Systems and methods for detecting multiple touch points in surface-capacitance type touch panels

摘要

Surface-capacitance-based multi-touch touch panel apparatus including a multiplicity of electrically conductive shapes e.g. diamonds arranged along at least one of rows and columns whose capacitance is measured by capacitive sensors; wherein the rows and columns include a set of linear arrays including at least one individual linear array which includes a plurality of first sets of shapes, each first set including n>=1 shapes all shorted to a single set-specific capacitive sensor such that no two first sets are both shorted to a common capacitive sensor.

主权项

1. Surface-capacitance-based multi-touch touch panel apparatus including:
a. A touch panel having dimensions L, K respectively along first and second axes respectively and including a multiplicity of electrically conductive shapes, the touch panel including:
i. At least one row touch surface comprising a subset of said multiplicity of shapes arranged in a row along said first axis wherein all shapes in said subset are connected to a row-specific capacitive sensor; andii. A plurality of approximate position indicative touch surfaces, wherein each approximate position indicative touch surface's dimensions along the first and second axes respectively are less than L and K respectively, and wherein said plurality of approximate position indicative touch surfaces are respectively uniquely connected to a respective plurality of approximate position indicative capacitive sensors; and b. A response analyzer operative to identify an approximate location of each touch along both of said axes, based on at least one response obtained from at least one of said approximate position indicative touch surfaces, to refine at least one component, along at least one of said first and second axes, of said approximate location using at least one response obtained from said at least one row touch surface, and to output a refined location for said touch along both of said axes, accordingly.