| 摘要 |
PURPOSE:To write all data signals including intermediate display signals excellently and to improve picture quality by bearing a specific relation between the gate select voltage of an insulation gate thin-film transistor (TR) and the maximum value among the data signals. CONSTITUTION:The gate select voltage of the insulation gate thin-film TR TFT and the maximum value VDMAX among the data signals have the relation VS-VDMAX>VT. Further, the relation between the gate nonselect voltage VNS and the minimum value VDMIN among the data signals is set to VNS<VDMIN-DELTAV. Here, VT is the threshold voltage of the TR TFT and DELTAT is the voltage drop value of a picture element part when the TR TFT turns off. Consequently, all data signals including half-tone display signals can be written excellently and a liquid crystal display device where pictures of good quality are formed is realized.
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