发明名称 |
Touch pad and position detecting circuit and method thereof |
摘要 |
A touch pad and a position detecting circuit and method thereof are provided. The touch pad uses a waveform generator to generate an input signal; the input signal is capable of gradually moving a position of a zero voltage on the sensing pad in a predetermined direction. The touch pad also uses the zero voltage detector to detect when a zero voltage of the sensing signal of the sensing pen occurs so as to determine the position of the sensing pen on the sensing pad. Hence, the analog-to-digital converter is not required. Therefore, the resolution can be easily expanded, and the cost, the preciseness, and the specification can be easily controlled.
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申请公布号 |
US7312409(B2) |
申请公布日期 |
2007.12.25 |
申请号 |
US20040709262 |
申请日期 |
2004.04.26 |
申请人 |
SUNPLUS TECHNOLOGY CO., LTD. |
发明人 |
LO LIH-SHENG;HSU HUNG-TA;LIAO TUNG-TSAI |
分类号 |
G06F3/041;G06F3/045;G01R29/00;G06F3/03;G06F3/033;G06K11/06;G08C21/00 |
主分类号 |
G06F3/041 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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