LCD Projectors

The days of the film projector are numbered. With the advent of LCD screens, HDTV, and MP3 players, the movie experience is experiencing a revolution almost akin to the digital revolution in music.

The cheap cost of movie projector screens (now about $500) and lower barrier to entry to the consumer level theater have effectively structured a second Co2-box between film and home entertainment.  The old school projector would have been the first choice if this were to be a top priority, but the new LCD screens provide crystal clear pictures and the added advantage of a fairly high contrast ratio for a better picture.  Savings vary depending on the projector, but getting a screen large enough to watch a film in its native format (which these days is between 16mm and 70mm in diameter) on a standard TV between 1975 and present has aesthetic and practical reasons.

There are still a couple of practical issues to consider, however.  The first being that a screen of a certain size is set to become outdated soon, and replacements of old screens are not exactly being made on a large scale.  Here we are looking at the predicament of the projectionist.  By adding a second screen (or indeed adding more than one), the projectionist can cut down on materials and labor involved in the first projection.  He could do this by moving to a larger projector, or by switching to a newer model.

There are of course challenges still, and the projector tech is still figuring out how to deliver good performance on a widescreen.  A solution is being developed, a so-called active matrix display, that could deliver up to 100-degree lumens of brightness, and as long as 50 milliseconds of refresh rate.  lumens is defined as the number of times the projector reflects the same light with the same intensity.  It’s been compared to the luminance of spotlights, focusing on what the human eye can see.

There are 3 classes of projectors.  The first is the LCD projector which the majority of consumers are more familiar with.  LCD projectors are just like TVs with a higher lumens output.  They are thin and lightweight, changing the typical projector dimensions.

Thirdly is the DLP projector.  DLP projectors are like TVs with a lower lumens output.  DLP projectors are comprised of millions of tiny pixels.  The projectors technique uses dots of colors to dot the images onto the screen.  This produces millions of colors that mimic the human eye.

The first important fact about LCD projectors is that the pressure of the lumen, static image.  The problem with lumens is it is only constant, unlike other colors such as black.  So a black picture is still as clear as a black and white picture.  You can’t won’t tell the difference unless you eye-test.

The second important fact about LCD projectors is that it is dimensionally compact.  It is compact in dimensions with a short depth and it project a picture with excellent quality.  The dimensions of a DLP projector is about the same as a USER LCD projector.

The third important fact about LCD projectors is that it is lightweight.  A typical projector usually weighs half of what a projector might weigh.  The technical definition of lightweight is half the weight of the projector with the same brightness level, i.e half the brightness of the projector.

Typical projectors weigh in between 10 to 12 lbs.  This is relatively light for a rectangular projector that is normally used to display slides and pictures.

Today projectors are coming with built-in hard drives.  DIY software tools and equipment are available so you don’t have to install a whole hard drive in the machine.  It is thought that laptops might have a hard drive problem since they are moving so much.

It is a good idea to dump your old projector onto a technical college or your local college for refurbishing.  Check the LCD projector’s user manual to make sure the projector is the right power wattage and dimension.

Calibrating an LCD projector is a matter of changing the input and measuring the display contrast.  Manufacturers usually do not include this function in the manual.  The diode, which is the semiconductor device attached to the bright plate, emits electrons to the ground.

A lot of manufacturers still prefer using spotless sources of DC, which means they are not specifically standardized.  This means there are no laboratory standards.

There are two common methods used to test the performance of spot color and DICOM applications and absolute.

icate projectors:  This is a spot colorimeter, with an antenna, that burns the colorimeter thoroughly to demodulate the specimen.  The resulting spectrum resembles a pure white light.


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