Algorithmic compensation system and method therefor for a touch sensor panel
AssigneeElo TouchSystems, Inc.
InventorsJoe Henry Babb, Geoffrey D. Wilson
Life of this patent
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Abstract
A general method is described for producing an inexpensive touchscreen system that provides accurate positional information and compensates for manufacturing variations without complicated sensor arrangements. Utilizing a set of sensed signals that are unique to each location on the touchscreen sensor, equations for X and Y are derived via curve fitting methods. The coefficients of the equations are stored with the sensor. During touchscreen operation the coefficients are used to calculate X and Y to the desired accuracy directly and independently.
Claims51
A system for relating a plurality of input values, each being responsive to and varying smoothly over a range of positions of a condition, with coordinate positions of the condition over a surface of a medium, comprising:
- (a) a plurality of inputs receiving a set of input values produced in response to a condition at a coordinate position on the surface of the medium;
- and
- (b) a memory for storing information relating to a mapping relationship of the plurality of input values to a coordinate position of the condition, said stored information including information derived for said medium and set of inputs from empirical observation, to account for an actual configuration of said medium and set of inputs.
A method for relating a set including a plurality of input values, each being responsive to and varying smoothly over a range of positions of a condition, with coordinate positions of the condition over a surface, comprising the steps of:
- (a) providing sets of measured input values produced at a plurality of distinct determined coordinate positions;
- and
- (b) processing the sets of measured input values in conjunction with the respective distinct coordinate positions thereof to derive a multidimensional mapping relation, the mapping relation relating a set of input values with an associated coordinate position.
Dependencies are inferred from the claim text.