LCD (Liquid Crystal Display)
Display technology that relies on
polarizing filters and liquid-crystal cells rather than phosphors
illuminated by electron beams to produce an on-screen image. To
control the intensity of the red, green, and blue dots that com-
prise pixels, an LCD’s control circuitry applies varying charges to
the liquid-crystal cells through which polarized light passes on
its way to the screen. The amount of light that makes it through
to the screen depends on the amount of charge applied to the
corresponding cell before passes through a second polarizing fil-
ter and a red, green, or blue color mask. It was first developed in
1968 by RCA laboratories.
Lumen
A unit of measure for the amount of light emitted by a
light source.
Luminance
This is the signal that represents brightness in a
video picture. Luminance is any value between black and white.
Luminance is abbreviated as “Y”.
Lux
The amount of light per square meter, incident on a surface.
Polaview 220 DLP Projector
continued
