CN216816997U - Light guide plate and light source module - Google Patents

Abstract

The utility model provides a light guide plate which comprises a plate body, a plurality of first strip-shaped microstructures and a plurality of second strip-shaped microstructures. The first strip-shaped microstructures and the second strip-shaped microstructures are respectively arranged on the light emitting surface and the light incident surface of the plate body. The first strip-shaped microstructure is provided with a first end close to the light incident surface and a second end far away from the light incident surface. The maximum height of the first strip-shaped microstructure is gradually increased from the first end to the second end. The second strip-shaped microstructure is provided with a third end and a fourth end. The cross section of the second strip-shaped microstructure is semicircular, and the maximum height of the second strip-shaped microstructure is gradually changed from the third end to the fourth end. The adjacent second strip-shaped microstructures are connected with each other, and the length of each second strip-shaped microstructure is equal to the thickness of the plate body. The utility model also provides a light source module using the light guide plate. The light guide plate and the light source module provided by the utility model can optimize the effect of brightness uniformity.

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 an illumination light source to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide an illumination source with high luminance and high uniformity.

In the conventional side-in backlight module, a plurality of light emitting diodes are arranged at intervals beside a light guide plate, so that a plurality of bright regions corresponding to the plurality of light emitting diodes and a dark region between two light emitting diodes are generated after the emitted light enters the light guide plate, and a Hot spot (Hot spot) phenomenon with uneven brightness is formed.

The background section is only provided to aid in understanding the present disclosure, and therefore the disclosure in the background section may include some prior art that does not constitute a part of the knowledge of those skilled in the art. Furthermore, the disclosure in the "background" does not represent a material or problem to be solved by one or more embodiments of the present invention, nor is it a representation that has been known or appreciated by those skilled in the art prior to the filing of the present application.

SUMMERY OF THE UTILITY MODEL

The utility model provides a light guide plate which can improve the brightness uniformity.

The utility model provides a light source module which can improve the brightness uniformity.

Other objects and advantages of the present invention will 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 utility model provides a light guide plate including a plate body, a plurality of first strip-shaped microstructures, and a plurality of second strip-shaped microstructures. The plate body is provided with a light incident surface and a light emergent surface, and the light emergent surface is adjacent to and not parallel to the light incident surface. The plurality of first strip-shaped microstructures are arranged on the light-emitting surface. Each first strip-shaped microstructure is provided with a first end and a second end and extends along a first extending direction. The first end is close to the light incident surface, and the second end is far away from the light incident surface. The maximum height of each first strip-shaped microstructure in the direction perpendicular to the light-emitting surface is gradually increased from the first end to the second end. The plurality of second strip-shaped microstructures are arranged on the light incident surface. Each second strip-shaped microstructure is provided with a third end and a fourth end and extends along the second extending direction. The third end is close to the light-emitting surface, and the fourth end is far away from the light-emitting surface. The maximum height of each second strip-shaped microstructure in the direction perpendicular to the light incident surface is gradually changed from the third end to the fourth end. The second strip-shaped microstructure is semicircular in cross section parallel to the light-emitting surface. The adjacent second strip-shaped microstructures are connected with each other, and the length of each second strip-shaped microstructure in the direction perpendicular to the light-emitting surface is equal to the thickness of the plate body in the direction perpendicular to the light-emitting surface.

In order to achieve one or a part of or all of the above or other objects, an embodiment of the utility model provides a light source module including a plurality of light emitting elements and the light guide plate. The light-emitting elements are arranged opposite to the light incident surface of the plate body.

In the light guide plate of the embodiment of the utility model, the plurality of second strip-shaped microstructures are arranged on the light incident surface, so that light rays emitted from the plurality of light emitting elements can be dispersed before entering the light incident surface of the light guide plate, the dark space phenomenon formed between any two adjacent light emitting elements is reduced, and the effect of improving the brightness uniformity is achieved. In addition, the maximum height of each second strip-shaped microstructure in the direction perpendicular to the light incident surface is gradually changed from the third end to the fourth end, so that the light splitting effect at the lower part of the maximum height is smaller, the light splitting effect at the higher part of the maximum height is larger, light rays can be more uniformly dispersed, and a bright band is prevented from being generated on one side, close to the light incident surface, of the light guide plate. Moreover, adjacent second strip-shaped microstructures are connected without leaving blank areas, and the second strip-shaped microstructures can be arranged on the whole surface of the light incident surface, so that the effect of improving the brightness uniformity can be optimized.

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 utility model.

Fig. 2A is a schematic side view of a light source module according to an embodiment of the utility model.

Fig. 2B is a side view of a light source module according to another embodiment of the utility model.

Fig. 3A is a schematic perspective view of a second strip-shaped microstructure according to another embodiment of the utility model.

Fig. 3B is a schematic side view of a second stripe-shaped microstructure according to another embodiment of the utility model.

Fig. 4A is a schematic perspective view of a second strip-shaped microstructure according to another embodiment of the utility model.

Fig. 4B is a schematic side view of a second strip-shaped microstructure according to another embodiment of the utility model.

Fig. 5A is a schematic perspective view of a second strip-shaped microstructure according to another embodiment of the utility model.

Fig. 5B is a schematic side view of a second strip-shaped microstructure according to another embodiment of the utility model.

Fig. 6A is a schematic perspective view of a light guide plate according to another embodiment of the utility model.

Fig. 6B is a schematic side view of a light guide plate according to another embodiment of the utility model.

List of reference numerals

1: light source module

10. 10a light guide plate

20 light emitting element

100: plate body

110 incident light surface

120, light-emitting surface

200. 200' first strip-shaped microstructure

201 first end

202 the second end

210 light-emitting curved surface

300. 300a, 300b, 300c second strip microstructure

301 third end

302 fourth end

310 optical curved surface

320 first substructure

330 second substructure

A is the arrangement direction

C, connecting wire

E1 first direction of extension

E2 second direction of extension

H1, H2, H21, H22, H3 height

L is light

Le, Le1, Le2 length

T is thickness

W1, W2, W21, W22, W3 width

X, Y, Z axial direction.

Detailed Description

The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of a preferred embodiment when read in conjunction with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are directions with reference to the drawings only. 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 utility model. Fig. 2A is a schematic side view of a light source module according to an embodiment of the utility model. Referring to fig. 1 and fig. 2A, 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 includes a plate body 100, a plurality of first strip-shaped microstructures 200, and a plurality of second strip-shaped microstructures 300. The plate body 100 has an incident surface 110 and an exit surface 120, the exit surface 120 and the incident surface 110 are, for example, adjacent and not parallel, in the embodiment, the exit surface 120 is perpendicular to the incident surface 110. The plurality of first strip microstructures 200 are disposed on the light emitting surface 120. Each first bar-shaped microstructure 200 has a first end 201 and a second end 202, and both extend along the first extending direction E1. 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 110. In the present embodiment, the first extending direction E1 is a direction from the light incident surface 110 to a direction away from the light incident surface 110, and specifically, the first extending direction E1 is, for example, perpendicular to the light incident surface 110. In addition, the plurality of first strip-shaped microstructures 200 are, for example, arranged along an arrangement direction a, the arrangement direction a is not parallel to the first extending direction E1, and in the embodiment, the arrangement direction a is perpendicular to the first extending direction E1. The plurality of second strip-shaped microstructures 300 are disposed on the light incident surface 110. Each of the second stripe microstructures 300 has a third end 301 and a fourth end 302 and extends along the second extending direction E2. The third end 301 is close to the light emitting surface 120, and the fourth end 302 is far from the light emitting surface 120. In the present embodiment, the second extending direction E2 is a direction from the light emitting surface 120 to a direction away from the light emitting surface 120, and specifically, the second extending direction E2 is, for example, perpendicular to the light emitting surface 120. In addition, the plurality of second stripe-shaped microstructures 300 are, for example, also arranged along the arrangement direction a, which is also not parallel to the second extending direction E2. In fig. 1 of the present embodiment, the first extending direction E1 is, for example, parallel to the X axis, and the second extending direction E2 is, for example, parallel to the Z axis, that is, the first extending direction E1 is, for example, perpendicular to the second extending direction E2, but is not limited thereto. The arrangement direction a is, for example, parallel to the Y axis, but is not limited thereto. The number of the first strip-shaped microstructures 200 and the second strip-shaped microstructures 300 in fig. 1 is only illustrative, and the utility model is not limited to the number of the strip-shaped microstructures. The light emitting elements 20 are disposed opposite to the light incident surface 110 of the plate 100, and are adapted to emit light L to enter the light incident surface 110. Similarly, the number of the light emitting elements 20 in fig. 1 is 3 as an example, but the present invention is not particularly limited to the number of the light emitting elements 20. Hereinafter, the structural features of the first strip-shaped microstructures 200 and the second strip-shaped microstructures 300 will be described in detail.

In the present embodiment, the maximum height H1 of each first bar-shaped microstructure 200 in the direction perpendicular to the light emitting surface 120 increases gradually from the first end 201 to the second end 202. That is, the maximum height H1 of each first bar-shaped microstructure 200 at the first end 201 close to the light incident surface 110 is minimum, and the maximum height H1 of the second end 202 far away from the light incident surface 110 is maximum, for example, the maximum height H1 of each first bar-shaped microstructure 200 at the first end 201 close to the light incident surface 110 is 0 mm. Specifically, the maximum height H1 of each first stripe-shaped microstructure 200 is greater than or equal to 0 and less than 0.5mm, but not limited thereto. By the above design, the greater the maximum height H1 of each first strip-shaped microstructure 200 is, the easier the light L is to be emitted and the emergent angle is concentrated, and because the maximum height H1 is configured to be gradually increased from the light incident surface 110 to the direction away from the light incident surface 120, the light emitting effect is increased on the side away from the light incident surface 120 of the plate body 100, compared with the case that the maximum height H1 is not changed, the first strip-shaped microstructure 200 of the embodiment is not easy to generate the condition that the brightness is higher on the side of the plate body 100 close to the light incident surface 120, and the brightness is lower on the side of the plate body 100 away from the light incident surface 120, thereby improving the uniformity of the light guide plate 10 in the X axis direction. In addition, the maximum width W1 of each first strip-shaped microstructure 200 in the direction parallel to the arrangement direction a is, for example, gradually increased from the first end 201 to the second end 202. The maximum width W1 ranges, for example, but not limited to, more than 0 and less than 1 mm. Similarly, the larger the maximum width W1, the easier it is for each first stripe-shaped microstructure 200 to emit the light L and concentrate the emission angle, so the increasing of the maximum width W1 can also achieve the above-mentioned effect.

In the present embodiment, any two adjacent first stripe-shaped microstructures 200 are connected to each other, for example, but not limited thereto, and may be adjusted according to design requirements. It should be noted that, since the maximum width W1 of each first bar-shaped microstructure 200 increases from the first end 201 to the second end 202, any two adjacent first bar-shaped microstructures 200 are connected to each other only at the second end 202, and there is still some gap between any two adjacent first bar-shaped microstructures 200 due to the smaller maximum width W1 at the first end 201, which also helps to increase the light extraction effect more on the side away from the light incident surface 120 of the board body 100, so as to further improve the above effect.

In addition, the length Le1 of each first strip-shaped microstructure 200 in the first extending direction E1 is, for example, smaller than the length Le of the plate body 100 in the direction perpendicular to the light incident surface 110, and the range of the length Le1 is greater than 0 and less than or equal to 500 mm. In other words, the light emitting surface 120 has a region (e.g., a rectangular region having a width equal to that of the light emitting surface 120, for example) where the first strip-shaped microstructures 200 are not disposed, and in the present embodiment, the region is adjacent to the light incident surface 110 (not shown in fig. 1). With this design, the light L can be prevented from being emitted from the light emitting surface 120 at a side close to the light incident surface 110 in advance, and the brightness of the light L is prevented from being too high. In another embodiment, the maximum height H1 and the maximum width W1 of each first bar-shaped microstructure 200 may be maintained to be the same from the first end 201 to the second end 202, so as to match the region of the light-emitting surface 120 without the first bar-shaped microstructures 200, which can achieve the effect of reducing the light L from being emitted earlier from the side of the light-emitting surface 120 close to the light-incident surface 110. Specifically, the length Le1 of the first stripe-shaped microstructures 200 is greater than 0 and less than 500mm, but not limited thereto. When the light source module 1 of the present embodiment is used in a display device, the area where the first strip-shaped microstructures 200 are not disposed is preferably not overlapped with the display area of the display panel. In another embodiment, referring to fig. 2B, the plurality of first bar-shaped microstructures 200 'disposed on the light-emitting surface have gradually increasing maximum heights, and the light-emitting surface may not have a region without the first bar-shaped microstructures 200', that is, the length of each first bar-shaped microstructure 200 'is, for example, the same as the length of the board body 100, and the plurality of first bar-shaped microstructures 200' are disposed on the entire surface of the light-emitting surface. Particularly, when the light-emitting surface does not have a region where the first strip-shaped microstructure 200' is not disposed, if a common light-splitting microstructure is used on the light-entering surface, an obvious bright dark fringe is generated, and the second strip-shaped microstructure 300 of the present invention can avoid the above situation. Hereinafter, the structural features of the plurality of second stripe-shaped microstructures 300 will be described in detail.

In the present embodiment, the cross-sectional shape of the first strip-shaped microstructures 200 parallel to the light incident surface 110 is, for example, a semicircle, but is not limited thereto. In other embodiments, the cross-sectional shapes of the first stripe-shaped microstructures 200 further include a triangle and a trapezoid, for example. Taking the cross-sectional shape of the plurality of first bar-shaped microstructures 200 as an example, each of the first bar-shaped microstructures 200 has, for example, a light-emitting curved surface 210, and the curvature radius of the light-emitting curved surface 210 perpendicular to the first extending direction E1 is, for example, the same from the first end 201 to the second end 202, but is not limited thereto. Under the condition of the same curvature radius, the process of manufacturing the plurality of first strip-shaped microstructures 200 does not need to design a change of the curvature radius additionally, so that the cost in manufacturing can be saved. Specifically, the curvature radius of the curved light exit surface 210 is, for example, 0.02mm to 0.2 mm. In particular, in the present invention, the semicircular shape of the cross section means that the arc line of the cross section is a portion of the semicircular shape (i.e., minor arc), and the radius of curvature of the arc line is constant. Compared with the embodiment that the curvature radius of the arc line with the common cross section is different, the curvature radius of the arc line is kept unchanged, so that the manufacturing cost can be saved, the light splitting effect at the lower part of the height can be reduced, the brightness drop caused by the height change can be reduced, and the brightness uniformity of the light emitting surface 120 can be further improved. However, the present invention is not limited thereto, and in other embodiments, the cross-sectional shape of the semi-circle may refer to an arc of the cross-section, such as a portion of an ellipse, or an arc-like shape composed of a plurality of straight line segments (e.g. more than 5 straight line segments), without particularly considering the brightness difference.

In the present embodiment, the maximum height H2 of each second bar-shaped microstructure 300 in the direction perpendicular to the light incident surface 110 gradually changes from the third end 301 to the fourth end 302. Taking the present embodiment as an example, the maximum height H2 of each second stripe microstructure 300 is gradually increased from the third end 301 to the fourth end 302. That is, the maximum height H2 of each second bar-shaped microstructure 300 at the third end 301 close to the light emitting surface 120 is the smallest, and the maximum height H2 at the fourth end 302 far from the light emitting surface 120 is the largest. Specifically, the maximum height H2 of each second bar-shaped microstructure 300 is greater than or equal to 0 and less than 0.1mm, but not limited thereto, in the embodiment, the maximum height H2 of each second bar-shaped microstructure 300 at the third end 301 close to the light emitting surface 120 is 0 mm. Compared to the design that the maximum height H2 is constant from the third end 301 to the fourth end 302, the light splitting effect of the second strip-shaped microstructure 300 of the present embodiment is smaller at the lower part (the third end 301) of the maximum height H2, and is larger at the higher part (the fourth end 302) of the maximum height H2, so that the light L can be more uniformly dispersed, and the generation of a bright band or a bright and dark stripe at the side of the light guide plate 10 close to the light incident surface 110 due to the too strong light condensing effect can be avoided. In addition, the maximum width W2 of each second stripe-shaped microstructure 300 in the direction parallel to the arrangement direction a is, for example, gradually increased from the third end 301 to the fourth end 302. The maximum width W2 is greater than 0 and less than 0.2mm, but is not limited thereto. Similarly, the maximum width W2 of each second stripe microstructure 300 increases from the third end 301 to the fourth end 302, so that the light L is more uniformly dispersed, and the above-mentioned effects can be achieved.

In the present embodiment, any two adjacent second stripe-shaped microstructures 300 are connected to each other, for example, so that the light splitting effect of the second stripe-shaped microstructures 300 at the fourth end 302 can be maintained, and generation of bright bands or bright dark stripes can be further avoided. Moreover, since there is no blank space left when the second bar-shaped microstructures 300 are connected to each other, that is, the second bar-shaped microstructures 300 can be disposed on the entire surface of the light incident surface 110, so as to optimize the effect of improving the brightness uniformity. It should be noted that, since the maximum width W2 of each second bar-shaped microstructure 300 increases from the third end 301 to the fourth end 302, any two adjacent second bar-shaped microstructures 300 are connected to each other only at the fourth end 302, and there is still some gap between any two adjacent second bar-shaped microstructures 300 at the third end 301 due to the smaller maximum width W2. In another embodiment, the light incident surface 110 may also have a blank region without the second strip-shaped microstructures 300, for example, the blank region corresponds to a region between adjacent light emitting elements 20.

In addition, the length Le2 of each of the second bar-shaped microstructures 300 in the direction perpendicular to the light emitting surface 120 is, for example, equal to the thickness T of the board body 100 in the direction perpendicular to the light emitting surface 120. That is, as described above, the plurality of second bar-shaped microstructures 300 are disposed on the entire surface of the light incident surface 110. However, the present invention is not limited to the above configuration, and in another embodiment, the length Le2 of the second stripe-shaped microstructure 300 may be smaller than the thickness T of the board body 100, but the light splitting effect is poor. Since the maximum height H2 and the maximum width W2 of each second bar-shaped microstructure 300 are both smaller than the maximum height H1 and the maximum width W1 of each first bar-shaped microstructure 200, and the plurality of second bar-shaped microstructures 300 are disposed on the entire surface of the light incident surface 110, in the embodiment, the number of the plurality of second bar-shaped microstructures 300 is, for example, more than 2 times of the number of the plurality of first bar-shaped microstructures 200, specifically, the number of the plurality of second bar-shaped microstructures 300 is not an integral multiple of the number of the plurality of first bar-shaped microstructures 200, so that a regular bright and dark streak (moir é pattern) can be avoided. When the number of the second bar-shaped microstructures 300 is larger, the density of the second bar-shaped microstructures 300 on the light incident surface 110 is higher, and even if there is a slight gap between any two adjacent second bar-shaped microstructures 300 due to the gradual change of the structure, the probability that the light L directly passes through the gap and is not dispersed by the second bar-shaped microstructures 300 can be reduced.

In the present embodiment, the cross-sectional shapes of the plurality of second stripe microstructures 300 parallel to the light emitting surface 120 are semicircular. Each of the second bar-shaped microstructures 300 has an optical curved surface 310, and the radius of curvature of the optical curved surface 310 perpendicular to the second extending direction E2 is the same from the third end 301 to the fourth end 302. Similar to the first strip-shaped microstructures 200, under the condition of the same curvature radius, the variation of the curvature radius does not need to be designed in the process of manufacturing the plurality of second strip-shaped microstructures 300, so that the manufacturing cost can be saved. Specifically, the radius of curvature of the optically curved surface 310 is, for example, 0.02mm to 0.2 mm.

The optical curved surface 310 faces away from the light incident surface 110, and a connection line C is formed at a highest point of each cross section of the optical curved surface 310 parallel to the light emitting surface 120 and along the second extending direction E2. An included angle θ is formed between the connection line C and the light incident surface 110, as shown in fig. 2A. The angle range of the angle θ is, for example, more than 0 ° and less than 20 °, but is not limited thereto. When the included angle θ is larger, the maximum height H2 and the maximum width W2 of the second bar-shaped microstructures 300 are also larger, thereby increasing the effect of dispersing the light L. According to different design requirements, the included angle theta can be adjusted, so that the light splitting effect can be maintained to be optimized.

In the present embodiment, the light emitting elements 20 are, for example, Light Emitting Diodes (LEDs), but are not limited thereto. The light emitting elements 20 can also be other kinds of light source assemblies, such as a lamp tube, and the utility model is not limited to the kind of light source.

Fig. 3A is a schematic perspective view of a second strip microstructure according to another embodiment of the utility model. Fig. 3B is a schematic side view of a second stripe-shaped microstructure according to another embodiment of the utility model. Referring to fig. 3A and 3B, the second bar-shaped microstructure 300a of the present embodiment has a structure and advantages similar to those of the second bar-shaped microstructure 300 described above, except that the maximum height H2 and the maximum width W2 of each second bar-shaped microstructure 300a of the present embodiment gradually decrease from the third end 301 to the fourth end 302. That is, the maximum height H2 and the maximum width W2 of each second stripe-shaped microstructure 300a at the third end 301 are the largest, and the maximum height H2 and the maximum width W2 at the fourth end 302 are the smallest. Since the maximum height H2 and the maximum width W2 of each second stripe-shaped microstructure 300a also have a higher portion (wider portion) and a lower portion (narrower portion), light can be more uniformly dispersed.

Fig. 4A is a schematic perspective view of a second strip-shaped microstructure according to another embodiment of the utility model. Fig. 4B is a schematic side view of a second strip-shaped microstructure according to another embodiment of the utility model. Referring to fig. 4A and fig. 4B, the second bar-shaped microstructure 300B of the present embodiment has a similar structure and advantages to the second bar-shaped microstructure 300 described above, but the difference is that the maximum height H2 and the maximum width W2 of each second bar-shaped microstructure 300B of the present embodiment gradually increase from the third end 301 to the fourth end 302. That is, the maximum height H2 and the maximum width W2 of each second stripe-shaped microstructure 300b at the middle of the whole structure are the largest, and the maximum height H2 and the maximum width W2 at the third end 301 and the fourth end 302 are the smallest. Since the maximum height H2 and the maximum width W2 of each second stripe-shaped microstructure 300a also have a higher portion (wider portion) and a lower portion (narrower portion), light can be more uniformly dispersed. In the embodiment, since the maximum height H2 and the maximum width W2 of each second bar-shaped microstructure 300b in the middle of the whole structure are the maximum, a larger light splitting effect can be achieved in the middle region corresponding to the light incident surface 110, and a smaller light splitting effect can be achieved near the light emitting surface 120, so that on one hand, light is effectively dispersed, and on the other hand, bright and dark stripes can be prevented from being generated, which is more beneficial to the uniformity of the light emitted from the light emitting surface 120.

Fig. 5A is a schematic perspective view of a second strip-shaped microstructure according to another embodiment of the utility model. Fig. 5B is a schematic side view of a second strip-shaped microstructure according to another embodiment of the utility model. Referring to fig. 5A and 5B, the second strip-shaped microstructure 300c of the present embodiment has a similar structure and advantages to the second strip-shaped microstructure 300 described above, and only the major differences of the structure will be described below. The second strip-shaped microstructure 300c of the present embodiment includes a plurality of first sub-structures 320 and a plurality of second sub-structures 330. The plurality of first sub-structures 320 and the plurality of second sub-structures 330 extend along the second extending direction E2, for example, and are alternately arranged along the arrangement direction a. The maximum height H21 and the maximum width W21 of each first substructure 320 increase from the third end 301 toward the fourth end 302, and the maximum height H22 and the maximum width W22 of each second substructure 330 decrease from the third end 301 toward the fourth end 302. Similar to the second bar-shaped microstructures 300, 300a, 300b, since the maximum height H21 and the maximum width W21 of the first substructure 320 and the maximum height H22 and the maximum width W22 of the second substructure 330 in the second bar-shaped microstructure 300c also have a higher portion (wider portion) and a lower portion (narrower portion), light can be more uniformly dispersed.

Fig. 6A is a schematic perspective view of a light guide plate according to another embodiment of the utility model. Fig. 6B is a schematic side view of a light guide plate according to another embodiment of the utility model. Referring to fig. 6A and 6B, the light guide plate 10a of the present embodiment has a similar structure and advantages to the light guide plate 10 described above, and only the major differences of the structure will be described below. The light guide plate 10a of the present embodiment further includes a plurality of third strip microstructures 400 disposed on the light incident surface 110. The maximum height H3 of each of the third bar-shaped microstructures 400 in the direction perpendicular to the light incident surface 110 and the maximum width W3 of each of the third bar-shaped microstructures 400 in the direction parallel to the arrangement direction a are constant from the end close to the light emitting surface 120 to the end far from the light emitting surface 120. In the present embodiment, the maximum height H3 and the maximum width W3 of each third bar-shaped microstructure 400 are respectively the same as the maximum height H2 and the maximum width W2 of the plurality of second bar-shaped microstructures 300 farthest from the light emitting surface 120 (fourth end 302), so that the light splitting effect of the bar-shaped microstructures integrally disposed on the light incident surface 110 can be further improved. The cross-sectional shape of the third bar-shaped microstructure 400 in fig. 6A parallel to the light emitting surface 120 is a semicircle, but not limited thereto, and the cross-sectional shape in other embodiments may be a triangle, a trapezoid, or any polygon. In addition, the third strip-shaped microstructures 400 extend along the second extending direction E2, for example, and are alternately arranged with the second strip-shaped microstructures 300 along the arrangement direction a. In the present embodiment, the adjacent second bar-shaped microstructures 300 and the third bar-shaped microstructures 400 are connected to each other, for example, that is, any two adjacent second bar-shaped microstructures 300 are connected to each other through the third bar-shaped microstructures 400, for example. In the light guide plate 10a of the present embodiment, the second strip-shaped microstructures 300 are matched with the third strip-shaped microstructures 400, but not limited thereto, and the second strip-shaped microstructures 300a, 300b, and 300c may be selected according to different design requirements or different optical effect requirements.

In summary, in the light guide plate according to the embodiments of the utility model, the second strip-shaped microstructures are disposed on the light incident surface, so that light emitted from the light emitting elements can be dispersed before entering the light incident surface of the light guide plate, and a dark area phenomenon formed between any two adjacent light emitting elements is reduced, thereby achieving an effect of improving brightness uniformity. In addition, the maximum height of each second strip-shaped microstructure in the direction perpendicular to the light incident surface is gradually changed from the third end to the fourth end, so that the light splitting effect at the lower part of the maximum height is smaller, the light splitting effect at the higher part of the maximum height is larger, light rays can be more uniformly dispersed, and a bright band is prevented from being generated on one side, close to the light incident surface, of the light guide plate. Moreover, the adjacent second strip-shaped microstructures are connected without a blank area, and the second strip-shaped microstructures can be arranged on the whole surface of the light incident surface, so that the effect of improving the brightness uniformity can be optimized.

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 content 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 utility model to achieve all of the objects or advantages or features disclosed herein. Furthermore, the abstract and the title of the specification are provided to assist 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 or the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Claims (14)

1. A light guide plate is characterized by comprising a plate body, a plurality of first strip-shaped microstructures and a plurality of second strip-shaped microstructures, wherein the first strip-shaped microstructures and the second strip-shaped microstructures are arranged on the plate body

The plate body is provided with a light incident surface and a light emergent surface, and the light emergent surface is adjacent to and not parallel to the light incident surface;

the plurality of first strip-shaped microstructures are arranged on the light emitting surface, each of the plurality of first strip-shaped microstructures is provided with a first end and a second end and extends along a first extending direction, the first end is close to the light incident surface, the second end is far away from the light incident surface, and the maximum height of each of the plurality of first strip-shaped microstructures in the direction perpendicular to the light emitting surface is gradually increased from the first end to the second end; and

the plurality of second strip-shaped microstructures are arranged on the light incident surface, each of the plurality of second strip-shaped microstructures is provided with a third end and a fourth end and extends along a second extending direction, the third end is close to the light emergent surface, the fourth end is far away from the light emergent surface, the maximum height of each of the plurality of second strip-shaped microstructures in the direction perpendicular to the light incident surface is gradually changed from the third end to the fourth end, the cross section of each of the plurality of second strip-shaped microstructures in the direction parallel to the light emergent surface is semicircular, the plurality of second strip-shaped microstructures are adjacent to each other, and the length of each of the plurality of second strip-shaped microstructures in the direction perpendicular to the light emergent surface is equal to the thickness of the plate body in the direction perpendicular to the light emergent surface.

2. The light guide plate according to claim 1, wherein each of the first plurality of bar-shaped microstructures has a light-emitting curved surface, a radius of curvature of the light-emitting curved surface perpendicular to the first extending direction is the same from the first end to the second end, and each of the second plurality of bar-shaped microstructures has an optical curved surface, a radius of curvature of the optical curved surface perpendicular to the second extending direction is the same from the third end to the fourth end.

3. The light guide plate according to claim 2, wherein the curved light exit surface has a radius of curvature of 0.02mm to 0.2mm, and the curved optical surface has a radius of curvature of 0.02mm to 0.2 mm.

4. The light guide plate of claim 1, wherein the first strip-shaped microstructures have a cross-sectional shape parallel to the light incident surface, the cross-sectional shape including a semicircle, a triangle, and a trapezoid.

5. The light guide plate according to claim 1, wherein the maximum height of each of the plurality of second stripe-shaped microstructures is gradually increased, decreased or increased and then decreased from the third end to the fourth end.

6. The light guide plate according to claim 1, wherein the plurality of second stripe-shaped microstructures comprises a plurality of first sub-structures and a plurality of second sub-structures, the plurality of first sub-structures and the plurality of second sub-structures extend along the second extending direction and are alternately arranged along an arrangement direction, the arrangement direction is not parallel to the second extending direction, a maximum height of each of the plurality of first sub-structures increases from the third end toward the fourth end, and a maximum height of each of the plurality of second sub-structures decreases from the third end toward the fourth end.

7. The light guide plate according to claim 1, further comprising a plurality of third strip-shaped microstructures disposed on the light incident surface, wherein a maximum height of each of the third strip-shaped microstructures in a direction perpendicular to the light incident surface is constant, the third strip-shaped microstructures extend along the second extending direction and are alternately arranged with the second strip-shaped microstructures along an arrangement direction, and the arrangement direction is not parallel to the second extending direction.

8. The light guide plate according to claim 1, wherein the first strip-shaped microstructures are connected to each other.

9. The light guide plate according to claim 1, wherein a length of each of the first strip-shaped microstructures in the first extending direction is smaller than a length of the plate body in a direction perpendicular to the light incident surface, and the length of each of the first strip-shaped microstructures is greater than 0 and less than 500 mm.

10. The light guide plate according to claim 1, wherein each of the second bar-shaped microstructures further has an optical curved surface facing away from the light incident surface and having a connecting line, an included angle is formed between the connecting line and the light incident surface, the included angle has an angle range greater than 0 ° and less than 20 °, and the highest point of the optical curved surface on each cross section parallel to the light emitting surface and along the second extending direction forms the connecting line.

11. The light guide plate according to claim 1, wherein a maximum height of each of the first strip-shaped microstructures is greater than 0 and less than 0.5mm, and a maximum height of each of the second strip-shaped microstructures is greater than or equal to 0 and less than 0.1 mm.

12. The light guide plate according to claim 1, wherein the first strip-shaped microstructures are arranged along an arrangement direction, a maximum width of each of the first strip-shaped microstructures parallel to the arrangement direction is greater than 0 and less than 1mm, the second strip-shaped microstructures are arranged along the arrangement direction, and a maximum width of each of the second strip-shaped microstructures parallel to the arrangement direction is greater than or equal to 0 and less than 0.2 mm.

13. The light guide plate according to claim 1, wherein the number of the second strip-shaped microstructures is more than 2 times the number of the first strip-shaped microstructures.

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

the light guide plate comprises a plate body, a plurality of first strip-shaped microstructures and a plurality of second strip-shaped microstructures, wherein,

the plate body is provided with a light incident surface and a light emergent surface, and the light emergent surface is adjacent to and not parallel to the light incident surface;

the plurality of first strip-shaped microstructures are arranged on the light emitting surface, each of the plurality of first strip-shaped microstructures is provided with a first end and a second end and extends along a first extending direction, the first end is close to the light incident surface, the second end is far away from the light incident surface, and the maximum height of each of the plurality of first strip-shaped microstructures in the direction perpendicular to the light emitting surface is gradually increased from the first end to the second end; and

the plurality of second strip-shaped microstructures are arranged on the light incident surface, each of the plurality of second strip-shaped microstructures is provided with a third end and a fourth end and extends along a second extending direction, the third end is close to the light emergent surface, the fourth end is far away from the light emergent surface, the maximum height of each of the plurality of second strip-shaped microstructures in the direction perpendicular to the light incident surface is gradually changed from the third end to the fourth end, the cross section of each of the plurality of second strip-shaped microstructures in the direction parallel to the light emergent surface is semicircular, the plurality of second strip-shaped microstructures are adjacent to each other, and the length of each of the plurality of second strip-shaped microstructures in the direction perpendicular to the light emergent surface is equal to the thickness of the plate body in the direction perpendicular to the light emergent surface; and

the light-emitting elements are arranged opposite to the light incident surface of the plate body.

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