Light guide plate and extrusion roller assembly for edge-lit display backlight module

Abstract

This utility model relates to a light guide plate and extrusion roller assembly for a side-lit display backlight module, belonging to the technical field of display devices. The light guide plate includes a light guide plate body, which includes a light-incident surface, a dotted surface, and a light-emitting surface opposite to the dotted surface. The dotted surface and / or the light-emitting surface has a plurality of equally spaced V-shaped grooves. If the V-shaped grooves are formed on the dotted surface, a plurality of uniformly distributed dots are formed between adjacent V-shaped grooves. If the V-shaped grooves are formed on the light-emitting surface, a plurality of uniformly distributed microstructures are formed between adjacent V-shaped grooves. By forming a plurality of equally spaced V-shaped grooves on the dotted surface and / or the light-emitting surface, total internal reflection of light can occur within the light guide plate body, thereby improving the light convergence effect.

Description

Technical Field

[0001] This utility model relates to the field of display equipment technology, and in particular to a light guide plate and extrusion roller assembly for a side-lit display backlight module. Background Technology

[0002] The thickness of the light guide plate commonly used in the backlight module of the side-lit display is 1.5 and 2 mm. In order to make the light emitted from the light guide plate more convergent, some microstructures are usually designed on the light-emitting surface of the light guide plate (the thicker the light guide plate, the lower the depth of the microstructure on the light guide plate). With the use of related optical films, the convergence angle of the light can be improved to a certain extent (about 20-60°), but the effect is not good.

[0003] In addition, existing solutions include: selecting light guide plate thicknesses of 2mm, 3mm, and 4mm, with microstructure depths of 30μm, 20μm, and 10μm respectively, and light intake methods with either two long sides or two short sides; the LED strips are equipped with more LED groups (to increase the number of LEDs, some use an inclined arrangement of LEDs, while others use a double-layer LED arrangement + double-layer light guide plate). Although these methods can produce a certain light convergence effect, the improvement in the light convergence angle is still not good. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a light guide plate and an extrusion roller assembly for a side-lit display backlight module. The technical solution of this utility model is as follows: In a first aspect, a light guide plate for a side-lit display backlight module is provided, comprising a light guide plate body, the light guide plate body including a light incident surface, a dotted surface and a light emitting surface disposed opposite to the dotted surface, wherein a plurality of equally spaced V-shaped grooves are formed on the dotted surface and / or the light emitting surface; if the V-shaped grooves are formed on the dotted surface, a plurality of uniformly distributed dots are formed between adjacent V-shaped grooves; if the V-shaped grooves are formed on the light emitting surface, a plurality of uniformly distributed microstructures are formed between adjacent V-shaped grooves.

[0005] Preferably, the spacing between adjacent V-shaped grooves is 1-3 mm.

[0006] Preferably, when the thickness of the light guide plate body is 2.5-3mm, the depth of the V-shaped groove is 0.3-0.6mm.

[0007] Preferably, when the thickness of the light guide plate body is 3-4mm, the depth of the V-shaped groove is 0.5-0.8mm.

[0008] Preferably, the opening width of the V-shaped groove is 0.2-0.5 mm; the spacing between adjacent microstructures is 0.15-0.6 mm; the shape of the microstructure is arc-shaped; and the height is 0.03-0.15 mm.

[0009] In a second aspect, an extrusion roller assembly is provided for fabricating a light guide plate for a side-lit display backlight module as described in the first aspect, comprising a boss roller and a microstructure roller. The boss roller is provided with a number of inverted V-shaped bosses that are evenly distributed. The microstructure roller is provided with several continuously distributed inverted V-shaped microstructures.

[0010] Preferably, the spacing between adjacent inverted V-shaped bosses is 1-3mm, the angle between adjacent sides of adjacent inverted V-shaped bosses is 40-60°, and the length of the bottom side of the inverted V-shaped boss is 0.2-0.5mm.

[0011] Preferably, when the thickness of the light guide plate body is 2.5-3mm, the height of the inverted V-shaped boss is 0.3-0.6mm; when the thickness of the light guide plate body is 3-4mm, the height of the inverted V-shaped boss is 0.5-0.8mm.

[0012] Preferably, the height of the inverted V-shaped microstructure is 0.3-1.2 mm, the spacing between adjacent inverted V-shaped microstructures is 0.15-0.6 mm, and the angle between adjacent sides of adjacent inverted V-shaped microstructures is 35-50°.

[0013] All of the above optional technical solutions can be combined arbitrarily, and this utility model does not provide a detailed description of the structure after each combination.

[0014] The beneficial effects of this utility model through the above solution are as follows: By creating several equally spaced V-shaped grooves on the dot surface and / or the light-emitting surface, the light can undergo total internal reflection within the light guide plate body, thereby improving the light convergence effect. By incorporating an extrusion roller assembly, a light guide plate with V-shaped grooves can be directly manufactured during extrusion molding, reducing subsequent processing time and minimizing light guide plate warping.

[0015] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a light guide plate for a side-lit display backlight module provided by this utility model.

[0017] Figure 2 yes Figure 1 The main view.

[0018] Figure 3 This is a schematic diagram of the structure of another side-lit display backlight module provided by this utility model.

[0019] Figure 4 This is a schematic diagram of the light effect when the spacing between adjacent V-shaped grooves is different.

[0020] Figure 5 This is a schematic diagram of the extrusion roller assembly provided by this utility model.

[0021] Figure 6 This is a schematic diagram of the process of using the extrusion roller assembly provided by this utility model in the preparation of a light guide plate. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0023] like Figures 1 to 3 As shown, the light guide plate for the side-lit display backlight module provided by this utility model includes a light guide plate body, which includes a light-incident surface 11, a dotted surface 12, and a light-emitting surface opposite to the dotted surface 12. The dotted surface 12 and / or the light-emitting surface are provided with a plurality of equally spaced V-shaped grooves 14. If the dotted surface 12 is provided with the V-shaped grooves 14, then a plurality of uniformly distributed dots are provided between adjacent V-shaped grooves 14. If the light-emitting surface is provided with the V-shaped grooves 14, then a plurality of uniformly distributed microstructures 13 are provided between adjacent V-shaped grooves 14.

[0024] In this embodiment of the invention, the V-shaped groove 14 can be formed on the dot surface 12, such as... Figure 1 As shown; the V-shaped groove 14 can also be formed on the light-emitting surface; of course, the V-shaped groove 14 can also be formed on both the dot surface 12 and the light-emitting surface, such as... Figure 3 As shown.

[0025] Regarding the shape of the dots, this utility model does not impose specific limitations; a conventional dot structure can be used.

[0026] The halftone dots are created using various processes such as laser processing, hot pressing, and printing. The V-shaped grooves 14 can be engraved using a precision machining machine or processed using lasers.

[0027] In one specific embodiment, experiments have shown that the larger the spacing between adjacent V-shaped grooves 14, the more obvious the stripes appear on the backlight module, and the more optical modules are needed. Therefore, in this embodiment, the spacing between adjacent V-shaped grooves 14 is set to 1-3mm to ensure that the cost of the backlight module is reduced while increasing the light convergence angle.

[0028] In one specific embodiment, when the thickness of the light guide plate body is 2.5-3mm, the depth of the V-shaped groove 14 is 0.3-0.6mm. When the thickness of the light guide plate body is 3-4mm, the depth of the V-shaped groove 14 is 0.5-0.8mm. Specifically, tests have shown that the deeper the V-shaped groove 14, the better the light convergence effect. This embodiment selects the V-shaped groove 14 depth design with the best overall performance for light guide plate bodies of different thicknesses.

[0029] In one specific embodiment, the opening width of the V-shaped groove 14 is 0.2-0.5 mm; the spacing between adjacent microstructures 13 is 0.15-0.6 mm, and the microstructure 13 is arc-shaped with a height of 0.03-0.15 mm. Specifically, tests have shown that the narrower the opening width of the V-shaped groove 14, the better the effect. When light enters the light guide plate body, total internal reflection occurs at the V-shaped groove 14. The wider the opening width of the V-shaped groove 14, the more obvious the bright line is, and the less likely the optical film will cover it. Therefore, this utility model selects the optimal opening width of the V-shaped groove 14 as being between 0.2-0.5 mm.

[0030] Tests on the light guide plates provided in the above embodiments revealed that by combining the spacing between adjacent V-shaped grooves 14, the depth of the V-shaped grooves 14, and the opening width of the V-shaped grooves 14 provided in the above embodiments, the convergence angle of the light guide plate can reach 50-80°, resulting in better light convergence effect.

[0031] like Figure 4 As shown, Figures (a) and (b) are schematic diagrams of the light effect when the spacing between adjacent V-shaped grooves 14 is 10mm and 2mm, respectively. By comparison, it can be seen that Figure (a) shows obvious bright lines in the grooves, while Figure (b) shows more concentrated light and better light convergence effect.

[0032] In addition, experiments have shown that placing the V-shaped groove 14 on the dot surface results in better light convergence compared to placing it on the light-emitting surface.

[0033] Furthermore, since the light guide plate for the side-lit display backlight module provided in the above embodiment requires a V-shaped groove 14 to be formed on the light guide plate body, but if the V-shaped groove 14 is processed after the light guide plate has been formed, there are two drawbacks: 1. Long processing time; 2. Warping of the light guide plate is easily caused in the subsequent processing. To solve these two problems, it is considered to add the structure of the V-shaped groove 14 when extruding the light guide plate raw material. Therefore, this utility model embodiment also provides an extrusion roller assembly, which is used to prepare the light guide plate for the side-lit display backlight module described in the above embodiment, including a boss roller 21 and a microstructure roller 22; the boss roller 21 is provided with a plurality of equally spaced inverted V-shaped bosses; the microstructure roller 22 is provided with a plurality of continuously distributed inverted V-shaped microstructures, such as Figure 5 As shown.

[0034] like Figure 6 The diagram shows the usage process of the extrusion roller assembly provided by this utility model in the preparation of a light guide plate. During the extrusion production of the light guide plate described in the above embodiment, the boss roller 21 and the microstructure roller 22 are placed at positions 2 and 3 of the extrusion forming area, respectively, according to the transfer requirements. This allows V-shaped grooves 14 to be extruded on one side (dot surface) of the light guide plate body, and microstructures to be extruded on the other side (light-emitting surface).

[0035] In one specific embodiment, since the microstructure height of light guide plates of different thicknesses has different transfer rates during extrusion molding, the thicker the light guide plate, the lower the transfer rate. Therefore, the design of this embodiment first considers a solution to improve the transfer rate. The optimal design between two adjacent inverted V-shaped protrusions is as follows: the distance P between adjacent inverted V-shaped protrusions is 1-3mm; the angle D between adjacent sides of adjacent inverted V-shaped protrusions is 40-60°; and the length W of the bottom side of the inverted V-shaped protrusion is 0.2-0.5mm.

[0036] In one specific embodiment, when the thickness of the light guide plate body is 2.5-3mm, the height H of the inverted V-shaped boss is 0.3-0.6mm; when the thickness of the light guide plate body is 3-4mm, the height H of the inverted V-shaped boss is 0.5-0.8mm.

[0037] In one specific embodiment, the height H of the inverted V-shaped microstructure is 0.3-1.2 mm, the spacing P between adjacent inverted V-shaped microstructures is 0.15-0.6 mm, and the angle D between adjacent sides of adjacent inverted V-shaped microstructures is 35-50°.

[0038] In summary, the extrusion roller assembly provided by this utility model can directly produce a light guide plate with a V-shaped groove during extrusion molding, reducing the processing time of subsequent processes and reducing the occurrence of light guide plate warping.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A light guide plate for a side-lit display backlight module, characterized in that, The light guide plate includes a light-incident surface (11), a dot surface (12), and a light-emitting surface opposite to the dot surface (12). The dot surface (12) and / or the light-emitting surface are provided with a plurality of equally spaced V-shaped grooves (14). If the dot surface (12) is provided with the V-shaped grooves (14), then a plurality of uniformly distributed dots are provided between adjacent V-shaped grooves (14). If the light-emitting surface is provided with the V-shaped grooves (14), then a plurality of uniformly distributed microstructures (13) are provided between adjacent V-shaped grooves (14).

2. The light guide plate for a side-lit display backlight module according to claim 1, characterized in that, The spacing between adjacent V-shaped grooves (14) is 1-3 mm.

3. The light guide plate for a side-lit display backlight module according to claim 1, characterized in that, When the thickness of the light guide plate body is 2.5-3mm, the depth of the V-shaped groove (14) is 0.3-0.6mm.

4. The light guide plate for a side-lit display backlight module according to claim 1, characterized in that, When the thickness of the light guide plate body is 3-4mm, the depth of the V-shaped groove (14) is 0.5-0.8mm.

5. The light guide plate for a side-lit display backlight module according to claim 1, characterized in that, The opening width of the V-shaped groove (14) is 0.2-0.5mm; the spacing between adjacent microstructures (13) is 0.15-0.6mm, and the microstructure (13) is arc-shaped with a height of 0.03-0.15mm.

6. An extrusion roller assembly for manufacturing a light guide plate for a side-lit display backlight module as described in any one of claims 1 to 5, comprising a boss roller (21) and a microstructure roller (22). The boss roller (21) is provided with a number of inverted V-shaped bosses that are evenly distributed; The microstructure roller (22) is provided with several continuously distributed inverted V-shaped microstructures.

7. The extrusion roller assembly according to claim 6, characterized in that, The spacing between adjacent inverted V-shaped bosses is 1-3mm, the angle between adjacent sides of adjacent inverted V-shaped bosses is 40-60°, and the length of the bottom side of the inverted V-shaped boss is 0.2-0.5mm.

8. The extrusion roller assembly according to claim 6 or 7, characterized in that, When the thickness of the light guide plate body is 2.5-3mm, the height of the inverted V-shaped boss is 0.3-0.6mm; when the thickness of the light guide plate body is 3-4mm, the height of the inverted V-shaped boss is 0.5-0.8mm.

9. The extrusion roller assembly according to claim 6, characterized in that, The height of the inverted V-shaped microstructure is 0.3-1.2 mm, the spacing between adjacent inverted V-shaped microstructures is 0.15-0.6 mm, and the angle between adjacent sides of adjacent inverted V-shaped microstructures is 35-50°.

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