Driver circuit, touch display device, and method of driving the touch display device

Patent metadata

Field	Value
Publication number	US-10203802-B2
Application number	US-201715478613-A
Country	US
Kind code	B2
Filing date	Apr 4, 2017
Priority date	Apr 6, 2016
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A driver circuit, a touch display device, and a method of driving the touch display device. Touching force is sensed by driving a plurality of first electrodes disposed in a display panel and a second electrode located outside of the display panel. The first electrodes corresponding to force sensors for sensing the touching force and the second electrode are driven by alternating in-phase driving and antiphase driving. Touching force components are selectively and accurately extracted from sensing data, and the touching force can be accurately sensed.

First claim

What is claimed is:

1. A touch display device, comprising:
a display panel;
a plurality of first electrodes disposed within the display panel;
a second electrode located outside of the display panel; and
a driver circuit outputting a first electrode driving signal to be provided to at least one first electrode among the plurality of first electrodes and outputting a second electrode driving signal to be provided to the second electrode during each of touch mode sections,
wherein the driver circuit outputs the first electrode driving signal and the second electrode driving signal in phase with each other during a first driving section, and
wherein the driver circuit outputs the first electrode driving signal and the second electrode driving signal in antiphase with each other, and the first and second electrode driving signals in antiphase with each other are provided to the at least one first electrode and the second electrode respectively during a second driving section after or before the first driving section.

2. The touch display device according to claim 1 , wherein, when the first electrode driving signal and the second electrode driving signal are in phase with each other, the second electrode driving signal has a greater amplitude than the first electrode driving signal.

3. The touch display device according to claim 1 , wherein at least one first driving section or at least one second driving section is present during each of the touch mode sections.

4. The touch display device according to claim 1 , wherein the driver circuit senses at least one of a touched position and touching force by producing touch-related information in each of preset sensing sections, each of the preset sensing sections corresponding to one or more frame sections.

5. The touch display device according to claim 4 , wherein, during a single sensing section of the sensing sections, a number of the first driving sections is equal to a number of the second driving sections, and a total number obtained by summing the number of the first driving sections and the number of the second driving sections is an even number.

6. The touch display device according to claim 5 , wherein the driver circuit produces the touch-related information based on antiphase sensing data corresponding to a sensing value obtained by at least one process of antiphase driving and in-phase sensing data corresponding to a sensing value obtained by at least one process of in-phase driving during the sensing section.

7. The touch display device according to claim 6 , wherein the driver circuit calculates subtraction data by performing subtraction on the antiphase sensing data and the in-phase sensing data during the sensing section, calculates touching force variation data by dividing the subtraction data by the total number of the driving sections, and produces the touch-related information regarding at least one of presence of the touching force, an amount of the touching force, and a touching force level based on the touching force variation data.

8. The touch display device according to claim 6 , wherein the driver circuit calculates sum data by summing the antiphase sensing data and the in-phase sensing data during the sensing section, calculates touched position variation data by dividing the sum data by the total number of the driving sections, and produces the touch-related information regarding at least one of occurrence of the touch and the touched position based on the touched position variation data.

9. The touch display device according to claim 6 , wherein the antiphase sensing data has a greater value than the in-phase sensing data.

10. The touch display device according to claim 9 , wherein a difference between the antiphase sensing data and the in-phase sensing data is proportional to a touching force variation.

11. The touch display device according to claim 1 , wherein the driver circuit senses at least one of a touched position and touching force based on a signal received from the at least one first electrode.

12. The touch display device according to claim 1 , wherein at least one gap is provided between the plurality of first electrodes and the second electrode, a size of the gap being variable depending on touching force applied to the display panel.

13. The touch display device according to claim 1 , wherein the second electrode is located below or within a lower structure of the display panel.

14. A method of driving a touch display device, comprising:
first driving of outputting a first electrode driving signal to be provided to at least one first electrode among a plurality of first electrodes disposed within a display panel and outputting a second electrode driving signal to be provided to a second electrode located outside of the display panel during a first driving section;
second driving of outputting a first electrode driving signal to be provided to at least one first electrode among the plurality of first electrodes and a second electrode driving signal to be provided to the second electrode located outside of the display panel during a second driving section after or before the first driving section; and
sensing at least one of a touched position and touching force based on sensing data obtained in the first driving and sensing data obtained in the second driving, wherein
in the first driving, the first electrode driving signal and the second electrode driving signal are respectively provided to the at least one first electrode and the second electrode in phase with each other, and
in the second driving, the first electrode driving signal and the second electrode driving signal are respectively provided to the at least one first electrode and the second electrode in antiphase with each other.

15. A driver circuit, comprising:
a signal generator circuit generating and outputting a first electrode driving signal;
a first electrode driver circuit providing the first electrode driving signal to at least one first electrode among a plurality of first electrodes disposed within a display panel during each of touch mode sections; and
a second electrode driver circuit providing a second electrode driving signal to a second electrode located outside of the display panel during each of the touch mode sections,
wherein the first electrode driving signal and the second electrode driving signal are respectively provided to the at least one first electrode and the second electrode in phase with each other during a preset first driving section, and
wherein the first electrode driving signal and the second electrode driving signal are respectively provided to the at least one first electrode and the second electrode in antiphase with each other during a preset second driving section after or before the first driving section.

16. The driver circuit according to claim 15 , wherein the signal generator circuit generates and outputs the second electrode driving signal.

17. The driver circuit according to claim 15 , further comprising a signal converter generating the second electrode driving signal by converting the first electrode driving signal.

18. The driver circuit according to claim 15 , further comprising a sensing processor sensing touching force of a touch based on a signal received from the at least one first electrode through the first electrode driver circuit during each of the touch mode sections.

19. The driver circuit according to claim 18 , wherein the signal generator circuit, the first electrode driver circuit, and the sensing processor comprise separ

Assignees

• Lg Display Co Ltd

Inventors

• Han Sungsu
• Kim Cheolse
• Kim Sungchul
• Ju Suyun

Classifications

• G06F3/044

  by capacitive means · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G06F3/0414

  using force sensing means to determine a position · CPC title