Patent ID: 6661019
Filing Date: 2003-12-09
Classification: G06K,G09G

Abstract:
An active matrix circuit comprising selection lines extending along rows, signal lines extending along columns, active devices disposed at respective locations where said selection lines and said signal lines cross each other, a vertical scanning circuit for outputting selection pulse to sequentially scan said selection lines thereby selecting active device, and a horizontal scanning circuit for outputting control pulse to open or close the respective signal lines thereby inputting or outputting a signal to selected active device,wherein said vertical scanning circuit includes a transfer circuit for transferring an input start pulse from a first stage to a final stage in a stage-by-stage fashion in response to a clock signal thereby generating a selection pulse, and also includes a start pulse generating circuit which internally generates a start pulse by processing a selection pulse output from the final stage of said transfer circuit and applies the resultant start pulse to the first stage of said transfer circuit, and wherein said active matrix circuit further comprises a voltage multiplying circuit including a level shifter for stepping up the clock signal to respective stages of the transfer circuit.