Video Projector

This is one device we’re all too familiar with. In fact, we saw it all the time while growing up and it almost fails to register as a ‘device’. Rather, we look at it in pretty much the same was we would look at a light bulb – it’s almost that common. However, the video projector is getting quite sophisticated, from the overhead projector (OHP) of yesteryear to the latest LCD projectors. Nevertheless, projectors are to date used for exactly the same purpose they were used for when they were made initially – visual representation on a larger scale, for a larger audience.

Video projectors are largely used in presentations, seminars, lectures to display data on a screen for the benefit of everyone. All video projectors use a strong and bright source to make this possible. In the OHP, this process was mechanical. Transparent sheets of data were placed on a glass surface under which was a bright light source. This transparency was reflected by means of a lens and then the data appeared on a screen. One could adjust the lens to make the data clear, blurred or change the position it was displayed. However, these were not video projectors – since it was only possible to displayed text and images. Video projectors today can be connected to PCs in order to display movies, videos, and other high-res graphics. These video projectors although technologically much more advanced, use the same principles – a lens and a light source. Video projectors are used largely for presentations, screening movies in a home theatre system, screening live events and often in classrooms to make teaching more interesting.

There are different types of video projectors available today to cater to the requirements of people. If you intend to buy a video projector, you will have to consider your needs first and according evaluate the projectors on parameters like light output, resolution and screen size. Accordingly different types of projectors will work for you. For portable projectors – the kind that consumers generally buy, four types of screen resolutions are available SVGA (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and 1080p (1920×1080 pixels). A larger resolution will give you better output on a large screen. Therefore, depending on your screen size you will have to opt for a suitable video projector.

Another issue you will have to take note of is light output. Light output will determine if how well a projector can work in the presence of ambient light. A video projector can function best in the absence of light, since the projector has a light source of its own. The higher the light output, the better will be its function even in a room that has some ambient light. Light output is measured in lumens. If you intend to use the video projector on a large screen in a room with some light, you require something above 4000 lumens. These projectors are used mostly for conference rooms that have no lighting control. For home use one can make use of a video projector with 1500-2000 lumens.

Video projectors are also classified depending on the technologies they use. The most common were the cathode ray projectors which used cathode ray tubes, much like your CRT monitors. A CRT projector produces great resolution but has low light output. They required minimal maintenance however were quite bulky and large. Also, later, more compact and sleek looking LCD projectors came into the market and the CRT ones became less popular. The LCD projectors are pretty simple and most importantly, rather small in size and are preferred for use in homes and businesses. They provide a bright light, good resolution for images and consume little power. Most importantly they are rather inexpensive when compared to the CRT projectors.

This Video Projector Review is Written/Updated on Jun 6th, 2009 and filed under Computer Hardware. Both comments and pings are currently closed.

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