Light guide plate and light source module applying same

Abstract

The light guide plate comprises a light guide plate body and a first microstructure, the light incident surface of the light guide plate body is connected with a first surface, and the first microstructure is formed on the first surface. The first microstructure comprises a microstructure cambered surface arranged close to the light incident surface, a microstructure surface arranged on the opposite surface of the microstructure cambered surface and two side planes, the microstructure cambered surface is a part of a cylindrical surface, and the two side planes are respectively arranged on two opposite sides of the first microstructure and are respectively connected with the microstructure cambered surface, the microstructure surface and the first surface; the micro-structure cambered surface and the micro-structure surface extend in the direction away from the first surface, the micro-structure cambered surface and the micro-structure surface intersect and are connected to form an arc part, and by means of the design of the first micro-structure, part of light beams are reserved in the light guide plate so as to improve the contrast ratio of reading illumination and images.

Description

Technical Field

[0001] The present application relates to a structure used in a reflective liquid crystal display, and more particularly to a light guide plate and a light source module used therein. Background Art

[0002] When a reflective LCD is used in a dark environment or an environment with insufficient light, an additional light source element (such as a front light film set) can be used as auxiliary lighting. The aforementioned light source element will illuminate the reading surface of the reflective LCD, thereby improving the readability of the display screen.

[0003] The existing reflective liquid crystal display includes a front light film group, which has a light-emitting element and a light guide plate. The light-emitting element is arranged on the side of the light guide plate to guide the light beam downward to illuminate the reading surface through the light guide plate, and the light beam is then reflected to the reader's eyes.

[0004] When the light beam is reflected or refracted on the upper surface of the light guide plate, some stray light will be generated which is directly emitted from the upper surface of the light guide plate.

[0005] However, the stray light generated by the light guide plate is not only unhelpful for reading illumination, but also easily causes glare to the reader and reduces the contrast of the image.

[0006] Therefore, the prior art is indeed in need of further providing more improved solutions.

[0007] The "Background Technology" section is only used to help understand the content of the utility model. Therefore, the content disclosed in the "Background Technology" section may contain some known technologies that are not known to technicians in the relevant technical field. The content disclosed in the "Background Technology" section does not mean that the content or the problems to be solved by one or more embodiments of the utility model have been known or recognized by technicians in the relevant technical field before the application of the utility model. Utility Model Content

[0008] In view of the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to design a light guide plate to reduce the emission of stray light, thereby achieving the purpose of improving reading lighting and image contrast.

[0009] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0010] In order to achieve one or part or all of the above-mentioned purposes or other purposes, the technical means adopted by the utility model are mainly to make the light guide plate include: a light guide plate body, having a light incident surface and a first surface, the light incident surface is connected to the first surface; a first microstructure, formed on the first surface, and the first microstructure includes: a microstructure arc surface, arranged close to the light incident surface, the microstructure arc surface is a part of a cylindrical surface; a microstructure surface, arranged away from the light incident surface, and arranged on the opposite side of the microstructure arc surface; and two side planes, respectively arranged on two opposite sides of the first microstructure, and the two side surfaces are respectively connected to the microstructure arc surface, the microstructure surface and the first surface; wherein the microstructure arc surface and the microstructure surface respectively extend in a direction away from the first surface, and the microstructure arc surface and the microstructure surface intersect and connect to form an arc portion.

[0011] With the above-mentioned light guide plate, when the light beam passes through the microstructure curved surface, it is refracted toward the microstructure surface, and through the refraction of the microstructure surface, the light beam is retained in the light guide plate and does not emit out of the first surface. In this way, part of the light beam can be retained in the light guide plate to improve reading lighting.

[0012] To achieve the above object, another technical means adopted by the present invention is mainly to make the light source module include: a light guide plate as mentioned above; and a light emitting element, which is arranged on one side of the light incident surface of the light guide body.

[0013] With the help of the above-mentioned light source module, when the light emitting element emits a light beam, the light beam will pass through the microstructure arc surface and refract toward the microstructure surface, and through the refraction of the microstructure surface, the light beam will be retained in the light guide plate and will not be emitted from the first surface. In this way, part of the light beam can be retained in the light guide plate to enhance reading lighting, and part of the light beam will also be reflected in the light guide plate and shine downward on the image, thereby improving the contrast of the image. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 It is a partial top view of the first embodiment of the light guide plate of the utility model.

[0016] Figure 2 It is a cross-sectional view taken along line AA of the first embodiment of the light guide plate of the present invention.

[0017] Figure 3It is a top view of the first microstructure of the utility model from another perspective.

[0018] Figure 4 It is a cross-sectional view of the first microstructure of the present invention along the line BB.

[0019] Figure 5 It is a front view of the first microstructure of the utility model.

[0020] Figure 6 It is a rear view of the first microstructure of the utility model.

[0021] Figure 7 It is a bottom view of the first microstructure of the utility model.

[0022] Figure 8 It is a schematic diagram of light beam reflection and refraction of the first embodiment of the light guide plate of the utility model.

[0023] Fig. 9 It is a partial top view of the second embodiment of the light guide plate of the utility model.

[0024] Fig.10 It is a side perspective view of a second embodiment of the light guide plate of the utility model.

[0025] Fig.11 It is a partial top view of a third embodiment of the light guide plate of the present invention.

[0026] Fig.12 It is an enlarged view of the C area of ​​the third embodiment of the light guide plate of the utility model.

[0027] Fig.13 It is a side view of the light source module of the utility model.

[0028] Description of reference numerals:

[0029] 10, 10', 10": Light guide plate

[0030] 11: Light guide plate

[0031] 110: Light incident surface

[0032] 111: First surface

[0033] 12: First microstructure

[0034] 120: Microstructured curved surface

[0035] 121: Microstructured surface

[0036] 122: Two side planes

[0037] 123: Arc

[0038] 124: Groove

[0039] 125: Front groove wall

[0040] 126: Rear groove wall

[0041] 127: Two opposite side walls

[0042] 13: Second microstructure

[0043] 131: Anterior wall

[0044] 132: Back wall

[0045] 20 light source modules:

[0046] 21: Light-emitting element

[0047] θ1: first angle

[0048] θ2: Second angle

[0049] θ3: third angle, θ4: fourth angle, θ5: fifth angle, θ6: sixth angle, θ7: angle

[0050] W1: First surface width

[0051] L1: slot length

[0052] d1: set distance

[0053] E1: First Area

[0054] E2: Second Area

[0055] S: blank area

[0056] D1: First arrangement direction

[0057] D2: Second arrangement direction

[0058] B1, B2, B3: Marking

[0059] L2: Length distance

[0060] H: Height DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. The above-mentioned other technical contents, features and functions of the utility model will be clearly presented in the following detailed description of a preferred embodiment with reference to one of the drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the utility model.

[0062] Figure 1 It is a partial top view of the first embodiment of the light guide plate of the utility model. Figure 2 FIG. 2 is a cross-sectional view of the first embodiment of the light guide plate of the present invention taken along line AA, where AA is, for example, a symmetric plane of a single first microstructure. Figure 1 and Figure 2 As shown, the light guide plate 10 includes a light guide plate body 11 and a first microstructure 12. The light guide plate body 11 has a light incident surface 110 and a first surface 111, the light incident surface 110 is connected to the first surface 111, and the first microstructure 12 is formed on the first surface 111. The first microstructure 12 is, for example, a concave microstructure. The first microstructure 12 includes a microstructure arc surface 120, a microstructure surface 121 and two side planes 122. The microstructure arc surface 120 is arranged close to the light incident surface 110. The microstructure arc surface 120 is, for example, a part of a cylindrical surface, and the microstructure surface 121 is arranged away from the light incident surface 110. That is, as shown in FIG. Figure 2 As shown, the microstructure curved surface 120 is disposed between the light incident surface 110 and the microstructure surface 121. In addition, the microstructure surface 121 is disposed on the opposite side of the microstructure curved surface 120. The microstructure surface 121 is, for example, a part of a cylindrical surface, and the two side planes 122 are respectively disposed on two opposite sides of the first microstructure 12, and the two side planes 122 are respectively connected to the microstructure curved surface 120, the microstructure surface 121 and the first surface 111. Figure 2 In the embodiment, the distance between the intersection of the microstructure arc surface 120 and the first surface 111 and the intersection of the microstructure surface 121 and the first surface 111 is the first surface width W1, wherein the microstructure arc surface 120 and the microstructure surface 121 extend in a direction away from the first surface 111, and the microstructure arc surface 120 and the microstructure surface 121 intersect and connect to form an arc portion 123 (indicated at Figure 7 ).

[0063] With the above-mentioned light guide plate 10, when the light beam is transmitted to the microstructure curved surface 120, most of the light beam is reflected by the microstructure curved surface 120 and transmitted toward the light guide plate 10, and another part of the light beam is refracted by the microstructure curved surface 120 and transmitted toward the microstructure surface 121, and then refracted by the microstructure surface 121, so that the light beam is retained in the light guide plate 10 and will not be directly transmitted to the user.

[0064] On the other hand, Figure 2 In the embodiment, there is a first angle θ1 between the first surface 111 and the microstructure curved surface 120, and there is a second angle θ2 between the first surface 111 and the microstructure surface 121, and the first angle θ1 is smaller than the second angle θ2. Specifically, the first angle θ1 is greater than or equal to 30 degrees and less than or equal to 40 degrees. The second angle θ2 is greater than or equal to 80 degrees and less than or equal to 90 degrees.

[0065] Figure 3 It is a top view of the first microstructure of the utility model from another perspective. Figure 4 is a cross-sectional view of the first microstructure of the present invention taken along line BB, where line BB is, for example, perpendicular to line AA and passes through two side planes. It is particularly noted that in the present invention, the first microstructure is, for example, a concave microstructure, but in order to clearly indicate the specific shape of the microstructure, some of the first microstructures shown in the figure are depicted as a three-dimensional structure. In this embodiment, Figure 3 and Figure 4 As shown, each of the two side planes 122 is, for example, a plane and each is triangular. The third angle θ3 and the fourth angle θ4 between each of the two side planes 122 and the first surface 111 are, for example, greater than or equal to 60 degrees and less than or equal to 85 degrees. The intersection line between each of the two side planes 122 and the first surface 111 is, for example, perpendicular to the light incident surface 110.

[0066] Specifically, a specific embodiment of the first microstructure 12 is as follows: Figure 5 , Figure 6 and Figure 7 As shown, the first microstructure 12 is recessed and extends from the first surface 111 toward the bottom of the light guide plate body 11 to form a groove 124, the microstructure arc surface 120 is protruded toward the light incident surface 110 to form a front groove wall 125 of the groove 124, and the microstructure surface 121 is a plane, protruding in a direction away from the light incident surface 110 or recessed in the direction of the light incident surface 110 to form a rear groove wall 126 of the groove 124, the two side planes 122 are formed on the two side walls 127 of the groove 124, and one of the corresponding sides of the two side planes 122 is adjacent to the microstructure arc surface 120, and the other corresponding sides of the two side planes 122 is adjacent to the microstructure surface 121.

[0067] In this embodiment, the number of the first microstructures 12 is plural, and the spacing distance between each first microstructure 12 close to the light incident surface 110 is different from the spacing distance between each first microstructure 12 away from the light incident surface 110. The aforementioned spacing distance can be arranged from sparse to dense in the direction away from the light incident surface 110, for example, the spacing distance is gradually reduced or stepped. For example, the first spacing distance is 3 millimeters (mm), the second spacing distance is 2.8 mm, and the third spacing distance is 2.5 mm.

[0068] In this embodiment, the two side planes 122 of the first microstructure 12 are separated by a slot length L1 at the first surface 111, the ratio of the radius of curvature of the cylindrical surface of the microstructure arc surface 120 to the slot length L1 (radius of curvature / slot length L1) is greater than or equal to 1 / 2, and the ratio of the radius of curvature of the cylindrical surface of the microstructure surface 121 to the slot length L1 is greater than or equal to 1 / 2.

[0069] To clearly illustrate the schematic path of the light beam reflected and refracted by the first microstructure 12 of the light guide plate 10 of the present invention, as shown in FIG. Figure 8 As shown, when the light beam is transmitted to the microstructure curved surface 120, part of the light beam generates total internal reflection at the microstructure curved surface 120 and is transmitted toward the light guide plate 10, and another part of the light beam is emitted from the microstructure curved surface 120 and is transmitted to the microstructure surface 121 after refraction. When another part of the light beam is transmitted to the microstructure surface 121, the light beam is retained in the light guide plate 10 due to the refraction of the microstructure surface 121. Therefore, the arrangement of the first microstructure 12 having the microstructure curved surface 120 and the microstructure surface 121 can guide the other part of the light beam back into the light guide plate 10, thereby reducing stray light. In summary, by designing the arc portion 123 formed by the microstructure arc surface 120 and the microstructure surface 121 (i.e., the microstructure arc surface 120 and the microstructure surface 121 are not connected by a plane), and by designing the first angle θ1 and the second angle θ2, the first surface width W1 of the first microstructure 12 can be reduced, thereby reducing the light beam from leaking out of the light guide plate 10 and avoiding the formation of stray light.

[0070] Fig. 9 It is a partial top view of the second embodiment of the light guide plate of the utility model. Fig.10 2 is a side perspective view of a second embodiment of the light guide plate of the present utility model. Fig. 9 and Fig.10As shown, the light guide plate 10' includes the above-mentioned first microstructure 12. Since the first microstructure 12 of this embodiment is the same as the above-mentioned, it is not repeated. In this embodiment, the light guide plate 10' further includes a second microstructure 13, which is disposed on the first surface 111 and is located between the light incident surface 110 and the first microstructure 12. The second microstructure 13 is separated from the first microstructure 12 by a setting distance d1, which means that the first microstructure 12 and the second microstructure 13 are not mixed and disposed on the first surface 111. Specifically, in the present embodiment, the second microstructure 13, for example, extends from the first surface 111 toward the bottom of the light guide plate 10' to form a plurality of triangular prism grooves, wherein the front wall 131 of each triangular prism groove is close to the light incident surface 110, and the rear wall 132 of each triangular prism groove is arranged relative to the front wall 131 of each triangular prism groove and away from the light incident surface 110, the front wall 131 connects the first surface 111 and the rear wall 132, and the rear wall 132 connects the first surface 111 and the front wall 131. The two opposite connecting walls of each triangular prism groove are adjacent to the front wall 131 and the rear wall 132 respectively, and the front wall 131 and the rear wall 132 intersect in the direction toward the bottom of the light guide plate 10', and the fifth angle θ5 between the front wall 131 and the first surface 111 is smaller than the sixth angle θ6 between the rear wall 132 and the first surface 111, for example, the angle of the fifth angle θ5 is greater than or equal to 30 degrees and less than or equal to 40 degrees, and the angle of the sixth angle θ6 is greater than or equal to 80 degrees and less than or equal to 90 degrees. The front wall 131 and the rear wall 132 of each triangular prism groove are arranged along the length of the light guide plate 10', that is, the second microstructure 13 extends from one side of the light guide plate 10' toward the opposite side and the aforementioned direction will not pass through the direction of the first microstructure 12, for example, the second microstructure 13 extends in a direction parallel to the light incident surface 110, and is arranged at intervals in a direction perpendicular to the light incident surface 110. In one embodiment, the fifth angle θ5 and the sixth angle θ6 are, for example, respectively equal to the first angle θ1 and the second angle θ2 .

[0071] In detail, in the present embodiment, the first surface 111 of the light guide plate 10' has a first area E1 and a second area E2, the second area E2 is disposed between the first area E1 and the light incident surface 110, the number of the first microstructures 12 is plural, the number of the second microstructures 13 is plural, the first microstructures 12 are disposed in the first area E1, the second microstructures 13 are disposed in the second area E2, and the ratio of the width of the second area E2 to the width of the first area E1 is less than 1 / 10. In detail, the width of the first area E1 and the width of the second area E2 refer to the direction along the normal of the light incident surface 110, and the length of the first area E1 and the length of the second area E2 refer to the direction parallel to the light incident surface 110, the length of the first area E1 and the length of the second area E2 are the same, for example, the length of the first surface 111 in the direction parallel to the light incident surface 110, the first area E1 and the second area E2 may be adjacent or the first area E1 and the second area E2 may be separated by a blank area S, the blank area S means that no additional structure is disposed, that is, a setting distance d1 is formed. In this embodiment, the width of the second area E2 may be 1 mm.

[0072] Fig.11 It is a partial top view of a third embodiment of the light guide plate of the present invention. Fig.12 FIG. 1 is an enlarged view of the C region of the third embodiment of the light guide plate of the utility model. Fig.11 and Fig.12 As shown, in the present embodiment, these second microstructures 13 are, for example, short triangular prism grooves, and are arranged along the first arrangement direction D1 and the second arrangement direction D2, and the first arrangement direction D1 is not parallel to the second arrangement direction D2, for example, these second microstructures 13 form a matrix arrangement. Specifically, the angle θ7 between the first arrangement direction D1 and the second arrangement direction D2 of these second microstructures 13 is greater than or equal to 30 degrees and less than or equal to 60 degrees. For example, the second microstructure 13 marked B1 is used as the reference position extending outward from the first arrangement direction D1, and the second arrangement direction D2 of the second microstructure 13 marked B2 is set relative to the first arrangement direction D1. The aforementioned Fig.12 The arrow direction is mainly drawn to match the descriptions B1 and B2, and the opposite direction may also be adopted. For example, for the mark B3, if the mark B1 is still used as the reference position, the arrow direction of the second arrangement direction D2 is toward the lower right. It is particularly noted that the arrangement direction of the second microstructures 13 is defined, for example, by the direction of the line connecting the geometric centers of each adjacent second microstructure 13, but the present invention is not limited thereto.

[0073] In this embodiment, the second microstructures 13 are arranged on the extension line of the first arrangement direction D1 and the extension line of the second arrangement direction D2, and the second microstructures 13 on the extension line of the first arrangement direction D1 are spaced apart by a length distance L2, and the second microstructures 13 on the extension line of the second arrangement direction D2 are spaced apart by a height H. In this embodiment, the length distance L2 may be the lateral width of the second microstructure 13, and the height H may be the longitudinal height of the second microstructure 13, that is, the second microstructure 13 in the first arrangement direction D1 and the second microstructure 13 in the second arrangement direction D2 are partially connected to each other, for example, the second microstructure 13 marked with B1, the upper left corner of the second microstructure 13 marked with B1 and the lower right corner of the second microstructure 13 marked with B2 share the same point. In another embodiment, the length distance L2 is equal to twice the height H.

[0074] Fig.13 : is a side view of the light source module of the utility model. Fig.13 As shown, the light source module 20 includes the above-mentioned light guide plates 1010', 10" and the light-emitting element 21. In this embodiment, the above-mentioned light guide plate 10 is mainly further combined with the light-emitting element 21, so the light guide plate 10 is not described in detail. The light-emitting element 21 is arranged on one side of the light incident surface 110 of the light guide plate 10, and the light-emitting element 21 emits a light beam to the light incident surface 110 and enters the light guide plate 10. Specifically, the light source module 20 can be applied to displays, liquid crystal displays or other displays using reflective panels. The light source module 20 is, for example, arranged on one side of the display surface of the display to enhance reading lighting and to irradiate downward onto the image due to reflection in the light guide plate 10, thereby enhancing the contrast of the image.

[0075] In summary, the light guide plate and the light source module used in the embodiment of the utility model have at least one of the following advantages. With the first microstructure of the light guide plate of the utility model, when the light beam passes through the microstructure curved surface, it is refracted toward the microstructure surface, and through the refraction of the microstructure surface, the light beam is retained in the light guide plate and does not emit out of the first surface. In this way, part of the light beam can be retained in the light guide plate to improve reading lighting, and part of the light beam will also be reflected in the light guide plate and irradiate downward on the image, thereby improving the contrast of the image.

[0076] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0077] However, what is described above is only the preferred embodiment of the utility model, and it cannot be used to limit the scope of implementation of the utility model. That is, all simple equivalent changes and modifications made according to the claims of the utility model and the content of the utility model are still within the scope of the utility model patent. In addition, any embodiment or claim of the utility model does not have to achieve all the purposes, advantages or features disclosed by the utility model. In addition, the abstract and title (utility model name) are only used to assist in patent document retrieval, and are not used to limit the scope of rights of the utility model. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A light guide plate, characterized in that: It includes a light guide plate body and a first microstructure: The light guide plate body has a light incident surface and a first surface, and the light incident surface is connected to the first surface; The first microstructure is formed on the first surface, and the first microstructure includes a microstructure arc surface, a microstructure surface, and two side planes: The microstructure arc surface is arranged close to the light incident surface, and the microstructure arc surface is a part of a cylindrical surface; The microstructure surface is disposed away from the light incident surface and is disposed on the opposite side of the microstructure curved surface; as well as The two side planes are respectively arranged on two opposite sides of the first microstructure, and each of the two side planes is connected to the microstructure arc surface, the microstructure surface and the first surface; The microstructure arc surface and the microstructure surface extend respectively in a direction away from the first surface, and the microstructure arc surface and the microstructure surface intersect and connect to form an arc portion.

2. The light guide plate according to claim 1, wherein: The number of the first microstructures is plural, and the spacing distance between the first microstructures close to the light incident surface is different from the spacing distance between the first microstructures far from the light incident surface.

3. The light guide plate according to claim 1, wherein: The first microstructure is formed by extending from the first surface toward the bottom of the light guide plate body to form a groove.

4. The light guide plate according to claim 3, wherein: The microstructure arc surface is formed on the front groove wall of the groove by protruding toward the light incident surface.

5. The light guide plate according to claim 4, wherein: The microstructure surface is formed on the rear groove wall of the groove by convexly extending in a direction away from the light incident surface or concavely extending in a direction toward the light incident surface.

6. The light guide plate according to claim 1, wherein: A first angle is formed between the first surface and the microstructure curved surface, and a second angle is formed between the first surface and the microstructure surface, and the first angle is smaller than the second angle.

7. The light guide plate according to claim 6, wherein: The first angle is greater than or equal to 30 degrees and less than or equal to 40 degrees, and the second angle is greater than or equal to 80 degrees and less than or equal to 90 degrees.

8. The light guide plate according to claim 6, wherein: The first surface and the two side planes respectively have a third angle and a fourth angle, and the third angle and the fourth angle are greater than or equal to 60 degrees and less than or equal to 85 degrees.

9. The light guide plate according to claim 4, wherein: The two side planes are spaced apart by a notch length at the first surface, and a ratio of a radius of curvature of the cylindrical surface of the microstructure arc surface to the notch length is greater than or equal to 1 / 2.

10. The light guide plate according to claim 1, wherein: The light guide plate further comprises: The second microstructure is disposed on the first surface and is located between the light incident surface and the first microstructure and is spaced apart from the first microstructure by a set distance. The second microstructure extends from the first surface toward the bottom of the light guide plate to form a triangular prism groove.

11. The light guide plate according to claim 10, wherein: The first surface of the light guide plate has a first area and a second area, the second area is arranged between the first area and the light incident surface, the number of the first microstructures is plural, the number of the second microstructures is plural, these first microstructures are arranged in the first area, the second microstructures are arranged in the second area, and the ratio of the width of the second area to the width of the first area is less than 1 / 10.

12. The light guide plate according to claim 10, wherein: The number of the second microstructures is plural, and the second microstructures extend in a direction parallel to the light incident surface and are arranged at intervals in a direction perpendicular to the light incident surface.

13. The light guide plate according to claim 10, wherein: The number of the second microstructures is plural, and the second microstructures are arranged along a first arrangement direction and a second arrangement direction, and the first arrangement direction is not parallel to the second arrangement direction.

14. The light guide plate according to claim 13, wherein: An included angle between the first arrangement direction and the second arrangement direction is greater than or equal to 30 degrees and less than or equal to 60 degrees.

15. The light guide plate according to claim 10, wherein: The first surface and the front wall of the second microstructure have a fifth angle, the first surface and the back wall of the second microstructure have a sixth angle, the fifth angle is greater than or equal to 30 degrees and less than or equal to 40 degrees, and the sixth angle is greater than or equal to 80 degrees and less than or equal to 90 degrees.

16. A light source module, characterized in that: include: A light guide plate as claimed in claim 1; as well as The light emitting element is arranged on one side of the light incident surface of the light guide plate body.

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