发明名称 |
CIRCUIT AND METHOD FOR MEASURING CAPACITANCE VALUE OF TOUCH SCREEN |
摘要 |
A circuit for measuring a capacitance value of a touch screen includes: a target capacitor unit having a target capacitor charged with a target charging voltage; a target voltage control unit to charge the target capacitor; a reference capacitor unit having a reference capacitor charged with a charging reference voltage; a reference voltage control unit to charge the reference capacitor; a comparator to compare the target charging voltage and the charging reference voltage and output a transition signal at a moment when the target charging voltage becomes higher than the charging reference voltage; and a controller to receive an output signal of the comparator and a clock signal and generate a digital output signal and a control signal, wherein a capacitance value of the target capacitor is measured using a time elapsed from a time when the target capacitor is initialized to a time when the transition signal is outputted.
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申请公布号 |
US2011279131(A1) |
申请公布日期 |
2011.11.17 |
申请号 |
US201113106411 |
申请日期 |
2011.05.12 |
申请人 |
KIM JI-HUN;SONG HYUN-MIN;NA JOON-HO;GWAK KI-UK;LEE SANG-GUG;SILICON WORKS CO., LTD |
发明人 |
KIM JI-HUN;SONG HYUN-MIN;NA JOON-HO;GWAK KI-UK;LEE SANG-GUG |
分类号 |
G01R27/26 |
主分类号 |
G01R27/26 |
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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