TOUCH INPUT SENSING METHOD FOR REDUCING INFLUENCE OF PARASITIC CAPACITANCE AND DEVICE THEREFOR

• US 20160283023A1
• Filed: 11/11/2014
• Published: 09/29/2016
• Est. Priority Date: 11/12/2013
• Status: Active Grant

• Current Assignee: Solomon Systech Limited
• Original Assignee: Sentron Inc. (Solomon Systech Limited)
• Inventors: SHIN, Hyung-Cheol, YUN, Il-Hyun
• Granted Patent: US 9,990,080 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 5/178 Syringes
• CPC Class Codes: A61M 5/31 Details
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• 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 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

Disclosed is a touch input sensing device comprising: a touch input sensing electrode; a touch sensing unit connected to one point of the touch input sensing electrode to measure a change in a touch capacitance formed by the touch input sensing electrode according to a touch input; a second node included in the touch input sensing device to form a capacitance between the one point and the second node; and a potential control unit for providing a potential value following the potential of the one point to the second node to decrease a potential difference between the one point and the second node.

Claims

1. A drug injection device comprising:

A touch input sensing device comprising;

a touch input sensing electrode;

a touch sensing unit connected to one point of the touch input sensing electrode to measure a change in a touch capacitance formed by the touch input sensing electrode according to a touch input;

a second node included in the touch input sensing device to form a capacitance between the one point and the second node; and

a potential control unit for providing a potential value following the potential of the one point to the second node to decrease a potential difference between the one point and the second node.

2. The touch input sensing device of claim 1, wherein the touch input sensing electrode includes image pixels, a control line transferring a signal for controlling light output of the image pixels, and a common electrode of the image pixels.

3. The touch input sensing device of claim 1, wherein the second node includes image pixels, a control line transferring a signal for controlling light output of the image pixels, and a common electrode of the image pixels.

4. The touch input sensing device of claim 3, wherein the control line is a data control line for the image pixels or a gate control line for the image pixels.

5. The touch input sensing device of claim 2, wherein the screen output device is a TFT-LCD.

6. The touch input sensing device of claim 1, wherein:

the touch input sensing electrode is a first common electrode among the plurality of common electrodes of a screen output device including a plurality of image pixels, a plurality of control lines transferring a signal for controlling light output of the plurality of image pixels, and a plurality of common electrodes divided and provided for the plurality of image pixels, and

the following potential value is a potential value of any one common electrode selected by a predetermined method among the plurality of common electrodes.

7. The touch input sensing device of claim 1, wherein:

the touch input sensing electrode is a first common electrode among the plurality of common electrodes of a screen output device including a plurality of image pixels, a plurality of control lines transferring a signal for controlling light output of the plurality of image pixels, and a plurality of common electrodes divided and provided for the plurality of image pixels, and

the following potential value is an average value of potential values of the plurality of common electrodes.

8. The touch input sensing device of claim 1, wherein:

the touch input sensing electrode includes

the common electrode of the screen output device including image pixels, a control line transferring a signal for controlling light output of the image pixels, and a common electrode of the image pixels, and

a cycle of the following potential value is the same as a cycle of the common electrode.

9. The touch input sensing device of claim 1, wherein:

the touch sensing unit includes an operation amplifier,

a signal having a first frequency component is applied to a first input terminal of the operation amplifier and the second node, and

the touch input sensing electrode is connected to a second input terminal of the operation amplifier.

10. The touch input sensing device of claim 9, wherein the touch input sensing electrode is the common electrode of the screen output device including image pixels, a control line transferring a signal for controlling light output of the image pixels, and a common electrode of the image pixels.

11. The touch input sensing device of claim 9, wherein the second node is present in the control lien of the screen output device including image pixels, a control line transferring a signal for controlling light output of the image pixels, and a common electrode of the image pixels.

12. A user device including a touch input sensing device and a screen output device, wherein:

the touch input sensing electrode includes

1) a touch input sensing electrode;

2) a touch sensing unit connected to one point of the touch input sensing electrode to measure a change in a touch capacitance formed by the touch input sensing electrode according to a touch input;

3) a second node included in the touch input sensing device to form a capacitance between the one point and the second node; and

4) a potential control unit for providing a potential value following the potential of the one point to the second node to decrease a potential difference between the one point and the second node, and

the screen output device includes

5) image pixels;

6) a control line transferring a signal for controlling light output of the image pixels; and

7) a common electrode of the image pixels, and

the common electrode is the touch input sensing electrode.

13. The user device of claim 12, wherein the second node is present in the control line.

14. The user device of claim 13, wherein the screen output device is a TFT-LCD.

15. The user device of claim 12, wherein:

the screen output device includes a plurality of image pixels, a plurality of control lines transferring a signal fro controlling a light output of the plurality of image pixels, and a plurality of common electrodes divided and provided for the plurality of image pixels,

the touch input sensing electrode is a first common electrode among the plurality of common electrodes, and

the following potential value is a potential value of any one common electrode selected by a predetermined method among the plurality of common electrodes.

16. The user device of claim 12, wherein:

the screen output device includes a plurality of image pixels, a plurality of control lines transferring a signal fro controlling a light output of the plurality of image pixels, and a plurality of common electrodes divided and provided for the plurality of image pixels,

the touch input sensing electrode is a first common electrode among the plurality of common electrodes, and

the following potential value is an average value of potential values of the plurality of common electrodes.

17. The user device of claim 12, wherein a cycle of the following potential value is the same as a cycle of the common electrode.

18. The user device of claim 12, wherein:

the touch sensing unit includes an operation amplifier,

a signal having a first frequency component is applied to a first input terminal of the operation amplifier and the second node, and

the touch input sensing electrode is connected to a second input terminal of the operation amplifier.