Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Reexamination Certificate
2009-04-16
2011-11-01
Pak, Sung (Department: 2874)
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
Reexamination Certificate
active
08049825
ABSTRACT:
An imaging system (200), such as a scanned laser projection system, includes one or more laser sources (201) configured to produce one or more light beams (204), and a light modulator (203) configured to produce images (206) from the light beams (204). Optional optical alignment devices (220) can be used to orient the light beams (204) into a combined light beam (205). A birefringent wedge (221) is disposed between at least one of the laser sources (201) and the light modulator (203). The birefringent wedge (221) is configured to receive light from the laser sources (201) and deliver two angularly separated and orthogonally polarized light beams (223) to the light modulator (203) so as to reduce speckle appearing when the images (206) are displayed on a display surface (207). An optional glass wedge (1004) can be used to correct optical path deviation (1001) introduced by the birefringent wedge (221).
REFERENCES:
patent: 2008/0158513 (2008-07-01), Bartlett et al.
patent: 2009/0034041 (2009-02-01), Grasser
patent: 2009/0161072 (2009-06-01), Yamauchi et al.
patent: 2010/0079848 (2010-04-01), Grasser et al.
patent: 2011/0037953 (2011-02-01), Nizani et al.
Dingel, Benjamin et al., “Speckle-Free Image in a Laser Diode Microscope by Using the Optical Feedback Effect”,Optical Letters, vol. 18, No. 7 Apr. 1, 1993, 549-551.
Jones, R. J. et al., “Influence on External Cavity Length on the Coherence Collapse Regime in Laser Diodes Subject to Optical Feedback”,IEE Proc-Optoelectron, vol. 148, No. 1, Feb. 1, 2001, 7-12.
Trisnadi, Jahja I. et al., “Speckle Contrast Reduction in Laser Projection Displays”,SPIEvol. 4657 Apr. 26, 2002.
Volker, A.C. et al., “Laser Speckle Imaging with An Active Noise Reduction Scheme”,Optics Express, vol. 13, No. 24, Nov. 15, 2005, 9782-9787.
Woodward, S. L. et al., “The Onset of Coherence Collapse in DBR Lasers”,IEEE Photonics Technology Letters, vol. 2, No. 6 Jun. 1, 1990 , 391-394.
Duelli Markus
Freeman Mark O.
Lescure Alban N.
Microvision Inc.
Pak Sung
Wills Kevin D.
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