Patent ID: 7804476

Claim:
A display device comprising an array of pixels, each pixel comprising a thin film transistor switching device ( 14 ) and a display element ( 16 ), the array being arranged in rows and columns, wherein each row of pixels shares a row conductor ( 10 ), which connects to the gates ( 14 a ) of the thin film transistors ( 14 ) of the pixels in the row, wherein row driver circuitry ( 30 ) provides row address signals for controlling the switching of the transistors ( 14 ) of the pixels of the row, wherein the row address signals each comprise a waveform ( 42 , 44 ) for providing an ON gate voltage and an OFF gate voltage to the drive transistor ( 14 ), wherein the device further comprises control circuitry ( 50 ) for shifting the amplitudes of the ON gate voltage and the OFF gate voltage in dependence on drive and/or environmental conditions, the control circuitry ( 50 ) maintaining a constant amplitude difference ( 39 ) between the ON gate voltage and the OFF gate voltage.