What is dlp projection

LCD Projector. Type of video projector for displaying video, images or computer data on a screen or other flat surface; modern equivalent of the slide or overhead projector.

Colors then pass via 3 separate prisms, with colors converged via 2nd prism for projection on screen. What to Look for when Choosing a Projector The ideal choice for your projector depends upon several factors: whether you want it for a home theater or office presentations; whether it has a dedicated spot or will be used when traveling often; and, of course, budget. DLPs using LED or pico technology are even more portable and can connect to smart phones, tablets and other mobile devices.

Reduced Pixelation: DLP projectors have a muted pixel structure when viewed from a normal viewing distance, which may not affect a PowerPoint presentation, but will affect smooth video presentations. Reliability: DLPs have fewer parts and are less expensive to repair - sealed optics are good for dusty environments. LCD projectors do not have a color wheel. Light leakage: Grey band outside of the image can cause stray light reflecting off the edges of the mirrors on DLP chip.

This can be avoided by installing black borders around the older DLP projector screen. Disadvantages of LCD projectors LCD disadvantages are more relevant to video: Screen door effect : Sharper images can be disadvantage, since precise focusing makes pixilation more obvious.

Contrast: LCD contrast cannot produce completely black images with older models. Image degradation: More parts can cause image degradation if color balance shifts and contrast reduced. Dead pixels: One or more pixels turn permanently on or off. Clusters of affected pixels interfere with the image quality and the experience. Follow Share Cite Authors. Related Comparisons. Contribute to Diffen Edit or create new comparisons in your area of expertise.

Some people aren't bothered by it, but others notice it. This is not enough to offset DLP's worse contrast ratio performance, though. Check out "What is refresh rate? Single-chip DLP projectors, however, create an image using "sequential" color.

As in, at any given fraction of a second, there's just one color on the screen. This is done fast enough that your brain combines it into a full-color image Some people are susceptible to "rainbows," where their brain registers the sequential color.

It looks like a rainbow smear, and it's especially noticeable if you move your eyes rapidly around the screen, or bright moving objects on a dark background like streetlights. In all the years I've been reviewing DLP products, I've found that everyone falls into one of three categories:. Most people fall in the latter two categories, but if you're in the first, DLP isn't right for you.

With faster and faster color wheels, and the move toward LED and laser light sources, rainbows are much less apparent than they used to be. Another option is three-chip DLP projectors, but these are much more expensive than the single-chip varieties, and still don't have the contrast ratios of LCoS models.

The chips that create an image in a projector are very small, and even tiny variations in the positions each chip can be visible on screen. These can look like colored edges to white objects or, worst case, a softness.

Most three-chip projectors come with convergence adjustments of varying amounts , but these can't always totally eliminate convergence errors. Worse, it's hard to tell from reviews if a projector has good or bad convergence, as it can vary on a per-unit level.

That is, the one I review could be perfect, but yours got tossed off the back of a truck and is terrible. Single-chip DLP projectors, of course, don't have convergence problems because there's nothing to converge.

Bottom line As I said at the top of this piece, there are good and bad projectors based on each technology. However, each technology has strengths and weaknesses, so knowing these going in can help you find the perfect projector. Oh, and don't forget the screen. Check out "The big picture: Projection screen basics. Got a question for Geoff? Still have a question? This is usually a range, thanks to the optical zoom — you can find it in the user manual or specifications page online if it's for a projector you plan to buy.

You can calculate the projection image size by dividing the distance between wall and the projector by the throw ratio of the projector. So if your projector is placed 10 feet away from the screen and has a throw ratio of 1. Ideally, you should be sitting at a distance that is more than twice the width of the image.

To make things simpler, many manufacturers offer a distance calculator on their website for various models. Here, you just input a distance or required screen size. Tip : Some aberrations can be corrected in-projector keystone for example but proper placement is the most preferable. Projecting on Walls vs Screens. Subscribe to ETPrime. Browse Companies:. Find this comment offensive? This will alert our moderators to take action Name Reason for reporting: Foul language Slanderous Inciting hatred against a certain community Others.

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