Driver circuit for display panel, display panel and driving method for display panel

Patent metadata

Field	Value
Publication number	US-11373604-B2
Application number	US-202117475808-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Aug 29, 2019
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

A driver circuit of a display panel, a display panel, and a driving method of the display panel. The display panel includes a plurality of sub-pixel units, and the driver circuit includes a plurality of detection capacitors, a detection capacitor and a compensation module; a first end of each of the plurality of detection capacitors is electrically connected to the plurality of sub-pixel units, and a second end of each of the plurality of detection capacitors is grounded; a first end of the drive module is electrically connected to the first end of each of the plurality of detection capacitors; and a second end of the drive module is electrically connected to the compensation module.

First claim

What is claimed is:

1. A driver circuit of a display panel, wherein the display panel comprises a plurality of sub-pixel units, and the driver circuit comprises:
a plurality of detection capacitors, first ends of the plurality of detection capacitors electrically connected to the plurality of the sub-pixel units of the display panel and second ends of the plurality of detection capacitors being grounded;
a drive module, a first end of the drive module electrically connected to the first end of each of the plurality of detection capacitors, and the drive module is configured to acquire a voltage of each of the plurality of detection capacitors after being discharged through a corresponding sub-pixel unit of the plurality of sub-pixel units within a detection time duration in a detection mode; and
a compensation module, electrically connected to a second end of the drive module and configured to determine a compensation gain value corresponding to the each sub-pixel unit according to the voltage after being discharged and determine a drive signal of the each sub-pixel unit upon displaying a preset gray scale according to the compensation gain value;

wherein the detection time duration is determined according to a service time duration of the display panel,
wherein the compensation module determines the compensation gain value corresponding to the each sub-pixel unit by adopting a formula as follows

Gain
=

T
⁢

⁢
23

t
⁢

⁢
23

·

V
REF

-

V

SEN
⁢

⁢
0

V
REF

-

V
SEN

,

wherein in response to t>tp, T 23 =K*t, and in response to t≤tp, T 23 =t 23 , K is an aging coefficient of the display panel, t is the service time duration of the display panel, and tp is a time constant wherein V SEN is a voltage of each of the plurality of detection capacitors after being discharged within the detection time duration T 23 at a current moment, VS SEN0 is a voltage of each of the plurality of detection capacitors after being discharged within an initial detection time duration t 23 in a factory shipment, V REF is a reference voltage of each of the plurality of detection capacitors before being discharged, and Gain is the compensation gain value corresponding to the each sub-pixel unit.

2. The driver circuit of claim 1 , wherein, the drive module comprises a drive unit configured to collect the voltage of each of the plurality of detection capacitors after being discharged within the detection time duration;
the drive unit comprises an analog-to-digital converter; and
a detection voltage range of the analog-to-digital converter is determined according to the service time duration of the display panel.

3. The driver circuit of claim 2 , wherein,
the drive module further comprises a switching unit, and the drive unit is electrically connected to the each sub-pixel unit through the switching unit; and
the switching unit is configured to switch to a corresponding conduction channel based on a working state of the drive unit.

4. The driver circuit of claim 3 , wherein,
the switching unit comprises:
a second switch, a control end of the second switch configured to receive a second control signal, a first end of the second switch electrically connected to the first end of each of the plurality of detection capacitors, and a second end of the second switch configured to receive a reference voltage; and
a third switch, a control end of the third switch configured to receive a third control signal, a first end of the third switch electrically connected to the drive unit, and a second end of the third switch connected to the first end of the second switch.

5. The driver circuit of claim 4 , further comprising: a first capacitor and a fourth switch;
wherein the each sub-pixel unit comprises a pixel driver circuit for driving the each sub-pixel unit to emit light, a first end of the fourth switch is electrically connected to the first end of the third switch and a first end of the first capacitor, a second end of the fourth switch is electrically connected to the pixel driver circuit through a data bus, a control end of the fourth switch is configured to receive a fourth control signal, and a second end of the first capacitor is grounded.

6. A display panel, comprising the driver circuit of the display panel of claim 1 .

7. The display panel of claim 6 , wherein,
the drive module comprises a drive unit configured to collect the voltage of each of the plurality of detection capacitors after being discharged within the detection time duration;
the drive unit comprises an analog-to-digital converter; and
a detection voltage range of the analog-to-digital converter is determined according to the service time duration of the display panel.

8. The display panel of claim 7 , wherein,
the drive module further comprises a switching unit, and the drive unit is electrically connected to the each sub-pixel unit through the switching unit; and
the switching unit is configured to switch to a corresponding conduction channel based on a working state of the drive unit.

9. The display panel of claim 6 , wherein the each sub-pixel unit comprises a first switch and an organic light emitting diode;
wherein a first end of the first switch is electrically connected to the organic light-emitting diode,
a second end of the first switch is electrically connected to the first end of each of the plurality of detection capacitors, and a control end of the first switch is configured to receive a first control signal.

10. The driver circuit of claim 9 , wherein the each sub-pixel unit further comprises a pixel driver circuit configured to drive the plurality of sub-pixel units to emit light, and the first switch is a thin film transistor in the pixel driver circuit.

11. The display panel of claim 6 , wherein each of the plurality of sub-pixel unit comprises a pixel driver circuit configured to drive the each sub-pixel unit to emit light, the drive signal comprises a driving current and a driving voltage, and the compensation module determines the drive signal of the each sub-pixel unit upon the each sub-pixel unit displaying the preset gray scale by adopting a formula as follows:
I′=Gain·I 0

Assignees

• Yungu Gu An Tech Co Ltd
• Yungu Guan Tech Co Ltd

Inventors

• Xie Hongjun

Classifications

• 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

• G09G2320/0295

  by monitoring each display pixel · CPC title

• G09G3/3233 Primary

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

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title