Patent · US Active

Transition between grayscale and monochrome addressing of an electrophoretic display

US7800580B2 · kind B2 · utility

36Cited by

4References

11Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Mark Thomas Johnson · Arendonk, BE
Guofu Zhou · Tangxia, CN
Johannes Van De Kamer · Heerlen, NL

Key dates

Filing date	Feb 24, 2005
Grant date	Sep 21, 2010
Priority date	—
Expiry date	Apr 6, 2027

Classification

Technology area (CPC G)Physics
CPC primaryG09G2340/0428
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An electrophoretic display that is switchable between a grayscale updating mode and a monochrome updating mode. The monochrome updating mode provides for extreme pixel states only including black and white, whereas the grayscale updating mode provides for an intermediate grayscale pixel state. A suitably selected transition signal is applied when switching from the grayscale updating mode to the monochrome updating mode. The transition signal 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 and the monochrome updating mode.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.