Touchscreen with overlapping floating transparent conductive islands
AssigneeElo Touch Solutions, Inc.
InventorsJoel Kent, Gazi Ali, Khalid Azim
Life of this patent
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Abstract
Various configurations and arrangements for touchscreens are disclosed to accommodate for one or more optical discontinuities that can be present within these touchscreens. When the one or more optical discontinuities are present, these configurations and arrangements of the touchscreens present a single layer of transparent conductive material that can be difficult to perceive by a human eye when viewing the touchscreens. Additionally, various edge correction techniques are disclosed to adjust mutual capacitances along a perimeter of the touchscreens. These edge correction techniques adjust mutual capacitances such that the values of the mutual capacitances are substantially uniform throughout.
Claims12
A touchscreen, comprising:
- a transparent substrate;
- a first layer of electrode patterns disposed on the transparent substrate, the first layer of electrode patterns comprising:
- a first electrode and a first floating transparent conductive island adjacent to the first electrode, an electrode terminus of a third electrode, and a third floating transparent conductive island adjacent to the electrode terminus;
- a second layer of electrode patterns comprising a second electrode and a second floating transparent conductive island adjacent to the second electrode, wherein the second floating transparent conductive island overlaps the electrode terminus and the third floating transparent conductive island;
- and
- an edge pattern element configured to adjust an edge mutual capacitance between the electrode terminus and the second electrode, wherein the edge pattern element comprises a grounded electrode adjacent to an edge boundary of the electrode terminus, wherein the grounded electrode is electrically connected to ground without capacitive coupling.
A method for fabricating a touchscreen, comprising:
- disposing on a first transparent substrate a first pattern comprising:
- a first electrode, a first floating transparent conductive island adjacent to the first electrode, an electrode terminus of a third electrode, and a third floating transparent conductive island adjacent to the electrode terminus;
- and
- disposing on a second transparent substrate a second pattern comprising:
- a second electrode, and a second floating transparent conductive island located adjacent to the second electrode, wherein the second floating transparent conductive island overlaps the electrode terminus and the third floating transparent conductive island,
- wherein the touchscreen further comprises an edge pattern element configured to adjust an edge mutual capacitance between the electrode terminus and the second electrode, wherein the edge pattern element comprises a grounded electrode adjacent to an edge boundary of the electrode terminus with interconnect traces for grounding the grounded electrode.
Dependencies are inferred from the claim text.