CN106019460A - Light guide plate, backlight module and display device - Google Patents

Abstract

The invention discloses a light guide plate, a backlight module and a display device. The light guide plate includes a light guide plate substrate, the side surface of the light guide plate substrate is a light incident surface, and a surface of the light guide plate substrate perpendicular to the light incident surface is a light exit surface. On the surface, the light guide plate is also provided with a number of first-type dots and a number of second-type dots, and the first-type dots and the second-type dots are alternately distributed on the surface of the light guide plate substrate opposite to the light-emitting surface; or The first type of dots is set on the light-emitting surface of the light guide plate substrate, and the second type of dots is set on the surface of the light guide plate substrate opposite to the light-emitting surface; the distribution density of the second type of dots is from close to the light incident Increments towards the direction away from the incident surface. The technical solution of the present invention aims to obtain a light guide plate that can obtain a uniform surface light source and is easy to process.

Description

Light guide plate, backlight module and display device

technical field

The invention relates to the field of display technology, in particular to a light guide plate, a backlight module using the light guide plate, and a display device using the backlight module.

Background technique

With the improvement of interior decoration requirements, the thickness of various display devices is gradually becoming thinner, which requires the backlight module that provides the light source for the display device to choose the side-in type, and the light guide plate is a more important part of the side-in type backlight module. component, which is the key to obtaining a uniform area light source. Therefore, the structural design of the light guide plate is particularly important. Setting dots on the light guide plate can improve the scattering function of the light guide plate, so that the light source emitted from the light emitting surface is more uniform.

At present, the dot surface of the light guide plate is formed by printing, etching, hot pressing, laser engraving or sandblasting alone. The processing technology is complicated and the cost is high, and the resulting product has a high degree of defect. As the thickness of the display device becomes thinner, the thickness of the light guide plate also gradually decreases, and its own concealing effect becomes worse. It is easy to see the various dots of the light guide plate under the LCD screen (that is, the problem of the visibility of the dots). The network structure can no longer meet the demand.

Contents of the invention

The main purpose of the present invention is to provide a light guide plate, aiming to obtain a light guide plate that can obtain a uniform surface light source and is easy to process.

In order to achieve the above object, the present invention proposes a light guide plate, including a light guide plate substrate, the side surface of the light guide plate substrate is a light incident surface, a surface of the light guide plate substrate perpendicular to the light incident surface is a light exit surface, and the light guide plate substrate is a light incident surface. The light plate is also provided with a number of first-type dots and a number of second-type dots, and the first-type dots and the second-type dots are alternately distributed on the surface of the light guide plate substrate opposite to the light-emitting surface; or the first type The network dots are arranged on the light-emitting surface of the light guide plate substrate, and the second type of network dots are arranged on the surface opposite to the light-emitting surface of the light guide plate substrate; direction is increasing.

Preferably, the diameter of each of the first type dots is in the range of 20-200 μm.

Preferably, the distribution density range of the first type of network dots on the surface of the light guide plate substrate is 5% to 15%, and the overall distribution of the first type of network dots and the second type of network dots on the surface of the light guide plate substrate Density ranges from 10% to 60%.

Preferably, the size of each of the first type dots is smaller than the size of each of the second type of dots.

Preferably, when the first type of network dots and the second type of network dots are distributed on the surface of the light guide plate substrate opposite to the light-emitting surface, the light-emitting surface of the light guide plate substrate is provided with a plurality of microprisms arranged in parallel.

Preferably, the length extension direction of the microprisms is perpendicular to the arrangement direction of the light sources.

Preferably, when the first type of network dots are set on the light-emitting surface of the light guide plate substrate, and the second type of network dots are set on the surface of the light guide plate substrate opposite to the light-emitting surface, a plurality of the first type of network dots The sizes are the same, and a plurality of the first-type dots are evenly distributed on the light-emitting surface.

Another object of the present invention is to provide a backlight module, including a light source and a light guide plate, the light source is disposed on the side of the light guide plate, and the light guide plate is the above-mentioned light guide plate.

Another object of the present invention is to provide a display device, including a backlight module and a display panel, the display panel is located on the light emitting surface of the backlight module, and the backlight module is the above-mentioned backlight module.

The technical solution of the present invention can further reduce the distance between the dots of the light guide plate through the interlaced distribution of a number of first-type dots and a number of second-type dots, and the first-type dots can refract light between two adjacent second-type dots , displayed as continuous bright light on the display panel, avoiding the existence of a darker area between two dots, and reflected on the display panel to avoid the problem of dot visibility. The distribution density of the second type of network dots increases from the direction close to the light incident surface to the direction away from the light incident surface, so that the overall network dot density increases from the direction close to the light incident surface to the direction away from the light incident surface, so that the light far away from the light incident surface is weaker. , but the increased dots can scatter more light, so that the entire light guide plate forms a more uniform surface light source.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

1 is a schematic structural view of an embodiment of a light guide plate of the present invention;

Fig. 2 is the front view of Fig. 1;

FIG. 3 is a structural schematic diagram of another viewing angle of the light guide plate in FIG. 1;

FIG. 4 is a side view of FIG. 3 .

Explanation of reference numbers:

label name label name 10 light guide plate 13 The second type of network 11 Light guide plate substrate 112 light emitting surface 111 Light incident surface 1121 microprism 12 The first type of network

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two components or an interaction relationship between two components, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The invention provides a light guide plate, which is applied to a backlight module.

Referring to Figures 1 to 4, Figure 1 is a schematic structural view of an embodiment of the light guide plate of the present invention; Figure 2 is a front view of Figure 1; Figure 3 is a structural schematic view of another viewing angle of the light guide plate of Figure 1; side view.

Please refer to FIG. 1 and FIG. 2 , the light guide plate 10 according to an embodiment of the present invention includes a light guide plate substrate 11, the side surface of the light guide plate substrate 11 is a light incident surface 111, and a surface of the light guide plate substrate 11 perpendicular to the light incident surface 111 is The light-emitting surface 112, the light guide plate 10 is also provided with a number of first-type dots 12 and a number of second-type dots 13, the first-type dots 12 and the second-type dots 13 are alternately distributed on the surface of the light guide plate substrate 11 opposite to the light-emitting surface 112 or the first type of network point 12 is arranged on the light-emitting surface 112 of the light guide plate substrate 11, and the second type of network point 13 is arranged on the surface opposite to the light-emitting surface 112 of the light guide plate substrate 11; the distribution density of the second type of network point 13 is from near the light incident surface 111 increases toward the direction away from the light incident surface 111 . (The distribution density is the percentage of the area of dots within a certain area on the surface of the light guide plate substrate).

In the side-lit backlight module, the light guide plate 10 is generally flat, and the light source (not shown) is arranged on its side. The backlight module can be a backlight module with single-side, double-side or three-side light input. The light guide plate substrate 11 is a transparent acrylic plate (Poly methyl methacrylate, PMMA for short), which has high light transmittance. The cross-sectional shape of the first type of network dots 12 may be linear, circular or other shapes, and the cross-sectional shape of the second type of network dots 13 may also be linear, circular or other shapes. In this embodiment, the two opposite sides of the light guide plate 10 are light incident surfaces 111 , the shape of the first type of network dot 12 is circular, and the shape of the second type of network dot 13 is also circular.

The technical solution of the present invention can further reduce the distance between the dots of the light guide plate through the staggered distribution of several first-type dots 12 and second-type dots 13, and the first-type dots 12 can be adjacent to two second-type dots 13 The light is refracted between them, and it is displayed as continuous bright light on the display panel, avoiding the existence of a darker area between any two dots, and reflecting it on the display panel to avoid the problem of the dots being visible. The distribution density of the second type network dot 13 increases progressively from near the light incident surface 111 to the direction away from the light incident surface 111, so that the overall network dot density increases from near the light incident surface 111 to the direction away from the light incident surface 111, so far away from the light incident surface Although the light at the surface 111 is weaker, the added dots can scatter the light more, so that the entire light guide plate 10 forms a more uniform surface light source.

Preferably, the diameter of each first type of dot 12 is in the range of 20-200 μm.

With the ultra-thinning of the light guide plate, the size and spacing of the dots are further reduced, and the first type of dots 12 can be prepared by hot pressing, which can obtain dots with a smaller size and prevent the dots from appearing on the thinner light guide plate 10. depending on the problem. The roller for processing the first type of dots 12 can be a punch or a die, and the corresponding first type of dots 12 obtained are concave points or convex points. In order to obtain a better visual effect, taking the shape of the first-type dots 12 as a circle as an example, the diameter of each first-type dot 12 is in the range of 20-200 μm. The size of the second type of dots 13 needs to be designed according to the optical path of the light source, the size of the light guide plate 10 and the distribution of the first type of dots 12, so that the light guide plate 10 can emit uniform surface light. The second type of dots 13 can be made by laser engraving or printing. The first type of network dots 12 combined with the second type of network dots 13 whose distribution density increases from close to the light incident surface 111 to away from the light incident surface 111 can obtain light guide plates 10 with different specifications and requirements, compared to using thermocompression molding alone to process different requirements The light guide plate needs to be revised many times, and the mold in the thermoforming when producing the light guide plate 10 only needs one specification, which saves cost.

Preferably, the distribution density of the first type of network dots 12 on the surface of the light guide plate substrate 11 ranges from 5% to 15%, and the overall distribution density range of the first type of network dots 12 and the second type of network dots 13 on the surface of the light guide plate substrate 11 is 10%. ~60%.

Since the thickness of the light guide plate 10 is reduced, the number of times light propagates in the light guide plate 10 increases, and the smaller the distribution density of the first type dots 12 is, the more uniform surface light source is obtained. Since the light in the area close to the light source is strong, the light received in the area far away from the light source is the remaining light after consumption in the area close to the light source, and the light energy is proportional to the density of the dots, so the density of the first type of dots 12 should not be too large Otherwise, too much light energy will be consumed, which will cause the entire light guide plate 10 to fail to achieve uniform light emission. In this embodiment, according to the optical path and the specific size of the light guide plate 10, the distribution density range of the first type of dots 12 on the surface of the light guide plate substrate 11 is selected to be 5% to 15%, and when the distribution density of the second type of dots 13 is set, Ensure that the overall distribution density of the first type of network dots 12 and the second type of network dots 13 on the surface of the light guide plate substrate 11 ranges from 10% to 60%. At this time, the light guide plate 10 can emit light evenly. Of course, when the optical path and the specific specifications of the light guide plate 10 change, the distribution density of the first type of dots 12 can also be other values.

Referring to FIG. 1 , the size of each first type of dot 12 is smaller than the size of each second type of dot 13 .

In this embodiment, because the thickness of the light guide plate 10 is thinned, the size of the required dots is further reduced, so the size of the first type of dots 12 is set smaller, which can avoid lamp shadows (there is no light between the two light sources on the light incident side). There are shadows in the part where the light hits) and dot visibility problems. The size of the second type of network point 13 can be relatively large, according to the size of the light guide plate 10 and the specific distribution of the first type of network point 12, the distribution of the second type of network point 13 is designed, for example, when the first type of network point 12 and the second type of network point 13 are all circular, the size of the light guide plate 10 is 55 inches, the diameter of the first type of dot 12 is 50 μm, and when the distribution density is 5%, the minimum diameter of the second type of dot 13 is 410 μm, and the maximum diameter is 960 μm. The center-to-center distance between the second type of network dot 13 and its adjacent second type of network dots 13 is 1.3 mm, and the light output from the light guide plate 10 is uniform. In addition, the smaller-sized first-type dots 12 can be made by thermocompression forming, and the larger-sized second-type dots 13 can be made by printing, so that the respective advantages of hot-pressing and printing can be combined , thermoforming can produce smaller-sized dots, and the printing process can process dot distribution according to specific needs and the cost is relatively low.

Please refer to FIG. 1 and FIG. 3 in combination. When the first type of network dots 12 and the second type of network dots 13 are interlacedly distributed on the surface of the light guide plate substrate 11 opposite to the light exit surface 112, the light exit surface 112 of the light guide plate substrate 11 is provided with multiple parallel Microprisms 1121 are set.

The cross section of the microprism 1121 can be a cone, or a part of a regular polygon or a semicircle. In this embodiment, the cross section of the microprism 1121 is tapered. The light emitting surface 112 of the light guide plate substrate 11 is provided with a plurality of microprisms 1121 arranged in parallel. Through the further refraction and reflection of the microprisms 1121, the overall brightness of the module can be improved, and the problem of lamp shadows on the light incident side can be eliminated, and the Reduce light source energy to save energy. At the same time, the dense microprism 1121 structural design of the light-emitting surface 112 eliminates the visual problem of dots in the display panel, so that the visual effect is better. Of course, the light-emitting surface 112 may also include a plurality of parallel grooves.

It can be understood that when the first type of network dots 12 and the second type of network dots 13 are alternately distributed on the surface of the light guide plate substrate 11 opposite to the light output surface 112 , the light output surface 112 of the light guide plate substrate 11 can also be a smooth plane.

Referring to FIG. 3 and FIG. 4 , the length extension direction of the microprism 1121 is perpendicular to the arrangement direction of the light sources.

In this embodiment, the length direction of the plurality of microprisms 1121 arranged in parallel is perpendicular to the arrangement direction of the light source, which can make the light emitted by the light source more directional, more concentrated, and have a better visual effect.

Preferably, when the first type of network dots 12 are arranged on the light-emitting surface 112 of the light guide plate substrate 11, and the second type of network dots 13 are arranged on the surface of the light guide plate substrate 11 opposite to the light-emitting surface 112, the sizes of the plurality of first-type network dots 12 are the same , and a plurality of first-type network dots 12 are evenly distributed on the light-emitting surface 112 .

When the first type of network dots 12 and the second type of network dots 13 are distributed on the opposite surfaces of the light guide plate substrate 111, the size of the first type of network dots 12 is set to be the same, and a plurality of first type of network dots 12 are evenly distributed. , it can be cut at any position as required, so as to realize the versatility of the light guide plate 10 . At the same time, the size of the first type of dots 12 disposed on the light-emitting surface 112 is relatively small and evenly distributed, which can also avoid the problem of dot visibility. Certainly, the sizes of the plurality of first-type network dots 12 may also be different, and the distribution density of the first-type network dots 12 may be made uniform by adjusting the spacing or arranging at intervals of sizes.

Another object of the present invention is to provide a backlight module, including a light source (not shown) and a light guide plate 10 , the light source is disposed on the side of the light guide plate 10 , and the light guide plate 10 is the above-mentioned light guide plate. Since the light guide plate in the backlight module adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

Another object of the present invention is to provide a display device, including a backlight module (not shown) and a display panel (not shown), the display panel is located on the light emitting surface of the backlight module, and the backlight module is the above-mentioned backlight mod. Since the light guide plate in the backlight module of the display device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (9)

1. A light guide plate, comprising a light guide plate substrate, the side of the light guide plate substrate is a light incident surface, and a surface of the light guide plate substrate perpendicular to the light incident surface is a light exit surface, it is characterized in that the light guide plate also There are a number of first-class outlets and a number of second-class outlets, The first type of network dots and the second type of network dots are alternately distributed on the surface of the light guide plate substrate opposite to the light emitting surface; Or the first type of dots is set on the light-emitting surface of the light guide plate substrate, and the second type of dots is set on the surface of the light guide plate substrate opposite to the light-emitting surface; The distribution density of the second type of network dots increases from the direction close to the light-incident surface to away from the light-incident surface. 2 . The light guide plate according to claim 1 , wherein the diameter of each of the first type dots ranges from 20 μm to 200 μm. 3. The light guide plate according to claim 1, wherein the distribution density of the first type of dots on the surface of the light guide plate substrate is in the range of 5% to 15%, and the first type of dots and the second type of dots are The overall distribution density of the second type of network dots on the surface of the light guide plate substrate ranges from 10% to 60%. 4. The light guide plate according to any one of claims 1 to 3, wherein the size of each of the first type dots is smaller than the size of each of the second type dots. 5. The light guide plate according to claim 4, wherein when the first type of network dots and the second type of network dots are distributed on the surface of the light guide plate substrate opposite to the light-emitting surface, the light guide plate substrate The light-emitting surface is provided with a plurality of microprisms arranged in parallel. 6 . The light guide plate according to claim 5 , wherein the length extension direction of the microprisms is perpendicular to the arrangement direction of the light sources. 7. The light guide plate according to claim 4, wherein when the first type of network dots are arranged on the light emitting surface of the light guide plate substrate, the second type of network dots are arranged on the light guide plate substrate and the light emitting surface On the opposite surface, the multiple first-type dots have the same size, and the multiple first-type dots are evenly distributed on the light-emitting surface. 8. A backlight module, characterized in that it comprises a light source and a light guide plate, the light source is arranged on the side of the light guide plate, and the light guide plate is the light guide plate according to any one of claims 1-7. 9 . A display device, characterized in that it comprises a backlight module and a display panel, the display panel is located on the light emitting surface of the backlight module, and the backlight module is the backlight module according to claim 8 .