CONTACT SENSING DEVICE WITH IMPROVED EDGE POSITION RECOGNITION CHARACTERISTICS

• US 20110025636A1
• Filed: 04/03/2009
• Published: 02/03/2011
• Est. Priority Date: 04/04/2008
• Status: Abandoned Application

• Current Assignee: Melfas Incorporated
• Original Assignee: Melfas Incorporated
• Inventors: Nam, Sung-Sik, Ryu, Shiwon
• Application Number:
  US12/935,664
• Publication Number:
  US 20110025636A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

A touch sensing apparatus with improved edge touch position recognition characteristics is provided. The touch sensing apparatus includes a panel unit including a plurality of sensor electrodes arranged in a line along a first axis, a sensor unit to collect sensor data indicating a change in electrical characteristics occurring in each of the plurality of sensor electrodes, the sensor unit being connected to the plurality of sensor electrodes, and a computing unit to determine a touch position on the panel unit, to which a touch of a user is applied, based on sensor data collected from at least one sensor electrode among the plurality of sensor electrodes, wherein, among the plurality of sensor electrodes, an edge sensor electrode is located on an edge in a first axis direction, and is formed narrower in width in the first axis direction than the sensor electrodes other than the edge sensor electrode. When this configuration is employed, an invalid input region formed on an edge of an input region may be removed or reduced and thus, touch position recognition characteristics of the touch sensing apparatus may be enhanced.

Claims

1. A touch sensing apparatus having a touch position determination function, the touch sensing apparatus comprising:

a panel unit comprising a plurality of sensor electrodes arranged in a line along a first axis;

a sensor unit to collect sensor data indicating a change in electrical characteristics occurring in each of the plurality of sensor electrodes, the sensor unit being connected to the plurality of sensor electrodes; and

a computing unit to determine a touch position on the panel unit, to which a touch of a user is applied, based on sensor data collected from at least one sensor electrode among the plurality of sensor electrodes,

wherein, among the plurality of sensor electrodes, an edge sensor electrode is located on an edge in a first axis direction, and is formed narrower in width in the first axis direction than the sensor electrodes other than the edge sensor electrode.

2. The touch sensing apparatus of claim 1, wherein the edge sensor electrode has a width in the first axis direction half of a width in the first axis direction of the other sensor electrodes.

3. The touch sensing apparatus of claim 1, wherein the panel unit comprises:

a first panel comprising a plurality of first sensor electrodes arranged in a line along the first axis; and

a second panel comprising a plurality of second sensor electrodes arranged in a line along a second axis intersecting the first axis.

4. The touch sensing apparatus of claim 1, wherein the edge sensor electrode comprises a plurality of triangular-shaped unit electrodes that are connected in a second axis direction intersecting the first axis direction.

5. The touch sensing apparatus of claim 1, wherein the panel unit is configured with a single layer panel having a surface on which the plurality of sensor electrodes are formed.

6. The touch sensing apparatus of claim 1, wherein the plurality of sensor electrodes are formed with different widths in the first axis direction along the second axis intersecting the first axis.

7. The touch sensing apparatus of claim 1, wherein each of the plurality of sensor electrodes has a plurality of split electrodes having a same shape.

8. The touch sensing apparatus of claim 7, wherein a plurality of split electrodes comprised in the edge sensor electrode occupy a smaller area than an area occupied by split electrodes of the other sensor electrodes.

9. The touch sensing apparatus of claim 1, wherein the computing unit computes a weighted average of a representative position of each of the plurality of sensor electrodes, using, as a weight, a sensing signal acquired from at least one of the plurality of sensor electrodes, and determines the touch position, and

wherein a representative position of the edge sensor electrode corresponds to the edge in the first axis direction, rather than corresponding to a central position in the first axis direction.

10. The touch sensing apparatus of claim 9, wherein representative positions of the other sensor electrodes correspond to a central position in a first axis direction of each of the other sensor electrodes.

11. The touch sensing apparatus of claim 1, wherein the sensor data has a value that is substantially in proportion to a touch area formed on the plurality of sensor electrodes by the touch of the user.

12. The touch sensing apparatus of claim 1, wherein the panel unit is formed of a transparent substrate, and the plurality of sensor electrodes are formed of transparent conductive materials on a surface of the transparent substrate.

13. A touch sensing apparatus having a touch position determination function, the touch sensing apparatus comprising:

a panel unit comprising a plurality of sensor electrodes arranged in a line along a first axis;

a sensor unit to collect sensor data indicating a change in electrical characteristics occurring in each of the plurality of sensor electrodes, the sensor unit being connected to the plurality of sensor electrodes; and

a computing unit to determine a first axis direction component of a touch position on the panel unit, based on sensor data collected from at least one of the plurality of sensor electrodes and a representative position on the first axis corresponding to each of the plurality of sensor electrodes,

wherein the computing unit determines a representative position of an edge sensor electrode located on an edge in a first axis direction, among the plurality of sensor electrodes, to correspond to an edge side of the panel unit, rather than corresponding to a central position in the first axis direction, and determines the first axis direction component of the touch position.

14. The touch sensing apparatus of claim 13, wherein the computing unit determines representative positions of sensor electrodes other than the edge sensor electrode to correspond to a central position in a first axis direction of each of the other sensor electrodes, and determines the first axis direction component of the touch position.

15. The touch sensing apparatus of claim 13, wherein the plurality of sensor electrodes are formed with different widths in the first axis direction along a second axis intersecting the first axis.

16. The touch sensing apparatus of claim 13, wherein the panel unit comprises:

a first panel comprising a plurality of first sensor electrodes arranged in a line along the first axis; and

a second panel comprising a plurality of second sensor electrodes arranged in a line along the second axis intersecting the first axis.

17. The touch sensing apparatus of claim 13, wherein the edge sensor electrode comprises a plurality of triangular-shaped unit electrodes that are connected in a second axis direction intersecting the first axis direction.

18. The touch sensing apparatus of claim 13, wherein the panel unit is configured with a single layer panel having a surface on which the plurality of sensor electrodes are formed.

19. The touch sensing apparatus of claim 13, wherein each of the plurality of sensor electrodes has a plurality of split electrodes having a same shape.

20. The touch sensing apparatus of claim 19, wherein a plurality of split electrodes comprised in the edge sensor electrode occupy a smaller area than an area occupied by split electrodes of the other sensor electrodes.

21. The touch sensing apparatus of claim 13, wherein the sensor data has a value that is substantially in proportion to a touch area formed on the plurality of sensor electrodes by the touch of the user.

22. The touch sensing apparatus of claim 13, wherein the panel unit is formed of a transparent substrate, and the plurality of sensor electrodes are formed of transparent conductive materials on a surface of the transparent substrate.

23. A method of manufacturing a touch sensing panel, the method comprising:

forming a plurality of sensor electrodes in a line along a first axis on a plane, using conductive materials on a surface of a first non-conductive substrate, the plane forming the first non-conductive substrate,

wherein the forming comprises forming an edge sensor electrode that is located in an edge in a first axis direction and is narrower in width in the first axis direction than the sensor electrodes other than the edge sensor electrode among the plurality of sensor electrodes.

24. The method of claim 23, wherein the first non-conductive substrate comprises a transparent substrate, and the conductive materials comprises transparent conductive materials.

25. The method of claim 23, further comprising:

attaching the first non-conductive substrate on which the plurality of sensor electrodes are formed, to a surface of a second non-conductive substrate.

26. The method of claim 23, wherein the forming comprises:

forming a first electrode set on a surface of a first substrate, the first electrode set comprising a plurality of first sensor electrodes arranged in a line along the first axis;

forming a second electrode set on a surface of a second substrate, the second electrode set comprising a plurality of second sensor electrodes arranged in a line along a second axis; and

laminating the first substrate and the second substrate.

27. The method of claim 23, further comprising:

forming a wiring pattern connected to the plurality of sensor electrodes on the first non-conductive substrate.

28. The method of claim 27, further comprising:

forming a bonding pad connected to the wiring pattern on the first non-conductive substrate.