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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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COUNTRYMAN E6 ISOMAX WIRELESS MIC -USED
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3M 9200IW Plus 60" Digital Wall Display 78-9236-6900-2
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PORTABLE 25 WATT PUBLIC ADDRESS + 3 VHF WIRELESS MICS
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DA-LITE 84x84 HIGH GAIN (2.5) TRIPOD PROJECTOR SCREEN
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New Box of Highland 901 Clear Transparency Films - 100
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3M 9200 Overhead Projector Used good
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COMBO 50 & 15 WATT LAW ENFORCEMENT BULLHORN MEGAPHONE
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MEGAPHONE 30 WATT W/ MICROPHONE ~ SPORTING BULL HORN
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3M Portable Briefcase Overhead Projector 2000 AG SWEET!
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PANASONIC PANABOARD MODEL KX-B520
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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC
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Horizon 16000 Overhead Projector Used with bulb
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4' x 6' Conference Whiteboard w/Stained Oak Surround
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Nucraft Lectern Tech Cart A/V Conference Podium
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LOOK! 3M OVERHEAD PROJECTOR MODEL 9100 @
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2 NEW COMPACT POCKET MINI MEGAPHONE CHEER SPORTS SIREN
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NEW DA-LITE 72x96 WALL MOUNT 1.0 GAIN PROJECTOR SCREENS
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NEW PORTABLE 10 WATT HANDHELD MINI MEGAPHONE LOUD SIREN
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MEGAPHONE 30 WATT W/ MICROPHONE ~ SPORTING BULL HORN
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EXPO COMBO MAGNETIC DRY ERASE MEMO BOARD 23" x 36" NEW
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Aluminum White Board Easel Tripod USA FREE SHIP GR08-81
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3M AF 4310 WRITE-ON TRANSPARENCY ROLLER FILM
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NEW Extron Hideaway HSA 402 AV Computer Video Interface
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Bogen LoudSpeaker BullHorn SPT-5A "NEW"
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Dukane Filmstrip Projector Model 28A33A
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New 3M OVERHEAD PROJECTOR MODEL 9050 Includes Lamp Bulb
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Expo Dry Erase Markers Chisel Tip Low Odor Asst Qty 4
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Expo Dry Erase Markers Chisel Tip Low Odor Asst Qty 8
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TARGUS POWERPOINT PRESENTER W/ LASER & VOICE RECORDER
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NEW 30 WATT MEGAPHONE BULLHORN HORN SPEAKER SIREN MUSIC
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Apollo Ai 5000 Ai5000 Opaque Projector
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MAGNETIC DRY-ERASE BOARD WITH FOOTBALL TEXTURES NEW
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3M TRANSPARENCY FILM FOR COPIERS 90+ SHEETS PP2500
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MEGAPHONE 30 WATT W/ MICROPHONE ~ SPORTING BULL HORN
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10W Megaphone / Bullhorn Music & Speaker Mic. -BULLHORN
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