Data driver circuit of liquid crystal display for achieving digital gray-scale
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United States of America Patent
Stats
-
Mar 23, 1993
Grant Date -
N/A
app pub date -
Sep 27, 1991
filing date -
Sep 28, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A data driver circuit of TFT-LCD having a plurality of power source voltage terminals with different voltage levels, an output terminal for providing a voltage to the TFT-LCD, a plurality of analog switches with load resistances provided between one of the source voltage terminals and the output terminal and having a switching terminal, and a voltage selection circuit for transmitting an ON signal to a selected one or more of the respective switching terminals of the analog switches. When an individual analog switch is turned ON, the corresponding source voltage value is supplied to the output terminal of the driver circuit and when two or more analog switches are selectively turned on, a combination of the voltage levels of the respective source voltage is associated with those switches which are turned ON is produced as the driver circuit output voltage, thereby affording a greater number of gray levels as the driver circuit output voltage levels than the number of power source voltage levels.
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