TWM602647U - Light guide plate and light source module - Google Patents

Abstract

A light guide plate includes a plate body and a plurality of strip-shaped microstructures. The plate body has a light incident surface, a light exit surface and a bottom surface. The light exit surface is adjacent to the light incident surface, and the light exit surface is opposite to the bottom surface. The plurality of strip-shaped microstructures is disposed on the light exit surface. Each of the plurality of strip-shaped microstructures has a first end and a second end and extends along an extension direction. The first end is close to the light incident surface, and the second end is far from the light incident surface. Each of the plurality of strip-shaped microstructures has a first gradual change portion. The first gradual change portion is adjacent to the first end and has a height and a width on a section perpendicular to the extension direction, which gradually increase from the first end toward the second end. The plate body and the plurality of first gradual change portions have a through hole, which penetrate the plurality of first gradual change portions from the bottom surface of the plate body. A light source module having the light guide plate is further provided.

Description

Light guide plate and light source module

This creation is related to a light source module, and particularly to a light guide plate and a light source module using the light guide plate.

Generally, a liquid crystal display device includes a liquid crystal display panel and a backlight module, and since the liquid crystal display panel itself does not emit light, it is necessary to rely on the backlight module to provide an illuminating light 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.

Backlight modules can be divided into side-type backlight modules and direct-type backlight modules. In the current side-lit backlight module, a ridge structure is designed on the light-emitting surface of the light guide plate to improve the brightness uniformity of the light. However, when the edge-type backlight module is applied to electronic devices such as mobile phones or tablets, in order to correspond to its appearance, there will be a chamfered or perforated design on the light guide plate, because the chamfered or perforated design will reflect light , So that the current beam structure at the chamfered corners and perforations of the light guide plate has too high brightness, resulting in uneven brightness and darkness.

This "prior art" paragraph is only used to help understand the content of this creation. Therefore, the content disclosed in the "prior art" may contain some conventional technologies that do not constitute the common knowledge in the technical field. In addition, the content disclosed in the "prior art" does not represent the content or the problem to be solved by one or more embodiments of this creation, nor does it mean that it has been used by a person with ordinary knowledge in the technical field before this creation application. Know or recognize.

This creation provides a light guide plate that can improve brightness uniformity.

This creation provides a light source module that can improve brightness uniformity.

Other purposes and advantages of this creation can be further understood from the technical features disclosed in this creation.

In order to achieve one or part or all of the above objectives or other objectives, the light guide plate provided by an embodiment of the present creation includes a plate body and a plurality of strip-shaped microstructures. The board has a light-incident surface, a light-emitting surface and a bottom surface, the light-emitting surface is adjacent to the light-incident surface, and the light-emitting surface is opposite to the bottom surface. A plurality of strip-shaped microstructures are arranged on the light-emitting surface. Each strip-shaped microstructure has a first end and a second end, and extends along the extending direction. The first end is far away from the light incident surface, and the second end is close to the light incident surface. Each strip-shaped microstructure has a first gradation part, the first gradation part is adjacent to the first end, and the height and width of the first gradation part on a section perpendicular to the extending direction gradually increase from the first end to the second end. The plate body and the plurality of first gradation parts have through holes, and the first gradation parts penetrate through the bottom surface of the plate body.

In an embodiment of the present creation, the two corners of the above-mentioned board on the side away from the light incident surface are respectively chamfered.

In an embodiment of the present creation, the above-mentioned light-emitting surface has two first blank areas, which are respectively adjacent to two corners, and a plurality of strip-shaped microstructures are not distributed in the two first blank areas.

In an embodiment of the present creation, each of the above-mentioned strip-shaped microstructures further has a second gradation part, which is connected to the first gradation part and extends to the second end. The height of the second gradation part on the section perpendicular to the extension direction And the width gradually increases from the second end toward the first end.

In an embodiment of the present creation, the connection between the aforementioned first gradation part and the second gradation part is rounded and chamfered.

In an embodiment of the present creation, each of the above-mentioned strip-shaped microstructures further has a light-emitting curved surface, and the radius of curvature of the light-emitting curved surface perpendicular to the extending direction is the same from the first end to the second end.

In an embodiment of this creation, the radius of curvature of the above-mentioned light-emitting curved surface perpendicular to the extending direction is 10um ~ 300um.

In an embodiment of the present creation, each of the above-mentioned strip-shaped microstructures further has a flat part and a second gradation part. The flat part is connected between the first gradation part and the second gradation part, and the flat part is perpendicular to the extension direction. The height and width of the cut surface are the same, and the height and width of the second gradient portion on the cut surface perpendicular to the extending direction gradually increase from the second end to the first end.

In an embodiment of the present creation, the minimum height of the above-mentioned first gradation portion on the tangent plane perpendicular to the extending direction is 0.1um-2um.

In an embodiment of the present creation, the maximum height of the above-mentioned first gradation portion on the tangent plane perpendicular to the extending direction is 5um-20um.

In an embodiment of the present creation, the aforementioned through hole is located in at least one of the plurality of first gradation portions.

In an embodiment of the present creation, the aforementioned plurality of strip-shaped microstructures are arranged along the arrangement direction parallel to the light incident surface, and the extension direction is perpendicular to the light incident surface.

In an embodiment of the present creation, the above-mentioned multiple strip-shaped microstructures are arranged on the entire surface of the light emitting surface.

In an embodiment of the present creation, the aforementioned light-emitting surface has a second blank area adjacent to the through hole, and the plurality of first gradation portions are not distributed in the second blank area.

In order to achieve one or part or all of the above objectives or other objectives, the light source module provided by an embodiment of the invention includes a plurality of light emitting elements and the above light guide plate. A plurality of light emitting elements are arranged opposite to the light incident surface of the board.

In the light source module of this creative embodiment, the light guide plate has through holes, so it can be used in electronic devices such as mobile phones or tablets equipped with lenses. The light-emitting surface of the board is configured with a plurality of strip-shaped microstructures, each strip-shaped microstructure has a first gradation part, and the height and width of the first gradation part on the cut surface perpendicular to the extending direction are from the first end away from the light entrance surface It gradually increases toward the second end close to the light incident surface, and the through holes penetrate the first gradation portions from the bottom surface of the board. In the configuration of the first gradation part, when the height is lower, the ratio of the height to the width is smaller, which can reduce the light output effect, improve the situation that the through hole reflects the light and cause the brightness to be too high, and then improve the light output surface of the light guide plate The overall brightness uniformity.

In order to make the above and other purposes, features and advantages of this creation more obvious and easy to understand, the following is a detailed description of preferred embodiments in conjunction with the accompanying drawings.

The aforementioned and other technical content, features and effects of this creation will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit this creation.

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the creation. Fig. 2 is a schematic cross-sectional view of the section line AA' in Fig. 1. Please refer to FIG. 1 and FIG. 2, the light source module 1 of this embodiment includes a light guide plate 10 and a plurality of light emitting elements 20. The light guide plate 10 includes a plate body 100 and a plurality of strip-shaped microstructures 200. The board 100 has a light-incident surface 110, a light-emitting surface 120 and a bottom surface 130. The light-emitting surface 120 is adjacent to the light-incident surface 110, and the light-emitting surface 120 is opposite to the bottom surface 130. In this embodiment, the light incident surface 110 is connected between the light output surface 120 and the bottom surface 130, for example. The plurality of strip-shaped microstructures 200 are arranged on the light-emitting surface 120. Each strip-shaped microstructure 200 has a first end 201 and a second end 202, which are arranged along the arrangement direction A parallel to the light incident surface 110 and extend along the extension direction E. The extension direction E is, for example, perpendicular to the light incident surface 110, but is not limited thereto. The first end 201 is far away from the light incident surface 110, and the second end 202 is close to the light incident surface 110. The second ends 202 of the plurality of strip-shaped microstructures 200 are, for example, disposed adjacent to the light incident surface 110, but not limited to this. In another embodiment, the second end 202 may also be arranged close to but not connected to the light incident surface 110.

The plurality of light emitting elements 20 are arranged opposite to the light incident surface 110 of the board 100 and are suitable for emitting light L to be incident on the light incident surface 110. The number of light-emitting elements 20 in FIG. 1 is three as an example, but it is not limited thereto. The light emitting element 20 can be a light emitting diode (LED), an organic light emitting diode (OLED), or a laser diode (LD), etc., but this creation is not limited Type of light source.

Each strip-shaped microstructure 200 has a first gradation portion 210, and the height and width of the first gradation portion 210 adjacent to the first end 201 and on a section perpendicular to the extension direction E gradually increase from the first end 201 to the second end 202. In this embodiment, the first gradual change portion 210 extends from the first end 201 to the second end 202, but it is not limited to this. 3A is a schematic cross-sectional view of the first gradation portion of the strip-shaped microstructure in FIG. 1 adjacent to the first end. 3B is a schematic cross-sectional view of the first gradual change portion of the strip-shaped microstructure in FIG. 1 adjacent to the second end. Referring to FIGS. 1, 3A and 3B, each strip-shaped microstructure 200 has a light-emitting curved surface 203, and the radius of curvature CR of the light-emitting curved surface 203 perpendicular to the extending direction E is the same from the first end 201 to the second end 202. Specifically, in the manufacturing process of the light guide plate 10, a tool with a fixed curvature is used to cut the mold, so that the mold core has a fixed curvature, and each strip-shaped microstructure 200 on the light guide plate 10 formed by the mold core is also Has a fixed curvature. In this embodiment, the shape of each strip-shaped microstructure 200 is, for example, the same, and each strip-shaped microstructure 200 is arranged at equal intervals, for example. Therefore, since the radius of curvature CR is the same from the first end 201 to the second end 202, the distance D between the centers of any two adjacent strip microstructures 200 is both in the section of FIG. 3A and the section of FIG. 3B. It is the same, but the present creation does not particularly limit the design and configuration of the plurality of strip-shaped microstructures 200. Specifically, the radius of curvature CR is, for example, 10 um to 300 um, but it is not limited thereto.

Under the above configuration, the first gradation portion 210 of each strip-shaped microstructure 200 has a maximum height H1 adjacent to the first end 201 and a maximum width W1 in the arrangement direction A, as shown in FIG. 3A; each strip-shaped microstructure The first gradation portion 210 of the 200 adjacent to the second end 202 has a maximum height H2 and a maximum width W2 in the arrangement direction A, as shown in FIG. 3B. Since the curvature radius CR of the light-emitting curved surface 203 is the same from the first end 201 to the second end 202, the ratio of the maximum height H1 to the maximum width W1 of the first gradation portion 210 adjacent to the first end 201 will be smaller than that of the first gradation portion 210 The ratio of the maximum height H2 adjacent to the second end 202 to the maximum width W2. When the ratio is small, the light-emitting effect of the light guide plate 10 will be reduced; when the ratio is large, the light-emitting effect of the light guide plate 10 will be improved. In this embodiment, the minimum height H1 is, for example, 0.1um-2um, and the maximum height H2 is, for example, 5um-20um, but it is not limited to this.

In this embodiment, the plurality of first gradation portions 210 of the plurality of strip-shaped microstructures 200 are separated from each other near the first end 201, for example, and the plurality of first gradation portions 210 adjacent to the second end 202 are, for example, connected to each other. , But not limited to this. In another embodiment, the first gradient portions 210 of the plurality of strip-shaped microstructures 200 are separated from each other near the first end 201, for example, and the first gradient portions 210 near the second end 202 are also separated from each other, for example. Separation (not shown). In addition, the shape of the strip-shaped microstructure 200 is, for example, a semi-cylindrical shape, but is not limited thereto.

1 and 2 again, the plate body 100 and the plurality of first gradation parts 210 have through holes 140, the first gradation parts 210 are penetrated from the bottom surface 130 of the plate body 100, and the through holes 140 are located in the first gradation parts.部210 in at least one of them. In this embodiment, the number of through holes 140 is, for example, one, but it is not limited thereto. The size of the through hole 140 can be adjusted according to different design requirements. When the diameter of the through hole 140 is larger, the through hole 140 may be located at two or more of the first gradation portions 210, as shown in FIG. 1; When the aperture of the through hole 140 is small, the through hole 140 may be located only in one of the first gradation portions 210. The cross-sectional view of FIG. 2 depicts the through hole 140 for convenience of description, and it is not limited that the cross-sectional view of the light guide plate 10 must have the through hole 140.

The two corners on the side of the board 100 away from the light incident surface 110 are chamfers 101 and 102, but not limited to this. For example, the chamfers 101 and 102 may also be two corners on the side close to the light incident surface 110. In this embodiment, the positions of the chamfers 101 and 102 correspond to the first ends 201 of the plurality of strip-shaped microstructures 200, that is, adjacent to a portion of the plurality of first gradation portions 210.

4 is a schematic diagram of the side of the light guide plate of FIG. 1 far away from the light-emitting element. Please refer to FIG. 1, FIG. 2 and FIG. 4, in order to save processing cost and time, the chamfers 101 and 102 and the aforementioned through holes 140 are processed after the plurality of strip-shaped microstructures 200 are arranged on the light guide plate 10. Therefore, the through holes 140 penetrate the first gradation portions 210 from the bottom surface 130 of the board body 100. In addition, since the height of each first gradation portion 210 on any plane perpendicular to the extension direction E is the same, but due to the design of the chamfers 101 and 102, the multiple strip-shaped microstructures near the chamfers 101 and 102 The length of 200 will be truncated, so that the length of the strip-shaped microstructures 200 closer to the chamfers 101 and 102 will be shorter. Therefore, the initial of the first gradation parts 210 near the chamfers 101 and 102 is The heights H3 and H4 will be greater than the initial height H5 of the plurality of first gradation parts 210 at the part away from the chamfers 101 and 102, and among the first gradation parts 210 at the part close to the chamfers 101 and 102, the distance from the second The initial height H3 of the first gradation portion 210 that is closer to the end 202 (that is, the length is shorter) will also be greater than the initial height H4 of the first gradation portion 210 that is farther from the second end 202 (that is, the length is longer), such as Shown in Figure 1 and Figure 4. It should be noted that the maximum height H1 of the first gradient portion 210 adjacent to the first end 201 in FIG. 3A is based on the initial height H5 in FIG. 4 as an example, so the cut surface in FIG. 3A is not shown due to the chamfer configuration. A plurality of first gradation portions 210 near the chamfers 101 and 102 are formed, so that the width of the plate body 100 parallel to the arrangement direction A in FIG. 3A is also smaller than that of the section of the plate body 100 in FIG. 3B parallel to the arrangement direction A. The width on the top.

In the light source module 1 of this embodiment, the light guide plate 10 has chamfered corners 101, 102 and through holes 140, so it can be used in electronic devices such as mobile phones or tablets equipped with rounded chamfered frames and lenses. The light-emitting surface 120 of the plate 100 is configured with a plurality of strip-shaped microstructures 200, each strip-shaped microstructure 200 has a first gradation portion 210, and the height and width of the first gradation portion 210 on the section perpendicular to the extending direction E are from away from The first end 201 of the light incident surface 110 gradually increases toward the second end 202 close to the light incident surface 110, and the through holes 140 penetrate the first gradation portions 210 from the bottom surface 130 of the board 100. In the configuration of the first gradation portion 210, the lower the height, the smaller the ratio of the height to the width, which can reduce the light output effect, and improve the situation where the chamfers 101, 102 and through holes 140 reflect light and cause excessive brightness , Thereby improving the overall brightness uniformity of the light-emitting surface 120 of the light guide plate 10.

1 and 2 again, in order to further enhance the above effect, the light source module 1 of this embodiment has, for example, the following design: the light-emitting surface 120 of the board 100 has two first blank areas 121, 122 and a second blank area 123. The two first blank areas 121 and 122 are respectively adjacent to the two chamfers 101 and 102, and the plurality of strip-shaped microstructures 200 are not distributed in the two first blank areas 121 and 122. The second blank area 123 is adjacent to the through hole 140, and the plurality of first gradient portions 210 are not distributed in the second blank area 123. In FIGS. 1 and 2, the two first blank areas 121 and 122 and the second blank area 123 are represented by areas enclosed by dashed lines. With the arrangement of the two first blank areas 121, 122 and the second blank area 123, the light emission effect near the two chamfers 101, 102 and the through hole 140 can be further adjusted, but not limited to this. According to different design requirements, the two first blank areas 121, 122 and the second blank area 123 can be configured separately, or, in another embodiment, a plurality of strip-shaped microstructures 200 are, for example, disposed on the entire surface of the light emitting surface 120. That is, it does not have the two first blank areas 121, 122 and the second blank area 123 described above.

FIG. 5 is a three-dimensional schematic diagram of a light source module according to another embodiment of the creation. Fig. 6 is a schematic cross-sectional view of the section line BB' in Fig. 5. FIG. 7A is a schematic cross-sectional view of the second gradation portion of the strip-shaped microstructure in FIG. 1 adjacent to the second end. 7B is a schematic cross-sectional view of the other end of the second gradual change portion of the strip-shaped microstructure in FIG. 1 away from the second end. Please refer to FIG. 5, FIG. 6, FIG. 7A and FIG. 7B. The light source module 1a of this embodiment is similar in structure and advantages to the light source module 1 described above. The only difference is that in the light source module 1a of this embodiment, the light guide plate 10a Each of the strip-shaped microstructures 200a further has, for example, a second gradient portion 220. The height and width of the first gradation portion 210a adjacent to the first end 201 and on the section perpendicular to the extension direction E gradually increase from the first end 201 to the second end 202, and the second gradation portion 220 is, for example, connected to the first gradation portion 210a and extend to the second end 202. The height and width of the second gradual portion 220 on the section perpendicular to the extension direction E gradually increase from the second end 202 toward the first end 201.

The second gradient portion 220 of each strip-shaped microstructure 200a has a maximum height H6 and a maximum width W6 in the arrangement direction A adjacent to the second end 202, as shown in FIG. 7A; the second gradient portion of each strip-shaped microstructure 200a The other end of 220 away from the second end 202 has a maximum height H7 and a maximum width W7 in the arrangement direction A, as shown in FIG. 7B. When the shape of each strip-shaped microstructure 200a is, for example, the same, and each strip-shaped microstructure 200a is, for example, arranged at equal intervals, since the radius of curvature CR of the light-emitting curved surface 203 is the same from the first end 201 to the second end 202, Therefore, the ratio of the maximum height H6 to the maximum width W6 of the second gradation portion 220 adjacent to the second end 202 is smaller than the ratio of the maximum height H7 to the maximum width W7 of the other end of the second gradation portion 220 away from the second end 202. When the ratio is small, the light-emitting effect of the light guide plate 10a will be reduced; when the ratio is large, the light-emitting effect of the light guide plate 10a will be improved. In this embodiment, the maximum height H6 is, for example, 0.1um-2um, and the maximum height H7 is, for example, 5um-20um, but it is not limited to this. Since the second gradation portion 220 of each strip-shaped microstructure 200a of this embodiment is connected to the first gradation portion 210a, the maximum height H2 may be the same as the maximum height H7, but is not limited thereto.

In this embodiment, the length F1 of the first gradation portion 210a of each strip-shaped microstructure 200a in the extending direction E is half of the length F2 of each strip-shaped microstructure 200a in the extending direction E, and the first gradation portion 210a of each strip-shaped microstructure 200a The length F3 of the two gradation portions 220 in the extension direction E is also half of the length F2 of each strip-shaped microstructure 200a in the extension direction E, but is not limited thereto. The length F1 of the first gradual portion 210a in the extending direction E can be adjusted according to different design requirements.

In this embodiment, the plurality of second gradation portions 220 of the plurality of strip-shaped microstructures 200a are separated from each other near the second end 202, for example, and the other end of the plurality of second gradation portions 220 away from the second end 202 is, for example, Connected to each other, but not limited to this. In another embodiment, the plurality of second gradient portions 220 of the plurality of strip-shaped microstructures 200a are separated from each other near the second end 202, for example, and the other end of the plurality of second gradient portions 220 away from the second end 202 is, for example, They are also separated from each other (not shown).

In the light source module 1a of this embodiment, each strip-shaped microstructure 200a further has a second gradation portion 220, and the height and width of the second gradation portion 220 on the tangent plane perpendicular to the extension direction E are from the first near the light incident surface 110 The two ends 202 gradually increase toward the first end 201 that is selected away from the light incident surface 110. When the height is lower, the ratio of the height to the width becomes smaller, which can reduce the light output effect of the side of the light exit surface 120 adjacent to the light entrance surface 110, and improve the brightness of the side of the light exit surface 120 adjacent to the light entrance surface 110. Uniform hot spot phenomenon. The higher the height, the greater the ratio of the height to the width, which can improve the light output effect and improve the situation that the light output surface 120 will be farther away from the light entrance surface 110 and the light output will have insufficient brightness.

The connection between the first gradient portion 210 and the second gradient portion 220 of each strip-shaped microstructure 200a has an included angle θ, and the included angle θ in this embodiment is, for example, a round chamfer. The rounded chamfer of the included angle θ in this embodiment can avoid the bright line phenomenon that may be caused by the excessively concentrated light, and make the light more even. The radius of curvature of the round chamfer is, for example, 40 mm, but it is not limited thereto.

Figure 8 is another embodiment of the strip-shaped microstructure of the present creation. 6 and 8, in the strip-shaped microstructure 200a of this embodiment, in the embodiment of FIG. 6, the maximum height of the first gradual portion 210a gradually increases in a linear manner from the first end 201 to the second end 202 , That is, the light-emitting curved surface 203 of the first gradation portion 210a is an inclined straight line on the cross-sectional view of FIG. 2. In other embodiments of FIG. 8, the maximum height of the first gradient portion 210a gradually increases from the first end 201 to the second end 202, for example, in a non-linear manner, that is, the light-emitting curved surface 203 of the first gradient portion 210a is shown in FIG. It is a sloping curve. The same design is also applicable to the second gradation portion 220 and the first gradation portion 210 of the previous embodiment, and will not be repeated here. The designs of the first gradation part 210a and the second gradation part 220 can also be used separately, and the creation is not particularly limited.

9 is a schematic cross-sectional view of a light source module according to another embodiment of the creation. Please refer to FIG. 9, the light source module 1b of this embodiment is similar to the above-mentioned light source module 1a in structure and advantages. The only difference is that in the light source module 1b of this embodiment, each strip-shaped microstructure 200b on the light guide plate 10b is also There is a flat part 230. The flat portion 230 is, for example, connected between the first gradient portion 210b and the second gradient portion 220a, but is not limited to this. The height and width (not shown in the figure) of the flat portion 230 on the cut surface perpendicular to the extension direction E are the same. In this embodiment, the length F1 of the first gradation portion 210b of each strip-shaped microstructure 200b in the extension direction E is 1/3 of the length F2 of each strip-shaped microstructure 200b in the extension direction E, and each strip-shaped microstructure 200b The length F3 of the second gradual portion 220a in the extension direction E is also 1/3 of the length F2 of each strip-shaped microstructure 200b in the extension direction E, and the length F4 of the flat portion 230 of each strip-shaped microstructure 200b in the extension direction E It is also 1/3 of the length F2 of each strip-shaped microstructure 200b in the extension direction E, but not limited to this. The lengths F1, F3, F4 can be adjusted according to different design requirements.

The connection between the first gradual portion 210b and the flat portion 230 of each strip-shaped microstructure 200b has an included angle θ1, and the connection between the second gradual portion 220a and the flat portion 230 has an included angle θ2, and the included angles θ1 and θ2 in this embodiment are, for example, The advantages and effects of round chamfering are the same as the above-mentioned included angle θ, which will not be repeated here.

The strip-shaped microstructure 200b used in the light source module 1b can also use a design in which the maximum height of the gradation portion gradually increases in a non-linear manner as shown in FIG. 8, and this creation is not particularly limited. The shape of the strip-shaped microstructure 200b is not limited to a semi-cylindrical shape.

To sum up, in the light source module of this creative embodiment, the light guide plate is designed with chamfers and through holes, so it can be used in electronic devices such as mobile phones or tablets equipped with rounded beveled frames and lenses. The light-emitting surface of the board is configured with a plurality of strip-shaped microstructures, each strip-shaped microstructure has a first gradation part, and the height and width of the first gradation part on the cut surface perpendicular to the extending direction are from the first end away from the light entrance surface It gradually increases toward the second end close to the light incident surface, and the through holes penetrate the first gradation portions from the bottom surface of the board. In the configuration of the first gradation part, when the height is lower, the ratio of the height to the width is smaller, which can reduce the light output effect, improve the chamfering and the situation that the brightness of the through hole is too high due to the reflection of light, thereby improving the light guide plate The overall brightness uniformity of the light-emitting surface. In addition, each of the strip-shaped microstructures also has a second gradation part, and the height and width of the second gradation part on the tangent surface perpendicular to the extending direction gradually increase from the second end close to the light incident surface to the first end away from the light incident surface. increase. When the height is lower, the ratio of height to width is smaller, which can reduce the light output effect on the side of the light exit surface adjacent to the light entrance surface, and improve the hot spot phenomenon of uneven brightness on the side of the light exit surface adjacent to the light entrance surface. . When the height is higher, the ratio of the height to the width is larger, which can improve the light output effect and improve the situation that the light output surface will be far away from the light input surface and the light output will have insufficient brightness.

However, the above are only the preferred embodiments of this creation, and should not be used to limit the scope of implementation of this creation, that is, simple equivalent changes and modifications made according to the scope of patent application and new description of this creation, All are still within the scope of this creation patent. In addition, any embodiment of this creation or the scope of the patent application does not have to achieve all the purposes or advantages or features disclosed in the creation. In addition, the abstract part and title are only used to assist the search of patent documents, not to limit the scope of rights of this creation. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the element (element) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. Upper or lower limit.

1, 1a, 1b: light source module 10, 10a, 10b: light guide plate 20: Light-emitting element 100: Board body 101, 102: chamfer 110: Glossy surface 120: Glossy Surface 121, 122: first blank area 123: second blank area 130: bottom 140: Through hole 200, 200a, 200b: strip microstructure 201: first end 202: second end 203: Light emitting surface 210, 210a, 210b: the first gradient 220, 220a: second gradient 230: flat part A: Arrangement direction AA’, BB’: cut line CR: radius of curvature D: spacing E: Extension direction F1, F2, F3, F4: length H1, H2, H6, H7: Maximum height H3, H4, H5: initial height W1, W2, W6, W7: Maximum width L: light θ, θ1, θ2: included angle

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the creation. Fig. 2 is a schematic cross-sectional view of the section line AA' in Fig. 1. 3A is a schematic cross-sectional view of the first gradation portion of the strip-shaped microstructure in FIG. 1 adjacent to the first end. 3B is a schematic cross-sectional view of the other end of the first gradual change portion of the strip-shaped microstructure in FIG. 1 away from the first end. 4 is a schematic diagram of the side of the light guide plate of FIG. 1 far away from the light-emitting element. FIG. 5 is a three-dimensional schematic diagram of a light source module according to another embodiment of the creation. Fig. 6 is a schematic cross-sectional view of the section line BB' in Fig. 5. FIG. 7A is a schematic cross-sectional view of the second gradation portion of the strip-shaped microstructure in FIG. 5 adjacent to the second end. 7B is a schematic cross-sectional view of the second gradual change portion of the strip-shaped microstructure in FIG. 5 away from the second end of the other end. Figure 8 is another embodiment of the strip-shaped microstructure of the present creation. 9 is a schematic cross-sectional view of a light source module according to another embodiment of the creation.

1: Light source module

10: Light guide plate

20: Light-emitting element

100: Board body

101, 102: chamfer

110: Glossy surface

120: Glossy Surface

121, 122: first blank area

123: second blank area

130: bottom

140: Through hole

200: Strip microstructure

201: first end

202: second end

203: Light emitting surface

210: The first gradient

A: Arrangement direction

AA’: Cut line

E: Extension direction

L: light

Claims (15)

A light guide plate, including: A board having a light-incident surface, a light-emitting surface, and a bottom surface, the light-emitting surface is adjacent to the light-incident surface, and the light-emitting surface is opposite to the bottom surface; and A plurality of strip-shaped microstructures are disposed on the light-emitting surface, each of the strip-shaped microstructures has a first end and a second end, and extends along an extension direction. The first end is away from the light-incident surface, and the The second end is close to the light-incident surface, each of the strip-shaped microstructures has a first gradation portion, the first gradation portion is adjacent to the first end, and the first gradation portion is on a cut surface perpendicular to the extending direction The height and width of the upper part gradually increase from the first end toward the second end, The board and the first gradation portions have a through hole, and the first gradation portions penetrate through the bottom surface of the board. The light guide plate according to claim 1, wherein two corners of the side of the plate body away from the light incident surface are respectively chamfered. The light guide plate according to claim 2, wherein the light-emitting surface has two first blank areas, respectively adjacent to the two corners, and the strip-shaped microstructures are not distributed in the two first blank areas. The light guide plate according to claim 1, wherein each of the strip-shaped microstructures further has a second gradation part connected to the first gradation part and extending to the second end, and the second gradation part is perpendicular to The height and width of the cut surface in the extending direction gradually increase from the second end to the first end. The light guide plate according to claim 4, wherein the connection between the first gradation part and the second gradation part is a round chamfer. The light guide plate according to claim 1, wherein each of the strip-shaped microstructures further has a light-emitting curved surface, and the radius of curvature of the light-emitting curved surface perpendicular to the extending direction is the same from the first end to the second end. The light guide plate according to claim 6, wherein the radius of curvature of the light-emitting curved surface perpendicular to the extending direction is 10um ~ 300um. The light guide plate according to claim 1, wherein each of the strip-shaped microstructures further has a flat part and a second gradation part, and the flat part is connected between the first gradation part and the second gradation part, The height and width of the flat portion on the cut surface perpendicular to the extension direction are the same, and the height and width of the second gradual portion on the cut surface perpendicular to the extension direction gradually increase from the second end toward the first end. increase. The light guide plate according to claim 1, wherein the minimum height of the first gradation portion on the cutting plane perpendicular to the extending direction is 0.1um-2um. The light guide plate according to claim 1, wherein the maximum height of the first gradation portion on the cut surface perpendicular to the extending direction is 5um-20um. The light guide plate according to claim 1, wherein the through hole is located in at least one of the first gradient portions. The light guide plate according to claim 1, wherein the strip-shaped microstructures are arranged along an arrangement direction parallel to the light incident surface, and the extension direction is perpendicular to the light incident surface. The light guide plate according to claim 1, wherein the strip-shaped microstructures are arranged on the entire surface of the light emitting surface. The light guide plate according to claim 1, wherein the light emitting mask has a second blank area adjacent to the through hole, and the first gradation portions are not distributed in the second blank area. A light source module includes: A light guide plate, including: A board having a light-incident surface, a light-emitting surface, and a bottom surface, the light-emitting surface is adjacent to the light-incident surface, and the light-emitting surface is opposite to the bottom surface; and A plurality of strip-shaped microstructures are arranged on the light-emitting surface, each of the strip-shaped microstructures has a first end and a second end, and extends along an extension direction. The first end is close to the light-incident surface, and the The second end is far away from the light-incident surface, each of the strip-shaped microstructures has a first gradation part, the first gradation part is adjacent to the first end, and the first gradation part is on a cut surface perpendicular to the extending direction The height and width of the upper part gradually increase from the first end toward the second end, The plate body and the first gradation parts have a through hole, and the first gradation parts penetrate through the bottom surface of the plate; and A plurality of light emitting elements are arranged opposite to the light incident surface of the board.

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