dB—
Diagonal Screen— A method of measuring the size of a screen or a projected image. It measures from one corner to the opposite corner. A 9FT high, 12FT wide, screen has a diagonal of 15FT. This document assumes that the diagonal dimensions are for the traditional 4:3 ratio of a computer image as per the example above.
DLP®— Digital Light
DMD— digital Micro- Mirror Device— Each DMD consists of thousands of tilting, microscopic aluminum alloy mirrors mounted on a hidden yoke.
Focal Length— The distance from the surface of a lens to its focal point.
Frequency— It is the rate of repetition in cycles per seconds of electrical signals. Measured in Hz.
HDMI— High Definition Multimedia Interface, carry both uncompressed high definition video along with digital audio and device control data in a single connector.
Hz — Hertz, unit of frequency.
Keystone Correction— Device that will correct an image of the distortion (usually a
Laser pointer— A small pen or cigar sized pointer that contains small battery powered laser, which can project small, red (typically), highly intensity beam of light that is immediately very visible on the screen
Maximum Distance— The distance from a screen the projector can be to cast an image that is useable (bright enough) in a fully darkened room.
Maximum Image Size— The largest image a projector can throw in a darkened room. This is usually limited by focal range of the optics.
Minimum Distance— The closest position that a projector can focus an image onto a screen.
NTSC— National Television Standards Committee. North American standard for video and broadcasting, with a video format of 525 lines at 30 frames per second.
PAL— Phase Alternating Line. A European broadcast standard for video and broadcasting, with a video format of 625 lines at 25 frames per second.
44