Current-dependent light-emitting element drive circuit for use i

Details Current-dependent light-emitting element drive circuit for use i Current-dependent light-emitting element drive circuit for use i

1995-08-08

1998-02-03

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 76, 345 80, G09G 330

Patent

active

057149682

ABSTRACT:
In a light-emitting element drive circuit in an active matrix display device, at least one current-control transistor controls a current flowing through a light-emitting element. The current-control transistor and the light-emitting element are connected in parallel to each other. A constant current source is connected to a junction between one electrode of the light-emitting element and one electrode of the transistor through which the current 8s controlled to flow. The other electrodes of the light-emitting element and the transistor are connected to a common electrode which may be grounded via a resistor. In other configuration, it may be arranged that the light-emitting element and a capacitance are connected in parallel to each other. In this case, the current-control transistor is connected to a function between the light-emitting element and the capacitance so as to use charging and discharging operations of the capacitance for driving the light-emitting element.

REFERENCES:
patent: 4996523 (1991-02-01), Bell et al.
patent: 5095248 (1992-03-01), Sato
patent: 5235253 (1993-08-01), Sato
patent: 5302966 (1994-04-01), Stewart
Vanfleteren, et al, "Design of a Prototype Active Matrix CdSe TFT Addressed el Display", 1990, pp. 216-219.

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