Active matrix organic light emitting diode pixel unit circuit, display panel and electronic product

Patent metadata

Field	Value
Publication number	US-9535531-B2
Application number	US-201314234937-A
Country	US
Kind code	B2
Filing date	Sep 24, 2013
Priority date	Jun 26, 2013
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

The present invention provides an Active Matrix Organic Light Emitting Diode (AMOLED) pixel unit circuit, a display panel and an electronic product for integrating a touch screen circuit into the AMOLED pixel unit circuit and producing an AMOLED display panel having the functionality of a touch screen. The AMOLED pixel unit circuit comprises a driving module, configured to amplify a sensing signal generated by a touch sensing module, output the sensing signal through a sensing signal output module, and drive a light emitting module; the light emitting control module, configured to control the light emitting module to emit light; a threshold compensation module, configured to compensate a threshold voltage of the driving module; the touch sensing module, configured to generate the sensing signal and output the sensing signal to the driving module; and the sensing signal output module, configured to output the sensing signal amplified by the driving module.

First claim

What is claimed is:

1. An Active Matrix Organic Light Emitting Diode (AMOLED) pixel unit circuit, comprising a light emitting circuit, an amplifying and driving circuit, a threshold compensation circuit, a light emitting control-circuit, a touch sensing circuit and a sensing signal outputting circuit, wherein
the amplifying and driving circuit is configured to amplify a sensing signal generated by the touch sensing circuit, output the sensing signal through the sensing signal outputting circuit, and drive the light emitting circuit;
the light emitting control-circuit is configured to control the light emitting circuit to emit light;
the threshold compensation circuit is configured to compensate a threshold voltage of the amplifying and driving circuit;
the touch sensing circuit is configured to generate the sensing signal and output the sensing signal to the amplifying and driving circuit; and
the sensing signal outputting circuit is configured to output the sensing signal amplified by the amplifying and driving circuit,
wherein the amplifying and driving circuit comprises a first transistor, wherein a gate electrode of the first transistor is directly connected to a first node of the AMOLED pixel unit circuit, and a source electrode and a drain electrode of the first transistor are directly connected to a second node and a third node of the AMOLED pixel unit circuit, respectively, wherein the first node is a point directly connecting the amplifying and driving circuit and the threshold compensation circuit; the second node is a point directly connecting the amplifying and driving circuit, the light emitting control circuit, and the sensing signal outputting circuit; and the third node is a point directly connecting the amplifying and driving circuit, the light emitting control circuit, and the threshold compensation circuit.

2. The AMOLED pixel unit circuit according to claim 1 , wherein the light emitting control circuit comprises a second transistor, a fourth transistor, a fifth transistor and a sixth transistor, wherein a gate electrode of the second transistor is connected to a second signal control line of the AMOLED pixel unit circuit, and a source electrode and a drain electrode of the second transistor are connected to a low voltage level signal line and the second node of the AMOLED pixel unit circuit, respectively; a gate electrode of the fifth transistor is connected to a first signal control line of the AMOLED pixel unit circuit—a source electrode and a drain electrode of the fifth transistor are connected to the third node of the AMOLED pixel unit circuit and a power line, respectively; and a gate electrode of the sixth transistor is connected to the second signal control line of the AMOLED pixel unit circuit, and a source electrode and a drain electrode of the sixth transistor are connected to the third node of the AMOLED pixel unit circuit and light emitting circuit, respectively.

3. The AMOLED pixel unit according to claim 2 , wherein the light emitting circuit comprises a light emitting diode, one end of the light emitting diode is connected to the sixth transistor and the other end of the light emitting diode is connected to the power line.

4. The AMOLED pixel unit circuit according to claim 3 , wherein the threshold compensation circuit comprises the fourth transistor and a first capacitor, wherein
a gate electrode of the fourth transistor is connected to a third signal control line of the AMOLED pixel unit circuit—a source electrode and a drain electrode of the fourth transistor are connected to the third node and the first node, respectively; and the first capacitor is connected between the first node and the low voltage level signal line.

5. The AMOLED pixel unit circuit according to claim 4 , wherein the touch sensing circuit comprises a seventh transistor and an induction element, wherein a gate electrode of the seventh transistor is connected to the first signal control line of the AMOLED pixel unit circuit, and a source electrode and a drain electrode of the seventh transistor are connected to the induction element and the first node respectively.

6. The AMOLED pixel unit circuit according to claim 5 , wherein the sensing signal outputting circuit comprises a third transistor, a gate electrode of the third transistor is connected to the second signal control line of the AMOLED pixel unit circuit, and a source electrode and a drain electrode of the third transistor are connected to a data line and the second node, respectively.

7. The AMOLED pixel unit circuit according to claim 6 , wherein a range of a grayscale voltage of the data line is VDL˜VDH, wherein VDL<VDH<a predetermined level, wherein VDL is a low voltage and VDH is a high voltage, where VDL is not equal to VDH.

8. The AMOLED pixel unit circuit according to claim 7 , wherein a voltage of the low voltage level signal line is VSS, wherein VSS<VDL.

9. The AMOLED pixel unit circuit according to claim 5 , wherein the induction element is a photodiode, an anode of the photodiode is connected to the low voltage level signal line, and a cathode of the photodiode is connected to the seventh transistor.

10. The AMOLED pixel unit circuit according to claim 5 , wherein the induction element is an induction capacitor, one end of the induction capacitor is connected to the seventh transistor and the other end is used to detect a touching signal.

11. The AMOLED pixel unit circuit according to claim 3 , wherein a cathode of the light emitting diode is connected to the sixth transistor and an anode of the light emitting diode is connected to the power line.

12. The AMOLED pixel unit circuit according to claim 2 , wherein the first transistor, the second transistor, the fourth transistor, the fifth transistor, and the sixth transistor are N-type Thin Film Transistors (TFTs), and the third transistor is P-type TFT.

13. A display panel comprising the AMOLED pixel unit circuit according to claim 1 .

14. An electronic product comprising the display panel according to claim 13 .

Assignees

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

Inventors

• Tan Wen
• Qi Xiaojing
• Zhou Quanguo

Classifications

• H01L27/3262

  Electricity · mapped topic

• H01L27/323

  Electricity · mapped topic

• H01L27/3276

  Electricity · mapped topic

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/042

  by opto-electronic means · CPC title