Circuit for and method of driving current-driven device

Details Circuit for and method of driving current-driven device Circuit for and method of driving current-driven device

2005-01-04

2005-01-04

Shalwala, Bipin (Department: 2673)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S076000

Reexamination Certificate

active

06839057

ABSTRACT:
Drive circuits are incorporated in an active matrix image display apparatus and drive current-driven devices such as organic EL (electroluminescent) elements. Each of the drive circuits includes a drive transistor for driving the current-driven device and an auxiliary transistor connected parallel to the drive transistor and having a current driving capability which is n times the current driving capability of the drive transistor. In a portion (accelerated period) of a selected period, a drain current flows into the auxiliary transistor and a signal current flowing through a signal line, which represents a current to flow into the current-driven device, is (n+1) times a normal value. As a result, the effect of parasitic capacitors connected to signal lines is reduced, allowing the current-driven devices to be driven with an appropriate drive current even when signal currents are very small.

REFERENCES:
patent: 6091203 (2000-07-01), Kawashima et al.
patent: 2000-138572 (2000-05-01), None
patent: WO 9965011 (1999-12-01), None

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