Liquid crystal display device
AssigneeKabushiki Kaisha Toshiba
InventorsHisao Fujiwara, Haruhiko Okumura
Life of this patent
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Abstract
The liquid crystal display device has at least a liquid crystal panel, a signal line driver for driving signal lines in the liquid crystal panel, and a scanning line driver for driving scanning lines. To prevent waveform distortion due to a high output impedance of the signal line driver from causing adverse effects on a displayed image, a control means is provided which causes display signals to be written to pixel electrodes in the liquid crystal panel so as to avoid amplitude variation periods of the display signals. According to a preferred embodiment, the control means consists of a display signal delay circuit, a scanning signal delay circuit, and a display timing controller that control the signal line driver and the scanning line driver.
Claims7
A liquid crystal display device comprising:
- a plurality of signal lines and a plurality of scanning lines that are arranged in lattice form;
- pixel electrodes that are arranged in matrix form at crossing portions of the signal lines and the scanning lines, a display voltage being written to each of the pixel electrodes from one of the signal lines electrically connected thereto in a display voltage writing state that is established when a corresponding one of the scanning lines is selected;
- an counter electrode that is opposed to the pixel electrodes;
- a liquid crystal layer provided between the pixel electrodes and the counter electrode;
- a signal line driver for sequentially transferring display voltages having alternate polarities to the signal lines;
- a scanning line driver for selectively driving the scanning lines to thereby allow display voltages to be written to part of the pixel electrodes corresponding to a selected scanning line;
- and
- control means for causing, when a polarity of display voltages to be supplied to a particular one of the signal lines in one field or frame is opposite to a polarity of display signals that were supplied to the same signal line in a preceding field or frame, the signal line driver to supply display voltages to pixel electrodes corresponding to a next signal line after inserting a dummy cycle having a predetermined interval.
Dependencies are inferred from the claim text.