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:
Sep. 27, 2011
Filed:
Feb. 05, 2007
Hans Ku, Los Angeles, CA (US);
Jonathan Egstad, Santa Monica, CA (US);
John Hanashiro, San Francisco, CA (US);
Karl Rasche, Glendale, CA (US);
Hans Ku, Los Angeles, CA (US);
Jonathan Egstad, Santa Monica, CA (US);
John Hanashiro, San Francisco, CA (US);
Karl Rasche, Glendale, CA (US);
DreamWorks Animation LLC, Glendale, CA (US);
Abstract
In a video or other screen display apparatus, a surround to the actual screen is provided whose light output is variable in order to compensate for the effect of ambient (room) illumination on apparent contrast and chroma of the displayed image. The relationship between ambient light level and the surround illumination is an inverse power function. This provides the effect of making the viewer perceive that the entire room is brighter than it actually is, resulting in a desirable change in his perception of brightness. Thereby, the chromaticity of the surround is variable to allow a match to the calibrated white point of the video display. The apparatus includes an ambient light sensor whose output signal is provided to a control system driving the illuminated surround.