Voltage driving method and device for touch display panel, and touch display panel

Patent metadata

Field	Value
Publication number	US-11209934-B2
Application number	US-201816472010-A
Country	US
Kind code	B2
Filing date	Nov 23, 2018
Priority date	Jan 16, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

The present disclosure provides a voltage driving method and device for a touch display panel, and a touch display panel, which includes a common electrode extending in a first direction and a plurality of columns of touch electrodes extending parallel to each other in a second direction. The voltage driving method includes: applying a first scanning voltage to two outermost columns of touch electrodes during a first period of a first touch cycle including a plurality of periods, the first scanning voltage being equal to a reference voltage; detecting a first output voltage output by the two outermost columns of touch electrodes during the first period; and adjusting, based on the detected first output voltage, the scanning voltage applied to the two outermost columns of touch electrodes during a first period of a second touch cycle immediately after the first touch cycle, to a second scanning voltage.

First claim

What is claimed is:

1. A voltage driving method for a touch display panel comprising a common electrode extending in a first direction and a plurality of columns of touch electrodes extending parallel to each other in a second direction, the first direction intersecting the second direction, the method comprising:
applying a first scanning voltage to two outermost columns of touch electrodes of the touch display panel during a first period of a first touch cycle, the first touch cycle comprising a plurality of periods, the first scanning voltage being equal to a reference voltage;
detecting a first output voltage output by at least one of the two outermost columns of touch electrodes during the first period of the first touch cycle; and
adjusting, based on the detected first output voltage, a scanning voltage applied to the at least one of the two outermost columns of touch electrodes during a first period of a second touch cycle immediately after the first touch cycle to a second scanning voltage, such that a second output voltage output by the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle is equal to the reference voltage.

2. The method of claim 1 , wherein, during periods of the first touch cycle other than the first period, the reference voltage is applied to each column of touch electrodes of the touch display panel other than the two outermost columns of touch electrodes.

3. The method of claim 2 , wherein the adjusting, based on the detected first output voltage, the scanning voltage applied to the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle immediately after the first touch cycle to the second scanning voltage, such that the second output voltage output by the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle is equal to the reference voltage comprises:
calculating a difference by subtracting the first output voltage from the reference voltage to form a compensation signal, and compensating the first scanning voltage by using the compensation signal to obtain the second scanning voltage, such that the second output voltage output by the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle is equal to the reference voltage.

4. The method of claim 3 , wherein the compensating the first scanning voltage by using the compensation signal comprises:
superimposing the compensation signal with the first scanning voltage to obtain the second scanning voltage; and
if the difference is positive, the compensation signal is a positive voltage signal, and if the difference is negative, the compensation signal is a negative voltage signal.

5. The method of claim 4 , wherein the method further comprises:
applying, during each period of each touch cycle other than the first period, the reference voltage to several outermost columns of touch electrodes of the touch display panel among the columns of touch electrodes to which the scanning voltage has not been applied during the touch cycle.

6. The method of claim 5 , wherein, during each period of each touch cycle other than the first period, the reference voltage is applied to 4 outermost columns of touch electrodes of the touch display panel among the columns of touch electrodes to which the scanning voltage has not been applied the scanning voltage during the touch cycle.

7. The method of claim 5 , wherein, during each period of each touch cycle other than the first period, the reference voltage are sequentially applied to the columns of touch electrodes other than the two outermost columns of touch electrodes according to an arrangement sequence of the plurality of columns of touch electrodes.

8. The method of claim 1 , wherein the adjusting, based on the detected first output voltage, the scanning voltage applied to the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle immediately after the first touch cycle to the second scanning voltage, such that the second output voltage output by the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle is equal to the reference voltage comprises:
calculating a difference by subtracting the first output voltage from the reference voltage to form a compensation signal, and compensating the first scanning voltage by using the compensation signal to obtain the second scanning voltage, such that the second output voltage output by the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle is equal to the reference voltage.

9. The method of claim 8 , wherein the compensating the first scanning voltage by using the compensation signal comprises:
superimposing the compensation signal with the first scanning voltage to obtain the second scanning voltage; and
if the difference is positive, the compensation signal is a positive voltage signal, and if the difference is negative, the compensation signal is a negative voltage signal.

10. The method claim 1 , wherein the method further comprises:
applying, during each period of each touch cycle other than the first period, the reference voltage to several outermost columns of touch electrodes of the touch display panel among the columns of touch electrodes to which the scanning voltage has not been applied during the touch cycle.

11. The method of claim 10 , wherein, during each period of each touch cycle other than the first period, the reference voltage is applied to 4 outermost columns of touch electrodes of the touch display panel among the columns of touch electrodes to which the scanning voltage has not been applied the scanning voltage during the touch cycle.

12. The method of claim 10 , wherein, during each period of each touch cycle other than the first period, the reference voltage are sequentially applied to the columns of touch electrodes other than the two outermost columns of touch electrodes according to an arrangement sequence of the plurality of columns of touch electrodes.

13. A voltage driving device for a touch display panel, the touch display panel comprising a common electrode extending in a first direction and a plurality of columns of touch electrodes extending parallel to each other in a second direction, the first direction intersecting the second direction,
the voltage driving device comprising a voltage applying portion, a voltage detection portion and a voltage control portion, wherein,
the voltage applying portion is configured to apply a first scanning voltage to two outermost columns of touch electrodes of the touch display panel during a first period of a first touch cycle, the first touch cycle comprising a plurality of periods, the first scanning voltage being equal to a reference voltage;
the voltage detection portion is configured to detect a first output voltage output by at least one of the two outermost columns of touch electrodes during the first period of the first touch cycle; and
the voltage control portion is configured to adjust, based on the detected first output voltage, a scanning voltage applied to the at least one of the two outermost columns of touch electrodes during a first period of a second touch cycle immediately after the first touch cycle to a second scanning voltage, such that a second output voltage output by the at least one of the two outermost columns of touch electrodes during the first period of the second touch cycle is equal to the reference vo

Assignees

• Ordos Yuansheng Optoelectronics Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zong Shaolei
• Wang Jieqiong
• Sun Jigang
• Ren Yanfei

Classifications

• G06F3/044

  by capacitive means · CPC title

• G09G3/36 Primary

  using liquid crystals · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/04166 Primary

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title