EP0329427A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Thin light blocking layers
Assignee: The General Electric Company PLC
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Filing: 1989-02-15
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Granted: —
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Expires: 2009-02-15
Abstract
Abstract An optical device, in particular a spatial light modulator, comprises a light blocking layer (5) comprising a dye which may be one or several of either food, basic, acid or solvent dyes selected for their specific wavelength absorption characteristics; for their ability to absorb light in only a very thin layer, and for their fade resistance. The dye is preferably contained in a polyimide or other plastics layer, less than 300nm thick.
Inventors
- 👤 Clare Mary Jane Powles
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 08:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; H; H10; H10F; H10F77/00; H10F77/30; H10F77/306; H10F77/331; H10F77/334; G02F1/1351
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
22 words
A spatial light modulator having a light blocking layer comprising a dye between its photoconductive input layer and its imaging output layer.
Claim 2
Dependent Claim
22 words
A spatial light modulator having a light blocking layer comprising a dye between its photoconductive input layer and its imaging output layer.
Claim 3
Dependent Claim
24 words
A spatial light modulator as claimed in claim 1, comprising a dielectric mirror layer between the light blocking layer and the imaging output layer.
Claim 4
Dependent Claim
28 words
A spatial light modulator as claimed in claim 1 or 2, in which the light blocking layer consists solely of a layer of dye coating the input layer.
Claim 5
Dependent Claim
25 words
A spatial light modulator as claimed in claim 1 or 2, in which the light blocking layer comprises a plastics coating layer containing the dye.
Claim 6
Dependent Claim
17 words
A spatial light modulator as claimed in claim 4, in which the plastics layer comprises a polyimide.
Claim 7
Dependent Claim
21 words
A spatial light modulator as claimed in any of the preceding claims, in which the light blocking layer is electrically insulating.
Claim 8
Dependent Claim
25 words
A spatial light modulator as claimed in any of the preceding claims, in which the light blocking layer is substantially planar on both its faces.
Claim 9
Dependent Claim
23 words
A spatial light modulator as claimed in any of the preceding claims, in which the light blocking layer is less than 300nm thick.
Claim 10
Dependent Claim
29 words
A spatial light modulator according to any of the preceding claims in which the light blocking layer has a visible light transmission coefficient of lower than 10⁻⁸ per metre.
Claim 11
Dependent Claim
19 words
A spatial light modulator as claimed in claim 9 in which the light blocking layer is thinner than 200nm.
Claim 12
Dependent Claim
21 words
A spatial light modulator as claimed in claim 1 to 10 in which the light blocking layer is thinner than 100nm.
Claim 13
Dependent Claim
28 words
A spatial light modulator according to claim 11, in which the light blocking layer has a visible light transmission coefficient of lower than 5 x 10⁻⁹ per metre.
Claim 14
Dependent Claim
36 words
A spatial light modulator according to any preceding claim in which the light blocking layer comprises one or more of the following dyes: Malachite Green, Fast Green FCF, Sudan Black B, Brilliant Green and Methyl Green.
References Cited (Backward Citations)
No citation records indexed.
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