Organic light emitting diode display panel and organic light emitting diode display device

Patent metadata

Field	Value
Publication number	US-9607549-B2
Application number	US-201514919934-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Dec 24, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

An organic light-emitting diode display panel and an OLED display device have a sensing driving stabilizer that can increase accuracy in sensing and compensation by providing potential stability to a reference voltage line acting as a sensing line during the sensing driving.

First claim

What is claimed is:

1. An organic light-emitting diode display device, comprising:
an organic light-emitting diode display panel on which a plurality of data lines, a plurality of gate lines, and a plurality of sub-pixels are disposed;
a data driver configured to drive the plurality of data lines;
a gate driver configured to drive the plurality of gate lines;
a timing controller configured to control the data driver and the gate driver;
wherein each of the sub-pixels comprises:
an organic light-emitting diode;
a driving transistor configured to drive the organic light-emitting diode;
a sensing transistor electrically connected between a first node of the driving transistor and a reference voltage line;
a switching transistor electrically connected between a second node of the driving transistor and a data line; and
a storage capacitor electrically connected between the first node and the second node of the driving transistor; and

a stabilizing capacitor configured to be electrically connected to or disconnected from the reference voltage line depending on a driving mode.

2. The organic light-emitting diode display device according to claim 1 , wherein the stabilizing capacitor is disposed on the organic light-emitting diode display panel or outside the organic light-emitting diode display panel.

3. The organic light-emitting diode display device according to claim 1 , further configured to electrically connect the stabilizing capacitor to the reference voltage line in a section of a sensing driving mode, and electrically disconnect the stabilizing capacitor from the reference voltage line in a section of a display driving mode.

4. The organic light-emitting diode display device according to claim 3 , further comprising a switching device configured to electrically connect the reference voltage line and the stabilizing capacitor in response to a switching control signal only in sensing driving.

5. The organic light-emitting diode display device according to claim 4 , wherein the switching device comprises a transistor, the switching device configured to be controlled in response to the switching control signal applied to a gate node thereof, and being electrically connected between the reference voltage line and a first plate of the stabilizing capacitor.

6. The organic light-emitting diode display device according to claim 5 , wherein
the stabilizing capacitor and the switching device are disposed on the organic light-emitting diode display panel, and
a gate wire through which the switching control signal is applied to the gate node of the switching device is further disposed on the organic light-emitting diode display panel.

7. The organic light-emitting diode display device according to claim 6 , wherein one node of a drain node and a source node of the switching device is electrically connected to the reference voltage line, the other node of the source node and the drain node of the switching device is electrically connected to the first plate of the stabilizing capacitor, and a second plate of the stabilizing capacitor is electrically connected to a ground voltage terminal.

8. The organic light-emitting diode display device according to claim 5 , further comprising a flexible printed circuit, wherein one end of the flexible printed circuit is connected to the organic light-emitting diode display panel, the other end of the flexible printed circuit is connected to a source printed circuit board, and a source driver integrated circuit of the data driver is disposed on the flexible printed circuit, wherein
the stabilizing capacitor and the switching device are disposed on the flexible printed circuit, and
a switching control signal wire through which the switching control signal is applied to the gate node of the switching device is further disposed on the flexible printed circuit.

9. The organic light-emitting diode display device according to claim 8 , wherein a connecting wire electrically connecting one node of a drain node and a source node of the switching device and the reference voltage line on the organic light-emitting diode display panel is further disposed on the flexible printed circuit.

10. The organic light-emitting diode display device according to claim 8 , wherein the switching control signal wire disposed on the flexible printed circuit is configured to receive the switching control signal via the source printed circuit board.

11. The organic light-emitting diode display device according to claim 4 , wherein the switching device is on-state during the sensing driving mode, or
the switching device is controlled with a timing equal to or corresponded with a control timing of the sensing transistor.

12. An organic light-emitting diode display panel, comprising:
a plurality of data lines;
a plurality of gate lines arranged in a direction crossing the plurality of data lines; and
a plurality of sub-pixels arranged in a shape of a matrix,
wherein each of the sub-pixels comprises:
an organic light-emitting diode;
a driving transistor configured to drive the organic light-emitting diode;
a sensing transistor electrically connected between a first node of the driving transistor and a reference voltage line;
a switching transistor electrically connected between a second node of the driving transistor and a data line; and
a storage capacitor electrically connected between the first node and the second node of the driving transistor; and

a stabilizing capacitor configured to be electrically connected to or disconnected from the reference voltage line depending on a driving mode.

13. The organic light-emitting diode display panel according to claim 12 , further configured to electrically connect the stabilizing capacitor to the reference voltage line in a section of a sensing driving mode, and to electrically disconnect the stabilizing capacitor from the reference voltage line in a section of a display driving mode.

14. The organic light-emitting diode display panel according to claim 13 , further comprising a switching device configured to electrically connect the reference voltage line and the stabilizing capacitor in response to a switch control signal only in sensing driving.

Assignees

• Lg Display Co Ltd

Inventors

• Tani Ryosuke
• Hong Sungjin
• Bae Nayoung

Classifications

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• H01L27/3265

  Electricity · mapped topic

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title