Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2011-07-12
2011-07-12
Lefkowitz, Sumati (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S077000, C345S080000, C315S169300
Reexamination Certificate
active
07978156
ABSTRACT:
A pixel circuit of an organic electroluminescent display device and a method of driving the same. In the pixel circuit, a capacitor has a first electrode connected to a gate of a driving transistor, and a second electrode connected to a drain of a switching transistor. Further, a compensation voltage applying transistor is connected to the second electrode of the capacitor. The compensation voltage applying transistor compensates for a difference in IR-drops of a power supply voltage in response to a previous emission control signal. Further, the compensation voltage applying transistor cuts off the compensation voltage in an initialization period, thereby preventing a source of a data voltage and a source of the compensation voltage from being shorted with each other. Additionally, a threshold voltage compensation transistor is connected between the gate and the drain of the driving transistor. Therefore, a difference in threshold voltages of driving transistors is compensated.
REFERENCES:
patent: 6919871 (2005-07-01), Kwon
patent: 2003/0197663 (2003-10-01), Lee et al.
patent: 2004/0056828 (2004-03-01), Choi et al.
patent: 2005/0243036 (2005-11-01), Ikeda
patent: 1 465 143 (2003-11-01), None
Christie Parker & Hale LLP
Horner Jonathan
Lefkowitz Sumati
Samsung Mobile Display Co., Ltd.
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