Projection system

Abstract

The invention provides a projection system. The projection system comprises a light source, a space light modulator, a light recycle system and a lens assembly, wherein the light source is used for emitting light of the light source and irradiating to the space light modulator, the space light modulator is used for modulating light irradiating on the space light modulator according to an image signal to form projection light and light outside the projection light, the light recycle system is used for receiving at least one part of the light outside the projection light and guiding the at least one part of the light outside the projection light to the space light modulator, and the lens assembly is used for receiving and emitting the projection light to form a projection image. By the projection system, the light outside the projection light can be effectively utilized.

Description

technical field [0001] The present invention relates to the field of projection technology, in particular to a projection system. Background technique [0002] DLP (Digital Light Processing, digital light processing) projection technology is more and more widely used due to its advantages such as high contrast, long device life, and high fill factor. In DLP projection technology, the timing of the light source output R (red), G (green), B (blue) three-color light (or, R (red), G (green), B (blue), W (white) and more The light of various colors is projected on the DMD (Digital Micromirror Device, digital micromirror device) chip, and the DMD chip reflects the light of different colors to the projection screen to form an image after receiving the control signal of the DLP control system. [0003] The DMD chip consists of hundreds of thousands or even millions of micromirrors, and one micromirror corresponds to one pixel. There is a rotating device under each micromirror. Und...

AI Technical Summary

Problems solved by technology

[0005] During the image modulation process, the micromirror of the DMD chip in the ON state reflects the incident light to the projection lens to form projection light, and the DMD chip will also lose a considerable amount of light by the reflection of the micromirror in the OFF state, except for the projection light The light is not being used efficiently

[0006] The problem that light other than the above-mentioned projection light is not effectively used not only exists in the scene where the spatial light modulator is a digital micromirror device, but also has the same problem in projection systems using other spatial light modulators

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