Direct-type LED backlight module

Abstract

The invention discloses a direct-type LED backlight module which comprises an LED light bar, a plurality of secondary lenses and a reflector plate, wherein the LED light bar is provided with a plurality of LEDs, and the secondary lenses are installed corresponding to the LEDs one by one. Each secondary lens comprises a bottom surface, a top, a concave part and a combined part, wherein each concave part is located at the center position, and each combined part is located below the corresponding bottom surface, and each LED is contained in the corresponding concave part. The reflector plate is attached to the LED light bar, opening holes are formed in the positions, corresponding to the secondary lenses, of the reflector plate, and the secondary lenses penetrate through the reflector plate to guide light. The secondary lenses are formed in a double injection molding mode, the bottom surface of each secondary lens is made of white and non-transparent plastic materials, and the top of each secondary lens is made of transparent plastic materials. By means of the scheme, both the white and non-transparent plastic bottom surface of each secondary lens and the reflector plate serve as a whole reflecting surface of the backlight module, namely, the reflectivity of the whole reflecting surface of the backlight module is close, meanwhile, a substrate of the LED light bar below the secondary lenses can be made to be small as much as possible, the using quantity of the substrate of the LED light bars is saved, and cost is effectively reduced.

Description

technical field [0001] The invention relates to a direct-down LED backlight module, in particular to a direct-down LED light source backlight module in which a secondary lens is applied to the backlight of a liquid crystal display. Background technique [0002] In recent years, LED (Light Emitting Diode, light-emitting diode) has been widely used in the field of lighting due to its advantages of no pollution, good color rendering, and energy saving. Gradually replaced CCFL (Cold Cathode Fluorescent Lamp, Cold Cathode Fluorescent Lamp) and became the mainstream backlight. [0003] In the direct LED backlight module of the liquid crystal display, in order to achieve better optical uniformity, the secondary lens is applied to the backlight module. Such as figure 1 Shown is a partial cross-sectional view of a direct-lit LED backlight module in the prior art, which includes an LED light bar 10 fixed on a backplane (not shown in the figure); A LED102 and a substrate 101, the su...

AI Technical Summary

Problems solved by technology

However, the cost of performing 2 operations on the secondary lens is high

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