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Polaview 330 XGA Portable LCD Projector
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 comprise 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 filter and a red, green, or blue color mask.
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.
MHz An abbreviation for megahertz. This is a unit of measurement and refers to a million cycles per
second. Bandwidth is measured in megahertz.
Non-Interlaced A method by which all the video scan lines are presented on the screen in one sweep
instead of two (also see interlace).
Pixel A definable location on a display screen that consists of multiple or single triad of dots (red, green,
and blue). A computer picture is typically composed of a rectangular array of pixels (i.e. 640 x 480). The
resolution of a picture is expressed by the number of pixels in the display. For example, a picture with
560 x 720 pixels is much sharper than a picture with 275 x 400 pixels.
Saturation The intensity of the color is called saturation. Example: A lightly saturated red looks pink.
Fully saturated red is like the red of a crayon. Not to be confused with brightness, saturation is the
amount of pigment in a color, and not the intensity. Low saturation is like adding white to the color.
SVGA (Super Video Graphics Array) Also referred to an extension of the VGA video standard. SVGA
video adapters support resolutions of 800 x 600 pixels and higher with up to 16.7 million colors (known
as true color).
TFT Thin Film Transistor
Vertical Rate (Frequency) The number of times the screen is refreshed per second. Typically shown as a
measure of hertz (Hz).
VGA (Video Graphics Array) Also referred to as Video Graphics Adapter. Introduced by IBM in 1987.
VGA is an analog signal with TTL level separate horizontal and vertical sync. The video outputs to a 15-
inch HD connector, has a horizontal scan frequency of 31.5 kHz, and vertical frequency of 60 to 70 Hz
non-interlaced. The signal has a Pixel-by-Line resolution of 640 x 480 with a color palette of 16 from
256,000.
XGA (Extended Graphics Array) IBM's graphics standard that includes VGA and extended resolutions
up to 1024 x 768 pixels, interlaced, 35 kHz. An XGA video card has a 15-pin HD connector.
XGA-2 (Extended Graphics Array, 2nd Generation) Capable of scanning from 31 to 68 kHz and
resolutions up to 1600 x 1200 pixels. An XGA2 video card has a 15-pin HD connector..
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