公开(公告)号：US08674709B2

公开(公告)日：2014-03-18

申请号：US13106411

申请日：2011-05-12

申请人： Ji Hun Kim ,  Hyun Min Song ,  Joon Ho Na ,  Ki Uk Gwak ,  Sang Gug Lee

发明人： Ji Hun Kim ,  Hyun Min Song ,  Joon Ho Na ,  Ki Uk Gwak ,  Sang Gug Lee

IPC分类号： G01R27/26

CPC分类号： G06F3/044

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.

摘要翻译： 用于测量触摸屏的电容值的电路包括：目标电容器单元，其具有充电目标充电电压的目标电容; 目标电压控制单元，用于对目标电容器充电; 具有充电了充电参考电压的参考电容器的参考电容器单元; 参考电压控制单元，用于对参考电容器充电; 比较器，用于比较目标充电电压和充电参考电压，并在目标充电电压变得高于充电参考电压的时刻输出转换信号; 以及控制器，用于接收比较器的输出信号和时钟信号，并产生数字输出信号和控制信号，其中使用从目标电容器初始化的时间起经过的时间来测量目标电容器的电容值 输出转换信号的时间。

公开(公告)号：US20110279131A1

公开(公告)日：2011-11-17

申请号：US13106411

申请日：2011-05-12

申请人： Ji-Hun KIM ,  Hyun-Min SONG ,  Joon-Ho NA ,  Ki-Uk GWAK ,  Sang-Gug LEE

发明人： Ji-Hun KIM ,  Hyun-Min SONG ,  Joon-Ho NA ,  Ki-Uk GWAK ,  Sang-Gug LEE

IPC分类号： G01R27/26

CPC分类号： G06F3/044

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.

摘要翻译： 用于测量触摸屏的电容值的电路包括：目标电容器单元，其具有充电目标充电电压的目标电容; 目标电压控制单元，用于对目标电容器充电; 具有充电了充电参考电压的参考电容器的参考电容器单元; 参考电压控制单元，用于对参考电容器充电; 比较器，用于比较目标充电电压和充电参考电压，并在目标充电电压变得高于充电参考电压的时刻输出转换信号; 以及控制器，用于接收比较器的输出信号和时钟信号，并产生数字输出信号和控制信号，其中使用从目标电容器初始化的时间起经过的时间来测量目标电容器的电容值 输出转换信号的时间。