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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.

Inactive Publication Date: 2005-02-16
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this approach will increase the assembly thickness W of the prism 206, increase the distance from the digital micromirror device 202 to the projection device 204, and also cause the back focus to be too long, making it difficult to design a projection lens with a wide viewing angle.

Method used

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  • Projection display optical system and its projecting method
  • Projection display optical system and its projecting method
  • Projection display optical system and its projecting method

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Embodiment Construction

[0044] image 3 For an embodiment of the present invention, a schematic diagram of a projection display optical system 10 is shown. The optical system 10 includes a light source 12 , a light guide 14 , a relay lens 16 , a prism group 18 , an optical path switching device 20 and a projection device 22 . A light collector such as an ellipsoid reflective surface 30 can be arranged around the light source 12 to converge the light emitted by the light source 12 to the light guide 14. The surrounding wall of the light guide 14 is a reflective surface, and the light is reflected by the light guide after multiple reflections on the reflective wall. The uniformly distributed light beams are emitted from the exit end, and then projected to the prism group 18 through the relay lens 16 . The optical path switching device 20 has a micro-reflector array 20a formed by a plurality of micro-reflectors. By adjusting the inclination angle of the micro-mirror mirror surface of the micro-mirror a...

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PUM

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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.

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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Application Information

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IPC IPC(8): G02B27/14G02B27/18G03B21/00
Inventor 张绍雄黄郁湘
Owner DELTA ELECTRONICS INC
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