Method of improving the luminous efficiency of a sequential-color matrix display
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United States of America Patent
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Oct 17, 2006
Grant Date -
Apr 28, 2005
app pub date -
Nov 19, 2002
filing date -
Nov 29, 2001
priority date (Note) -
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Abstract
The present invention relates to a method of improving the luminous efficiency of a sequential-colour matrix display, the display being driven using an addressing method of the pulse width modulation (PWM) type. This method comprises, for each pixel of a subframe, the following steps: comparison of the pixel colour value of the preceding subframe with a reference value so as to provide an overlap value depending on the period of overlap with the current subframe; if the pixel color value of the current subframe less the overlap value gives a positive value, a time offset is added to the pixel color value of the current subframe; if the pixel color value of the current subframe less the overlap value gives negative value, the pixel color value of the current subframe is forced to be zero. The invention applies to LCOS or LCD displays.
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