Color photosensor with color filters and subtraction unit
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United States of America Patent
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Jan 29, 2008
Grant Date -
Dec 16, 2004
app pub date -
Jul 29, 2002
filing date -
Sep 11, 2001
priority date (Note) -
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Abstract
The invention relates to a color photosensor for sensing the color contents of incident light. In order to provide a color photosensor which is cheap to produce and which allows the control of light in as well intensity as color a color photosensor is proposed comprising: a sensing unit (2) divided into four sensing areas (21, 22, 23, 24) each sensing the color content of incident light and outputting a sensing current, a filter unit (3) comprising four filter elements (31, 32, 33, 34) each being assigned and adapted to one of said sensing areas, said filter elements comprising a cyan colored filter element, a yellow colored filter element and a magenta colored filter element, and a subtraction unit (4) for separately subtracting each of the three sensing currents outputted from the three sensing areas to which one of said colored filter elements is assigned, from the forth sensing current obtaining color signals proportional to the red, green and blue content of said incident light.
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