Pixel driving circuit system and method for...

Details Pixel driving circuit system and method for... Pixel driving circuit system and method for...

2005-01-25

2005-01-25

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C345S076000, C345S078000

Reexamination Certificate

active

06847172

ABSTRACT:
Accurate gradation display on an OLED display device is effectuated by reducing a kickback voltage based on parasitic capacitance of a switching TFT without increasing a capacitance of a capacitor which retains a voltage to be supplied to a driving TFT. A capacitor for maintaining on-and-off states of a driving TFT which drives an OLED is charged by a switching TFT. The capacitor is connected to a scan line, which drives a switching TFT located in a preceding stage in accordance with a scanning order. After being charged by the switching TFT, a reference potential on the capacitor is raised to compensate for a drop in a gate voltage of the driving TFT attributable to parasitic capacitance of the switching TFT, in accordance with a signal from the scan line.

REFERENCES:
patent: 4006383 (1977-02-01), Luo et al.
patent: 5670792 (1997-09-01), Utsugi et al.
patent: 6204610 (2001-03-01), Komiya
patent: 6633270 (2003-10-01), Hashimoto

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