Projection display system including a collimating tapered waveguide or lens with the normal to optical axis angle increasing toward the lens center
April 21, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re28891 Display unit with half-stud, spacer, connection layer and method of manufacturing Liquid crystal display device Light source for liquid crystal display panels utilizing internally reflecting light pipes and integrating sphere Liquid crystal device having the microlenses in correspondence with the pixel electrodes Device for the modulation of the illuminating light of an electro-optic display screen Projection type liquid-crystal video display device using a fresnel lens Combination lamp and integrating sphere for efficiently coupling radiant energy from a gas discharge to a lightguide Active matrix liquid crystal liquid crystal light valve including a dielectric mirror upon a leveling layer and having fringing fields Spatial light modulator with improved aperture ratio InventorsApplicationNo. 050909 filed on 04/21/1993US Classes:349/5, Projector including liquid crystal cell (s)349/62, With integral optical element for guiding or distributing light from the light source349/95MicrolensesExaminersPrimary: Gross, Anita PellmanAttorney, Agent or FirmForeign Patent References
International ClassG02F 001/133.5Foreign Application Priority Data1992-04-24 JPAbstractThe present invention provides a lighting device including a light source; a reflecting mirror for reflecting light emitted by the light source in a determined direction; and a compensating element for receiving the light from the reflecting mirror and allowing the light to outgo in the form of parallel rays. Further, a projection type image display system including the above-mentioned lighting device and a display element for forming an image by receiving light from the lighting device is provided. According to the present invention, light can be emitted with a satisfactory degree of parallelization and an even illuminance, constant irregularity due to the photoelasticity can be degraded, and the degradation in brightness of a projected image due to a low ratio of aperture can be avoided. Thus, a uniform image with no illuminance irregularity can be projected.Other References
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