Capacitive touch screen including a first sensor pattern for mutual sensing and a second sensor pattern for self sensing

摘要

A capacitive touch panel includes a first sensor pattern and second sensor pattern. The first sensor pattern supports mutual-capacitance detection and the second sensor pattern supports self-capacitance detection. The first sensor pattern includes row conductors and column conductors which intersect each other at mutual-capacitance sensing locations. The second sensor pattern includes island conductors. The island conductors are grouped in clusters of conductors, each cluster providing a self-capacitance sensing location. Control circuitry coupled to the first and second sensor patterns functions to make touch/hover position detections by sensing changes in capacitance at the mutual-capacitance and self-capacitance nodes. The row and column conductors include openings, and the island conductors are positioned in vertical alignment with corresponding openings in the conductors.

主权项

1. An apparatus, comprising:
a capacitive touch panel including:
a first sensor pattern configured to solely operate in a mutual-capacitance detection mode of operation, the first sensor pattern comprising:
a plurality of rows of electrically connected sensor nodes; anda plurality of columns of electrically connected sensor nodes;wherein each sensor node in the rows and columns has a ring shape with a central open region; anda second sensor pattern configured to solely operate in a self-capacitance detection mode of operation; wherein said first and second sensor patterns are supported by a support substrate one pattern on top of the other pattern; wherein the second sensor pattern comprises a plurality of conductive islands, each conductive island positioned in vertical alignment perpendicular to the support substrate with the central open region of the sensor node; and wherein the plurality of conductive islands are divided into a plurality of clusters, each cluster including two or more conductive islands which are electrically connected to each other by one or more conductive lines.