CN209911590U

CN209911590U - Light guide plate

Info

Publication number: CN209911590U
Application number: CN201920488992.5U
Authority: CN
Inventors: 方运; 刘伟
Original assignee: Upgrade Photoelectric (kunshan) Co Ltd
Current assignee: Upgrade Photoelectric (kunshan) Co Ltd; Shine Optoelectronics Kunshan Co Ltd
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2020-01-07
Anticipated expiration: 2029-04-11

Abstract

The utility model provides a light guide plate, which comprises a main body, a plurality of light guide units and a point light source, wherein the main body comprises a light inlet surface and a light outlet surface, and the point light source is arranged on the light inlet surface side; the light guide unit comprises a top edge, two side edges and a bottom edge, the top edge is arranged towards the light incident surface, and the length of the top edge of the light guide unit is smaller than that of the bottom edge; the light guide units are distributed on the light emitting surface and/or the light emitting surface opposite surface along the arc by taking the point light source as the center, so that the reflection of the light guide plate to light can be improved, the uniformity of the light guide plate is improved, and the brightness of the light guide plate is enhanced.

Description

Light guide plate

Technical Field

The utility model relates to a field in a poor light, in particular to light guide plate.

Background

The main function of the light guide plate is to convert light into uniform light and emit the uniform light from the light emitting surface, and the light emitting performance of the light guide plate directly affects the light emitting visual angle, the brightness and the image definition of the backlight module. The method comprises the following steps of firstly, arranging a micro-nano structure on a light-emitting surface or the opposite surface of the light-emitting surface, converting light rays into uniform light by utilizing the reflection or refraction of the micro-nano structure, and emitting the uniform light from the light-emitting surface, but the method has the defect that light and shade alternate stripes appear in an image of a display; secondly, the micro-nano structure is arranged on the light incoming surface, and the micro-nano structure is arranged on the light outgoing surface or the opposite surface of the light outgoing surface, so that the method has the defect that the brightness of the light guide plate is poor due to the fact that light rays are reflected and refracted in a large quantity.

SUMMERY OF THE UTILITY MODEL

The utility model provides a light guide plate is in order to solve above-mentioned problem.

The utility model relates to a technical scheme of light guide plate is:

a light guide plate, comprising:

the main body comprises a light incident surface and a light emergent surface;

a point light source located on the light entrance surface side;

the light guide unit comprises a top edge, two side edges and a bottom edge, the top edge is arranged from the light incident surface to the bottom edge, and the length of the top edge is smaller than that of the bottom edge; the top edges of the light guide units are distributed on the light-emitting surface and/or the opposite surface of the light-emitting surface along an arc shape by taking the point light source as a center.

In one embodiment, the light guide units are provided with a plurality of first light guide surfaces and a plurality of second light guide surfaces, wherein the first light guide surfaces form an acute angle beta with the direction from the bottom edge to the top edge, the second light guide surfaces form an acute angle alpha with the direction from the top edge to the bottom edge, the included angle beta is larger than the included angle alpha, and beta is larger than 10 degrees and smaller than or equal to 30 degrees, and alpha is larger than or equal to 1 degree and smaller than or equal to 10 degrees.

In one embodiment, in a direction parallel to the light incident surface, the distance from the top edge to the light incident surface decreases from the point light source to two sides.

In one embodiment, the light guide plate includes a plurality of point light sources, and at least one group of the plurality of light guide units is arranged in an arc shape with one of the point light sources as a center.

In one embodiment, the shape of the side edge is one or a combination of two or more of a straight line, a curve, an arc line and a wavy line.

In one embodiment, the light guide units are disposed in a plurality of protruding structures and/or recessed structures.

In one embodiment, the light guide units are arranged at intervals, and no structure is arranged between every two adjacent light guide units.

In one embodiment, the lengths of the bottom sides of the light guide units are equal, and the distances between any two adjacent light guide units at the bottom sides are equal or unequal.

In one embodiment, a joint between the plurality of first light guide surfaces and the plurality of second light guide surfaces is one or a combination of two or more of an arc shape, a V shape, an S shape, a wave shape, a trapezoid shape, or a polygon shape.

In one embodiment, the light guide plate further includes a light-condensing layer, the light-condensing layer is disposed by a plurality of convex structures and/or concave structures, and the plurality of convex structures and/or concave structures are continuously and/or intermittently distributed on opposite sides of the plurality of light guide units.

The utility model has the advantages that: the length of the top edge of the light guide unit is smaller than that of the bottom edge, and the top edge points to the light incident surface, and the plurality of light guide units are distributed in an arc shape by taking the point light source as the center, so that more uniform light rays are emitted from the light emergent surface of the light guide plate, and the brightness of the light guide plate is improved.

Drawings

Fig. 1 is a schematic structural view of a light guide plate according to the present invention;

fig. 2 is a schematic view of the present invention in a partial cross-section in fig. 1;

fig. 3 is a schematic side view of a portion of fig. 1 according to the present invention.

Detailed Description

With the understanding of the present invention facilitated, the present invention will be described more fully with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a light guide plate, which comprises a main body, a plurality of light guide units and a point light source, wherein the main body comprises a light inlet surface and a light outlet surface, and the point light source is arranged on the light inlet surface side; the light guide unit comprises a top edge, two side edges and a bottom edge, the top edge is arranged from the light incident surface to the bottom edge, the length of the top edge of the light guide unit is smaller than that of the bottom edge, and the plurality of light guide units are distributed on the light emergent surface and/or the light emergent surface opposite surface along an arc by taking the point light source as the center, so that the reflection of the light guide plate to light rays can be improved, the uniformity of the light guide plate is improved, and the brightness of the.

In one embodiment, the point light source is used as the center of the circular arc, the light guide plate comprises a plurality of point light sources, and at least one group of a plurality of light guide units are distributed along the arc by using one point light source as the center.

In one embodiment, the light guide units are provided with a plurality of first light guide surfaces and a plurality of second light guide surfaces, wherein the first light guide surfaces and the second light guide surfaces form an acute angle beta with the direction from the bottom edge to the top edge, the acute angle alpha with the direction from the top edge to the bottom edge is formed, the included angle beta is larger than the included angle alpha, beta is larger than 10 degrees and smaller than or equal to 30 degrees, and alpha is larger than or equal to 1 degree and smaller than.

In one embodiment, in a direction parallel to the light incident surface, the closer the light guide unit is to the point light source, the greater the distance from the top edge to the light incident surface, the farther the light guide unit is from the point light source, and the smaller the distance from the top edge of the light guide unit to the light incident surface, so that the light rays are emitted more uniformly from the light emitting surface.

In one embodiment, the side edge of each light guide unit is one or a combination of more than two of a straight line, a curve, an arc line and a wavy line; the shapes of two side edges of the same light guide unit are arranged differently or identically.

In one embodiment, the plurality of light guide units are arranged in a plurality of protruding structures and/or recessed structures, the plurality of light guide units are distributed at intervals, no structure is arranged between every two adjacent light guide units, the bottom edges of the plurality of light guide units are equal, and the distance between any two adjacent light guide units is equal or unequal at the bottom edges.

In one embodiment, the light guide unit is provided with a plurality of first light guide surfaces and a plurality of second light guide surfaces which are obliquely arranged, the plurality of first light guide surfaces and the plurality of second light guide surfaces are respectively parallel to the light incident surface, the lower connection part of the plurality of first light guide surfaces and the plurality of second light guide surfaces is arranged in a V shape, the upper connection part is arranged in an inverted V shape, and in other modes, the upper connection part or the lower connection part of the plurality of first light guide surfaces and the plurality of second light guide surfaces is one or a combination of more than two of an arc shape, an S shape, a wave shape, a trapezoid shape or a polygon shape.

In one embodiment, the light guide plate further comprises a light-condensing layer disposed on the plurality of convex structures and/or concave structures, the light-condensing layer is located on the opposite side of the plurality of light guide units, and the plurality of convex structures and/or concave structures are arranged at intervals and/or continuously; the section of the plurality of convex structures and/or concave structures is one or the combination of more than two of arc, semicircle, triangle or polygon; the convex structure and/or the concave structure is arranged by a cylindrical mirror, a small short line or a micro lens.

Referring to fig. 1, fig. 1 is a schematic structural diagram of another light guide plate 100 according to the present invention. The light guide plate 100 includes a main body 110, a plurality of light guide units 120 and a light source 130, wherein the main body 110 includes a light incident surface 111, a light emitting surface 112 and an opposite surface 113; the light source 130 is a point light source and is located on the light incident surface 111 side. The light guide units 120 are distributed on the light emitting surface 112 along the electric light source 130 in an arc shape, the light guide unit 120 includes a top side 1201, a bottom side 1202 and two side edges 1203, the top side 1201 is arranged to point to the light incident surface 111, the length of the top side 1201 is smaller than that of the bottom side 1202, the lengths of the bottom sides 1202 of the light guide units 120 are equal, and the light guide units 120 are arranged in a convex manner; the plurality of light guide units 120 are arranged at intervals, and at the bottom side 1202, the distance between any two adjacent light guide units 120 is equal; in the direction parallel to the light incident surface 111, the closer the light guide unit 120 is to the point light source 130, i.e., the stronger the light ray, the greater the distance from the top side 1201 of the light guide unit 120 to the light incident surface 111; the farther the light guide unit 120 is from the point light source 130, i.e., the weaker the light, the smaller the distance from the top side 1201 of the light guide unit 120 to the light incident surface 111, so that the light can be emitted from the light emitting surface 112 more uniformly. The light guide plate 100 further includes a light-gathering layer 140, which mainly prevents light from diffusing and can gather light to improve the brightness of the light guide plate.

Referring to fig. 2, fig. 2 is a partial sectional view of fig. 1, in which a plurality of first light guide surfaces 150 and a plurality of second light guide surfaces 160 are obliquely disposed on the plurality of light guide units 120, and the first light guide surface forming an acute angle β with the direction from the bottom edge to the top edge is the first light guide surface, and the second light guide surface forming an acute angle α with the direction from the top edge to the bottom edge is the second light guide surface. The range of the angle α is 1 ° to 10 °, the angle β is greater than 10 ° and less than or equal to 30 °, and the angle β is greater than the angle α, so that more incident light rays can be reflected, and the brightness of the light guide plate 100 can be increased. The lower connection point of the first light guide surface 150 and the second light guide surface 160 is V-shaped, the width W of the opening of the V-shaped structure is equal, and the depth H from the opening to the lower connection point of the first light guide surface 150 and the second light guide surface 160 is also equal. The light guide plate 100 further includes a light-condensing layer 140 disposed on the light-emitting surface opposite to the light-emitting surface of the light guide plate 100.

Referring to fig. 3, fig. 3 is a partial side view of the bottom side 1202 of fig. 1, the light guiding units 120 are spaced apart by a distance P1, wherein the distance P1 is equal; the length of the bottom side of the single light guide unit 120 is P2, wherein the lengths P2 of the bottom sides of the light guide units 120 are equal. In other embodiments, the pitches P1 of the light guide units 120 are not equal, and the pitch P1 is utilized to adjust the density between the light guide units 120 so as to change the brightness of the light guide plate 100, thereby improving the uniformity of the light emitted from the light emitting surface 112. Preferably, the light-condensing layer 140 includes a plurality of convex structures 1401, the convex structures 1401 are arranged for the whole cylindrical mirror, and the cross-sectional shape of the plurality of convex structures 1401 is arc-shaped and is continuously arranged; in the figure, the width w1 of each protruding structure 1401 is equal and the height h1 is also equal, so as to prevent the total reflection of light in the light guide plate 100.

In other modes, the light-gathering layer is of a plurality of concave structures or partial concave structures of partial convex structures, and the plurality of convex structures and/or concave structures are arranged in a small short line or micro-lens arrangement mode and are continuously or alternately arranged on the opposite surface of the light-emitting surface; the width and/or height of the plurality of convex structures and/or concave structures are arranged in different ways, and the cross section of the plurality of convex structures and/or concave structures is one or the combination of more than two of semicircle, triangle or polygon.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail with reference to the accompanying drawings. In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the invention. Moreover, the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A light guide plate, comprising:

the main body comprises a light incident surface and a light emergent surface;

a point light source located on the light entrance surface side;

2. The light guide plate according to claim 1, wherein the plurality of light guide units are provided with a plurality of first light guide surfaces and a plurality of second light guide surfaces, the first light guide surfaces and the second light guide surfaces form an acute angle β with the bottom edge pointing to the top edge, the acute angle β is larger than the acute angle α, and the acute angle β is larger than the acute angle α, wherein β is larger than 10 ° and smaller than 30 °, and α is larger than 1 ° and smaller than 10 °.

3. The light guide plate of claim 1, wherein the distance from the top edge to the light incident surface decreases from the point light source to both sides in a direction parallel to the light incident surface.

4. The light guide plate according to claim 1, wherein the light guide plate comprises a plurality of point light sources, and at least one group of the plurality of light guide units is arranged in an arc shape with one of the point light sources as a center.

5. The light guide plate according to claim 1, wherein the shape of the side edge is one or a combination of two or more of a straight line, a curved line, an arc line and a wavy line.

6. The light guide plate according to claim 1, wherein the plurality of light guide units are disposed in a plurality of convex structures and/or concave structures.

7. The light guide plate according to claim 1, wherein the light guide units are spaced apart from each other, and no structure is disposed between adjacent light guide units.

8. The light guide plate according to claim 7, wherein the light guide units have equal lengths at their bottom sides, and the distance between any two adjacent light guide units is equal or different at the bottom sides.

9. The light guide plate according to claim 2, wherein the connection between the first light guide surfaces and the second light guide surfaces is one or a combination of two or more of arc, V, S, wave, trapezoid, or polygon.

10. The light guide plate according to any one of claims 1 to 9, further comprising a light-condensing layer, wherein the light-condensing layer is disposed by a plurality of convex structures and/or concave structures, and the plurality of convex structures and/or concave structures are continuously and/or intermittently distributed on opposite sides of the plurality of light guide units.