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    • 1. 发明授权
    • Cross-point matrix for infrared touchscreen
    • 用于红外触摸屏的交点矩阵
    • US06961051B2
    • 2005-11-01
    • US10353645
    • 2003-01-29
    • Paul Fredrick Luther WeindorfDavid Ryan AndersonGregory J. Milne
    • Paul Fredrick Luther WeindorfDavid Ryan AndersonGregory J. Milne
    • G06F3/042G06F3/033G06F3/041H01L31/10G09G5/00
    • G06F3/0421
    • A circuit assembly detects a touch point within a display area. A plurality of light emitters are disposed around a periphery of the display area. A plurality of detectors are disposed around the periphery, each detector being opposed to a respective light emitter. Switching circuitry for connecting the light emitters and detectors in a switching matrix has a plurality of matrix rows and matrix columns. The switching circuitry includes a plurality of row lines, each row line corresponding to a respective matrix row and a plurality of column lines, each column line corresponding to a respective matrix column. Low-side switching transistors selectably couple the light emitters and detectors to the row and column lines, respectively. A common modulated signal is coupled to the anodes of all the light emitters. A detection signal is provided by connecting the collector terminals for the detector phototransistors in common. Consequently, high-side multiplexing circuits are avoided.
    • 电路组件检测显示区域内的触摸点。 多个发光体设置在显示区域的周围。 多个检测器设置在周边周围,每个检测器与相应的光发射器相对。 用于连接开关矩阵中的发光体和检测器的开关电路具有多个矩阵行和矩阵列。 开关电路包括多条行线,每条行线对应于相应的矩阵行和多条列线,每条列线对应于相应的矩阵列。 低侧开关晶体管分别将发光体和检测器分别耦合到行和列线。 公共调制信号耦合到所有发光体的阳极。 通过连接用于检测器光电晶体管的集电极端子来提供检测信号。 因此,避免了高端复用电路。