Patent ID: 7148881

Claim:
An apparatus for increasing the sensing accuracy of a touch sensor comprising: a transparent or translucent substrate; a conductive film very thinly coated on the upper surface of the substrate; a plurality of resistor elements consisting of conductive material, each resistor element being in a linear shape parallel to an edge of said substrate printed in at least one or more than one row and in a discontinuous manner, on the upper surface of the conductive film at the perimeter thereof, wherein adjacent ends of individual resistor elements are joined at the junctions at or near the four corners by wires, and wherein first gaps are formed between each independent row of resistor elements; a plurality of insulator elements, each insulator element being in linear shape parallel to an edge of said substrate discontinuously formed by removing a part of the conductive film near the inner side of the resistor elements on the surface thereof, the removed portions thus forming the insulator elements which are arranged in at least more than one row, on the inner side of the resistor elements; and a plurality of second gaps formed between each row of the plurality of insulator elements; wherein additional resistor elements and insulator elements are provided in a middle row between the inner arranged insulator elements and the outer-arranged resistor elements, the additional insulator elements located at the corners being preferably L-shape, and wherein additional first and second gaps are formed thereby for compensating and correcting the electrical field effect in this area, so as to further correct the equipotential lines in the middle row of additional resistor elements and insulator elements to generally straight lines.