Pixel, pixel driving method, and display device comprising the pixel

Patent metadata

Field	Value
Publication number	US-2016012799-A1
Application number	US-201414588097-A
Country	US
Kind code	A1
Filing date	Dec 31, 2014
Priority date	Jul 9, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

An exemplary embodiment of the present invention provides a pixel including: a pixel including: a switching transistor configured to perform a switching operation according to a scan signal, the switching transistor including a first terminal that is coupled to a data line and a second transistor; a driving transistor configured to control a driving current according to a data signal that is transferred when the switching transistor is turned on, the driving transistor including a gate that is coupled to the second terminal of the switching transistor; a light-emitting element comprising a cathode and configured to emit light according to the driving current; and a contact transistor configured to perform a switching operation according to a sensing control line, the contact transistor including a first terminal coupled to the cathode electrode of the light-emitting element and a second terminal that is coupled to a sensing line to which a current of the driving transistor is applied.

First claim

what is claimed is:

1 . A pixel comprising:
a switching transistor configured to perform a switching operation according to a scan signal, the switching transistor comprising a first terminal that is coupled to a data line and a second terminal; a driving transistor configured to control a driving current according to a data signal that is transferred when the switching transistor is turned on, the driving transistor comprising a gate that is coupled to the second terminal of the switching transistor; a light-emitting element comprising a cathode and configured to emit light according to the driving current; and a contact transistor configured to perform a switching operation according to a sensing control line, the contact transistor comprising a first terminal coupled to the cathode electrode of the light-emitting element and a second terminal that is coupled to a sensing line to which a current of the driving transistor is applied.

2 . The pixel of claim 1 , further comprising
a sensing control transistor configured to perform a switching operation according to a sensing control signal, the sensing control transistor comprising a first terminal that is coupled to a second terminal of the driving transistor and a second terminal that is coupled to the sensing line.

3 . The pixel of claim 2 , wherein the sensing control transistor is an n-type transistor, and the contact transistor is a p-type transistor.

4 . The pixel of claim 3 , wherein a voltage and a current of the driving transistor are applied to the sensing line.

5 . The pixel of claim 4 , wherein each of the scan signal, the sensing control signal, and a contact signal comprises an enable pulse.

6 . A method of driving a pixel, the method comprising:
turning on a sensing control transistor according to a sensing control signal; turning on a contact transistor according to a contact signal; and resetting a source of a driving transistor to a first power source voltage through the turned-on sensing control transistor and the turned-on contact transistor.

7 . The method of claim 6 , further comprising:
turning on a switching transistor according to a scan signal; and turning on the driving transistor by applying a data signal to a gate of the driving transistor through the turned-on switching transistor.

8 . The method of claim 7 , further comprising:
maintaining a turn-on state of the sensing control transistor according to the sensing control signal; turning off the contact transistor according to the contact signal; and sensing a voltage and a current of the driving transistor by the turned-on sensing control transistor.

9 . A display device comprising:
a plurality of scan lines; a plurality of sensing control lines; a plurality of data lines; and a plurality of pixels each of which is coupled to a corresponding one of the scan lines, a corresponding one of the sensing control lines, and a corresponding one of the data, wherein each of the pixels comprises: a switching transistor configured to perform a switching operation according to a scan signal, the switching transistor comprising a first terminal that is coupled to a data line and a second terminal; a driving transistor configured to control a driving current according to a data signal that is transferred when the switching transistor is turned on, the driving transistor comprising a gate that is coupled to the second terminal of the switching transistor; a light-emitting element comprising a cathode and configured to emit light according to the driving current; and a contact transistor configured to perform a switching operation according to a sensing control line, the contact transistor comprising a first terminal coupled to the cathode electrode of the light-emitting element and a second terminal that is coupled to a sensing line to which a current of the driving transistor is applied.

10 . The display device of claim 9 , further comprising a sensing control transistor configured to perform a switching operation according to a sensing control signal, the sensing control transistor comprising a first terminal that is coupled to the second terminal of the driving transistor and a second terminal that is coupled to the sensing line.

11 . The display device of claim 10 , wherein the sensing control transistor is an n-type transistor, and the contact transistor is a p-type transistor.

12 . The display device of claim 11 , wherein a voltage and a current of the driving transistor are applied to the sensing line.

13 . The display device of claim 12 , wherein each of the scan signal, the sensing control signal, and a contact signal comprises an enable pulse.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Su Weon

Classifications

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G5/18 Primary

  Timing circuits for raster scan displays (specially adapted for television H04N {; synchronisation between the display unit and other display units, videodisc player G09G5/12}) · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2320/0295

  by monitoring each display pixel · CPC title