Active matrix circuit, method of driving the same, and surface pressure distribution detecting apparatus

摘要

An active matrix circuit having a simplified circuit configuration is disclosed. The active matrix circuit includes selection lines extending along rows, signal lines extending along columns, active devices disposed at respective locations where the selection lines and the signal lines cross each other, a vertical scanning circuit for outputting selection pulses to sequentially scan the selection lines thereby selecting active devices, and a horizontal scanning circuit for outputting control pulses to open or close the respective signal lines thereby inputting or outputting a signal to selected active devices. The 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 the transfer circuit and applies the resultant start pulse to the first stage of the transfer circuit. The clock signal may be internally generated. The start pulse supplied to the horizontal scanning circuit may be internally generated.