Granted Patent B2

US 8,284,131 · App. 12/349,944 · Granted Oct 9, 2012

Abstract

Claims (32)

1. A self-luminous display device comprising:

pixel circuits; and

a drive signal generating circuit, wherein

each of the pixel circuits includes a light-emitting diode, a drive transistor connected to a drive current path of the light-emitting diode, and a holding capacitor coupled to a control node of the drive transistor,

each of the pixel circuits biases the light-emitting diode so as to emit light after correcting the voltage held by the holding capacitor with the light-emitting diode reverse-biased so as not to emit light based on a drive signal input, and

the drive signal generating circuit generates the drive signal containing a second level signal adapted to stop the light emission without reverse-biasing the light-emitting diode, a first level signal, lower than the second level signal, adapted to reverse-bias the light-emitting diode, and a third level signal, higher than the second level signal, adapted to enable the light-emitting diode to emit light, the drive signal generating circuit supplying the drive signal to the pixel circuits.

2. The self-luminous display device of claim 1 , wherein

the drive transistor is connected to the anode of the light-emitting diode,

the cathode potential of the light-emitting diode is fixed at a predetermined level between the first and second levels,

the drive signal generating circuit generates the drive signal in which the second, first and third level signals are sequentially repeated, and

the drive signal generating circuit supplies the generated drive signal to the light-emitting diode via the drive transistor from one of two nodes of the drive transistor through which an operating current flows, the node being opposite to the node to which the light-emitting diode is connected.

3. The self-luminous display device of claim 1 , wherein

the drive signal generating circuit supplies the first level signal to the pixel circuits for a constant period before supplying the third level signal to the pixel circuits.

4. The self-luminous display device of claim 3 , wherein

the drive signal generating circuit supplies the second level signal to the pixel circuits before supplying the first level signal to the pixel circuits.

5. The self-luminous display device of claim 4 , wherein

the drive signal generating circuit generates the drive signal in which the second, first and third level signals are sequentially repeated, and

the drive signal generating circuit supplies the generated drive signal to the pixel circuits.

6. The self-luminous display device of claim 5 , wherein

the drive signal contains the first, third and second level signals within one frame or field period.

7. A driving method of a self-luminous display device, the self-luminous display device including

pixel circuits, each of the pixel circuits including

a light-emitting diode,

a drive transistor connected to a drive current path of the light-emitting diode, and

a holding capacitor coupled to a control node of the drive transistor, and

the driving method comprising the steps of:

stopping the light emission without reverse-biasing the light-emitting diode;

reverse-biasing the light-emitting diode and initializing the voltage held by the holding capacitor for a constant period;

correcting the driving transistor and writing a data voltage to the control node; and

applying a light emission enabling bias to the light-emitting diode according to the written data voltage.

8. The driving method of a self-luminous display device of claim 7 , wherein

in the light emission disabling process step, initialization step and light emission enabling bias application step, the potential of the anode of the light-emitting diode to which the drive transistor is connected is controlled by a three-value drive signal, the three-value drive signal taking on a minimum value in the initialization step, a maximum value in the light emission enabling bias application step, and a value between the minimum and maximum values in the light emission disabling process step.

Assignments (6)