|
|
Gas Plasma flat panels use an array of cells, known as pixels, which are
composed of 3 sub-pixels, corresponding to the colors red, green and blue. Gas in a plasma state is
used to react with phosphors in each sub-pixel to produce colored light (red, green or blue). These
phosphors are the same types used in conventional cathode ray tube (CRT) devices such as televisions
and standard computer monitors.
|
 |
|
|
A term used to describe the appearance of a dual image or losing the cursor that is being projected
onto the screen. This is most prevalent in passive matrix panels/projectors.
|
|
|
|
A term used to describe an image containing a number of gray shades as well as black and white.
|
|
|
|
|
Produces bright, slightly yellow looking light.
|
|
|
|
A unit of frequency equal to one cycle per second. Vertical Scan rate is measured in Hertz. 60
Hertz = 60 cycles per second.
|
|
|
|
|
High Definition Television. The most detailed type of television signal available.
Offers a high-quality picture as a result of more than the usual number of lines per frame.
|
|
|
|
|
Invisible rays just beyond the red end of the visible spectrum. Their waves are longer than the
spectrum colors but shorter than radio waves. Infrared waves only work for short distances
(under 40 ft) and line of sight. Often used in remote controls.
|
|
|
|
A video mode that draws the even lines on the screen in one pass, the odd lines on the next.
Fading of lines between each pass can be noticed causing the screen to flicker.
|
|
|
|
|
Distortion (either wide-top / narrow-bottom or vice versa) of a projected image because the
projector is not at a 90 degree angle to the screen. Keystoning can be fixed by tilting
the screen or adjusting the projector so that they are at a degree angle to each other.
Optical keystone correction compensates for the OHP/projector not being at a 90 degree
angle by tilting the LCD glass or raising/lowering the angle of projection. Digital keystone
correction compensates for the trapezoidal image by digitally reconstructing the image at
various settings so that the image is square.
|
|
|
|
|
The period of time that the lamp inside your projection system could provide enough light
to display an image if it were left on continuously.
|
|
|
|
Liquid Crystal Display. One of the two standard display types found in computer projectors.
LCD operates as a light valve, allowing light to either pass through or to be blocked by using a
combination of electronics, optics, and chemicals, which, in turn, produce the projected picture.
|
|
|
|
Local Area Network. A local computer network to allow communication between computers or
projectors. Usually limited to operating within departments or buildings.
|
|
|
|
|
System of measurement for determining brightness of a projected picture, typically rated by the
ANSI (American National Standards Institute). ANSI lumens are measured in "candle power",
the amount of energy radiated by a single, specifically sized candle made of a specific material
and shaped in a specific way. A lumen is the energy of one candle on each square foot of a sphere's
surface at a radius of one foot from the light's source.
|
|
|
|
|
A raw measurement of light output measured by a light meter. Lux is used to compute lumens.
|
19462 Powder Hill Place Suite 101
Poulsbo, WA 98370