CAPACITIVE TOUCH SCREEN WITH TIME OVERLAPPED CONCURRENT SCANNING OPERATION USING CODED DRIVE SIGNALS
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United States of America Patent
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Issued Date -
Oct 27, 2016
app pub date -
Apr 22, 2015
filing date -
Apr 22, 2015
priority date (Note) -
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Abstract
A capacitive sensing system includes a capacitive sensing panel with drive lines and sense lines. Each drive line includes a drive circuit. A code generator operates to generate modulation codes. A drive controller generates drive signals wherein each drive signal is modulated by one of the modulation codes. The generated drive signals are applied to the drive lines through the drive circuits. The drive controller operates to simultaneously generate the drive signals for application to a corresponding group of drive lines during a drive period. Separate groups of drive lines are sequentially driven with the same drive signals during drive periods that only partially overlap.
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