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There are three different '''addressing schemes''' for [[display]]-devices; ''electronically'' or ''optically addressed displays'', or ''addressing by plasma columns''. Each teqnique allows a physical way of switching the [[pixel]] to a black-white or more usually gray-scale state.
'''Electronic and plasma schemes:''' Colour displays or the [[pixel geometry]] are actually implemented using three [[gray-scale]] component system making up one [[pixel]], and each component is followed with a [[primary colour]]-filter to separate the [[red]], [[green]] and [[blue]]. So the treatment simplifies since it is sufficient to consider only a pixel with ''N'' gray shades. The shade level is typically lineary dependent on the applied potential over the pixel, so each level will translate into a separation of say ''ΔV/N'' [[volt]]s per gray shade, where ''ΔV'' is the potential range that the pixel respons to. Each separation is typically some [[millivolt|mV]]. Since there is risk for a [[crosstalk|cross-talk]] at neighbouring pels, the addressing scheme must carefully be designed so that addressing a pixel does not affect other neighbours. If cross-talk occures, then the [[contrast]] is reduced.
'''Optical scheme:''' The image is not pixalized at all and it is transferred from the camera or the like directly onto the LCD-screen. The image is displayed in high resolution.
== Electronically addressing ==
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