Capacitive Sensor Coupling Correction
First Claim
1. A method of normalizing the effects of parasitic coupling in a touch sensor panel, the method comprising:
- stimulating a drive structure;
detecting a signal at a sense structure in response to stimulating the drive structure; and
correcting the signal by utilizing a set of correctional coefficients, wherein the set of correctional coefficients is based at least in part upon a set of previously sensed signals.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and apparatus for normalizing the effects of the changes to the parasitic capacitive coupling that can occur in touch sensor panels so as to reduce or eliminate the appearance of erroneous touch events. In some embodiments, at some time prior to regular device use (e.g. during factory calibration), a conductive sheet is initially positioned so as to entirely cover a touch surface of a touch sensor panel. A set of sensed signals may be determined upon driving the drive lines and sensing the sense lines of the panel. Correctional coefficients may then be calculated based in part upon the difference between a sensed signal and an expected signal. The correctional coefficients may then be stored in the device and used to determine signal corrections for a set of measured signals during normal operation.
-
Citations
29 Claims
-
1. A method of normalizing the effects of parasitic coupling in a touch sensor panel, the method comprising:
-
stimulating a drive structure; detecting a signal at a sense structure in response to stimulating the drive structure; and correcting the signal by utilizing a set of correctional coefficients, wherein the set of correctional coefficients is based at least in part upon a set of previously sensed signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. An apparatus adapted to normalize the effects of parasitic coupling, the apparatus comprising:
-
a memory unit adapted to store data, a first module adapted to stimulate a set of drive structures; a second module adapted to sense a signal for each drive structure stimulated; and a third module adapted to correct a signal by utilizing a set of correctional coefficients, wherein at least one correctional coefficient depends upon an expected signal and a set of sensed signals. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
-
27. A mobile phone comprising an apparatus adapted to normalize the effects of parasitic coupling, the apparatus comprising:
-
a memory unit adapted to store data; a first module adapted to stimulate a set of drive structures; a second module adapted to sense a signal for each drive structure stimulated; and a third module adapted to correct a signal by utilizing a set of correctional coefficients, wherein at least one correctional coefficient depends upon an expected signal and a set of sensed signals.
-
-
28. A digital media player comprising an apparatus adapted to normalize the effects of parasitic coupling, the apparatus comprising:
-
a memory unit adapted to store data; a first module adapted to stimulate a set of drive structures; a second module adapted to sense a signal for each drive structure stimulated; and a third module adapted to correct a signal by utilizing a set of correctional coefficients, wherein at least one correctional coefficient depends upon an expected signal and a set of sensed signals.
-
-
29. A personal computer comprising an apparatus adapted to normalize the effects of parasitic coupling, the apparatus comprising:
-
a memory unit adapted to store data; a first module adapted to stimulate a set of drive structures; a second module adapted to sense a signal for each drive structure stimulated; and a third module adapted to correct a signal by utilizing a set of correctional coefficients, wherein at least one correctional coefficient depends upon an expected signal and a set of sensed signals.
-
Specification