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An 800×600 pixel organic light-emitting diode-on-silicon(OLEDoS) driving circuit is proposed.The pixel cell circuit utilizes a subthreshold-voltage-scaling structure which can modulate the pixel current between 170 pA and 11.4 nA.In order to keep the voltage of the column bus at a relatively high level,the sample-and-hold circuits adopt a ping-pong operation.The driving circuit is fabricated in a commercially available 0.35μm two-poly four-metal 3.3 V mixed-signal CMOS process.The pixel cell area is 15×15μm~2 and the total chip occupies 15.5×12.3 mm~2.Experimental results show that the chip can work properly at a frame frequency of 60 Hz and has a 64 grayscale(monochrome) display.The total power consumption of the chip is about 85 mW with a 3.3 V supply voltage.
An 800 × 600 pixel organic light-emitting diode-on-silicon (OLEDoS) driving circuit is proposed. The pixel cell circuit utilizes a subthreshold-voltage-scaling structure which can modulate the pixel current between 170 pA and 11.4 nA. Order to keep the voltage of the column bus at a relatively high level, the sample-and-hold circuits adopt a ping-pong operation. The driving circuit is fabricated in a commercially available 0.35 μm two-poly four-metal 3.3 V mixed-signal CMOS the pixel cell area is 15 × 15 μm ~ 2 and the total chip occupies 15.5 × 12.3 mm ~ 2. Experimental results show that the chip can work properly at a frame frequency of 60 Hz and has a 64 grayscale (monochrome) display. The total power consumption of the chip is about 85 mW with a 3.3 V supply voltage.