Patent ID: 7071910
Filing Date: 2006-07-04
Classification: G02F,G09G,H01L

Abstract:
1. An operation method of an active matrix display device comprising: a substrate having an insulating surface; a first signal line extending over said substrate; a first top-gate type thin film transistor having a channel region comprising crystalline silicon formed over said substrate wherein a gate of said first thin film transistor is connected to said first signal line; a second signal line extending across said first signal line; a second top-gate type thin film transistor having a channel region comprising crystalline silicon formed over said substrate wherein a gate of said second thin film transistor is electrically connected to said second signal line through at least said first thin film transistor; a voltage supply line formed over said substrate; a pixel electrode formed over said substrate wherein said pixel electrode is connected to said voltage supply line through at least said second thin film transistor; and a driving circuit formed over said substrate for driving at least one of said first and second thin film transistors, said driving circuit comprising a third thin film transistor wherein a channel region of said third thin film transistor comprises crystalline silicon, said method comprising a step of applying a voltage from said voltage supply line to said pixel electrode for a period during one frame, wherein said period is determined in accordance with a desired tone of a display.