Projection display optical system and its projecting method

An optical system and display technology, applied in optics, optical components, instruments, etc., can solve the problems of difficult to design a wide viewing angle projection lens, back focal length, increased distance, etc., to avoid stray light from entering the projection lens.
CN1580866AInactive Publication Date: 2005-02-16DELTA ELECTRONICS INC
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
DELTA ELECTRONICS INC
Publication Date
2005-02-16
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The present invention relates to a projection display optical system, including a light source, an optical circuit switching device and a prism group. the prism group is placed between the optical circuit switching device and a projection device; andon the optical circuit switching device a microreflector array formed from several microreflectors is inclued; at least two gaps are formed by said prism group, so that the light entered into the prism group can produce total reflection at the interface position of first prism and gap, then is entered into the optical circuit switching device. Said invention also provides the working principle of said optical system and projection method of said projection device.
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Description

technical field

[0001] The present invention relates to a projection display optical system, in particular to a projection display optical system design that can simultaneously improve image contrast and projection lens viewing angle. Background technique

[0002] A projection display is generally composed of an illumination system and a projection system. The lighting system is used to project the light emitted by the light source to a digital micromirror assembly device. The digital micromirror assembly device has a large number of independently controllable tiny optical adjustment components. to the display screen. Taking the Digital Micromirror Device (DMD) manufactured by Texas Instruments (TI) as an example, the tiny optical adjustment component is composed of a large number of micromirrors, and the light is transmitted through the projection system by controlling the inclination angle of the mirror surface (bright state ) or do not penetrate the projection system (d...

Claims

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