coupled to a typical display device 104 in the illustrated embodiment drive electronics include a video driver card 108 in a computer 112 display device 104 receives signals from video driver card 108 and renders images on a screen for a viewer although a video driver card is shown any circuit used to control a display may be used including but not limited to a television dvd player or other display controlling device fig2 shows an expanded view of the active device array used in a display structure the active devices are arranged in rows and columns that define a pixel typically buslines 204 and associated first electrodes 206 are formed on a substrate layer 208 the buslines carry signals from the drive electronics and provide electrical voltages to first electrodes 206 in one embodiment the first electrode may be a gate electrode a thin film transistor heterostructure layer 212 is formed over substrate layer 208 the thin film transistor hetrostructure layer hereinafter tft layer includes several transistor components including a semiconductor layer a dielectric layer and a second and a third electrode in one embodiment the second and third electrodes may be source and drain electrodes a channel region is disposed between the second and third electrodes the channel may be of arbitrary shape but is typically formed to overlap the position of the first electrode in substrate.