Because the clamp effect of DC voltage source, AC side output the rectangular wave voltage waveform, and it has nothing to do with the load impedance Angle.
由于直流电压源的钳位作用，交流侧输出电压波形为矩形波，并且与负载阻抗角无关。
The source generates a rectangular wave voltage according to a first control, and applies the voltage to at least one organic electroluminescent element, thereby driving the element.
方波电压源，根据第一控制产生方波电压且将所述电压施加在至少一个有机电致发光元件上，以驱动所述元件；
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