ELECTRODE OF SELF-CAPACITIVE TOUCH PANEL UTILIZING SERPENTINE TRACE TO INCREASE RESISTANCE

• US 20150234497A1
• Filed: 02/13/2015
• Published: 08/20/2015
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: Hung, Guo-Kiang, Chen, Chien-Chuan, Kuo, Chao-Yang
• Granted Patent: US 9,575,607 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/044 by capacitive means
• 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: H05K 1/11 Printed elements for providing electric connections to or between printed circuits
• CPC Class Codes: H05K 1/167 incorporating printed resistors
• CPC Class Codes: H05K 2201/09263 Meander
• CPC Class Codes: H05K 2201/09272 Layout details of angles or corners
• CPC Class Codes: H05K 2201/09281 Layout details of a single conductor meander H05K2201/09263; layout details of angles or corners H05K2201/09272
• CPC Class Codes: H05K 2201/09381 Shape of non-curved single flat metallic pad, land or exposed part thereof; Shape of electrode of leadless component notches in edge pads H05K2201/09181
• CPC Class Codes: H05K 2201/09418 Special orientation of pads, lands or terminals of component, e.g. radial or polygonal orientation
• CPC Class Codes: H05K 2201/097 Alternating conductors, e.g. alternating different shaped pads, twisted pairs; Alternating components
• CPC Class Codes: H05K 2201/10053 Switch

Abstract

An electrode of a self-capacitive touch panel is provided. The electrode, coupled to a control circuit of the self-capacitive touch panel via a conducting wire, includes: a serpentine portion, having a first side; a main portion, having a second side; and a connecting portion, connected to the first side and the second side to connect the serpentine portion and the main portion. A length of the connecting portion is smaller than a length of the first side and a length of the second side.

Claims

1. An electrode of a self-capacitive touch panel, coupled to a control circuit of the self-capacitive touch panel, the electrode comprising:

a main portion; and

a serpentine portion, coupled to the main portion, comprising a serpentine trace;

wherein, the serpentine portion increases a resistance of the electrode corresponding to the control circuit through the serpentine trace.

2. The electrode of a self-capacitive touch panel according to claim 1, wherein the serpentine portion comprises a plurality of parallel sub-traces.

3. The electrode of a self-capacitive touch panel according to claim 2, wherein widths of the sub-traces are substantially equal, and a total length of the sub-traces is associated with the resistance of the electrode corresponding to the control circuit.

4. The electrode of a self-capacitive touch panel according to claim 2, wherein gaps between the sub-traces are substantially equal.

5. The electrode of a self-capacitive touch panel according to claim 2, wherein the self-capacitive touch panel further comprises another electrode adjacent to the electrode and coupled to the control circuit, the another electrode comprises another serpentine portion, and a height of the serpentine portion is substantially equal to a height of the another serpentine portion.

6. The electrode of a self-capacitive touch panel according to claim 5, wherein the another serpentine portion comprises a plurality of another parallel sub-traces, widths of the another sub-traces are substantially equal to the widths of the sub-traces, and gaps between the another sub-traces are substantially equal to the gaps between the sub-traces.

7. The electrode of a self-capacitive touch panel according to claim 1, wherein the self-capacitive touch panel comprises a capacitor, the resistance of the electrode and the capacitor form a low-pass filter (LPF), and a cut-off frequency of the low-pass filter (LPF) is determined by adjusting the resistance of the electrode to filter out surges.

8. The electrode of a self-capacitive touch panel according to claim 1, further comprising another serpentine portion, wherein the another serpentine portion is connected to the main portion while not connected to the serpentine portion.

9. An electrode of a self-capacitive touch panel, coupled to a control circuit of the self-capacitive touch panel, the electrode comprising:

a serpentine portion, having a first side;

a main portion, having a second side; and

a connecting portion, connected to the first side and the second side to connect the serpentine portion and the main portion;

wherein, a length of the connecting portion is smaller than lengths of the first side and the second side.

10. The electrode of a self-capacitive touch panel according to claim 9, wherein the first side and the second side are parallel.

11. The electrode of a self-capacitive touch panel according to claim 9, wherein the serpentine portion comprises a serpentine trace.

12. The electrode of a self-capacitive touch panel according to claim 11, wherein the serpentine trace comprises a plurality of sub-traces.

13. The electrode of a self-capacitive touch panel according to claim 12, wherein widths of the sub-traces are substantially equal, and a total length of the sub-traces is associated with a resistance of the electrode corresponding to the control circuit.

14. The electrode of a self-capacitive touch panel according to claim 12, wherein gaps between the sub-traces are substantially equal.

15. The electrode of a self-capacitive touch panel according to claim 14, wherein the self-capacitive touch panel further comprises another electrode adjacent to the electrode and coupled to the control circuit of the self-capacitive touch panel, the another electrode comprises another serpentine trace, and a height of the another serpentine trace is substantially equal to a height of the serpentine trace.

16. The electrode of a self-capacitive touch panel according to claim 15, wherein the another serpentine trace comprises a plurality of another sub-traces, widths of the another sub-traces are substantially equal to the width of the sub-traces, and gaps between the another sub-traces are substantially equal to gaps between the sub-traces.

17. The electrode of a self-capacitive touch panel according to claim 9, wherein the self-capacitive touch panel comprises a capacitor, a resistance of the electrode and the capacitor form an LPF, and a cut-off frequency of the low-pass filter (LPF) is determined by adjusting the resistance of the electrode to filter out surges.

18. The electrode of a self-capacitive touch panel according to claim 9, further comprising another serpentine trace, and the another serpentine trace is connected to the main portion while not connected to the serpentine portion.