| 摘要 |
A liquid crystal display device capable of displaying halftone pictures comprises a liquid crystal display panel in which liquid crystal picture elements are provided at the intersections of the m scanning electrodes and the n signal electrodes arranged in matrix configuration so as to be selectively lit up, a first liquid crystal drive circuit for selectively applying scanning voltages to the m scanning electrodes, a second liquid crystal drive circuit for applying brightness signal voltages to the n signal electrodes, wherein the signal converting circuit for supplying the n brightness signal voltages corresponding to the n signal electrodes to the second liquid crystal drive circuit in synchronism with the scanning voltages is simplified by constructing all the component circuits, except the A/D converter, in digital fashion so that it can be easily integrated and that every signal electrode need not be provided with a brightness control circuit.
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