Projection system with total reflection prism

Abstract

The invention discloses a projection system with total reflection prism, which consists of light source and TIR prism structure, wherein the TIR prism structure reflects the injection light beam into the DMD part and projection lens, which realizes the projection display; the system can project the image on the display screen through rotating the microlens reflective light.

Description

technical field [0001] The invention relates to an optical device of a TV display screen, specifically a total internal reflection prism optical prism system used for a digital microreflection mirror device and a projection display system using the prism system. Background technique [0002] With the development of computer and information display technology, many new display technologies have emerged, such as DLP, LCOS, CRT, LED, etc. Not only that, as a projection display device, can its picture quality performance have high resolution and high contrast? Brand-new products with features such as high brightness, low price, etc., which are accepted by the consumer market, have become an important subject of research and development in this field. [0003] Usually, micro-mirror structure devices are used in DLP reflective projection systems. This micro-mirror structure display device is composed of many tiny mirrors. Each micro-mirror is independently controlled by CMOS, and ...

AI Technical Summary

Problems solved by technology

However, using the above-mentioned optical path structure of the traditional TIR prism structure, a folding reflector is required in the optical path to guide the light beam from the light source to the total reflection TIR prism, which will lose about 2% of the reflected light

[0006] Moreover, due to the large-angle reflector, after the reflector, it is necessary to add a lens to shape the illumination spot to meet the requirements of the DMD for the spot, but this will cause the loss of the illumination beam by about 2%.

[0007] Moreover, since the DMD is fixed on the lower surface of the TIR prism system, that is, in the direction of the short side of the trihedral prism, this will make the size of the prism larger

[0008] In summary, due to the large number of optical components in the existing optical system, the optical efficiency of the optical system is low, only reaching about 11.23%, and the large number of optical components and the large size of the TIR prism make the entire optical system volume increase, making it difficult for projection products to meet the requirements of small size, light weight, excellent performance and thinness, thus losing more potential markets

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