Chang-Dong Kim

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We proposed the amorphous silicon thin-film transistor (a-Si:H TFT) pixel electrode circuit with current-scaling function that can be used for active-matrix organic light-emitting displays (AM-OLEDs). In contrast to the conventional current-mirror circuit, this circuit with cascaded storage capacitors can provide a high data-toOLED current ratio without(More)
—Inverted stagger hydrogenated-amorphous-silicon (a-Si:H) Corbino thin-film transistors (TFTs) were fabricated with a five-photomask process used in the processing of the active-matrix liquid-crystal displays (AM-LCD). We show that the a-Si:H Corbino TFT has the asymmetric electrical characteristics under different drain-bias conditions. To accommodate for(More)
— A novel pixel circuit for electrically stable AMOLEDs with an a-Si:H TFT backplane and top-anode organic light-emitting diode is reported. The proposed pixel circuit is composed of five a-Si:H TFTs, and it does not require any complicated drive ICs. The OLED current compensation for drive TFT threshold voltage variation has been verified using SPICE(More)
—Inverted stagger hexagonal hydrogenated amorphous silicon thin-film transistors (a-Si:H HEX-TFTs) were fabricated with a five-photomask process used in the processing of the active-matrix liquid crystal displays. We show that the output current of a-Si:H HEX-TFTs connected in parallel increases linearly with their number within a given pixel circuit.(More)
We proposed the hydrogenated amorphous silicon thin-film transistor (a-Si:H TFT) pixel electrode circuit with current-scaling function which is suitable for active-matrix organic light-emitting displays (AM-OLEDs). In contrast to the conventional current-mirror circuit, this circuit with the cascaded storage capacitors can provide a high data-to-organic(More)
This paper reports a new pixel circuit suitable for enhancing the reliability of AM-OLED with the a-Si:H TFT backplane and top-anode OLED structure. The propose pixel circuit is composed of 5 a-Si:H TFTs for switching and driving device, and it does not require any complicated drive ICs. The compensation of OLED current against threshold voltage shift of(More)
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