Novel direct type backlight module and LED light-emitting device thereof

Abstract

According to the novel direct type backlight module and the LED light-emitting device thereof, the effect of the light guide plate is truly and perfectly applied to the direct type backlight module, and the direct type backlight module is thin, good in picture display effect, simple in structure, low in process cost, capable of being controlled in a regional mode and low in repair rate; the LED light-emitting device comprises a substrate 1, a light guide plate 2, LED particles 3 and a dot layer 4; the light guide plate 2 is located above the dot layer 4, the substrate 1 is located below the dot layer 4, the LED particles 3 are fixed to the upper surface of the substrate 1, the LED particles 3 are arranged in an LED installation cavity 21 of the light guide plate 2, and the lower surface ofthe LED installation cavity 21 is flush with the lower surface of the light guide plate 2. Small reflecting layers 31 are arranged on the upper portions and the lower portions of the LED particles 3,and light is emitted from the peripheries of the LED particles 3.

Description

technical field [0001] The present invention relates to the technical field of display devices, and more specifically, to a novel direct-lit backlight module and an LED light-emitting device thereof. Background technique [0002] The backlight module of a TV or computer display device is divided into a side-type backlight module and a direct-type backlight module, wherein: the LED particles of the side-type backlight module are placed on the side of the light guide plate, and the light passes through the side of the light guide plate. Refraction, and then diffuse reflection through the dots at the bottom of the light guide plate, so that the light is evenly emitted from the direction perpendicular to the upper surface of the light guide plate. Its advantages are: 1. The thickness of the side-type backlight module is small; 2. There are few LED particles, and the repair rate is low. The disadvantages are: 1. There are few LED particles, limited by the number of LED particles...

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. There are few LED particles, limited by the number of LED particles and brightness, the larger the area of ​​the display, the more limited the use of light source brightness, and the picture effect is not very good; 2. Cannot be controlled by area

The disadvantages are: 1. The thickness of the direct-type backlight module is large, which affects the appearance and seriously affects the marketing; 2. There are many LED particles and the repair rate is high

The technical key of this new direct type backlight module lies in how to change the running direction of the light so that the light is evenly emitted from the direction perpendicular to the upper surface of the light guide plate. If the running direction of the light is not changed, the light emitted from the light guide plate is not vertical and uneven

In the prior art, there are some methods to change the running direction of light, for example: setting an inverted cone-shaped or inverted triangle cavity in the light guide plate, or setting a cone-shaped or triangular barrier wall in the adjacent area of ​​​​the LED particles , but the light emitted from the light guide plate is not uniform and not vertical. At the same time, these special-shaped bodies have poor controllability to the light, and the light guide plate emitted from the top of the cone-shaped and inverted triangular cavity will form light spots, and the picture effect is not good. Great, in addition, the structure of these backlight modules is relatively complicated, and the process cost is high

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