US 2013/0293602 A1 · STABLE DRIVING SCHEME FOR ACTIVE MATRIX DISPLAYS

Abstract

A method and system for operating a pixel array having at least one pixel circuit is provided. The method includes repeating an operation cycle defining a frame period for a pixel circuit, including at each frame period, programming the pixel circuit, driving the pixel circuit, and relaxing a stress effect on the pixel circuit, prior to a next frame period. The system includes a pixel array including a plurality of pixel circuits and a plurality of lines for operation of the plurality of pixel circuits. Each of the pixel circuits includes a light emitting device, a storage capacitor, and a drive circuit connected to the light emitting device and the storage capacitor. The system includes a drive for operating the plurality of lines to repeat an operation cycle having a frame period so that each of the operation cycle comprises a programming cycle, a driving cycle and a relaxing cycle for relaxing a stress on a pixel circuit, prior to a next frame period.

Claims10

Dependent claims

1-17. (canceled)

A method of operating a pixel array having pixel circuits arranged in rows and columns, each of the pixel circuits including a switch, a select line connected to the switch, a drive transistor coupled to a data line via the switch and to a controllable power supply line, a light emitting device coupled to the drive transistor, and a storage capacitor coupled to the drive transistor, the method comprising:

programming a first of the pixel circuits responsive to driving the select line for the first pixel circuit from a first state to a second state to select the first pixel circuit for programming, the programming including:
during a first operating cycle, adjusting the controllable power supply line for the first pixel circuit to a first voltage while applying on the data line for the first pixel circuit a second voltage of opposite polarity to that of the first voltage;
responsive to the first operating cycle, during a second operating cycle, changing the controllable power supply line to a driving voltage corresponding to a voltage used to drive the light emitting device of the first pixel circuit, the driving voltage being different from the first voltage;
and
responsive to the second operating cycle, during a programming cycle, changing the controllable power supply line for the first pixel circuit to a third voltage different from the first voltage and the driving voltage while applying at least a programming voltage on the data line for the first pixel circuit.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/909,177Filed 4 Jun 2013

Priority

CA 254409019 Apr 2006

Published

7 Nov 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

G09G 3/3258
Using an active matrix: with pixel circuitry controlling the voltage across the light-emitting element
G09G 3/3208
Semiconductive, e.g. using light-emitting diodes [LED]: organic, e.g. using organic light-emitting diodes [OLED]
G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G09G 2300/0814
Several active elements per pixel in active matrix panels: used for selection purposes, e.g. logical AND for partial update

Stable driving scheme for active matrix displays

Life of this patent

Stable driving scheme for active matrix displays

Life of this patent

Abstract

Claims10