Single layered electrode structure

Patent metadata

Field	Value
Publication number	US-9678612-B2
Application number	US-201414464003-A
Country	US
Kind code	B2
Filing date	Aug 20, 2014
Priority date	Aug 20, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A single layered electrode structure includes a plurality of first electrode groups arranged along a first direction, a plurality of second electrode groups arranged along the first direction, and a plurality of third electrodes arranged along the first direction. Each of the first electrode groups includes at least one first electrode arranged along a second direction. Each of the second electrode groups includes a plurality of second electrodes arranged along the second direction, with each of the second electrodes at least corresponding to the at least one first electrode. Each of the third electrodes is arranged as one of combinations of between two of the first electrode groups, between two of the first electrode groups, and between one of the first electrode groups and one of the second electrode groups.

First claim

What is claimed is:

1. A single layered electrode structure, comprising:
a plurality of first electrode groups arranged along a first direction, each of the first electrode groups comprising at least one first electrode arranged along a second direction;
a plurality of second electrode groups arranged along the first direction, each of the second electrode groups comprising a plurality of second electrodes arranged along the second direction, wherein each of the first electrodes at least corresponds to the at least one first electrode;
a plurality of third electrodes arranged along the first direction, each of the third electrodes located between two of the first electrode groups, between two of the second electrode groups, or between one of the first electrode group and one of the second electrode group
wherein the single layered electrode structure generates a plurality of capacitance sensing results when an external conductive object comes into proximity to said single layered electrode structure, the plurality of capacitance sensing results comprising:
a first capacitance value C m between the first electrode group and the second electrode group;
a second capacitance value C d between the external conductive object and the first electrode group;
a third capacitance value C s between the external conductive object and the second electrode group;
a fourth capacitance value C f1 between the external conductive object and third electrode, when the external conductive object is grounded;
a fifth capacitance value C f2 between the external conductive object and the third electrode;
a sixth capacitance value C f between the external conductive object and a ground, wherein the sixth capacitance value C f comprises a sum of the fourth capacitance value C f1 and the fifth capacitance value C f2 ; and
a capacitance change ΔC m between said plurality of first electrodes and the plurality of second electrodes, wherein a sensing amount of an overall mutual capacitance is represented by an equation:
Δ C m +C s *C d /( C s +C d +C f ).

2. The single layered electrode structure according to claim 1 , wherein the plurality of third electrodes comprise any combination of:
a ground electrode connected to a ground potential; and
a dummy electrode not coupled to any external wires.

3. The single layered electrode structure according to claim 2 , wherein when each of the third electrodes comprises a plurality of dummy electrodes, sizes of the dummy electrodes are substantially the same.

4. The single layered electrode structure according to claim 2 , wherein when each of the third electrodes comprises a plurality of dummy electrodes, at least two of the dummy electrodes are different in size.

5. The single layered electrode structure according to claim 2 , wherein a distance along the first direction between respective centers of two neighboring third electrodes is between 5 mm and 7 mm.

6. The single layered electrode structure according to claim 2 , further comprising a plurality of third electrodes located between the at least one first electrode and the plurality of second electrodes.

7. The single layered electrode structure according to claim 1 , wherein a plurality of first electrode conducting wires of the at least one first electrode are located along the second direction at one side of the first electrode group, and a plurality of second electrode wires of the plurality of second electrodes are located along the second direction at one side of the second electrode group.

8. The single layered electrode structure according to claim 1 , wherein each of the first electrodes comprises a plurality of twigs, each of the second electrodes comprises a plurality of twigs, and a part of the plurality of twigs of each of the first electrodes correspond to a part of the plurality of twigs of each of the second electrodes.

9. The single layered electrode structure according to claim 1 , wherein each of the first electrodes comprises a plurality of triangle-like curved electrodes, each of the second electrodes comprises a plurality of triangle-like curved electrodes, and a part of the plurality of triangle-like curved electrodes of each of the first electrodes correspond to a part of the plurality of triangle-like curved electrodes of each of the second electrodes.

10. The single layered electrode structure according to claim 9 , wherein the triangle-like curved electrodes comprise one of planar contours of:
a triangle; and
a triangle-like trapezoid.

11. The single layered electrode structure according to claim 1 , wherein an order arranged along the first direction is:
the second electrode group;
the first electrode group;
the third electrode;
the first electrode group; and
the second electrode group.

12. The single layered electrode structure according to claim 1 , wherein an order arranged along the first direction is:
the third electrode;
the second electrode group; and
the first electrode group.

13. The single layered electrode structure according to claim 1 , wherein an order arranged along the first direction is:
the third electrode;
the first electrode group; and
the second electrode group.

14. The single layered electrode structure according to claim 1 , wherein the plurality of first electrode groups are driving electrodes, and the plurality of second electrode groups are sensing electrodes.

15. The single layered electrode structure according to claim 1 , wherein the first direction is orthogonal to the second direction.

16. The single layered electrode structure according to claim 1 , wherein a plurality of first electrode conducting wires of the at least one first electrode are located along the second direction at one side of the first electrode group, a plurality of second electrode wires of the plurality of second electrodes are located along the second direction at one side of the second electrode group, and widths of the plurality of third electrodes along the first direction increase along the second direction.

Assignees

• Mstar Semiconductor Inc

Inventors

• Liu Tzu-Wei

Classifications

• G06F2203/04108

  Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/0448

  Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality · CPC title

• G06F3/0443 Primary

  using a single layer of sensing electrodes · CPC title