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DLP Home Video Projectors

Digital light processing (DLP) uses micro-electro-mechanical technology, which relies on a digital micromirror device. The latter hash has thousands of microscopic mirrors arranged in a rectangular array and corresponds to the pixels in the image. These projectors are typically used for home entertainment, such as for watching films, programs or displaying pictures. Many businesses and offices use them for productivity purposes as well. Reputable electronics brands such as LG, BenQ and Optoma produce a variety of DLP projectors.

How does a DLP projector display images?

The image is created by microscopic mirrors on a semiconductor chip called the digital micromirror device (DMD). Each mirror corresponds to one pixel, so the number of mirrors represents the resolution of a projected image. These mirrors may be repositioned rapidly and reflect light through the lens or onto a heat sink. This produces a greyscale image. Single-chip DLP systems add a colour wheel to convert the monochrome picture into colour. They do this by flashing red, blue and green light sequentially into the chip, and when the small mirrors are synchronised with the flashing of these lights, over a billion colours can be created. It is then simply a matter of projecting the image through magnification.

How do I set the keystone correctly?

Keystone Correction is a common feature found in many DLP video projectors. This feature is needed when it is impossible to get the correct lens-to-screen angle, such as when space is limited. Initially, your image may look wider on one side and narrower on another due to how the projector is not perpendicular to the screen. Keystone correction is a software tool that manipulates the projected image vertically, horizontally or both in order to make it as close to a rectangular image as possible. You can access this function in your projector's on-screen menu or on the remote control of the unit.

How do I use the lens shift function effectively?

Lens shift physically moves the lens assembly of the projector at vertical, horizontal or diagonal axes without moving the entire projector. The number of options depends on the projector model. This function is also accessible from the remote control. This raises, lowers or repositions the image without changing the orientation of the entire projector. Lens shift allows for small changes when the image spills over to a side or top or bottom of the screen to fit the entire image within the screen borders.

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