TOUCH SENSE INTERVALS IN MULTIPLE DRIVE STATES

摘要

A touch sensor is provided having a matrix of row electrodes and column electrodes. Associated circuitry progressively drives the row electrodes in successive touch-sensing frames, and the resulting signals on the column electrodes are processed to detect touch events. In each interval of each touch-sensing frame, a different grouping of the row electrodes is driven. Within each interval, the associated grouping is driven in multiple differently-driven drive states. For a set of possible touch events associated with the row electrodes of the grouping, the drive states produce differing drive state outputs that collectively, but not individually, are usable to detect each of the different touch events.

主权项

1. A touch-sensitive display device, comprising:
a touch sensor having a matrix of row electrodes and column electrodes; receive circuitry attached to the column electrodes; drive circuitry configured to progressively drive the row electrodes during sequentially-occurring touch-sensing frames to influence electrical conditions on the column electrodes, the receive circuitry being configured to interpret such electrical conditions to detect touch events occurring on the matrix during the touch-sensing frames; where the drive circuitry is configured to, in each of a plurality of intervals in each of the touch-sensing frames, drive a different grouping of the row electrodes, such that only that grouping is driven during the interval; where the drive circuitry is configured to drive the row electrodes for a given grouping simultaneously in the interval in each of a plurality of differently-driven drive states, only one of which is used at a time during the interval; and where, for a set of possible touch events associated with the row electrodes of the grouping, the drive states produce differing drive state outputs that collectively, but not individually, are usable to detect each of the different touch events.