PALC

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Plasma Addressed Liquid Crystal (abbreviation PALC ) is a technology for flat screens that contains or combines elements of plasma screens , LCDs ( Liquid Crystal Displays ) and TFT displays .

In PALC displays, the lateral transistor required to control the pixels in the TFT display has been replaced by a plasma switch, with the help of which an electrostatic charge is deposited in a thin glass pane, which in turn aligns the liquid crystals of the individual pixels of an LCD.

The plasma switch has the dimensions of a line and switches all liquid crystal cells (pixels) line by line to the control voltage supplied to them through transparent vertical cover electrodes. This multiplex process is also used in the other flat screen technologies, but the production of PALC has lower demands on purity and precision than LCD. Pixel defects that cause production rejects of 50% in TFT displays do not occur.

PALC does not have the problems of aging and burn-in of plasma displays, as no phosphors are used - the display, like that of the LCD, is based on pixel-by-pixel color filtering and attenuation of a light source ( backlight ) behind it by means of liquid crystals and color and polarization filters . PALC therefore have similarly low power consumption values ​​as LCD or TFT.

Further measures (ASM, axially aligned micro-cell mode ) make it possible to increase the viewing angle, which is limited in LCD and TFT displays, to 140 °.

Sharp and Sony have been involved in PALC technology since 1995. Philips has since withdrawn and relies on ZEUS display technology , a vacuum display that works with electrons and phosphors. PALC uses licenses from Tektronix .