Touch pattern structure of in-cell capacitive touch screen

• US 9,703,426 B2
• Filed: 11/19/2013
• Issued: 07/11/2017
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: Yao, Qijun, Wang, Lihua
• Primary Examiner(s): Boyd, Jonathan
• Application Number:
  US14/084,546
• Publication Number:
  US 20140078106A1
• Time in Patent Office: 1,330 Days
• Field of Search: 345174
• 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

Abstract

A touch pattern structure of an in-cell capacitive touch screen is disclosed. The touch pattern structure includes a plurality of driving lines in a first direction, the plurality of driving lines being insulated from each other, and a plurality of sensing lines in a second direction, the plurality of sensing lines being insulated from each other. The first direction intersects with the second direction, the driving lines are respectively insulated from the sensing lines, and a mutually-embedded structure is provided on at least a part of opposing sides of the driving lines and the sensing lines.

Claims

1. A touch pattern structure of an in-cell capacitive touch screen, comprising:

a plurality of driving lines in a first direction, wherein the plurality of driving lines is disposed in a first layer and insulated from each other;

a plurality of sensing lines in a second direction, wherein the plurality of sensing lines is disposed in the first layer and insulated from each other, wherein the plurality of sensing lines intersects the plurality of driving lines;

an insulating layer displaced on the first layer; and

a plurality of conductive bridges disposed on the insulating layer, each having two ends connecting two of the plurality of sensing lines at intercepting locations, wherein the plurality of conductive bridges is insulated from the driving lines;

wherein the touch pattern structure is integrated in a display panel of the in-cell capacitive touch screen;

wherein each driving electrode and each sensing electrode comprise teeth at least on one side, wherein the teeth of the driving electrodes interweave with the teeth of an opposing sensing electrode to form an intertwined structure;

wherein a pair of the interwoven teeth defines a repeating unit; and

wherein in a case each tooth is rectangular and the sensing electrode excluding the teeth is rectangular, a number of the teeth in the sensing electrode is greater than a value of L*(Y−

2A)/A*B, where Y is a width of the rectangular-shaped sensing electrode body, A is a width and B is a depth of the rectangular-shaped tooth and L is a length of a long side, of one of the plurality of driving electrodes.

2. The touch pattern structure according to claim 1, wherein the mutually-embedded structure has at least three repeating units.

3. The touch pattern structure according to claim 1, the value of (Sd×

Ss)/L is smaller with the teeth at the side of sensing lines than without teeth, where Ss is the area of a sensing electrode, Sd is the area of the driving electrode, L is the length of the side, opposing the sensing electrode, of the driving electrode.

4. The touch pattern structure according to claim 1, wherein in a case that each tooth of the sensing electrode substantially is triangular, the width of the electrode body of the sensing electrode is Z, a length of a bottom side of each triangular tooth is C and a height of the triangular tooth is D, and wherein C=0.2 mm and Z=0.4 mm, and D has an optimal value of 0.8 mm.

5. The touch pattern structure according to claim 1, wherein in a case that the sensing electrode excluding the teeth is a branch-shaped electrode body, and a width of each electrode branch is greater than 0.2 mm.

6. The touch pattern structure according to claim 2, wherein a virtual electrode is provided between one of the driving Wind lines and its corresponding sensing line, and wherein the virtual electrode is insulated from both of the driving line and the sensing line.

7. The touch pattern structure according to claim 6, wherein the driving line and the sensing electrode are covered by an insulating layer, wherein the sensing line comprises a conducting wire, wherein the conducting wire crosses the insulating layer to connect the sensing electrode, and wherein the virtual electrode is disposed between the driving electrode and the sensing electrode.

8. The touch pattern structure according to claim 6, wherein the driving line and the sensing line are respectively located on the upper side and the lower side of the insulating layer, and wherein the virtual electrode is disposed on the regions in the upper side and the lower side of the insulating layer excluding the driving line and the sensing line.

9. The touch pattern structure according to claim 6, wherein the geometry of the virtual electrode is polygon, circle or oval.

10. The touch pattern structure according to claim 7, wherein the geometry of the virtual electrode is polygon, circle or oval.

11. The touch pattern structure according to claim 8, wherein the geometry of the virtual electrode is polygon, circle or oval.

12. The touch pattern structure according to claim 1, wherein each of the driving line or the sensing line comprises at least one of a transparent conductive material, and a metal grid covered with black matrix.

13. The touch pattern structure according to claim 10, wherein the transparent conductive material comprises at least one of indium tin oxide, and indium zinc oxide.