light guide plate 100A defines two surfaces of the first optical microstructure 110', one of which is relatively far from the first light source 201 and is defined as a first light-facing surface 110r' of the first optical microstructure 110', and the other of which is relatively close to the first light source 201 and is defined as a first backlight-facing surface 110b' of the first optical microstructure 110'. Similarly, the light guide plate 100A defines two surfaces of the second optical microstructure 120', one of which is relatively far from the second light source 202 and is defined as a second light-facing surface 120r' of the second optical microstructure 120', and the other of which is relatively closer to the second light source 202 and is defined as a second backlight-facing surface 120b' of the second optical microstructure 120'.

[0044] Fig. 5 is a front view of a light source module according to a third embodiment of the present invention. Fig. 6 is an enlarged view of a local area of ​​the light source module of Fig. 5. Fig. 7 is a cross-sectional view of a local area of ​​the light source module of Fig. 5. For convenience, the optical microstructure of Fig. 6 is omitted in Fig. 5.

[0045] 5 to 7 . The light source module 20 of this embodiment differs from the light source module 10 of FIG. 1 in the number of light sources and the number of optical microstructures. Specifically, in order to present a light output area larger than that of the light source module 10, the light source module 20 further includes a third light source 203, which is disposed on the first light incident surface 100a side of the light guide plate 100B. In addition, the second light source 202 is located between the first light source 201 and the third light source 203 in the arrangement direction of the first light source 201 and the third light source 203 (i.e., the horizontal direction in FIG. 5 ).

[0046] In this embodiment, the light guide plate 100B further includes a third light-emitting region R3. Similar to the first light source 201, the third light source 203 is used to emit a plurality of third light beams LB3 toward the first light-incident surface 100a of the light guide plate 100B. These third light beams LB3 propagate within the light guide plate 100B and exit the light guide plate 100B via a portion of the light-exiting surface 100d located in the third light-emitting region R3. From another perspective, the propagation path of these third light beams LB3 emitted by the third light source 203 within the light guide plate 100B can define the third light-emitting region R3 of the light guide plate 100B. Specifically, the second light-emitting region R2 is located between the first light-emitting region R1 and the third light-emitting region R3.

[0047] Note that the vertical projection of the third light-emitting region R3 of the light guide plate 100B onto the light-emitting surface 100d does not overlap with the vertical projection of the second light-emitting region R2 onto the light-emitting surface 100d. That is, the third light beams LB3 propagating within the light guide plate 100B from the third light source 203 do not intersect with the second light beams LB2 propagating within the light guide plate 100B from the second light source 202. However, the present invention is not limited to this. In other embodiments, the third light-emitting region R3 of the light guide plate may partially overlap with the second light-emitting region R2. For example, the area of ​​the overlapping region between the second light-emitting region R2 and the third light-emitting region R3 is less than 10% of the area of ​​the second light-emitting region R2. Note that the non-intersecting third light beams LB3 and second light beams LB2 do not include unexpected reflections or scattering that occur in these light beams.

[0048] In this embodiment, the included angle θ3 between each of the third light beams LB3 entering the light guide plate 100B and the normal direction of the first light incident surface 100a is also 40 degrees or less, but is not limited to this. The range of the divergence angle of the third light beams LB3 within the light guide plate 100B (e.g., 80 degrees) is substantially equal to the range of the divergence angle of the first light beams LB1 and the second light beams LB2 within the light guide plate 100B. This allows the first light-emitting region R1, the second light-emitting region R2, and the third light-emitting region R3 to be densely packed, which improves the brightness and light output uniformity of the entire image of the light source module 20. From another perspective, the above-described light source arrangement method further increases the design flexibility of the light source module in terms of size, making it possible to create a light source module capable of displaying large (3D) images, for example.

[0049] Furthermore, the light source module 20 further includes a plurality of third optical microstructures 130 disposed on the bottom surface 100c of the light guide plate 100, and these third optical microstructures 130 may be disposed in the third light-emitting region R3 of the light guide plate 100B. Similar to the plurality of first optical microstructures 110 and the plurality of second optical microstructures 120, the plurality of third optical microstructures 130 may also be selectively divided into a plurality of portions, and these portions may respectively form a plurality of patterns on the light guide plate 100B. For example, the first portion of the plurality of third optical microstructures 130 may be composed of a plurality of third optical microstructures 131, the second portion may be composed of a plurality of third optical microstructures 132, and the third portion may be composed of a plurality of third optical microstructures 133. The third optical microstructures 131, the third optical microstructures 132, and the third optical microstructures 133 form a first pattern IM31, a second pattern IM32, and a third pattern IM33, respectively, and these patterns may partially overlap each other.

[0050] Similar to the plurality of first optical microstructures 110 and the plurality of second optical microstructures 120, the first pattern IM31, the second pattern IM32, and the third pattern IM33, which are made up of the plurality of third optical microstructures 130, are seen at different positions by the viewer. Therefore, when the viewer's binoculars view the first pattern IM31 and the second pattern IM32 (or the first pattern IM31 and the third pattern IM33), respectively, a stereoscopic view with a sense of depth can be created.

[0051] Each of the third optical microstructures 130 has a third light-facing surface 130r and a third back-light surface 130b connected thereto so as to reflect the third light beam LB3 propagating within the light guide plate 100B toward the light output surface 100d, and the plurality of third light-facing surfaces 130r of the third optical microstructures 130 are all disposed toward the third light source 203. In this embodiment, the third optical microstructures 130 are groove structures recessed from the bottom surface 100c of the light guide plate 100B, and the outline of the region occupied by the groove structure when vertically projected onto the light output surface 100d may be, but is not limited to, a rectangle. Therefore, the light guide plate 100B defines one of the two surfaces of the third optical microstructure 130, which is relatively close to the third light source 203, as the third light-facing surface 130r of the third optical microstructure 130, and the other, which is relatively far from the third light source 203, as the third backlight surface 130b of the third optical microstructure 130.

[0052] 3, 5 and 7, there is a third angle α3 between the third light-facing surface 130r of the third optical microstructure 130 and the bottom surface 100c, and the third angle α3 is in the range of 35 degrees to 55 degrees. In this embodiment, the first angle α1 of the first optical microstructure 110, the second angle α2 of the second optical microstructure 120 and the third angle α3 of the third optical microstructure 130 are different from each other, but are not limited thereto. In other embodiments, the first angle α1 of the first optical microstructure 110 may be different from the second angle α2 of the second optical microstructure 120, and the first angle α1 of the first optical microstructure 110 may be the same as the third angle α3 of the third optical microstructure 130. As a result, the stereoscopic images generated by these first light beams LB1 reflected by the multiple first optical microstructures 110, the stereoscopic images generated by these second light beams LB2 reflected by the multiple second optical microstructures 120, and the stereoscopic images generated by these third light beams LB3 reflected by the multiple third optical microstructures 130 can be focused at different depths in the viewer's eyes, thereby achieving stereoscopic display effects with different depths of field.

[0053] On the other hand, there is an edge E31 at the connection point between each of the plurality of third light-facing surfaces 130r of the plurality of third optical microstructures 131 (i.e., a first portion of the plurality of third optical microstructures 130) and the bottom surface 100c, and there is an included angle β31 between the perpendicular bisector B31 of the edge E31 of each first optical microstructure 111 and the first light-incident surface 100a. There is an edge E32 at the connection point between each of the plurality of third light-facing surfaces 130r of the plurality of third optical microstructures 132 (i.e., a second portion of the plurality of third optical microstructures 130) and the bottom surface 100c, and there is an included angle β32 between the perpendicular bisector B32 of the edge E32 of each third optical microstructure 132 and the first light-incident surface 100a. An edge E33 is formed at the connection point between each of the plurality of third light-facing surfaces 130r of the plurality of third optical microstructures 133 (i.e., the third portion of the plurality of third optical microstructures 130) and the bottom surface 100c, and an included angle β33 is formed between the first light-incident surface 100a and a perpendicular bisector B33 of the edge E33 of each third optical microstructure 133. For example, the included angle β31 of the third optical microstructure 131, the included angle β32 of the third optical microstructure 132, and the included angle β33 of the third optical microstructure 133 may be in the range of 45 degrees to 90 degrees.

[0054] In this embodiment, the perpendicular bisector B31 of the edge E31 of each third optical microstructure 131 all passes through the third light source 203, but the present invention is not limited thereto. In other embodiments, whether the perpendicular bisector of the edge where the light-facing surface of the optical microstructure connects to the bottom surface passes through the light source may be determined based on actual application needs (e.g., the relative positional relationship between the viewing space and the light source module). The arrangement relationship between these third optical microstructures 130, the first light incident surface 100a, and the third light source 203 is similar to the arrangement relationship between the plurality of first optical microstructures 110, the first light incident surface 100a, and the first light source 201 described above. For a detailed description thereof, please refer to the relevant paragraphs above, and therefore, a detailed description thereof will be omitted here.

[0055] FIG. 8 is a front view of a light source module according to a fourth embodiment of the present invention. FIG. 9 is an enlarged view of a local area of ​​the light source module of FIG. 8. For convenience, FIG. 8 omits the illustration of several optical microstructures of FIG. 9. As shown in FIGS. 8 and 9, the light source module 20A of this embodiment differs from the light source module 20 of FIG. 5 in the arrangement of the light sources of the light source module. Specifically, the light source module 20A further includes a first auxiliary light source 201A, which is disposed on the side of the first light incident surface 100a of the light guide plate 100B and is located on the side of the primary light source 201.

[0056] For example, the first auxiliary light source 201A is located between the first light source 201 and the second light source 202 in the arrangement direction of the first light source 201 and the third light source 203 (e.g., the horizontal direction in FIG. 8 ), but is not limited to this. In another embodiment, the first auxiliary light source 201A may be located on the side of the first light source 201 away from the third light source 203. In another embodiment, an auxiliary light source may be provided on each side of the first light source 201. In this embodiment, the distance d between the first auxiliary light source 201A and the first light source 201 may be, for example, less than 80 mm, less than 40 mm, or between 20 mm and 30 mm, where the distance d is defined by the distance between the geometric center of the first auxiliary light source 201A and the geometric center of the first light source 201. Note that in the above-mentioned different embodiments, the number of auxiliary light sources provided on each side (or on one side) may be two or more. For example, when there are two auxiliary light sources on the same side of the primary light source 201, the distance between one of the two auxiliary light sources and the primary light source 201 may be less than 40 mm, and the distance between the other auxiliary light source and the primary light source 201 may be less than 60 mm, but the present invention is not limited thereto.

[0057] In this embodiment, the light guide plate 100B further includes a first auxiliary light-exiting region R1A, and a first auxiliary light source 201A is used to face the first light incident surface 100a of the light guide plate 100B and emit a plurality of first auxiliary light beams LB1A. These first auxiliary light beams LB1A propagate within the light guide plate 100B and exit the light guide plate 100B via a portion of the light exit surface 100d located in the first auxiliary light-exiting region R1A. From another perspective, the propagation paths of these first auxiliary light beams LB1A emitted by the first auxiliary light source 201A within the light guide plate 100B can define the first auxiliary light-exiting region R1A of the light guide plate 100B.

[0058] Note that the vertical projection of the first auxiliary light-emitting region R1A of the light guide plate 100B on the light output surface 100d overlaps with the vertical projections of the first light-emitting region R1 and the second light-emitting region R2 on the light output surface 100d. More specifically, the overlapping area of ​​the vertical projection of the first auxiliary light-emitting region R1A and the first light-output region R1 on the light output surface 100d is larger than the overlapping area of ​​the vertical projection of the first auxiliary light-emitting region R1A and the second light-output region R2 on the light output surface 100d. In other words, the first auxiliary light beams LB1A propagating within the light guide plate 100B from the first auxiliary light source 201A intersect with a plurality of first light beams LB1 propagating within the light guide plate 100B from the first light source 201 and a plurality of second light beams LB2 propagating within the light guide plate 100B from the second light source 202. More specifically, the vertical projection of the first auxiliary light-emitting region R1A of the light guide plate 100B onto the light-emitting surface 100d substantially overlaps with the vertical projection of the first light-emitting region R1 onto the light-emitting surface 100d.

[0059] 9, these first auxiliary light beams LB1A can propagate in a direction of a larger visual angle in the viewing space after being reflected by the plurality of first light-directing surfaces 110r of the plurality of first optical microstructures 110. That is, by installing the first auxiliary light source 201A, a viewer can view a plurality of patterns (e.g., the first pattern IM11, the second pattern IM12, and the third pattern IM13 in FIG. 1) formed by the plurality of first optical microstructures 110 within a larger visual angle range, which can improve the adaptability of the light source module 20A to different application scenarios.

[0060] In addition, although the present embodiment is described by taking only one auxiliary light source as an example, the present invention is not limited to the illustrated content. In other embodiments, the number of auxiliary light sources can be adjusted to multiple according to actual application needs (e.g., the visible range of the image), and each auxiliary light source can be located on both sides of the multiple light sources.

[0061] FIG. 10 is a front view of a light source module according to a fifth embodiment of the present invention. As shown in FIG. 10, light source module 20B of this embodiment differs from light source module 20A of FIG. 8 in the number of light sources and auxiliary light sources. Specifically, compared to light source module 20A of FIG. 8, light source module 20B further includes another second light source 202, another third light source 203, and another first auxiliary light source 201A on the other side of first light source 201 (e.g., the left side in FIG. 10). First light source 201, two third light sources 203, and two first auxiliary light sources 201A are disposed on first light incident surface 100a of light guide plate 100C, and two second light sources 202 are disposed on second light incident surface 100b of light guide plate 100C. In addition, the arrangement of the second light source 202, the third light source 203 and the first auxiliary light source 201A located on the other side of the first light source 201 of the light source module 20B is similar to that of the light source module 20A of Figure 8, and for detailed explanations, please refer to the relevant paragraphs of the preceding embodiments, and detailed explanations thereof will be omitted here.

[0062] For example, in this embodiment, the two second light sources 202, the two third light sources 203, and the two first auxiliary light sources 201A located on opposite sides of the first light source 201 are arranged with the first light source 201 as the center of symmetry. In other words, in the arrangement direction of the first light source 201 and the third light source 203, the distance between each of the two second light sources 202 (or the two third light sources 203 or the two first auxiliary light sources 201A) and the first light source 201 is approximately the same.

[0063] 8, the first auxiliary light source 201A in this embodiment can be located midway between the first light source 201 and the third light source 203 in the arrangement direction of the first light source 201 and the third light source 203 (or in the direction parallel to the first light incident surface 100a), or between the first light source 201 and the third light source 203, or between the first light source 201 and the second light source 202. That is, the first auxiliary light source 201A of the light source module 20B is not located relatively close to the first light source 201 or the third light source 203. More specifically, the first auxiliary light source 201A in this embodiment can present to a viewer, within a wider viewing angle range, multiple patterns consisting of multiple first optical microstructures 110 (e.g., the first pattern IM11, the second pattern IM12, and the third pattern IM13 in FIG. 5) and multiple patterns consisting of multiple third optical microstructures 130 (e.g., the first pattern IM31, the second pattern IM32, and the third pattern IM33 in FIG. 5).

[0064] Fig. 11 is a front view of a light source module according to a sixth embodiment of the present invention. As shown in Fig. 11, light source module 30 of this embodiment differs from light source module 20A of Fig. 8 in that the number of light sources is different from the number of first auxiliary light sources and the arrangement of the first auxiliary light sources is different. Specifically, light source module 30 has one light source (e.g., first light source 201) and four first auxiliary light sources (e.g., first auxiliary light source 201A1, first auxiliary light source 201A2, first auxiliary light source 201A3, and first auxiliary light source 201A4).

[0065] In this embodiment, the primary light source 201 and the four primary auxiliary light sources are all disposed on the side of the first light incident surface 100a of the light guide plate 100D. The primary light source 201 faces the first light incident surface 100a of the light guide plate 100D and is used to emit a plurality of primary light beams LB1. The primary light beams LB1 propagate within the first light exit region R1 of the light guide plate 100D and exit the light guide plate 100D via the light exit surface 100d. From another perspective, the propagation paths of the primary light beams LB1 emitted by the primary light source 201 within the light guide plate 100D can define the first light exit region R1 of the light guide plate 100D.

[0066] In this embodiment, the distance between each of the four first auxiliary light sources and the first light source 201 is less than the maximum distance d', which is 2L tan(θ), where θ is the maximum included angle between each of the first light beams LB1 after entering the light guide plate 100D and the normal to the first light incident surface 100a (i.e., the maximum included angle), and L is the length of the light guide plate 100D in the direction perpendicular to the first light incident surface 100a. In other words, the maximum distance d' defines the maximum range extending on both sides of the geometric center of the first auxiliary light source 201A, and all of the first auxiliary light sources are installed within this maximum range. For example, when the light guide plate 100D is made of PMMA and the first light incident surface 100a is a smooth surface, the maximum included angle θ is approximately 42 degrees, but is not limited to this.

[0067] In this embodiment, first auxiliary light sources are arranged on both opposing sides of the primary light source 201, and the number of first auxiliary light sources on both sides may be selectively different or the same, but the present invention is not limited thereto. For example, the numbers of first auxiliary light sources arranged on the right and left sides of the primary light source 201 in Fig. 11 are one (i.e., first auxiliary light source 201A1) and three (i.e., first auxiliary light source 201A2, first auxiliary light source 201A3, and first auxiliary light source 201A4), respectively, but are not limited thereto.

[0068] By providing multiple first auxiliary light sources, the number of which may be the same or different, on opposite sides of the primary light source 201 and setting the distance between each of these first auxiliary light sources and the primary light source 201 to be less than 2L tan(θ) (i.e., the maximum distance d'), a viewer can view multiple patterns (e.g., the first pattern IM11, the second pattern IM12, and the third pattern IM13 in FIG. 1 ) consisting of multiple first optical microstructures within a wider viewing angle range. This is advantageous in improving the adaptability of the light source module 30 to different application scenarios. In other words, it increases the design margin of the light source module 30. Note that the design of providing the maximum distance d' between the auxiliary light sources in the light source module 30 can also be applied to the different embodiments of FIGS. 1 to 9.

[0069] In view of the above, in a light source module according to one embodiment of the present invention, a light guide plate has a first light incident surface and a second light incident surface that are arranged opposite to each other and a bottom surface connected to the light incident surfaces, and a first light source and a second light source are respectively arranged on both sides of the light incident surfaces of the light guide plate. By arranging a plurality of first optical microstructures facing the first light source and a plurality of second optical microstructures facing the second light source on the bottom surface of the light guide plate, it is possible to achieve a large-scale image display effect and improve the brightness and uniformity of the overall image.

[0070] The present invention has been disclosed above based on the preferred embodiments described above. However, the preferred embodiments described above are not intended to limit the present invention. Those skilled in the art may make minor modifications and adaptations to the present invention without departing from the technical spirit and scope of the present invention. Therefore, the scope of protection of the present invention is defined by the appended claims. Furthermore, it is not necessary for any embodiment or claim of the present invention to achieve all of the objectives, advantages, or features disclosed in the present invention. Furthermore, the abstract and title of the invention are intended only to facilitate document search and do not limit the technical scope of the present invention. Furthermore, terms such as "first," "second," etc. used in the present specification or claims are intended only to name elements or distinguish other embodiments or scopes, and are not intended to limit the upper or lower limits on the number of elements. [Explanation of symbols]

[0071] 10, 10A, 20, 20A, 20B, 30: Electronic equipment 100, 100A, 100B, 100C, 100D: Light guide plate 100a: First light incident surface 100b: Second light incident surface 100c: Bottom 100d: Idemitsu surface 110, 110', 111, 112, 113: First optical fine structure 110r, 110r': first light-facing surface 110b, 110b': First back surface 120, 120', 121, 122, 123: second optical fine structure 120r, 120r': Second light-facing surface 120b, 120b': Second back surface 130, 131, 132, 133: Third optical fine structure 130r: Third light-facing surface 130b: Third back surface 201: First light source 201A, 201A1, 201A2, 201A3, 201A4: First auxiliary light source 202:Second light source 203:Third light source B11, B12, B13, B21, B22, B23, B31, B32, B33: perpendicular bisectors d, d’: distances E11, E12, E13, E21, E22, E23, E31, E32, E33: edges IM11, IM21, IM31: first patterns IM12, IM22, IM32: second patterns IM13, IM23, IM33: third patterns L: length LB1: first light beam LB1A: first auxiliary light beam LB2: second light beam LB3: third light beam LB1A: first auxiliary light beam R1: first light-emitting region R1A: first auxiliary light-emitting region R2: second light-emitting region R3: third light-emitting region θ, θ1, θ2, θ3, β11, β12, β13, β21, β22, β23, β31, β32, β33: included angles α1, α2, α3: angles

Claims

1. A light source module, a light guide plate having a first light incident surface and a bottom surface connected to the first light incident surface; a first light source disposed on the side of the first light incident surface of the light guide plate; and a plurality of first optical microstructures disposed on the bottom surface of the light guide plate; Each of the plurality of first optical microstructures has a first light-facing surface, and the plurality of first light-facing surfaces are disposed facing the first light source; a first edge is formed at a connection point between each of the first light-facing surfaces of the first portion of the first optical microstructures and the bottom surface, and a perpendicular bisector of the first edge passes through the first light source; The light source module includes: a second light source disposed on the second light incident surface side of the light guide plate; and The light guide plate further includes a plurality of second optical microstructures disposed on the bottom surface thereof; the second light incident surface is disposed opposite to the first light incident surface and is connected to the bottom surface; Each of the second optical microstructures has a second light-facing surface, and the second light-facing surfaces of the second optical microstructures are positioned facing the second light source; a second edge is formed at a connection point between each of the second light-facing surfaces of the first portion of the second optical microstructures and the bottom surface, and a perpendicular bisector of the second edge passes through the second light source; a third edge at a connection point between each of the first light-facing surfaces of the second portion of the first optical microstructures and the bottom surface, and a fourth edge at a connection point between each of the second light-facing surfaces of the second portion of the second optical microstructures and the bottom surface; a perpendicular bisector of the first edge of each of the first optical microstructures forms a first included angle with the first light incident surface, a perpendicular bisector of the second edge of each of the second optical microstructures forms a second included angle with the second light incident surface, a perpendicular bisector of the third edge of each of the first optical microstructures forms a third included angle with the first light incident surface, and a perpendicular bisector of the fourth edge of each of the second optical microstructures forms a fourth included angle with the second light incident surface; a difference in angle between the first included angle and the third included angle of the adjacent plurality of first optical microstructures is greater than a difference in angle between the second included angle and the fourth included angle of the adjacent plurality of second optical microstructures.

2. 2. The light source module according to claim 1, the first light source is used to emit a plurality of first light beams facing the first light input surface of the light guide plate, and the plurality of first light beams propagate within a first light output area of ​​the light guide plate; the second light source is used to emit a plurality of second light beams facing the second light input surface of the light guide plate, the plurality of second light beams propagating within a second light output area of ​​the light guide plate; The area of ​​the overlapping region between the first light-emitting region and the second light-emitting region is less than 10% of the area of ​​the first light-emitting region.

3. 2. The light source module according to claim 1, a first angle between the first light-facing surface and the bottom surface, a second angle between the second light-facing surface and the bottom surface, and the first angle and the second angle are in a range of 35 degrees to 55 degrees.

4. 2. The light source module according to claim 1, The light source module, wherein the first included angle, the second included angle, the third included angle, and the fourth included angle are 90 degrees or in the range of 45 degrees to 90 degrees.

5. A light source module according to claim 1, a third light source disposed on the side of the first light incident surface of the light guide plate; and The light guide plate further includes a plurality of third optical microstructures disposed on the bottom surface thereof; the second light source is located between the first light source and the third light source in an arrangement direction of the first light source and the third light source, the second light source is used to emit a plurality of second light beams, and the plurality of second light beams propagate within a second light-emitting region of the light guide plate; the third light source is used to emit a plurality of third light beams, and the plurality of third light beams propagate within a third light-emitting region of the light guide plate; and an area of ​​an overlapping region between the second light-emitting region and the third light-emitting region is less than 10% of an area of ​​the second light-emitting region; a light source module, wherein each of the plurality of third optical microstructures has a third light-facing surface, and the plurality of third light-facing surfaces are disposed facing the third light source.

6. 6. The light source module according to claim 5, the light source module further includes at least one first auxiliary light source disposed on the side of the first light-incident surface of the light guide plate and positioned between the first light source and the third light source.

7. 2. The light source module according to claim 1, The light guide plate further includes at least one first auxiliary light source disposed on the first light incident surface side thereof; a light source module, wherein the light guide plate has a length L in a direction perpendicular to the first light incident surface, the first light source is used to emit a plurality of first light beams facing the first light incident surface of the light guide plate, and a distance between each of the at least one first auxiliary light source and the first light source is smaller than 2L tan(θ), where θ is the maximum included angle between the plurality of first light beams and a normal direction of the first light incident surface.

Images