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EP0589179A1
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Speckle-free display system using coherent light
Assignee: Texas Instruments Inc
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Filing: 1993-07-28
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Granted: —
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Expires: 2013-07-28
Abstract
Abstract A speckle-free display system using coherent light (10,12,14) is disclosed. The light is directed through a spinning diffusing element (22) to illuminate a spatial light modulator (28). The spinning element (22) is operable to move the interference patterns around the screen (32) at speed where it is undetectable to the human eye. The diffusing element (22) is more than likely comprised of ground glass.
Inventors
- 👤 James M. Florence
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:17
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3129; G; G02; G02B; G02B27/00; G02B27/48; G02B5/00; G02B5/02; G02B5/0205; G02B5/0236; G02B5/0273; G02B5/0278
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
A speckle-free display system comprising: at least one coherent light source; a diffusing element operable to move and diffuse coherent light from the or each source through an imaging system; a spatial light modulator for receiving light from said imaging system; and a viewing surface operable to display an image created by said spatial light modulator.
Claim 2
Dependent Claim
14 words
The system as claimed in claim 1, wherein said diffusing element has no gain.
Claim 3
Dependent Claim
26 words
The system as claimed in claim 1, wherein said diffusing element has a gain such that diffuse light better fills the aperture of the imaging system.
Claim 4
Independent Claim
13 words
The system of any preceding claim wherein the diffusing element spins in use.
Claim 5
Independent Claim
25 words
The system of any preceding claim, wherein said at least one coherent light source further comprises three lasers, one red, one green and one blue.
Claim 6
Independent Claim
21 words
The system as claimed in any preceding claim, wherein said at least one coherent light source further comprises a tunable laser.
Claim 7
Independent Claim
15 words
The system as claimed in any preceding claim, wherein said diffusing element comprises ground glass.
Claim 8
Independent Claim
17 words
The system as claimed in any preceding claim, wherein said diffusing element is powered by a motor.
Claim 9
Independent Claim
20 words
The system as claimed in any of claims 1 to 7, wherein said diffusing element is powered by a coil.
Claim 10
Independent Claim
24 words
The system as claimed in any preceding claim wherein the spatial light modulator is a Deformable Mirror Device (DMD) or a Digital Micromirror Device.
References Cited (Backward Citations)
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