TOUCH PANEL AND APPARATUS FOR DRIVING THEREOF

• US 20160274708A1
• Filed: 06/02/2016
• Published: 09/22/2016
• Est. Priority Date: 08/28/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Hwang, Jong Hee, CHO, Sung Yong, KIM, Eun Jung
• Granted Patent: US 9,678,589 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 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 Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

Disclosed is a touch sensing display device capable of sensing both touch position and touch force, shortening a driving time for the touch sensing, and improving touch sensing efficiency, and an apparatus for driving thereof. The display device can include a color filter, a plurality of first touch electrodes for touch force sensing, and a plurality of second touch electrodes for touch position sensing and separated from the first touch electrodes by the color filter. The display can also include a force sensing touch driver for the first touch electrodes and a touch position touch driver for the second touch electrodes.

Claims

1. A touch sensing display device, comprising:

a first touch electrode for touch force sensing of a touch;

a second touch electrode for touch position sensing of the touch; and

a driver to sense change of the capacitance according to a distance between the touch and the first touch electrode for sensing a force level of the touch, and to sense change of the capacitance of the second touch electrode according to the touch for sensing a position of the touch.

2. The touch sensing display device of claim 1, wherein the distance between the touch and the first touch electrode is different from a distance between the touch and the second touch electrode.

3. The touch sensing display device of claim 2, further comprising a color filter substrate located between the first touch electrode and the second touch electrode.

4. The touch sensing display device of claim 3, wherein,

the first touch electrode located on the color filter substrate, and

the second touch electrode located below the color filter substrate.

5. The touch sensing display device of claim 3, wherein,

the first touch electrode is on-cell type touch electrode located on the color filter substrate, and

the second touch electrode is in-cell type touch electrode located on a TFT substrate.

6. The touch sensing display device of claim 3, further comprising:

a cover substrate located on the color filter substrate; and

an elastic dielectric layer located between the color filter substrate and the cover substrate.

7. The touch sensing display device of claim 6, wherein the elastic dielectric layer is changed in thickness due to force of the touch, to thereby change the capacitance between the touch and the first touch electrode.

8. The touch sensing display device of claim 6, wherein the elastic dielectric layer comprises at least one of PDMS (polydimethylsiloxane), acrylic or poly-urethane.

9. The touch sensing display device of claim 1, wherein the driver comprises:

a first touch driver to supply a first touch driving signal to the first touch electrode for sensing the force level of the touch, and to sense the change of the capacitance according to the distance between the touch and the first touch electrode; and

a second touch driver to supply a second touch driving signal to the second touch electrode for sensing the position of the touch, and to sense the change of the capacitance of the second touch electrode according to the touch.

10. The touch sensing display device of claim 9, further comprising:

a display driving circuit to supply data voltages to data lines of the display device during a first portion of a frame period,

wherein the first touch driver generates the first touch driving signal during the first portion of a frame period and the second touch driver generates the second touch driving signal during a second portion of the frame period.

11. A touch sensing display device, comprising:

a plurality of first touch electrodes;

a plurality of second touch electrodes; and

a driver connected to the plurality of first touch electrodes and the plurality of second touch electrodes,

wherein the driver to supply at least one first touch driving signal to the first touch electrodes for sensing a force level of a touch, to generate data indicative of a subset of the first touch electrodes corresponding to an area of the touch, and to supply at least one second touch driving signal to the subset of the second touch electrodes for sensing a position of the touch based on at least one control signal indicative of the subset of the second touch electrodes corresponding to the area of the touch.

12. The touch sensing display device of claim 11, further comprising a controller to generate, based on the data indicative of the subset of the first touch electrodes corresponding the touch, the control signal indicative of the subset of the second touch electrodes corresponding to the area of the touch.

13. The touch sensing display device of claim 12, wherein the driver comprises:

a first touch driver to supply the at least one first touch driving signal to the first touch electrodes for sensing the force level of the touch, and to generate the data indicative of the subset of the first touch electrodes corresponding to the area of the touch; and

a second touch driver to supply the at least one second touch driving signal to the subset of the second touch electrodes for sensing the position of the touch based on the at least one control signal indicative of the subset of the second touch electrodes corresponding to the area of the touch.

14. The touch sensing display device of claim 11, wherein the distance between the touch and the first touch electrode is different from a distance between the touch and the second touch electrode.

15. The touch sensing display device of claim 14, further comprising a color filter substrate located between the first touch electrodes and the second touch electrodes.

16. The touch sensing display device of claim 15, wherein,

the first touch electrode located on the color filter substrate, and

the second touch electrode located below the color filter substrate.

17. The touch sensing display device of claim 15, wherein,

the first touch electrode is on-cell type touch electrode located on the color filter substrate, and

the second touch electrode is in-cell type touch electrode located on a TFT substrate.

18. The touch sensing display device of claim 15, further comprising:

a cover substrate located on the color filter substrate; and

an elastic dielectric layer located between the color filter substrate and the cover substrate.

19. The touch sensing display device of claim 18, wherein the elastic dielectric layer is changed in thickness due to force of the touch, to thereby change the capacitance between the touch and the first touch electrode.

20. The touch sensing display device of claim 18, wherein the elastic dielectric layer comprises at least one of PDMS (polydimethylsiloxane), acrylic or poly-urethane.