3D projection system based on digital micromirror device

Abstract

The present invention belongs to the projection technology field, and especially relates to a 3D projection system based on a digital micromirror device. The system comprises a processor circuit, a digital image driving circuit, a digital micromirror module and an interface circuit. The digital micromirror module includes a red light DMD (Digital Micromirror Device), a blue light DMD, a green light DMD, a LED lamp, a condensing lens, a color separation / synthesis prism and a projection lens set. The light ray emitted by the LED lamp is separated to the red light, the blue light and the green light after passing through the separation optical path of the color separation / synthesis prism, then the red light, the blue light and the green light are respectively projected to the corresponding color DMD, then reflected by the DMD and pass through the optical path of the color separation / synthesis prism to be projected through the projection lens set. The surfaces of the condensing lens and the color separation / synthesis prism have antireflection films, a 3D polarizing beam splitting assembly is arranged between the color separation / synthesis prism and the projection lens set, the 3D polarizing beam splitting assembly is configured to realize 3D projection, and the antireflection films are employed to make up the brightness loss of the polarizing beam splitting.

Description

technical field [0001] The invention belongs to the technical field of projection, in particular to a 3D projection system based on a digital micromirror. Background technique [0002] DigitalMicromirrorDevice, DMD digital micromirror is a kind of optical switch, which uses a rotating mirror to realize the opening and closing of the optical switch, and the opening and closing time is slightly longer, on the order of microseconds. The action process is very simple. The light comes out from the optical fiber and shoots to the reflector of the DMD. When the DMD is turned on, the light can enter the optical fiber at the other end through a symmetrical optical path; when the DMD is turned off, the reflector of the DMD produces a small rotation. , after the light is reflected, it cannot enter the other end of the symmetry, and the effect of turning off the optical switch is achieved. [0003] Existing projectors are usually bulky and inconvenient to carry or place. Contents of ...

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Problems solved by technology

[0003] Existing projectors are usually bulky and inconvenient to carry or place

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