Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-05-01
2007-05-01
Tran, Thuy Vinh (Department: 2821)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C315S169300
Reexamination Certificate
active
11208547
ABSTRACT:
A correction voltage retaining capacitor C2, a correction voltage write transistor Tr4, and a switching transistor Tr5are added to a pixel structure of an SES drive method provided with an organic EL element E1as a light emitting element, a light emission drive transistor Tr1, a data write transistor Tr2, and an erase transistor Tr3which can erase electrical charges in a light emission maintaining capacitor C1. With the ON operation of the erase transistor Tr3, the correction voltage write transistor Tr4is turned on, and the switching transistor Tr5is turned off. In this state, the threshold voltage (Vth) of the light emission drive transistor Tr1is written in the correction voltage retaining capacitor C2. When pixels are lit, by a gate-to-source voltage obtained by adding the threshold voltage written in the correction voltage retaining capacitor C2to a data voltage written in the light emission maintaining capacitor C1, drain current of the light emission drive transistor Tr1flows. Thus, among respective pixels, a lighting operation is performed in a state in which variations of light emission intensities caused by variations of threshold voltages of the light emission drive transistor Tr1are restrained.
REFERENCES:
patent: 6229506 (2001-05-01), Dawson et al.
patent: 7057588 (2006-06-01), Asano et al.
patent: 7109952 (2006-09-01), Kwon
patent: 2005/0219170 (2005-10-01), Seki
patent: 2001-343933 (2001-12-01), None
Tohoku Pioneer Corporation
Tran Thuy Vinh
Westerman, Hattori, Daniels & Adrian , LLP.
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