Driving circuit, touch display device, and method for driving the touch display device

Patent metadata

Field	Value
Publication number	US-11487371-B2
Application number	US-202016872089-A
Country	US
Kind code	B2
Filing date	May 11, 2020
Priority date	Sep 8, 2015
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

The present embodiments relate to a touch technology and, more particularly, to a touch display device, which includes multiple first electrodes embedded in a display panel, at least one second electrode positioned outside the display panel, and a touch force sensing gap existing between the multiple first electrodes and the at least one second electrode, a method for driving the same, and a driving circuit for driving the multiple first electrodes and the at least one second electrode. The present embodiments, as described above, make it possible to sense not only a touch position, but also a touch force, with which the user presses the screen during a touch.

First claim

What is claimed is:

1. A driving circuit comprising:
a signal generating circuit configured to generate and output a first electrode driving signal;
a first electrode driving circuit configured to:
distribute the first electrode driving signal to a plurality of first electrodes embedded in a display panel, during a display mode period, and
sequentially apply the first electrode driving signal to the plurality of first electrodes during a touch mode period that does not overlap with the display mode period; and

a second electrode driving circuit configured to apply a second electrode driving signal to a second electrode outside the display panel and capacitively coupled to the plurality of first electrodes, during the touch mode period,
wherein the first electrode driving circuit comprises an integrator and an analog-digital converter, and the second electrode driving circuit is different from the first electrode driving circuit and implemented as at least one printed circuit on which a signal line is arranged so as to transfer the second electrode driving signal to the second electrode, and
wherein the second electrode driving signal has a direct current (DC) voltage and is applied to the second electrode during both the display mode period and the touch mode period.

2. The driving circuit of claim 1 , wherein the signal generating circuit is configured to receive the first electrode driving signal and the second electrode driving signal from the first electrode driving circuit.

3. The driving circuit of claim 1 , further comprising a signal converter configured to generate the second electrode driving signal by converting the first electrode driving signal.

4. The driving circuit of claim 1 , further comprising a sensing processor configured to simultaneously sense a touch position and a touch force, with regard to a single touch, on a basis of a signal received from each of the plurality of first electrodes through the first electrode driving circuit during the touch mode period.

5. The driving circuit of claim 4 , wherein each of the signal generating circuit, the first electrode driving circuit, and the sensing processor is implemented as a separate integrated circuit, or at least two of the signal generating circuit, the first electrode driving circuit, and the sensing processor are implemented as a single integrated circuit.

6. The driving circuit of claim 1 , wherein driving for sensing a touch position and driving for sensing a touch force proceed simultaneously.

7. The driving circuit of claim 1 , wherein the signal generating circuit is further configured to generate and output the second electrode driving signal.

8. The driving circuit of claim 1 , wherein the first electrode driving circuit further comprises a data driving circuit configured to apply a data voltage to a data line arranged on the display panel during the display mode period.

9. The driving circuit of claim 1 , wherein the DC voltage is a predetermined reference voltage or a ground voltage.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Cheolse
• Lee Buyeol
• Park Yongchan
• Ju Suyun

Classifications

• G06F3/04166

  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

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04105

  Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position · CPC title

• G06F3/0443

  using a single layer of sensing electrodes · CPC title