Bistable liquid crystal display device including improved addressing means
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United States of America Patent
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Apr 1, 2008
Grant Date -
Jan 18, 2007
app pub date -
Apr 17, 2003
filing date -
Apr 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of electrically addressing a matrix screen of bistable nematic liquid crystals with breaking of anchoring is disclosed. Controlled electrical signals are applied respectively to row electrodes and to column electrodes of the screen. A plurality of rows are simultaneously addressed using similar row signals that are offset in time by a duration greater than or equal to the time column voltages that are applied. The row addressing signals have, in a first period, at least one voltage value serving to break the anchoring of all of the pixels in the row. This is followed by a second period that enables the final states of the pixels making up the address row to be determined. The final states are a function of the value of each of the electrical signals applied to the corresponding columns.
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