A method and apparatus for selectively exciting a matrix of voltage responsive devices in which each of said device is responsive to a voltage difference between a row and column drive line. A plurality of row and column drive lines are fed with an AC voltage, the phases of said voltage on said column drive lines being different from the phases on said row drive lines. A device is selectively excited by adjusting the phase of voltage on the row and column drive lines, associated with said selected device, to be equal to each other, and different from either the phases on other column or other row drive lines. The three different phases of voltage available (one on unselected columns, another on unselected rows, the third on the selected row and column) differ in increments of 2 pi /3. In this manner the voltage across a selected device can be reduced to zero without affecting the amplitude of voltage applied to any other device.
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机译：一种用于有选择地激励电压响应设备矩阵的方法和装置，其中每个所述设备都响应行和列驱动线之间的电压差。多个行和列驱动线被馈有AC电压，所述列驱动线上的所述电压的相位不同于所述行驱动线上的相位。通过将与所述所选设备相关联的行和列驱动线上的电压相位调整为彼此相等并且不同于其他列或其他行驱动线上的相位来选择性地激励设备。可用电压的三个不同阶段（一个在未选择的列上，另一个在未选择的行上，第三个在选择的行和列上）相差2 pi / 3。以这种方式，可以将所选设备两端的电压降低到零，而不会影响施加到任何其他设备的电压幅度。
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