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Analyzers for transmissive LCD-based projectors

A polarizer and projection technology, which is applied in the direction of using projection devices, image reproducers, instruments, polarizing elements, etc., can solve the problems of large, expensive, and limited projectors, and achieve the effect of reducing production costs and compact design

Inactive Publication Date: 2006-03-01
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this prior art approach has a limited ability to provide compact designs and short projection lens back focal lengths, which would make projectors utilizing this approach quite large and expensive

Method used

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  • Analyzers for transmissive LCD-based projectors
  • Analyzers for transmissive LCD-based projectors
  • Analyzers for transmissive LCD-based projectors

Examples

Experimental program
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Embodiment Construction

[0016] figure 1 is a schematic diagram showing the basic structure of the refractive analyzer 1 . The uniaxially oriented birefringent layer 2 is sandwiched between two transparent carrier substrates 3 . Each substrate 3 has a fine pitch "serration" structure 4 deposited on its respective inner surface. This fine-pitch "zigzag" structure 4 is preferably made of a polyimide plastic (PI) layer. The figure shows that an incident light beam 5 containing p- and s-polarized light is incident on a refractive analyzer 1 . The material properties are chosen in such a way that the first polarization mode, e.g. the p-polarized beam 6, does not observe large changes in the refractive index, so the refractive analyzer is treated as a plane-parallel plate, so the beam continues along the imaging path. However, a second polarization direction, such as s-polarized light 7, observes a large refractive index difference between materials and is refracted at the interface so that when this bea...

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PUM

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Abstract

The present invention relates to an imaging optical system for transmissive LCD projection-type video image display devices comprising analyzers (1, 10) as well as to a method for arranging such analyzers (1, 10) in such an imaging optical system. The imaging optical system comprises a light source for emitting illumination light, a transmissive liquid crystal light valve (8), a refractive analyzer device (1) arranged to pass light (6) of a first polarization mode in an imaging path and cause an angular deviation of light (7) of a second polarization mode with respect to said imaging path. The imaging system further comprises a reflective analyzer device (1) along said imaging path, and arranged to pass light (6) of the first polarization mode in said imaging path and reflect deviated light (7) of the second polarization mode out of said imaging path.

Description

technical field [0001] The present invention relates to the field of polarizers for transmissive LCD projection-type video image display devices, and more particularly to imaging optical systems for projection-type video image display devices including such polarizers, and to setting such polarizers A method in an imaging optical system of a projection type video image display device. Background technique [0002] Currently, many transmissive LCD projection-type video image display devices produce limited brightness and have a limited lifetime. One limiting factor is the use of absorbing analyzers, which require a large amount of light to be absorbed by the analyzer while filtering out unwanted polarized light. This leads in particular to undesired thermal effects which have a negative effect on the service life of the device. [0003] A prior art approach is disclosed in JP11295660, which proposes enhanced reliability against heat generated around the light valve in a tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B5/04G02B27/28H04N9/31
CPCH04N9/315G02B5/045G02B27/283G02B27/28H04N9/31
Inventor A·J·S·M·德瓦安
Owner KONINKLIJKE PHILIPS ELECTRONICS NV