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Elite Screens' Blog Team
2017/02/28,

Elite Screens' Blog Team

Terminology

Definition

Keystone Correction A projector's ability to correct the distortion caused when a projector is vertically off-axis from the screen.  Instead of seeing an image that is wider or narrower at the top of the image than at the bottom, Keystone eliminator corrects the artifact by restoring the image to a proportionate rectangle where the bottom width is equal to that of the top.
Keystone Eliminator A feature typically found on portable projector screens that allows the surface to be physically tilted to correct keystoning.
Keystoning A projector artifact caused when a projector is vertically off-axis from the screen.  Instead of seeing a proportionate rectangle-shaped image, the top or the screen is either wider r narrower than the bottom.
LCD Acronym for Liquid Crystal Display. It is used in high-resolution projected imagery and is the alternate to DLP technology.
Lenticular A front or rear projection screen that utilizes a textured optical surface that adequately diffuses on or off axis light signals.
Long Throw Lens Specialty lens designed to allow a projector to throw a smaller sized image from a greater distance.  An example would be in commercial theaters.
Low Gain The measured screen brightness or "gain" is less than 1.0.  Also referred to as "negative gain".
Lumens Measurement of SI derived unit of measurement for luminous flux.  It is used to measure the brightness of a projector's output.