Display addressing scheme: Difference between revisions

Revision as of 13:12, 29 September 2019

Revision as of 05:19, 29 March 2021

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==Direct addressing==

A '''direct addressed''' display runs individual control signals to each pixel. This allows the state, whether on/off or grayscale, to be set and maintained on each pixel. For a screen size of ''m''××''n'' pixels, this scheme would require ''m''××''n'' control signals. This is generally considered to be an inefficient use of I/O and physical space.

==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. In [[active matrix addressing]], some sort of capacitor (external to the cell proper) is used to maintain the state of the cell. [[Passive matrix addressing]] is used when cell itself has a bistability, so no external capacitor is needed. In some situations passive matrix addressing is used with the help of persistence of vision of the (usually human) eye so the cell need not be bistable. Persistence of vision is used in simpler, slower changing displays such as clocks.

==Raster addressing==