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File:Ghost detections.png

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Summary

Description
English: Due to the fact that Self Capacitance only detects if a sensing conductor has been touched, when detecting three fingers, three x-axis readings and three y-axis readings are obtained. The three fingers can be at any of the 9 intersections of these axes . Three are true, and 6 are false ("ghosts" ) .

The true position of the three fingers can, however, be disambiguated by targeting Mutual Capacitance techniques at the 9 positions in contention . Only the true positions will give a touch reading.

This technique can be extended to four or more fingers.
Date
Source Own work
Author Touchscreen1

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Captions

Self Capacitance creates n^2 possible finger positions when detecting n fingers.

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19 May 2023

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current10:23, 19 May 2023Thumbnail for version as of 10:23, 19 May 20231,680 × 720 (28 KB)Touchscreen1Uploaded own work with UploadWizard
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