High-Accuracy Touch Positioning for Touch Panels

摘要

Control circuitry for a touch panel includes a touch panel interface, a memory comprising touch positioning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the touch positioning logic is executed, to perform selected processing of the touch panel, including scanning a touch panel and determining a touch panel blob resulting from a touch, obtaining blob characteristics of the touch panel blob, and determining a position of the blob relative to the touch panel based on the blob characteristics. The blob characteristics can be adjusted to more accurately position the blob in circumstances where the blob is located near the edge of the touch panel, is in close proximity to another blob, or when the touch panel has variation in the received signal noise.

主权项

1. Control circuitry for a touch panel, the control circuitry comprising:
a touch panel interface; a memory comprising touch positioning logic; and a controller in communication with the memory and the touch panel interface, the controller configured, when the touch positioning logic is executed, to:
scan a touch panel;determine a first touch panel blob and a second touch panel blob from the scan;determine that the first touch panel blob and the second touch panel blob share a common member pixel;apportion capacitance of the common member pixel between the first touch panel blob and the second touch panel blob; anddetermine a position of the first touch panel blob, the second touch panel blob, or both, taking into consideration the capacitance that was apportioned between the first touch panel blob and the second touch panel blob.