- Active matrix addressing
Active matrix addressing is an
addressing schemeused in video displays. Given a "m" × "n" matrix, the number of connectors needed to address the display is "m" + "n".
pixelis attached to a switch-device, which "actively" maintains the pixel state while other pixels are being addressed, which also prevents crosstalkfrom inadvertently changing the state of an unaddressed pixel. The most common switching devices are Thin Film Transistors (TFT), i.e. a FET based on either the cheaper non-crystalline thin-film silicon(a-Si), polycrystallinesilicon (poly-Si), or CdSe semiconductormaterial. The latter is rarely used any longer in favour of the former two.
Another variant is to use diodes or resistors, but neither
diodes (e.g. Metal insulator metal diodes), nor non-linear voltage dependent resistors (i.e. varistors) are currently used. The latter of these is not yet economical when compared to TFT.
passive matrix addressing, pixel geometry, LCD
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