Electroluminescent display device

Details Electroluminescent display device Electroluminescent display device

2005-05-03

2005-05-03

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C345S076000

Reexamination Certificate

active

06888318

ABSTRACT:
An electroluminescent (EL) display device comprises an array of display pixels, each display pixel comprising an EL display element and a driving circuit. A digital pixel drive signal determines whether the pixel is on or off, and a selected one of a plurality of supply voltages is switched to the EL display element. This device enables a digital drive scheme to be implemented, but the provision of a plurality of different supply voltages enables a grey scale to be implemented without requiring time or area ratio systems to be employed. Alternatively, the device of the invention can allow time or area ratio techniques to be improved.

REFERENCES:
patent: 4528480 (1985-07-01), Unagami et al.
patent: 5952789 (1999-09-01), Stewart et al.
patent: 6188375 (2001-02-01), Kagey
patent: 6448718 (2002-09-01), Battersby
patent: 20020021293 (2002-02-01), Tam
patent: 20020033718 (2002-03-01), Tam
patent: 0717446 (1996-06-01), None
patent: WO9636959 (1996-11-01), None
patent: WO0173738 (2001-04-01), None

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