Method and device for improving the grey scale resolution of a pulse width modulated image display device
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United States of America Patent
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Issued Date -
Jul 15, 2004
app pub date -
Feb 18, 2004
filing date -
Mar 14, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a method and a device for improving the grey scale resolution of a pulse width modulated image display device. The time interval available for representing an image is divided into successive weighted partial time intervals comprising partial time intervals having low weighting and partial time intervals having high weighting. If the evaluation of the luminosity of the image to be represented causes a dark image to be detected, partial time intervals having high weighting are not required and the number of partial time intervals having low weightings is increased by using additional partial time intervals having low weightings. The weightings of the additional partial time intervals are different to the weightings of the first partial time intervals having low weightings. The grey scale resolution is thereby improved for dark images.
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