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

1999-04-15

2000-01-04

Shalwala, Bipin H.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 76, 345 80, 345 90, G09G 330

Patent

active

060115297

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 junction 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.

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Vanfleteron, et al., "Design of a Prototype active Matrix CdSe TFT Address El Display", 1990, pp. 216-219.

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