CN210090724U

CN210090724U - Double-sided light guide plate

Info

Publication number: CN210090724U
Application number: CN201921258939.2U
Authority: CN
Inventors: 梅坦; 史正华
Original assignee: Talant Optronics Suzhou Co ltd
Current assignee: Talant Optronics Suzhou Co ltd
Priority date: 2019-08-05
Filing date: 2019-08-05
Publication date: 2020-02-18
Anticipated expiration: 2029-08-05

Abstract

The utility model relates to a double-sided light guide plate, include: the substrate comprises a light incident surface, a light emergent surface adjacent to the light incident surface, a reflecting surface opposite to the light emergent surface and a light stopping surface opposite to the light incident surface; the light emergent surface is provided with a plurality of first concave grooves which are arranged along the same direction, and the depth of each first concave groove increases from the light incident surface to the light stopping surface; the reflecting surface is provided with a plurality of second concave grooves which are arranged along the same direction, and the depth of each second concave groove increases from the light incident surface to the light stopping surface; the reflecting surface is also provided with a plurality of inwardly concave micro-mesh points, and the outlines of the micro-mesh points tend to increase from the light incident surface to the light stopping surface. The technical effects are as follows: under the effect of first concave groove, second concave groove and little site, form all directions reflection and repeated refraction for light obtains the reflection of wider wide range, has improved the light utilization ratio, has improved the luminousness. The microstructure is increased to improve the refractive index of light.

Description

Double-sided light guide plate

Technical Field

The utility model relates to a light guide plate technical field especially relates to a two-sided light guide plate.

Background

The light guide plate is mainly applied to the fields of liquid crystal display, advertisement display, decoration and decoration, refrigerator illumination and the like so as to realize a better light emitting effect. Specifically, the light guide plate utilizes the mesh points to destroy the total reflection of the light source, so that the light comes out of the light guide plate, the purpose that the linear light source is changed into a surface light source is realized, and a light emitting source is provided for the display.

In a conventional side-entry type double-sided light guide plate, one side surface of the light guide plate is defined as a light incident surface, two opposite surfaces adjacent to and perpendicular to the light incident surface are a reflection surface and a light emitting surface respectively, and mesh points are arranged on the reflection surface and the light emitting surface. Light emitted by the light bar enters the light guide plate from the light incident surface, total reflection of the light is damaged when the light is transmitted to the dots of the reflecting surface and the light emitting surface, and the light is refracted out from the light emitting surface of the light guide plate to form a backlight source.

In the process of implementing the conventional technique, the inventors found that: the light is comparatively dispersed when the light exits from the light guide plate, and the utilization ratio of the light is lower.

SUMMERY OF THE UTILITY MODEL

Accordingly, it is necessary to provide a double-sided light guide plate to solve the problems of light scattering when the light exits from the light guide plate and low light utilization rate.

A double-sided light guide plate comprising: the substrate comprises a light incident surface, a light emergent surface adjacent to the light incident surface, a reflecting surface opposite to the light emergent surface and a light stopping surface opposite to the light incident surface; the light emergent surface is provided with a plurality of first concave grooves which are arranged along the same direction, and the depth of the first concave grooves increases from the light incident surface to the light stopping surface; the reflecting surface is provided with a plurality of second concave grooves which are arranged along the same direction, and the depth of each second concave groove increases from the light incident surface to the light stopping surface; the reflecting surface is also provided with a plurality of inwardly concave micro-mesh points, and the outlines of the micro-mesh points tend to increase from the light incident surface to the light stopping surface.

The technical scheme at least has the following technical effects: set up first concave groove at the play plain noodles of light guide plate, set up second concave groove and little site at the plane of reflection of light guide plate, in light got into the light guide plate from going into the plain noodles, under the effect of first concave groove, second concave groove and little site, formed all directions reflection and repeated refraction for light obtains the reflection of wider wide range, has improved light utilization ratio, has improved the luminousness. Because the light-stopping surface and the light incident surface have a certain distance, in order to make the light more uniform, the depth of the first concave groove and the depth of the second concave groove are set to be increased, the refractive index of the light is improved, the outline of the micro-mesh point is set to be increased, and the effect of making the refractive index more uniform is achieved. Meanwhile, the Moire pattern phenomenon is formed on the surface of the light guide plate, so that the atomization degree of the surface is increased, a good shielding effect on foreign matters and stains on the surface of the light guide plate can be realized, and the reject ratio of products is reduced.

In one embodiment, the depth of the first concave groove at the light incident surface ranges from 15 micrometers to 80 micrometers, and the depth of the first concave groove at the light emergent surface ranges from 25 micrometers to 150 micrometers.

In one embodiment, the depth of the second concave groove at the light incident surface ranges from 15 micrometers to 80 micrometers, and the depth of the second concave groove at the light emergent surface ranges from 25 micrometers to 150 micrometers.

In one embodiment, the width of the first concave groove increases from the light incident surface to the light stop surface; and/or the width of the second concave groove increases from the light incident surface to the light stopping surface.

In one embodiment, the width of the first concave groove from the light incident surface to the light stop surface ranges from 50 micrometers to 300 micrometers; and/or the width range of the second concave groove from the light incident surface to the light stopping surface is 50-300 microns.

In one embodiment, the first concave groove and the second concave groove are distributed in a staggered mode.

In one embodiment, the distance between two points with the largest distance in the outline of the micro-dots ranges from 30 micrometers to 150 micrometers.

In one embodiment, the distance between two points with the largest distance in the outline of the micro-dots is larger than the width of the second concave groove.

Drawings

Fig. 1 is a schematic structural view of a double-sided light guide plate according to an embodiment of the present invention;

fig. 2 is a flow chart illustrating a manufacturing process of a double-sided light guide plate according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a mold according to an embodiment of the present invention;

fig. 4 is a schematic diagram of laser dotting according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a rolling process in a roller press according to an embodiment of the present invention.

Wherein:

100. double-sided light guide plate 110, substrate 112 and light incident surface

114. Light-emitting surface 116, reflecting surface 118 and light-stopping surface

120. First concave groove 130, second concave groove 140, micronic dot

200. Mold 210, first microstructure 220, and mesh point

300. Laser dotting machine 400, roller press 410 and upper roller

420. Lower roller 500, single-sided light guide plate 510, and second microstructure

520. Smooth surface 530, structured surface 600, light source

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present 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 present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

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 in the description of the invention herein 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.

Referring to fig. 1, an embodiment of the present invention provides a double-sided light guide plate 100, including: a substrate 110, the substrate 110 including a light incident surface 112, a light emitting surface 114 adjacent to the light incident surface 112, a reflecting surface 116 opposite to the light emitting surface 114, and a light stopping surface 118 opposite to the light incident surface 112; the light-emitting surface 114 is provided with a plurality of first concave grooves 120 arranged along the same direction, and the depth H of the first concave grooves 120 increases from the light-incident surface 112 to the light-stopping surface 118; the reflecting surface 116 has a plurality of second concave grooves 130 arranged along the same direction, and the depth of the second concave grooves 130 increases from the light incident surface 112 to the light stopping surface 118; the reflective surface 116 further has a plurality of micro-dots 140 recessed inward, and the outlines of the micro-dots 140 increase from the incident surface 112 to the light-stopping surface 118.

The substrate 110 may be an optical-grade plate made of acrylic (PMMA), Polycarbonate (PC), or the like. In the embodiment of the present invention, the substrate 110 is provided with a light incident surface 112 and a light stop surface 118 which are oppositely disposed, and a light emitting surface 114 and a reflecting surface 116 which are oppositely disposed, wherein the light incident surface 112 is adjacent to the light emitting surface 114 and the reflecting surface 116, and the light stop surface 118 is also adjacent to the light emitting surface 114 and the reflecting surface 116. The light source 600 is disposed at one side of the light guide plate, so the light incident surface 112 is one side surface of the substrate 110. The light enters the light guide plate from the light incident surface 112, stops propagating through the light stop surface 118, and exits from the light exit surface 114 through multiple reflection and refraction of the light exit surface 114 and the reflection surface 116, so that the light is uniformly utilized.

The first concave groove 120 is disposed on the light-emitting surface 114 and extends from the light-incident surface 112 to the light-stopping surface 118. The plurality of first concave grooves 120 are arranged at equal intervals or at unequal intervals, and a flat transition section is provided between adjacent first concave grooves 120. The groove shape of the first concave groove 120 may be a V shape, a circular arc shape, an elliptical arc shape, or the like. The depth H of the first concave groove 120 can be understood as the distance between the lowest point of the groove bottom and the plane formed by the notch as shown in fig. 1. Since the light source 600 is disposed at one side of the light guide plate, resulting in a certain distance between the light-stopping surface 118 and the light-entering surface 112, if the first concave groove 120 uniformly extends from the light-entering surface 112 to the light-stopping surface 118, the emergent light cannot be made more uniform, and the emergent distribution of light is more sparse in the portion near the light-stopping surface 118 relative to the portion near the light-entering surface 112. The research shows that the smaller the depth, the lower the light refractive index, the larger the depth, the higher the light refractive index, the higher the light luminance, and the higher the light emitting efficiency. Therefore, in the embodiment of the present invention, the depth H of the first concave groove 120 is set to be the increasing trend from the light incident surface 112 to the light stopping surface 118, so as to enhance the refraction intensity of the light when being close to the light stopping surface 118, and to play the role of uniform light outgoing distribution and improving the light utilization rate.

The second concave groove 130 is disposed on the reflective surface 116 and extends from the light incident surface 112 to the light stopping surface 118. The plurality of second concave grooves 130 are arranged at equal intervals or at unequal intervals, and a flat transition section is provided between adjacent second concave grooves 130. The groove shape of the second concave groove 130 may be a V shape, a circular arc shape, an elliptical arc shape, or the like. The depth of the second concave groove 130 can be understood as the distance between the lowest point of the groove bottom and the plane formed by the notch. The first and second

concave grooves

120 and 130 may have the same groove type, depth and pitch, or different groove types, depths and pitches. Based on the same reason with first concave groove 120, the embodiment of the utility model provides an in, set up the degree of depth of second concave groove 130 to be the trend of increase from going into plain noodles 112 to light stopping surface 118 to strengthen the refracting strength of light when being close to light stopping surface 118, play even light outgoing distribution and improve the effect of light utilization ratio.

The micro-dots 140 are disposed on the reflective surface 116, and may be formed completely or incompletely at the flat transition section between the adjacent second concave grooves 130, or incompletely formed in the second concave grooves 130. The concave shape formed by the micro-dots 140 may be a spherical crown shape, an ellipsoidal crown shape similar to the spherical crown shape, a cone shape, or the like. The outline of the halftone dot 140 may be understood as an outline surrounded by the surface edge of the transition or second concave groove 130 in a concave shape. Since there is a certain distance between the light-stopping surface 118 and the light-entering surface 112, if the micro-dots 140 are uniformly disposed on the reflecting surface 116, they cannot perform the function of uniform refraction. Therefore, in the embodiment of the present invention, the outline of the micro dots 140 is set to be increased, so as to expand the refraction range and uniform the refraction index. In addition, the depth of the micro-grid point 140 may also be set to be increased, so as to enhance the refraction intensity of the light when the light approaches the light-stopping surface 118, increase the luminance of the light, and improve the light-emitting efficiency.

The light is repeatedly refracted under the combined action of the first concave groove 120 and the second concave groove 130, the diffusion area of the light is obviously larger than that of a single-sided light guide plate, so that the light is reflected and refracted in a wider range, and the light efficiency is improved by 4.0% -5.0% compared with that of the conventional light guide plate, so that a Moire phenomenon (Moire phenomenon is a visual phenomenon and interference fringes on an object with a certain interval) is formed on the surface of the light guide plate, the human eye cannot identify the formed fuzzy phenomenon, foreign matters and stains on the surface of the light guide plate can be well shielded, and white spots cannot be formed; therefore, in the production process, even if foreign matters and stains exist, the quality of the product is not affected, and the reject ratio of the product can be greatly reduced. In addition, due to the double reflection of the first concave groove 120 and the second concave groove 130, the brightness is greatly improved, the electric energy required under the same brightness requirement is smaller, and the point is saved. In the embodiment of the present invention, the first concave groove 120 and the second concave groove 130 may be formed by engraving an intaglio or an intaglio.

The technical scheme at least has the following technical effects: the first concave groove 120 is arranged on the light emitting surface 114 of the light guide plate, the second concave groove 130 and the micro-grid points 140 are arranged on the reflecting surface 116 of the light guide plate, light enters the light guide plate from the light incident surface 112, and under the action of the first concave groove 120, the second concave groove 130 and the micro-grid points 140, reflection and repeated refraction in all directions are formed, so that the light is reflected in a wider and wide range, the light utilization rate is improved, and the light transmittance is improved. Since a certain distance is provided between the light-stopping surface 118 and the light-incident surface 112, in order to make the light more uniform, the depth H of the first concave groove 120 and the depth of the second concave groove 130 are set to increase, so as to increase the refractive index of the light, and the profile of the micro-dots 140 is set to increase, so as to make the refractive index more uniform. Meanwhile, the Moire pattern phenomenon is formed on the surface of the light guide plate, so that the atomization degree of the surface is increased, a good shielding effect on foreign matters and stains on the surface of the light guide plate can be realized, and the reject ratio of products is reduced.

In some embodiments, the depth of the first concave groove 120 at the light incident surface 112 ranges from 15 microns to 80 microns, and the depth of the first concave groove 120 at the light stop surface 118 ranges from 25 microns to 150 microns. Since the substrate 110 has a certain thickness, if the depth H of the first concave groove 120 is too small, a good refraction effect cannot be achieved, and if the depth H of the first concave groove 120 is too large, the strength and reliability of the substrate 110 are affected, and the substrate is easily crushed. Therefore, the depth H of the first concave groove 120 needs to be within a certain reasonable range, and it is found that the width K of the first concave groove 120 can well take both the refraction and strength effects of the first concave groove 120 into consideration. Specifically, the depth of the first concave groove 120 at the light incident surface 112 may be 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 47.5 microns, 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, 75 microns, 80 microns, and the like. The depth of first concave groove 120 at light-blocking surface 118 may be 25 microns, 35 microns, 45 microns, 55 microns, 65 microns, 75 microns, 85 microns, 87.5 microns, 95 microns, 105 microns, 115 microns, 125 microns, 135 microns, 145 microns, 150 microns, and the like. Since the first concave groove 120 increases from the light incident surface 112 to the light-stopping surface 118, the starting depth and the ending depth of the first concave groove 120 are designed to be within a proper range, for example, the starting depth is 15 micrometers, and the ending depth is 25 micrometers; as another example, the starting depth is 47.5 microns and the ending depth is 87.5 microns; as another example, the starting depth is 80 microns and the ending depth is 150 microns. The depth H of the first concave groove 120 may be gradually and regularly increased or irregularly increased.

In some embodiments, the depth of the second concave groove 130 at the light incident surface 112 ranges from 15 microns to 80 microns, and the depth of the second concave groove 130 at the light-stopping surface 118 ranges from 25 microns to 150 microns. Since the substrate 110 has a certain thickness, if the depth of the second concave groove 130 is too small, a good refraction effect cannot be achieved, and if the depth of the second concave groove 130 is too large, the strength and reliability of the substrate 110 are affected, and the substrate is easily crushed. Therefore, the depth range of the second concave groove 130 needs to be within a certain reasonable range, and it is found that the width range of the second concave groove 130 can well satisfy both the refraction and strength effects of the second concave groove 130. Specifically, the depth of the second concave groove 130 at the light incident surface 112 may be 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 47.5 microns, 50 microns, 55 microns, 60 microns, 65 microns, 70 microns, 75 microns, 80 microns, and the like. The depth of the second concave groove 130 at the light-stopping surface 118 may be 25 microns, 35 microns, 45 microns, 55 microns, 65 microns, 75 microns, 85 microns, 87.5 microns, 95 microns, 105 microns, 115 microns, 125 microns, 135 microns, 145 microns, 150 microns, and the like. Since the second concave groove 130 increases from the light incident surface 112 to the light-stopping surface 118, the starting depth and the ending depth of the second concave groove 130 are designed to be within a proper range, for example, the starting depth is 15 micrometers, and the ending depth is 25 micrometers; as another example, the starting depth is 47.5 microns and the ending depth is 87.5 microns; as another example, the starting depth is 80 microns and the ending depth is 150 microns. The depth of the second concave groove 130 may be gradually and regularly increased or irregularly increased.

In order to make the light rays reflected and refracted more uniformly, the width K of the first concave groove 120 is set to increase from the light incident surface 112 to the light stopping surface 118 according to the distance relationship with the light source 600; and/or, the width of the second concave groove 130 is set to increase from the light incident surface 112 to the light stopping surface 118. It will be appreciated that, as shown in fig. 1, the width K of the first concave groove 120 refers to the width at the opening of the groove, i.e., the distance between adjacent transition sections. The width of the second concave groove 130 is the same, and will not be described herein.

Further, the width of the first concave groove 120 from the light incident surface 112 to the light stop surface 118 ranges from 50 micrometers to 300 micrometers; and/or the width of the second concave groove 130 from the light incident surface 112 to the light-stopping surface 118 ranges from 50 micrometers to 300 micrometers. That is, the width of the first concave groove 120 at the light incident surface 112 is 50 micrometers, the width at the light stopping surface 118 is 300 micrometers, and the width between the light incident surface 112 and the light stopping surface 118 may be gradually and regularly increased or irregularly increased. The second concave groove 130 is similar to the first concave groove, and will not be described in detail herein.

For the sake of improving the production efficiency and saving the production process, the width K of the first concave groove 120 may be constant from the light incident surface 112 to the light stopping surface 118; and/or, the width of the second concave groove 130 is set to be constant from the light incident surface 112 to the light emergent surface 118.

Further, the width K of the first concave groove 120 ranges from 50 micrometers to 300 micrometers; and/or the width of the second concave groove 130 ranges from 50 micrometers to 300 micrometers. Since the substrate 110 has a certain surface width, if the width K of the first concave groove 120 is too small, the size setting of the first concave groove 120 with respect to the depth is affected, increasing the difficulty of the manufacturing process; if the width K of the first concave groove 120 is too large, the number of the first concave grooves 120 is affected, and the function of the first concave groove 120 cannot be more sufficiently exerted. Therefore, the width K range of the first concave groove 120 needs to be within a certain reasonable range, and researches show that the width K range of the first concave groove 120 can well take the manufacturing and distribution effects of the first concave groove 120 into consideration. Specifically, the width K of the first concave groove 120 may be 50 micrometers, 100 micrometers, 150 micrometers, 175 micrometers, 200 micrometers, 250 micrometers, 300 micrometers, or the like. The second concave groove 130 is similar to the first concave groove, and will not be described in detail herein.

In order to increase the number of times of reflection and refraction of light, the first concave groove 120 and the second concave groove 130 may be distributed with a displacement. Specifically, since the light emitting surface 116114 and the reflecting surface are disposed opposite to each other, the first concave groove 120 and the second concave groove 130 are also disposed opposite to each other, light is reflected and refracted multiple times between the first concave groove 120 and the second concave groove 130, and in order to increase the number of times of light reflection and refraction, the first concave groove 120 and the second concave groove 130 may be disposed in an asymmetric manner, that is, the groove bottom of the first concave groove 120 deviates from the groove bottom of the second concave groove 130, so as to form a staggered distribution pattern. Of course, in order to ensure the generation and existence of moire, the first concave groove 120 and the second concave groove 130 may be aligned to ensure sufficient moire strength to shield foreign materials, dirt, etc. on the surface of the light guide plate.

In some embodiments, the micro grid points 140 have a maximum distance between two points in the outline that are spaced in a range of 30 microns to 150 microns. It can be understood that, if the outline of the micro-dot 140 is an irregular shape, there are two points having the largest distance in the irregular shape; if the outline of the micro-dots 140 is circular, all two dots on the same diameter are the two dots with the largest distance; if the outline of the micro-dots 140 is other regular patterns, there are also two dots with the largest distance. The above-mentioned pitch may be specifically 30 micrometers, 50 micrometers, 70 micrometers, 90 micrometers, 110 micrometers, 130 micrometers, 150 micrometers, or the like. Meanwhile, the distance also follows the requirement that the outline of the micro-dots 140 increases from the light incident surface 112 to the light stopping surface 118, that is, the distance needs to increase from the light incident surface 112 to the light stopping surface 118, and similarly, the increasing trend may gradually increase regularly or irregularly.

In order to ensure that the micro dots 140 can be disposed in the second concave grooves 130 during the manufacturing process, it is avoided that the micro dots 140 have too small profile and depth, so that the micro dots 140 cannot be formed on the walls of the second concave grooves 130, that is, similar to if the micro dots 140 are formed by imprinting, the dots in the template are suspended in the second concave grooves 130 and cannot be formed on the walls of the second concave grooves 130. Therefore, the interval between two points having the largest distance in the outline of the micro dot 140 is set to be larger than the width of the second concave groove 130. With such an arrangement, it can be ensured that the micro-grid points 140 can be formed in the second concave grooves 130, and at this time, most of the micro-grid points 140 formed in the second concave grooves 130 are incomplete.

Referring to the flowchart shown in fig. 2, an embodiment of the present invention further provides a method for manufacturing a double-sided light guide plate 100, including the following steps:

s100, covering the die with the mesh points and the first microstructure on the surface of an upper roller of a roller press.

Referring to fig. 5, in particular, a roller press 400 has upper and

lower rollers

410 and 420 symmetrically disposed. The mold 200 with the dots 220 and the first microstructures 210 is wrapped on the surface of the upper roller 410 to form the micro dots 140 and the second grooves 130. That is, the micro-dots 140 and the second concave grooves 130 are processed by a rolling process, and the mold 200 is a complementary pattern.

Referring to fig. 4, the method further includes a step of preparing a mold 200 with dots 220 and a first microstructure 210, specifically: the mold 200 with the first microstructure 210 is processed to obtain a dot by a laser dotting machine 300, so as to obtain the mold 200 with the dot 220 and the first microstructure 210. By adopting the laser dotting machine 300 to process the die 200, the dots 220 in different regular arrangements can be more easily obtained, the processing time is reduced, the production efficiency is improved, the density of the dots 220 is relatively reduced, and the production difficulty is reduced. The mold 200 is typically made of steel.

S200, the lower roller is abutted to the structural surface of the single-sided light guide plate with the second microstructure, and the upper roller rolls the smooth surface of the single-sided light guide plate with the second microstructure to form a pressed pattern on the smooth surface, so that the double-sided light guide plate is obtained.

Referring to fig. 3 and 5, in particular, the single-sided light guide plate 500 is a light guide plate with second microstructures 510, the second microstructures 510 are first concave grooves 120 in the double-sided light guide plate 100, time for preparing the first concave grooves 120 on the substrate 110 is saved, the side of the single-sided light guide plate 500 with the second microstructures 510 is called a structured side 530, the smooth side is called a smooth side 520, and the structured side 530 and the smooth side 520 are opposite. The structured surface 530 with the second microstructures 510 corresponds to the light emitting surface 116114 in the double-sided light guide plate 100, and the smooth surface 520 corresponds to the reflective surface in the double-sided light guide plate 100. Therefore, the upper roller 410 with the mold 200 is disposed on the smooth surface 520 side, the lower roller 420 is disposed on the structured surface 530 side, and the double-sided light guide plate 100 is obtained by synchronously rolling the upper roller 410 and the lower roller 420.

The above steps are adopted to prepare the double-sided light guide plate 100 with the required specification according to the structural parameters of the double-sided light guide plate 100 set in the embodiment of the present invention.

The traditional hot-pressing light guide plate is heated by a die mounting roller and then extrudes the light surface of the light guide plate to form a concave-convex shape after hot pressing, the production process is single and has high technical requirements on the production process, meanwhile, the density of the mesh points is increased, the defect is high during production, the mesh points are distributed densely, and the inspection personnel are difficult to inspect the defect. In the above steps, the structural parameters in the double-sided light guide plate 100 can be adjusted by replacing the mold 200 and the single-sided light guide plate 500, so that the replaceability is improved, the double-sided light guide plate 100 with different structural parameters can be prepared by the same process, the density of the mesh points is relatively reduced, and the production difficulty is reduced.

The technical scheme at least has the following technical effects: the double-sided light guide plate 100 with the mesh points 220 and the first microstructures 210 on one side and the second microstructures 510 on the other side can be obtained by the preparation method, so that light enters the light guide plate from the light incident surface 112, and reflection and repeated refraction in all directions are formed under the action of the first concave grooves 120, the second concave grooves 130 and the micro-grid points 140, so that the light is reflected in a wider and wide range, the light utilization rate is improved, and the light transmittance is improved. Meanwhile, the Moire pattern phenomenon is formed on the surface of the light guide plate, so that the atomization degree of the surface is increased, a good shielding effect on foreign matters and stains on the surface of the light guide plate can be realized, and the reject ratio of products is reduced.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only represent some embodiments of the present invention, and the description thereof is more 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 double-sided light guide plate, comprising:

the substrate comprises a light incident surface, a light emergent surface adjacent to the light incident surface, a reflecting surface opposite to the light emergent surface and a light stopping surface opposite to the light incident surface;

the light emergent surface is provided with a plurality of first concave grooves which are arranged along the same direction, and the depth of the first concave grooves increases from the light incident surface to the light stopping surface;

the reflecting surface is provided with a plurality of second concave grooves which are arranged along the same direction, and the depth of each second concave groove increases from the light incident surface to the light stopping surface;

the reflecting surface is also provided with a plurality of inwardly concave micro-mesh points, and the outlines of the micro-mesh points tend to increase from the light incident surface to the light stopping surface.

2. The double-sided light guide plate as claimed in claim 1, wherein the depth of the first concave groove at the light incident surface is in a range of 15 to 80 microns, and the depth of the first concave groove at the light emergent surface is in a range of 25 to 150 microns.

3. The double-sided light guide plate as claimed in claim 1, wherein the depth of the second concave groove at the light incident surface is in a range of 15 to 80 microns, and the depth of the second concave groove at the light emergent surface is in a range of 25 to 150 microns.

4. The double-sided light guide plate as claimed in claim 1, wherein the width of the first concave groove increases from the light incident surface to the light-blocking surface; and/or the width of the second concave groove increases from the light incident surface to the light stopping surface.

5. The double-sided light guide plate as claimed in claim 4, wherein the width of the first concave groove from the light incident surface to the light stop surface is in a range of 50 microns to 300 microns; and/or the width range of the second concave groove from the light incident surface to the light stop surface is 50-300 microns.

6. The double-sided light guide plate of claim 1, wherein the width of the first concave groove is constant from the light incident surface to the light-blocking surface; and/or the width of the second concave groove is unchanged from the light incident surface to the light stopping surface.

7. The double-sided light guide plate according to claim 6, wherein the width of the first concave groove ranges from 50 micrometers to 300 micrometers; and/or the width of the second concave groove ranges from 50 micrometers to 300 micrometers.

8. The double-sided light guide plate according to any one of claims 1 to 7, wherein the first concave grooves and the second concave grooves are arranged in a staggered manner.

9. The double-sided light guide plate according to claim 1, wherein a distance between two points having the largest distance in the outline of the micro-dots ranges from 30 micrometers to 150 micrometers.

10. The double-sided light guide plate of claim 9, wherein the interval between two points having the largest distance in the outline of the micro-dots is greater than the width of the second concave groove.