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Reflection type optical valve projection system

A reflective and light valve technology, applied in optics, optical components, instruments, etc., can solve the problems of reducing the brightness output of the optical system, low contrast, polar beam conversion loss, etc.

Inactive Publication Date: 2004-03-03
YOUNG OPTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Reflection type optical valve projection system
  • Reflection type optical valve projection system
  • Reflection type optical valve projection system

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Embodiment Construction

[0016] see figure 2 , is the imaging system 20 of the first embodiment of the present invention, including a polarizer 21 , a prism module 22 with a wire-grid polarizer 23 (Wire-Grid Polarizer), reflective light valve 24 and lens group 25 . Mainly through the polarizer 21 and the metal wire grid polarizer 23, the illumination beam 26 is polarized into a required polarity beam, incident to the reflective light valve 24, and then reflected to the lens group 25 to form an image.

[0017] Wherein, the prism module 22 of the imaging system 20 is a columnar prism with two substantially parallel outer surfaces 221 and 222, one side surface 223 is not parallel to the outer surfaces 221 and 222, and the inside of the prism module 22 has two outer surfaces 221, 222, The tangent planes 224 and 225 of the two opposite corners of 222 are substantially parallel to each other and separated by a small gap 226, wherein on the tangent plane 224 near the outer surface 221, a metal wire grid lin...

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Abstract

An image display system with reflection-type light valve is composed of a prism module with two external surfaces, a side surface and two adjacent tanget surfaces between two external surfaces, a polarizer with metallic wire grid, a reflection-type light valve, and a lens set. When a light beam with a single polarity is irradating into said prism module and then fully reflected, polarized, offset, and projected to lens set to form an image. Its advantages are no polarization loss, and high constract.

Description

technical field [0001] The invention relates to an imaging system, in particular to a reflective light valve imaging system using a prism module. Background technique [0002] In order to meet the needs of the light valve for a specific polarity beam, the existing imaging system pre-forms the illumination beam into a single-polarity beam, and then irradiates the light valve with the single-polarity illumination beam, so as to improve the quality of the imaging image. [0003] Such as figure 1 As shown, the existing imaging system 10 uses a polarizing beam splitter 11 (polarizing beamsplitter, PBS) as a means of polarizing the illumination beam. The junction forms a square-section prism, and a polarization splitting coating 113 (polarization splitting coating) is provided on the surface of the bonded hypotenuse, and the polarization splitting coating 113 selectively reflects a specific polarity beam to polarize the beam. When mixed with P polarity (parallel to figure 1 pap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/06G02B27/18G02B27/28
Inventor 吕和
Owner YOUNG OPTICS
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