LED (Light Emitting Diode) light source, backlight module and liquid crystal display device

Abstract

The invention discloses LED (Light Emitting Diode) light sources, a backlight module and a liquid crystal display device. Every LED light source comprises a housing, an LED wafer and a light adjustment layer, wherein the housing comprises a light outlet, the LED wafer is arranged in the housing, the light emitting surface of the LED wafer is towards the light outlet of the housing, and the light adjustment layer is located at the position of the light outlet of the housing; the backlight module comprises the LED light sources and a light guide plate, wherein the LED light sources are located in the same plane to form a backlight source array, the plane of the backlight source array is located under the light guide plate or the LED light sources are located on the lateral side of the light guide plate and located in the same plane, and the plane of the LED light sources is parallel to the lateral side of the light guide plate; the liquid crystal display device comprises a liquid crystal display panel and the backlight module. According to the LED light sources, the backlight module and the liquid crystal display device, the light emitting angle of the LED light sources can be effectively adjusted.

Description

technical field [0001] The invention relates to the field of optics, in particular to an LED light source, a backlight module and a liquid crystal display device. Background technique [0002] Semiconductor solid-state lighting is one of the most promising new technologies in the 21st century, and its core is high-power LED. In recent years, with the advancement of semiconductor material growth technology and device packaging technology, the luminous efficiency and reliability of high-power LED devices have been greatly improved. The application range of LED is also becoming wider and wider, among which the application of LED in lighting and display panels is very rapid. Whether it is applied to lighting or as a backlight source for a display panel, it is of great value to manufacture an LED package device with a larger luminous angle. [0003] In the prior art, the power-type LED generally determines the light-emitting angle of the LED by the cup depth of the bracket, the...

AI Technical Summary

Problems solved by technology

When the LED light source is applied to the side-emitting backlight module, it is a point light source, and the light-emitting state is fan-shaped emission. When the light-emitting angle is small, it often causes the optical defect phenomenon of "firefly" (uneven light mixing), which affects the display effect.

In addition, when applied to the backlight of a display device in a direct-lit backlight module, if the light emitting angle of the LED light source is small, it is necessary to increase the number of LED light sources in the module, which increases the product cost

[0005] see Figure 1b , because the LED light source is a line light source, when it is applied to a backlight source, it needs to be converted into a surface light source by using the light guide plate 13, but when the LED light source is placed on the side of the light guide plate, the thickness d of the light guide plate is small, and the LED light source in the light guide The light emitting angle β in the thickness direction of the light plate is too large, and the plane covered by it is far beyond the side of the light guide plate, so the light beyond the thickness of the side of the light guide plate, that is Figure 1b The light in areas A and C is wasted, and the utilization efficiency is not high

Therefore, the lighting angle of the LED light source cannot be effectively adjusted in the prior art

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