CN105388556A - Light guide plate and light source module - Google Patents

Abstract

The invention discloses a light guide plate and a light source module. The light guide plate comprises a main body, a plurality of first stripe microstructures and a plurality of second stripe microstructures. The main body comprises a light incident surface, a light emergent surface and a reflecting surface, wherein the light emergent surface is opposite to the reflecting surface, and the light incident surface is jointed between the light emergent surface and the reflecting surface. The light-emitting surface comprises a first microstructure area and a second microstructure area which are sequentially arranged, and the first microstructure area is adjacent to the light-emitting surface compared with the second microstructure area. The first stripe microstructure is arranged in the first microstructure area and extends along the direction from one side of the main body adjacent to the light incident surface to the other side of the main body far away from the light incident surface. The second striated microstructures are arranged in the second microstructure area along the direction, wherein the gradient of each second striated microstructure gradually changes along the direction.

Description

Light guide plate and light source module

technical field

The invention relates to a light guide assembly, in particular to a light guide plate and a backlight module.

Background technique

With the rapid development of point light sources such as light-emitting diodes (LEDs), the light source type of the backlight module has gradually changed from line light sources to point light sources, such as changing from traditional linear cold-cathode tubes to point light-emitting diodes. Referring to FIG. 1 and FIG. 2 , they are respectively a top view showing an arrangement of a light guide plate and light emitting diodes of a conventional backlight module, and a side view of the backlight module. The backlight module 100 mainly includes a light guide plate 102 , several LEDs 108 and a shield 112 .

In the backlight module 100 , the LED 108 is disposed beside the light incident surface 106 of the light guide plate 102 and emits light 110 toward the light incident surface 106 of the light guide plate 102 . The shield 112 covers the LED 108 and part of the light-emitting surface 104 on the light-incident side of the light guide plate 102 , that is, covers the non-visible area 118 of the light-emitting surface 104 . The light 110 emitted by the LED 108 enters the light guide plate 102 through the light incident surface 106 , and after being guided by the light guide plate 102 , exits the light guide plate 102 from the light exit surface 104 of the light guide plate 102 .

Referring to FIG. 3 , it is a side view showing another conventional backlight module. The structure of the backlight module 100 a is substantially the same as that of the above-mentioned backlight module 100 , the difference between the two is that the light guide plate 102 a of the backlight module 100 a includes a tapered portion 120 and a flat portion 122 . The thickness of the tapered portion 120 gradually decreases from the light incident surface 106 toward the flat plate portion 122 . In the backlight module 100a, except for the top edge of the light incident surface 106, the distance between the light emitting surface 104a of the light guide plate 102a and the shield 112 increases.

However, as shown in FIG. 2 and FIG. 3 , if the covering area of the shield 112 is too short, it is very easy to produce an apparent light leakage phenomenon in the non-visible area 118 on the light incident side of the backlight module 100 or 100 a. However, due to the high directivity of the light emitting diodes 108 , the light leakage in the non-visible area 118 of the backlight module 100 or 100 a is quite uneven in brightness and darkness. As a result, the appearance brightness uniformity of the light-incident side of the backlight module 100 or 100 a seen by the user's eyes 114 is poor, and hot spots (HotSpots) 116 are often generated, as shown in FIG. 4 . Therefore, the appearance brightness distribution of the traditional backlight modules 100 and 100a is uneven, which seriously affects the visual quality of the backlight modules 100 and 100a.

Contents of the invention

Therefore, an object of the present invention is to provide a light guide plate and a light source module, wherein the light guide plate is provided with several stripe microstructures in the first microstructure area of the light-emitting surface adjacent to the light-incidence surface, and these stripe microstructures are adjacent to the main body. The direction extending from one side of the light incident surface to the other side of the main body away from the light incident surface. Since these first stripe microstructures can scatter the incident light in the non-visible area, the light leakage in the non-visible area can be effectively atomized, and thus the phenomenon of uneven brightness and darkness in the non-visible area can be greatly improved.

Another object of the present invention is to provide a light guide plate and a light source module, wherein the second microstructure area disposed behind the first microstructure area on the light exit surface of the light guide plate is provided with many second stripe microstructures. By changing the shape, angle, height, depth or arrangement of the second stripe microstructures, the optical trend and degree of light gathering of the light guide plate can be changed, so the brightness and brightness uniformity of the light guide plate and the light source module can be increased.

Another object of the present invention is to provide a light source module with high uniformity of light output brightness.

According to the above object of the present invention, a light guide plate is proposed. The light guide plate includes a main body, a plurality of first striped microstructures and a plurality of second striped microstructures. The main body includes a light incident surface, a light exit surface and a reflection surface, wherein the light exit surface is opposite to the reflection surface, and the light incident surface is joined between the light exit surface and the reflection surface. The light exit surface includes a first microstructure area and a second microstructure area arranged in sequence, and the first microstructure area is closer to the light incident surface than the second microstructure area. The first stripe microstructure is arranged in the first microstructure area and extends along a direction from one side of the main body adjacent to the light-incident surface to the other side of the main body away from the light-incident surface. The second striped microstructure is disposed in the second microstructure area along the aforementioned direction, wherein the gradient of each second striped microstructure changes gradually along this direction.

According to an embodiment of the present invention, the light guide plate further includes a plurality of microstructures disposed on the light incident surface.

According to an embodiment of the present invention, the cross-sectional profile of each microstructure or each first striped microstructure is V-shaped, inverted V-shaped or arc-shaped.

According to an embodiment of the present invention, each of the aforementioned microstructures is a convex portion or a concave portion.

According to an embodiment of the present invention, the light exit surface further includes a blank area between the first microstructure area and the light incident surface.

According to an embodiment of the present invention, the above-mentioned main body includes a tapered portion and a flat portion. The tapered part has a first end and a second end opposite to each other, wherein the thickness of the first end is greater than the thickness of the second end. The flat plate portion extends from the second end along the aforementioned direction, wherein the thickness of the flat plate portion is equal to the thickness of the second end.

According to an embodiment of the present invention, the above-mentioned first stripe microstructure is disposed on the flat plate portion.

According to an embodiment of the present invention, the light-emitting surface further includes a blank area between the first microstructure area and the microstructure, and the blank area is located on the tapered portion, or on the tapered portion and the flat plate portion.

According to an embodiment of the present invention, the above-mentioned first stripe microstructures are adjacent to each other.

According to an embodiment of the present invention, the above-mentioned first stripe microstructures are separated from each other.

According to an embodiment of the present invention, each of the above-mentioned first stripe microstructures is a convex portion or a concave portion.

According to an embodiment of the present invention, each of the above-mentioned second stripe microstructures is a convex portion or a concave portion.

According to an embodiment of the present invention, when each second stripe microstructure is a convex portion, the gradient of each second stripe microstructure includes the height of each second stripe microstructure, and each second stripe microstructure The height of is gradually increased from the light incident surface along the above direction. When each second striped microstructure is a depression, the gradient of each second striped microstructure includes the depth of each second striped microstructure, and the depth of each second striped microstructure is along the above-mentioned The direction gradually becomes larger.

According to an embodiment of the present invention, the gradient of each second striped microstructure further includes the width of each second striped microstructure, and the width of each second striped microstructure gradually changes from the light incident surface along the above direction. Big.

According to an embodiment of the present invention, when each second stripe microstructure is a convex portion, the gradient of each second stripe microstructure includes the height of each second stripe microstructure, and each second stripe microstructure The height gradually decreases from the light incident surface along the above direction. When each second stripe microstructure is a depression, the gradient of each second stripe microstructure includes the depth of each second stripe microstructure, and the depth of each second stripe microstructure is along the direction from the light incident surface Gradually get smaller.

According to an embodiment of the present invention, the gradient of each second striped microstructure further includes the width of each second striped microstructure, and the width of each second striped microstructure gradually changes from the light incident surface along the above direction. Small.

According to an embodiment of the present invention, the cross-sectional profile of each of the above-mentioned second striped microstructures is V-shaped, inverted V-shaped, arc-shaped or trapezoidal.

According to the above object of the present invention, a light source module is proposed, comprising the above-mentioned light guide plate and a plurality of light sources arranged adjacent to the light incident surface of the light guide plate.

According to an embodiment of the present invention, the light guide plate further includes a plurality of microstructures disposed on the light incident surface.

According to an embodiment of the present invention, each of the above-mentioned second stripe microstructures is a convex portion or a concave portion. When each second stripe microstructure is a convex portion, the gradient of each second stripe microstructure includes the height and width of each second stripe microstructure, and the height and width of each second stripe microstructure are from The glossy surface becomes gradually larger along the above-mentioned direction. When each second striped microstructure is a depression, the gradient of each second striped microstructure includes the depth and width of each second striped microstructure, and the depth and width of each second striped microstructure start from the incident light The face becomes gradually larger along the above direction.

According to an embodiment of the present invention, each of the above-mentioned second stripe microstructures is a convex portion or a concave portion. When each second stripe microstructure is a convex portion, the gradient of each second stripe microstructure includes the height and width of each second stripe microstructure, and the height and width of each second stripe microstructure are from The glossy surface becomes gradually smaller along the above direction. When each second striped microstructure is a depression, the gradient of each second striped microstructure includes the depth and width of each second striped microstructure, and the depth and width of each second striped microstructure start from the incident light The faces gradually become smaller along the above directions.

According to the above objective of the present invention, a light guide plate is proposed, which includes a main body, a plurality of first microstructures and a plurality of second microstructures. The main body includes a light incident surface and a light exit surface, wherein the light exit surface includes a first microstructure area and a second microstructure area arranged in sequence, and the first microstructure area is closer to the light incident surface than the second microstructure area. The first microstructure is disposed in the first microstructure region. The second microstructure is disposed in the second microstructure region, wherein the essential type or arrangement of the first microstructure is different from the essential type or arrangement of the second microstructure.

According to an embodiment of the present invention, the light guide plate further includes a plurality of third microstructures disposed on the light incident surface.

According to an embodiment of the present invention, the above-mentioned second microstructure area includes a plane and a non-plane, the second microstructure is located on the non-plane, and the ratio of the plane to the non-plane is from the end of the second microstructure area adjacent to the light incident surface toward the first The two microstructure regions vary away from an opposite end of the light-incident surface.

According to an embodiment of the present invention, the ratio of the above-mentioned plane to non-plane gradually decreases from the end adjacent to the light-incident surface toward the opposite end away from the light-incident surface.

According to an embodiment of the present invention, the ratio of the above-mentioned plane to non-plane gradually increases from the end adjacent to the light-incident surface toward the opposite end away from the light-incident surface.

According to the above objective of the present invention, a light guide plate is proposed, which includes a main body, a plurality of first microstructures and a plurality of second microstructures. The main body includes a light incident surface and a light exit surface, wherein the light exit surface includes a first microstructure area and a second microstructure area arranged in sequence, the first microstructure area is closer to the light incident surface than the second microstructure area, and the first microstructure area There is a blank area between the second microstructure area. The first microstructure is disposed in the first microstructure region. The second microstructure is arranged in the second microstructure area, wherein the second microstructure area includes a plane and a non-plane, the second microstructure is located on the non-plane, and the ratio of the plane to the non-plane is from the second microstructure area adjacent to the incident light One end of the face changes toward an opposite end of the second microstructure region away from the light-incident face.

According to an embodiment of the present invention, the essential type or arrangement of the first microstructure is different from the essential type or arrangement of the second microstructure.

According to an embodiment of the present invention, the light guide plate further includes a plurality of third microstructures disposed on the light incident surface.

According to an embodiment of the present invention, the ratio of the above-mentioned plane to non-plane gradually decreases from the end adjacent to the light-incident surface toward the opposite end away from the light-incident surface.

According to an embodiment of the present invention, the ratio of the above-mentioned plane to non-plane gradually increases from the end adjacent to the light-incident surface toward the opposite end away from the light-incident surface.

According to the above objective of the present invention, a light guide plate is proposed, which includes a main body, a plurality of first microstructures, a plurality of second microstructures and a plurality of third microstructures. The main body includes a light incident surface and a light exit surface, wherein the light exit surface includes a first microstructure area and a second microstructure area arranged in sequence, the first microstructure area is closer to the light incident surface than the second microstructure area, and the first microstructure area and the second microstructure area are adjacent to the light incident surface. There is a blank area between the second microstructure area, and there is another blank area between the first microstructure area and the light incident surface. The first microstructure is disposed in the first microstructure region. The second microstructure is disposed in the second microstructure region. The third microstructure is arranged on the light incident surface.

According to an embodiment of the present invention, the essential type or arrangement of the first microstructure is different from the essential type or arrangement of the second microstructure.

According to an embodiment of the present invention, the above-mentioned second microstructure area includes a plane and a non-plane, the second microstructure is located on the non-plane, and the ratio of the plane to the non-plane is from the end of the second microstructure area adjacent to the light incident surface toward the first The two microstructure regions vary away from an opposite end of the light-incident surface.

According to an embodiment of the present invention, the ratio of the above-mentioned plane to non-plane gradually decreases from the end adjacent to the light-incident surface toward the opposite end away from the light-incident surface.

According to an embodiment of the present invention, the ratio of the above-mentioned plane to non-plane gradually increases from the end adjacent to the light-incident surface toward the opposite end away from the light-incident surface.

According to an embodiment of the present invention, the above-mentioned third microstructure is continuously disposed on the light incident surface.

According to an embodiment of the present invention, the third microstructure is disposed discontinuously on the light incident surface.

According to the above object of the present invention, a light source module is proposed, comprising the above-mentioned light guide plate and a plurality of light sources arranged adjacent to the light incident surface of the light guide plate.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the accompanying drawings are described as follows:

FIG. 1 is a top view showing a device of a light guide plate and a light emitting diode of a conventional backlight module;

2 is a side view showing a conventional backlight module;

3 is a side view showing another conventional backlight module;

FIG. 4 shows an appearance luminance distribution diagram of a light-incident side of a traditional backlight module;

5 is a perspective view illustrating a light source module according to an embodiment of the present invention;

5A is a cross-sectional view obtained along the AA' section line of the light guide plate of FIG. 5 according to an embodiment of the present invention;

5B is a cross-sectional view obtained along the AA' section line of the light guide plate of FIG. 5 according to another embodiment of the present invention;

6A is a perspective view showing a light source module according to another embodiment of the present invention;

6B is a perspective view showing a light source module according to yet another embodiment of the present invention;

6C is a perspective view showing a light source module according to yet another embodiment of the present invention;

FIG. 7A is a diagram showing the appearance brightness distribution of the light-incident side of the backlight module of FIG. 3;

Fig. 7B is a diagram showing the appearance brightness distribution of the light incident side of the light source module in Fig. 6A;

8 is a graph showing the appearance brightness distribution curves of the light incident side of the backlight module of FIG. 7A and the light source module of FIG. 7B;

9 is a perspective view showing a light source module according to yet another embodiment of the present invention;

Fig. 10 is a perspective view showing a light source module according to yet another embodiment of the present invention;

Fig. 11 is a perspective view showing a light source module according to yet another embodiment of the present invention;

Fig. 11A is a perspective view showing a light source module according to yet another embodiment of the present invention;

Fig. 11B is a perspective view showing a light source module according to yet another embodiment of the present invention;

Fig. 12 is a perspective view showing a light source module according to yet another embodiment of the present invention;

13 is a perspective view showing a light source module according to yet another embodiment of the present invention;

14 is a perspective view showing a light source module according to yet another embodiment of the present invention; and

FIG. 15 is a perspective view showing a light source module according to still another embodiment of the present invention.

detailed description

Referring to FIG. 5 , it is a perspective view showing a light source module according to an embodiment of the present invention. In this embodiment, the light source module 200 may be, for example, a backlight module. The light source module 200 mainly includes a light guide plate 206 and several light sources 218 . The light guide plate 206 includes a main body 202 and several stripe microstructures 204 . In one embodiment, the body 202 may be a flat plate with a uniform thickness. The main body 202 may include a light incident surface 208 and an optical surface, wherein the optical surface may be the light output surface 210 or the reflective surface 212 . In the main body 202 , the light emitting surface 210 and the reflecting surface 212 are located on opposite sides of the main body 202 , and the light incident surface 208 is joined between the light emitting surface 210 and the reflecting surface 212 . The light incident surface 208 of the main body 202 can be a mirror surface or a surface with microstructures. In addition, the light emitting surface 210 of the main body 202 may include a microstructure region 222 , wherein the microstructure region 222 is adjacent to the light incident surface 208 .

In the light guide plate 206 , the striped microstructure 204 is disposed in the microstructure region 222 of the light emitting surface 210 of the main body 202 . In one embodiment, as shown in FIG. 5 , these striped microstructures 204 are arranged in the entire microstructure region 222 of the light emitting surface 210 . In an exemplary embodiment, the striped microstructures 204 are arranged next to each other. However, in some other embodiments, the striped microstructures 204 arranged in the microstructure region 222 do not all cover the entire microstructure region 222 . The extending direction of each stripe microstructure 204 in the microstructure region 222 is parallel to the normal of the light incident surface 208 . In one embodiment, the range of the microstructure region 222 on the light-emitting surface 210 may extend within 20 mm from the end where the light-emitting surface 210 joins the light-incident surface 208 along the normal of the light-incident surface 208 .

In some examples, the striped microstructure 204 can be, for example, a V-shaped groove structure as shown in FIG. 5A and/or an R-shaped groove structure as shown in FIG. 5B . Referring again to FIG. 5B , the central angle ψ of the stripe microstructure 204 formed by the R-shaped groove structure may range from 60 degrees to 120 degrees, for example. In addition, referring to FIG. 5A again, the opening angle θ of the stripe microstructure 204 formed by the V-shaped groove structure may range from 60 degrees to 120 degrees, for example. In a preferred embodiment, the central angle ψ of the stripe microstructure 204 formed by the R-shaped groove structure, or the opening angle of the stripe microstructure 204 formed by the V-shaped groove structure is 100 degrees.

Referring again to FIG. 5 , the light source 218 is disposed beside the light incident surface 208 of the light guide plate 206 and is adjacent to the light incident surface 208 . The light emitting surface 220 of the light source 218 preferably faces the light incident surface 208 of the light guide plate 206 , so the light source 218 can emit light toward the light incident surface 208 . In one embodiment, the light source 218 may be a point light source such as a light emitting diode. Due to the high directivity of the light output from point light sources such as light emitting diodes, and the narrow range of light output, by arranging the stripe microstructure 204 in the microstructure area 222 of the light output surface 210, the light from the light output surface 210 of the main body 202 can be dispersed. The light emitted from the microstructure area 222 . Thereby, the light leakage at the light incident side of the light guide plate 206 can be made uniform, and the brightness of the light exit surface of the light source module 200 can be further made more uniform.

In some embodiments, according to the required optical performance of the light source module 200 , the light guide plate 206 can optionally include several microstructures 214 . As shown in FIG. 5 , these microstructures 214 can be disposed on the reflective surface 212 of the main body 202 of the light guide plate 206 . The microstructure 214 can be a strip structure, such as a V-shaped groove structure and an R-shaped groove structure, or can be a tapered structure or a tapered groove.

The main body of the light guide plate of the present invention can also be a non-uniform flat plate. Referring to FIG. 6A , it is a perspective view showing a light source module according to another embodiment of the present invention. The structure of the light source module 200a in this embodiment is substantially the same as that of the light source module 200 in the above embodiment, the difference between them is that the main body 202a of the light guide plate 206a of the light source module 200a is not a flat plate with uniform thickness.

In the light source module 200 a , the main body 202 a of the light guide plate 206 a includes a tapered portion 226 and a flat portion 224 . The tapered portion 226 has a first end 228 and a second end 230 opposite to each other. Wherein, the thickness of the tapered portion 226 gradually decreases from the first end 228 to the second end 230 , that is, the thickness of the first end 228 of the tapered portion 226 is greater than the thickness of the second end 230 . In addition, the flat portion 224 extends from the second end 230 of the tapered portion 226 along the normal of the light incident surface 208 . The thickness of the flat portion 224 is the same as that of the second end 230 of the tapered portion 226 . In this embodiment, the microstructure region 222 extends on the tapered part 226 and part of the flat part 224 , and the stripe microstructure 204 a is disposed on the microstructure region 222 of the tapered part 226 and the flat part 224 .

The striped microstructure of the present invention may not cover the entire microstructure region. Referring to FIG. 6B and FIG. 6C , they are respectively perspective views showing light source modules according to yet two embodiments of the present invention. The structure of the light source modules 200b and 200c is substantially the same as that of the light source module 200a in the above embodiment, the difference between the light source modules 200b and 200c and the light source module 200a lies in: the stripe microstructure 204b of the light guide plate 206b of the light source module 200b, and The striped microstructures 204c of the light guide plate 206c of the light source module 200c are only respectively disposed on a part of the microstructure regions 222 thereof.

As shown in FIG. 6B , in the light source module 200b, the striped microstructure 204b of the light guide plate 206b only extends on the tapered portion 226 of the main body 202a where the microstructure region 222 is located. On the other hand, as shown in FIG. 6C , in the light source module 200c, the striped microstructure 204c of the light guide plate 206c only extends on the flat plate portion 224 of the main body 202a where the microstructure region 222 is located.

In the present invention, the microstructure area of the light-emitting surface of the main body of the light guide plate can be divided into multiple regions, and these regions can be provided with striped microstructures of different structural shapes, such as R-shaped groove structure and V-shaped groove structure. Alternatively, these regions of the microstructure region may be provided with striped microstructures having the same structure shape but with different central or cut angles. Certainly, the microstructure area of the light-emitting surface of the main body of the light guide plate can be provided with stripe microstructures having the same structural shape and the same central angle or cutting angle.

Referring to Fig. 7A, Fig. 7B and Fig. 8, they are the appearance luminance distribution diagram of the light incident side of the backlight module of Fig. 3, the appearance luminance distribution diagram of the light incident side of the light source module of Fig. 6A, and the backlight of Fig. 7A respectively. The appearance brightness distribution curve of the module and the light incident side of the light source module in FIG. 7B . According to FIG. 7A , the non-visible area 118 on the light-incident side of the conventional backlight module 100 a has serious unevenness in brightness and darkness, and there are bright spots 116 a. However, according to FIG. 7B, it can be seen that by setting several striped microstructures 204a parallel to the normal line of the light incident surface 208 in the microstructure area 222 of the light exit surface 210 of the light guide plate 206a, the light incident in the non-visible area can be Break up, and can effectively atomize the light leakage in the non-visible area. Therefore, the uniformity of the brightness distribution of the microstructure region 222 of the light source module 200a is significantly higher than that of the conventional backlight module 100a.

In addition, as shown in FIG. 8, according to the luminance distribution curves of the backlight module 100a and the light source module 200a obtained along the measurement line 236 in FIG. 7A and FIG. The luminance distribution curve 240 of 100a has relatively high and low fluctuations. It can also be seen from this that the luminance distribution of the microstructure region 222 of the light source module 200a is more uniform than that of the conventional backlight module 100a.

Referring to FIG. 9 , FIG. 9 is a perspective view illustrating a light source module according to yet another embodiment of the present invention. The structure of the light source module 200d in this embodiment is substantially the same as that of the light source module 200 in the above-mentioned embodiment. The difference between the two structures is that: the main body 202b of the light guide plate 206d of the light source module 200d includes a plurality of point microstructures 204d, Instead of the stripe microstructure 204 ; the microstructure region 222 of the light-emitting surface 210 of the main body 202 b is separated from the light-incoming surface 208 by a distance 232 ; and the light source module 200 d further includes a shield 216 .

In the light source module 200d, the main body 202b includes a first side 242 and a second side 244 opposite to each other. The first side 242 , the light-incident surface 208 and the second side 244 are sequentially connected to three adjacent sides of the light-emitting surface 210 , that is, the light-incident surface 208 is located between the first side 242 and the second side 244 . In addition, the first side surface 242 , the light-incident surface 208 and the second side surface 244 are all joined between the light-emitting surface 210 and the reflection surface 212 .

In the main body 202 b , the microstructure region 222 extends from one side where the light-emitting surface 210 is joined with the first side 242 to the other side where the light-emitting surface 210 is joined with the second side 244 . In an exemplary example, the direction 234 extending from the first side 242 to the second side 244 of the microstructure region 222 on the light emitting surface 210 may be perpendicular to the normal of the light incident surface 208 . In addition, in an example, the distance 232 between the microstructure region 222 and the light incident surface 208 may be, for example, greater than 0 and equal to or less than 20 mm.

In the light guide plate 206d, the dot-like microstructures 204d are evenly distributed in the entire microstructure region 222 of the light-emitting surface 210 . In addition, the dot-like microstructure 204d can be a dot-like diffusion structure and a dot-like cone structure with a diffuse surface. In some exemplary examples, the dot microstructure 204d may be a sandblasting dot structure or a laser dot structure formed by sandblasting or laser.

As shown in FIG. 9, the shield 216 can extend from above the light source 218 to above the light-emitting surface 210 of the main body 202b of the light guide plate 206d, and can at least cover the light-emitting surface 220 of the light source 218, the light-incoming surface 208 of the main body 202b, and a portion of the light-emitting surface 210 adjacent to the light-incident surface 208 . In an exemplary example, the mask 216 may cover a portion of the microstructure region 222 . The shield 216 may have reflection capability, and the light emitted by the light source 218 toward the shield 216 may be reflected to the light-emitting surface 210 of the main body 202b.

For example, the emitted light of a point light source such as a light-emitting diode is highly directional, and by distributing the point-like microstructures 204d in the entire microstructure region 222 of the light-emitting surface 210 of the main body 202b, the shield 216 can be reflected toward the light-emitting surface 210 light scattering. Therefore, the point microstructure 204d can effectively atomize the spray phenomenon caused by the point light source with high directivity. Therefore, the brightness of the light-incident side of the light guide plate 206d can be uniformized, and the brightness of the light-emitting surface of the light source module 200d can be further uniformed.

Referring to FIG. 10 , FIG. 10 is a perspective view illustrating a light source module according to yet another embodiment of the present invention. The structure of the light source module 200e in this embodiment is substantially the same as that of the light source module 200d in the above embodiment. The difference between the two structures is that the main body 202a of the light guide plate 206e of the light source module 200e is not a flat plate with uniform thickness.

In the light source module 200 e , the light guide plate 206 e is similar to the light guide plate 206 a shown in FIG. 6A , and includes a tapered portion 226 and a flat portion 224 . The tapered portion 226 has a first end 228 and a second end 230 opposite to each other. The thickness of the tapered portion 226 gradually decreases from the first end 228 to the second end 230 , that is, the thickness of the first end 228 of the tapered portion 226 is greater than the thickness of the second end 230 . In addition, the flat portion 224 extends from the second end 230 of the tapered portion 226 along the normal of the light incident surface 208 . The thickness of the flat portion 224 is the same as that of the second end 230 of the tapered portion 226 . In this embodiment, the microstructure region 222 is located on the flat portion 224 and does not extend to the tapered portion 226 .

FIG. 11 is a perspective view showing a light source module according to still another embodiment of the present invention. As shown in FIG. 11 , the light source module 300 a mainly includes a light guide plate 302 a and a plurality of light sources 304 . The light guide plate 302a includes a main body 308a, a plurality of first striped microstructures 310a and a plurality of second striped microstructures 312a. The essential type or arrangement of the first stripe microstructure 310a may be different from that of the second stripe microstructure 312a. The main body 308a may include a light incident surface 318 , a light output surface 320 and a reflective surface 322 . In the main body 308 a , the light emitting surface 320 and the reflecting surface 322 are located on opposite sides of the main body 308 a , and the light incident surface 318 is joined between the light emitting surface 320 and the reflecting surface 322 . The light incident surface 318 of the main body 308a can be a mirror surface or a surface with microstructures 332a. In addition, the light-emitting surface 320 of the main body 308a may include a first microstructure region 324 and a second microstructure region 326 . The first microstructure region 324 and the second microstructure region 326 are arranged sequentially, wherein the first microstructure region 324 is closer to the light incident surface 318 than the second microstructure region 326 .

In the light guide plate 302a, the first striped microstructure 310a is disposed in the first microstructure region 324 of the light emitting surface 320 . The first stripe microstructure 310 a extends along a direction 328 , and the direction 328 is from one side of the body 308 a adjacent to the light-incident surface 318 to the other side of the body 308 a away from the light-incident surface 318 . In some exemplary examples, the extending direction of each first striped microstructure 310 a is parallel to the normal of the light-incident surface 318 . In some examples, the first striped microstructures 310a are arranged continuously, that is, the first striped microstructures 310a are adjacent to each other. In a specific example, as shown in FIG. 11A , in the main body 308a' of the light guide plate 302a' of the light source module 300a', a plurality of first striped microstructures 310a' are discontinuously arranged, that is, the first striped microstructures 310a' are separated from each other. .

Each first stripe microstructure 310a can be a convex portion or a concave portion. In an exemplary example, as shown in FIG. 11 , each first striped microstructure 310a is a depression. In some examples, each first stripe microstructure 310a is a V-shaped groove structure and an R-shaped groove structure, that is, the cross-sectional profile of each first stripe microstructure 310a is V-shaped, inverted V-shaped or arc-shaped.

By arranging the first striped microstructure 310 a in the first microstructure region 324 of the light emitting surface 320 of the light guide plate 302 a , the light leakage on the non-visible region adjacent to the light incident surface 318 can be improved.

In the light guide plate 302a, the second striped microstructure 312a is disposed in the second microstructure region 326 of the light emitting surface 320 . The second striped microstructure 312 a also extends along the direction 328 . In some examples, the second striped microstructures 312a are arranged continuously, that is, the second striped microstructures 312a are adjacent to each other. In a specific example, the second striped microstructures 312a are disposed discontinuously, that is, the second striped microstructures 312a are separated from each other, like the second striped microstructures 312b shown in FIG. 12 . In some examples, every two adjacent second stripe microstructures 312a can have equal or unequal distances, and the second stripes can be changed by adjusting the distance between every two adjacent second stripe microstructures 312a The arrangement density of the microstructures 312a can therefore increase the light guiding function of the light guide plate 302a.

Each second stripe microstructure 312a can be a convex portion or a concave portion. In an exemplary example, as shown in FIG. 11 , each second stripe microstructure 312a is a convex portion. In some examples, each second stripe microstructure 312a is V-shaped, inverted V-shaped, R-shaped or trapezoidal. For example, as shown in FIG. 11 , each second stripe microstructure 312a is trapezoidal.

In addition, the gradient of each second striped microstructure 312 a gradually changes along the direction 328 . As shown in FIG. 11 , in the example where the second striped microstructure 312a is a convex structure, the gradient of each second striped microstructure 312a can be a height H or a width W. As shown in FIG. In a specific example, the gradient of each second striped microstructure 312a may include a height H and a width W. However, in the example where the second micro-stripe structure 312a is a concave structure, the gradient of each second micro-stripe structure 312a can be depth or width. In a specific example, the gradient of each second stripe microstructure 312a may include depth and width. In an exemplary example, as shown in FIG. 11 , each second stripe microstructure 312a is a convex portion, the gradient of each second stripe microstructure 312a includes a height H and a width W, and each second stripe microstructure The height H and width W of 312 a gradually increase from the light incident surface 318 along the direction 328 . In some examples, each second stripe microstructure 312a is a convex portion, the gradient of each second stripe microstructure 312a includes a height H, and the height H of each second stripe microstructure 312a is along the light incident surface 318 The direction 328 becomes larger gradually, and the width W of each second stripe microstructure 312a is fixed. In a specific example, each second striped microstructure 312a is a convex portion, the gradient of each second striped microstructure 312a includes a width W, and the width W of each second striped microstructure 312a extends from the light incident surface 318 along the The direction 328 becomes larger gradually, and the height H of each second stripe microstructure 312a is fixed.

Referring to FIG. 11 again, the second microstructure region 326 includes a plane 326a and a non-plane 326b, wherein the second striped microstructure 312a is located on the non-planar 326b, and the region without the second striped microstructure 312a is the plane 326a. In the second microstructure region 326, the ratio of the plane 326a to the non-plane 326b varies from an end of the second microstructure region 326 adjacent to the light incident surface 318 toward an opposite end of the second microstructure region 326 away from the light incident surface 318 . In the second microstructure region 326 of the example of FIG. 11 , the ratio of the plane 326a to the non-plane 326b is from one end of the second microstructure region 326 adjacent to the light incident surface 318 toward the second microstructure region 326 away from the light incident surface 318. The opposite ends taper off.

By changing the shape, angle, height, depth or arrangement of the second stripe microstructures 312a, the optical tendency and degree of light gathering of the light guide plate 302a can be changed. Therefore, by arranging the second microstructure 312a in the second microstructure region 326 of the light-emitting surface 320 of the light guide plate 302a, the sparser part of the second microstructure 312a is closer to the first microstructure region 324, which can solve the problem of guiding. The bright band problem of the light plate 302a can improve the brightness uniformity; while the denser part of the second stripe microstructure 312a is farther away from the first microstructure region 324, which can increase the brightness of the light guide plate 302a.

In some examples, the light guide plate 302a may further include a plurality of microstructures 332a, and these microstructures 332a are disposed on the light incident surface 318 . Each microstructure 332a can be a stripe structure, such as a V-shaped groove structure or an R-shaped groove structure, that is, the cross-sectional profile of each microstructure 332a is V-shaped, inverted V-shaped or arc-shaped. In a specific example, each microstructure 332a extends along a direction perpendicular to the normal of the light-incident surface 318 . In some examples, the microstructures 332a are arranged continuously, that is, the microstructures 332a are next to each other. In a specific example, as shown in FIG. 11B , in the main body 308a" of the light guide plate 302a" of the light source module 300a", a plurality of microstructures 332a' are disposed discontinuously, that is, the microstructures 332a' are separated from each other.

In some examples, the light emitting surface 320 may further include a blank area 330 between the first microstructure region 324 and the microstructure 332 a , that is, the first striped microstructure 310 a does not extend from the light incident surface 318 . In a specific example, the first striped microstructure 310a extends from the light incident surface 318, and there is no blank space between the microstructure 332a and the first striped microstructure 310a, just like the striped microstructure 204b extends from the light incident surface 208 , as shown in Figure 6B.

Each microstructure 332a can be a convex portion or a concave portion. In an exemplary example, as shown in FIG. 11 , each microstructure 332a is a convex portion. In some examples, each microstructure 332a is a V-shaped groove structure or an R-shaped groove structure, that is, the cross-sectional profile of each microstructure 332a is V-shaped, inverted V-shaped or arc-shaped.

By arranging the microstructure 332a on the light incident surface 318 of the light guide plate 302a, the incident light can be scattered first. Therefore, the brightness distribution uniformity of the area adjacent to the light incident surface 318 can be significantly improved, and the bright spots can be eliminated. The light transmitted in the light guide plate 302 a can be internally reflected by the non-grooved or dotted surface such as the blank area 330 , thus solving the problem of light leakage. Even if a small amount of light cannot be reflected in the light guide plate 302a and becomes light leakage, by setting the first stripe microstructure 310a in the first microstructure area 324 of the light-emitting surface 320 of the light guide plate 302a, the light leakage on the non-visible area can be reduced. for further improvement.

The light source 304 is disposed on the circuit board 306 and electrically connected to the circuit board 306 . The light source 304 is disposed on one side of the light incident surface 318 and adjacent to the light incident surface 318 , so the light source 304 can emit light toward the light incident surface 318 . In an exemplary example, the light source 304 may be a point light source, such as a light emitting diode.

FIG. 12 is a perspective view showing a light source module according to still another embodiment of the present invention. As shown in FIG. 12 , the structure of the light source module 300b in this embodiment is substantially the same as that of the light source module 300a in the above embodiment. The difference between the two structures lies in: the first stripe microstructure 310b of the main body 308b of the light guide plate 302b is a convex portion; the second stripe microstructure 312b of the main body 308b is a concave portion; and the microstructure 332b of the main body 308b is a concave portion. The essential type or arrangement of the first stripe microstructure 310b may be different from that of the second stripe microstructure 312b. In addition, in the light guide plate 302b, the first microstructure area 324 and the second microstructure area 326 are not arranged continuously, and there is a blank area 334 between the first microstructure area 324 and the second microstructure area 326 .

In this embodiment, each first striped microstructure 310b is a V-shaped groove structure, that is, the cross-sectional profile of each first striped microstructure 310b is an inverted V shape. Each microstructure 332b is a V-shaped groove structure, that is, the cross-sectional profile of each microstructure 332b is V-shaped. In addition, each second stripe microstructure 312b is trapezoidal. The gradient of each second stripe microstructure 312b changes gradually along the direction 328 . As shown in FIG. 12 , the gradient of each second striped microstructure 312b can be a depth D or a width W. As shown in FIG. In a specific example, the gradient of each second striped microstructure 312b may include a depth D and a width W. In an exemplary example, as shown in FIG. 12 , each second striped microstructure 312b is a depression, the gradient of each second striped microstructure 312b includes a depth D and a width W, and each second striped microstructure 312b The depth D and width W of are gradually increased from the light incident surface 318 along the direction 328 . In some examples, each second stripe microstructure 312b is a depression, the gradient of each second stripe microstructure 312b includes a depth D, and the depth D of each second stripe microstructure 312b extends from the light incident surface 318 along The direction 328 becomes larger gradually, and the width W of each second striped microstructure 312b is fixed. In a specific example, each second striped microstructure 312b is a depression, the gradient of each second striped microstructure 312b includes a width W, and the width W of each second striped microstructure 312b extends from the light incident surface 318 along the The direction 328 becomes larger gradually, and the height H of each second stripe microstructure 312b is fixed.

Referring again to FIG. 12 , the second microstructure region 326 includes a plane 326 a and a non-plane 326 b, wherein the second microstructure 312 b is located on the non-plane 326 b, and the area without the second microstructure 312 b is the plane 326 . In the second microstructure region 326 of the example shown in FIG. 12 , the ratio of the plane 326a to the non-plane 326b is from an end of the second microstructure region 326 adjacent to the light incident surface 318 toward the second microstructure region 326 away from the light incident surface The opposite end of 318 tapers.

FIG. 13 is a perspective view showing a light source module according to still another embodiment of the present invention. As shown in FIG. 13 , the structure of the light source module 300c of this embodiment is substantially the same as that of the light source module 300a of the above-mentioned embodiment. The stripe microstructure 310c is arc-shaped; the second stripe microstructure 312c of the main body 308c is arc-shaped; and the microstructure 332c of the main body 308c is a depression and is arc-shaped. The essential type or arrangement of the first stripe microstructure 310c may be different from that of the second stripe microstructure 312c. In addition, in the light guide plate 302c, the first microstructure area 324 and the second microstructure area 326 are not arranged continuously, and there is a blank area 334 between the first microstructure area 324 and the second microstructure area 326 .

In this embodiment, each first striped microstructure 310c is an R-shaped groove structure, that is, the cross-sectional profile of each first striped microstructure 310c is arc-shaped. Each microstructure 332c is an R-shaped groove structure, that is, the cross-sectional profile of each microstructure 332c is arc-shaped. In addition, each second stripe microstructure 312c is arc-shaped. The gradient of each second stripe microstructure 312c changes gradually along the direction 328 . As shown in FIG. 13 , the gradient of each second striped microstructure 312c can be a height H or a width W. As shown in FIG. In a specific example, the gradient of each second striped microstructure 312c may include a height H and a width W. In an exemplary example, referring to FIG. 13 again, each second stripe microstructure 312c is a convex portion, the gradient of each second stripe microstructure 312c includes a height H and a width W, and each second stripe microstructure 312c The height H and width W of the structure 312 c gradually increase from the light incident surface 318 along the direction 328 .

Referring to FIG. 13 again, the second microstructure region 326 includes a plane 326a and a non-plane 326b, wherein the second microstructure 312c is located on the non-plane 326b, and the area without the second microstructure 312c is the plane 326a. In the second microstructure region 326 of the example shown in FIG. 13 , the ratio of the plane 326a to the non-plane 326b is from an end of the second microstructure region 326 adjacent to the light incident surface 318 toward the second microstructure region 326 away from the light incident surface The opposite end of 318 tapers.

FIG. 14 is a perspective view showing a light source module according to still another embodiment of the present invention. As shown in FIG. 14 , the structure of the light source module 300d in this embodiment is substantially the same as that of the light source module 300c in the above embodiment. The difference between the two structures lies in: the first stripe microstructure 310d of the main body 308d of the light guide plate 302d is a convex portion; the microstructure 332d of the main body 308d is a convex portion; and the change of the gradient of each second stripe microstructure 312d is different from the gradient of each second stripe microstructure 312c. The essential type or arrangement of the first stripe microstructure 310d may be different from that of the second stripe microstructure 312d.

In this embodiment, as shown in FIG. 14 , the gradient of each second striped microstructure 312d can be a height H or a width W. As shown in FIG. In a specific example, the gradient of each second striped microstructure 312d may include a height H and a width W. In an exemplary example, referring to FIG. 14 again, each second stripe microstructure 312d is a convex portion, the gradient of each second stripe microstructure 312d includes a height H and a width W, and each second stripe microstructure 312d The height H and width W of the structure 312 d gradually decrease from the light incident surface 318 along the direction 328 . In some other examples, when the second microstructures of stripes are depressions, the depth of each of the second microstructures of stripes becomes gradually smaller along the direction 328 from the light incident surface 318 .

Referring to FIG. 14 again, the second microstructure region 326 includes a flat surface 326a and a non-planar surface 326b, wherein the second striped microstructure 312d is located on the non-planar surface 326b, and the region without the second striped microstructure 312d is a flat surface 326a. In the second microstructure region 326 of the example shown in FIG. 14 , the ratio of the plane 326a to the non-plane 326b is from an end of the second microstructure region 326 adjacent to the light incident surface 318 toward the second microstructure region 326 away from the light incident surface The opposite end of 318 becomes progressively larger.

FIG. 15 is a perspective view showing a light source module according to still another embodiment of the present invention. As shown in FIG. 15 , the structure of the light source module 300e of this embodiment is substantially the same as that of the light source module 300c of the above-mentioned embodiment. The body 202a shown in 6A includes a tapered portion 314 and a flat portion 316 directly joined to each other; the second stripe microstructure 312e of the body 308e is a concave portion; and the microstructure 332e of the body 308e is a convex portion. The essential type or arrangement of the first stripe microstructure 310e may be different from that of the second stripe microstructure 312e.

In this embodiment, as shown in FIG. 15 , the first striped microstructure 310 e is disposed on the flat plate portion 316 . In some examples, the blank area 330 is located on the tapered portion 314 (like the light guide plate 206c in FIG. 330, the first stripe microstructure 310e may be directly connected to the bottom edge of the tapered part 314 and then extend backward, or form a certain distance from the bottom edge of the tapered part 314 and then extend backward, as shown in Figure 15 shown. Each second stripe microstructure 312e is an R-shaped groove structure, that is, the cross-sectional profile of each second stripe microstructure 312e is arc-shaped. Each microstructure 332e is an R-shaped groove structure, that is, the cross-sectional profile of each microstructure 332e is arc-shaped.

Referring to FIG. 15 again, the second microstructure region 326 includes a plane 326a and a non-plane 326b, wherein the second microstructure 312e is located on the non-plane 326b, and the region without the second microstructure 312e is the plane 326a. In the second microstructure region 326 of the example shown in FIG. 15 , the ratio of the plane 326a to the non-plane 326b is from an end of the second microstructure region 326 adjacent to the light incident surface 318 toward the second microstructure region 326 away from the light incident surface The opposite end of 318 tapers.

It can be seen from the above-mentioned embodiments that the advantage of the present invention is that several stripe microstructures are arranged in the first microstructure area of the light-emitting surface adjacent to the light-incident surface of the light guide plate, and these stripe microstructures are along the direction from the side of the main body adjacent to the light-incident surface to the The main body extends in a direction away from the other side of the light incident surface. Therefore, light leakage on the non-visible area close to the light incident surface can be improved.

It can be seen from the above embodiments that another advantage of the present invention is that the second microstructure region disposed after the first microstructure region on the light-emitting surface of the light guide plate is provided with many second stripe microstructures. By changing the shape, angle, height, depth or arrangement of the second stripe microstructures according to the gradient of each second stripe microstructure, the optical tendency and degree of light gathering of the light guide plate can be changed. Preferably, the sparser part of the second stripe microstructure is closer to the first microstructure region, which can solve the problem of bright bands in the light guide plate and improve brightness uniformity; while the denser part of the second stripe microstructure is farther away from the first microstructure region. The structure area can increase the brightness of the light guide plate.

It can be seen from the above-mentioned embodiments that another advantage of the present invention is that since the light-incident surface is provided with microstructures, the brightness distribution uniformity of the area adjacent to the light-incident surface can be significantly improved, thereby eliminating bright spots.

Although the present invention has been disclosed above with the embodiment, the embodiment is not intended to limit the present invention, and any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore The protection scope of the present invention shall be determined by the scope defined in the claims.

Symbol Description:

100 backlight modules

100a backlight module

102 light guide plate

102a light guide plate

104 light emitting surface

104a Light-emitting surface

106 incident surface

108 LEDs

110 light

112 shelter

114 eyes

116 highlights

116a highlights

118 non-visual area

120 taper

122 flat plate

200 light source modules

200a light source module

200b light source module

200c light source module

200d light source module

200e light source module

202 subject

202a subject

202b subject

204 stripe microstructure

204a stripe microstructure

204b stripe microstructure

204c stripe microstructure

204d point microstructure

206 light guide plate

206a light guide plate

206b light guide plate

206c light guide plate

206d light guide plate

206e light guide plate

208 incident surface

210 light emitting surface

212 reflective surface

214 Microstructure

216 shelter

218 light source

220 light emitting surface

222 microstructure area

224 Flat Board

226 Taper

228 first end

230 second end

232 distance

234 directions

236 measuring lines

238 brightness distribution curve

240 brightness distribution curve

242 first side

244 second side

300a light source module

300a' light source module

300a″ light source module

300b light source module

300c light source module

300d light source module

300e light source module

302a light guide plate

302a' light guide plate

302a"light guide plate

302b light guide plate

302c light guide plate

302d light guide plate

302e light guide plate

304 light sources

306 circuit board

308a subject

308a' subject

308a″ body

308b subject

308c subject

308d subject

308e subject

310a first stripe microstructure

310a' first stripe microstructure

310b first stripe microstructure

310c first stripe microstructure

310d first stripe microstructure

310e first stripe microstructure

312a second stripe microstructure

312b second stripe microstructure

312c second stripe microstructure

312d second stripe microstructure

312e second stripe microstructure

314 taper

316 Flat Board

318 incident surface

320 light emitting surface

322 reflective surface

324 first microstructure area

326 second microstructure area

326a plane

326b non-planar

328 directions

330 blank area

332a Microstructure

332a' Microstructure

332b Microstructure

332c Microstructure

332d Microstructure

332e Microstructure

334 blank area

D depth

H height

W width

θ opening angle

ψ Central angle

Claims (40)

1. A light guide plate, comprising: The main body includes a light incident surface and an optical surface, wherein the light incident surface joins the optical surface, and the optical surface includes a first microstructure area and a second microstructure area arranged in sequence, and the first microstructure area closer to the light incident surface than the second microstructure region; A plurality of first striped microstructures are arranged in the first microstructure region along the direction from the side of the body adjacent to the light-incident surface to the other side of the body away from the light-incident surface direction extension; and A plurality of second striped microstructures are arranged in the second microstructure region along the direction, wherein the gradient of each second striped microstructure changes gradually along the direction. 2. The light guide plate according to claim 1, further comprising a plurality of microstructures disposed on the light incident surface. 3. The light guide plate according to claim 2, wherein a cross-sectional profile of each of the microstructures or each of the first stripe microstructures is V-shaped, inverted V-shaped or arc-shaped. 4. The light guide plate according to claim 2, wherein each of the microstructures is a convex portion or a concave portion. 5. The light guide plate according to claim 1, wherein the optical surface further comprises a blank area between the first microstructure area and the light incident surface. 6. The light guide plate according to claim 1, wherein the main body comprises: a taper having opposing first and second ends, wherein the thickness of the first end is greater than the thickness of the second end; and The flat plate portion extends from the second end along the direction, wherein the thickness of the flat plate portion is equal to the thickness of the second end. 7. The light guide plate according to claim 6, wherein the first stripe microstructure is provided on the flat plate portion. 8. The light guide plate according to claim 6, wherein the optical surface further comprises a blank area between the first microstructure area and the microstructure, and the blank area is located at the tapered portion, or the tapered portion and the flat portion. 9. The light guide plate according to claim 1, wherein the first stripe microstructures are adjacent to each other. 10. The light guide plate according to claim 1, wherein the first stripe microstructures are separated from each other. 11. The light guide plate according to claim 1, wherein each of the first stripe microstructures is a convex portion or a concave portion. 12. The light guide plate according to claim 1, wherein each of the second stripe microstructures is a convex portion or a concave portion. 13. The light guide plate according to claim 12, wherein When each of the second stripe microstructures is the convex portion, the gradient of each of the second stripe microstructures includes the height of each of the second stripe microstructures, and each of the second stripe microstructures The height of the two stripe microstructures gradually increases from the light incident surface along the direction; and When each of the second stripe microstructures is the depression, the gradient of each of the second stripe microstructures includes the depth of each of the second stripe microstructures, and each of the second The depth of the stripe microstructure gradually increases from the light incident surface along the direction. 14. The light guide plate according to claim 13, wherein the gradient of each of the second micro-stripes further includes the width of each of the second micro-stripes, and each of the second micro-stripes The width of the structure becomes gradually larger from the light incident surface along the direction. 15. The light guide plate according to claim 12, wherein When each of the second stripe microstructures is the convex portion, the gradient of each of the second stripe microstructures includes the height of each of the second stripe microstructures, and each of the second stripe microstructures The height of the two stripe microstructures gradually decreases along the direction from the light incident surface; and When each of the second stripe microstructures is the depression, the gradient of each of the second stripe microstructures includes the depth of each of the second stripe microstructures, and each of the second The depth of the stripe microstructure gradually decreases from the light incident surface along the direction. 16. The light guide plate according to claim 15, wherein the gradient of each of the second stripe microstructures further includes the width of each of the second stripe microstructures, and each of the second stripe microstructures The width of the structure becomes gradually smaller from the light incident surface along the direction. 17. The light guide plate according to claim 1, wherein a cross-sectional profile of each of the second stripe microstructures is V-shaped, inverted V-shaped, arc-shaped or trapezoidal. 18. The light guide plate according to claim 1, wherein the gradient of each of the second micro-stripes further includes the width of each of the second micro-stripes, and each of the second micro-stripes The width of the structure becomes gradually larger from the light incident surface along the direction. 19. The light guide plate according to claim 1, wherein the gradient of each of the second stripe microstructures further includes the width of each of the second stripe microstructures, and each of the second stripe microstructures The width of the structure becomes gradually smaller from the light incident surface along the direction. 20. A light source module, comprising: A light guide plate according to any one of claims 1 to 19; and A plurality of light sources are arranged adjacent to the light incident surface of the light guide plate. 21. A light guide plate, comprising: The main body includes a light incident surface and an optical surface, wherein the optical surface includes a first microstructure area and a second microstructure area arranged in sequence, and the first microstructure area is adjacent to the second microstructure area. incident light surface; a plurality of first microstructures disposed in the first microstructure region; and A plurality of second microstructures are disposed in the second microstructure region, wherein the essential type or arrangement of the first microstructures is different from the essential type or arrangement of the second microstructures. 22. The light guide plate according to claim 21, further comprising a plurality of third microstructures disposed on the light incident surface. 23. The light guide plate according to claim 21, wherein the second microstructure region comprises a plane and a non-plane, the second microstructure is located on the non-plane, and the ratio of the plane to the non-plane Changes from one end of the second microstructure region adjacent to the light incident surface toward an opposite end of the second microstructure region away from the light incident surface. 24. The light guide plate of claim 23, wherein the ratio of the planar to the non-planar is from the end adjacent to the light incident surface towards the opposite end away from the light incident surface Gradually get smaller. 25. The light guide plate of claim 23, wherein the ratio of the planar to the non-planar is from the end adjacent to the light incident surface toward the opposite end away from the light incident surface Gradually get bigger. 26. A light source module, comprising the light guide plate according to any one of claims 21 to 25, and a plurality of light sources arranged adjacent to the light incident surface of the light guide plate. 27. A light guide plate, comprising: The main body includes a light incident surface and an optical surface, wherein the optical surface includes a first microstructure area and a second microstructure area arranged in sequence, and the first microstructure area is adjacent to the second microstructure area. a light incident surface, and there is a blank area between the first microstructure area and the second microstructure area; a plurality of first microstructures disposed in the first microstructure region; and A plurality of second microstructures are arranged in the second microstructure area, wherein the second microstructure area includes a plane and a non-plane, the second microstructure is located on the non-plane, and the plane pair The proportion of the non-planarity varies from an end of the second microstructure region adjacent to the light incident surface toward an opposite end of the second microstructure region away from the light incident surface. 28. The light guide plate according to claim 27, wherein the essential type or arrangement of the first microstructures is different from that of the second microstructures. 29. The light guide plate according to claim 27, further comprising a plurality of third microstructures disposed on the light incident surface. 30. The light guide plate of claim 27, wherein the ratio of the planar to the non-planar is from the end adjacent to the light incident surface toward the opposite end remote from the light incident surface Gradually get smaller. 31. The light guide plate of claim 27, wherein the ratio of the planar to the non-planar is from the end adjacent to the light incident surface toward the opposite end remote from the light incident surface Gradually get bigger. 32. A light source module, comprising the light guide plate according to any one of claims 27 to 31, and a plurality of light sources arranged adjacent to the light incident surface of the light guide plate. 33. A light guide plate, comprising: The main body includes a light incident surface and an optical surface, wherein the optical surface includes a first microstructure area and a second microstructure area arranged in sequence, and the first microstructure area is adjacent to the second microstructure area. On the light incident surface, there is a blank area between the first microstructure area and the second microstructure area, and there is another blank area between the first microstructure area and the light incident surface; A plurality of first microstructures are arranged in the first microstructure area; a plurality of second microstructures disposed in the second microstructure region; and A plurality of third microstructures are arranged on the light incident surface. 34. The light guide plate according to claim 33, wherein the essential type or arrangement of the first microstructures is different from that of the second microstructures. 35. The light guide plate according to claim 33, wherein the second microstructure region comprises a plane and a non-plane, the second microstructure is located on the non-plane, and the ratio of the plane to the non-plane Changes from one end of the second microstructure region adjacent to the light incident surface toward an opposite end of the second microstructure region away from the light incident surface. 36. The light guide plate of claim 35, wherein the ratio of the planar to the non-planar is from the end adjacent to the light incident surface toward the opposite end remote from the light incident surface Gradually get smaller. 37. The light guide plate of claim 35, wherein the ratio of the planar to the non-planar is from the end adjacent to the light incident surface towards the opposite end remote from the light incident surface Gradually get bigger. 38. The light guide plate according to claim 33, wherein the third microstructures are continuously disposed on the light incident surface. 39. The light guide plate according to claim 33, wherein the third microstructures are discontinuously disposed on the light incident surface. 40. A light source module, comprising the light guide plate according to any one of claims 33 to 39, and a plurality of light sources arranged adjacent to the light incident surface of the light guide plate.