Capacitive touch screen with conductive polymer
Assignee3M Innovative Properties Company
InventorsElisa M. Cross, Robert S. Moshrefzadeh, Frank J. Bottari, Darran R. Cairns, Anthony F. Chernefsky, Paul J. Richter
Life of this patent
Estimating the term…
Abstract
A capacitive touch screen is described with a touch area including a substantially transparent conductive polymer. The capacitive touch screen also includes circuitry connecting the conductive polymer of the touch area to a power source, where the circuitry is configured to determine a location of a capacitive coupling on the touch area.
Claims44
A capacitive touch screen comprising:
- a touch area comprising a substantially transparent conductive polymer acting as a primary signal carrier for making a capacitive coupling to an object at a touch location;
- and
- circuitry connecting the conductive polymer of the touch area to a power source, the circuitry configured to determine the touch location.
A touch panel for locating a touch point, comprising:
- a current-conducting impedance surface having at least a pair of boundaries, the impedance surface comprising a conductive polymer;
- wherein the touch panel is configured to cause a substantially linearized electrical current through the impedance surface, wherein currents passing through a touch point on the impedance surface from each of the boundaries determine a location of the touch point.
A touch sensitive display module comprising:
- a touch area comprising a substantially transparent conductive polymer acting as a primary signal carrier for making a capacitive coupling to an object at a touch location;
- circuitry connecting the conductive polymer of the touch area to a power source, the circuitry configured to determine the touch location;
- and
- a display device having a display surface.
A method of making a capacitive touch screen comprising:
- providing a substrate;
- forming a touch area on the substrate comprising a substantially transparent conductive polymer, wherein the conductive polymer is configured to act as a primary signal carrier for making a capacitive coupling to an object.
Dependencies are inferred from the claim text.