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Office Products

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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Bell & Howell Portable Overhead Projector 388 B

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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 106" 16:9 NR!

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14551-CANON RE-650 VIDEO VISUALIZER

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100 16:9 High Gain High Contrast Projector Screen White

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GREAT 3M 1830 OVERHEAD PROJECTOR w/ LAMP 2700 Lumens

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85 Fixed Frame Projector Screen 2.35:1 Gray Fabric

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AS-IS Optoma EzPro 732 Multimedia Projector 1400 LUMENS

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Wireless Presentation Remote Powerpoint Laser Pointer

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40 inch Ultra Portable Table Top Projector Screen 4:3

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AS-IS NEC LT180 XGA DDR DMD DLP Multimedia Projector

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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 100" 16:9 NR!

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DRY ERASE WHITEBOARD ERASER AND FINE POINT BLK MARKER

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80" 4:3 High-Gain Electric Projector Screen Black Case

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NEW ELECTRIC MOTORIZED PROJECTOR SCREEN 84" 4:3 NR!

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ELMO EV-4400AF VIDEO PRESENTATION DOCUMENT CAMERA

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MAGNETIC DRY-ERASE BOARD WITH GOLFBALL TEXTURES NEW

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CANON RE-350 VIDEO VISUALIZER/PRESENTER DOCUMENT CAMERA

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NEW Portable Waistband PA Voice Amplifier + Microphone

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3M 1730 School Overhead Projector * * NEW BULB * *

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New TUFFBOX Road Case for 50" PLASMA TV - w/Wheels!

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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC

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90" 4:3 High Gain High Contrast Projector Screen Black

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APOLLO PROJECTOR AUDIO VISTA WORKING W/ BULB

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10W Megaphone / Bullhorn Music & Speaker Mic. -BULLHORN

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Plus BF-030S Electronic Whiteboard

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DA-LITE 30x40 PRESENTER 50" COMPACT PORTABLE SCREEN

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3M 9100 Overhead Projector

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96 Fixed Frame Projector Screen 2.35:1 Gray Fabric

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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC

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QUARTET 3 LEG WET ERASE EASEL

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40 inch Ultra Portable Table Top Projector Screen 4:3

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CLASSROOM TEACHER AUCTIONEER LECTERN PODIUM LECTURN

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NAME BADGE LABELS 3.375" X 2.33" LABEL :313806

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Transparency Film for Inkjet 60 sheets NEW

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

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100 Fixed Frame Projector Screen 4:3 White Fabric

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ELMO EV-400AF VISUAL PRESENTER

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80 Fixed Projector Screen Silver Frame 16:9 White Fabri

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3M 1711 OVERHEAD PROJECTOR w/ WORKING LAMP ~2500 Lumens

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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC

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Plus BF-035 Electronic Whiteboard

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Transparency Film for Inkjet 50 sheets NEW

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3M TRANSPARENCY FILM for Copiers #PP2500 - 100 Sheets

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VERY NICE QUILL OHP 410 OVERHEAD PROJECTOR

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Wiko A/V Photo Bulb EVW 82V 250W Lot (2) NIB!

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DA-LIGHT PROJECTION SCREEN FIXED WALL FRAMED 72" x 96"

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HISONIC 35 WATT PA SYSTEM w/ 3 VHF WIRELESS MICROPHONES

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95 Fixed Frame Projector Screen 2.35:1 White Fabric

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