Projection type display apparatus
August 16, 2019. 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 ReferencesOptical block for high brightness full color video projection system Full-color projector system with a tricolor-separating prism Image projection arrangement Dichroic optical elements for use in a projection type display apparatus Projection-type liquid crystal display apparatus Polarizer and light valve image projector having the polarizer Polarization beam splitter and projection display apparatus Projection display system including a collimating tapered waveguide or lens with the normal to optical axis angle increasing toward the lens center Liquid crystal light valve projector with improved contrast ratio and with 0.27 wavelength compensation for birefringence in the liquid crystal light valve Liquid crystal display projector InventorsAssigneeApplicationNo. 374993 filed on 08/16/1999US Classes:353/31, Multicolor picture349/9, Having light separated into S and P polarization353/20, POLARIZER OR INTERFERENCE FILTER359/488With particular mediumExaminersPrimary: Dowling, William C.Attorney, Agent or FirmForeign Patent References
International ClassG03B 021/14Foreign Application Priority Data1995-03-06 JPAbstractThe projection type display apparatus according to the present invention has a prism for separating incident light into a plurality of light components and combining the plurality of modulated color components. The prism is constituted by a plurality of prism assemblies, each including an optical member made of an optically transparent material having a photoelastic constant whose absolute value is not greater than +1.5×10-8 cm2 /N with respect to the incident light. More preferably, these plurality of prism assemblies are arranged such that each of a plurality of the separated color components is totally reflected by any of the prism assemblies.Field of SearchPOLARIZER OR INTERFERENCE FILTERMulticolor picture Prism Plural projection paths with single light source Reflector between lamp and screen PRISM IN LIGHT PATH Plural light path projectors Having light separated into S and P polarization By refraction at beam splitting or combining surface Including prismatic element With particular medium For beam deflection or splitting Prisms With particular material or mounting structure PRISM (INCLUDING MOUNT) Plural reflecting surfaces | |
