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Source: http://en.wikipedia.org/wiki/Video_projectorProjector Overview
A video projector, also known as a Digital Projector, may 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 (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and 1080p (1920×1080 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[1], 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 1500 to 2500 ANSI lumens or lower is suitable for smaller screens with controlled lighting or low ambient light.[1][2] Between 2500 and 4000 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 %; an increase of 41 % reduces brightness by half.
Projection Technologies
- CRT projector using cathode ray tubes. This typically involves a blue, a green, and a red tube. Minimal maintenance is required (unlike projectors that use expensive lamps which must be periodically replaced after they burn out). This is the oldest system and falling out of favor largely because of the bulky cabinet. However, it does provide the largest screen size for a given cost. This also covers three tube home models, which, while bulky, can be moved
- LCD projector using LCD light gates. This is the simplest system, making it one of the most common and affordable for home theaters and business use. Its most common problem is a visible “screen door” or pixelation effect, although recent advances have minimized this.
- DLP projector using Texas Instruments’ DLP technology. This uses one, two, or three microfabricated light valves called digital micromirror devices (DMDs). The single- and double-DMD versions use rotating color wheels in time with the mirror refreshes to modulate color. The most common problem with the single- or two-DMD varieties is a visible “rainbow” which some people perceive when moving their eyes. More recent projectors with higher speed (2x or 4x) and otherwise optimised color wheels have lessened this artifact. Systems with 3 DMDs never have this problem, as they display each primary color simultaneously.
- LCOS projector using Liquid crystal on silicon.
- D-ILA JVC’s Direct-drive Image Light Amplifier based on LCOS technology.
- LED Use an array of Light Emmitting Diodes as the light source, negating the need for lamp replacement.
Model details:
Impress your audience with the E500 projector. Small and feature-rich, the E500 is a cost effective solution for your business and entertainment needs. The E500 features digital light processing (DLP) technology, for superb image quality on the screen. And it is backed with an industry leading 3 Year limited warranty*.
Features & Benefits:
- Small and portable - at a mere 2.4kg (5.4 lbs), it's an excellent solution for use in a shared office environment.
- Get Showing - intuitive keypads, menus (on-screen display) and color-coded connectors helps you get started fast and ready to present on time.
- Resolution - SVGA (800x600) native resolution and supports XGA (1024x768) for versatile usage.
- Shine On - your ideas are brighter than ever at 1600 Lumens.
- Industry Leading Limited Warranty - 3 Year Rapid Replacement Service helps get you up and running quickly if warranty repair is needed.
- Digital Video Quality - experience sharp images and incredible colors with Texas Instruments(R) DLP technology with an outstanding 2000:1 contrast ratio.
- Powerful optical zoom - manually zoom and focus with the optical lens to fill the screen or wall up to 5.15m/16.9ft (diagonal).
- 2000 Hour Lamp Life - long lamp life for dependability. Buying lamps less often helps save money; decreasing your total cost of ownership.
- Auto-sensing - avoid the long awkward pause when connecting to your PC. Calibrated and tested to pick up video signals from IBM ThinkPad notebooks in a flash so you can connect and show.
- Keep it Straight - leveling feet help to keep the image level when placed on an uneven surface and digital keystone correction helps square-up the image when projecting at an upward angle.
- Remote Control with integrated Laser Pointer - pin point your ideas and thoughts during presentations with the laser pointer. Matching keypads on the remote and projector console are similar so you always know what button to push.
- Control slide presentations using arrow keys on remote control.
- Multiple Input Capabilities - includes all cables required to attach to a PC, DVD, VHS, and audio source -- and supports SDTV, EDTV and HDTV formats.
- Audio - audio input jack (3.5mm mini-jack) and a 1 watt integrated speaker.
- Carrying Case - helps protect your projector during stowage or travel.
Around the world, Canon products are synonymous with optical excellence, advanced image processing, and superb performance. Canon projectors are no exception. The family of Canon projectors includes the REALiS line of bright, high resolution, ultra-portable and affordable projectors. REALiS projectors combine the brilliance and sharpness of innovative LCOS (Liquid Crystal On Silicon) technology with Canon's proprietary AISYS light engine technology. The result is a unique set of advanced projectors that deliver exceptional image quality.
The REALiS WUX10 is Canon's top of the line projector, delivering the highest resolution of any Canon projector. The world's first WUXGA (1920 x 1200) projector using LCOS technology, the WUX10 provides spectacular image quality, resolution, and color reproduction. This exceptional projector also features Canon's exclusive AISYS technology - with improved light efficiency, uniformity, and expanded color space for outstanding color reproduction, delivering razor sharp image quality.
This wide screen projector boasts a multitude of features that make it a versatile and easy-to-use performer, including an HDMI terminal that lets you project 1080p content from satellite and digital cable boxes, as well as DVD players. A built-in network port allows for remote network operation and its 1.5x powered zoom lens with autofocus features a 10:0 lens offset. The bottom edges of the projected images have been made to match the optical axis of the lens.
Designed to meet the needs of users in corporate, educational, and specialized fields, the REALiS WUX10 contains all the technology needed for superior performance, as well as fast, easy, and quiet operation.
