Miniature projection optical engine based on three-color light source

Abstract

The invention relates to a miniature projection optical engine based on a three-color light source, which comprises a light source module, a polarization converter, a fly's-eye lens group, a light condensing and shaping lens group, a polarization beam splitter, a monolithic micro display panel and a projection lens, wherein the light source module emits three-color non-polarized light; the polarization converter is arranged on the emergent light path of the light source module and converts one three-color non-polarized light beam into two polarized light beams travelling in the same direction under the same polarization state; the polarization state is arranged on one side of the polarization converter and is used for homogenizing the received polarized light; the monolithic micro display panel is arranged on one side of the polarization beam splitter, which is not adjacent to the light condensing and shaping lens group and is used for modulating the polarized light with image information; and the projection lens is used for projecting the polarized light with image information. The optical engine omits a light merging element, and the number of the used optical elements is small; the invention has short light path, compact structure, small size, high light energy utilization efficiency and good uniformity.

Description

technical field [0001] The invention relates to projection display technology, in particular to a micro-projection optical engine based on three-color light sources. Background technique [0002] In recent years, liquid crystal projection technology has been widely used in audio-visual teaching, office, business, advertising and entertainment. With the development of science and technology and the improvement of people's living standards, liquid crystal projection technology is also developing in the direction of miniaturization, light weight and high image quality. [0003] The publication number "CN1721978" in the Chinese Invention Patent Application Publication is titled "Illumination Device and Projection Image Display Device", which discloses a projection type image display device, which includes three illumination devices, three liquid crystal display panels, and a dichroic mirror. and projection lenses. Wherein, each illuminating device includes a light source, an o...

AI Technical Summary

Problems solved by technology

However, in the projection device of this structure, each light source needs an independent optical waveguide, a condenser lens, a first fly-eye lens, a second fly-eye lens, and a convex lens to shape the light, and many optical elements are used. , need three panels, combined with light-combining elements (dichroic mirrors) to realize projection display, the efficiency is low, and the structure is complex, the optical path is long, and the size is large, which cannot meet the market's miniaturization and lightweight needs

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