CN210294593U

CN210294593U - Light guide plate and light source module

Info

Publication number: CN210294593U
Application number: CN201921634979.2U
Authority: CN
Inventors: 张玉钢; 杨越峰; 刘光宇
Original assignee: Nano Precision Suzhou Co Ltd
Current assignee: Nano Precision Suzhou Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2020-04-10
Anticipated expiration: 2029-09-29

Abstract

A light guide plate is provided with a first light incident surface and a first surface, wherein the first light incident surface is connected with the first surface. The side of the first surface adjacent to the first light incident surface is provided with a plurality of protruding structures, wherein each protruding structure is provided with a second light incident surface and a total reflection curved surface. The total reflection curved surface is connected with the first surface and the second light incident surface. The utility model discloses provide a light source module who has this light guide plate in addition. The utility model discloses a light guide plate and light source module can promote 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, and when the light emitting diodes are arranged at intervals, light emitted from the light guide plate enters a bright area corresponding to the light emitting diodes and a dark area between the two light emitting diodes.

The solution of the prior art is to arrange a full-face prism structure on the light guide plate to achieve the effect of light uniformization. However, this method increases the cost of the light guide plate manufacturing process.

The background section is provided to aid in understanding the present invention, and therefore the disclosure of the background section may include other art that does not constitute a part of the common general knowledge of the skilled person. Furthermore, the statements in the "background" section do not represent that section or the problems which may be solved by one or more embodiments of the present invention, nor are they intended to be known or appreciated by those skilled in the art prior to 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 further understood 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 first light incident surface and a first surface, the first light incident surface being connected to the first surface. The side of the first surface adjacent to the first light incident surface is provided with a plurality of protruding structures, wherein each protruding structure is provided with a second light incident surface and a total reflection curved surface. The total reflection curved surface is connected with the first surface and the second light incident surface.

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 source module including a light guide plate and a plurality of light emitting elements. The light guide plate is provided with a first light incident surface and a first surface, and the first light incident surface is connected with the first surface. The side of the first surface adjacent to the first light incident surface is provided with a plurality of protruding structures, wherein each protruding structure is provided with a second light incident surface and a total reflection curved surface. The total reflection curved surface is connected with the first surface and the second light incident surface. The total reflection curved surface is provided with a first side edge and a second side edge, the first side edge is connected to the first surface, the second side edge is connected to the second light incident surface, the first side edge faces away from the arc shape of the second light incident surface, the arc top is arranged, and the second side edge faces away from the arc shape of the first surface. The light emitting elements are arranged opposite to the first light incident surface of the light guide plate and are suitable for emitting light rays to enter the light guide plate through the second light incident surface and the first light incident surface of each protruding structure. Each light emitting element is arranged between two adjacent arc tops, and a space is reserved between any two adjacent light emitting elements.

The utility model discloses among the light source module, the adjacent income plain noodles one side in first face of light guide plate has a plurality of protruding structures, and each protruding structure has the total reflection curved surface, and the total reflection curved surface has the first side of connecting in first face, and the second income plain noodles bellied arc is kept away from for the orientation to the first side to the arc top has. Each light-emitting element is arranged between two adjacent arc tops. When the light emitted by the light-emitting element is incident to the total reflection curved surface of the protruding structure, the light can be totally reflected into the light guide plate, and the curved surface of the arc-shaped and/or total reflection curved surface of the first side edge enables the light to converge towards the arc top, so that the brightness of the light guide plate corresponding to the areas on two sides of each light-emitting element is improved. Compare in the hot spot phenomenon in the bright dark zone that known 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 top schematic view of fig. 1.

Fig. 3 is a partial side view schematic of fig. 1.

Fig. 4A is a schematic diagram of an arrangement of a plurality of bump structures according to another embodiment of the present invention.

Fig. 4B is a schematic diagram of an arrangement of a plurality of bump structures according to another embodiment of the present invention.

Fig. 5 is a schematic partial side view of a light source module according to another embodiment of the present invention.

Detailed Description

The foregoing and other features, aspects and utilities of the present invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in 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 top schematic view of fig. 1. Fig. 3 is a partial side view schematic of fig. 1. Referring to fig. 1 to 3, a light source module 1 of the present embodiment includes a light guide plate 10 and a plurality of light emitting elements 20. The light guide plate 10 has a first light incident surface 11 and a first surface 12, and the first light incident surface 11 is connected to the first surface 12. The first surface 12 has a plurality of protrusion structures 100 on a side thereof adjacent to the first light incident surface 11. Each of the protrusion structures 100 has a second light incident surface 110 and a total reflection curved surface 120. The total reflection curved surface 120 connects the first surface 12 and the second light incident surface 110. According to different design requirements, the plurality of protrusion structures 100 are disposed near but not connected to the first light incident surface 11, or disposed adjacent to the first light incident surface 11 as shown in fig. 1 to 3. The curved total reflection surface 120 has a first side 121 and a second side 122, the first side 121 is connected to the first surface 12, and the second side 122 is connected to the second incident surface 110. The first side edge 121 is, for example, an arc shape protruding away from the second light incident surface 110 and has an arc top a1 (as shown in fig. 2), and a distance H1 from the arc top a1 to the second light incident surface 110 is the farthest distance of the first side edge 121 relative to the second light incident surface 110. In the present embodiment, the distance H1 is, for example, 1mm to 8 mm. The second side edge 122 is, for example, an arc shape protruding away from the first face 12 and has an arc top a2 (as shown in fig. 1 and 3), and a distance H2 from the arc top a2 to the first face 12 is a farthest distance of the second side edge 122 relative to the first face 12. In the present embodiment, the distance H2 is, for example, 0.05mm to 0.5 mm. Specifically, the external shape of the protruding structure 100 is similar to a cut sphere. However, the curvature of the total reflection curved surface 120 is not particularly limited, and the second light incident surface 110 is not limited to a semicircular shape.

The plurality of protrusion structures 100 are, for example, but not limited to, arranged along the arrangement direction E parallel to the first light incident surface 11. In the present embodiment, the second light incident surface 110 and the first light incident surface 11 of each protrusion structure 100 are, for example, located on the same reference plane P, and in detail, the second light incident surface 110 is, for example, a plane and is coplanar with the first light incident surface 11, but is not limited thereto. In other embodiments, the second light incident surface 110 may also be a curved surface or an irregular surface.

The light emitting elements 20 are disposed opposite to the first light incident surface 11 of the light guide plate 10, and are adapted to emit light L to enter the light guide plate 10 through the second light incident surface 110 and the first light incident surface 11 of each protrusion structure 100. Each light emitting element 20 is disposed between two adjacent arc tops a1, and a distance D is provided between any two adjacent light emitting elements 20. In other words, the arc top a1 of each protrusion structure 100 corresponds to the distance D between two adjacent light-emitting elements 20, for example. The light emitting elements 20 are arranged along the extending direction E, and the distance D between each light emitting element 20 is the same, but not limited thereto. In the present embodiment, the distance D is, for example, 3mm to 12 mm. The distance D in the present embodiment refers to, for example, a distance between centers of any two adjacent light emitting elements 20 (as shown in fig. 1 and fig. 2), or, in another embodiment, may also refer to a distance between an edge of one light emitting element 20 and an edge of another adjacent light emitting element 20. In the present embodiment, each light emitting element 20 is further disposed between two adjacent arc tops a2, for example, that is, the arc top a2 of each protrusion structure 100 corresponds to the distance D (as shown in fig. 1) between two adjacent light emitting elements 20, for example.

The number of the bump structures 100 in fig. 1 is 4, and the number of the light emitting elements 20 is 3, but not limited thereto. The present invention is not particularly limited to the number of the bump structures 100 and the number of the light emitting elements 20 in accordance with the corresponding arrangement relationship.

The light emitting element 20 is used for providing the light L, and the light emitting element 20 can be a Light Emitting Diode (LED), but the present invention is not limited to the type of the light source.

The light guide plate 10 further has a second surface 13 opposite to the first surface 12, the second surface 13 is connected to the light incident surface 11, and has a plurality of microstructures 1301. In this embodiment, the microstructure 1301 can be a dot or other microstructure capable of diffusing light. Specifically, the first surface 12 is a light emitting surface of the light guide plate 10, and the second surface 13 is a bottom surface of the light guide plate 10.

In the light source module 1 of the present embodiment, a plurality of protrusion structures 100 are disposed on a side of the first surface 12 of the light guide plate 10 adjacent to the light incident surface 11, each protrusion structure 100 has a total reflection curved surface 120, the total reflection curved surface 120 has a first side edge 121 connected to the first surface 12, the first side edge 121 is an arc shape protruding toward the second light incident surface 110 and has an arc top a 1. Each light emitting element 20 is disposed between two adjacent arc tops a 1. When the light L emitted by the light emitting element 20 is incident on the total reflection curved surface 120 of the protrusion structure 100, the light L is totally reflected into the light guide plate 10, and the arc shape of the first side 121 and/or the curved surface of the total reflection curved surface 120 make the light L converge toward the arc top a1, so as to improve the brightness of the light guide plate 10 corresponding to the areas on the two sides of each light emitting element 20. Compared with the conventional light source module, the brightness of the light source module can be improved by 30%. Therefore, the light source module 1 of the present embodiment can improve the brightness uniformity and reduce the hot spot phenomenon in the bright and dark regions. On the other hand, besides the light incident surface 11 of the light guide plate 10, the second light incident surface 110 of each protrusion structure 100 can also receive the light L emitted by the light emitting element 20, thereby improving the light utilization rate.

In addition, the distance H1 from the arc top a1 of the protrusion structure 100 to the second light incident surface 110 can be adjusted according to design requirements, such as the distance D between any two adjacent light emitting elements 20, or the size of a dark area on the side of the light guide plate adjacent to the light incident surface. 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 have a larger display area and a narrower frame.

In the present embodiment, the maximum width W of the second light incident surface 110 of each protrusion structure 100 in the extending direction E is the same as the distance D between two adjacent light emitting elements 20, but not limited thereto. Specifically, when the maximum width W of the second light incident surface 110 in the extending direction E is the same as the pitch D, each of the protrusion structures 100 is disposed separately and the edges are in contact. Fig. 4A is a schematic diagram of an arrangement of a plurality of bump structures according to another embodiment of the present invention. Fig. 4B is a schematic diagram of an arrangement of a plurality of bump structures according to another embodiment of the present invention. Referring to fig. 4A and 4B, according to different design requirements, the plurality of bump structures 100a are, for example, arranged at intervals (as shown in fig. 4A), or the plurality of bump structures 100B are integrally connected as shown in fig. 4B, and the connection position of the plurality of bump structures 100B is similar to the cut plane, as shown by the dotted line in fig. 4B.

Fig. 5 is a schematic partial side view of a light source module according to another embodiment of the present invention. Referring to fig. 5, the light source module 1a of the present embodiment has a similar structure and advantages to the light source module 1 described above, and only the main differences of the structure will be described below. In the light source module 1a of this embodiment, the first surface 12a of the light guide plate 10a further has a plurality of microstructures 1201 distributed outside the plurality of protrusion structures 100. In this embodiment, the microstructures 1201 can be dots or other microstructures that can diffuse light. After entering the light guide plate 10a, the light L emitted from the light emitting element 20 is diffused by the microstructures 1201 and then emitted from the second surface 13 a. Specifically, in the present embodiment, the first surface 12a is a bottom surface of the light guide plate 10a, and the second surface 13a is a light emitting surface of the light guide plate 10 a. In addition, according to different design requirements, the design of the plurality of

protrusion structures

100a and 100b can also be applied to the light source modules 1 and 1a, which is not particularly limited by the present invention.

To sum up, the utility model discloses an among the light source module, one side that the adjacent income plain noodles in first face of light guide plate has a plurality of protruding structures, and each protruding structure has the total reflection curved surface, and the total reflection curved surface has the first side of connecting in first face, and the second income plain noodles bellied arc is kept away from for the orientation to the first side to the arc top has. Each light-emitting element is arranged between two adjacent arc tops. When the light emitted by the light-emitting element is incident to the total reflection curved surface of the protruding structure, the light can be totally reflected into the light guide plate, and the curved surface of the arc-shaped and/or total reflection curved surface of the first side edge enables the light to converge towards the arc top, so that the brightness of the light guide plate corresponding to the areas on two sides of each light-emitting element is improved. Compare in the hot spot phenomenon in the bright dark zone that known light source module had, the utility model discloses a light source module can promote the luminance degree of consistency, when being applied to display device, also can make display panel have great display area and narrower frame. On the other hand, besides the light incident surface of the light guide plate, the second light incident surface of each protrusion structure can also receive light rays emitted by the light emitting element, so that the light utilization rate is improved.

However, 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 present invention are still 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. In addition, the abstract and the utility model name are only used for assisting the retrieval of patent documents and are not used for limiting the scope of the 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 in that the light guide plate is provided with a first light incident surface and a first surface, the first light incident surface is connected to the first surface, one side, adjacent to the first light incident surface, of the first surface is provided with a plurality of protruding structures, each protruding structure is provided with a second light incident surface and a total reflection curved surface, and the total reflection curved surface is connected with the first surface and the second light incident surface.

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

3. The light guide plate according to claim 1, wherein the first surface further comprises a plurality of microstructures, and the plurality of microstructures are distributed outside the plurality of protruding structures.

4. The light guide plate according to claim 1, wherein the plurality of protrusion structures are arranged along an arrangement direction parallel to the first light incident surface.

5. The light guide plate of claim 1, wherein the second light incident surface and the first light incident surface of each of the plurality of protrusion structures are located on a same reference plane.

6. The light guide plate as claimed in claim 1, wherein the total reflection curved surface has a first side edge and a second side edge, the first side edge is connected to the first surface, the second side edge is connected to the second light incident surface, the first side edge is in an arc shape protruding away from the second light incident surface, and the second side edge is in an arc shape protruding away from the first surface.

7. The light guide plate according to claim 1, wherein the plurality of convex structures are integrally connected.

8. A light source module, comprising a light guide plate and a plurality of light emitting elements, wherein:

the light guide plate is provided with a first light incident surface and a first surface, the first light incident surface is connected with the first surface, one side, adjacent to the first light incident surface, of the first surface is provided with a plurality of protruding structures, each protruding structure is provided with a second light incident surface and a total reflection curved surface, the total reflection curved surface is connected with the first surface and the second light incident surface, the total reflection curved surface is provided with a first side edge and a second side edge, the first side edge is connected with the first surface, the second side edge is connected with the second light incident surface, the first side edge is in an arc shape far away from the first surface, and the second side edge is in an; and

the plurality of light emitting elements are arranged opposite to the first light incident surface of the light guide plate and are suitable for emitting light rays which enter the light guide plate through the second light incident surface and the first light incident surface of each of the plurality of protruding structures, each of the plurality of light emitting elements is arranged between two adjacent arc tops, and a space is formed between any two adjacent light emitting elements in the plurality of light emitting elements.

9. The light source module of claim 8, wherein the light guide plate further has a second surface opposite to the first surface, the first surface is a light emitting surface, and the second surface is connected to the first light incident surface and has a plurality of microstructures.

10. The light source module of claim 8, wherein the first surface further comprises a plurality of microstructures, and the plurality of microstructures are distributed outside the plurality of protruding structures.

11. The light source module of claim 8, wherein the light emitting elements are arranged along an arrangement direction parallel to the first light incident surface, and the distances between any two adjacent light emitting elements in the light emitting elements are the same.

12. The light source module of claim 11, wherein the maximum width of the second light incident surface of each of the plurality of protrusion structures in the arrangement direction is the same as the pitch.

13. The light source module of claim 8, wherein the plurality of convex structures are arranged along an arrangement direction parallel to the first light incident surface.

14. The light source module of claim 8, wherein the second light incident surface and the first light incident surface of each of the plurality of protrusion structures are located on a same reference plane.

15. The light source module of claim 8, wherein the plurality of raised structures are integrally connected.