TOUCH SENSING PANEL AND DEVICE FOR DETECTING MULTI-TOUCH SIGNAL

• US 20130027348A1
• Filed: 02/25/2011
• Published: 01/31/2013
• Est. Priority Date: 04/08/2010
• Status: Abandoned Application

• Current Assignee: Melfas Incorporated
• Original Assignee: Melfas Incorporated
• Inventors: Oh, Do Hwan, Rhim, Byung Sang
• Application Number:
  US13/639,787
• Publication Number:
  US 20130027348A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Provided are a touch sensing panel and a touch sensing apparatus for detecting an absolute location with respect to at least one touch, including a driving electrode forming a mutual capacitance between a sensing electrode and the driving electrode in response to a predetermined driving signal and including at least two electrode surfaces divided by a width size.

Claims

1. A touch sensing panel, comprising:

a plurality of first electrodes; and

a plurality of second electrodes to which a driving signal is applied, wherein the plurality of first electrodes are electrically insulated from the plurality of second electrodes, and each of the plurality of second electrodes is placed at a location corresponding to the plurality of first electrodes, and has a relatively narrow width.

2. The touch sensing panel of claim 1, further comprising:

a plurality of third electrodes disposed between the plurality of second electrodes, wherein each of the plurality of third electrodes is placed at a location corresponding to the plurality of first electrodes, and has a relatively wide width.

3. The touch sensing panel of claim 1, wherein:

the plurality of first electrodes are formed in a first axial direction, the plurality of second electrodes are formed in a second axial direction, and the first axial direction intersects the second axial direction.

4. The touch sensing panel of claim 3, wherein points where the plurality of first electrodes intersect with the plurality of second electrodes are disposed in a matrix form on a two dimensional (2D) plane.

5. The touch sensing panel of claim 1, wherein a size of the width corresponds to a scalar value measured in a first axial direction.

6. The touch sensing panel of claim 2, wherein the plurality of second electrodes have a shape meshing with the plurality of third electrodes, and the plurality of second electrodes have a relatively larger area than the plurality of third electrodes.

7. The touch sensing panel of claim 6, wherein a driving signal is applied to each of the plurality of second electrodes, and a constant voltage is applied to each of the plurality of third electrodes.

8. The touch sensing panel of claim 1, wherein the plurality of first electrodes are formed on a surface relatively closer to a touched object than the plurality of second electrodes.

9. The touch sensing panel of claim 1, further comprising:

a touch sensor chip to acquire a detected signal generated in the plurality of first electrodes by a touched object, and to generate touch information using the detected signal.

10. The touch sensing panel of claim 9, wherein the touch sensor chip corrects errors of the detected signal due to a resistance component present between two ends of the plurality of first electrodes and the plurality of second electrodes to generate the touch information.

16. A controller chip to determine a touched input applied to the touch sensing panel according claim 1.

11. A touch sensing apparatus, comprising:

a plurality of first electrodes extending in a first axial direction;

a plurality of second electrodes extending in a second axial direction intersecting with the first axial direction; and

a controller chip to determine a touched input based on a detected signal generated between the plurality of first electrodes and the plurality of second electrodes, wherein each of the plurality of second electrodes has a variable width along the second axial direction, and each width of the plurality of second electrodes has a minimal value at a point where the plurality of second electrodes intersect the plurality of first electrodes.

12. The touch sensing apparatus of claim 11, further comprising:

a plurality of third electrodes formed on the same surface as the plurality of second electrodes, wherein the plurality of third electrodes are disposed between each of the plurality of second electrodes.

13. The touch sensing apparatus of claim 11, wherein the controller chip applies a driving signal to each second electrode, and determines the touched input by detecting a change of a mutual capacitance generated between the plurality of first electrodes and the plurality of second electrodes where the driving signal is applied by a touched object.

14. The touch sensing apparatus of claim 12, wherein the controller chip applies a driving signal to each second electrode, and applies a constant voltage to the third electrode.

15. The touch sensing apparatus of claim 14, wherein the controller chip applies the constant voltage at a ground level to the third electrode.