Drive methods and drive devices for active type light...

Details Drive methods and drive devices for active type light... Drive methods and drive devices for active type light...

2007-03-20

2007-03-20

Osorio, Ricardo (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S078000

Reexamination Certificate

active

10699704

ABSTRACT:
In a drive device for an active type light emitting display panel which can apply a reverse bias voltage to an EL element, in order to be able to compensate deterioration in light-emitting efficiency of the EL element accompanied by applying of the reverse bias voltage and the like, one pixel10is composed of a controlling TFT (Tr1), the driving TFT (Tr2), a capacitor C1,and the EL element E1.Switching switches SW1,SW2mutually enables a supplying state of a forward current to the EL element E1and an applying state of the reverse bias voltage to be selected. In one control form according to the present invention, when the applying state of the reverse bias voltage shifts to the supplying state of the forward current, by switching one switch first, the anode and cathode of the EL element E1are made to the same electrical potential to allow electrical charges to be discharged. Thus, charge of the forward current for a parasitic capacitance of the EL element E1can be performed rapidly, and rising of the lighting operation of the EL element can be advanced.

REFERENCES:
patent: 6580657 (2003-06-01), Sanford et al.
patent: 6714177 (2004-03-01), Ishizuka
patent: 6995737 (2006-02-01), LeChevalier
patent: 7119768 (2006-10-01), Yazawa et al.
patent: 9-232074 (1997-09-01), None
patent: 2002-169510 (2002-06-01), None

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