Home > Addressing scheme

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 volts per gray shade, where ΔV is the potential range that the pixel respons to. Each separation is typically some mV . Since there is risk for a 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

There is three kinds of electronically addressing schemes for Liquid Crystal Displays (LCD). Direct addressed display include a conductor to each pixel, and thus, for a n × m-display, (n × m) pads are needed. Active and Passive matrix addressing wire the conductors in a matrix. The former needs to connect one Thin Film Transistors (TFT) to each pixel, and the latter relies on the pixel's bistabiltyFor electronics, see flip-flop, or the bistable multivibrator''. Something that is bistable can be resting in two states. In physics, for an ensemble or particles, the bistability comes from the fact that its free energy has three critical points. Two of such as ferroelectrism. For a n × m-matrix schemes, only (n + m) pads are needed.