Light guide plate

A technology of light guide plate and point light source, applied in the field of light guide plate, can solve the problem of uneven brightness on the surface of surface light source, and achieve the effect of eliminating obvious bright blocks and uniform light intensity

Inactive Publication Date: 2013-12-18
SHANGHAI XIANGLONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, when it is directly bonded, the intensity of the light will be strongest in the direction of the normal viewing angle (that is, the normal direction of the light-emitting surface of the LED), so the light in the direction of the normal viewing angle of the LED must be controlled by the light-expanding structure on the light guide plate. T

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] figure 1 It is an exploded view of the light guide plate and its surrounding structures in Embodiment 1 of the present invention. Such as figure 1 As shown, the light guide plate 1 cooperates with a plurality of point light sources 2 to form a direct-type backlight module 3, and the point light sources 2 can be realized by, for example, light emitting diodes.

[0037] The light guide plate 1 includes a light incident surface 10 and a light exit surface 12 opposite to the light incident surface 10 ; The light guide plate 1 is usually made of polymethylmethacrylate (Polymethylmethacrylate, PMMA) or polystyrene (Polystyrene, PS) with a uniform thickness and transparent rectangular structure, but the material of the light guide plate 1 is not Excluding the use of other resin materials with light-transmitting properties, such as: acrylic resin (Acrylic Resin), cycloolefin polymer (COC), polycarbonate (PC) or silicone (Silicone).

[0038] A plurality of point light sources...

Embodiment 2

[0044] Figure 4 It is a cross-sectional view of the light guide plate and its surrounding structures according to Embodiment 2 of the present invention. Such as Figure 4 As shown, the light guide plate 1a is similar to the light guide plate 1 of the embodiment 1, and the same components are marked with the same symbols. It is worth noting that the difference between the two is Figure 4 The groove 18a of the light guide plate 1a shown is branched in a Y shape. The groove 18a has a tip, so that the curvature distribution of the groove 18a is discontinuous. In actual implementation, the groove 18a may also connect two sub-grooves, so that the groove 18a continuously branches in a dendritic shape, and in actual design, the depth of the branched groove may be smaller than the depth of the branched groove. The functions and relevant descriptions of the components of the light guide plate 1a are actually the same as those of the light guide plate 1 in the first embodiment, and w...

Embodiment 3

[0046] Figure 5 It is a cross-sectional view of the light guide plate and its surrounding structures according to Embodiment 3 of the present invention. Such as Figure 5 As shown, the light guide plate 1b is similar to the light guide plate 1 of the embodiment 1, and the same components are marked with the same symbols. It is worth noting that the difference between the two is Figure 5 The front side of the shown light guide plate 1 b is designed with an optical microstructure pattern (Pattern) 19 that helps to emit light.

[0047] The optical microstructure pattern 19 is designed to uniformize the uniformity of the light emitted from the light emitting surface 12 on the front of the light guide plate 1b. In order to improve the convenience of processing the light guide plate 1b, and to avoid the existence of the groove 18 and the optical microstructure pattern 19 from interfering with each other in the design freedom, the groove 18 and the optical microstructure pattern...

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PUM

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Abstract

The invention discloses a light guide plate. The light guide plate can be matched with a plurality of point light sources to form a direct type backlight module. The plurality of point light sources directly adhere to the light entering surface on the back of the light guide plate, and accordingly the light outlet surface of the front of the light guide plate forms original bright blocks. The light guide plate comprises a plurality of first light extraction structures and a plurality of second light extraction structures. The plurality of first light extraction structures are designed at the positions corresponding to the original bright blocks and coincide with the positions of the plurality of point light sources in an orthographic projection direction. The plurality of second light extraction structures are arranged around one random first light extraction structure to be used for sharing light of the original bright blocks, and extra later bright blocks are formed. The first light extraction structures and the second light extraction structures are formed by a plurality of grooves arranged in a radial mode. The light guide plate has the advantages that the later bright blocks share light of the original bright blocks, and in human vision perception, the light outlet surface of the front of the light guide plate is thought to be a uniform surface light source without abrupt bright blocks.

Description

technical field [0001] The invention relates to a light guide plate, in particular to a light guide plate used for a direct light source module. Background technique [0002] The backlight module of the traditional liquid crystal display is arranged on the back of the liquid crystal panel to provide the display light source required by the liquid crystal panel. Backlight modules can be divided into "side-lit" and "direct-lit" designs according to the position of the light source. Among them, backlight modules with "direct-lit" designs gradually use multiple light-emitting diodes as light sources to replace traditional incandescent lamps or fluorescent tube. When the light emitting diode is used as a light source, it is usually reserved for a certain spread distance, and then arranged under the liquid crystal panel to provide uniform light output from the liquid crystal panel. Therefore, the backlight module of the "direct type" design will be very thick. The structure of ...

Claims

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Application Information

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IPC IPC(8): G02B6/00
Inventor 江丰丞
Owner SHANGHAI XIANGLONG ELECTRONICS TECH
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