Light guide plate having partitioned microstructures and light source module

Abstract

A light guide plate with partitioned microstructures has an incident light surface, an exit light surface, and a bottom surface. The bottom surface includes a first region, a second region, and a third region located between the first and second regions. The first region includes multiple first microstructures with first reflective surfaces. The area of ​​each first reflective surface gradually increases from near the incident light surface towards the direction away from the incident light surface. The second region includes multiple second microstructures with second reflective surfaces. The area of ​​each second reflective surface gradually increases from near the incident light surface towards the direction away from the incident light surface. The third region includes multiple third microstructures with third reflective surfaces. The area of ​​each third reflective surface is the same. The present invention also provides a light source module having this light guide plate.

Description

[Technical Field]

[0001] The present invention relates to a light source module, and more particularly to a light guide plate having a partitioned microstructure and a light source module using the light guide plate. [Previous Technology]

[0002] A typical liquid crystal display device includes a liquid crystal display panel and a backlight module. Since the liquid crystal display panel itself does not emit light, it needs to rely on the backlight module to provide an illumination source to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide an illumination source with high brightness and high uniformity.

[0003] Backlight modules can be divided into edge-lit backlight modules and direct-lit backlight modules. In current edge-lit backlight modules, sometimes groove structures (such as V-grooves, R-grooves, etc.) or other types of microstructures are designed in the light guide plate to adjust the light to achieve specific effects (such as controlling the light emission direction, scattering light, etc.). However, regardless of the method, edge-lit backlight modules have disadvantages. Therefore, a microstructure design method that does not affect the display image while maintaining product quality is needed.

[0004] This "Prior Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Prior Art" may include some prior art that does not constitute conventional art known to those skilled in the art. In addition, the content disclosed in the "Prior Art" does not represent the problem to be solved by such content or one or more embodiments of this invention, nor does it represent that it was known or recognized by those skilled in the art prior to this application. [Summary of the Invention]

[0005] The present invention provides a light guide plate with a partitioned microstructure, which can improve brightness uniformity.

[0006] The present invention provides a light source module that can improve brightness uniformity and product quality.

[0007] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0008] To achieve one, some, or all of the above objectives, or other objectives, an embodiment of the present invention provides a light guide plate with partitioned microstructures, having an incident light surface, an emitting light surface, and a bottom surface facing away from the emitting light surface. The emitting light surface is parallel to the bottom surface, and the incident light surface is connected to the emitting light surface and the bottom surface. The bottom surface includes a first region, a second region, and a third region. The first region is disposed on the side of the bottom surface adjacent to the incident light surface. The first region includes a plurality of first microstructures. Each first microstructure has a first reflective surface facing the incident light surface. The area of ​​the first reflective surface of each first microstructure gradually increases from near the incident light surface toward away from the incident light surface. The first reflective surface is directly connected to the bottom surface, and the distance between the connection points of any two adjacent first reflective surfaces and the bottom surface is the same, with a first bottom angle between the first reflective surface and the bottom surface. The second region is disposed on the side of the bottom surface away from the incident light surface. The second region includes a plurality of second microstructures. Each second microstructure has a second reflective surface facing the incident light surface. The area of ​​the second reflective surface of each second microstructure gradually increases from near the incident light surface toward away from the incident light surface. The second reflective surface is directly connected to the bottom surface. The distance between the connection points of any two adjacent second reflective surfaces and the bottom surface is the same, and the second reflective surface and the bottom surface form a second bottom angle. A third region is disposed on the bottom surface, located between the first and second regions. The third region includes multiple third microstructures. Each third microstructure has a third reflective surface facing the incident light surface. The area of ​​the third reflective surface of each third microstructure is the same. The third reflective surface is directly connected to the bottom surface, and the distance between the connection points of any two adjacent third reflective surfaces and the bottom surface gradually decreases from the direction closer to the incident light surface towards the direction farther from the incident light surface. The third reflective surface and the bottom surface form a third bottom angle.

[0009] In one embodiment of the present invention, the height of the plurality of first microstructures in the direction perpendicular to the light-emitting surface gradually increases from the direction near the light-incident surface to the direction away from the light-incident surface, the height of the plurality of second microstructures in the direction perpendicular to the light-emitting surface gradually increases from the direction near the light-incident surface to the direction away from the light-incident surface, and the height of the plurality of third microstructures in the direction perpendicular to the light-emitting surface is the same.

[0010] In one embodiment of the present invention, the maximum height of the plurality of first microstructures is the same as the height of the plurality of third microstructures, and the height of the plurality of third microstructures is also the same as the minimum height of the plurality of second microstructures.

[0011] In one embodiment of the present invention, the heights of the plurality of first microstructures, the plurality of second microstructures and the plurality of third microstructures are in the range of greater than 0 and less than or equal to 0.2 mm.

[0012] In one embodiment of the present invention, the plurality of first microstructures, the plurality of second microstructures and the plurality of third microstructures are strip structures, and extend along an extension direction parallel to the light incident surface and are arranged along an arrangement direction perpendicular to the light incident surface.

[0013] In one embodiment of the present invention, each of the first microstructures, each of the second microstructures and each of the third microstructures described above includes a plurality of strip-shaped substructures that are spaced apart and arranged along the extension direction.

[0014] In one embodiment of the present invention, the plurality of first microstructures, the plurality of second microstructures and the plurality of third microstructures are dot structures, and the first reflective surface, the second reflective surface and the third reflective surface are curved surfaces.

[0015] In one embodiment of the present invention, the angles of the first base angle, the second base angle and the third base angle are the same.

[0016] In one embodiment of the present invention, the distance between any two adjacent first base corners, the distance between any two adjacent second base corners, and the distance between any two adjacent third base corners are 0.001 mm to 2 mm.

[0017] To achieve one or more of the above objectives or other objectives, an embodiment of the present invention provides a light source module including at least one light-emitting element and the light guide plate described above. The at least one light-emitting element is disposed next to the light-incident surface and is adapted to emit light to the light-incident surface.

[0018] In the light guide plate with partitioned microstructures of this embodiment of the invention, its bottom surface includes a first region, a second region, and a third region. The third region is located between the first region and the second region. The first region includes a plurality of first microstructures, the second region includes a plurality of second microstructures, and the third region includes a plurality of third microstructures. The area of ​​the first reflective surface of each first microstructure gradually increases from near the light-incident surface to away from it. The first reflective surface and the bottom surface have a first bottom angle, and the distance between the connection points of any two adjacent first reflective surfaces and the bottom surface is the same. The area of ​​the second reflective surface of each second microstructure also gradually increases from near the light-incident surface to away from it. The second reflective surface and the bottom surface have a second bottom angle, and the distance between the connection points of any two adjacent second reflective surfaces and the bottom surface is also the same. That is, the plurality of first microstructures and the plurality of second microstructures are arranged on the bottom surface of the light guide plate in an adjustable manner. On the other hand, the area of ​​the third reflective surface of each third microstructure is the same, and there is a third bottom angle between the third reflective surface and the bottom surface. The distance between the connection points of any two adjacent third reflective surfaces and the bottom surface gradually decreases from the direction closer to the light-incident surface to the direction farther away from the light-incident surface. That is, multiple third microstructures are arranged on the bottom surface of the light guide plate in a frequency-adjusting manner, and are located between multiple first microstructures and multiple second microstructures. Overall, the microstructures of the light guide plate in this embodiment of the invention are arranged on the bottom surface in a mixed amplitude and frequency configuration, which can improve the problems of difficult mold processing or molding, and also improve the problems of dark and bright areas on the display screen, thus improving brightness uniformity. Since the light source module of this embodiment of the invention uses the above-mentioned light guide plate, it can also improve brightness uniformity and maintain product quality.

[0019] In order to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings.

Implementation Method

[0020] The foregoing descriptions and other technical contents, features, and effects of this invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0021] Figure 1 is a perspective view of a light source module according to an embodiment of the present invention. Figure 2 is a cross-sectional view of Figure 1. Referring to Figures 1 and 2, the light source module 10 of this embodiment includes a light guide plate 100 with partitioned microstructures and at least one light-emitting element 200. The light guide plate 100 has a light-incident surface 110, a light-emitting surface 120, a bottom surface 130, and a side surface 140. The light-incident surface 110 is connected to the light-emitting surface 120 and the bottom surface 130, and the side surface 140 is also connected to the light-emitting surface 120 and the bottom surface 130. The light-emitting surface 120 and the bottom surface 130 are arranged opposite to each other and parallel to each other, and the light-incident surface 110 and the side surface 140 are arranged opposite to each other and parallel to each other. At least one light-emitting element 200 is disposed next to the light-incident surface 110 and is adapted to emit light L that enters the light guide plate 100 through the light-incident surface 110. The bottom surface 130 has multiple microstructures, such as strip-shaped microstructures, but is not limited thereto. The bottom surface 130 includes a first region R1, a second region R2, and a third region R3 that are adjacent to each other. The first region R1 includes a plurality of first microstructures 131, the second region R2 includes a plurality of second microstructures 132, and the third region R3 includes a plurality of third microstructures 133. In this embodiment, the bottom surface 130 is composed of the first region R1, the second region R2, and the third region R3. In other embodiments, the bottom surface 130 may further include a blank area (not shown in the figure), for example, disposed between the first region R1 and the light-incident surface 110, and adjacent to the light-incident surface 110. The bottom surface 130 within the blank area is a flat surface, that is, the bottom surface 130 within the blank area does not have any microstructures. Under the above design configuration, it is possible to avoid the light L being directly reflected by the first microstructures 131 in the first region R1 after entering the light guide plate 100 through the light-incident surface 110, thus reducing the firefly (hotspot) phenomenon at the light-incident end of the light guide plate 100. In this embodiment, the light guide plate 100 further has a first side surface 150 and a second side surface 160, wherein the first side surface 150 and the second side surface 160 are disposed between the light emitting surface 120 and the bottom surface 130, and between the light incident surface 110 and the side surface 140. These strip-shaped microstructures extend from the first side surface 150 along an extension direction E parallel to the light incident surface 110 to the second side surface 160, that is, these strip-shaped microstructures connect the first side surface 150 and the second side surface 160, and are arranged along an arrangement direction A perpendicular to the light incident surface 110. In another embodiment, the two ends of these strip-shaped microstructures are respectively spaced from the first side surface 150 and the second side surface 160, wherein the space is used as a blank area to prevent the two ends of these strip-shaped microstructures from being connected to the first side surface 150 and the second side surface 160 respectively, thus avoiding the formation of side bright lines when displayed. Furthermore, these strip-shaped microstructures can be, for example, concave structures formed by the bottom surface 130 protruding into the light guide plate 100. In another embodiment, these strip-shaped microstructures can also be convex structures formed by the bottom surface 130 protruding outward from the light guide plate 100.Figure 1 shows a diagram with 9 microstructures, and Figure 2 shows a diagram with 3 first microstructures 131, 3 second microstructures 132 and 3 third microstructures 133. However, the present invention does not particularly limit the number of first microstructures 131, second microstructures 132 and third microstructures 133.

[0022] In this embodiment, the first region R1 is disposed on the side of the bottom surface 130 adjacent to the light-incident surface 110; the second region R2 is disposed on the side of the bottom surface 130 away from the light-incident surface 110, that is, the second region R2 is disposed on the side of the bottom surface 130 adjacent to the side surface 140; the third region R3 is disposed on the bottom surface 130 and located between the first region R1 and the second region R2. The length ratio of the first region R1, the second region R2 and the third region R3 in the direction perpendicular to the light-incident surface 110 is 1:1:1, but it is not limited thereto. In other embodiments, the length ratio of the first region R1, the second region R2 and the third region R3 can be adjusted according to needs. The higher the proportion of the region, the more microstructures are disposed in the region. For example, if the length ratio of the first region R1, the second region R2 and the third region R3 is 2:1:1, then the number of the first microstructure 131 will be greater than the number of the second microstructure 132 and the third microstructure 133. In other embodiments, the number and proportion of microstructures configured within a region are independent of their relative proportions and can be adjusted according to the spacing between microstructures and requirements. The structural features of the first microstructure 131, the second microstructure 132, and the third microstructure 133 will be described in detail below.

[0023] In the first region R1, each first microstructure 131 has a first reflective surface 1311 facing the light-incident surface 110. The area of ​​the first reflective surface 1311 of each first microstructure 131 gradually increases from the direction near the light-incident surface 110 toward the direction away from the light-incident surface 110. In other embodiments, its area may remain constant, or it may gradually decrease and then gradually increase from the direction near the light-incident surface 110 toward the direction away from the light-incident surface 110. As shown in the cross-sectional view of FIG2, the longer the length of the first reflective surface 1311 shown in the figure, the larger the area of ​​the first reflective surface 1311. Furthermore, the height H1 of the plurality of first microstructures 131 in the direction perpendicular to the bottom surface 130 also gradually increases from the direction near the light-incident surface 110 toward the direction away from the light-incident surface 110. It should be noted that, for ease of description in the specification, the height of the three first microstructures 131 is referred to as "height H1", but in reality, the heights of the three are not the same. In the first region R1 of Figure 2, the height of the first microstructure 131 in the middle is greater than the height of the first microstructure 131 on the left, and the height of the first microstructure 131 on the right is greater than the height of the first microstructure 131 in the middle. Here, "height" refers to the distance between the vertex of the first microstructure 131 and the bottom surface 130. In this embodiment, it can be considered the depth of the concave structure. In other embodiments, if the microstructure is a convex structure, it can be considered the height protruding from the bottom surface 130. In the first region R1 of Figure 2, the multiple first microstructures 131 are separated from each other and not connected. That is, any two adjacent first microstructures 131 are spaced apart by a first spacing d1. The length of all first spacings d1 in the first region R1 gradually decreases from the light-receiving surface 110 away from it. It should be noted that for ease of description, the distance between any two adjacent first microstructures 131 is referred to as "first spacing d1" in the specification, but in reality, the distance between any two adjacent first microstructures 131 in the first region R1 is not the same. In the first region R1 of Figure 2, the first distance d1 between the first microstructure 131 on the left and the first microstructure 131 in the middle is greater than the first distance d1 between the first microstructure 131 in the middle and the first microstructure 131 on the right. On the other hand, the first reflective surface 1311 is directly connected to the bottom surface 130, and the distance D1 between the connection points of any two adjacent first reflective surfaces 1311 and the bottom surface 130 is the same. The first reflective surface 1311 and the bottom surface 130 have a first bottom angle θ1. Furthermore, the angle of each first bottom angle θ1 in the first region R1 is the same. Since the area of ​​the first reflective surface 1311 and the height H1 of the first microstructure 131 gradually increase from near the light-incident surface 110 towards away from the light-incident surface 110, but the angle of the first bottom angle θ1 remains unchanged, the structure of the multiple first microstructures 131 is proportionally enlarged from near the light-incident surface 110 towards away from the light-incident surface 110.Specifically, the height H1 of the first microstructure is, for example, greater than 0 and less than or equal to 0.2 mm, and the distance D1 between any two adjacent first base angles θ1 is, for example, 0.001 mm to 2 mm, but is not limited thereto.

[0024] Similarly, in the second region R2, each second microstructure 132 has a second reflective surface 1321 facing the light-incident surface 110. The area of ​​the second reflective surface 1321 of each second microstructure 132 gradually increases from the direction near the light-incident surface 110 toward the direction away from the light-incident surface 110. In other embodiments, its area may remain constant, or it may gradually increase and then decrease from the direction near the light-incident surface 110 toward the direction away from the light-incident surface 110. Furthermore, the height H2 of the plurality of second microstructures 132 in the direction perpendicular to the bottom surface 130 also gradually increases from the direction near the light-incident surface 110 toward the direction away from the light-incident surface 110. It should be noted that, for ease of description, the height of all three second microstructures 132 is referred to as "height H2" in the specification, but in reality, the three heights are not the same. That is, in the second region R2 of FIG2, the height of the middle second microstructure 132 is greater than the height of the left second microstructure 132, and the height of the right second microstructure 132 is greater than the height of the middle second microstructure 132. In the second region R2 of Figure 2, multiple second microstructures 132 are separated from each other and not connected. That is, any two adjacent second microstructures 132 are spaced apart by a second spacing d2. The length of all second spacings d2 in the second region R2 gradually decreases from the light-receiving surface 110 away from the light-receiving surface 110. It should be noted that, for ease of description, the distance between any two adjacent second microstructures 132 is referred to as "second spacing d2" in the specification, but in reality, the distance between any two adjacent second microstructures 132 in the second region R2 is not the same. That is, in the second region R2 of Figure 2, the second spacing d2 from the left second microstructure 132 to the middle second microstructure 132 is greater than the second spacing d2 from the middle second microstructure 132 to the right second microstructure 132. On the other hand, the second reflecting surface 1321 is directly connected to the bottom surface 130, and the distance D2 between the connection points of any two adjacent second reflecting surfaces 1321 and the bottom surface 130 is the same. The second reflecting surface 1321 and the bottom surface 130 have a second bottom angle θ2. Furthermore, the angle of each second base angle θ2 in the second region R2 is the same. Since the area of ​​the second reflective surface 1321 of the second microstructure 132 and the height H2 of the second microstructure 132 gradually increase from the direction closer to the light-receiving surface 110 to the direction farther away from the light-receiving surface 110, but the angle of the second base angle θ2 remains unchanged, the structure of multiple second microstructures 132 is proportionally enlarged from the direction closer to the light-receiving surface 110 to the direction farther away from the light-receiving surface 110. Specifically, the height H2 of the second microstructure is, for example, greater than 0 and less than or equal to 0.2 mm, and the distance D2 between any two adjacent second base angles θ2 is, for example, 0.001 mm to 2 mm, but is not limited to this.

[0025] The larger the area of ​​the first reflective surface 1311 and the second reflective surface 1321, the higher the probability that light L will be transmitted to the first reflective surface 1311 and the second reflective surface 1321. Therefore, the further away the light L is from the light incident surface 110, the easier it is to be refracted out of the light guide plate 100. With this design, the light output brightness of the side of the light guide plate 100 away from the light-emitting element 200 can be improved.

[0026] In the third region R3, each third microstructure 133 has a third reflective surface 1331 facing the light-incident surface 110. The area of ​​the third reflective surface 1331 of each third microstructure 133 is the same. Furthermore, the height H3 of the plurality of third microstructures 133 in the direction perpendicular to the bottom surface 130 is also the same. In the third region R3 of FIG2, the plurality of third microstructures 133 are separated from each other and are not connected, that is, any two adjacent third microstructures 133 are separated by a third spacing d3, and the length of all third spacings d3 in the third region R3 gradually decreases from the light-incident surface 110 away from the light-incident surface 110. It should be noted that, for the convenience of description, the distance between any two adjacent third microstructures 133 is referred to as "third spacing d3" in the specification, but in fact, the distance between any two adjacent third microstructures 133 in the third region R3 is not the same. In the third region R3 of Figure 2, the third distance d3 between the left third microstructure 133 and the middle third microstructure 133 is greater than the third distance d3 between the middle third microstructure 133 and the right third microstructure 133. On the other hand, the third reflecting surface 1331 is directly connected to the bottom surface 130. The distance between the connection points of any two adjacent third reflecting surfaces 1331 and the bottom surface 130 gradually decreases from the direction closer to the light-incident surface 110 towards the direction farther from the light-incident surface 110. There is a third base angle θ3 between the third reflecting surface 1331 and the bottom surface 130, and the angle of each third base angle θ3 in the third region R3 is the same. It should be noted that, for ease of description, the distance between the connection points of any two adjacent third reflecting surfaces 1331 and the bottom surface 130 is referred to as "distance D3" in the specification, but in reality, the distance between the connection points of any two adjacent third reflecting surfaces 1331 and the bottom surface 130 in the third region R3 is not the same. In the third region R3 of Figure 2, the distance from the connection point of the left third reflective surface 1331 to the bottom surface 130 to the connection point of the middle third reflective surface 1331 to the bottom surface 130 is greater than the distance from the connection point of the middle third reflective surface 1331 to the bottom surface 130 to the connection point of the right third reflective surface 1331 to the bottom surface 130. Furthermore, the angle of each third bottom angle θ3 in the third region R3 is the same, meaning that the size of each third microstructure 133 is the same (since the height H3 of each third microstructure 133 is also the same). Specifically, the height H3 of the third microstructure 133 is, for example, greater than 0 and less than or equal to 0.2 mm, and the distance D3 between any two adjacent third bottom angles θ3 is, for example, 0.001 mm to 2 mm, but is not limited to this.

[0027] In this embodiment, the angles of the first base angle θ1, the second base angle θ2, and the third base angle θ3 are, for example, the same. Furthermore, heights H1 and H2 gradually increase from near the light-incident surface 110 towards the direction away from it, and the first region R1 is adjacent to the light-incident surface 110, while the second region R2 is relatively far from it. Therefore, on average, height H1 is less than height H2. Taking the embodiment of FIG2 as an example, the maximum height of the plurality of first microstructures 131 in height H1 is the same as the minimum height of the plurality of second microstructures 132 in height H2, that is, the height of the first microstructure 131 on the right side of the first region R1 is the same as the height of the second microstructure 132 on the left side of the second region R2. In another embodiment, the maximum height of the plurality of first microstructures 131 in height H1 may also be less than the minimum height of the plurality of second microstructures 132 in height H2. Since the third region R3 is located between the first region R1 and the second region R2, and the height H3 of the multiple third microstructures 133 is also the same, specifically, the maximum height of the multiple first microstructures 131 is the same as the height H3 of the multiple third microstructures 133, and the height H3 of the multiple third microstructures 133 is also the same as the minimum height of the multiple second microstructures 132.

[0028] In this embodiment, the length of the first spacing d1 between any two adjacent first microstructures 131 is, for example, greater than the length of the third spacing d3 between any two adjacent third microstructures 133, and the length of the third spacing d3 between any two adjacent third microstructures 133 is, for example, greater than the length of the second spacing d2 between any two adjacent second microstructures 132.

[0029] In this embodiment, the distance D1 between any two adjacent first reflective surfaces 1311 and the bottom surface 130 is, for example, the same as the distance D2 between any two adjacent second reflective surfaces 1321 and the bottom surface 130. In another embodiment, the distance D1 between any two adjacent first reflective surfaces 1311 and the bottom surface 130 is, for example, greater than the distance D2 between any two adjacent second reflective surfaces 1321 and the bottom surface 130. The distance D3 between any two adjacent third reflective surfaces 1331 and the bottom surface 130 gradually decreases from the direction closer to the light-receiving surface 110 to the direction farther away from the light-receiving surface 110, while the distance D3 is less than or equal to the distance D1, and the distance D3 is greater than or equal to the distance D2.

[0030] Overall, the height of the microstructure on the bottom surface 130 of the light guide plate 100 and the area of ​​its reflective surface tend to gradually increase from the light-incident surface 110 toward the direction away from the light-incident surface 110.

[0031] At least one light-emitting element 200 is, for example, a light-emitting diode (LED), but is not limited thereto. The light-emitting element 200 can also be other types of light source components, such as lamps, and the present invention does not limit the type of light source. This embodiment uses three light-emitting elements 200 as an example, but the present invention does not particularly limit the number of multiple light-emitting elements 200.

[0032] In the light guide plate 100 with partitioned microstructures in this embodiment, the area of ​​the first reflective surface 1311 of each first microstructure 131 gradually increases from the light-incident surface 110 toward the light-incident surface 110, and the distance D1 between any two adjacent first reflective surfaces 1311 and the bottom surface 130 is the same; the area of ​​the second reflective surface 1321 of each second microstructure 132 also gradually increases from the light-incident surface 110 toward the light-incident surface 110, and the distance D2 between any two adjacent second reflective surfaces 1321 and the bottom surface 130 is also the same, that is, the plurality of first microstructures 131 and the plurality of second microstructures 132 are arranged on the bottom surface 130 of the light guide plate 100 in an adjustable manner. On the other hand, the area of ​​the third reflective surface 1331 of each third microstructure 133 is the same, and the distance D3 between the connection points of any two adjacent third reflective surfaces 1331 and the bottom surface 130 gradually decreases from the direction closer to the light-incident surface 110 to the direction farther away from the light-incident surface 110. That is, the multiple third microstructures 133 are arranged on the bottom surface 130 of the light guide plate 100 in a frequency-adjusting manner, and are located between the multiple first microstructures 131 and the multiple second microstructures 132. Under the above design configuration, whether it is the first region R1, the second region R2, or the third region R3, the farther away from the light-incident surface 110, the easier it is for light L to be emitted, thus achieving the effect of adjusting the uniformity of light emission. Overall, the microstructures of the light guide plate 100 in this embodiment are configured on the bottom surface 130 in a mixed amplitude and frequency configuration. Since the size of the multiple third microstructures 133 in the third region R3 remains the same, only the distance D3 between any two adjacent third bottom corners θ3 changes. Therefore, the third region R3 can serve as a buffer area for the size of the configured microstructures. Compared to the problem of edge microstructures being too small or too large when using a light guide plate that only uses microstructures to adjust amplitude, the size difference of the microstructures in this embodiment is not too large, which can improve the problem of difficult mold processing or molding. Compared to light guide plates that only use microstructures to adjust frequency, the light guide plate 100 in this embodiment can also improve the problem of dark and bright areas on the display screen, thus improving brightness uniformity. Since the light source module 10 in this embodiment uses the above-mentioned light guide plate 100, it can also improve brightness uniformity and maintain product quality.

[0033] Under the design concept of the above-described mixed amplitude and frequency configuration of microstructures, the light guide plate 100 with partitioned microstructures in this embodiment of the invention may also have other variations. For example, the bottom surface 130 of the light guide plate 100 may further include a fourth region and a fifth region (not shown). The second region R2 is located between the first region R1 and the fifth region, and the fourth region is located between the second region R2 and the fifth region. The design of the microstructure of the fourth region is the same as the design of the plurality of third microstructures 133 of the third region R3, while the design of the microstructure of the fifth region is the same as the design of the plurality of first microstructures 131 of the first region R1 and the plurality of second microstructures 132 of the second region R2. That is, the microstructure of the bottom surface 130 as a whole presents an amplitude modulation, frequency modulation, amplitude modulation, frequency modulation, amplitude modulation in sequence from the direction near the light incident surface 110 to the direction away from the light incident surface 110, which can also achieve a similar effect.

[0034] In this embodiment, each first microstructure 131 further includes, for example, a first surface 1312. The first surface 1312 is directly connected at both ends to the first reflective surface 1311 and the bottom surface 130, and is located away from the light-incident surface 110 and faces the side surface 140. The first surface 1312 is primarily not used for reflecting light L. Each second microstructure 132 further includes, for example, a second surface 1322. The second surface 1322 is directly connected at both ends to the second reflective surface 1321 and the bottom surface 130, and is located away from the light-incident surface 100 and faces the side surface 140. The second surface 1322 is primarily not used for reflecting light L. Each third microstructure 133 further includes, for example, a third surface 1332. The third surface 1332 is directly connected at both ends to the third reflective surface 1331 and the bottom surface 130, and is located away from the light-incident surface 110 and faces the side surface 140. The third surface 1332 is primarily not used for reflecting light L. Each of the first surface 1312, each of the second surface 1322 and each of the third surface 1332 has the same angle with the bottom surface 130.

[0035] In another embodiment, the first microstructure 131, the second microstructure 132, and the third microstructure 133 may also be a dotted structure, and the first reflective surface 1311, the second reflective surface 1321, and the third reflective surface 1331 may be curved surfaces. Alternatively, in this embodiment, the first microstructure 131, the second microstructure 132, and the third microstructure 133 may be a strip structure, but the first reflective surface 1311, the second reflective surface 1321, and the third reflective surface 1331 may be designed as curved surfaces.

[0036] Figure 3 is a perspective view of a light source module according to another embodiment of the present invention. For ease of explanation, the bottom surface of the light guide plate is shown facing upwards. Referring to Figure 3, the light source module 10a of this embodiment is similar in structure and advantages to the light source module 10 described above. The difference lies only in that, in the light source module 10a of this embodiment, the bottom surface 130a of the light guide plate 100a further includes a plurality of protruding strip-shaped structures 134 protruding from the bottom surface 130a outwards from the plate body of the light guide plate 100a. These protruding strip-shaped structures 134 extend, for example, along the arrangement direction A and are arranged along the extension direction E, and each strip-shaped microstructure is cut into a plurality of spaced strip-shaped substructures. For example, each first microstructure 131 is cut into a plurality of spaced first strip-shaped substructures 131a, each second microstructure 132 is cut into a plurality of spaced second strip-shaped substructures 132a, and each third microstructure 133 is cut into a plurality of spaced third strip-shaped substructures 133a. Therefore, multiple first strip-shaped substructures 131a are arranged along the extension direction E of the first microstructure 131, multiple second strip-shaped substructures 132a are arranged along the extension direction E of the second microstructure 132, and multiple third strip-shaped substructures 133a are arranged along the extension direction E of the third microstructure 133, and are also a variation of the microstructure. The above configuration is formed by cutting along the arrangement direction A on the light guide plate mold core corresponding to the bottom surface of the light guide plate with an arc-shaped or polygonal cutter. Since the cut marks on the light guide plate mold core are strip-shaped grooves, after being transferred out during the manufacturing process of the light guide plate, they become the above-mentioned raised strip-shaped structures 134.

[0037] In this embodiment, since each first microstructure 131, each second microstructure 132, and each third microstructure 133 is cut into multiple segments by multiple protruding strip structures 134, the number and proportion of microstructures in each row parallel to the protruding strip structures 134 (taking Figure 3 as an example, including 3 first strip substructures 131a, 3 second strip substructures 132a, and 3 third strip substructures 133a) can be individually adjusted. For example, the first row has 3 first strip substructures 131a, 3 second strip substructures 132a, and 3 third strip substructures 133a, while the second row has 4 first strip substructures 131a, 1 second strip substructure 132a, and 4 third strip substructures 133a, etc., which allows for more detailed segmentation and adjustment of the light-emitting area effect without the need for large-area modifications.

[0038] In addition to the above-mentioned manufacturing method, the first strip substructure 131a, the second strip substructure 132a and the third strip substructure 133a can also be formed directly without the need for a cutting process. In this case, the two adjacent rows of microstructures are flat and do not have protruding strip structures 134, which can achieve the above-mentioned effect.

[0039] In summary, in the light guide plate with partitioned microstructures of the present invention, the area of ​​the first reflective surface of each first microstructure gradually increases from the direction near the light-incident surface to the direction away from the light-incident surface, and the distance between any two adjacent first reflective surfaces and the bottom surface is the same; the area of ​​the second reflective surface of each second microstructure also gradually increases from the direction near the light-incident surface to the direction away from the light-incident surface, and the distance between any two adjacent second reflective surfaces and the bottom surface is also the same, that is, multiple first microstructures and multiple second microstructures are arranged on the bottom surface of the light guide plate in an adjustable manner. On the other hand, the area of ​​the third reflective surface of each third microstructure is the same, and the distance between any two adjacent third reflective surfaces and the bottom surface gradually decreases from the direction near the light-incident surface to the direction away from the light-incident surface, that is, multiple third microstructures are arranged on the bottom surface of the light guide plate in an adjustable manner, and are located between multiple first microstructures and multiple second microstructures. Under the above design configuration, whether it is the first region, the second region, or the third region, the farther away from the light-incident surface, the easier it is for light to be emitted, thus achieving the effect of adjusting the uniformity of light emission. Overall, the microstructures of the light guide plate in this embodiment are configured on the bottom surface using a mixed amplitude and frequency configuration. Since the dimensions of the multiple third microstructures in the third region remain constant, only the distance between any two adjacent third bottom corners changes. Therefore, the third region can serve as a buffer area for the size of the configured microstructures. Compared to light guide plates that use only microstructures to adjust amplitude, which may result in edge microstructures being too small or too large, the size difference of the microstructures in this embodiment is not significant, thus improving the difficulty in mold processing or molding. Compared to light guide plates that use only microstructures to adjust frequency, the light guide plate in this embodiment can also improve the problem of dark and bright areas on the display screen, thus improving brightness uniformity. Because the light source module in this embodiment uses the aforementioned light guide plate, it can also improve brightness uniformity and maintain product quality.

[0040] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the invention are still within the scope of the patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and headings are merely for assisting in patent document searches and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," etc., used in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements. [Simplified Explanation of the Diagram]

[0041] Figure 1 is a perspective view of a light source module according to an embodiment of the present invention. Figure 2 is a cross-sectional view of Figure 1. Figure 3 is a perspective view of a light source module according to another embodiment of the present invention.

Claims

1. A light guide plate with a partitioned microstructure, having a light-incident surface, a light-exit surface, and a bottom surface facing away from the light-exit surface, the light-incident surface being connected to the light-exit surface and the bottom surface, the bottom surface comprising: A first region is disposed on the side of the bottom surface adjacent to the light-incident surface. The first region includes a plurality of first microstructures, each of which has a first reflective surface facing the light-incident surface. The area of ​​the first reflective surface of each of the first microstructures gradually increases from the direction near the light-incident surface to the direction away from the light-incident surface. The first reflective surface is directly connected to the bottom surface, and the distance between the connection points of any two adjacent first reflective surfaces and the bottom surface is the same. The first reflective surface and the bottom surface form a first bottom angle, and the angle of each first bottom angle in the first region is the same. A second region is disposed on the side of the bottom surface away from the light-incident surface. The second region includes a plurality of second microstructures, each of which has a second reflective surface facing the light-incident surface. The area of ​​the second reflective surface of each of the second microstructures gradually increases from the direction near the light-incident surface to the direction away from the light-incident surface. The direction gradually increases, the second reflective surface is directly connected to the bottom surface, the distance between any two adjacent second reflective surfaces and the bottom surface is the same, the second reflective surface and the bottom surface form a second bottom angle, and the angle of each second bottom angle in the second region is the same; and a third region is disposed on the bottom surface and located between the first region and the second region, the third region includes a plurality of third microstructures, each of the third microstructures has a third reflective surface facing the light-incident surface, the area of ​​the third reflective surface of each of the third microstructures is the same, the third reflective surface is directly connected to the bottom surface, the distance between any two adjacent third reflective surfaces and the bottom surface gradually decreases from the direction closer to the light-incident surface to the direction farther away from the light-incident surface, the third reflective surface and the bottom surface form a third bottom angle, and the angle of each third bottom angle in the third region is the same.

2. The light guide plate as claimed in claim 1, wherein the height of the first microstructures in the direction perpendicular to the bottom surface gradually increases from the light-incident surface toward the light-incident surface, the height of the second microstructures in the direction perpendicular to the bottom surface gradually increases from the light-incident surface toward the light-incident surface, and the height of the third microstructures in the direction perpendicular to the bottom surface is the same.

3. A light guide plate with partitioned microstructures as described in claim 2, wherein the maximum height of the first microstructures is the same as the height of the third microstructures, and the height of the third microstructures is the same as the minimum height of the second microstructures.

4. A light guide plate with partitioned microstructures as described in claim 2, wherein the heights of the first microstructures, the second microstructures, and the third microstructures are in the range of greater than 0 and less than or equal to 0.2 mm.

5. A light guide plate with partitioned microstructures as described in claim 1, wherein the first microstructures, the second microstructures and the third microstructures are strip structures and extend along an extension direction parallel to the light incident surface and are arranged along an arrangement direction perpendicular to the light incident surface.

6. A light guide plate with partitioned microstructures as described in claim 5, wherein each of the first microstructures, each of the second microstructures and each of the third microstructures comprises a plurality of spaced strip substructures arranged along the extending direction.

7. A light guide plate with partitioned microstructures as described in claim 1, wherein the first microstructures, the second microstructures and the third microstructures are dotted structures, and the first reflective surface, the second reflective surface and the third reflective surface are curved surfaces.

8. The light guide plate as described in claim 1, wherein the angles of the first bottom corner, the second bottom corner, and the third bottom corner are the same.

9. A light guide plate with a partitioned microstructure as described in claim 1, wherein the distance between any two adjacent first bottom corners, the distance between any two adjacent second bottom corners, and the distance between any two adjacent third bottom corners are 0.001 mm to 2 mm.

10. A light source module, comprising: A light guide plate has a light-incident surface, a light-exit surface, and a bottom surface facing away from the light-exit surface. The light-exit surface is parallel to the bottom surface. The light-incident surface is connected to the light-exit surface and the bottom surface. The bottom surface includes: a first region disposed on the side of the bottom surface adjacent to the light-incident surface; the first region includes a plurality of first microstructures, each of which has a first reflective surface facing the light-incident surface. The area of ​​the first reflective surface of each of the first microstructures gradually increases from the light-incident surface away from it. The first reflective surface is directly connected to the bottom surface, and the distance between the connection points of any two adjacent first reflective surfaces and the bottom surface is the same. The first reflective surface and the bottom surface form a first bottom angle, and the angle of each first bottom angle in the first region is the same. A second region disposed on the side of the bottom surface away from the light-incident surface; the second region includes a plurality of second microstructures, each of which has a second reflective surface facing the light-incident surface. The area of ​​the second reflective surface of each of the second microstructures is... The distance between the first region and the second region gradually increases from near the light-receiving surface toward the light-receiving surface. The second reflective surface is directly connected to the bottom surface. The distance between any two adjacent second reflective surfaces and the bottom surface is the same. The second reflective surface and the bottom surface form a second bottom angle. The angle of each second bottom angle in the second region is the same. A third region is disposed on the bottom surface and located between the first region and the second region. The third region includes a plurality of third microstructures. Each of the third microstructures has a third reflective surface facing the light-receiving surface. The area of ​​the third reflective surface of each of the third microstructures is the same. The third reflective surface is directly connected to the bottom surface. The distance between any two adjacent third reflective surfaces and the bottom surface gradually decreases from near the light-receiving surface toward the light-receiving surface. The third reflective surface and the bottom surface form a third bottom angle. The angle of each third bottom angle in the third region is the same. At least one light-emitting element is disposed beside the light-receiving surface and is adapted to emit light to the light-receiving surface.

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