Reflection type optical valve projection system

Abstract

A reflective light valve imaging system, including a prism module, which contains two outer surfaces and one side surface, and the interior has two inclined adjacent cut surfaces between the two outer surfaces; a metal wire grid polarizer is arranged on the side A tangent surface of the surface; a reflective light valve is arranged near the outer surface next to the metal wire grid polarizer; and a lens group is arranged near the other outer surface. The polarized light beam is pre-polarized by the polarizer to form the required polar light beam, so that the uniform polarized light beam enters the prism module, and then enters the metal wire grid polarizer after total reflection, and is completely reflected by the metal wire grid polarizer at various incident angles The polar light beam is irradiated to the reflective light valve, modulated by the light valve and then projected to the lens group to form an image. The invention can avoid the polarization separation loss of oblique incidence, increase the contrast of the system image, and make the spatial configuration of the imaging system more flexible.

Description

technical field [0001] The invention relates to a display system, in particular to a reflection type light valve display system using a prism module. Background technique [0002] In order to meet the requirements of the light valve for a specific polar beam, the existing imaging system forms the illumination beam into a single polar beam in advance, and then irradiates the light valve with a single polar illumination beam to improve the quality of the image. [0003] like figure 1 As shown, the prior art imaging system 10 uses a polarizing beamsplitter (PBS) as a means of polarizing the illuminating light beam. The polarizing beamsplitter 11 consists of two right-angled cylindrical prisms 111 and 112 which are mutually adhered by the hypotenuses. The junction forms a prism with a square cross section, and a polarization splitting coating 113 is provided on the surface of the bonding hypotenuse, and the polarized beam is polarized by selectively reflecting the characteristi...

AI Technical Summary

Problems solved by technology

[0004] Due to the angular dependence of the traditional polar polarizer, that is, for the beams (skew rays) incident at various oblique angles, the traditional polar polarizer will produce beams with different polarities due to different directions, resulting in some The loss of polar beam conversion, resulting in severe contrast unevenness and low contrast

Therefore, when the components of the existing imaging system 10 are configured, it will be limited by the polarization angle characteristic distribution of the polarity separation coating 113 relative to the incident illumination beam and light valve reflected light. / # larger) optical system, thus reducing the light output of the optical system

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