Select line driver for a display matrix with toggling backplane
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United States of America Patent
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-
Sep 7, 1999
Grant Date -
N/A
app pub date -
Apr 12, 1996
filing date -
Apr 12, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When a given row in an array of a liquid crystal display having a toggling backplane voltage is de-selected, the row select line voltage also toggles to prevent capacitive current in the pixel capacitance. The row select line driver includes a pair of transistors coupled in a push-pull configuration. The pair of transistors are responsive to a control signal that is produced in a corresponding stage of cascaded stages of a shift register. The pair of transistors form a buffer stage that prevents the toggling voltage developed in the row select line when the row is de-selected from affecting the operation of the shift register.
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