Two-layer sensor stack
In one embodiment, an method apparatus includes an optically clear adhesive (OCA) layer between a cover sheet and a substrate. The substrate has drive or sense electrodes of a touch sensor disposed on a first surface and a second surface of the substrate. The first surface is opposite the second surface and the drive or sense electrodes are made of a conductive mesh of conductive material including metal.
1. An apparatus comprising:
a first optically clear adhesive (OCA) layer between a first cover sheet and a substrate;
the substrate, with drive or sense electrodes of a touch sensor disposed on a first surface and a second surface of the substrate, the first surface being opposite the second surface, the drive or sense electrodes being made of a conductive mesh conductive material comprising metal; and
a display separated from the second surface of the substrate by a second OCA and a second cover sheet such that at least a portion of the second cover sheet is positioned between the second surface of the substrate and the display.
2. The apparatus of claim 1 , wherein the conductive material is copper, silver, gold, aluminum, or tin.
3. The apparatus of claim 1 , wherein the conductive mesh comprises a plurality of mesh segments, each of the mesh segments having a width of approximately 10 μm.
4. The apparatus of claim 3 , wherein approximately 5% of an active area of the touch sensor is covered by the one or more mesh segments.
5. The apparatus of claim 3 , wherein each of the mesh segments is substantially sinusoidal.
6. The apparatus of claim 1 , wherein the conductive meshes have an optical transmissivity of approximately 90%.
7. The apparatus of claim 1 , wherein the sense electrodes being disposed on the first surface of the substrate and the drive electrodes being disposed on the second surface of the substrate.
8. A device comprising:
a first cover sheet;
a first optically clear adhesive layer (OCA) between the first cover sheet and a substrate;
the substrate, with drive or sense electrodes of a touch sensor disposed on a first surface and a second surface of the substrate, the first surface being opposite the second surface, the drive or sense electrodes being made of a conductive mesh conductive material comprising metal;
a display separated from the second surface of the substrate by a second OCA and a second cover sheet such that at least a portion of the second cover sheet is positioned between the second surface of the substrate and the display; and
one or more computer-readable non-transitory storage media embodying logic that is configured when executed to control the touch sensor.
9. The device of claim 8 , wherein the conductive material is copper, silver, gold, aluminum, or tin.
10. The device of claim 8 , wherein the conductive mesh comprises a plurality of mesh segments, each of the mesh segments having a width of approximately 10 μm.
11. The device of claim 10 , wherein approximately 5% of an active area of the touch sensor is covered by the mesh segments.
12. The device of claim 10 , wherein each of the mesh segments is substantially sinusoidal.
13. The device of claim 8 , wherein the conductive meshes have an optical transmissivity of approximately 90%.
14. The device of claim 8 , wherein the sense electrodes being disposed on the first surface of the substrate and the drive electrodes being disposed on the second surface of the substrate.
15. An apparatus comprising:
a first optically clear adhesive (OCA) layer between a first cover sheet and a substrate;
the substrate, with sense electrodes of a touch sensor disposed on a first surface and drive electrodes of the touch sensor disposed on a second surface of the substrate, the first surface being opposite the second surface, the drive and sense electrodes being made of a conductive mesh of conductive material comprising metal; and
a display separated from the second surface of the substrate by a second OCA and a second cover sheet such that at least a portion of the second cover sheet is positioned between the second surface of the substrate and the display.