Projected image displaying apparatus and a method of correcting color unevenness therein
CA 2109407 C · Owner: Sharp Kabushiki Kaisha · Inventors: Fukuda, Hidenori; Hayashi, Hirokazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chromaticity meter measures the chromaticity of light output for each picture element selected. Calculated from the measurement is corrective data on each of RGB colors, which in turn is used to calculate corrective data on each of RGB for unselected picture elements. In this method original video signals for each of RGB colors will be correctively modulated based on the thus obtained corrective data. A projected image displaying apparatus is constructed such that adjustment of chromaticity as to white as well as to black from the measurement by the chromaticity meter of chromaticity throughout the entire image is carried out, uniformly and reliably by automatic control using a …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed October 27, 1993 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 27, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 27, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.