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Presentation, AV, Projectors

Presentation, AV, Projectors Article

takes a video signal and projects the corresponding image on a projection screen using a lens system. All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings. Video projectors are widely used for conference room presentations, classroom training, and home theatre applications.

A video projector may also be built into a cabinet with a rear-projection screen (rear-projection TV, or RPTV) to form a single unified display device, now popular for .home theater. applications.

Common display resolutions for a portable projector include SVGA (800×00 pixels), XGA (1024×68 pixels), 720p (1280×20 pixels), and 1080p (1920×080 pixels).

The cost of a device is not only determined by its resolution, but also by its light output, acoustic noise output, contrast, and other characteristics. While most modern projectors provide sufficient light for a small screen at night or under controlled lighting such as in a basement with no windows, a projector with a higher light output (measured in lumens, abbreviated .lm.) is required for a larger screen or a room with a higher amount of ambient light. A rating of 1000 to 1500 ANSI lumens or lower is suitable for smaller screens with controlled lighting or low ambient light. Between 1500 and 3000 lm is suitable for medium-sized screens with some ambient light or dimmed light. Over 3000 lm is appropriate for very large screens in a large room with no lighting control (for example, a conference room). Projected image size is important; because the total amount of light does not change, as size increases, brightness decreases. Image sizes are typically measured in linear terms, diagonally, obscuring the fact that larger images require much more light (proportional to the image area, not just the length of a side). Increasing the diagonal measure of the image by 25 % reduces the image brightness by 35 per cent; an increase of 41 per cent reduces brightness by half.

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PANASONIC UB-2815C ELECTRONIC WHITEBOARD DAMAGED

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AS-IS Optoma EzPro 732 Multimedia Projector 1400 LUMENS

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50 IBM Color Laser Printer Transparency Film Sheets!

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3M EYB HA6010-R 360 Watts / 82V Projection Lamp -3 Ct-

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Sharp 0A-1650 Computer Projection Panel

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3M Overhead Projecter 9080 (2800 Lumens) w/ WRNTY

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DA-LITE 70x70 HIGH GAIN (2.5) TRIPOD PROJECTOR SCREEN

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60" PLASMA SCREEN TRAVEL/SHIPPING CASE! - NEW!

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PORTABLE MEGAPHONE w/LOUD SIREN w/MICROPHONE ~500 FOOT~

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100 IBM Laser Printer/Copier Transparency Film Sheets!

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15 Watt PA Megaphone Bullhorn Bull Horn Siren

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LOUD MINI MEGAPHONE ~ PORTABLE MEGA PHONE NEW

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NEW 3M Model 1711 Overhead Projector

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NEW CLOSED DOUBLET LENS ENX LAMP CHANGER 2800 LUMEN

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Da Lite 72x96 projector screen, lk new, w/ pull rod

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foray dry erase board 12"x12" clear frameless NEWsealed

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NEC Projector Case ATAPRO200 for LT200 / LT240 / LT260

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250 IBM Color Laser Printer Transparency Film Sheets!

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92 Fixed Projector Screen Silver Frame 16:9 Gray Fabri

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3M Overhead Projector 2000AH Breifcase Portable 220v

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ELMO Visual Presenter EV-400AF Projector

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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 84" 16:9 NR!

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Pocket Size Sound and Music Speaker Megaphone

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Canon RE-350 Video Visualizer Presenter Document Camera

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NEW Marsh Kids Lapboards White Whiteboard Markerboard

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3M 9100 Model 9000AJB Collapsible Overhead Projector

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3M Mixed Model, (10) Overhead Projector, 4000 lumens

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72 Fixed Projector Screen Silver Frame 16:9 Gray Fabri

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HP Premium Inkjet Transparency Film C3834A 67 sheet

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AUCTIONEER'S POWERFUL PORTABLE BATTERY PA WIRELESS MIC

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250 IBM Color Laser Printer Transparency Film Sheets!

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EDNALITE PROJECTION POINTER MODEL 120A

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Smart Tech. SmartBoard PT54-05-835 Smart White Board *

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L120 Infocus Lamp DP5800/DP6800 Proxima Projector NIB!

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NEW 3M 9100 Overhead Projector - 2800 Lumens

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30W Megaphone:Safety Siren:Music:Speaker Mic.- Bullhorn

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Draper Star Manual Projection White Screen 60" Portable

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Elmo HV100XG XGA Visual Presenter

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30W Megaphone:Safety Siren:Music:Speaker Mic.- Bullhorn

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