Transition between grayscale an dmonochrome addressing of an electrophoretic display

摘要

The present inventions relates to electrophoretic displays that are switchable between a grayscale updating mode ( 502 ) and a monochrome updating mode ( 501 ). The monochrome updating mode ( 501 ) provides for extreme pixel states only (e.g. black and white), whereas the grayscale updating mode ( 501 ) provides for intermediate grayscale pixels states as well. According to the present invention, a suitably selected transition signal ( 504 ) is applied when switching from the grayscale updating mode ( 502 ) to the monochrome updating mode ( 501 ). The transition signal ( 504 ) involves a drive pulse that serves to reduce the level of remnant DC voltage otherwise occurring in each pixel due to differences in the grayscale updating mode ( 502 ) and the monochrome updating mode ( 501 ).