The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 2003
Filed:
Oct. 09, 2001
Hideki Yamamoto, Saitama, JP;
Tetsuyuki Miyawaki, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A projection-type display device for displaying an image using a projector device emitting optical images spatially modulated by reflection-type liquid crystal panels onto a screen, wherein phase difference plates are arranged at the incidence planes of the reflection-type liquid panels so as to cancel out the retardation comprised of the retardation corresponding to one-quarter of the wavelength of the incident light due to the polarization beam splitter plus the retardations due to the dichroic mirrors of the color separating and synthesizing means, whereby it is possible to make the illumination light leaking from the polarization beam splitter to the projection lens at the black level portions extremely small and possible to prevent a reduction in the contrast due to the haze phenomenon.