InFocus Overhead Projector Manual

Video projector - Wikipedia, the free encyclopedia

August 29, 2013 – 10:10

InFocus IN3114 Projector | InFocus

A video projector or video projector is a device that receives a signal from video and projects the corresponding image on a screen using a projection lens system, allowing display still or moving images.

All video projectors use a very bright light to project the image, and the latest can be corrected curves, smudges and other inconsistencies through manual settings. Video projectors are mainly used in presentations or lectures halls, classroom teachers, but you can also find applications for home theater . The input video signal can come from different sources such as a TV tuner (terrestrial or satellite), a personal computer ...

Another term like is overhead video projector which, unlike the first, is implemented internally in the television set and projects the image to the viewer.

Currently there are several types of screening technologies in the marketplace. The most important and a brief summary are:

[ editar · editar fuente ] Projector CRT [ edit · edit font ]

The projector cathode-ray tube typically has three high performance vacuum tubes, one red, one green and one blue, and the final image is obtained by the superposition of the three images (additive synthesis) in analog mode.

  • Advantages: This is the oldest, but it is the most widespread in television .
  • Disadvantages: being the oldest, is almost extinct in favor of the other systems described here. CRT projectors are suitable only for permanent installations, and they are very heavy and large, and have the drawback of mechanical and electronic complexity of overlapping colors

[ editar · editar fuente ] Projector LCD [ edit · edit font ]

The system LCD is the most simple, therefore one of the most common and affordable for home use. In this technology, the light is divided into three and passed through three liquid crystal panels, one for each primary color (red, green and blue), and finally the image is recomposed into a constituted by pixels, and are projected onto the screen using a lens.

  • Advantages: is more efficient than DLP systems (brighter images) and produces highly saturated colors.
  • Disadvantages: is visible pixelation effect (although the most recent advances in this technology have minimized), is likely to occur and dead pixels lamp life is about 2000 hours.

É == == 3D Projector

Art projector that displays images on a special treated so that the projected images that surround the viewer giving the feeling of surround image.

The market for video projection is booming, because in the last five years has been multiplied by four the number of video projectors sold and in sales last year up to a total of € 16, 000 million.

Major manufacturers are:

This article needs references that appear in a reputable publication such as journals, monographs, newspapers or websites reliable .
You can add and or notify the author of the article on their talk page pasting: {{subst:Aviso referencias|Proyector de vídeo}} ~~~~


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There are two kinds of "overhead projectors"

Opaque and transparency.
The opaque is probably what you are thinking of. The ones schools use are quite large boxes (I used one at Theatre/Theater and Bindlestiff Studios to create billboards for productions)
There are smaller ones like the Artograph I got from Pearl that only handle 7x7 inch images.
I haven't been able to find the old-fashioned box-monsters online. All I can find are the modern compacts like the Buhl Mark IV Opus. A thousand dollars! Argh!
Try eBay and Google looking for Opaque Overhead Projector. Your local library may even rent them.
Hope this helps.

Can you hear me now?  — Computerworld
It's more than usually confusing because he's using the overhead projector while sitting at right angles to the screen, because that's how the PC, keyboard and monitor are placed, so he really doesn't need any extra distractions.

Lubbock artist sculpts roadrunner for UTSA  — MYfoxLUBBOCK.COM
He started by taking a picture of a road runner in his front yard. "I took a picture of a road runner. Had it blown up to twelve inches tall and two foot long. And put it on an overhead projector and threw it on the wall.

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  • Avatar Mommy of 2) Where can I find a projector for rent for my project? Not a movie projector.?
    Jul 17, 2008 by Mommy of 2) | Posted in Painting

    Like the ones they use in school that you put an image on and it shows it on the wall. NOT A MOVIE PROJECTOR. You think a library might have one??
    I want to paint a mural on my sons wall. I have found murals you can buy online and the one I like is 700 dollers. I printed in on a transparancy and tried to use a a lamp but that doesn't work..

    • You might be able to rent one from a business center. I have rented them for hotel conferences many years ago.
      Another option is to enlarge the image you have using the grid system. Draw grid lines in the original …transfer the image, drawing the shapes in each square. For example a 1/2 inch square on the orignal, would be a 6 inch square on the wall. That's the way a professional muralist would do it. That's the way I would do it.

  • Avatar gason2 Recommend a HD tuner for my Projector?
    Sep 01, 2009 by gason2 | Posted in Home Theater

    I am looking into getting one of these three 720P DLP Projectors and I will need to upgrade my tuner to handle HD. First off, which of these two projectors would you go with? Would you recommend another? I'm not ready … projection tv to an overhead projector? Thanks.
    The reason I'd rather not get 1080P; more $, I'd have to buy a pricey blueray player plus blueray discs and I'd also have to upgrade my dish to HD which is too much

    • I have the Samsung DTB-H260F, works great using HDMI output to my projector:
      not get the 1080p Optoma HD20? In stock at Amazon, free shipping:
      have a 720p projector, which works well, but I will be upgrading to a 1080p soon. Twice the pixels makes a huge difference, especially if you have a big screen.