Capacitive touch screen

• US 8,638,310 B1
• Filed: 04/12/2012
• Issued: 01/28/2014
• Est. Priority Date: 03/29/2009
• Status: Active Grant

• Current Assignee: Parade Technologies, Ltd.
• Original Assignee: Cypress Semiconductor Corporation (Infineon Technologies AG)
• Inventors: Polishchuk, Igor, Grivna, Edward
• Primary Examiner(s): GIESY, ADAM
• Application Number:
  US13/445,747
• Time in Patent Office: 656 Days
• Field of Search: None
• US Class Current: 345/173
• 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;

a pattern through which visible light emitted by the functional display does not pass, wherein each of the first plurality of electrodes are aligned within or positioned over one or more portions of the pattern; 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 functional display element comprises the pattern, wherein the pattern comprises a mask pattern attached to the substantially transparent substrate.

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 each gap between the first plurality of electrodes is less than or equal to 10 micrometers.

6. 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.

7. 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.

8. The capacitive touch screen of claim 1, further comprising a solid layer of light altering material formed between one of the first plurality of electrodes and a corresponding one of the second plurality of electrodes.

9. 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 said substantially transparent substrate opposite the display device, wherein said plurality of electrodes are substantially parallel in a first direction;

a pattern through which visible light emitted by the functional display does not pass, wherein the each of the first plurality of electrodes are aligned within or positioned over one or more portions of the pattern; 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.

10. The capacitive touch screen of claim 9, wherein the functional display element comprises the pattern and the pattern comprises a mask pattern.

11. The capacitive touch screen of claim 9, 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.

12. The capacitive touch screen of claim 9, wherein a gap between each of the first plurality of electrodes is less than or equal to 10 micrometers.

13. The capacitive touch screen of claim 9, wherein the second plurality of electrodes is attached to the same side of the substantially transparent substrate as the first plurality of electrodes.

14. The capacitive touch screen of claim 9, wherein each of the second plurality of electrodes is substantially perpendicular to each of the first plurality of electrodes.

15. The capacitive touch screen of claim 9, further comprising a solid layer of light altering material formed between one of the first plurality of electrodes and a corresponding one of the second plurality of electrodes.

16. A method 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;

patterning a mask configured to block visible light emitted by the functional display element, wherein the patterning of the first conductive material layer includes forming each of the first plurality of electrodes in alignment with, or positioned over, one or more portions of the mask; and

constructing a second plurality of electrodes coupled with the display device, 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.

17. The method of claim 16, further comprising depositing a light altering material layer over said conductive material layer.

18. The method of claim 17, wherein the light altering material layer is a light absorbing material.

19. The method of claim 16, wherein constructing the second plurality of electrodes comprises depositing a second conductive material layer over the first plurality of electrodes.