A class of design to promote the signal deviation for the Capacitive Touch key

• Main Authors: CHEN, TAI-HUNG, 陳泰虹
• Other Authors: Shieh-Shing Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/56098257479313848039

碩士 === 聖約翰科技大學 === 電機工程系碩士在職專班 === 101 === “Touch Key” is a kind of “indirect touch key” which is based on the principles of electronic signal & induction. It’s very popular and also a current trend in the consumer marking. Capacitance touch key is the main trend because of a high performance but low cost. Here is to canvass a new class design of Capacitive Sensing Touch Keys, and provide the ways to enhance the functions. According to the theory of "Capacitor Transient phenomenon or steady state", this work employs the way of “mutual capacitance” or “self capacitance” to present how to test the operations for indirect touch key. This work also finds a lot of relative theories and patents at present, most of them are to discussing the signal detections or how to get the stable and good signal. It’s rare to find the researches about the ways for the improvement of signal deviation ratio. This thesis is proposing a new PCB patent of indirect touch pad. Not only by the theoretical foundations but also with the experiment results to improve the shortcomings caused by the smaller signal deviation ratio on capacitive touch key.