Pixel circuit, display device and pixel driving method

Patent metadata

Field	Value
Publication number	US-2021027711-A1
Application number	US-202016829407-A
Country	US
Kind code	A1
Filing date	Mar 25, 2020
Priority date	Jul 25, 2019
Publication date	Jan 28, 2021
Grant date	—

Abstract

A pixel circuit includes a sensing circuit, a gray-scale control circuit and a light-emitting switch circuit; the sensing circuit is configured to charge and discharge a sensing capacitor when a sensing capacitor is formed by a touch object and an anode layer of OLED; the gray-scale control circuit is configured to control the light-emitting intensity of the OLED; the light-emitting switch circuit is configured to control the OLED to emit light.

First claim

What is claimed is:

1 . A pixel circuit, disposed in an Organic Light-Emitting Diode (OLED) display device, comprising: a sensing circuit, a gray-scale control circuit and a light-emitting switch circuit;
wherein the sensing circuit is electrically connected to a sensor signal line and an anode layer of the OLED and charges and discharges the sensing capacitor when a sensing capacitor is formed by a touch object and the anode layer of the OLED; the gray-scale control circuit is electrically connected to a data signal line and controls light-emitting intensity of the OLED; the light-emitting switch circuit is electrically connected to a light-emitting signal line and the anode layer of the OLED, and controls the OLED to emit light; and the gray-scale control circuit is electrically connected to the light-emitting switch circuit, and the gray-scale control circuit is configured to control the light-emitting intensity of the OLED when the light-emitting switch circuit controls the OLED to emit light.

2 . The pixel circuit according to claim 1 , wherein
a first terminal, a second terminal, and a third terminal of the sensing circuit are electrically connected to an (n−1)-th gate signal line, the sensor signal line, and the anode layer of the OLED, respectively, where n is an integer and n>1; a cathode layer of the OLED is electrically connected to a first voltage terminal; a first terminal and a second terminal of the gray-scale control circuit are electrically connected to an n-th gate signal line and the data signal line, respectively; if the sensor signal line sends a pulse signal and an initialization signal at intervals, both a third terminal and a fifth terminal of the gray-scale control circuit are electrically connected to a first node; both the anode layer of the OLED and the third terminal of the sensing circuit are electrically connected to the first node; if the sensor signal line sends the pulse signal and an initialization signal line sends the initialization signal, the third terminal of the gray-scale control circuit is electrically connected to the anode layer of the OLED, and the fifth terminal of the gray-scale control circuit is connected to the initialization signal line; a first terminal of the light-emitting switch circuit is electrically connected to the light-emitting signal line; and a second terminal and a third terminal of the light-emitting switch circuit are electrically connected to a fourth terminal of the gray-scale control circuit and a second voltage terminal, respectively.

3 . The pixel circuit according to claim 2 , wherein the sensing circuit comprises a first switching device;
a control electrode of the first switching device is used as the first terminal of the sensing circuit; a first electrode and a second electrode of the first switching device are used as the second terminal and the third terminal of the sensing circuit, respectively; and the first electrode of the first switching device is externally connected to a driving circuit through the sensor signal line; and the driving circuit continuously sends pulse signal to the sensing capacitor formed by the anode layer of the OLED and the touch object through the sensor signal line when the first switching device is turned on.

4 . The pixel circuit according to claim 3 , wherein the gray-scale control circuit comprises a second switching device, a third switching device, and a first charge storage device;
a control electrode and a first electrode of the second switching device are used as the first terminal and the second terminal of the gray-scale control circuit, respectively; a second electrode of the second switching device is electrically connected to a second node; a first electrode of the third switching device is used as the fourth terminal of the gray-scale control circuit; a control electrode of the third switching device is electrically connected to the second node; one terminal of the first charge storage device is electrically connected to the second node; and a second electrode of the third switching device is used as the third terminal of the gray-scale control circuit, and another terminal of the first charge storage device is used as the fifth terminal of the gray-scale control circuit.

5 . The pixel circuit according to claim 4 , wherein the light-emitting switch circuit comprises a fourth switching device;
a control electrode of the fourth switching device is used as the first terminal of the light-emitting switch circuit; and a first electrode and a second electrode of the fourth switching device are used as the second terminal and the third terminal of the light emitting switch circuit, respectively.

6 . The pixel circuit according to claim 1 , wherein a first terminal of the sensing circuit is electrically connected to an n-th gate signal line or an n-th pulse signal line;
a second terminal and a third terminal of the sensing circuit are electrically connected to the sensor signal line and the anode layer of the OLED, respectively, where n is an integer and n>1; a cathode layer of the OLED is electrically connected to a first voltage terminal; a first terminal and a second terminal of the gray-scale control circuit are electrically connected to the n-th gate signal line and the data signal line, respectively; if the sensor signal line sends a pulse signal and an initialization signal at intervals, a third terminal of the gray-scale control circuit is electrically connected to the third node; and the third node is electrically connected to the second terminal of the sensing circuit and the sensor signal line; if the sensor signal line sends the pulse signal and an initialization signal line sends the initialization signal, the third terminal of the gray-scale control circuit is electrically connected to the initialization signal line; a fourth terminal of the gray-scale control circuit is electrically connected to an (n- 1 )-th gate signal line; a fifth terminal of the gray-scale control circuit is electrically connected to a second voltage terminal; a first terminal of the light-emitting switch circuit is electrically connected to the light-emitting signal line; a second terminal, a third terminal, and a fourth terminal of the light-emitting switch circuit are electrically connected to a sixth terminal and a seventh terminal of the gray-scale control circuit and the second voltage terminal, respectively; and a fifth terminal of the light-emitting switch circuit is electrically connected to the anode layer of the OLED.

7 . The pixel circuit according to claim 6 , wherein the sensing circuit comprises a fifth switching device;
a control electrode of the fifth switching device is used as the first terminal of the sensing circuit; a first electrode and a second electrode of the fifth switching device are used as the second terminal and the third terminal of the sensing circuit, respectively.

8 . The pixel circuit according to claim 7 , wherein the gray-scale control circuit comprises a sixth switching device, a seventh switching device, an eighth switching device, a ninth switching device, and a second charge storage device;
control electrodes of the sixth switching device and the eighth switching device are used as the first terminal of the gray-scale control circuit; a first electrode of the sixth switching device is used as the second terminal of the gray-scale control circuit; a second electrode of the sixth switching device is electrically connected to a fourth node; a control electrode and a first electrode of the ninth switching device are used as the fourth terminal of the gray-scale control circuit and the third terminal of the gray-scale control circuit, respectively; a seco

Assignees

• Boe Technology Group Co Ltd

Inventors

• Qin Wei
• Xu Zhiqiang
• Li Xiaolong
• Wang Tieshi
• Liu Weixing
• Guo Kai
• Peng Jintao
• Niu Yanan
• Peng Kuanjun

Classifications

• G06V40/1306

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• G06V40/1318

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2354/00

  Aspects of interface with display user · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title