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    • 1. 发明授权
    • Control circuit and control method for touch panel to determine coordinates touched by user
    • 触摸屏的控制电路和控制方法,以确定用户触摸的坐标
    • US09104286B2
    • 2015-08-11
    • US14479586
    • 2014-09-08
    • ROHM CO., LTD.
    • Naoki TadaShinichi AbeKoichi SaitoKazunori Hisa
    • G06F3/041G06F3/045
    • G06F3/045G06F3/0416G06F2203/04104
    • A first resistive film is arranged such that one edge thereof is connected to a first terminal, and an edge that is opposite to the aforementioned edge is connected to a second terminal. A second resistive film is arranged with a gap between it and the first resistive film such that one edge thereof is connected to a third terminal. A voltage generating unit applies a predetermined first bias voltage and a predetermined second bias voltage to the first terminal and the second terminal, respectively. A voltage detection unit detects a panel voltage that occurs at the third terminal. A current detection unit detects a panel current that flows through a path including the first terminal, the first resistive film, and the second terminal. A computation unit determines the coordinates touched by the user, based upon the values of the panel voltage and the panel current.
    • 第一电阻膜被布置成使得其一个边缘连接到第一端子,并且与上述边缘相对的边缘连接到第二端子。 第二电阻膜在其与第一电阻膜之间布置有间隙,使得其一个边缘连接到第三端子。 电压产生单元分别向第一端子和第二端子施加预定的第一偏置电压和预定的第二偏置电压。 电压检测单元检测在第三端子处发生的面板电压。 电流检测单元检测流过包括第一端子,第一电阻膜和第二端子的路径的面板电流。 计算单元基于面板电压和面板电流的值来确定用户触摸的坐标。
    • 3. 发明授权
    • Touch panel control circuit
    • 触摸屏控制电路
    • US09207803B2
    • 2015-12-08
    • US13961415
    • 2013-08-07
    • ROHM CO., LTD.
    • Shinichi Abe
    • G06F3/041G06F3/045
    • G06F3/0416G06F3/045G06F2203/04104
    • A voltage generating unit includes an output transistor arranged as a first-terminal side extension of a path that includes a first terminal, a first resistive film, and a second terminal, and is configured to apply a first bias voltage to the first terminal. A current detection unit includes a detection transistor connected to the output transistor such that they form a current mirror circuit, a detection resistor arranged on a path of the detection transistor, and an amplifier circuit configured to amplify the difference between a voltage drop across a detection resistor and a predetermined voltage, and to output the difference thus amplified as a value which represents a panel current.
    • 电压产生单元包括布置为包括第一端子,第一电阻膜和第二端子的路径的第一端侧延伸的输出晶体管,并且被配置为向第一端子施加第一偏置电压。 电流检测单元包括连接到输出晶体管的检测晶体管,使得它们形成电流镜电路,布置在检测晶体管的路径上的检测电阻器和放大器电路,该放大器电路被配置为放大检测电压之间的电压差 电阻器和预定电压,并且将由此放大的差值输出为表示面板电流的值。