Capacitive touch panel with high touching sensitivity

• US 8,497,844 B2
• Filed: 11/02/2010
• Issued: 07/30/2013
• Est. Priority Date: 12/24/2009
• Status: Active Grant

• Current Assignee: Orise Technology Co., Ltd (FocalTech Systems Co.,Ltd)
• Original Assignee: Orise Technology Co., Ltd (FocalTech Systems Co.,Ltd)
• Inventors: Huang, Yen-Lin, Chen, Lin-Chien
• Primary Examiner(s): WONG, ALBERT KANG
• Application Number:
  US12/926,203
• Publication Number:
  US 20110156930A1
• Time in Patent Office: 1,001 Days
• Field of Search: 341/33, 345173-174
• US Class Current: 345/173
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes

Abstract

A capacitive touch panel has a plurality of first conductor lines and a plurality of second conductor lines. The first conductor lines are disposed in a first direction for sensing a contact with an object. The second conductor lines are disposed in a second direction to be intersected insulatively with the first conductor lines so as to define an overlapping region at each intersection of a first conductor line and a second conductor line. As a driving signal is applied to one of the second conductor lines, the overlapping region defined at the intersection forms a capacitance. Each of the first conductor lines defines at least one opening in each of the overlapping regions.

Claims

1. A capacitive touch panel, comprising:

a plurality of first conductor lines, disposed in a first direction for sensing contacts with an object; and

a plurality of second conductor lines disposed in a second direction to be intersected insulatively with the first conductor lines so as to form an overlapping region at each intersection between a first conductor line and a second conductor line, the second conductor lines periodically receiving a driving signal;

wherein the overlapping region has a mutual capacitance which equals to a first mutual capacitance when the object does not touch the capacitive touch panel and equals to a second mutual capacitance when the object touches the capacitive touch panel, and each of the first conductor lines has at least one opening in each of the overlapping regions.

2. The capacitive touch panel as claimed in claim 1, further comprising a controller which includes:

a driver, connected to the second conductor lines, for generating the driving signal; and

a detector, connected to the first conductor lines, for detecting the value of the mutual capacitance, so as to determine a change amount between the first and the second mutual capacitance in order to determine the coordinate of location touched on the capacitive touch panel by the object.

3. The capacitive touch panel as claimed in claim 1, wherein the opening is a square shape.

4. The capacitive touch panel as claimed in claim 1, wherein the opening is a rectangle shape.

5. The capacitive touch panel as claimed in claim 1, wherein the opening is a circular shape.

6. The capacitive touch panel as claimed in claim 1, wherein the opening is a hexagonal shape.

7. The capacitive touch panel as claimed in claim 1, wherein the opening is an octagonal shape.

8. The capacitive touch panel as claimed in claim 1, wherein the opening is a polygonal shape.

9. The capacitive touch panel as claimed in claim 2, wherein the first direction is vertical to the second direction.

10. The capacitive touch panel as claimed in claim 2, wherein the first direction and the second direction form an included angle between zero and 90 degrees.

11. The capacitive touch panel as claimed in claim 3, wherein the first mutual capacitance is negatively proportional to an aperture ratio defined as a ratio of a side length of the opening to a width of the first conductor lines.

12. The capacitive touch panel as claimed in claim 2, further comprising a transparent substrate having a first surface and a second surface, wherein the first surface disposed thereon the first conductor lines, and the second surface opposite to the first surface and disposed thereon the second conductor lines.

13. The capacitive touch panel as claimed in claim 2, further comprising a transparent substrate having a surface disposed thereon the second conductor lines, wherein the first conductor lines are disposed over the second conductor lines, and an insulating layer is provided therebetween.

14. The capacitive touch panel as claimed in claim 13, wherein the second conductor lines form a noise shield for the first conductor lines.

15. The capacitive touch panel as claimed in claim 2, wherein the change amount between the first and the second mutual capacitance is positively proportional to an aperture ratio defined as a ratio of a side length of the opening to a width of the first conductor lines.