Display panel and pixel circuit with detection and compensation of anode voltage using the same output pin for multiple pixels

Patent metadata

Field	Value
Publication number	US-12400591-B2
Application number	US-202017000586-A
Country	US
Kind code	B2
Filing date	Aug 24, 2020
Priority date	Dec 14, 2018
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

The present application discloses a display panel, a pixel circuit and a method for driving the pixel circuit. The pixel circuit includes a drive chip, a plurality of pixel circuit units and a plurality of detection circuit units, the pixel circuit unit including a first switch tube and an electroluminescent element. A first path end of the first switch tube is connected to an anode of the electroluminescent element. A control end of the first switch tube is connected to a scan signal end. The first path end of the second switch tube is connected to the anode of the electroluminescent elements via the pixel circuit unit.

First claim

What is claimed is:

1. A pixel circuit, comprising:
a drive chip;
a plurality of pixel circuit units; and
a plurality of detection circuit units, wherein the plurality of pixel circuit units and the plurality of detection circuit units are coupled to the drive chip, each detection circuit unit independently corresponds to a group of the plurality of pixel circuit units arranged along a first direction and is selectively coupled to each pixel circuit unit in the group of the plurality of pixel circuit units, the first direction is a row direction or a column direction of the pixel circuit units arranged in an array, and; each pixel circuit unit comprises:
a storage capacitor selectively coupled to the drive chip, configured to receive and store an anode voltage compensation signal from the drive chip, and a first end of the storage capacitor is connected to a first operating voltage;
a first switch tube and
an electroluminescent element, the first switch tube has a path end electrically connected to an anode of the electroluminescent element, and a control end connected to a scan signal end, and each detection circuit unit comprises:
a selection circuit comprising a second switch tube having:
a first path end connected to the anode of the electroluminescent element via a corresponding pixel circuit unit,
a control end connected to a first timing signal end, and
a second path end connected to the drive chip;
when the second switch tube in the detection circuit unit is in a conduction state and the first switch tube in the pixel circuit unit coupled to the detection circuit unit is also in the conduction state, the drive chip detects a potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube in the conduction state; and
at least two detection circuit units arranged adjacently along a second direction to form a group, wherein the at least two adjacent detection circuit units in the group are connected to each other via a connection terminal, and are connected to a same pin of the drive chip via the connection terminal, and the second direction is a column direction or a row direction of the pixel circuit units arranged in the array different from the first direction.

2. The pixel circuit according to claim 1 , wherein the first switching tube in each pixel circuit unit arranged along the second direction is connected to a same scan signal end.

3. The pixel circuit according to claim 1 , wherein, each detection circuit unit further comprises:
a reset circuit comprising a third switch tube having;
a first path end connected to the anode of the electroluminescent element in a corresponding pixel circuit unit via the corresponding pixel circuit unit,
a control end connected to a second timing signal end, and
a second path end connected to a reset signal end.

4. The pixel circuit according to claim 3 , wherein, each pixel circuit unit further comprises:
a current control drive tube coupled to the anode of the electroluminescent element, the storage capacitor is selectively coupled to a control end of the current control drive tube and further configured to control the current control drive tube in accordance with the anode voltage compensation signal.

5. The pixel circuit according to claim 4 , wherein the first path end of the third switch tube in each detection circuit unit is coupled to the storage capacitor in the corresponding pixel circuit and the storage capacitor is selectively reset processed.

6. The pixel circuit according to claim 4 , wherein the selection circuit further comprises:
a tenth switch tube having a first path end coupled to an end of the storage capacitor, a second path end coupled to the connection terminal and the drive chip, and a control end coupled to a fifth timing signal end.

7. The pixel circuit according to claim 4 , wherein each pixel circuit unit further comprises:
a fourth switch tube, a first path end of the fourth switch tube is connected to a first operating voltage terminal, a control terminal of the fourth switch tube is connected to an enable signal terminal;
a fifth drive tube, the fifth drive tube is the current control drive tube, a second path end of the fourth switch tube is connected to the first path end of the fifth drive tube, and a control end of the fifth drive tube is connected to a second end of the storage capacitor;
a sixth switch tube, a second path end of the fifth drive tube is connected to a first path end of the sixth switch tube, a second path end of the sixth switch tube is connected to the second path end of the first switch tube and the anode of the electroluminescent element; and a control end of the sixth switch tube is connected to an enable signal end;
a seventh switch tube, a second path end of the fifth drive tube is connected to a second path end of the seventh switch tube, a first path end of the seventh switch tube is connected to the control end of the fifth drive tube; and a control end of the seventh switch tube is connected to a third timing signal end;
an eighth switch tube, a first path end of the eighth switch tube is connected to the second end of the storage capacitor, a second path end of the eighth switch tube is connected to the first path end of the second switch tube and the first path end of the third switch tube, and a control end of the eighth switch tube is connected to a fourth timing signal end; and
a ninth switch tube, a second path end of the fourth switch tube is connected to the second path end of the ninth switch tube, the second path end of the ninth switch tube is connected to the first path end of the fifth drive tube, and a control end of the ninth switch tube is connected to the third timing signal end; and the selection circuit in each detection circuit unit further comprises:
a tenth switch tube, a first path end of the ninth switch tube is connected to the first path end of the tenth switch tube, a second path end of the tenth switch tube is connected to the connection terminal and the drive chip, and a control end of the tenth switch tube is connected to a fifth timing signal end,
the first end of the storage capacitor is connected to a first terminal of the fourth switch tube a cathode of the electroluminescent element is connected to a second working voltage, the first path end of the second switch tube is connected to the first path end of the first switch tube, and the first path end of the third switch tube is connected to the first path end of the first switch tube, and
corresponding to each group of two adjacent pixel circuit units arranged along the second direction, the second path end of the second switch tube is connected to a same input-output pin of the drive chip.

8. The pixel circuit according to claim 7 , wherein the seventh switch tube and the eighth switch tube have a double-gate switch tube structure comprising:
a first sub-switch tube, a first path end of the first sub-switch tube is a first path end of the double-gate switch tube structure; and
a second sub-switch tube, a second path end of the second sub-switch tube is a second path end of the double-gate switch tube structure, a gate of the first sub-switch tube and a gate of the second sub-switch tube are connected as a control end of the double-gate switch tube structure, and a second path end of the first sub-switch tube and a first path end of the second sub-switch tube are connected.

9. The pixel circuit of claim 1 , wherein each pixel circuit unit corresponds to a sub-pixel unit of a display panel, three sub-pixel units are a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit, adjacent sub-pixel units of red, green, and blue colors form a pixel uni

Assignees

• Kunshan Govisionox Optoelectronics Co Ltd

Inventors

• Fan Longfei
• Wang Longyan
• Zhu Hui
• Han Zhenzhen
• Hu Siming
• Wu Jianlong
• Zhang Lu

Classifications

• G09G2310/08

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

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G3/3291

  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

• G09G2320/0295

  by monitoring each display pixel · CPC title

• G09G2310/0297

  Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns · CPC title