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Electrically controlled variable-wavelength filter and its prepearing process

A filter and wavelength technology, applied in the field of optics, can solve the problems of airflow and heat generated by the runner, affecting audio-visual effects, loud noise of the runner, etc., and achieve low power consumption, simple structure, and reliable operation

Inactive Publication Date: 2002-12-04
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many disadvantages. The wheel used will produce a lot of noise, which will affect the audio-visual effect; the wheel method is not easy to achieve synchronization of the wavelength of the illumination light and the wavelength of the image light; the wheel will generate airflow and heat, which will affect the image quality.

Method used

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  • Electrically controlled variable-wavelength filter and its prepearing process
  • Electrically controlled variable-wavelength filter and its prepearing process
  • Electrically controlled variable-wavelength filter and its prepearing process

Examples

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Effect test

specific Embodiment approach

[0020] In order to better understand the technical solutions of the present invention, further description will be given below with reference to the drawings and specific embodiments.

[0021] figure 1 It is a schematic diagram of the basic structure of the liquid crystal grating element of the present invention.

[0022] As shown in the figure, the liquid crystal grating element of the variable wavelength filter of the present invention is composed of two glass substrates 3 and a liquid crystal layer 2 between the glass substrates. The glass substrates 3 are respectively plated with a transparent conductive film 1, a liquid crystal layer 2 It is composed of a mixture of 5-10 micron high molecular polymer dispersed liquid crystal and adding appropriate additives.

[0023] figure 2 It is a schematic diagram of red light being diffracted in the grating group of the present invention.

[0024] As shown in the figure, the filter of the present invention is composed of three liquid...

Embodiment 1

[0033] 1. Prepare liquid crystal grating element, pour 8 micron thick polymer dispersed liquid crystal material into conductive glass substrate, its chemical composition is

[0034] High molecular polymer 38%

[0035] Super twisted LCD 59%

[0036] Phenylglycine 1%

[0037] Vinyl 1-viayl 1%

[0038] 2-pyrrolidinone 1%

[0039] 2. Use a helium-cadmium laser as the light source with a wavelength of λ=441nm, make the two plane wave lasers form an angle of 30°, record the grating on the liquid crystal layer, make the first liquid crystal grating element, and then change the two laser beams separately The included angles are 25° and 33.5° to form the second and third liquid crystal grating elements.

[0040] 3. Superimpose the above three liquid crystal gratings together to form an electronically controlled variable wavelength filter.

Embodiment 2

[0041] Example 2: Prepare a liquid crystal grating element, pour a 10 micron thick polymer dispersed liquid crystal material into a conductive glass substrate, the chemical composition of which is

[0042] High molecular polymer 59%

[0043] Super twisted LCD 38%

[0044] Phenylglycine 1%

[0045] Vinyl 1-viayl 1%

[0046] 2-pyrrolidinone 1%

[0047] Use the same method as the above steps 2 and 3 to make an electronically controlled variable wavelength filter.

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Abstract

The invention relates to the electric controlled variable wavelength filter and its preparing method. The filter includes the grating set that consists of three superposed liquid crystal grating components with three different spatial resolutions. The admixture of the high polymer diffusive liquid crystal with the additive being added to constitutes the liquid crystal layer between two pieces of glass substrate of the liquid crystal grating components. Building the plane wave interference on the liquid crystal layer by using the laser holographic method forms the diffraction grating, producing the liquid crystal components with different spatial resolutions. Superposing liquid crystal grating components with three different spatial resolutions by using the method of the optical coupling makes the variable wavelength filter.

Description

Technical field: [0001] The invention relates to an electronically controlled variable wavelength filter for a color projector and a preparation method thereof, and belongs to the optical technology field. Background technique: [0002] At present, color projectors, including front projection and rear projection TFT liquid crystal projectors, LCOS projectors and DLP projectors, use single-chip or dual-chip liquid crystal (or LCOS, DMD) chips to achieve color by time modulation display. In this way, the illumination wavelength is synchronized with the corresponding wavelength component in the image. The currently used method is to use a rotating wheel to filter the illuminating light source with filters of three primary colors (R, G, B), so that R, G, and B sequentially illuminate the image chip. This method has many shortcomings. The wheel used will generate a lot of noise and affect the audiovisual effect; the wheel method is not easy to achieve the synchronization of the wavele...

Claims

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Application Information

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IPC IPC(8): C09K19/00G02B27/18G02F1/1333G02F1/23
Inventor 庄松林黄维实窦晓鸣
Owner SHANGHAI JIAO TONG UNIV
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