Driving circuit for a light-emitting element

Details Driving circuit for a light-emitting element Driving circuit for a light-emitting element

2005-06-21

2005-06-21

Tran, Henry N. (Department: 2674)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S204000

Reexamination Certificate

active

06909410

ABSTRACT:
A driving circuit for a light-emitting element, in which it is possible to exactly control a current flown in the light-emitting element, and perform a stable operation while reducing a power-supply voltage as low as possible, is provided. The driving circuit includes a current supply circuit and a driving control circuit in which, based on a current flown from a supply transistor for supplying a current for driving the light-emitting element, and information relating to a source-drain voltage of the supply transistor, it is possible to perform control so that the current approaches a desired setting current value, and the source-drain voltage of the supply transistor has the same value when setting the voltage of the gate-terminal and when driving the light-emitting element.

REFERENCES:
patent: 5502419 (1996-03-01), Kawasaki et al.
patent: 5629696 (1997-05-01), Kawasaki et al.
patent: 6661397 (2003-12-01), Mikami et al.
patent: 6750833 (2004-06-01), Kasai
patent: 6778154 (2004-08-01), Van Velzen

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