Backlight module, assembly method thereof and liquid crystal display using backlight module

Abstract

The invention discloses a backlight module, an assembly method thereof and a liquid crystal display using the backlight module. The backlight module at least comprises: a light guide panel; a shell which clamps the light guide panel and forms an accommodating space with the light guide panel; at least one light emitting diode light bar arranged in the accommodating space and provides at least onelight beam that enters the light guide panel. The light emitting diode light bar at least comprises a flexible circuit board and a plurality of light emitting diodes; and the flexible circuit board at least comprises a first part and at least two second parts, wherein the light emitting diodes are arranged on the first part of the flexible circuit board and the second parts are overlapped with each other. The difficulties in the assembly of the backlight module can be reduced.

Description

technical field [0001] The invention relates to a backlight module, and in particular to a backlight module with a light emitting diode light bar (LED Light Bar) and its application on a liquid crystal display (LCD). Background technique [0002] In the backlight module of a large-sized ultra-thin or high-brightness ultra-thin liquid crystal display, since the required number of light-emitting diodes is relatively large, a larger wiring space is required to arrange the running lines of all the light-emitting diodes. At present, the method of increasing the wiring space of the flexible circuit substrate of the light-emitting diode light strip is generally by increasing the width of the flexible circuit substrate, or using a flexible circuit substrate with multi-layer circuits. [0003] Please refer to figure 1 , which is a partial cross-sectional schematic diagram illustrating a traditional backlight module. The backlight module 100 a includes a reflector 102 , a light guid...

AI Technical Summary

Problems solved by technology

However, the thickness of the flexible circuit substrate 112 of the multi-layer circuit will be greatly increased, and the thermal conductivity of the insulating layer between the adjacent two-layer circuits is poor, so the light generated by the LEDs 106 on the LED light strip 114 cannot be effectively absorbed. The heat is effectively conducted, resulting in poor efficiency, shifted chromaticity, and shortened lifetime of the LED 106

In addition, the cost of the flexible circuit substrate 112 of the multilayer circuit is high, so the adoption of the flexible circuit substrate 112 will lead to a substantial increase in the cost of the backlight module 100d

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