Mutual-capacitance touch sensing device and electronic system including the same

Patent metadata

Field	Value
Publication number	US-8994687-B2
Application number	US-201213604875-A
Country	US
Kind code	B2
Filing date	Sep 6, 2012
Priority date	Oct 6, 2011
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A mutual-capacitance touch sensing device including a touch panel, a plurality of driving electrodes and a plurality of sensing electrodes is provided. The touch panel is substantially parallel to a reference plane. The driving and sensing electrodes are arranged to from a matrix including a plurality of sensing units. Each of the sensing units is associated with at least one driving electrode and at least one sensing electrode. A gap is formed between the at least one driving electrode and the at least one sensing electrodes. A projection length of the gap on the reference plane is longer than a total length of two diagonal lines in each of the sensing units.

First claim

What is claimed is:

1. A mutual-capacitive touch sensing device, comprising:
a touch panel, substantially parallel to a reference plane;
a plurality of driving electrodes; and
a plurality of sensing electrodes, the driving electrodes and the sensing electrodes forming a matrix comprising a plurality of sensing units;
wherein, each of the sensing units is associated with at least one driving electrode and at least one sensing electrode, a gap formed between the at least one driving electrode and the at least one sensing electrode, and a projection length of the gap on the reference plane is longer than a total length of two diagonal lines in each of the sensing units.

2. The mutual-capacitive touch sensing device according to claim 1 , wherein each of the driving electrodes and each of the sensing electrodes respectively comprise a central area and a plurality of extension areas, and the extension areas are arranged to surround the central area and are respectively connected to the central area.

3. The mutual-capacitive touch sensing device according to claim 2 , wherein the central area of each sensing electrode and the central area of each driving electrode are respectively a rectangular area, the extension areas of each sensing electrode are extended from four sides of the rectangular area, a recess is formed between every two extension areas, where the plurality of the recesses of each sensing electrode respectively accommodate the extension areas of different driving electrodes.

4. The mutual-capacitive touch sensing device according to claim 2 , wherein the extension areas of each sensing electrode are substantially a plurality of branch-like areas.

5. The mutual-capacitive touch sensing device according to claim 2 , wherein the extension areas of each sensing electrode is substantially a plurality of rectangular areas.

6. The mutual-capacitive touch sensing device according to claim 2 , wherein shapes of the sensing electrodes and the driving electrodes are complementary.

7. The mutual-capacitive touch sensing device according to claim 2 , wherein shapes of the sensing electrodes and the driving electrodes are symmetrical.

8. The mutual-capacitive touch sensing device according to claim 1 , wherein the gap is bent-shaped with at least two turning points, and a projection width of any two random sections of the gap on the reference plane is substantially the same.

9. The mutual-capacitive touch sensing device according to claim 8 , wherein the gaps formed in the sensing units have substantially a same shape.

10. The mutual-capacitive touch sensing device according to claim 1 , wherein each of the sensing units comprises a part of a driving electrode and a remaining part of another driving electrode, and a part of a sensing electrode and a remaining part of another sensing electrode.

11. The mutual-capacitive touch sensing device according to claim 10 , wherein an area of the part of the driving electrode is half of an area of the driving electrode, and the part of the sensing electrode has a half of an area of the sensing electrode.

12. The mutual-capacitive touch sensing device according to claim 1 , wherein each of the driving electrodes and each of the sensing electrodes respectively comprise a connecting area and a plurality of extension areas, and the extension areas are arranged at one side of the connecting area and are respectively connected to the connecting area.

13. The mutual-capacitive touch sensing device according to claim 1 , wherein a projection width of the gap on the reference plane is between 0.03 um and 0.3 mm.

14. The mutual-capacitive touch sensing device according to claim 1 , wherein the gap comprises two neighboring gap sections substantially parallel to each other, and the two gap sections are spaced 0.7 mm to 1 mm apart.

15. The mutual-capacitive touch sensing device according to claim 1 , wherein the sensing units render even mutual capacitance variations when a touch event takes place at the sensing units.

16. An electronic system, comprising:
a touch panel, being substantially parallel to a reference plane;
a plurality of driving electrodes;
a plurality of sensing electrodes, the driving electrodes and the sensing electrodes forming a matrix comprising a plurality of sensing units;
an analysis module, for determining whether the sensing units are touched according to a plurality of output signals from the sensing electrodes to generate an analysis result; and
a control module, for determining a post-touch reaction of the electronic system in response to the analysis result provided by the analysis module;
wherein, each of the sensing units is associated with at least one driving electrode of the driving electrodes and at least one sensing electrode of the sensing electrodes, a gap formed between the at least one driving electrode and the at least one sensing electrode, and a projection length of the gap on the reference plane is longer than a total length of two diagonal lines in each of the sensing units.

17. The electronic system according to claim 16 , wherein each of the driving electrodes and each of the sensing electrodes respectively comprise a central area and a plurality of extension areas, and the extension areas are arranged to surround the central area and are respectively connected to the central area.

18. The electronic system according to claim 16 , wherein each of the driving electrodes and each of the sensing electrodes respectively comprise a connecting area and a plurality of extension areas, and the extension areas are arranged at one side of the connecting area and are respectively connected to the connecting area.

19. The electronic system according to claim 16 , wherein a width of the gap projected onto the reference plane is between 0.03 um and 0.3 mm.

20. The electronic system according to claim 16 , wherein the gap comprises two neighboring gap sections substantially parallel to each other, and the two gap sections are spaced 0.7 mm to 1 mm apart.

21. The electronic system according to claim 16 , wherein the sensing units render more even mutual capacitance variations when a touch event takes place at the sensing units.

Assignees

• Yeh Ting-Hao
• Chang fu-sheng
• Mstar Semiconductor Inc

Inventors

• Yeh Ting-Hao
• Chang fu-sheng

Classifications

• G06F2203/04111

  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 title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title

• G06F3/0448 Primary

  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

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title