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:
Dec. 25, 2007
Filed:
Aug. 10, 2004
Seiji Kawaberi, Kanagawa, JP;
Seiji Kawaberi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a projection type display apparatus including a blue CRT display apparatus with low luminous efficiency and low luminous efficiency, the present invention seeks to improve contrast while suppressing the fall in brightness for red, green, and blue color as a whole. In the projection type display apparatus, the images of three colors outputted from three monochrome CRT display apparatusesR,G,B which respectively output monochromatic video signals of red, green, and blue color, are respectively projected on a screen unitvia a reflecting mirrorso as to synthesize a image of three colors and generate a color image. The brightness of the green CRT display apparatus which outputs the green image having the highest luminous efficiency is increased, while maintaining the brightness of the blue CRT display apparatusB. Further, a light absorption means for tinting to reduce the increased green brightness is provided to balance the whole brightness of red, green, and blue. Contrast is improved by the light absorption means for tinting. Preferably, the red CRT display apparatusR is treated similarly to the green CRT display apparatusG.