Interpolation of position of a stylus in a touch sensor

摘要

Systems and methods for determining interpolation functions for a stylus position on a sensor matrix and estimating such a position are provided. In one disclosed embodiment, a test apparatus comprises a stylus configured to be positioned on a sensor matrix at each location of a set of known locations. One or more processors are configured to access the touch sensor data corresponding to the set of known locations, where the data is produced in response to positioning the stylus on the sensor matrix at the set of known locations. Stylus location data reflecting the set of known locations is accessed. A stylus position interpolation function is then determined by curve fitting based on the touch sensor data corresponding to the set of known locations and the stylus location data reflecting the set of known locations.

主权项

1. A system comprising:
a test apparatus comprising a stylus that is configured to be positioned on a sensor matrix to enable the stylus to be automatically positioned at each location of a set of known locations on the sensor matrix; and one or more processors configured to:
access the touch sensor data corresponding to the set of known locations on the sensor matrix, the touch sensor data produced in response to the test apparatus positioning the stylus on the sensor matrix at the set of known locations;access stylus location data reflecting the set of known locations;determine multiple different stylus position interpolation functions for each axis of the sensor matrix to produce multiple different estimates of a position of the stylus alone each axis of the sensor matrix by curve fitting based on the touch sensor data corresponding to the set of known locations and the stylus location data reflecting the set of known locations; andcombine the multiple different estimates to provide an estimate of a true position of the stylus alone each axis of the sensor matrix.