| 摘要 |
PURPOSE:To easily adjust the displaying brightness, contrast ratio, visual angle, color tone, etc., of a display device, by changing the waveform of the voltage applied across a common electrode. CONSTITUTION:Display is performed by applying a scanning voltage Vscan, signal voltage Vsig, and common electrode voltage Vcom across an active- matrix liquid-crystal display which is equipped with scan wirings 2 that connect gate electrodes of TFT elements 1, signal wirings 3 that connect drain electrodes, and a liquid crystal layer 5 enclosed into the space between transparent electrodes 4 connected with a source electrode side and transparent electrodes 6 formed on a facing glass base plate. The reference frequency of an AC voltage Vcom is set by using the frequencies of selected periods t1 and t3 and the reference frequency is used as the frequency when the scanning voltage Vscan successively scans scanning lines. The waveform of the voltage applied across the liquid crystal layer becomes a waveform Vlc which is amplitude-modulated by the AC voltage Vcom. Voltages to be applied across a selected picture element and across a nonselected picture element are made different from each other in such way.
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