Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2007-02-15
2008-11-18
Osorio, Ricardo L (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S076000
Reexamination Certificate
active
07453453
ABSTRACT:
A conventional setting voltage was a value with an estimated margin of a characteristic change of a light emitting element. Therefore, a voltage between the source and drain of a driver transistor Vdshad to be set high (Vds≧Vgs−VTh+a). This caused high heat generation and power consumption because a voltage applied to the light emitting element. The invention is characterized by feedbacking a change in a current value in accordance with the deterioration of a light emitting element and a power source voltage controller which modifies a setting voltage. Namely, according to the invention, the setting voltage is to be set in the vicinity of the boundary (critical part) between a saturation region and a linear region, and a voltage margin for the deterioration is not required particularly for an initial setting voltage.
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Koyama Jun
Miyagawa Keisuke
Fish & Richardson P.C.
Osorio Ricardo L
Semiconductor Energy Laboratory Co,. Ltd.
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