Electronic Visual Display - Addressing Modes

Addressing Modes

Each sub-pixel of a display devices must be selected (addressed) in order to be energized in a controlled way.

Addressing modes (selection of picture elements)
direct addressing
each individual picture element has electrical connections to the driving electronics.		 multiplexed addressing
several picture elements have common electrical connections to the driving electronics,
e. g.. row and column electrodes when the picture elements are arranged in a two dimensional matrix.
active matrix addressing
active electronic elements added in order to improve selection of picture elements.
  • thin-film diodes (TFDs)
  • thin-film transistors (TFTs)
    • amorphous silicon (a-Si)
    • polycrystalline silicon (p-Si)
    • monocrystalline silicon
 passive matrix addressing
the nonlinearity of the display effect (e.g. LCD, LED)is used to realize the addressing of individual pixels in multiplex addressing. In this mode only a quite limited number of lines can be addressed. In the case of (STN-)LCDs this maximum is at ~240, but at the expense of a considerable reduction of contrast.
The matrix of active electronic elements can used in transmissive mode of operation (high transmittance required) or a non-transparent active matrix can be used for reflective LCDs (e.g. liquid crystal on silicon (LCOS)).|

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