| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize a multilevel display with not less than 256 multilevel display by conducting multilevel display employing a pure digital control only without adding analog signals. SOLUTION: The device has complementary type thin film transistors made up with P and N channel type thin film transistors. The device has a semiconductor layer, which has a channel forming region and an impurity region, a gate insulating film, which is formed on the semiconductor film, and a gate electrode which is provided through the gate insulating film. The impurity region is overlapped with the gate electrode through a gate insulating film. Pulses applied to the source or the drain of the P channel type thin film transistor have an opposite phase with respect to the pulses applied to the drain or the source of the N channel type thin film transistor.</p> |
