Talk:Passive matrix
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To explain better
[edit]LEDs by itself are unidirectional conductors, and diodes used in other displays, so pixels turn on only when there is a potential difference between row and column and it is positive (relative to the diode polarity).
LCDs operate on alternating voltage. It is unacceptable to feed them for longer time with same polarity because electrolysis will destroy the liquid crystal. For LCDs, the potentials are chosen so that Von>Vunsel>Voff>Vsel, then the potential difference on the enabled pixels of the active rows will be about three times greater than on the pixels of the other three possible row-column combinations. Periodically, the order of voltages is reversed (Von<Vunsel<Voff<Vsel) to avoid the aforementioned destructive effect. — Preceding unsigned comment added by 178.158.195.103 (talk) 21:34, 2 May 2022 (UTC)