EP0336351B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Controlled color filter for use in information display applications
Assignee: Honeywell Inc
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Filing: 1989-04-04
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Granted: 1994-08-24
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Expires: 2009-04-04
Abstract
No abstract record available.
Inventors
- 👤 Louis D. Silverstein
- 👤 Anthony J. Bernot
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:43
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13475; G02F1/1335; G02F1/133524
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
A color filter for controlling transmission of applied light to provide a selected output color image, comprising: a) a first filter (32) including a first dye material cell (32B) having an electric field dependent absorption coefficient in a first preselected spectral range, and first electrodes positioned to apply an electric field to said first dye material; b) a second filter (34) including a second dye material cell (34B) having an electric field dependent absorption coefficient in a second preselected spectral range, and second electrodes positioned to apply an electric field to said second dye material; c) a first polarizer (31) provided at the light input side of said first dye material cell (32B), characterized by d) a second polarizer (33) provided between said first and second dye material cells (32B, 34B).
Claim 2
Dependent Claim
64 words
The color filter of claim 1, characterized by a third filter (36) including a) a third dye material cell (36B) having an electric field dependent absorption coefficient in a third preselected spectral range, and third electrodes positioned to apply an electric field to said third dye material; and b) a third polarizer (35) provided between said second and third dye material cells (34B, 36B).
Claim 3
Dependent Claim
31 words
The color filter of claim 1 or 2, characterized in that said first, second and third dye materials (32B, 34B, 36B) include a dichroic guest dye coupled to a liquid crystal.
Claim 4
Dependent Claim
49 words
The color filter of one of the preceding claims, characterized in that said color filter (30) includes a plurality of aligned sets of first, second and third dye material cells (32, 34, 36), with each set of cells controlling transmission of light in a preselected region of said filter.
Claim 5
Dependent Claim
25 words
The color filter according to one of the preceding claims, characterized in that all cell polarizers (31, 33, 35) have the same direction of polarisation.
Claim 6
Dependent Claim
33 words
An electronically controlled color display comprising a color filter according to one of the preceding claims, characterized by a broad band source (41, 42) of radiation arranged to illuminate said first polarizer (31).
Claim 7
Dependent Claim
25 words
The display of claim 6, characterized in that each of said dye material cells (32B, 34B, 36B) is a segment of a segmented color display.
Claim 8
Dependent Claim
26 words
The display of claim 6, characterized in that each of said dye material cells (32B, 34B, 36B) is a pixel (61) of a matrix color display.
Claim 9
Dependent Claim
17 words
The display of claim 8, characterized in that each pixel includes an integral thin film transistor (61).
Claim 10
Dependent Claim
30 words
The color filter or display according to one of the preceding claims, characterized in that said first, second and third dye materials include a positive anisotropic nematic or smectic material.
References Cited (Backward Citations)
No citation records indexed.
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