Capacitive touch screen

• US 9,383,869 B1
• Filed: 01/10/2014
• Issued: 07/05/2016
• Est. Priority Date: 03/29/2009
• Status: Active Grant

• Current Assignee: Parade Technologies, Ltd.
• Original Assignee: Parade Technologies, Ltd.
• Inventors: Polishchuk, Igor, Grivna, Edward L.
• Primary Examiner(s): Giesy, Adam R
• Application Number:
  US14/152,882
• Time in Patent Office: 907 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

Abstract

An embodiment of a capacitive touch screen may comprise a display device comprising a substantially transparent substrate, a first plurality of electrodes attached to the substantially transparent substrate, wherein the first plurality of electrodes are substantially parallel in a first direction, and a second plurality of electrodes, wherein each of the second plurality of electrodes is capacitively coupled with each of the first plurality of electrodes.

Claims

1. A capacitive touch screen comprising:

a display device comprising a functional display element attached to a substantially transparent substrate;

a first plurality of electrodes attached to the substantially transparent substrate, wherein the first plurality of electrodes are substantially parallel in a first direction and are aperiodically spaced from each other; and

a second plurality of electrodes, wherein each of the second plurality of electrodes crosses each of the plurality of first electrodes and each of the second plurality of electrodes is configured to capacitively couple with each of the first plurality of electrodes.

2. The capacitive touch screen of claim 1, wherein the second plurality of electrodes are aperiodically spaced from each other.

3. The capacitive touch screen of claim 1, wherein the first plurality of electrodes is attached to a first side of the substantially transparent substrate opposite a second side of the substantially transparent substrate on which the functional display element is attached.

4. The capacitive touch screen of claim 1, wherein each of the first plurality of electrodes is made from a substantially transparent conductive material.

5. The capacitive touch screen of claim 1, wherein the second plurality of electrodes is attached to the same side of the substantially transparent substrate as the first plurality of electrodes.

6. The capacitive touch screen of claim 1, wherein each of the second plurality of electrodes is substantially perpendicular to each of the first plurality of electrodes.

7. A capacitive touch screen comprising:

a display device;

a functional display element attached to a substantially transparent substrate overlaying a viewable area of the display device;

a first plurality of electrodes attached to a side of the substantially transparent substrate opposite the display device, wherein the plurality of electrodes are substantially parallel in a first direction and are aperiodically spaced from each other; and

a second plurality of electrodes, wherein each of the electrodes of the second plurality of electrodes crosses each of the electrodes of the first plurality of electrodes and each of the electrodes of the second plurality of electrodes is configured to capacitively couple with each electrode of the first plurality of electrodes.

8. The capacitive touch screen of claim 7, wherein the second plurality of electrodes are aperiodically spaced from each other.

9. The capacitive touch screen of claim 7, wherein the first plurality of electrodes is attached to a first side of the substantially transparent substrate opposite a second side of the substantially transparent substrate on which the functional display element is attached.

10. The capacitive touch screen of claim 7, wherein each of the first plurality of electrodes is made from a substantially transparent conductive material.

11. The capacitive touch screen of claim 7, wherein the second plurality of electrodes is attached to the same side of the substantially transparent substrate as the first plurality of electrodes.

12. The capacitive touch screen of claim 7, wherein each electrode of the second plurality of electrodes is substantially perpendicular to each electrode of the first plurality of electrodes.

13. A method of forming a capacitive touch screen, comprising:

depositing a first conductive material layer over a substantially transparent substrate of a display device, wherein a functional display element is attached to at least one side of the substantially transparent substrate;

patterning the first conductive material layer to form a first plurality of electrodes, wherein the first plurality of electrodes are substantially parallel and are aperiodically spaced from each other; and

constructing a second plurality of electrodes coupled with the display device, wherein each electrode of the second plurality of electrodes crosses each electrode of the plurality of first electrodes and each electrode of the second plurality of electrodes is configured to capacitively couple with each electrode of the first plurality of electrodes.

14. The method of claim 13, wherein the second plurality of electrodes are aperiodically spaced from each other.

15. The method of claim 13, wherein the first plurality of electrodes is attached to a first side of the substantially transparent substrate opposite a second side of the substantially transparent substrate on which the functional display element is attached.

16. The method of claim 13, wherein each of the first plurality of electrodes is made from a substantially transparent conductive material.

17. The method of claim 13, wherein the second plurality of electrodes is attached to the same side of the substantially transparent substrate as the first plurality of electrodes.

18. The method of claim 13, wherein each of the second plurality of electrodes is substantially perpendicular to each of the first plurality of electrodes.

19. The method of claim 13, wherein constructing the second plurality of electrodes comprises depositing a second conductive material layer over the first plurality of electrodes.

20. The method of claim 13 further comprising, between depositing the first conductive material layer and constructing the second plurality of electrodes, depositing a dielectric material over the first plurality of electrodes.