Light source module

Abstract

The invention provides a light source module which comprises a light guide plate, a first light source and a plurality of optical microstructures. The light guide plate has a first incident surface, a first side surface and a first surface. The first incident surface and the first side are connected with the first surface. The first surface of the light guide plate has a first region and a second region. The second region is located between one of the first light incident surface and the first side surface and the first region. The first light source is arranged on one side of the first incident surface of the light guide plate. The plurality of optical microstructures is disposed on the first surface. The distribution density of the optical microstructures in the first area is smaller than that of the optical microstructures in the second area.

Description

Technical Field

[0001] The present invention relates to a light source module, and in particular to a light source module provided with a light guide plate. Background Art

[0002] For non-self-luminous display panels, such as reflective or transmissive LCDs, a combination of light source modules can meet the application requirements of these display panels in different environments. To achieve a slimmer appearance, most current light source modules use a side-lit design, where the light source is located adjacent to a side of a light guide plate (LGP), which is connected to the light-emitting surface of the LGP. However, this design can lead to poor light uniformity at wide viewing angles, resulting in poor visual quality or reduced display contrast. Summary of the Invention

[0003] The present invention is directed to a light source module having better light emission uniformity at a wide viewing angle.

[0004] According to an embodiment of the present invention, a light source module includes a light guide plate, a first light source, and a plurality of optical microstructures. The light guide plate has a first light incident surface, a first side surface, and a first surface. The first light incident surface and the first side surface are connected to the first surface. The first surface of the light guide plate has a first area and a second area. The second area is located between the first light incident surface and one of the first side surfaces and the first area. The first light source is arranged on one side of the first light incident surface of the light guide plate. A plurality of optical microstructures are arranged on the first surface. The distribution density of these optical microstructures in the first area is less than the distribution density in the second area.

[0005] In a light source module according to an embodiment of the present invention, the light source module further includes a second light source disposed on one side of the second light incident surface of the light guide plate. The first light incident surface and the second light incident surface are opposite to or connected to each other. The first surface of the light guide plate further includes a third region. The first region is located between the second region and the third region. The distribution density of the plurality of optical microstructures in the third region is greater than the distribution density in the first region.

[0006] In a light source module according to an embodiment of the present invention, a first light source includes a plurality of first light-emitting elements and a plurality of second light-emitting elements. The first light-emitting elements and the second light-emitting elements are arranged in a direction parallel to the first light incident surface. The first light-emitting elements are arranged at a first pitch. The second light-emitting elements are arranged at a second pitch, and the first pitch is greater than the second pitch.

[0007] In a light source module according to an embodiment of the present invention, a plurality of optical microstructures are recessed or protruded from a first surface, and each has a structural height along a normal direction of the first surface. The structural height of each of the optical microstructures first increases and then decreases, or first decreases and then increases, as it moves away from an edge of the first surface.

[0008] In the light source module according to an embodiment of the present invention, the light guide plate further has a second surface connected to the first light incident surface, the second surface faces away from the first surface, and at least one of the first surface and the second surface is a curved surface.

[0009] In the light source module according to the embodiment of the present invention, the distance between the first surface and the second surface first increases and then decreases, or first decreases and then increases, as the distance moves away from the edge of the first surface.

[0010] In the light source module according to the embodiment of the present invention, one of the first surface and the second surface is a concave surface, and the other of the first surface and the second surface is a convex surface.

[0011] In a light source module according to an embodiment of the present invention, a plurality of optical microstructures are recessed from a first surface and each have a first optical surface, a second optical surface, and a bottom surface connecting the first optical surface and the second optical surface. A first angle is formed between the first optical surface and a virtual extension surface of the bottom surface. A second angle is formed between the second optical surface and the bottom surface. The second angle is greater than or equal to the first angle, and the first angle and the second angle are each greater than or equal to 40 degrees and less than or equal to 50 degrees.

[0012] In the light source module according to an embodiment of the present invention, the first surface has an opening defining each optical microstructure, the opening and the bottom surface respectively have a first width and a second width along the normal direction of the first light incident surface, and the first width is greater than or equal to the second width.

[0013] In the light source module according to the embodiment of the present invention, the cross-sectional profiles of the first optical surface and the second optical surface are straight, curved, broken line, or a combination of straight and curved shapes.

[0014] In the light source module according to the embodiment of the present invention, the plurality of optical microstructures include a plurality of first optical microstructures protruding from the first surface and a plurality of second optical microstructures recessed from the first surface, and the first optical microstructures are spaced apart from the second optical microstructures.

[0015] In a light source module according to an embodiment of the present invention, each of the plurality of first optical microstructures has a first optical surface and a second optical surface connected to each other. The first optical surface is located between the first light incident surface and the second optical surface. A first angle is formed between the first optical surface and the virtual extension surface of the first surface. A second angle is formed between the second optical surface and the virtual extension surface, and the first angle is greater than the second angle. Each of the plurality of second optical microstructures has a third optical surface and a fourth optical surface connected to each other. The third optical surface is located between the first light incident surface and the fourth optical surface. A third angle is formed between the third optical surface and the virtual extension surface. A fourth angle is formed between the fourth optical surface and the virtual extension surface, and the third angle is less than the fourth angle.

[0016] In a light source module according to an embodiment of the present invention, a plurality of optical microstructures protrude from a first surface and each have a first optical surface and a second optical surface connected to each other. The first optical surface is positioned between the first light incident surface and the second optical surface. The first optical surface forms a first angle with a virtual extension surface of the first surface. The second optical surface forms a second angle with the virtual extension surface, and the first angle is greater than the second angle.

[0017] In a light source module according to an embodiment of the present invention, a plurality of optical microstructures are recessed from a first surface and each have a third optical surface and a fourth optical surface connected to each other. The third optical surface is positioned between the first light incident surface and the fourth optical surface. The third optical surface forms a third angle with a virtual extension surface of the first surface. The fourth optical surface forms a fourth angle with the virtual extension surface, and the third angle is smaller than the fourth angle.

[0018] In a light source module according to an embodiment of the present invention, each of the plurality of optical microstructures includes a recessed portion recessed from a first surface and a raised portion raised from the first surface. The recessed portion and the raised portion each have a depth and a height along a normal direction to the first surface, and the depth of the recessed portion is greater than or equal to the height of the raised portion.

[0019] In a light source module according to an embodiment of the present invention, each of the plurality of optical microstructures includes a first portion and a second portion. The first portion connects the first surface and the second portion. The first portion is symmetrically arranged about an axis of symmetry perpendicular to the first surface, and the second portion is asymmetrically arranged about the axis of symmetry.

[0020] In the light source module according to the embodiment of the present invention, the first light incident surface is provided with at least one surface structure, and the at least one surface structure includes a cylindrical lens structure, a lens structure or a pyramid structure.

[0021] In the light source module according to the embodiment of the present invention, the light guide plate is provided with at least one hole.

[0022] In the light source module according to the embodiment of the present invention, the orthographic projection profile of the at least one hole on the first surface is wavy, circular, or polygonal.

[0023] In a light source module according to an embodiment of the present invention, at least one hole is a strip-shaped hole extending parallel to the first light incident surface. The light guide plate further has a first inner surface and a second inner surface defining the strip-shaped hole. At least one of the first inner surface and the second inner surface is provided with a plurality of surface microstructures.

[0024] Based on the above, in a light source module according to one embodiment of the present invention, a light guide plate is provided with a plurality of optical microstructures on a first surface connected to the first light incident surface. These optical microstructures have different distribution densities in the first and second regions of the first surface. This improves the uniformity of light output from the light source module at a wide viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1A is a schematic top view of a light source module according to a first embodiment of the present invention;

[0026] Figure 1B yes Figure 1A A cross-sectional schematic diagram of a light source module;

[0027] Figures 2A to 2C yes Figure 1B Schematic cross-sectional views of other modified embodiments of the optical microstructure of the light guide plate;

[0028] Figures 3A to 3E and Figures 4A to 4D 1 are schematic top views of other modified embodiments of the light source module of FIG. 1 ;

[0029] Figure 5 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention;

[0030] Figure 6A is a schematic cross-sectional view of a light source module according to a second embodiment of the present invention;

[0031] Figures 6B to 6D yes Figure 6A Schematic cross-sectional views of other modified embodiments of the light source module;

[0032] Figure 7A is a schematic cross-sectional view of a light source module according to a third embodiment of the present invention;

[0033] Figures 7B to 7C yes Figure 7A Schematic cross-sectional views of other modified embodiments of the light source module;

[0034] Figure 8A is a schematic cross-sectional view of a light source module according to a fourth embodiment of the present invention;

[0035] Figures 8B to 8C yes Figure 8A Schematic cross-sectional views of other modified embodiments of the light source module;

[0036] Figure 9 is a schematic cross-sectional view of a light source module according to a fifth embodiment of the present invention;

[0037] 10A to 10D yes Figure 9 Schematic cross-sectional views of other modified embodiments of the light source module;

[0038] Figure 11A is a schematic cross-sectional view of a light source module according to a sixth embodiment of the present invention;

[0039] Figure 11B yes Figure 11A A cross-sectional schematic diagram of another modified embodiment of the light source module;

[0040] Figure 12 is a schematic cross-sectional view of a light source module according to a seventh embodiment of the present invention;

[0041] Figure 13A yes Figure 12 A cross-sectional schematic diagram of another modified embodiment of the light source module;

[0042] Figure 13B yes Figure 13A An enlarged schematic diagram of a local area of ​​a light source module;

[0043] Figure 14 is a schematic cross-sectional view of a light source module according to an eighth embodiment of the present invention;

[0044] Figure 15 is a schematic cross-sectional view of a light source module according to a ninth embodiment of the present invention;

[0045] Figure 16A is a perspective schematic diagram of a light guide plate according to an embodiment of the present invention;

[0046] Figures 16B to 16E yes Figure 16A Schematic perspective views of other modified embodiments of the light guide plate;

[0047] Figure 17A is a schematic top view of a light source module according to a tenth embodiment of the present invention;

[0048] Figure 17B yes Figure 17A A cross-sectional schematic diagram of a light source module;

[0049] Figure 17C and Figure 17D yes Figure 17A Schematic top views of other variant embodiments of the light source module;

[0050] Figure 18A is a schematic top view of a light source module according to an eleventh embodiment of the present invention;

[0051] Figure 18B yes Figure 18A A schematic top view of another modified embodiment of the light source module;

[0052] Figure 19A yes Figure 18A or Figure 18B An enlarged schematic diagram of a hole in a light guide plate;

[0053] Figures 19B to 19D yes Figure 19ASchematic top view of other modified embodiments of the hole.

[0054] Description of Reference Numerals

[0055] 1: Display device;

[0056] 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 11, 12, 13, 14, 21, 22, 23, 24, 25, 26, 30, 30A, 30B, 30C, 30D, 40, 40A, 50, 60, 71, 72, 73, 81, 82: light source module;

[0057] 100: light guide plate;

[0058] 100h1, 100h2, 100h3, 100h4, 100h5: holes;

[0059] 100s1: first side;

[0060] 100s2: second side;

[0061] 100s3: third side;

[0062] 100s4: fourth side;

[0063] A1: Area 1;

[0064] A2: Area 2;

[0065] A3: Area 3;

[0066] A4: District 4;

[0067] A5: District 5;

[0068] BS: bottom surface;

[0069] CB: circuit board;

[0070] CBs1: first paragraph;

[0071] CBs2: second section;

[0072] CBs3: third section;

[0073] DP: display panel;

[0074] DS: display surface;

[0075] d1, d2: distance;

[0076] dr: depth;

[0077] EA: light emission area;

[0078] H, H”, Ha, Ha”, Hb, Hb”: height;

[0079] h1, h2, h3, h4, hp: height;

[0080] IL: incident light;

[0081] INS1: first inner surface;

[0082] INS2: second inner surface;

[0083] IS1: first light incident surface;

[0084] IS2: second light incident surface;

[0085] IS3: third light incident surface;

[0086] IS4: fourth incident light surface;

[0087] L, L': light;

[0088] LED, LED1, LED2, LED3: light-emitting elements;

[0089] LS1, LS1-A, LS1-B, LS1-C: primary light source;

[0090] LS2, LS2-A, LS2-B, LS2-C: Second light source;

[0091] LS3: third light source;

[0092] LS4: fourth light source;

[0093] MA: mixed light area;

[0094] OMS, OMS-1, OMS-2, OMS-3, OMS-A, OMS-B, OMS-C, OMS-D, OMS-E, OMS-F, OMS-G, OMS-H, OMS-I, OMS1-J, OMS2-J, OMS-K, OMS-L, OMS1, OMS2: optical microstructure;

[0095] OMSp: convex part;

[0096] OMSp1: Part I;

[0097] OMSp2: Part II;

[0098] OMSr: depression;

[0099] OP: Opening;

[0100] OS: optical surface;

[0101] OS1, OS1a, OS1b, OS1c: first optical surface;

[0102] OS2, OS2a, OS2b, OS2c: second optical surface;

[0103] OS3: third optical surface;

[0104] OS4: fourth optical surface;

[0105] P, P1, P2, P3: pitch;

[0106] RL: reflected light;

[0107] s: spacing;

[0108] SF1e1, SF1e2: edge;

[0109] SF1f, SF1c, SF1x: first surface;

[0110] SF2f, SF2c, SF2x: second surface;

[0111] SMS1, SMS2: surface microstructure;

[0112] SS1, SS2, SS3, SS4, SS5: surface structure;

[0113] SX: axis of symmetry;

[0114] UR: user;

[0115] VES: Virtual Extended Surface;

[0116] W1, W2, W1a, W1b, Wa, Wb, Wk, Wp, Wr, WL: width;

[0117] X, Y, Z: direction;

[0118] θ: angle;

[0119] β1, θ1: first angle;

[0120] β2, θ2: second angle;

[0121] θ3: the third angle;

[0122] θ4: the fourth angle. DETAILED DESCRIPTION

[0123] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0124] The aforementioned technical contents, features, and functions of the present invention will be more clearly demonstrated in the following detailed description of a preferred embodiment with reference to the accompanying drawings. Directional terms such as up, down, left, right, front, and back mentioned in the following embodiments are merely references to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0125] Figure 1A FIG. 1 is a schematic top view of a light source module according to a first embodiment of the present invention. Figure 1B yes Figure 1A Schematic cross-sectional view of a light source module. Figure 2A 、 Figure 2B and Figure 2C yes Figure 1B Schematic cross-sectional views of other modified embodiments of the optical microstructure of the light guide plate. Figures 3A to 3E and Figures 4A to 4D yes Figure 1A Schematic top views of other variant implementations of the light source module. Figure 5 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention.

[0126] Please refer to Figure 1A and Figure 1B , the light source module 10 includes a light guide plate 100, a first light source LS1 and a second light source LS2. The light guide plate 100 has a first surface SF1f and a first light incident surface IS1, a second light incident surface IS2, a first side surface 100s1 and a second side surface 100s2 connected to the first surface SF1f. The first light source LS1 is arranged on one side of the first light incident surface IS1 of the light guide plate 100. The second light source LS2 is arranged on one side of the second light incident surface IS2 of the light guide plate 100. In this embodiment, the first light incident surface IS1 and the second light incident surface IS2 of the light guide plate 100 are opposite to each other, but not limited to this. In another modified embodiment of the light source module 10A (such as Figure 3A As shown), the first light incident surface IS1 and the second light incident surface IS2 of the light guide plate 100 can also be connected to each other, that is, the second light source LS2 is changed to be arranged Figure 1A One side of the first side surface 100s1 of the light guide plate 100 (ie, the first side surface 100s1 serves as the second light incident surface IS2), so the first light incident surface IS1 may be adjacent to the second light incident surface IS2.

[0127] For example, the first light source LS1 and the second light source LS2 may each include a circuit board CB and a plurality of light-emitting elements LED arranged on the circuit board CB. The light-emitting element LED is, for example, a light emitting diode (LED), but is not limited thereto. In the present embodiment, the plurality of light-emitting elements LED of the first light source LS1 may be arranged on the circuit board CB at a single pitch P along a direction parallel to the first light incident surface IS1 (for example, direction Y), and the plurality of light-emitting elements LED of the second light source LS2 may be arranged on the circuit board CB at a single pitch P along a direction parallel to the second light incident surface IS2 (for example, direction Y), but the present invention is not limited thereto. In another variant embodiment of the light source module, the plurality of light-emitting elements LED of the first light source LS1 or the plurality of light-emitting elements LED of the second light source LS2 may be arranged on the circuit board CB at different pitches along a direction (see the subsequent Figure 3D and Figure 3E example).

[0128] Furthermore, the light source module 10 also includes a plurality of optical microstructures OMS arranged on the first surface SF1f of the light guide plate 100. It should be noted first that in order to improve the light output uniformity of the light source module 10 at a wide viewing angle, these optical microstructures OMS are distributed on the first surface SF1f in an uneven manner. In the present embodiment, each of the plurality of optical microstructures OMS can be a protruding structure protruding from the first surface SF1f of the light guide plate 100, but is not limited to this. In other variant embodiments of the light source module, the optical microstructure can be a recessed structure recessed from the first surface SF1f of the light guide plate 100, or the optical microstructure can be a combination of a protruding structure and a recessed structure. In another variant embodiment of the light source module not shown, the plurality of optical microstructures OMS can be changed to be arranged on the second surface SF2f of the light guide plate 100 that is opposite to the first surface SF1f. In addition, Figure 1A The top view shape of the optical microstructure in the embodiment is a circle, but is not limited thereto. In other variant embodiments of the light source module, the top view shape of the optical microstructure may be, for example, an ellipse (e.g. Figure 2A Optical microstructure OMS-1 as shown), meniscus (as Figure 2B The optical microstructure OMS-2 shown in FIG) is provided with a ray-shaped circular shape (such as Figure 2C The optical microstructure OMS-3 shown in the figure may have other suitable shapes. Figure 1A and Figures 2A to 2C Limited.

[0129] Specifically, in this embodiment, the first surface SF1f has a plurality of partitions, such as a first region A1, a second region A2, and a third region A3, and these partitions are arranged along a direction perpendicular to the first light incident surface IS1 or the second light incident surface IS2 (e.g., direction X). That is, the arrangement direction of these partitions is parallel to the normal direction of the first light incident surface IS1 or the second light incident surface IS2. The first region A1 is located between the second region A2 and the third region A3 along the direction X. More specifically, the second region A2 is adjacent to the first light incident surface IS1 and is located between the first region A1 and the first light incident surface IS1. The third region A3 is adjacent to the second light incident surface IS2 and is located between the first region A1 and the second light incident surface IS2.

[0130] In this embodiment, the distribution density of the plurality of optical microstructures OMS in the first area A1 is lower than that in the second area A2 and the third area A3. Accordingly, light leakage from the light source module 10 at the edge of the first surface SF1f of the light guide plate 100 (e.g., the area adjacent to the first light incident surface IS1 and the second light incident surface IS2) at wide viewing angles can be improved, thereby enhancing the uniformity of light output from the light source module 10 at wide viewing angles.

[0131] It is particularly noted that, in other embodiments not shown, the first surface of the light guide plate may have more than three (for example, five) partitions, and the distribution density of the optical microstructure OMS in these partitions will gradually decrease and then gradually increase as the partition moves away from the first light incident surface IS1, or gradually decrease and then gradually increase as the partition moves away from the second light incident surface IS2. In other words, the distribution density of the optical microstructure OMS in the partition closest to the first light incident surface IS1 is higher than the distribution density in the partition second closest to the first light incident surface IS1, and the distribution density of the optical microstructure OMS in the partition closest to the second light incident surface IS2 is higher than the distribution density in the partition second closest to the second light incident surface IS2. More specifically, the distribution density of the optical microstructure OMS first decreases and then increases from the first light incident surface IS1 along the normal direction of the first light incident surface IS1 (or from the second light incident surface IS2 along the normal direction of the second light incident surface IS2).

[0132] However, the present invention is not limited thereto. Figure 3BIn another variant embodiment of the light source module 10B, the first area A1, the second area A2 and the third area A3 of the first surface SF1f can be arranged along a direction (for example, direction Y) parallel to the first light incident surface IS1 or the second light incident surface IS2. That is, the arrangement direction of these partitions is not parallel to (for example, perpendicular to) the normal direction of the first light incident surface IS1 or the second light incident surface IS2. More specifically, the light guide plate 100 further has a first side surface 100s1 and a second side surface 100s2 that connect the first light incident surface IS1 and the second light incident surface IS2 and are opposite to each other. The second area A2 is adjacent to the first side surface 100s1 and is located between the first area A1 and the first side surface 100s1. The third area A3 is adjacent to the second side surface 100s2 and is located between the first area A1 and the second side surface 100s2.

[0133] The distribution density of the multiple optical microstructures OMS in the first area A1 is lower than that in the second area A2 and the third area A3. This can improve light leakage from the light source module 10B at the edge of the first surface SF1f of the light guide plate 100 (e.g., the area adjacent to the first side surface 100s1 and the second side surface 100s2) at wide viewing angles, thereby improving the uniformity of light output from the light source module 10B at wide viewing angles.

[0134] It should be noted that in other embodiments not shown, the first surface of the light guide plate may have three or more (e.g., five) partitions, and the distribution density of the optical microstructures OMS within these partitions gradually decreases and then gradually increases as the partition moves away from the first side 100s1, or gradually decreases and then gradually increases as the partition moves away from the second side 100s2. In other words, the distribution density of the optical microstructures OMS within the partition closest to the first side 100s1 is higher than the distribution density within the partition next closest to the first side 100s1, and the distribution density of the optical microstructures OMS within the partition closest to the second side 100s2 is higher than the distribution density within the partition next closest to the second side 100s2. More specifically, the distribution density of the optical microstructures OMS first decreases and then gradually increases from the first side 100s1 along the normal direction of the first side 100s1 (or from the second side 100s2 along the normal direction of the second side 100s2).

[0135] Please refer to Figure 3C , Figure 3C The light source module 10C and Figure 1AThe difference between the light source module 10 and the light source module 10C is that the light guide plate 100 of the light source module 10C further has a fourth area A4 and a fifth area A5. The first area A1, the fourth area A4, and the fifth area A5 are arranged along the normal direction (e.g., direction Y) of the first side surface 100s1 or the second side surface 100s2, with the first area A1 located between the fourth area A4 and the fifth area A5. More specifically, the fourth area A4 is adjacent to the first side surface 100s1 and between the first area A1 and the first side surface 100s1. The fifth area A5 is adjacent to the second side surface 100s2 and between the first area A1 and the second side surface 100s2.

[0136] The distribution density of the plurality of optical microstructures OMS in the first area A1 is less than the distribution density in any of the second, third, fourth, and fifth areas A5. More specifically, the distribution density of the optical microstructures OMS first decreases and then increases from the first side surface 100s1 along the normal direction of the first side surface 100s1 (or from the second side surface 100s2 along the normal direction of the second side surface 100s2), and first decreases and then increases from the first light incident surface IS1 along the normal direction of the first light incident surface IS1 (or from the second light incident surface IS2 along the normal direction of the second light incident surface IS2). Accordingly, light leakage from the light source module 10C at the edge regions of the first surface SF1f of the light guide plate 100 (e.g., regions adjacent to the first and second light incident surfaces IS1 and IS2, and regions adjacent to the first and second side surfaces 100s1 and 100s2) at wide viewing angles can be improved, thereby enhancing the uniformity of light output from the light source module 10C at wide viewing angles.

[0137] Other embodiments will be listed below to illustrate the present disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the above embodiments and will not be repeated below.

[0138] Please refer to Figure 3D The light source module 10D of this embodiment is Figure 1A The light source module 10 differs only in the configuration of the light sources. Specifically, in the light source module 10C of this embodiment, the circuit boards CB of the first and second light sources LS1-A and LS2-A may each have multiple segments arranged along direction Y, such as a first segment CBs1, a second segment CBs2, and a third segment CBs3. The light-emitting elements may be distributed at different densities within these segments.

[0139] For example, in this embodiment, the second segment CBs2 and the third segment CBs3 may be respectively disposed on opposite sides of the first segment CBs1 along a direction (e.g., direction Y) parallel to the first light-entering surface IS1 or the second light-entering surface IS2, and the distribution density of the light-emitting elements on the second segment CBs2 and the third segment CBs3 may be greater than the distribution density of the light-emitting elements on the first segment CBs1. More specifically, the first light source LS1-A and the second light source LS2-A may each include a plurality of light-emitting elements LED1 disposed on the first segment CBs1, a plurality of light-emitting elements LED2 disposed on the second segment CBs2, and a plurality of light-emitting elements LED3 disposed on the third segment CBs3.

[0140] A plurality of light-emitting elements LED1 are arranged on the first section CBs1 along direction Y at a pitch P1. A plurality of light-emitting elements LED2 are arranged on the second section CBs2 along direction Y at a pitch P2. A plurality of light-emitting elements LED3 are arranged on the third section CBs3 along direction Y at a pitch P3. In this embodiment, pitch P1 may be greater than pitch P2 and pitch P3, and pitch P2 may be the same as or different from pitch P3. For example, the ratio of pitch P1 to pitch P2 (or pitch P3) may be greater than 1 and less than or equal to 5, but is not limited thereto. On the other hand, the one of the plurality of light-emitting elements of each of the first light source LS1-A and the second light source LS2-A that is closest to the edge of the circuit board CB has a spacing s with the edge. Preferably, spacing s may be greater than or equal to 0 and less than or equal to 1.5 mm.

[0141] However, the present invention is not limited to this. In another embodiment (not shown), the distribution density of light-emitting elements in the second and third segments can be smaller than the distribution density of light-emitting elements in the first segment. In other words, the arrangement pitch of light-emitting element LED1 can be smaller than the arrangement pitch of light-emitting elements LED2 and LED3.

[0142] In this embodiment, the distribution of the optical microstructure OMS on the first surface SF1f is similar to Figure 1A Therefore, please refer to the relevant paragraphs of the aforementioned embodiment for detailed description, which will not be repeated here.

[0143] In this embodiment, the second area A2, the first area A1, and the third area A3 of the light guide plate 100 are arranged along the normal direction of the first light incident surface IS1 (e.g., direction X), and the multiple light-emitting elements LED3, the multiple light-emitting elements LED1, and the multiple light-emitting elements LED2 of any one of the first light source LS1-A and the second light source LS2-A2 are arranged along a direction parallel to the first light incident surface IS1 (e.g., direction Y). However, the present invention is not limited thereto. Please refer to Figure 3EIn another modified embodiment of the light source module 10E, the configuration of the first light source LS1-A and the second light source LS2-A is the same as Figure 3D The first light source LS1-A is the same as the second light source LS2-A, but the distribution of the optical microstructure OMS on the first surface SF1f can be the same as Figure 3B The distribution of optical microstructures OMS is similar to that of Figure 3E The third area A3, the first area A1 and the second area A2 of the light guide plate 100 are arranged along a direction (for example, direction Y) parallel to the first light incident surface IS1, and the first area A1, the second area A2 and the third area A3 can be respectively arranged corresponding to the first section CBs1, the second section CBs2 and the third section CBs3 of the circuit board CB along the normal direction (for example, direction X) of the first light incident surface IS1 or the second light incident surface IS2.

[0144] Please refer to Figure 4A The light source module 10F of this embodiment is Figure 1A The difference between the light source module 10 and the light source module 10 is that the composition and configuration of the light source are different. Specifically, a plurality of light sources are arranged on one side of the light incident surface of the light guide plate of the light source module in this embodiment. For example, Figure 4A As shown, in the light source module 10F of this embodiment, two first light sources LS1-B are provided on one side of the first light incident surface IS1 of the light guide plate 100, and two second light sources LS2-B are provided on one side of the second light incident surface IS2. Figure 4A With subsequent Figures 4B to 4D The optical microstructure of the light guide plate 100 is omitted, and Figure 4A With subsequent Figures 4B to 4D The pattern and configuration of the optical microstructures of the light guide plate 100 may be the same as any of the aforementioned embodiments.

[0145] Please refer to Figure 4B The light source module 10G of this embodiment is Figure 1A The difference between the light source modules 10 is that the light source configuration is different. Specifically, Figure 1A The first light source LS1 and the second light source LS2 are arranged opposite to each other, and Figure 4BThe first light source LS1-C and the second light source LS2-C are arranged obliquely to each other. In addition, the first light source LS1-C is arranged only corresponding to a portion of the third side surface 100s3 of the light guide plate 100 (this portion of the third side surface 100s3 serves as the first light incident surface IS1), and the second light source LS2-C is arranged only corresponding to a portion of the fourth side surface 100s4 of the light guide plate 100 (this portion of the fourth side surface 100s4 serves as the second light incident surface IS2). Another portion of the third side surface 100s3 of the light guide plate 100 that is not corresponding to the first light source LS1-C overlaps with the second light source LS2-C in a direction parallel to the normal of the first light incident surface IS1, and another portion of the fourth side surface 100s4 of the light guide plate 100 that is not corresponding to the second light source LS2-C overlaps with the first light source LS1-C in a direction parallel to the normal of the second light incident surface IS2.

[0146] Please refer to Figure 4C The light source module 10H of this embodiment is Figure 4B The difference between the light source module 10G is that the light source configuration is different. Specifically, Figure 4C The light source module 10H further includes a third light source LS3 disposed on one side of the third light incident surface IS3 of the light guide plate 100. Figure 4D The light source module 10I of this embodiment is Figure 4C The differences of the light source module 10H are: Figure 4D The light source module 10I further includes a fourth light source LS4 disposed on one side of the fourth light incident surface IS4 of the light guide plate 100, and the third light incident surface IS3 and the fourth light incident surface IS4 are opposite to each other. In other variant embodiments, Figure 4C and Figure 4D A plurality of light sources may be disposed on one side of the third light incident surface IS3 or the fourth light incident surface IS4.

[0147] It is particularly noted that the distribution of the aforementioned multiple light-emitting elements on the circuit board, the distribution of the multiple optical microstructures on the first surface of the light guide plate, the structure and setting positions of the multiple light sources, and the configuration relationship between these light-emitting elements and these optical microstructures can also be adjusted according to the size of the display product, the brightness of the light source, and the taste requirements of the display quality, and the present invention is not limited to these.

[0148] Furthermore, the light source modules of the aforementioned embodiments are suitable for use as illumination sources for non-self-luminous display panels. Figure 1B and Figure 5The display device 1 includes a display panel DP and a light source module 10. The light guide plate 100 further has a second surface SF2f facing away from the first surface SF1f, and the display panel DP is arranged on one side of the second surface SF2f of the light guide plate 100. The display panel DP is, for example, a reflective liquid crystal display panel, a transflective liquid crystal display panel or an electrophoretic display panel, and its display surface DS is arranged facing the second surface SF2f of the light guide plate 100. That is, the light source module 10 can serve as a front light module of the display device 1. The light L of the first light source LS1 and the second light source LS2 can enter the light guide plate 100 through the first light incident surface IS1 and the second light incident surface IS2 respectively, and then the direction of the light L is adjusted by the optical microstructure OMS to generate incident light IL toward the display panel DP. The incident light IL is reflected by the display panel DP (for example, reflected by the light reflection layer in the reflective or transflective liquid crystal display panel or reflected by the electrophoretic particles in the electrophoretic display panel) to form reflected light RL, and the reflected light RL reaches the eyes of the user UR so that the user UR can see the corresponding picture. It is particularly noted that although Figure 5 The light source module of the display device 1 is exemplified by the aforementioned light source module 10, but is not limited thereto. The light source module of the display device 1 may be any light source module of the aforementioned or subsequent embodiments. Since the light source module as a front light module is located on the side of the display surface of the display panel, the light source module is close to the user, and the optical defects of the light source module (such as light leakage in the edge area of ​​the light guide plate of the light source module) can be easily observed by the user. Therefore, the light source module of the present invention is particularly suitable for use as a front light module to solve the light leakage in the edge area of ​​the light guide plate of the light source module under a wide viewing angle. However, the present invention is not limited thereto. In other embodiments, the display panel may also be, for example, a transmissive liquid crystal display panel, and any of the aforementioned light source modules may be used as a backlight module of the transmissive liquid crystal display panel. That is, the light source module is arranged on the side of the display panel facing away from the display surface to serve as a backlight module.

[0149] Figure 6A is a schematic cross-sectional view of a light source module according to a second embodiment of the present invention. Figures 6B to 6D yes Figure 6A See the cross-sectional diagrams of other variant embodiments of the light source module. Figure 6A The light source module 11 of this embodiment is Figure 1B The light source module 10 differs only in the configuration of the optical microstructures on the first surface. More specifically, in this embodiment, the height h1 of each of the multiple optical microstructures OMS-A along the normal direction (e.g., direction Z) to the first surface SF1f gradually increases and then gradually decreases as it moves away from an edge of the first surface SF1f. In other words, the height h1 of each of the multiple optical microstructures OMS-A gradually increases and then gradually decreases along the normal direction to the first light incident surface IS1 or the second light incident surface IS2.

[0150] For example, the light guide plate 100 may have an edge SF1e1 adjacent to the first light source LS1 and another edge SF1e2 adjacent to the second light source LS2, and the structure height h1 of the optical microstructure OMS-A may first gradually increase and then gradually decrease as it moves away from the edge SF1e1 (or edge SF1e2). That is, at least one of the optical microstructure OMS-A closest to the edge SF1e1 and the optical microstructure OMS-A closest to the edge SF1e2 has the smallest structure height h1, and the optical microstructure OMS-A with the largest structure height h1 is located between the optical microstructure OMS-A closest to the edge SF1e1 and the optical microstructure OMS-A closest to the edge SF1e2.

[0151] With the above configuration, the light uniformity of the light source module 11 at a wide viewing angle can be further improved, and a display device using the light source module 11 can have a better display contrast at a wide viewing angle.

[0152] However, the present invention is not limited thereto. Figure 6B In a modified embodiment of the light source module 12, each of the multiple optical microstructures OMS-B can be a recessed structure recessed from the first surface SF1f, and its structural height h2 will first gradually increase and then gradually decrease as it moves away from the edge SF1e1 (or edge SF1e2) of the first surface SF1f. That is, the structural height h2 of each of the multiple optical microstructures OMS-B will first gradually increase and then gradually decrease along the normal direction of the first light incident surface IS1 or the second light incident surface IS2. More specifically, at least one of the optical microstructure OMS-B closest to the edge SF1e1 and the optical microstructure OMS-B closest to the edge SF1e2 has the smallest structural height h2, and the optical microstructure OMS-B with the largest structural height h2 is located between the optical microstructure OMS-B closest to the edge SF1e1 and the optical microstructure OMS-B closest to the edge SF1e2. Please refer to Figure 6CIn another variant embodiment of the light source module 13, each of the multiple optical microstructures OMS-C can be a protruding structure protruding from the first surface SF1f, and its structural height h3 will first decrease and then increase as it moves away from the edge SF1e1 (or edge SF1e2) of the first surface SF1f. That is, the structural height h3 of each of the multiple optical microstructures OMS-C will first decrease and then increase along the normal direction of the first light incident surface IS1 or the second light incident surface IS2. More specifically, at least one of the optical microstructure OMS-C closest to the edge SF1e1 and the optical microstructure OMS-C closest to the edge SF1e2 has the largest structural height h3, and the optical microstructure OMS-C with the smallest structural height h3 is located between the optical microstructure OMS-C closest to the edge SF1e1 and the optical microstructure OMS-C closest to the edge SF1e2. Please refer to Figure 6D In another variant embodiment of the light source module 14, each of the multiple optical microstructures OMS-D can be a recessed structure recessed from the first surface SF1f, and its structural height h4 will first decrease and then increase as it moves away from the edge SF1e1 (or edge SF1e2) of the first surface SF1f. That is, the structural height h4 of each of the multiple optical microstructures OMS-D will first decrease and then increase along the normal direction of the first light incident surface IS1 or the second light incident surface IS2. More specifically, at least one of the optical microstructure OMS-D closest to the edge SF1e1 and the optical microstructure OMS-D closest to the edge SF1e2 has the largest structural height h4, and the optical microstructure OMS-D with the smallest structural height h4 is located between the optical microstructure OMS-D closest to the edge SF1e1 and the optical microstructure OMS-D closest to the edge SF1e2.

[0153] Figure 7A is a schematic cross-sectional view of a light source module according to a third embodiment of the present invention. Figures 7B to 7C yes Figure 7A See the cross-sectional diagrams of other variant embodiments of the light source module. Figure 7A The light source module 21 of this embodiment is Figure 1B The light source module 10 of this embodiment differs only in the configuration of the first surface of the light guide plate. Specifically, in the light source module 21 of this embodiment, the first surface SF1c of the light guide plate 100 can be a curved surface that is recessed toward the interior of the light guide plate 100 (i.e., an inwardly concave curved surface), while the second surface SF2f can be a flat surface.

[0154] From another perspective, the distance d1 between the first surface SF1c and the second surface SF2f of the light guide plate 100 first decreases and then increases as it moves away from the edge SF1e1 (or edge SF1e2) of the first surface SF1c. In other words, the distance d1 between the first surface SF1c and the second surface SF2f of the light guide plate 100 first decreases and then increases along the normal direction to the first light incident surface IS1 or the second light incident surface IS2. The aforementioned distance d1 is, for example, the distance between the first surface SF1c and the second surface SF2f along the normal direction (e.g., direction Z) to the second surface SF2f.

[0155] In this embodiment, since the first surface SF1c is a concave surface, the ambient light from the first surface SF1c side of the light guide plate 100 can be effectively guided to the display panel (not shown) located on the second surface SF2f side of the light guide plate 100, which helps to improve the overall display brightness.

[0156] However, the present invention is not limited thereto. Figure 7B In a modified embodiment of the light source module 22, the second surface SF2c of the light guide plate 100 may also be a curved surface that is concave toward the interior of the light guide plate 100. That is, the light guide plate 100 of the light source module 22 has a first surface SF1c and a second surface SF2c that are concave toward each other. Because the second surface SF2c is a concave surface of the light guide plate 100, light reflected from the display panel can be directed through the second surface SF2c to a wider viewing angle range, helping to improve the display's visibility at wide viewing angles.

[0157] Please refer to Figure 7C In another variant embodiment of the light source module 23, the second surface SF2x of the light guide plate 100 may be a curved surface that bulges outward from the light guide plate 100 (i.e., an outwardly convex curved surface). Specifically, in addition to the concavely curved first surface SF1c effectively directing ambient light from the first surface SF1c of the light guide plate 100 toward the display panel (not shown) located on the second surface SF2f of the light guide plate 100, light reflected from the display panel can be directed toward the visible area via the convexly curved second surface SF2x, further improving overall display brightness.

[0158] Figure 8A is a schematic cross-sectional view of a light source module according to a fourth embodiment of the present invention. Figures 8B to 8C yes Figure 8A See the cross-sectional diagrams of other variant embodiments of the light source module. Figure 8A The light source module 24 of this embodiment is Figure 1BThe light source module 10 of this embodiment differs only in the configuration of the first surface of the light guide plate. Specifically, in the light source module 24 of this embodiment, the first surface SF1x of the light guide plate 100 can be a curved surface that bulges outward from the light guide plate 100 (i.e., a convex curved surface), while the second surface SF2f can be a flat surface.

[0159] From another perspective, the distance d2 between the first surface SF1x and the second surface SF2f of the light guide plate 100 first increases and then decreases as it moves away from the edge SF1e1 (or edge SF1e2) of the first surface SF1x. In other words, the distance d2 between the first surface SF1x and the second surface SF2f of the light guide plate 100 first increases and then decreases along the normal direction to the first light incident surface IS1 or the second light incident surface IS2. The aforementioned distance d2 is, for example, the distance between the first surface SF1x and the second surface SF2f along the normal direction (e.g., direction Z) to the second surface SF2f.

[0160] In this embodiment, because the first surface SF1x is a convex surface, when at least one of the first light source LS1 and the second light source LS2 is turned on, the light collection efficiency of the light emitted by the light source is improved by deflection by the first surface SF1x. In other words, the generation of wide-angle stray light is reduced, which helps to improve the overall display brightness.

[0161] However, the present invention is not limited thereto. Figure 8B In a modified embodiment of the light source module 25, the second surface SF2x of the light guide plate 100 may also be a curved surface that convexly faces outward from the light guide plate 100. That is, the light guide plate 100 of the light source module 25 has a first surface SF1x and a second surface SF2x that convexly face each other. Because the second surface SF2x is an outwardly convex surface of the light guide plate 100, light reflected from the display panel can be directed toward the viewing area via the convexly curved second surface SF2x, further improving overall display brightness.

[0162] Please refer to Figure 8C In another variant embodiment of the light source module 26, the second surface SF2c of the light guide plate 100 may be a curved surface that is recessed toward the interior of the light guide plate 100 (i.e., a concave surface). Light reflected from the display panel can be directed through the concave second surface SF2c to a wider viewing angle, thereby improving the visibility of the display at a wide viewing angle.

[0163] In particular, Figures 6A to 8C In any of the light source modules, the top view position distribution of the optical microstructures on the first surface can be adjusted according to the size of the display product, the brightness of the light source, and the taste requirements of the display quality, and the present invention is not limited thereto.

[0164] Figure 9is a schematic cross-sectional view of a light source module according to a fifth embodiment of the present invention. 10A to 10D yes Figure 9 See the cross-sectional diagrams of other variant embodiments of the light source module. Figure 9 The light source module 30 of this embodiment is Figure 1B The main difference between the light source module 10 and the light source module 30 of this embodiment lies in the configuration of the optical microstructure. Specifically, in the light source module 30 of this embodiment, the optical microstructure OMS-E can be a recessed structure recessed from the first surface SF1f of the light guide plate 100, and has a first optical surface OS1, a second optical surface OS2, and a bottom surface BS connecting the first optical surface OS1 and the second optical surface OS2.

[0165] For example, in the present embodiment, the cross-sectional profile of each of the first optical surface OS1 and the second optical surface OS2 may be a straight line. The aforementioned cross-section is, for example, a plane perpendicular to the first light incident surface IS1 and the first surface SF1f. In detail, the first surface SF1f has an opening OP that defines each optical microstructure OMS-E, and the first optical surface OS1 and the second optical surface OS2 each extend from the edge of the opening OP to the edge of the bottom surface BS, and the opening OP and the bottom surface BS respectively have a width W1 and a width W2 along the normal direction of the first light incident surface IS1. Preferably, the width W1 may be greater than or equal to the width W2. For example, the width W1 and the width W2 may each be greater than 0 μm and less than or equal to 20 μm, but are not limited thereto.

[0166] On the other hand, the height H of the optical microstructure OMS-E along the normal direction (e.g., direction Z) of the first surface SF1f may be greater than or equal to 0.1 μm and less than or equal to 10 μm, but is not limited thereto. A first angle β1 is defined between the first optical surface OS1 and the virtual extension surface VES of the bottom surface BS. A second angle β2 is defined between the second optical surface OS2 and the bottom surface BS. The second angle β2 is greater than or equal to the first angle β1. Preferably, the first angle β1 and the second angle β2 are each greater than or equal to 40 degrees and less than or equal to 50 degrees.

[0167] In this embodiment, the light source module 30 may include a first light source LS1. A first optical surface OS1 is positioned between the first light incident surface IS1 and the second optical surface OS2. The first optical surface OS1 is configured to reflect light L from the first light source LS1 toward the second surface SF2f. The second optical surface OS2 is configured to reflect light L' that partially penetrates the first optical surface OS1 toward the second surface SF2f. The design of these two optical surfaces significantly improves the light source utilization of the light source module 30. In other words, the output power consumption of the light source module 30 can be reduced.

[0168] However, the present invention is not limited thereto. Figure 10AIn the light source module 30A of the first variant embodiment, the cross-sectional profile of the first optical surface OS1a of the optical microstructure OMS-F may be a broken line (eg Figure 10A The width W1a of the opening OP is greater than the width W2 of the bottom surface BS. Figure 10B In the light source module 30B of the second variant embodiment, in addition to the cross-sectional profile of the first optical surface OS1a of the optical microstructure OMS-G being a broken line, the cross-sectional profile of the second optical surface OS2a can be a combination of a curved line and a straight line, and the width W1b of the opening OP is greater than the width W2 of the bottom surface BS. In other variant embodiments, the cross-sectional profile of the second optical surface OS2a can be a combination of a curved line and a broken line. Please refer to Figure 10C In the light source module 30C of the third variant embodiment, the cross-sectional profile of the first optical surface OS1b of the optical microstructure OMS-H may be curved. Figure 10D In the light source module 30D of the fourth variant embodiment, the cross-sectional profiles of the first optical surface OS1b and the second optical surface OS2b of the optical microstructure OMS-I may be curved.

[0169] Figure 11A is a schematic cross-sectional view of a light source module according to a sixth embodiment of the present invention. Figure 11B yes Figure 11A A cross-sectional view of another variant embodiment of the light source module is shown. Figure 11A The light source module 40 of this embodiment is Figure 9 The main difference between the light source module 30 and the light source module 40 of this embodiment lies in the configuration of the optical microstructure. Specifically, in the light source module 40 of this embodiment, the optical microstructure OMS1-J can be a protruding structure protruding from the first surface SF1f of the light guide plate 100, and has a first optical surface OS1c and a second optical surface OS2c connected to each other. The first optical surface OS1c is located between the first light incident surface IS1 and the second optical surface OS2c.

[0170] In the present embodiment, the cross-sectional profile of the optical microstructure OMS1-J may be triangular, that is, the cross-sectional profiles of the first optical surface OS1c and the second optical surface OS2c are both straight lines. More specifically, the optical microstructure OMS1-J of the present embodiment may be a directional dot arranged on the light guide plate 100. In detail, a first angle θ1 is defined between the first optical surface OS1c and the virtual extension surface VES of the first surface SF1f. A second angle θ2 is defined between the second optical surface OS2c and the virtual extension surface VES of the first surface SF1f. It is particularly noted that the first angle θ1 of the optical microstructure OMS1-J is greater than the second angle θ2. Preferably, the first angle θ1 is greater than or equal to 65 degrees and less than or equal to 85 degrees, and the second angle θ2 is greater than or equal to 35 degrees and less than or equal to 55 degrees, but is not limited thereto.

[0171] On the other hand, the optical microstructure OMS1-J has a height Ha along a normal direction (e.g., direction Z) to the first surface SF1f and a width Wa along a normal direction to the first light incident surface IS1. Preferably, the height Ha of the optical microstructure OMS1-J may be greater than or equal to 0.1 μm and less than or equal to 10 μm, and its width Wa may be greater than or equal to 5 μm and less than or equal to 30 μm, but the present invention is not limited thereto. For example, the ratio of the width Wa to the height Ha of the optical microstructure OMS1-J may be greater than or equal to 2 and less than or equal to 7.

[0172] However, the present invention is not limited thereto. Figure 11B In a modified embodiment of the light source module 40A, the optical microstructure OMS2-J may be a recessed structure recessed from the first surface SF1f of the light guide plate 100, and may have a third optical surface OS3 and a fourth optical surface OS4 connected to each other. The third optical surface OS3 is located between the first light incident surface IS1 and the fourth optical surface OS4. The cross-sectional profile of the optical microstructure OMS1-J may be triangular, that is, the cross-sectional profiles of the third optical surface OS3 and the fourth optical surface OS4 are both straight lines. More specifically, the optical microstructure OMS2-J of the modified embodiment may be a directional dot provided on the light guide plate 100. In detail, a third angle θ3 is formed between the third optical surface OS3 and the virtual extension surface VES of the first surface SF1f. A fourth angle θ4 is formed between the fourth optical surface OS4 and the virtual extension surface VES of the first surface SF1f. It is particularly noted that the third angle θ3 of the optical microstructure OMS2-J is smaller than the fourth angle θ4. Preferably, the third angle θ3 is greater than or equal to 35 degrees and less than or equal to 55 degrees, and the fourth angle θ4 is greater than or equal to 65 degrees and less than or equal to 85 degrees, but not limited thereto.

[0173] On the other hand, the optical microstructure OMS2-J has a height Hb along a normal direction (e.g., direction Z) to the first surface SF1f and a width Wb along a normal direction to the first light incident surface IS1. Preferably, the height Hb of the optical microstructure OMS2-J may be greater than or equal to 0.1 μm and less than or equal to 10 μm, and its width Wb may be greater than or equal to 5 μm and less than or equal to 30 μm, but the present invention is not limited thereto. For example, the ratio of the width Wb to the height Hb of the optical microstructure OMS2-J may be greater than or equal to 2 and less than or equal to 7.

[0174] Figure 12 is a schematic cross-sectional view of a light source module according to a seventh embodiment of the present invention. Figure 13A yes Figure 12 A cross-sectional schematic diagram of another modified embodiment of the light source module. Figure 13B yes Figure 13A An enlarged schematic diagram of a local area of ​​a light source module.

[0175] Please refer to Figure 12 The light source module 10E of this embodiment is Figure 1B The difference between the light source module 10 and the light source module 10E lies in the different configuration of the optical microstructures. Specifically, in this embodiment, the light source module 10E may include a plurality of optical microstructures OMS1 protruding from the first surface SF1f of the light guide plate 100 and a plurality of optical microstructures OMS2 recessed from the first surface SF1f of the light guide plate 100. These optical microstructures OMS1 are spaced apart from these optical microstructures OMS2. That is, adjacent optical microstructures OMS1 and optical microstructures OMS2 are spaced apart in the normal direction of the first light incident surface IS1 (part of the first surface SF1f is located between adjacent optical microstructures OMS1 and optical microstructures OMS2).

[0176] It is particularly noted that the configuration of the optical microstructures OMS1 and OMS2 can enhance the brightness of light emitted by the light source module 10E on the second surface SF2f, and the design of the optical microstructure OMS1 can reduce the impact of the overall optical microstructure on the visual quality of the display image.

[0177] For example, in this embodiment, the optical microstructures OMS1 and the optical microstructures OMS2 may be alternately arranged on the first surface SF1f along the normal direction of the first light incident surface IS1. However, the present invention is not limited thereto. In other embodiments not shown, the number of optical microstructures OMS1 and OMS2 and the manner of their alternating arrangement may be adjusted to meet different optical performance requirements, and the present invention is not limited thereto.

[0178] In another variant embodiment, Figure 12The optical microstructure OMS1 and the optical microstructure OMS2 can be respectively Figure 11A The optical microstructure OMS1-J and Figure 11B The optical microstructure OMS2-J is replaced by Figure 13A and Figure 13B The light source module 10F is shown.

[0179] Figure 14 is a cross-sectional view of a light source module according to an eighth embodiment of the present invention. Figure 14 The light source module 50 of this embodiment is Figure 12 The main difference between the light source module 10E and the light source module 10E is that the configuration of the optical microstructure is different. Specifically, in this embodiment, the multiple optical microstructures OMS-K of the light source module 50 can each have a recessed portion OMSr recessed from the first surface SF1f and a raised portion OMSp raised from the first surface SF1f. It is particularly noted that, unlike Figure 12 The optical microstructures OMS1 and OMS2 are arranged at intervals, and the recessed portion OMSr and the raised portion OMSp of the optical microstructure OMS-K of this embodiment are arranged adjacent to each other. That is, there is no spacing between the recessed portion OMSr and the raised portion OMSp, and a single dot with a concave-convex structure is formed.

[0180] In detail, the recessed portion OMSr and the raised portion OMSp have a depth dr and a height hp respectively along the normal direction of the first surface SF1f. Preferably, the depth dr of the recessed portion OMSr is greater than or equal to the height hp of the raised portion OMSp, and the depth dr is less than or equal to 10 μm. On the other hand, the optical microstructure OMS-K has a width Wk along the normal direction of the first light incident surface IS1, and the recessed portion OMSr and the raised portion OMSp have a width Wr and a width Wp respectively along the normal direction of the first light incident surface IS1. The width Wr of the recessed portion OMSr and the width Wp of the raised portion OMSp may be equal or unequal. Preferably, the width Wk of the optical microstructure OMS-K may be less than or equal to 60 μm, and the ratio of the width Wk to the depth dr may be greater than or equal to 1 and less than or equal to 60.

[0181] Figure 15 is a cross-sectional view of a light source module according to a ninth embodiment of the present invention. Figure 15 The light source module 60 of this embodiment is Figure 1BThe light source module 10 differs from the light source module 60 of this embodiment in the configuration of the optical microstructures. Specifically, in the light source module 60 of this embodiment, each of the multiple optical microstructures OMS-L includes a first portion OMSp1 and a second portion OMSp2. The optical microstructures OMS-L are formed by stacking the first and second portions OMSp1 and OMSp2 along a normal direction (e.g., direction Z) to the first surface SF1f. More specifically, the first portion OMSp1 connects the first surface SF1f and the second portion OMSp2.

[0182] It is particularly noteworthy that the first portion OMSp1 is symmetrically arranged along the symmetry axis SX perpendicular to the first surface SF1f, while the second portion OMSp2 is asymmetrically arranged along the symmetry axis SX. For example, in the present embodiment, the first portion OMSp1 can be a semicircular or quasi-semicircular symmetrical dot, and the second portion OMSp2 can be a directional dot. In detail, the optical microstructure OMS-L has a height H" along the normal direction of the first surface SF1f, and its first portion OMSp1 and second portion OMSp2 have a height Ha" and a height Hb respectively along the normal direction of the first surface SF1f. Preferably, the height H" of the optical microstructure OMS-L can be greater than or equal to 0.1μm and less than or equal to 10μm, and the ratio of the height Ha" of the first portion OMSp1 to the height Hb" of the second portion OMSp2 can be greater than or equal to 0.1 and less than or equal to 1.

[0183] On the other hand, the second portion OMSp2 has an optical surface OS facing the first light incident surface IS1, and an angle θ is formed between the optical surface OS and a virtual plane parallel to the first surface SF1f. Preferably, the angle θ is greater than or equal to 35 degrees and less than or equal to 55 degrees. The optical microstructure OMS-L has a width WL along the normal direction of the first light incident surface IS1, and the width WL is greater than or equal to 5 μm and less than or equal to 30 μm.

[0184] Figure 16A FIG. 1 is a perspective schematic diagram of a light guide plate according to an embodiment of the present invention. Figures 16B to 16E yes Figure 16A Please refer to the three-dimensional schematic diagram of other modified embodiments of the light guide plate. Figure 16A , in order to make the light source (such as Figure 1BIn order to make the light emitted by the first light source LS1 shown in the figure more uniform in its optical path distribution after passing through the first light incident surface IS1, a plurality of surface structures SS1 may be provided on the first light incident surface IS1 of the light guide plate 100, and these surface structures SS1 are, for example, a plurality of cylindrical lens structures. For example, these cylindrical lens structures may be arranged along a direction parallel to the first light incident surface IS1 and the first surface SF1f, and each of these cylindrical lens structures extends in a normal direction to the first surface SF1f. However, the present invention is not limited to this. In other modified embodiments not shown, a plurality of cylindrical lens structures may be arranged along a normal direction to the first surface SF1f, and each of these cylindrical lens structures extends in a direction parallel to the first light incident surface IS1 and the first surface SF1f.

[0185] However, the present invention is not limited thereto. Figure 16B In a modified embodiment, a surface structure SS2 may be provided on the first light incident surface IS1 of the light guide plate 100, and the surface structure SS2 may be, for example, a lens structure. The lens structure may be a concave lens structure that is recessed from the first light incident surface IS1 toward the light guide plate 100, but is not limited thereto. In a modified embodiment not shown, the lens structure may be a convex lens structure that is convex from the first light incident surface IS1 toward a direction away from the light guide plate 100. Please refer to Figure 16C and Figure 16D , Figure 16C and Figure 16D They are respectively the modified implementation methods of the concave lens structure and the convex lens structure. Figure 16C In the embodiment, a surface structure SS3 is provided on the first light incident surface IS1, and the surface structure SS3 is, for example, a concave lens structure that is recessed from the first light incident surface IS1 toward the light guide plate 100. Figure 16D In FIG, a surface structure SS4 is provided on the first light incident surface IS1, and the surface structure SS4 is, for example, a convex lens structure protruding from the first light incident surface IS1 toward a direction away from the light guide plate 100. Figure 16E In another modified embodiment, a plurality of surface structures SS5 are provided on the first light incident surface IS1 , and these surface structures SS5 are, for example, a plurality of pyramid structures protruding from the first light incident surface IS1 . Figure 16E The pyramid structure of the surface structure SS5 is taken as a quadrangular pyramid structure for example, but the present invention is not limited thereto.

[0186] In the aforementioned 16A to 16EIn the embodiment, the first light incident surface IS1 is structured to change the path of light incident from the light-emitting element onto the first light incident surface IS1, thereby uniformly diffusing the light. However, the present invention is not limited to this embodiment. In a variant embodiment (not shown), the first light incident surface IS1 can be roughened to form a roughened light incident surface, thereby uniformly diffusing the light incident from the light-emitting element onto the first light-emitting surface IS1. Furthermore, in some variant embodiments, the first light incident surface IS1 can be structured and roughened.

[0187] Figure 17A FIG. 1 is a schematic top view of a light source module according to a tenth embodiment of the present invention. Figure 17B yes Figure 17A Schematic cross-sectional view of a light source module. Figure 17C and Figure 17D yes Figure 17A Schematic top view of other variant embodiments of the light source module. It should be noted that for the sake of clarity, 17A to 17D The light guide plate 100 is omitted. Figure 1A The optical microstructure OMS is shown distributed on the first surface SF1f.

[0188] Please refer to Figure 17A and Figure 17B , compared to Figure 1A The light source module 10 of the light source module 71 of this embodiment further has a light mixing area MA and a light emitting area EA. The light mixing area MA is located between the light emitting area EA and the first light incident surface IS1, and is adjacent to the first light incident surface IS1. The light L generated by the multiple light-emitting elements LED of the first light source LS1 is mixed in the light mixing area MA to generate uniform light and enter the light emitting area EA. It is particularly noteworthy that the light guide plate 100 may be provided with at least one hole between the light emitting area EA and the first light incident surface IS1. For example, in this embodiment, the light guide plate 100 may be provided with a plurality of holes 100h1 overlapping the light mixing area MA and the light emitting area EA. The orthographic projection contour of each of these holes 100h1 on the first surface SF1f is circular, and these holes 100h1 may be radially distributed corresponding to each light-emitting element LED of the first light source LS1. The arrangement of these holes 100h1 can further refract or reflect the light from the first light incident surface IS1 to produce a change in the light path, so that the light emitted by the first light source LS1 can have a more uniform light path distribution when entering the light exit area EA. Figure 17B The cross-sectional view of the hole 100h1 is merely an example, and the cross-sectional shape of the hole 100h1 of the present invention is not limited thereto. For example, the hole may be completely located in the light guide plate 100 and not penetrate the light guide plate 100, that is, the hole may be completely covered by the light guide plate 100.

[0189] However, the present invention is not limited thereto. Figure 17CIn a modified embodiment of the light source module 72, the plurality of holes 100h2 on the light guide plate 100 are each provided corresponding to a light emitting element LED, and the orthographic projection profile of each hole on the first surface SF1f may be polygonal (e.g., trapezoidal), but not limited thereto. In a modified embodiment not shown, the orthographic projection profile of the hole on the first surface may be triangular. Please refer to Figure 17D In another modified embodiment of the light source module 73 , the orthographic projection profile of each of the plurality of holes 100h3 on the light guide plate 100 on the first surface SF1f may be wavy.

[0190] It is particularly important to note that due to the range of the light output angle of the light emitting element LED and the light output intensity distribution within the range of the light output angle, Figure 17A 、 Figure 17C and Figure 17D Dark areas are easily formed in the partial area between two adjacent light-emitting elements LED corresponding to the first light source LS1 in the area near the first light incident surface IS1 of the middle light guide plate 100. Therefore, by forming a sparse and dense distribution of the aforementioned multiple holes in the light mixing area MA and the partial light output area EA, it can effectively improve the hot spot phenomenon in which multiple light-emitting elements LED generate multiple bright areas and multiple dark areas alternatingly arranged in the area near the first light incident surface IS1 of the light guide plate 100.

[0191] Figure 18A is a schematic top view of a light source module according to an eleventh embodiment of the present invention. Figure 18B yes Figure 18A A schematic top view of another modified embodiment of the light source module. Figure 19A yes Figure 18A or Figure 18B An enlarged schematic diagram of the hole of the light guide plate. Figures 19B to 19D yes Figure 19A Schematic top view of other modified embodiments of the hole.

[0192] Please refer to Figure 18A , different from 17A to 17C In the embodiment of the present embodiment, the light guide plate 100 of the light source module 81 is provided with a hole 100h4. The hole 100h4 is, for example, a strip hole extending parallel to the first light incident surface IS1 and disposed within the light mixing area MA. However, the present invention is not limited thereto. In a modified embodiment of the light source module 82, the number of strip holes on the light guide plate 100 can be multiple, such as Figure 18B There are two holes 100h5 shown, and the two holes 100h5 correspond to the two light-emitting elements LED of the first light source LS1 respectively.

[0193] Furthermore, the light guide plate 100 also has a definition Figure 18A Holes 100h4 or Figure 18BThe first inner surface INS1 and the second inner surface INS2 of the hole 100h5 are particularly noted to be provided with a plurality of surface microstructures on at least one of the first inner surface INS1 and the second inner surface INS2. For example, the plurality of surface microstructures SMS1 may be provided only on the first inner surface INS1 of the hole 100h4 or the hole 100h5 (e.g., Figure 19A ), or is provided on the first inner surface INS1 and the second inner surface INS2 of the hole 100h4 or the hole 100h5 (as shown in FIG. Figure 19B shown), or is only provided on the second inner surface INS2 (not shown).

[0194] exist Figure 19A and Figure 19B In the embodiment, the surface microstructure SMS1 may be a protruding structure protruding from the first inner surface INS1 or the second inner surface INS2, but is not limited thereto. In a modified embodiment, the surface microstructure SMS2 on the second inner surface INS2 may be a concave structure concave from the second inner surface INS2 (e.g., Figure 19C As shown), or the surface microstructures SMS2 provided on the first inner surface INS1 and the second inner surface INS2 are all recessed structures recessed from the first inner surface INS1 or the second inner surface INS2 (as shown Figure 19D As shown), or the surface microstructures provided on the first inner surface INS1 and the second inner surface INS2 are respectively a concave structure recessed from the first inner surface INS1 and a convex structure protruding from the second inner surface INS2 (not shown). Figure 19A In a modified embodiment, the surface microstructure may be a concave structure (not shown) provided only on the first inner surface INS1 and recessed from the first inner surface INS1, or the surface microstructure may be a concave structure (not shown) provided only on the second inner surface INS2 and recessed from the second inner surface INS2 or a protruding structure (not shown) protruding from the second inner surface INS2. In the above description, the concave structure recessed from the first inner surface 1 is a concave structure recessed from the first inner surface INS1 in a direction away from the second inner surface INS2, the protruding structure protruding from the first inner surface 1 is a concave structure protruding from the first inner surface INS1 in a direction toward the second inner surface INS2, the concave structure recessed from the second inner surface INS2 is a concave structure recessed from the second inner surface INS2 in a direction away from the first inner surface 1, and the protruding structure protruding from the second inner surface INS21 is a concave structure protruding from the second inner surface INS2 in a direction toward the first inner surface 1.

[0195] By providing the aforementioned strip-shaped holes and multiple surface microstructures on at least one inner surface of the strip-shaped holes in the light mixing area MA, the hot spot phenomenon in which multiple light-emitting elements LED generate multiple bright areas and multiple dark areas alternatingly arranged in the area near the first light incident surface IS1 of the light guide plate 100 can be effectively improved.

[0196] In summary, in a light source module according to one embodiment of the present invention, a light guide plate is provided with a plurality of optical microstructures on a first surface connected to the first light incident surface. These optical microstructures have different distribution densities in the first and second regions of the first surface. This improves the uniformity of light output from the light source module at wide viewing angles.

[0197] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light source module, characterized in that: include: A light guide plate having a first light incident surface, a first side surface, and a first surface, wherein the first light incident surface and the first side surface are connected to the first surface, the first surface of the light guide plate having a first area and a second area, the second area being located between the first light incident surface, the first side surface, and the first area; a first light source, disposed on one side of the first light incident surface of the light guide plate; as well as a plurality of optical microstructures disposed on the first surface; The distribution density of the plurality of optical microstructures in the first region is smaller than that in the second region.

2. The light source module according to claim 1, wherein: Also includes: A second light source is arranged on one side of the second light incident surface of the light guide plate, the first light incident surface and the second light incident surface are opposite to or connected to each other, wherein the first surface of the light guide plate also has a third area, the first area is located between the second area and the third area, and the distribution density of the multiple optical microstructures in the third area is greater than the distribution density in the first area.

3. The light source module according to claim 1, wherein: The first light source includes a plurality of first light-emitting elements and a plurality of second light-emitting elements, and the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged along a direction parallel to the first light incident surface, wherein the plurality of first light-emitting elements are arranged according to a first pitch, and the plurality of second light-emitting elements are arranged according to a second pitch, and the first pitch is greater than the second pitch.

4. The light source module according to claim 1, wherein: The multiple optical microstructures are recessed or protruding from the first surface, and each has a structure height along the normal direction of the first surface. The structure height of each of the multiple optical microstructures first increases and then decreases, or first decreases and then increases as it moves away from the edge of the first surface.

5. The light source module according to claim 1, wherein: The light guide plate further has a second surface connected to the first light incident surface, the second surface faces away from the first surface, and at least one of the first surface and the second surface is a curved surface.

6. The light source module according to claim 5, wherein: The distance between the first surface and the second surface first increases and then decreases, or first decreases and then increases, as the distance moves away from the edge of the first surface.

7. The light source module according to claim 5, wherein: One of the first surface and the second surface is a concave curved surface, and the other of the first surface and the second surface is a convex curved surface.

8. The light source module according to claim 1, wherein: The multiple optical microstructures are recessed from the first surface, and each has a first optical surface, a second optical surface, and a bottom surface connecting the first optical surface and the second optical surface, a first angle is formed between the first optical surface and a virtual extension surface of the bottom surface, a second angle is formed between the second optical surface and the bottom surface, the second angle is greater than or equal to the first angle, and the first angle and the second angle are each greater than or equal to 40 degrees and less than or equal to 50 degrees.

9. The light source module according to claim 8, wherein: The first surface has an opening defining each of the plurality of optical microstructures. The opening and the bottom surface respectively have a first width and a second width along a normal direction of the first light incident surface, and the first width is greater than or equal to the second width.

10. The light source module according to claim 8, wherein The cross-sectional profile of each of the first optical surface and the second optical surface is a straight line, a curved line, a broken line, or a combination of a straight line and a curved line.

11. The light source module according to claim 1, wherein: The plurality of optical microstructures include a plurality of first optical microstructures protruding from the first surface and a plurality of second optical microstructures recessed from the first surface, and the plurality of first optical microstructures are spaced apart from the plurality of second optical microstructures.

12. The light source module according to claim 11, wherein: Each of the multiple first optical microstructures has a first optical surface and a second optical surface connected to each other, the first optical surface is located between the first light incident surface and the second optical surface, a first angle is formed between the first optical surface and the virtual extension surface of the first surface, a second angle is formed between the second optical surface and the virtual extension surface, and the first angle is greater than the second angle, and each of the multiple second optical microstructures has a third optical surface and a fourth optical surface connected to each other, the third optical surface is located between the first light incident surface and the fourth optical surface, a third angle is formed between the third optical surface and the virtual extension surface, a fourth angle is formed between the fourth optical surface and the virtual extension surface, and the third angle is less than the fourth angle.

13. The light source module according to claim 1, wherein: The multiple optical microstructures protrude from the first surface and each have a first optical surface and a second optical surface connected to each other. The first optical surface is located between the first light incident surface and the second optical surface. A first angle is formed between the first optical surface and a virtual extension surface of the first surface. A second angle is formed between the second optical surface and the virtual extension surface, and the first angle is greater than the second angle.

14. The light source module according to claim 1, wherein: The multiple optical microstructures are recessed from the first surface and each have a third optical surface and a fourth optical surface connected to each other. The third optical surface is located between the first light incident surface and the fourth optical surface. A third angle is formed between the third optical surface and a virtual extension surface of the first surface. A fourth angle is formed between the fourth optical surface and the virtual extension surface, and the third angle is smaller than the fourth angle.

15. The light source module according to claim 1, wherein Each of the multiple optical microstructures has a recessed portion recessed from the first surface and a raised portion raised from the first surface, wherein the recessed portion and the raised portion have a depth and a height respectively along the normal direction of the first surface, and the depth of the recessed portion is greater than or equal to the height of the raised portion.

16. The light source module according to claim 1, wherein: Each of the plurality of optical microstructures has a first portion and a second portion, the first portion connects the first surface and the second portion, the first portion is symmetrically arranged along a symmetry axis perpendicular to the first surface, and the second portion is asymmetrically arranged along the symmetry axis.

17. The light source module according to claim 1, wherein: The first light incident surface is provided with at least one surface structure, and the at least one surface structure includes a cylindrical lens structure, a lens structure or a pyramid structure.

18. The light source module according to claim 1, wherein The light guide plate is provided with at least one hole.

19. The light source module according to claim 18, wherein: The orthographic projection contour of the at least one hole on the first surface is wavy, circular or polygonal.

20. The light source module according to claim 18, wherein The at least one hole is a strip hole extending parallel to the first light incident surface. The light guide plate further has a first inner surface and a second inner surface defining the strip hole. At least one of the first inner surface and the second inner surface is provided with a plurality of surface microstructures.

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