Light mixing type monochromatic light source with function of fluorescent powder excitation and projection optical engine using same

Abstract

A light mixing type monochromatic light source with the function of fluorescent powder excitation function comprises a first pumping light source module for emerging first pumping light, a second pumping light source module for emerging second pumping light, a color combination mirror, a light filter, a fluorescent powder layer and an optical lens, wherein the light filter, the fluorescent powder layer and the optical lens are arranged in sequence. The fluorescent powder layer is used for absorbing the first pumping light and the second pumping light and exciting the fluorescent light whose wavelength is different from that of the first pumping light and that of the second pumping light. A first thin film is coated on the surface of the optical lens facing to the fluorescent powder layer and is used for transmitting the fluorescent light and reflecting the first pumping light and the second pumping light. A second thin film is coated on the surface of the light filter facing to the fluorescent powder layer and is used for transmitting the first pumping light, the second pumping light and reflecting the fluorescent light. The monochromatic light source increases the excitation energy of fluorescent powder in a manner of mixing the two pumping lights, thereby increasing the emergence brightness of the fluorescent light. Compared with the traditional large chip, the light mixing type monochromatic light source has low cost and increases the power of finally-emerged monochromatic light. In addition, the invention also provides a projection optical engine using the light mixing type monochromatic light source.

Description

technical field [0001] The invention relates to a light source and projection display technology based on phosphor powder excitation, in particular to a light-mixing monochromatic light source with phosphor powder excitation and a projection optical engine using the same. Background technique [0002] The light source is one of the most important parts of the LCD projector. Its brightness, light utilization rate and heat generation directly affect the quality of the projected image, the power consumption of the projector, the use and maintenance cost of the projector and other issues. In the past, most projectors used ultra-high pressure mercury lamps (UHP) or metal halide lamps as light sources. Although the brightness of such light sources can meet the requirements, they have high energy consumption and short life, low light conversion efficiency, and high heat generation. And it will pollute the environment, so it is not very suitable for use as a projection light source....

AI Technical Summary

Problems solved by technology

However, the larger the chip area, the higher the driving current, and the greater the heat generated, which often shortens the service life of the light source, and the output of a single chip is also limited; in addition, high-brightness, large-chip LEDs are expensive , so that the production cost of the light source is relatively high, which in turn leads to relatively high cost of liquid crystal projection, which limits the development of liquid crystal projection

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