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:
Mar. 16, 1999
Filed:
Jun. 07, 1995
Yasuji Noguchi, Yokohama, JP;
Yuichiro Kimura, Yokohama, JP;
Kuninori Matsumi, Fujisawa, JP;
Kenicji Matsumoto, Fujisawa, JP;
Mitsuo Okimoto, Chigasaki, JP;
Michitaka Ohsawa, Fujisawa, JP;
Akito Takemoto, Chigasaki, JP;
Sadao Kubota, Yokohama, JP;
Kazuhiro Kaizaki, Odawara, JP;
Chiharu Ishino, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A plurality of photo detectors are arranged outside the display screen of a projection display apparatus having a built-in digital convergence correction system and a function for adjusting data in the frame memory so as to coincide the photoelectric devices of the photo detectors with the adjustment patterns is provided. The adjusted data when the convergence on the entire screen of the display is adjusted and the adjusted data when the convergence is adjusted by the adjustment function before misconvergence is generated are memorized beforehand. When misconvergence is generated, the convergence is adjusted by the adjustment function again, and a corresponding correction value is obtained on the photo detector by calculating the adjusted data at this time and the prememorized adjusted data, and a correction value on the entire screen is obtained by executing an interpolation calculation from this correction value, and the misconvergence on the entire screen is corrected.