DLP Projectors

DLP Projectors
By Elizabeth Morgan

Some of the indispensable parts of a projector are the feed spool, xenon arc lamp, projection lens, optical sound head, take up spool, an aperture, normal lens and a rotating shutter. But with the advancement of science, new technologies have come into play. The projectors have become much more advanced in terms of clarity of picture and the quality of the pixels. Also, the projectors have found use in everyday households, as new versions of domestic projectors have arrived on the market. The abundance of LCD projectors, DLP projectors and video projectors has allowed the common man to enjoy the experience of a big theater hall in his living room.

DLP, or Digital Light Processing, is a technology implemented in todays projectors and projection televisions. In DLP projectors, the image is created by microscopically small mirrors. These minute pieces are then put in a matrix on a semiconductor chip. This chip is called DMD (Digital Micromirror Device). These mirrors are treated as pixels. The number of those minutely small mirrors exactly corresponds with the resolution of the project image.

There are single-chip projectors and three-chip projectors. A single-chip projector has a single DMD, and a single color wheel produces all the colors. The color wheel is divided into four sectors of basic primary colors. They are red, green, and blue, and an additional clear section to boost brightness. A three-chip DLP projector uses a prism to split light from the lamp. Then the basic colors are routed to their own DMD chip. Then these colors are passed through the lens, where they are combined together.

Projectors provides detailed information on Projectors, LCD Projectors, DLP Projectors, Video Projectors and more. Projectors is affiliated with DVD Projector Rentals.

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Overhead Projector Rentals

Overhead Projector Rentals
By Marcus Peterson

Overhead projectors are used to project transparencies. One contains a glass plate with a light source from below that reflects the image in the transparency through a lens on an arm to a screen. Transparencies are polyester films of a standard A4 paper size that allows light to pass through.

Overhead projectors are simple to use and they were the first ones to be used for business and classroom presentations. This was before the arrival of data and video projectors. The projector can be set up in 10 seconds, the arm can be bent for easy portability and weighs approximately 14 lbs. The resolution can be in the range of 4000 lumens. The OHP comes with accessories such as a portable stand so that projector can be placed in the middle of the classroom, a collapsible screen, extension cords with different lengths, and sockets.

The rental rates usually vary from $30 to $50 daily, $100 for a week and $200 for a month. Most of the university classrooms have OHPs installed. The advances in data projection for CD, DVD and laptops have reduced the demand for OHP.

Use of overhead projectors has declined with the flashy presentations of PowerPoint. Still they are occasionally used in universities, in classrooms for lectures, and job training. They are preferred over data projectors as they are simple and dont require computers for input. The transparencies can be modified during the lecture itself, which makes it versatile. The disadvantage is that OHP is fragile and bulky. Also, care should be taken to ensure that the transparencies are clear. For instance, photocopied text book pages will look bad on the screen.

Some of the important branded overhead projectors are 3M, Bell & Howell, Dukane, and High Lumens. Specific features such as built-in lamps and image magnifiers add to the higher rental rates.

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