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Light guide plate and preparation and application thereof

A technology of light guide plate and light source, applied in the field of light guide plate and its preparation and application, can solve problems such as Hotspot phenomenon and triangular dark area of ​​light guide plate, and achieve the effect of solving Hotspot problem, increasing density, and meeting the needs of uniform light mixing

Active Publication Date: 2013-01-02
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the light guide plate of the existing side-entry internal light source has a triangular dark area, which further leads to the Hotspot phenomenon, the present invention provides a light guide plate and its preparation and application

Method used

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  • Light guide plate and preparation and application thereof
  • Light guide plate and preparation and application thereof
  • Light guide plate and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The light guide plate of this embodiment includes low-density regions and high-density regions. The low-density area uses PMMA material, the high-density area uses PC material, and the two areas use different gates. Since the material is in a liquid state during injection molding and the temperature is very high, the two materials are easily combined in a liquid state.

[0053] In this embodiment, an injection molding method is used to prepare a light guide plate.

[0054] In this embodiment, two injection molding machines are used to complete the injection molding by transferring the mould.

[0055] refer to Figure 4 , the high-density area 5 is the PC material injection molding area, and the low-density area 4 is set as the core-pulling mold.

[0056] First, inject high-density PC material into the first injection molding machine to form a semi-molded module;

[0057] Then, transfer the semi-formed module to the injection position of the second injection molding ...

Embodiment 2

[0074] The light guide plate of this embodiment includes low-density regions and high-density regions. The low-density area uses PMMA material, the high-density area uses PC material, and the two areas use different gates. Since the injection molding material is liquid and the temperature is very high, the two materials are easily combined in the liquid state.

[0075] In this embodiment, an injection molding method is used to prepare a light guide plate.

[0076] refer to Figure 4 , the high-density area 5 is the PC material injection molding area, and the low-density area 4 is set as the core-pulling mold.

[0077] First, inject high-density PC material into the injection molding machine to form a semi-molded module;

[0078] Then, the mold is rotated 180°, the core-pulling mold is drawn out, the pouring port of the low-density material PMMA is aligned with the pouring port of the PC, and PMMA is poured, thereby completing the injection molding of the semi-finished light...

Embodiment 3

[0094] Example 3: Comparison of high-density areas in different ranges for improving triangular dark areas

[0095] When the side light sources used are several independent LED light sources, by adjusting the range of the high-density area in the area between two adjacent independent LED light sources, the inventor found that when the high-density area just occupies two adjacent independent LED light sources When the triangular dark area is small, the improvement effect on the triangular dark area is the best, and there is no loss to the light efficiency of the LED.

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Abstract

The invention relates to a light guide plate which comprises a low-density region and high-density regions. The high-density regions are arranged on an incident side of the light guide plate at intervals, and when a plurality of independent point light sources are used as side light sources, each high-density region is positioned between the corresponding two adjacent independent point light sources. The invention further relates to a method for preparing the light guide plate, a backlight module comprising the light guide plate and a display device comprising the light guide plate. The light guide plate is provided with the regions with different densities, the LGP (light guide plate) density of a triangular dark region between each two adjacent point light sources is higher than densities of other portions of the light guide plate, and rays emitted by the point light sources can be refracted when penetrating into the high-density regions from the low-density region, and can be refracted towards the triangular dark regions, so that more light rays can penetrate into the triangular dark regions, the dark regions are brightened, the problem of Hotspot is solved, and the requirement on uniform light mixing on the incident side is met. Besides, the densities of the triangular dark regions are increased, and any extra loss of luminous efficiency of the point light sources is avoided.

Description

technical field [0001] The invention relates to a light guide plate and its preparation and application. Background technique [0002] The backlight module is the light source provider for liquid crystal display (Liquid Crystal Display, LCD) and other display devices. The LCD itself does not emit light, and the light guide plate (LGP) is an important part of the backlight module. The light source is converted to an area light. [0003] The raw materials of existing light guide plates mainly include PMMA (polymethyl methacrylate), PC (polycarbonate), MS (styrene-methyl methacrylate resin) and PS (polystyrene), and their physical properties are respectively For: PMMA density is about 1.15g / cm 3 , melting point is 160℃; PC is about 1.22g / cm 3 , melting point is 220℃; MS is about 1.12g / cm 3 , melting point is 160°C; PS is about 1.05g / cm 3 , with a melting point of 180°C. For the use status of the side-entry light guide plate in the prior art, please refer to figure 1 , th...

Claims

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Application Information

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IPC IPC(8): G02B6/00B29C45/00B29C45/78B29C45/77F21S8/00F21V8/00G02F1/13357
CPCG02B6/0016G02B6/0065G02B6/0018G02B6/0015
Inventor 张志丹朱红丽尹大根马青池海李友
Owner BOE TECH GRP CO LTD
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