| 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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133 Fixed Frame Projector Screen 2.35:1 Gray Fabric
$379.99 |
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Apollo Overhead projector used
$3.00 |
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BLUE BEAST HI-OUTPUT AAA BATTERY RED BEAM LASER POINTER
$6.99 |
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CASIO GRAPHIC OVERHEAD PROJECTOR CALCULTOR OH-7000G
$24.00 |
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3M 1730 School Overhead Projector * * NEW BULB * *
$19.95 |
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BenQ W500 Projector, Excellent Condition, NR
$61.01 |
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138 White FIXED FRAME PROJECTOR SCREEN 16:9 WIDESCREEN
$463.98 |
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Elmo EV-368 Overhead Projector Visual Presenter
$69.99 |
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123 Fixed Frame Projector Screen 2.35:1 Gray Fabric
$309.99 |
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3M 9700 OVERHEAD PROJECTOR PORTABLE
$25.95 |
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Toshiba TDP-TW100U Conference Room Projector
$1279.95 |
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Epson PowerLite 77c MultiMedia Projector
$799.95 |
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Epson PowerLite S5 MultiMedia Projector
$599.95 |
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Da-Lite Flip Chart\Porcelain Easel
$145.00 |
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133" 16:9 Heavy Duty Electric Projector Screen / Remote
$479.98 |
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OVERHEAD PROJECTOR TRANSPARENCY FILM, TRANSPARANCIES
$7.99 |
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37" PLASMA SCREEN TRAVEL/SHIPPING CASE! - NEW!
$149.00 |
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150" 4:3 Heavy Duty Electric Projector Screen / Remote
$659.98 |
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BLUE BEAST HI-OUTPUT AAA BATTERY RED BEAM LASER POINTER
$6.99 |
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C619C- 3M 9100 Overhead Projector
$0.99 |
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3M FIVE "O" EIGHTY EIGHT PORTABLE OVERHEAD PROJECTOR NR
$39.99 |
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Optoma EP1691 MultiMedia Projector
$1079.95 |
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New Da-Lite 96x96 Screen-NEW READY TO SHIP TODAY FACTRY
$128.99 |
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Panasonic ET-LAD40W Replacement Lamp
$679.95 |
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4 x 8 Melamine Dry Erase Marker Board w/Oak Frame
$170.00 |
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ELMO EV-500AF Visual Visualizer Presenter Projector NR
$76.00 |
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Toshiba TDP-TW355U Conference Room Projector
$2099.95 |
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NEW 3M 2000 AG Portable Suitcase Overhead Projector NIB
$99.00 |
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APOLLO Horizion 2 Overhead Projector / Presentation
$9.99 |
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Optoma EP7155 MultiMedia Projector
$1019.95 |
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Epson PowerLite 1810p MultiMedia Projector
$1799.95 |
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ELMO HP-L355 OVERHEAD PROJECTOR
$0.99 |
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Epson MovieMate 72 MultiMedia Projector
$1229.95 |
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3M 2000 AG Portable Suitcase Overhead Projector DAMAGED
$0.01 |
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Toshiba TDP-PX10U Mobile Projector
$1024.95 |
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3M 9000AJB 9100 Overhead Projector
$39.95 |
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Da-Lite Flip Chart\Porcelain Easel
$145.00 |
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NEW – 3M Color Laser Transparency Film CG3700 50/Pack
$24.99 |
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Toshiba TDP-EW25U Conference Room Projector
$1689.95 |
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Toshiba Service Replacement Lamp
$399.95 |
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New Da-Lite 96x96 Screen-NEW READY TO SHIP TODAY FACTRY
$128.99 |
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130" 4:3 High Gain High Contrast Projector Screen Black
$279.99 |
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LOT OF 2 3M 9100 Overhead Projector M No. 9000AJB
$39.95 |
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SHARP LCD PROJECTOR XG-E650V #9154
$19.95 |
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Toshiba Projector Lamp
$274.95 |
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130" 4:3 Electric Motorized Screen Dual Remote White
$299.98 |
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MAGNETIC DRY-ERASE BOARD WITH BASKETBALL TEXTURES NEW
$5.00 |
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