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| {{Unreferenced|date=December 2009}}
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| '''Passive matrix addressing''' is an [[addressing scheme]] used in early [[LCD]] displays. This is a matrix addressing scheme meaning that only ''m'' + ''n'' control signals are required to address a ''m'' × ''n'' display. A [[pixel]] in a passive matrix must maintain its state without active driving circuitry until it can be refreshed again.
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| The [[Wiktionary:signal|signal]] is divided into a row or ''select signal'' and a column or ''video signal''. The select [[voltage]] determines the row that is being addressed and all ''n'' pixels on a row are addressed simultaneously. When [[pixels]] on a row are being addressed, a ''V<SUB>sel</SUB>'' potential is applied, and all other rows are unselected with a ''V<SUB>unsel</SUB>'' potential. The video signal or column potential is then applied with a potential for each ''m'' columns individually. An on-lighted [[pixel]] corresponds to a ''V<SUB>on</SUB>'', an off-switched corresponds to a ''V<SUB>off</SUB>'' potential.
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| The potential across [[pixel]] at selected row ''i'' and column ''j'' is
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| :<math>V_{ij} = V_{sel} - V_{on|off}</math> | |
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| :<math>V_{ij} = V_{unsel} - V_{on|off}</math>
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| for the unselected rows.
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| Passive matrix addressed displays such as [[ferroelectric]] [[liquid crystal display]]s do not need the switch component of an active matrix display because they have built-in [[bistability]]. Technology for [[electronic paper]] also has a form of bistability. Displays with bistable pixel elements are addressed with a passive matrix addressing scheme, whereas TFT LCD displays are addressed using [[active matrix addressing|active addressing]].
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| ==See also==
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| * [[Active matrix addressing]]
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| * [[Pixel geometry]]
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| * [[Liquid crystal display]]
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| {{DEFAULTSORT:Passive Matrix Addressing}}
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| [[Category:Digital imaging]]
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| [[Category:Liquid crystal displays]]
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Latest revision as of 03:41, 11 November 2014
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