Evaluation Of Large-Sized Lcd Touch Panel Using Differential Sensing Circuit And Algorithm
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS(2014)
摘要
In this letter, we evaluate the parasitic capacitance of an LCD touch panel, the description and implementation of a differential input sensing circuit, and an algorithm suitable for large LCDs with integrated touch function. When projected capacitive touch sensors are integrated with a liquid crystal display, the sensors have a very large amount of parasitic capacitance with the display elements. A differential input sensing circuit can detect small changes in the mutual capacitance from the touch of a finger. The circuit is realized using discrete components, and for the evaluation of a large-sized LCD touch panel, a printed circuit board touch panel is used.
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关键词
touch, LCD, capacitive touch, differential sensing, large-sized LCD touch panel
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