Method for driving display panel integrated with touch function, display module and display device including the same

Patent metadata

Field	Value
Publication number	US-11487387-B2
Application number	US-202117356802-A
Country	US
Kind code	B2
Filing date	Jun 24, 2021
Priority date	Dec 24, 2020
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

The present disclosure provides a method for driving a display panel, a display module and a display device. The display panel includes a touch electrode. The method includes: in a touch stage, providing a touch signal to the touch electrode. The touch stage includes: a first touch sub-stage and a second touch sub-stage spaced from each other; the touch signal includes: an uplink signal and a touch driving signal, and an active level of the uplink signal is higher than an active level of the touch driving signal. In the first touch sub-stage, the uplink signal is provided to the touch electrode; and in the second touch sub-stage, the touch driving signal is provided to the touch electrode.

First claim

What is claimed is:

1. A method for driving a display panel, wherein the display panel comprises a touch electrode, and the method comprises:
in a touch stage, providing a touch signal to the touch electrode;
wherein the touch stage comprises: a first touch sub-stage and a second touch sub-stage spaced from each other; the touch signal comprises: an uplink signal and a touch driving signal, and an active level of the uplink signal is greater than an active level of the touch driving signal; and
in the first touch sub-stage, the uplink signal is provided to the touch electrode; and in the second touch sub-stage, the touch driving signal is provided to the touch electrode,
wherein a number of pulses of a touch synchronization signal within a display time of one frame is N, where N is an integer greater than 1;
in response to the touch synchronization signal and a vertical synchronization signal being both at active levels, the number of pulses of the touch synchronization signal starts to be counted;
in response to the number of pulses of the touch synchronization signal being counted to N, a modulation signal having a first level and a second level is provided;
in response to the first level of the modulation signal, the uplink signal is provided to the touch electrode; and
in response to the second level of the modulation signal, the touch driving signal is provided to the touch electrode.

2. The method of claim 1 , wherein the display panel further comprises a pixel electrode, and the method further comprises:
in a display stage, providing a data signal to the pixel electrode;
wherein the touch stage comprises a plurality of touch sub-stages containing the first touch sub-stage and the second touch sub-stage, the display stage comprises a plurality of display sub-stages, and the plurality of touch sub-stages alternate with the plurality of display sub-stages.

3. The method of claim 2 , wherein the first 1˜2 touch sub-stages of the plurality of touch sub-stages each are the first touch sub-stage, and the rest of the touch sub-stages each are the second touch sub-stage.

4. The method of claim 2 , wherein the plurality of touch sub-stages comprises only one first touch sub-stage,
in a part of the first touch sub-stage, the uplink signal is provided to the touch electrode; and in the remaining part of the first touch sub-stage, the touch driving signal is provided to the touch electrode, and
in the entire second touch sub-stage, the touch driving signal is provided to the touch electrode.

5. The method of claim 1 , wherein the display panel further comprises a plurality of gate lines and a plurality of data lines intersecting with each other to define a plurality of pixel units, and the method further comprises:
applying signals with the same waveform as the touch signal to the plurality of gate lines and the plurality of data lines in the touch stage.

6. The method of claim 2 , further comprising: in the display stage, providing a common level signal to the touch electrode.

7. A display module, comprising: a display panel and a driving circuit, the display panel comprising a touch electrode, the driving circuit being configured to provide a touch signal to the touch electrode in a touch stage,
wherein the touch stage comprises: a first touch sub-stage and a second touch sub-stage spaced from each other; the touch signal comprises: an uplink signal and a touch driving signal, and an active level of the uplink signal is greater than an active level of the touch driving signal; and
the driving circuit is configured to: provide the uplink signal to the touch electrode in the first touch sub-stage; and provide the touch driving signal to the touch electrode in the second touch sub-stage,
wherein the driving circuit comprises: a modulation sub-circuit, a first selection sub-circuit, and a second selection sub-circuit;
the modulation sub-circuit is configured to generate a modulation signal having a first level and a second level; a duration of the first level is the same as a time during which the uplink signal is applied to the touch electrode; a duration of the second level is the same as a time during which the touch driving signal is provided to the touch electrode;
the first selection sub-circuit is configured to generate the uplink signal using a first power supply voltage signal according to the first level of the modulation signal; and
the second selection sub-circuit is configured to generate the touch driving signal using a second power supply voltage signal according to the second level of the modulation signal.

8. The display module of claim 7 , wherein the modulation sub-circuit comprises: a gate circuit and a counter;
a first input terminal of the gate circuit is configured to receive a touch synchronization signal, a second input terminal of the gate circuit is configured to receive a vertical synchronization signal, an output terminal of the gate circuit is coupled to a first input terminal of the counter, and the gate circuit is configured to output a start signal through the output terminal in response to the touch synchronization signal and the vertical synchronization signal both being at active levels; and
a second input terminal of the counter is configured to receive the touch synchronization signal, a third input terminal of the counter is coupled to a counting signal terminal, an output terminal of the counter is coupled to the first selection sub-circuit and the second selection sub-circuit, and the counter is configured to start counting a number of pulses of the touch synchronization signal in response to the start signal; and output the modulation signal through the output terminal in response to the number of pulses of the touch synchronization signal being counted to N.

9. The display module of claim 8 , wherein the first selection sub-circuit comprises: a first diode, a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor;
a first electrode of the first diode is coupled to an output terminal of the modulation sub-circuit and a control electrode of the fourth transistor, and a second electrode of the first diode is coupled to a control electrode of the third transistor;
a control electrode of the first transistor is coupled to a first node, a first electrode of the first transistor is coupled to a first power supply voltage terminal, and a second electrode of the first transistor is coupled to a second node;
a control electrode of the second transistor is coupled to the second node, a first electrode of the second transistor is coupled to the first power supply voltage terminal, and a second electrode of the second transistor is coupled to the first node;
a first electrode of the third transistor is coupled to the first node, and a second electrode of the third transistor is coupled to a third power supply voltage terminal;
a first electrode of the fourth transistor is coupled to the second node, and a second electrode of the fourth transistor is coupled to the third power supply voltage terminal; and
a control electrode of the fifth transistor is coupled to the second node, a first electrode of the fifth transistor is coupled to the first power supply voltage terminal, a second electrode of the fifth transistor is coupled to a touch signal line, and the touch signal line is coupled to the touch electrode.

10. The display module of claim 9 , wherein the second selection sub-circuit comprises: a second diode, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, and a tenth transistor;
a first electrode of the second diode is coupled to the output terminal of the modulation sub-circuit and

Assignees

• Chongqing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd
• Beijing Boe Technology Dev Co Ltd

Inventors

• Dang Kangpeng
• Zuo Cheng
• Chen Hong
• Tang Yuansheng
• Li Kuan
• Wang Bo
• Guo Xiong
• Luo Zhongli
• Gao Ming
• Zhang Dayu

Classifications

• G06F3/03545 Primary

  Pens or stylus · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G06F3/04162

  for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware · CPC title