Display addressing scheme: Difference between revisions

Revision as of 23:50, 3 February 2005

Revision as of 23:56, 21 December 2005

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==Matrix addressing==

A '''matrix addressed''' display runs control signals only to the rows and columns of the display. (See also: [[Matrix (mathematics)|matrix]]) For a screen size of ''m''×''n'' pixels, this scheme would require ''m''+''n'' control signals. When a row and column are activated, only the pixel at the intersection of the row and column is addressed. In this scheme only a single pixel can have its state set or maintained at any one time, which means that the state of the pixel must persist without a control signal during the time which other pixels are being addressed. This persistancepersistence can be accomplished through [[active matrix addressing]], [[passive matrix addressing]], or the persistancepersistence of vision of the (usually human) eye. PersistancePersistence of vision is used in simpler, slower changing displays such as clocks.

==Raster addressing==

A '''raster addressed''' display (e.g., a [[CRT]]) works by scanning across the entire display in sequence while modulating control signal to activate each pixel as it is scanned. This display uses persistancepersistence of the pixel element (e.g., [[phosphor]]) to maintain the pixel state until the scan can visit that pixel again. There are are only three control signals required for this to work: a horizontal scan control signal, a vertical scan control signal, and an intensity control signal. Timing between these signals is very important, else the image on the screen will show artifacts.

[[Category:Display technology]]