Touch Sensing Device

• US 20150370369A1
• Filed: 06/16/2015
• Published: 12/24/2015
• Est. Priority Date: 06/19/2014
• Status: Abandoned Application

• Current Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: Kuo, Wei-Lun, Ho, Kai-Ting, Ding, Peng-Yun
• Application Number:
  US14/740,362
• Publication Number:
  US 20150370369A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A touch sensing device includes a driving electrode and a sensing electrode. The driving electrode includes an electrode main stem and a plurality of electrode fingers. The electrode main stem has a planar contour of substantially a long strip, and has a longer side parallel to a first direction. The electrode fingers extend from the electrode main stem towards a second direction substantially perpendicular to the first direction. At least two electrode fingers of the electrode fingers have different lengths in the second direction. The sensing electrode includes a main body. The main body has a plurality of recessed portions that correspond and interleave with the electrode fingers to form a mutual capacitive touch region.

Claims

1. A touch sensing device, comprising:

a first driving electrode, comprising a first electrode main stem and a plurality of electrode fingers, the first electrode main stem having a planar contour of substantially a long strip and having a longer side substantially parallel to a first direction, the first fingers extending from the first electrode main stem towards a second direction substantially perpendicular to the first direction, at least two first electrode fingers of the first electrode fingers having different lengths in the second direction; and

a sensing electrode, having a plurality of first recessed portions that correspond and interleave with the first electrode fingers to form a first mutual capacitive sensing region.

2. The touch sensing device according to claim 1, wherein the first electrode fingers comprise N upper electrode fingers, a length of an i^th upper electrode finger of the N upper electrode fingers in a second direction is L_Ui, and a length of the N^th upper electrode finger of the N upper electrode fingers in the second direction is L_UN, where L_Ui<

L_U(i+1), N is a positive integer greater than 1, and i is an integer index ranging between 1 and (N−

1).

3. The touch sensing device according to claim 2, wherein the first electrode fingers further comprise M lower electrode fingers, a 1^st lower electrode finger of the M lower electrode fingers is adjacent to the N^th upper electrode fingers of the N upper electrode fingers, a length of the j^th lower electrode finger of the M lower electrode fingers in the second direction is L_Dj, and a length of the M^th lower electrode finger of the M lower electrode fingers in the second direction is L_DM, wherein L_UN≧

L_Dj>

L_D(i+1), M is a positive integer greater than 1, and j is an integer index ranging between 1 and (M−

1).

4. The touch sensing device according to claim 1, wherein the plurality of first electrode fingers have a planar contour of substantially a trapezoid.

5. The touch sensing device according to claim 1, further comprising:

a second driving electrode, comprising a second electrode main stem and a plurality of second electrode fingers, the second electrode main stem having a planar contour of substantially a long strip and having a longer side substantially parallel to the first direction, the second electrode fingers having a planar contour of substantially a rectangle and extending from the second electrode main stem towards the second direction; and

a third driving electrode, comprising a third electrode main stem and a plurality of third electrode fingers, the third electrode main stem having a planar contour of substantially a long strip and having a longer side substantially parallel to the first direction, the third electrode fingers having a planar contour of substantially a rectangle and extending from the third electrode main stem towards a direction opposite the second direction;

wherein, the sensing electrode further comprises a plurality of second recessed portions that correspond and interleave with the second electrode fingers of the second driving electrode to form a second mutual capacitive sensing region;

the sensing electrode further comprise a plurality of third recessed portions that correspond and interleave with the third electrode fingers of the third driving electrode to form a third mutual capacitive sensing region;

a part of the second electrode fingers and a part of the first electrode fingers have same positions in the first direction, and another part of the second electrode fingers and a part or all of the third electrode fingers have same positions in the first direction.

6. A touch sensing device, comprising:

a plurality of electrode groups, forming a plurality of mutual capacitive sensing regions; and

at least one auxiliary electrode, located at a same plane as the electrode groups, disposed between two of the electrode groups and connected to a constant voltage supply end in the touch sensing device.

7. The touch sensing device according to claim 6, wherein the constant voltage supply end is a ground end.

8. The touch sensing device according to claim 6, wherein the at least one auxiliary electrode is disposed in a gap within the electrode groups.

9. The touch sensing device according to claim 6, wherein the at least one auxiliary electrode and the electrode groups are substantially transparent single-layer electrodes.

10. The touch sensing device according to claim 6, further comprising:

an antenna, configured to transceive a wireless signal;

wherein, the at least one auxiliary electrode further comprises an extension portion that separates the antenna from the electrode groups.

11. The touch sensing device according to claim 6, further comprising:

a first sensing electrode, corresponding to a first self capacitive touch key; and

a second sensing electrode, corresponding to a second self capacitive touch key;

wherein, the first sensing electrode comprises a first extension portion, the second sensing electrode comprises a second extension portion, and the first extension portion and the second extension portion are adjacent to each other to form a mutual capacitive sensing region corresponding to a mutual capacitive touch key.

12. The touch sensing device according to claim 11, further comprising:

a control module, configured to detect whether the mutual capacitive sensing regions are affected in a first time interval, and to detect whether the self capacitive touch keys are affected in a second time interval.

13. A touch sensing device, comprising:

a plurality of electrode groups, forming a plurality of mutual capacitive sensing regions; and

at least one virtual electrode, located at a substantially same plane as the electrode groups, disposed between two of the electrode groups and floated.

14. The touch sensing device according to claim 13, wherein the at least one virtual electrode is disposed in a gap within the plurality of electrode groups.

15. The touch sensing device according to claim 13, wherein the electrode groups and the virtual electrode are substantially transparent single-layer electrodes.