CN210401732U

CN210401732U - Light guide plate and light source module

Info

Publication number: CN210401732U
Application number: CN201921650963.0U
Authority: CN
Inventors: 陈俊伟; 葛达标; 刘光宇
Original assignee: Nano Precision Suzhou Co Ltd; Coretronic Corp
Current assignee: Nano Precision Suzhou Co Ltd; Coretronic Corp
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-04-24
Anticipated expiration: 2029-09-30

Abstract

The utility model provides a light guide plate has into plain noodles and first face, goes into the plain noodles and connects in first face. One side of the first surface, which is adjacent to the light incident surface, is provided with a plurality of microstructure areas which are arranged at intervals along the side. Each microstructure area is provided with a plurality of prism columns which extend along the side and are arranged along the arrangement direction vertical to the light incident surface. The light emitting elements are arranged opposite to the light incident surface and used for emitting light rays to enter the light incident surface and the prism columns. Each light emitting element is correspondingly arranged between two adjacent micro-structure areas, and a space is reserved between every two light emitting elements. A light source module including the light guide plate and a plurality of light emitting elements is also provided. The utility model provides a light guide plate and light source module have the efficiency that promotes the luminance degree of consistency.

Description

Light guide plate and light source module

Technical Field

The present invention relates to a light source module, and more particularly to a light guide plate and a light source module using the same.

Background

In general, 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, the backlight module is required to provide a 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 luminance and high uniformity.

The backlight module can be divided into a side-in type backlight module and a direct type backlight module. In the conventional side-in backlight module, a plurality of light emitting diodes are disposed beside a light guide plate, especially the light emitting diodes are arranged at intervals, and emitted light enters the light guide plate to generate a bright area and a dark area between the two light emitting diodes.

The prior art solves the problem that the area which is easy to generate hot spot phenomenon is shielded, namely the uneven brightness of the light guide plate close to the side light source is excluded from the display area. However, the frame of the display panel may be widened and the area of the display area may be reduced.

The background section is provided to aid in understanding the present invention, and therefore the disclosure of the background section may include some prior art that does not constitute a part of the knowledge of one skilled in the art. Furthermore, the disclosure of the "background" does not represent a representation of the disclosure or the problems that may be solved by one or more embodiments of the present invention, or of what is known or appreciated by those of ordinary skill in the art prior to filing the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a light guide plate can promote the luminance degree of consistency.

The utility model provides a light source module can promote the luminance degree of consistency.

Other objects and advantages of the present invention can be obtained from the technical features disclosed in the present invention.

In order to achieve one or a part of or all of the above or other objects, an embodiment of the present invention provides a light guide plate having a light incident surface and a first surface. The light incident surface is connected with the first surface, and one side of the first surface, which is adjacent to the light incident surface, is provided with a plurality of microstructure areas which are arranged at intervals along the side. Each microstructure area is provided with a plurality of prism columns which extend along the side and are arranged along the arrangement direction vertical to the light incident surface.

In order to achieve one or a part of or all of the above or other objects, an embodiment of the invention provides a light source module including the light guide plate and a plurality of light emitting elements. The light emitting elements are arranged opposite to the light incident surface and used for emitting light rays to enter the light incident surface and the prism columns. Each light emitting element is correspondingly arranged between two adjacent micro-structure areas, and a space is reserved between every two light emitting elements.

The utility model discloses in the light source module, the adjacent income plain noodles in one side of first face of light guide plate has along this side interval arrangement's a plurality of micro-structure district, and each light emitting component correspondence sets up between two adjacent micro-structure districts. When light emitted by the light emitting elements is incident on the light guide plate, part of the light is emitted through the microstructure area, and the brightness of the light guide plate corresponding to the area between the two light emitting elements is improved. Compare in the hot spot phenomenon in the bright dark zone that current light source module had, the utility model discloses a light source module can promote the luminance degree of consistency.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic perspective view of a light source module according to an embodiment of the present invention.

Fig. 2 is a partial side view schematic of fig. 1.

Fig. 3 is a schematic partial side view of a light source module according to another embodiment of the present invention.

Fig. 4 is a schematic partial cross-sectional view of a light guide plate according to another embodiment of the present invention.

Fig. 5A to 5C are different embodiments of the microstructure area on the light guide plate according to the present invention.

Fig. 6A to 6D are different embodiments of the prism column of the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 1 is a schematic perspective view of a light source module according to an embodiment of the present invention. Fig. 2 is a partial side view schematic of fig. 1. Referring to fig. 1, a light source module 10 of the present embodiment includes a light guide plate 100 and a plurality of light emitting elements 200. The light guide plate 100 has a light incident surface 110 and a first surface 120, and the light incident surface 110 is connected to the first surface 120. The first surface 120 has a plurality of microstructure regions 121 arranged along a side thereof adjacent to the light incident surface 110 at intervals, for example, along the direction B. The plurality of microstructure regions 121 are disposed adjacent to the light incident surface 110, and the distances D1 between any two adjacent microstructure regions 121 are the same, but the invention is not limited thereto. In another embodiment, according to different design requirements, the plurality of microstructure regions 121 may be disposed close to but not connected to the light incident surface 110, and the distance D1 between any two adjacent microstructure regions 121 may also be selectively different. In the present embodiment, each microstructure area 121 is provided with a plurality of prism columns 1211, and the prism columns 1211 protrudes from the first surface 120, for example, but not limited thereto. The prism columns 1211 extend along the side and are arranged along an arrangement direction a perpendicular to the light incident surface 110. Specifically, the prism columns 1211 extends in a direction parallel to the extending direction B of the light incident surface 110, for example. Except for the microstructure regions 121, the first surface 120 is exposed in a region of the first surface 120 adjacent to the light incident surface 110.

Fig. 2 is a partial side view schematic of fig. 1. Referring to fig. 1 and fig. 2, the light emitting elements 200 are disposed opposite to the light incident surface 110 and are used for emitting light L to enter the light incident surface 110 and the prism columns 1211. Each light emitting element 200 is correspondingly disposed between two adjacent microstructure regions 121, and a distance D2 exists between each light emitting element 200. Specifically, the distance D2 is, for example, a distance between an edge of one light emitting element 200 and an edge of another adjacent light emitting element 200 (as shown in fig. 1). Each microstructure region 121 is disposed at a distance D2, and each light emitting element 200 is disposed at a distance D1. Specifically, taking fig. 1 as an example, the length of the prism columns 1211 in the extending direction B is less than or equal to the distance D2 between each light emitting element 200, but is not limited thereto.

In the present embodiment, the number of the microstructure regions 121 in fig. 1 is 5 for example, and the number of the light emitting elements 200 is 4 for example, but not limited thereto. In the case of corresponding configuration, the number of the microstructure regions 121 and the number of the light emitting elements 200 are not particularly limited.

The prism columns 1211 shown in fig. 1 and 2 are exemplified by the shape of a triangular column, but is not limited thereto. For example, the prism columns 1211 may be semi-circular columns, and the term "semi-circular column" does not limit the shape thereof to be semi-circular, as long as the top of the prism columns 1211 is a cambered surface.

The light emitting element 200 is used for providing the light L, and the light emitting element 200 can be a Light Emitting Diode (LED), but the present invention is not limited to the type of the light source.

In the present invention, referring to fig. 1, the light incident surface 110 may selectively include a plurality of light uniformizing microstructures 111 for making the light L emitted from the light emitting element 200 diverge, so that the light L entering the light guide plate 100 via the light incident surface 110 is uniform. The plurality of light uniformizing microstructures 111 are, for example, semi-cylindrical prism columns, i.e., conventional R-cut structures, but are not limited thereto. In other embodiments, the light incident surface 110 may be a mirror surface, that is, the light uniformizing microstructures 111 or any microstructures are not disposed on the light incident surface 110, but the light uniformizing microstructures are in a mirror surface state.

Referring to fig. 2, the light guide plate 100 further has a second surface 130 opposite to the first surface 120, the second surface 130 is connected to the light incident surface 110, and has a plurality of microstructures 131. In the present embodiment, the microstructures 131 may be dots or other microstructures capable of diffusing light. Specifically, the first surface 120 is a light emitting surface of the light guide plate 100, and the second surface 130 is a bottom surface of the light guide plate 100.

In the light source module 10 of the present embodiment, a plurality of microstructure regions 121 are disposed at intervals along a side of the first surface 120 of the light guide plate 100 adjacent to the light incident surface 110, each microstructure region 121 is provided with a plurality of prism columns 1211, the prism columns 1211 extend along an extending direction B parallel to the light incident surface 110, and each light emitting element 200 is correspondingly disposed between two adjacent microstructure regions 121. Therefore, when the light L emitted by the light emitting elements 200 enters the light guide plate 100, a portion of the light L is transmitted laterally through the prism 1211 of the microstructure area 121 and exits, thereby increasing the brightness of the light guide plate 100 corresponding to the area between the two light emitting elements 200 (e.g., the microstructure area 121). And since the prism columns 1211 extend along the extending direction B (parallel to the light incident surface 110), the light L can be transmitted in the transverse direction with a better efficiency. Compared with the hot spot phenomenon of the bright and dark regions of the conventional light source module, the light source module 10 of the present embodiment can improve the brightness uniformity.

In addition, the length Le1 of the microstructure area 121 in the arrangement direction a, the arrangement distance (i.e., the length Le1) of the prism columns 1211 in the arrangement direction a can be adjusted according to different design requirements, for example, the distance D2 between each light emitting device 200, or the brightness and the light emitting angle of the light emitting device 200 all affect the size of the area with dark brightness on the side of the light guide plate adjacent to the light incident surface, so by adjusting the length Le1 of the microstructure area 121, the area with uneven brightness can be reduced. Compared with the conventional light source module, the light source module 10 of the present embodiment can improve the brightness uniformity, i.e., the area of the light guide plate with non-uniform brightness is less. Therefore, when the light source module 10 is applied to a display device, the display panel can be designed to have a larger display area and a narrower frame.

Fig. 3 is a schematic partial side view of a light source module according to another embodiment of the present invention. Referring to fig. 3, the light source module 10a of the present embodiment has a similar structure and advantages to the light source module 10 of fig. 2, and only the main differences of the structure will be described below. Compared to the light source module 10, the light source module 10a of the present embodiment further includes a reflective sheet 300 disposed beside the first surface 120a, and the light guide plate 100a further has a second surface 130a opposite to the first surface 120a and is connected to the light incident surface 110. The first face 120a also has a plurality of microstructures 122. In the present embodiment, the microstructures 122 may be dots or other microstructures capable of diffusing light. After the light L emitted from the light emitting device 200 enters the light guide plate 100a, a portion of the light L is transmitted and emitted laterally through the prism 1211 of the microstructure area 121, and is reflected by the reflective sheet 300 to enter the light guide plate 100a and then emitted from the second surface 130a, or is diffused by the microstructures 122 and then emitted from the second surface 130 a. Specifically, in the present embodiment, the first surface 120a is a bottom surface of the light guide plate 100a, and the second surface 130a is a light emitting surface of the light guide plate 100 a.

Fig. 4 is a schematic partial cross-sectional view of a light guide plate according to another embodiment of the present invention. Referring to fig. 4, the light guide plate 100b of the present embodiment has a similar structure and advantages to the light guide plate 100 of fig. 2, but the difference is that the first surface 120b of the light guide plate 100b of the present embodiment, each of the microstructure regions 121a further includes a groove 1212, and the plurality of prism columns 1211 are disposed in the groove 1212. The light guide plate 100b of the present embodiment may also be applied to the

light source modules

10 and 10a, and the present invention is not limited thereto. It is particularly noted that the maximum height of the prism columns 1211 relative to the bottom of the groove 1212 is not greater than the depth of the groove 1212, i.e. the prism columns 1211 do not protrude from the first surface 120b, but the invention is not limited thereto.

Fig. 5A to 5C are different embodiments of the microstructure area on the light guide plate according to the present invention. Referring to fig. 1 and fig. 5A to 5C, the microstructure area 121 on the light guide plate 100 of the present invention may have different shapes, such as a rectangle (fig. 5A), a triangle (fig. 5B), or a semicircle (fig. 5C). When the microstructure region 121 has a rectangular shape, for example, the lengths Le2 of the prism columns 1211 in the extending direction B parallel to the light incident surface 110 are the same. When the microstructure area 121 has a triangular or semicircular shape, for example, the length Le2 of the prism columns 1211 in the extending direction B parallel to the light incident surface 110 decreases gradually toward the direction away from the light incident surface 110, i.e., the length Le2 of the prism column 1211 closest to the light incident surface is the longest. The shapes of the different microstructure areas 121 can be selected corresponding to the areas with darker brightness on the light guide plate, and can be used in a mixed manner according to different design requirements, so that the plurality of microstructure areas 121 have different shapes respectively. Specifically, the projection shape of each prism 1211 on the light incident surface 110 may be rectangular, or may have different shapes according to the shape profile of the microstructure area 121, for example, the microstructure area 121 is triangular, and the projection shape of each prism 1211 on the light incident surface 110 may be rectangular or trapezoidal.

Fig. 6A to 6D are different embodiments of the prism column of the present invention. Referring to fig. 2 and fig. 6A to 6D, the height h of each prism 1211 of the prism columns 1211 in fig. 2 relative to the first surface 120 is, for example, but not limited thereto. The height h here refers to the shortest distance of each prism column 1211 from the first face 120 to the top thereof. Fig. 6A to 6D illustrate embodiments in which the plurality of prism columns 1211 have different heights, and each height h of the plurality of prism columns 1211 in fig. 6A is gradually decreased from the middle to both sides in the arrangement direction a; in FIG. 6B, the direction of arrangement A increases from the middle toward both sides; in fig. 6C, the heights h of the prism columns 1211 decrease in the direction away from the light incident surface 110 in the arrangement direction a; and in fig. 6D, the heights h of the prism columns 1211 increase in the direction away from the light incident surface 110 in the arrangement direction a.

The above-mentioned factors regarding the shape of the prism 1211, the shape of the microstructure area 121, the heights of the prism 1211 and the like can be adjusted according to different design requirements and used in a mixed manner, and the present invention is not limited in particular.

To sum up, the utility model discloses an among the light source module, the adjacent income plain noodles in first face of light guide plate one side has along this side interval arrangement's a plurality of micro-structure district, and each light emitting component correspondence sets up between two adjacent micro-structure districts. When light emitted by the light emitting elements is incident on the light guide plate, part of the light is emitted through the microstructure area, and the brightness of the light guide plate corresponding to the area between the two light emitting elements is improved. Compare in the hot spot phenomenon in the bright dark zone that current light source module had, the utility model discloses a light source module can promote the luminance degree of consistency. In addition, when the display panel is applied to a display device, the display panel can have a larger display area and a narrower frame.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the contents of the specification should be included in the scope of the present invention. Moreover, it is not necessary for any embodiment or claim of the invention to address all of the objects, advantages, or features disclosed herein. Furthermore, the abstract and the title of the specification are provided only for assisting the retrieval of patent documents and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like in the description and in the claims are used for naming elements (elements) or distinguishing between different embodiments or ranges, and are not intended to limit the upper or lower limit on the number of elements.

Claims

1. A light guide plate is characterized by comprising a light incident surface and a first surface, wherein the light incident surface is connected with the first surface, one side of the first surface, which is adjacent to the light incident surface, is provided with a plurality of microstructure areas which are arranged at intervals along the side, wherein each microstructure area is provided with a plurality of prism columns, and the prism columns extend along the side and are arranged along the arrangement direction which is vertical to the light incident surface.

2. The light guide plate according to claim 1, wherein the light guide plate further comprises a second surface opposite to the first surface, the second surface is connected to the light incident surface and has a plurality of microstructures.

3. The light guide plate according to claim 1, wherein the pitches between the plurality of microstructure regions are the same.

4. The light guide plate of claim 1, wherein the heights of the plurality of prism columns with respect to the first face are the same.

5. The light guide plate of claim 1, wherein the height of the prism columns relative to the first surface decreases gradually from the middle to both sides in the arrangement direction, increases gradually from the middle to both sides in the arrangement direction, decreases gradually in a direction away from the light incident surface, or increases gradually in a direction away from the light incident surface.

6. The light guide plate according to claim 1, wherein each of the plurality of microstructure regions has a shape comprising a rectangle, a triangle, or a semicircle.

7. The light guide plate of claim 1, wherein the prism columns have the same length in a direction parallel to the light incident surface.

8. The light guide plate of claim 1, wherein the length of the prism columns in the direction parallel to the light incident surface decreases toward the direction away from the light incident surface.

9. The light guide plate of claim 1, wherein each of the plurality of microstructure areas further comprises a groove, and the plurality of prism columns are disposed in the groove.

10. The light guide plate according to claim 1, wherein the plurality of prism columns comprise triangular columns and semi-cylindrical columns.

11. A light source module comprises a light guide plate and a plurality of light emitting elements,

the light guide plate is provided with a light incident surface and a first surface, the light incident surface is connected with the first surface, one side of the first surface, which is adjacent to the light incident surface, is provided with a plurality of microstructure areas which are arranged at intervals along the side, wherein each microstructure area is provided with a plurality of prism columns, and the prism columns extend along the side and are arranged along the arrangement direction which is vertical to the light incident surface;

the plurality of light emitting elements are arranged opposite to the light incident surface and used for emitting light rays to enter the light incident surface and the plurality of prism columns, wherein each light emitting element is correspondingly arranged between two adjacent microstructure areas, and a space is formed between each light emitting element.

12. The light source module of claim 11, further comprising a reflector disposed beside the first surface, wherein the light guide plate further has a second surface opposite to the first surface and connected to the light incident surface.

13. The light source module of claim 11, wherein the length of the prism columns in a direction parallel to the light incident surface is less than or equal to the spacing between each of the light emitting elements.