One-dimensional capacitive touch panel with stable coupling capacitance

• US 9,240,782 B2
• Filed: 04/01/2013
• Issued: 01/19/2016
• Est. Priority Date: 09/21/2012
• Status: Active Grant

• Current Assignee: Decentralized Motion Intelligence Company
• Original Assignee: Touchplus information Corp.
• Inventors: Chou, Yung-Chan, Hu, Shih Hsien
• Primary Examiner(s): Luebke, R S
• Assistant Examiner(s): ELLIOTT, DOBLADE M
• Application Number:
  US13/854,148
• Publication Number:
  US 20140083834A1
• Time in Patent Office: 1,023 Days
• Field of Search: 345/173, 345/174, 200/600
• US Class Current: 1/1
• 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 3/0443 using a single layer of sensing electrodes
• 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
• CPC Class Codes: H01H 2239/006 Containing a capacitive switch or usable as such
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2217/960705 Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe

Abstract

A touch sensitive device includes a capacitive touch panel with plural electrodes, a driving and sensing circuit electrically connected to the electrodes through sensing lines, and at least one conductive member. The conductive member is arranged orthogonal to and crosses the sensing lines without contact and is electrically connected to the driving and sensing circuit. Therefore, a stable coupling capacitance is provided for a one dimensional capacitive touch panel for improved touch sense performance.

Claims

1. A touch sensitive device, comprising:

a capacitive touch panel comprising plural electrodes;

a driving and sensing circuit electrically connected to the electrodes of the capacitive touch panel through plural sensing lines; and

at least one conductive member arranged to cross over the sensing lines without contact with any of the sensing lines, and electrically connected to the driving and sensing circuit,

wherein the driving and sensing circuit outputs a driving signal to the capacitive touch panel through the at least one conductive member, and receiving sensing signals through the sensing lines, so as to generate a coupling effect between the at least one conductive member and the sensing lines for detecting a touch-sensing action at the capacitive touch panel.

2. The touch sensitive device of claim 1, wherein the at least one conductive member is arranged above the sensing lines and on a covering layer of a carrier which encloses the sensing lines.

3. The touch sensitive device of claim 1, wherein the at least one conductive member is arranged under the sensing lines and directly under an FFC in absence of a covering layer.

4. The touch sensitive device of claim 1, wherein the at least one conductive member is arranged on a covering layer of a PCB and above the sensing lines.

5. The touch sensitive device of claim 1, wherein the at least one conductive member is arranged on one side of a PCB while the sensing lines on an opposite side.

6. The touch sensitive device of claim 1, wherein the at least one conductive member is made of carbon, silver paste, copper or aluminum foil.

7. The touch sensitive device of claim 1, wherein the at least one conductive member includes a mesh configuration.

8. The touch sensitive device of claim 1, wherein the capacitive touch panel refers to a one dimensional capacitive touch panel.

9. The touch sensitive device of claim 1, wherein the at least one conductive member is orthogonal to the sensing lines.

10. The touch sensitive device of claim 1, wherein the plural electrodes are configured to be hexagonal and arranged to be a honeycomb pattern altogether.

11. The touch sensitive device of claim 1, wherein the at least one conductive member refers to a single conductive member arranged to cross over the sensing lines.

12. The touch sensitive device of claim 1, wherein the at least one conductive member includes a first conductive member arranged to cross over a first group of the sensing lines and a second conductive member arranged to cross over a second group of the sensing lines where the sensing lines in the first group are the same ones as in the second group.

13. The touch sensitive device of claim 1, wherein the at least one conductive member includes a first conductive member arranged to cross over a first group of the sensing lines and a second conductive member arranged to cross over a second group of the sensing lines where the first group and the second group have no common sensing lines.

14. The touch sensitive device of claim 1, wherein the at least one conductive member includes a first conductive member arranged to cross over a first group of the sensing lines and a second conductive member arranged to cross over a second group of the sensing lines where the first group and the second group have at least one common sensing line.

15. A touch sensitive device, comprising:

a capacitive touch panel comprising plural electrodes formed in a specified area;

a driving and sensing circuit electrically connected to the electrodes of the capacitive touch panel through plural sensing lines extending out of the specified area; and

at least one conductive member arranged to cross over the sensing lines outside the specified area without contact with any of the sensing lines, and electrically connected to the driving and sensing circuit,

wherein the driving and sensing circuit outputs a driving signal to the capacitive touch panel through the at least one conductive member, and receiving sensing signals through the sensing lines, so as to generate a coupling effect between the at least one conductive member and the sensing lines for detecting a touch-sensing action at the capacitive touch panel.