Circuit and method for driving pixel of organic...

Details Circuit and method for driving pixel of organic... Circuit and method for driving pixel of organic...

2008-02-01

2011-11-29

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S076000

Reexamination Certificate

active

08068073

ABSTRACT:
A circuit and method for driving pixels in an organic electroluminescent display that reduces the number of wirings of a compensation circuit for addressing brightness non-uniformity. The pixel driving circuit includes an organic electroluminescent device that emits light corresponding to an amount of a current being applied. A first transistor is connected to a power supply voltage and applies the current corresponding to a data voltage to the organic electroluminescent device. A first capacitor stores the data voltage, and a threshold voltage compensation unit stores a threshold voltage of the first transistor. A second transistor transmits the data voltage from a data line in response to a selection signal from an nth scan line. A switching unit electrically disconnects a second primary electrode of the first transistor from the organic electroluminescent device while the threshold voltage is stored in the threshold voltage compensation unit in response to a control signal.

REFERENCES:
patent: 6348906 (2002-02-01), Dawson et al.
patent: 7109952 (2006-09-01), Kwon
patent: 7154454 (2006-12-01), Okabe et al.
patent: 2003/0011584 (2003-01-01), Azami et al.
patent: 2003/0112208 (2003-06-01), Okabe et al.
patent: 2006/0082524 (2006-04-01), Kwon
Chinese Office action dated Jan. 5, 2007, for corresponding Chinese application with English translation.

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