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US 8,224,133 B2Granted
Laser illumination device
AssigneeSBG Labs, Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern, John James Storey
Life of this patent
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Abstract
An Electrically Switchable Bragg Grating (ESBG) despeckler device comprising at least one ESBG element recorded in a hPDLC sandwiched between transparent substrates to which transparent conductive coatings have been applied. At least one of said coatings is patterned to provide a two-dimensional array of independently switchable ESBG pixels. Each ESBG pixel has a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage.
Claims25
An ESBG despeckler device comprising:
- at least one ESBG element (2;
- 2A,2B;
- 90A,90B;
- 28a,28b;
- 99a,99b;
- 3R,4R, 3G,4G, 3B,4B, 90;
- 94;
- 96;
- 84;
- 85;
- 86,87;
- 88,89;
- 851R,851G,851B;
- 86A,86B,86C,86D) wherein each said ESBG element is recorded in a Holographic Polymer Dispersed Liquid Crystal sandwiched between transparent substrates to which transparent conductive coatings (130,170;
- 171;
- 173) have been applied,
- characterized in that at least one of said coatings is patterned to provide a two-dimensional array of independently switchable ESBG pixels (21A,21B;
- 24;
- 25a,25b,25c;
- 26a,26b,26c;
- 27a,27b,27c;
- 85R,85G,85B;
- 85a;
- 88a,89a),
- wherein an electrical control circuit (3;31;
- 32) is operative to apply at least first and second voltages across each said ESBG pixel,
- wherein said ESBG element is disposed along an illumination path,
- wherein each said ESBG pixel is characterized by a first unique speckle state under said first applied voltage and a second unique speckle state under said second applied voltage,
- wherein said first and second speckle states occur during the integration time of the human eye.
26 more elements
Dependencies are inferred from the claim text.