Bistable nematic liquid crystal display device and method for controlling such a device
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United States of America Patent
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Jan 4, 2011
Grant Date -
Feb 2, 2006
app pub date -
Nov 24, 2003
filing date -
Nov 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a display device comprising a bistable nematic liquid-crystal matrix screen with anchoring breaking, characterized in that it comprises: components (40) capable of switching between an off state and an on state, these components being placed respectively between a drive electrode (47) associated with each pixel and a display state control link (45); and means capable of applying, to the input of each aforementioned component (40), via the state control link (45), input signals comprising at least two phases separated by a controlled time interval, namely a first phase during which the input signal has an amplitude sufficient to permit breaking of the anchoring of the liquid crystal on the associated pixel, then a second phase during which the amplitude of the input signal is controlled in order to select one of the two bistable states of the liquid crystal, the time interval between the two phases being adapted in order to break the anchoring of the liquid crystal on the said associated pixel before the second input signal phase is applied.
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