Amorphous silicon thin-film transistors-based active-matrix organic light-emitting displays for medical Imaging

We have developed three hydrogenated amorphous silicon (a-Si:H) thin-film transistors (TFTs)-based pixel electrode circuits for active-matrix organic polymer light-emitting displays (AM-OP-LEDs). Our 3- a-Si:H TFTs voltage driven pixel electrode circuits can supply a continuous output current for AM-OP-LEDs. Each pixel circuit has compensation circuits that can adjusts for the OP-LED and a-Si:H TFTs electrical characteristics shift. This pixel electrode circuit fabricated in our laboratory had the driving output current level of 1.13 muA that is equivalent to a pixel current density of over 20 mA/cm(2). The display brightness of similar to4500 cd/m(2) for green light (540 nm) can be achieved with this type of pixel electrode circuits for the organic polymer light-emitting devices having an external quantum efficiency of 5%.