US 8,507,800 B2 · Capacitive touch panel having dual resistive layer

Abstract

A patterned substrate for a touch screen sensor assembly that includes a plurality of electrodes that are formed from a first transparent conductive layer that has a first surface resistivity. The substrate also has a plurality of traces that may be used to couple the electrodes controller associated with the touch screen sensor assembly. The traces are formed from a second conductive layer that has a second surface resistivity that is less than the surface resistivity of the first conductive layer. The first and second conductive layers may be formed from indium tin oxide (ITO) having different surface resistivities. A second, similarly configured substrate can be provided and may be spaced apart from the first substrate by a dielectric spacer.

Claims16

Dependent claims

A patterned substrate for use in a capacitive touch screen sensor assembly, the patterned substrate comprising;

a substrate;
a first non-metallic conductive layer disposed on the substrate, the first non-metallic conductive layer forming a pattern of electrodes;
and
a second non-metallic conductive layer disposed on the substrate, the second non-metallic conductive layer forming a pattern of traces that are each electrically coupled to at least one of the electrodes;
wherein the second non-metallic conductive layer has a surface resistivity that is less than that of the first non-metallic conductive layer, and wherein the second non-metallic conductive layer has a surface resistivity of less than 20 ohms;
and
a flexible printed circuit (FPC) including an FPC substrate and a plurality of traces on a surface of the FPC substrate that are electrically coupled to the traces of the substrate formed by the second non-metallic conductive layer.

4 more elements

A capacitive touch screen sensor assembly, comprising:

first and second substrates disposed in parallel with each other with a space therebetween, each of the first and second substrates including:
a first non-metallic conductive layer disposed on the substrate, the first non-metallic conductive layer forming a pattern of electrodes;
and
a second non-metallic conductive layer disposed on the substrate, the second non-metallic conductive layer forming a pattern of traces that are each electrically coupled to at least one of the electrodes, wherein the second non-metallic conductive layer has a surface resistivity that is less than that of the first non-metallic conductive layer, and wherein contact of an object over one of the first and second substrates causes a capacitive change between the first non-metallic conductive layers of the first and second substrates;
and
a flexible printed circuit (FPC) including an FPC substrate, a first plurality of traces on a first surface of the FPC substrate that are electrically coupled to the traces of the first substrate formed by the second non-metallic conductive layer, and a second plurality of traces on an opposed second surface of the FPC substrate that are electrically coupled to the traces of the second substrate formed by the second non-metallic conductive layer.

3 more elements

Dependencies are inferred from the claim text.

Capacitive touch panel having dual resistive layer

Life of this patent

Capacitive touch panel having dual resistive layer

Life of this patent

Abstract

Claims16