TWM603119U - Light guide plate and light source module - Google Patents

Abstract

A light guide plate includes a plate body, a plurality of strip structures and a plurality of diffusive microstructures. The plate body has a light incident surface, a first surface, and a second surface. The plurality of strip structures is disposed on the first surface. Each of the plurality of strip structures has a first end and a second end. These strip structures include a plurality of first optical structures and a plurality of second optical structures that are alternately arranged along an arrangement direction. Each of the plurality of first optical structures has a first gradual change portion. The first gradual change portion is adjacent to the first end and has a height in a direction perpendicular to the first surface, which gradually increases from the first end toward the second end. Each of the plurality of second optical structures has a second gradual change portion. The second gradual change portion is adjacent to the first end and has a height in a direction perpendicular to the first surface, which gradually decreases from the first end toward the second end. The plurality of diffusive microstructures is disposed on the second surface. 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 the display light source to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide a display light 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, in some cases, the light guide plate can be designed with a groove structure (such as V groove, R groove, etc.) to adjust the light, so that the light can achieve a specific effect (such as the control of the light direction , Scattered light, etc.), however, some optical films (such as diffusers, reflective films, etc.) when matched with this design of light guide plate, will cause adsorption due to the large-area contact between the optical film and the light guide plate. On the display screen, it is easy to cause the brightness of each area to be inconsistent, resulting in problems of dark and bright areas.

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, which can reduce the adsorption of the optical film and improve the brightness uniformity.

This creation provides a light source module that can reduce the phenomenon of adsorption between the optical film and the light guide plate, thereby improving the 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, a plurality of strip structures and a plurality of diffusion microstructures. The board has a light incident surface, a first surface and a second surface. The light incident surface is connected to the first surface and the second surface, and the first surface is opposite to the second surface. A plurality of strip structures are arranged on the first surface. Each strip-shaped structure has a first end and a second end. The first end is close to the light incident surface, and the second end is far away from the light incident surface. The strip structures include a plurality of first optical structures and a plurality of second optical structures. The first optical structures and the second optical structures extend along the extension direction and are alternately arranged along the arrangement direction, and the arrangement direction is not parallel to the extension direction. Each first optical structure has a first gradation portion, and the first gradation portion is adjacent to the first end and has a height in a direction perpendicular to the first surface gradually increasing from the first end to the second end. Each second optical structure has a second gradation portion, and the second gradation portion is adjacent to the first end and has a height in a direction perpendicular to the first surface gradually decreasing from the first end to the second end. A plurality of diffusion microstructures are arranged on the second surface.

In an embodiment of the present creation, there is an interval between each of the above-mentioned first optical structures and each of the second optical structures.

In an embodiment of the present creation, the above-mentioned plurality of strip structures further includes a plurality of pillar structures arranged in the interval, and the height of each pillar structure in the direction perpendicular to the first surface is smaller than each The maximum height of the first optical structure in a direction perpendicular to the first surface.

In an embodiment of this creation, each of the above-mentioned first optical structures and each of the second optical structures are connected to each other, and the maximum height of each first optical structure in the direction perpendicular to the first surface is equal to each The maximum height of a second optical structure in a direction perpendicular to the first surface.

In an embodiment of the present creation, each of the above-mentioned first optical structures further has a first light-emitting curved surface, and the first light-emitting curved surface has the same first radius of curvature perpendicular to the extending direction from the first end to the second end; A second optical structure further has a second light-emitting curved surface, and a second radius of curvature of the second 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, each of the above-mentioned first optical structures further has a third gradation part, which is connected to the first gradation part and extends to the second end, and the third gradation part is in a direction perpendicular to the first surface The height of φ gradually decreases from the first gradation portion toward the second end; each second optical structure further has a fourth gradation portion, which is connected to the second gradation portion and extends to the second end, and the fourth gradation portion is perpendicular to the first surface The height in the direction gradually increases from the second gradation portion toward the second end, wherein the maximum height of the first gradation portion in the direction perpendicular to the first surface is equal to the maximum height of the third gradation portion in the direction perpendicular to the first surface , Wherein the minimum height of the second gradation part in the direction perpendicular to the first surface is equal to the minimum height of the fourth gradation part in the direction perpendicular to the first surface.

In an embodiment of the present creation, the maximum heights of the multiple first optical structures and the multiple second optical structures in the direction perpendicular to the first surface are respectively less than or equal to 50 μm.

In an embodiment of the present creation, the maximum widths of the plurality of first optical structures and the plurality of second optical structures in the arrangement direction are respectively less than or equal to 300 μm.

In an embodiment of the present creation, the distance from the center of each of the above-mentioned first optical structures on the tangential plane perpendicular to the extension direction to the center of another adjacent first optical structure on the tangential plane perpendicular to the extension direction is less than Or equal to 800μm.

In an embodiment of the present creation, the shapes of the above-mentioned multiple strip structures include a semi-cylindrical shape, a triangular column shape, and a triangular column shape with rounded corners.

In an embodiment of the present creation, the aforementioned arrangement direction is parallel to the light incident surface, and the extension direction is perpendicular to the light incident surface.

In order to achieve one or part or all of the above-mentioned purposes or other purposes, the light source module provided by an embodiment of the invention includes a light-emitting element and the above-mentioned light guide plate. The light emitting element is arranged opposite to the light incident surface of the light guide plate.

In an embodiment of the present creation, the above-mentioned light source module further includes an optical film, which is arranged beside the first surface, wherein a plurality of first optical structures and a plurality of second optical structures are in contact with the optical film, and each first optical The interference area of the first gradation portion of the structure against the optical film is greater than 0 and less than or equal to 1mm ² , and the interference area of the second gradation portion of each second optical structure against the optical film is greater than 0 and less than or equal to 1mm ² .

In the light source module of this creative embodiment, the multiple strip structures of the light guide plate are designed to be non-fixed heights. The height of the first gradation portion of each first optical structure in the direction perpendicular to the first surface gradually increases from the first end to the second end, and has the maximum height adjacent to the second end; the height of each second optical structure The height of the second gradual portion in a direction perpendicular to the first surface gradually decreases from the first end to the second end, and has a maximum height adjacent to the first end. Therefore, compared to the light guide plate with a fixed-height strip structure on the surface in the prior art, when the optical film is arranged in the light source module of the light guide plate of this creative embodiment, the first gradation part is only adjacent to the second end. Contradicting to the optical film, the second gradation portion only abuts against the optical film adjacent to the first end, and then the multiple first optical structures and multiple second optical structures are alternately arranged along the arrangement direction, so that the optical film is configured When placed next to the light guide plate, the interference area can be reduced while avoiding tilting, that is, the adsorption phenomenon can be reduced, and the brightness uniformity can be improved.

In order to make the above and other purposes, features and advantages of the present creation more obvious and understandable, the following will specifically cite preferred embodiments in conjunction with the accompanying drawings, which are described in detail as follows.

1, 1a, 1b: light source module

10, 10a, 10b: light guide plate

20: Light-emitting element

30: Optical film

100: Board body

110: Glossy surface

120: First side

130: second side

200, 200a, 200b: strip structure

201: first end

202: second end

210, 210b: the first optical structure

211, 211b: first gradient

212: The first light-emitting surface

213: The third gradient

220, 220b: second optical structure

221, 221b: second gradient

222: The second light-emitting surface

223: The fourth gradient

230: Column structure

300: diffusion microstructure

A: Arrangement direction

B: direction

CR1: first radius of curvature

CR2: second radius of curvature

D1, D2: distance

E: Extension direction

G: interval

H1, H2, H3, H4, H5: height

L: light

S1, S2, S3, S4: conflict area

W1, W2: width

FIG. 1 is a three-dimensional schematic diagram of a light source module according to an embodiment of the creation.

Figure 2 is a side view of Figure 1.

FIG. 3 is a schematic diagram of the contact area of the optical film of FIG. 1 against the light guide plate.

4 is a schematic diagram of the side of the light guide plate of FIG. 1 facing 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 three-dimensional schematic diagram of a light source module according to another embodiment of the creation.

Fig. 7 is a side view of Fig. 6.

FIG. 8 is a schematic diagram of the contact area of the optical film of FIG. 6 against the light guide plate.

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. Figure 2 is a side view of Figure 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 light emitting element 20. The light guide plate 10 includes a plate body 100, a plurality of strip structures 200 and a plurality of diffusion microstructures 300. The board 100 has a light incident surface 110, a first surface 120 and a second surface 130. The light incident surface 110 is connected to the first surface 120 and the second surface 130, and the first surface 120 is opposite to the second surface 130. In this embodiment, the first surface 120 is, for example, the light-emitting surface of the board 100, but it is not limited thereto. The first surface 120 may be, for example, the bottom surface of the board body 100. The plurality of strip structures 200 are arranged on the first surface 120. The number of the plurality of strip structures 200 in FIG. 1 and FIG. 2 is only for illustration, and the present invention does not particularly limit the number of strip structures 200. Each strip-shaped structure 200 has a first end 201 and a second end 202. The first end 201 is close to the light incident surface 110, and the second end 202 is far away from the light incident surface. Smooth 110. The strip structures 200 include, for example, a plurality of first optical structures 210 and a plurality of second optical structures 220. The first optical structures 210 and the second optical structures 220, for example, extend along the extension direction E and are alternately arranged along the arrangement direction A, and the arrangement direction A is not parallel to the extension direction E. In this embodiment, the arrangement direction A is, for example, parallel to the light incident surface 110, and the extension direction E is, for example, perpendicular to the light incident surface 110, but it is not limited thereto. The light emitting element 20 is disposed opposite to the light incident surface 110 of the board 100 and is suitable for emitting light L to be incident on the light incident surface 110. Hereinafter, the structural features of the plurality of first optical structures 210 and the plurality of second optical structures 220 will be described in detail.

In this embodiment, each first optical structure 210 and each second optical structure 220 are connected to each other, but not limited to this. In another embodiment, each first optical structure 210 and each second optical structure 220 may also have a gap. Each first optical structure 210 has, for example, a first gradation portion 211. The first gradation portion 211 is adjacent to the first end 201 and has a height H1 in the direction B perpendicular to the first surface 120 from the first end 201 to the second end 202. Increasing. Each second optical structure 220 has, for example, a second gradation portion 221. The second gradation portion 221 is adjacent to the first end 201 and has a height H2 in the direction B perpendicular to the first surface 120 from the first end 201 to the second end 202 Decrease. Specifically, in this embodiment, the first gradient portion 211 extends from the first end 201 to the second end 202, and has a maximum height H1 at the second end 202; the second gradient portion 221 also extends from the first end 201 extends to the second end 202 and has a maximum height H2 at the first end 201, but not limited to this. In addition, the maximum height H1 of the first optical structure 210 is, for example, equal to the maximum height H2 of the second optical structure 220. In this embodiment, the maximum height of the first optical structure 210 is the maximum height H1 of the first gradation portion 211, and The maximum height is less than or equal to 50 μm; the maximum height of the second optical structure 220 is the maximum height H2 of the second gradation portion 221, and the maximum height is less than or equal to 50 μm.

The shapes of the plurality of strip structures 200 include, for example, a semi-cylindrical shape (as shown in FIG. 1), a triangular column shape, and a triangular column shape with rounded corners, but it is not limited to this, and the present creation does not limit the strip structure The shape of 200, as long as it can achieve the control of the light direction and the effect of dispersing the light. In this embodiment, the plurality of strip structures 200 are, for example, semi-cylindrical.

The plurality of diffusion microstructures 300 are arranged on the second surface 130. In this embodiment, the diffusing microstructure 300 may be dots or other microstructures that can diffuse light. In addition, the distribution density of the multiple diffusing microstructures 300 can also be adjusted according to different design requirements or different optical effect requirements, and this creation is not particularly limited.

The light emitting element 20 is disposed opposite to the light incident surface 110 of the board 100 and is suitable for emitting light L to be incident on the light incident surface 110. The light-emitting element 20 in FIG. 1 includes, for example, a light-emitting element 20 having a plurality of point light sources, where the point light sources are, for example, light emitting diodes (LEDs), but not limited to this. The light-emitting element 20 may also be other types of light source components, such as a lamp tube, and this creation does not limit the type of light source.

The light source module 1 further includes, for example, an optical film 30 disposed beside the first surface 120. The optical film 30 includes, for example, a diffusive sheet, a reverse diffusive sheet, a diffuser or a combination thereof, etc., and different optical films can be selected according to different design requirements or different optical effect requirements. The plurality of first optical structures 210 and the plurality of second optical structures 220 in the plurality of strip structures 200 are adapted to interfere with the optical film 30 to avoid the phenomenon of adsorption between the optical film 30 and the light guide plate 10 (FIG. 1 and FIG. In order to clearly show the multiple strip structures 200 on the first surface 120 of the light guide plate 10 in 2, the optical film 30 and the multiple strip structures 200 are shown in a separated state). FIG. 3 is a schematic diagram of the contact area of the optical film of FIG. 1 against the light guide plate. 1 to 3, when the light guide plate 10 of this embodiment is configured with the optical film 30 in the light source module 1, the first gradation portion 211 only abuts the optical film 30 at the second end 202, and has a collision area S1 , The second gradation portion 221 only abuts the optical film 30 at the first end 201, and has a collision area S2, and then alternates along the arrangement direction A by a plurality of first optical structures 210 and a plurality of second optical structures 220 The arrangement is such that when the optical film 30 is arranged beside the light guide plate 10, the contact area can be reduced, thereby reducing the adsorption phenomenon. In other embodiments, when the second surface 130 is the light-emitting surface of the board 100 and the first surface 120 is the board When the bottom surface of 100 (not shown), the optical film 30 disposed beside the first surface 120 is, for example, a reflective sheet. At this time, the first gradation portions 211 of the plurality of first optical structures 210 and the plurality of second optical structures 220 The design of the second gradation portion 221 can also reduce the contact area when the reflective sheet is disposed beside the light guide plate 10, thereby reducing the adsorption phenomenon between the reflective sheet and the light guide plate 10.

In the light source module 1 of this embodiment, the multiple strip structures 200 of the light guide plate 10 are designed to be non-fixed heights. The height H1 of the first gradation portion 211 of each first optical structure 210 in the direction B perpendicular to the first surface 120 gradually increases from the first end 201 to the second end 202, and has a maximum height H1 at the second end 202 The height H2 of the second gradual portion 221 of each second optical structure 220 in the direction B gradually decreases from the first end 201 toward the second end 202, and has a maximum height H2 at the first end 201. Therefore, compared with the light guide plate with a fixed-height strip structure on the surface in the prior art, the light guide plate 10 of this embodiment uses the multiple first optical structures 210 when the optical film 30 is arranged in the light source module 1. And the multiple second optical structures 220 are alternately arranged along the arrangement direction A, so that when the optical film 30 is arranged next to the light guide plate 10, the contact area can be reduced without tilting, that is, the adsorption phenomenon can be reduced, and the brightness can be improved. degree.

Specifically, the collision area S1 of the first gradation portion 211 of each first optical structure 210 against the optical film 30 is, for example, greater than 0 and less than or equal to 1 mm ² , but it is not limited thereto. The collision area S2 of the second gradation portion 221 of each second optical structure 220 against the optical film 30 is, for example, greater than 0 and less than or equal to 1 mm ² , but not limited to this.

4 is a schematic diagram of the side of the light guide plate of FIG. 1 facing the light emitting element. 1 and 4, each first optical structure 210 also has a first light-emitting curved surface 212. The first light-emitting curved surface 212 extends from the first end 201 to the second end 202 at a first radius of curvature CR1 perpendicular to the extension direction E. Is the same, that is, the distance from the center of each first optical structure 210 on the tangent plane perpendicular to the extension direction E to the center of another adjacent first optical structure 210 on the tangent plane perpendicular to the extension direction E (Fig. 4 The distance D1) is the same. Each second optical structure 220 also has a second light-emitting curved surface 222, and the second light-emitting curved surface 222 The second radius of curvature CR2 perpendicular to the extension direction E is the same from the first end 201 to the second end 202, that is, the center of each second optical structure 220 on the tangent plane perpendicular to the extension direction E to the adjacent other The distance from the center of the second optical structure 220 on the tangent plane perpendicular to the extension direction E (the distance D2 in FIG. 4) is the same. Specifically, regardless of whether each first optical structure 210 and each second optical structure 220 are connected to each other or have an interval, the distances D1 and D2 are, for example, less than or equal to 800 μm. However, the first radius of curvature CR1 may be the same as or different from the second radius of curvature CR2, and the present creation is not particularly limited.

When the plurality of first optical structures 210 and the plurality of second optical structures 220 in the plurality of strip structures 200 are arranged on the plate body 100, the area of interference with the optical film 30 and the light emitting effect of the light guide plate 10 need to be considered at the same time In addition to the above-mentioned preferred numerical ranges of heights H1, H2 and distances D1, D2, the maximum width W1 of the plurality of first optical structures 210 in the arrangement direction A is, for example, less than or equal to 300 μm (as shown in FIG. 4 The width W1 is not the maximum width of the first optical structure 210, but the width W1 still satisfies the condition of less than or equal to 300 μm). The maximum width W2 of the plurality of second optical structures 220 in the arrangement direction A is, for example, less than or equal to 300 μm.

In other embodiments, each first optical structure 210 and each second optical structure 220 are spaced, for example, and the space can be a blank area or other optical structures. FIG. 5 is a three-dimensional schematic diagram of a light source module according to another embodiment of the creation. Please refer to FIG. 5, 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, each first optical structure 210 and each second optical structure 210 There is a gap G between the optical structures 220, and the plurality of strip structures 200a of the light guide plate 10a further includes a plurality of pillar structures 230 arranged in the gap G. This creation does not limit the shape of the pillar structure 230, as long as it can achieve the control of the light emitting direction and the effect of dispersing the light. Specifically, the plurality of pillar structures 230 between each first optical structure 210 and each second optical structure 220 are, for example, connected to each first optical structure 210 and each second optical structure 220. Considering the shape of the first optical structure 210 and the second optical structure 220 The shape and arrangement manner, the extending direction of each pillar structure 230 is not parallel to the extending direction E (as shown in FIG. 5), but it is not limited thereto.

The height H3 of the plurality of pillar structures 230 in the direction B is, for example, the same, but not limited thereto. The height H3 of each pillar structure 230 is, for example, smaller than the maximum height H1 of each first optical structure 210 adjacent to the second end 202 in the direction B, and may be greater or smaller than that of each first optical structure 210 adjacent in the direction B The minimum height H1 of the first end 201. In FIG. 5, the height H3 of each pillar structure 230 is greater than the minimum height H1 of each first optical structure 210 as an example. The height H3 of each pillar structure 230 is, for example, also smaller than the maximum height H2 of each second optical structure 220 adjacent to the first end 201 in the direction B, and may be greater or smaller than the maximum height H2 of each second optical structure 220 in the direction B Adjacent to the minimum height H2 of the second end 202, in FIG. 5, the height H3 of each pillar structure 230 is greater than the minimum height H2 of each second optical structure 220 as an example. In addition, in the embodiment of FIG. 5, since the second optical structure 220 and the pillar structure 230 are arranged between the first optical structures 210, the center of each first optical structure 210 on the section perpendicular to the extension direction E The distance to the center of another adjacent first optical structure 210 on the tangent plane perpendicular to the extension direction E may be greater than the distance D1 in the embodiment of FIG. 4, and may even be close to 800 μm. Similarly, due to the second optical structure A first optical structure 210 and a pillar structure 230 are arranged between 220. Each second optical structure 220 is perpendicular to the extension from the center of the tangent plane perpendicular to the extension direction E to the adjacent second optical structure 220. The distance from the center of the tangent plane in the direction E may be greater than the distance D2 in the embodiment of FIG. 4, and may even be close to 800 μm.

In the light source module of this embodiment, according to different design requirements or different optical effect requirements, adjustments are required to reduce the collision area of the plurality of first optical structures 210 and the plurality of second optical structures 220 against the optical film 30. The number of the first optical structures 210 and the second optical structures 220 is increased to increase the density of the arrangement. Alternatively, the number of gradation parts for each first optical structure 210 and each second optical structure 220 can be increased. FIG. 6 is a three-dimensional schematic diagram of a light source module according to another embodiment of the creation. Fig. 7 is a side view of Fig. 6. Please refer to Figures 6 and 7, the light source model of this embodiment Group 1b is similar to the above-mentioned light source module 1 in structure and advantages, and only the main differences of the structure are described below. In the light source module 1b of this embodiment, the plurality of strip structures 200b of the light guide plate 10b include a plurality of first optical structures 210b and a plurality of second optical structures 220b. Each first optical structure 210b also has a third gradient portion 213 connected to the first gradient portion 211b and extending to the second end 202. The height H4 of the third gradient portion 213 in the direction B perpendicular to the first surface 120 is from The first gradient portion 211b gradually decreases toward the second end 202. Each second optical structure 220b also has a fourth gradation portion 223 connected to the second gradation portion 221b and extending to the second end 202. The height H5 of the fourth gradation portion 223 in the direction B is from the second gradation portion 221b toward the first The two ends 202 gradually increase. Specifically, the maximum height H1 of the first gradation portion 211b in the direction B is equal to the maximum height H4 of the third gradation portion 213 in the direction B. The minimum height H2 of the second gradation portion 221b in the direction B is equal to the minimum height H5 of the fourth gradation portion 223 in the direction B.

In this embodiment, each first optical structure 210b uses two gradation portions (first gradation portion 211b and third gradation portion 213) as an example, and each second optical structure 220b also has two gradation portions (second gradation portion). The portion 221b and the fourth gradient portion 223) are taken as examples, but not limited to this. The present invention does not limit the number of gradation parts of each first optical structure 210 and each second optical structure 220.

FIG. 8 is a schematic diagram of the contact area of the optical film of FIG. 6 against the light guide plate. 6 to 8, when the light guide plate 10b of this embodiment is configured with the optical film 30 in the light source module 1b, the first gradation portion 211b and the third gradation portion 213 jointly abut against the optical film 30 and have a contact area S3. The second gradation portion 221b only abuts the optical film 30 at the first end 201 and has an abutment area S2, and the fourth gradation portion 223 only abuts the optical film 30 at the second end 202 and has an abutment area S4. The multiple first optical structures 210 and the multiple second optical structures 220 are alternately arranged along the arrangement direction A, so that when the optical film 30 is disposed beside the light guide plate 10, the contact area can be reduced, thereby reducing the adsorption phenomenon. At the same time, when the number of the first optical structures 210 is the same as the number of the first optical structures 210b, and the number of the second optical structures 220 is the same as the number of the second optical structures 220b, the light guide plate 10b and the optical The collision area of the film 30 will be more than the collision surface of the light guide plate 10 and the optical film 30 Therefore, the light source modules 1, 1b can be selected according to different design requirements or different optical effect requirements.

To sum up, in the light source module of this creative embodiment, the multiple strip structures of the light guide plate are designed to be non-fixed heights. The height of the first gradation portion of each first optical structure in the direction perpendicular to the first surface gradually increases from the first end to the second end, and has the maximum height adjacent to the second end; the height of each second optical structure The height of the second gradual portion in a direction perpendicular to the first surface gradually decreases from the first end to the second end, and has a maximum height adjacent to the first end. Therefore, compared to the light guide plate with a fixed-height strip structure on the surface in the prior art, when the optical film is arranged in the light source module of the light guide plate of this creative embodiment, the first gradation part is only adjacent to the second end. Contradicting to the optical film, the second gradation portion only abuts against the optical film adjacent to the first end, and then the multiple first optical structures and multiple second optical structures are alternately arranged along the arrangement direction, so that the optical film is configured When placed next to the light guide plate, the interference area can be reduced while avoiding tilting, that is, the adsorption phenomenon can be reduced, and the brightness uniformity can be improved.

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 the 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: Light source module

10: Light guide plate

20: Light-emitting element

30: Optical film

100: Board body

110: Glossy surface

120: First side

130: second side

200: Strip structure

201: first end

202: second end

210: The first optical structure

211: The first gradient

220: second optical structure

221: second gradient

A: Arrangement direction

E: Extension direction

L: light

Claims (13)

A light guide plate, including: A plate body having a light incident surface, a first surface and a second surface, the light incident surface is connected to the first surface and the second surface, and the first surface is opposite to the second surface; A plurality of strip structures are arranged on the first surface, each of the strip structures has a first end and a second end, the first end is close to the light incident surface, and the second end is far away from the light incident surface , The strip structures include a plurality of first optical structures and a plurality of second optical structures, the first optical structures and the second optical structures extend along an extension direction and are alternately arranged along an arrangement direction, the arrangement The direction is not parallel to the extending direction, each of the first optical structures has a first gradation portion, the first gradation portion is adjacent to the first end and has a height in the direction perpendicular to the first surface from the first The end gradually increases toward the second end, and each of the second optical structures has a second gradation portion, and the second gradation portion is adjacent to the first end and has a height in a direction perpendicular to the first surface from the first surface. One end gradually decreases toward the second end; and A plurality of diffusion microstructures are arranged on the second surface. The light guide plate according to claim 1, wherein there is an interval between each of the first optical structures and each of the second optical structures. The light guide plate according to claim 2, wherein the strip structures further include a plurality of pillar structures arranged in the interval, and each of the pillar structures is arranged in a direction perpendicular to the first surface The height is smaller than the maximum height of each of the first optical structures in the direction perpendicular to the first surface. The light guide plate according to claim 1, wherein each of the first optical structures and each of the second optical structures are connected to each other, and each of the first optical structures is perpendicular to the first surface The maximum height in the direction is equal to the maximum height of each of the second optical structures in the direction perpendicular to the first surface. The light guide plate according to claim 1, wherein each of the first optical structures further has a first light-emitting curved surface, and the first light-emitting curved surface has a first radius of curvature perpendicular to the extending direction from the first end to The second ends are the same; each of the second optical structures further has a second light-emitting curved surface, and the second light-emitting curved surface has a second radius of curvature perpendicular to the extending direction from the first end to the second end For the same. The light guide plate according to claim 1, wherein each of the first optical structures further has a third gradation part connected to the first gradation part and extending to the second end, and the third gradation part is perpendicular to The height in the direction of the first surface gradually decreases from the first gradation portion toward the second end; each of the second optical structures further has a fourth gradation portion, connected to the second gradation portion and extending to the first end At two ends, the height of the fourth gradation portion in a direction perpendicular to the first surface gradually increases from the second gradation portion toward the second end, wherein the first gradation portion is in a direction perpendicular to the first surface The maximum height of is equal to the maximum height of the third gradation portion in the direction perpendicular to the first surface, wherein the minimum height of the second gradation portion in the direction perpendicular to the first surface is equal to the fourth gradation portion in the vertical direction The minimum height in the direction of the first surface. The light guide plate according to claim 1, wherein the maximum height of the first optical structures and the second optical structures in a direction perpendicular to the first surface is less than or equal to 50 μm. The light guide plate according to claim 1, wherein the maximum widths of the first optical structures and the second optical structures in the arrangement direction are respectively less than or equal to 300 μm. The light guide plate according to claim 1, wherein the center of each of the first optical structures on the cutting plane perpendicular to the extending direction to the center of the adjacent other first optical structure on the cutting plane perpendicular to the extending direction The distance between the centers of the faces is less than or equal to 800 μm. The light guide plate according to claim 1, wherein the shapes of the optical structures include a semi-cylindrical shape, a triangular column shape, and a triangular column shape with rounded corners. The light guide plate according to claim 1, wherein the arrangement direction is parallel to the light incident surface, and the extension direction is perpendicular to the light incident surface. A light source module includes: A light guide plate, including: A plate body having a light incident surface, a first surface and a second surface, the light incident surface is connected to the first surface and the second surface, and the first surface is opposite to the second surface; A plurality of strip structures are arranged on the first surface, each of the strip structures has a first end and a second end, the first end is close to the light incident surface, and the second end is far away from the light incident surface , The strip structures include a plurality of first optical structures and a plurality of second optical structures, the first optical structures and the second optical structures extend along an extension direction and are alternately arranged along an arrangement direction, the arrangement The direction is not parallel to the extending direction, each of the first optical structures has a first gradation portion, the first gradation portion is adjacent to the first end and has a height in the direction perpendicular to the first surface from the first The end gradually increases toward the second end, and each of the second optical structures has a second gradation portion, and the second gradation portion is adjacent to the first end and has a height in a direction perpendicular to the first surface from the first surface. One end gradually decreases toward the second end; and A plurality of diffusion microstructures are arranged on the second surface; and A light emitting element is arranged opposite to the light incident surface of the light guide plate. The light source module according to claim 12, further comprising an optical film disposed beside the first surface, wherein the first optical structures and the second optical structures are in contact with the optical film, and each of the first optical structures The collision area of the first gradation part of an optical structure against the optical film is greater than 0 and less than or equal to 1 mm ² , and the collision area of the second gradation part of each of the second optical structures against the optical film is Greater than 0 and less than or equal to 1mm ² .

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