OLED pixel circuit, driving method thereof and display panel

Patent metadata

Field	Value
Publication number	US-9626035-B2
Application number	US-201414424789-A
Country	US
Kind code	B2
Filing date	Apr 25, 2014
Priority date	Dec 27, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

The present invention provides an organic light emitting diode pixel circuit, a driving method thereof and a display panel. The OLED pixel circuit comprises a light emitting module comprising an organic light emitting diode for emitting light; a light emitting control module for controlling the light emitting module to emit light; a driving module, so as to control the light emitting module to emit light; a threshold compensation module, and a data signal input module configured for inputting a data signal; the OLED pixel circuit further comprises: a touch sensing module configured for generating a touch sensing signal; and a touch detection module configured for detecting the touch sensing signal, and providing an initial voltage for the threshold compensation module, wherein the driving module amplifies the touch sensing signal generated by the touch sensing module and then outputs it to the touch detection module.

First claim

The invention claimed is:

1. An organic light emitting diode pixel circuit comprising: a light emitting module which comprises an organic light emitting diode for emitting light; a light emitting control module comprising a fourth thin film transistor and a fifth thin film transistor, which is configured for controlling the light emitting module to emit light; a driving module comprising a first thin film transistor, which is configured for driving the light emitting control module, so as to control the light emitting module to emit light; a threshold compensation module comprising a second thin film transistor and a storage capacitor, which is configured for compensating threshold voltage of the driving module; and a data signal input module comprising a sixth thin film transistor, which is configured for inputting a data signal;
wherein the organic light emitting diode pixel circuit further comprises:
a touch sensing module, which is configured for generating a touch sensing signal and outputting the touch sensing signal to the driving module, the touch sensing module comprising a seventh thin film transistor and a detection device for touch detection, a gate electrode of the seventh thin film transistor is connected to a first control signal for the preceding row of pixels each including the OLED pixel circuit a source electrode and a drain electrode of the seventh thin film transistor are connected to the first node and one terminal of the detection device respectively; wherein, the first node is a connection point of the threshold compensation module and the driving module;
a touch detection module comprising a third thin film transistor, which is configured for detecting the touch sensing signal from the driving module, and providing an initial voltage for the threshold compensation module;
wherein the driving module amplifies the touch sensing signal generated by the touch sensing module and then outputs it to the touch detection module.

2. The organic light emitting diode pixel circuit according to claim 1 , wherein a gate electrode of the first thin film transistor is connected to the first node, a source electrode and a drain electrode of the first thin film transistor are connected to a second node and a third node respectively; the second node is a connection point of the light emitting control module, the threshold compensation module and the touch detection module, and the third node is a connection point of the light emitting control module and the data signal input module.

3. The organic light emitting diode pixel circuit according to claim 2 , wherein the detection device is a photodiode or a sensing capacitor, and the other terminal of the detection device is connected to a first power supply.

4. The organic light emitting diode pixel circuit according to claim 2 , wherein a gate electrode of the fourth thin film transistor is connected to a second control signal, a source electrode and a drain electrode of the fourth thin film transistor are connected to the light emitting module and the second node respectively, a gate electrode of the fifth thin film transistor is connected to a first control signal for the current row of pixels, a source electrode and a drain electrode of the fifth thin film transistor are connected to the third node and a first power source respectively.

5. The organic light emitting diode pixel circuit according to claim 3 , wherein a gate electrode of the fourth thin film transistor is connected to a second control signal, a source electrode and the drain electrode of the fourth thin film transistor are connected to the light emitting module and the second node respectively, a gate electrode of the fifth thin film transistor is connected to a first control signal for the current row of pixels, a source electrode and a drain electrode of the fifth thin film transistor are connected to the third node and a first power supply respectively.

6. The organic light emitting diode pixel circuit according to claim 5 , wherein one terminal of the organic light emitting diode of the light emitting module is connected to the source electrode or the drain electrode of the fourth thin film transistor, and the other terminal is connected to a second power source.

7. The organic light emitting diode pixel circuit according to claim 6 , wherein the gate electrode of the second thin film transistor is connected to a third control signal, the source electrode and the drain electrode of the second thin film transistor are connected to the first node and the second node respectively; the two terminals of the storage capacitor are connected to the first node and the first power source respectively.

8. The organic light emitting diode pixel circuit according to claim 7 , wherein the gate electrode of the third thin film transistor is connected to the first control signal for the preceding row of pixels each including the OLED pixel circuit, the source electrode and the drain electrode of the third thin film transistor are connected to the second node and an initial voltage and detection port respectively.

9. The organic light emitting diode pixel circuit according to claim 8 , wherein a gate electrode of the sixth thin film transistor is connected to a first control signal for the current row of pixels each including the OLED pixel circuit, a source electrode and a drain electrode of the sixth thin film transistor are connected to the data signal and the third node respectively.

10. The organic light emitting diode pixel circuit according to claim 9 , wherein the first control signal is a scanning signal.

11. The organic light emitting diode pixel circuit according to claim 10 , wherein the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, the sixth thin film transistor and the seventh thin film transistor are N-type thin film transistors; and
the fifth thin film transistor is a P-type thin film transistor.

12. A display panel comprising an organic light emitting diode pixel circuit according to claim 1 .

13. The display panel according to claim 12 , wherein in the organic light emitting diode pixel circuit, the touch sensing module comprises a seventh thin film transistor and a detection device for touch detection, a gate electrode of the seventh thin film transistor is connected to a first control signal for the preceding row of pixels each including the OLED pixel circuit, a source electrode and a drain electrode of the seventh thin film transistor are connected to the first node and one terminal of the detection device respectively; wherein, the first node is a connection point of the threshold compensation module and the driving module.

14. The display panel according to claim 13 , wherein in the organic light emitting diode pixel circuit, the driving module comprises a first thin film transistor; a gate electrode of the first thin film transistor is connected to the first node, a source electrode and a drain electrode of the first thin film transistor are connected to a second node and a third node respectively; the second node is a connection point of the light emitting control module, the threshold compensation module and the touch detection module, and the third node is a connection point of the light emitting control module and the data signal input module.

15. The display panel according to claim 14 , wherein in the organic light emitting diode pixel circuit, the detection device is a photodiode or a sensing capacitor, and the other terminal of the detection device is connected to a first power supply.

16. The d

Assignees

• Boe Technology Group Co Ltd
• Chengdu Boe Optoelect Tech Co

Inventors

• Tan Wen
• Qi Xiaojing
• Hu Like

Classifications

• G06F3/042 Primary

  by opto-electronic means · CPC title

• G09G3/3233

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

• G06F3/044

  by capacitive means · CPC title

• G09G3/3208

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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title