Backlight module with diffraction optical element

Abstract

The invention discloses a negative phototropic mode of diffraction optics element, which consists of light source and diffraction optics element, wherein the diffraction optics element is set on the light source to adjust the wave front from light source, which controls the light direction and distribution through adequate phase match; the negative phototropic mode can reach the goal of light, thin, short and small by regarding the light uniformity and maximum; the diffraction optics element refracts ray without being folded geometrical shape, which simplifies the manufacturing course and reduces the cost.

Description

technical field [0001] The invention relates to a backlight module, in particular to a backlight module which uses a diffractive optical element to control the distribution and intensity of a diffused light source. Background technique [0002] Currently, it is known that the light source of a light emitting diode (LED) backlight module diffuses, mainly by adding a specially designed lens on the light emitting diode. Such as the backlight module disclosed in U.S. Patent No. 6679621B2LUMILEDS, wherein the edge-emitting light-emitting diodes in the LUMILEDS backlight module are installed on the light-emitting diodes with special optical lenses to enhance their edge-emitting uniform light mixing. Effect. However, the curved surface of the lens in this method is limited by the precision of the manufacturing process, so it is difficult to manufacture, and the thickness of the lens is also relatively thick, resulting in a substantial increase in the thickness of the backlight mod...

AI Technical Summary

Problems solved by technology

However, the curved surface of the lens in this method is limited by the precision of the manufacturing process, so it is difficult to manufacture, and the thickness of the lens is also relatively thick, resulting in a substantial increase in the thickness of the backlight module; First guide the light from the light source to the diffuser, and then spread the light evenly to the LCD panel through the diffuser

In this way, due to the lack of light transmission of the light-transmitting plate itself, and the problem of uniform diffusion must be considered at the same time, it is impossible to reduce the thickness of the overall backlight module under the multi-layer board configuration.

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