Widescreen Format

The conventional projectors or handle a format called 4:3 ratios, i.e. have 4 units wide by 3 high.

The home theater projectors to handle the so-called Wide Screen or 16:9 format, which is a ratio of 16 units wide by 9 high.

If you see a movie on DVD to your TV, you will notice that many of the films shown some black UP AND DOWN OF THE IMAGE, so that the image is small, or if the stripes are not the image are elongated (This depending on output format defined in its DVD player).

This is because more and more movies coming in FORMAT ORIGINAL FILM, known as WIDE SCREEN, which seeks not to cut anything from the movie.

In several countries, mainly the United States and Europe, sales of TVs or plasma screens and is the Wide Screen format, as for example in the U.S. today there are already more than 1000 channels with digital HDTV technology.

Resolution

In the market for home theater projectors, there are basically 2 resolutions:

WVGA of 854x540 pixels, which corresponds to the standard video resolution of 480 lines.

WXGA 1280x768 pixels, which corresponds to one of the two orders of High Definition Television (HDTV), the latter decision is the most recommended.

Comparing with WXGA XGA (of 1024x768), WXGA has 921,600 pixels to 786,432 pixels, but to deploy a movie in a single XGA used 576 lines of 768, which are used only 589,824 pixels, this represents WXGA compared to 56% More pixels.
It is also important that a WXGA projector does not have to do compression and adjustment processes in HDTV signals of 720 lines.

Contrast

The contrast ratio is the comparison between Black and white, with forming this relationship is greater black colors will be more blacks.

This contrast ratio is more important for home theater projectors that use of boardrooms.

Currently projectors for home theater with LCD technology have relationships 2000:1 contrast, similar to that achieved with the projectors with DLP technology.

Brightness

The condition recommended to enjoy a home theater is dark or twilight low.
Projectors for home theater that is why are not so bright. Because if we use a conventional projector 2000 lumens for home theater, is too light if you see a dark, that gets to create headaches for people.

Most projectors for home theater have luminosities around 1000 lumens, considering that a 100-inch screen is bright enough to enjoy a good movie.

The technology of LCD projectors are able to increase the contrast of 500:1 which is handled in conventional LCD projectors to 2000:1 on computers to home theater, in some cases using the Dynamic Iris technology.

Color range

To achieve good picture quality requires a projector with good handling of colors.

Projectors for home theater with video processors that handle the processing of the image with a greater number of possible values, this is a greater range of colors, which allows images to see much more defined.

Conventional projectors handle 8 bits, which can reach 16.7 million colors with 10 bits while achieving 1073 million colors, this is 64 times more.

This is because each panel LCD can handle 10 bits of dark 1024 levels, while 8 bits are only 256 levels, acquire to the possibilities of darkness of the 3 LCD panels will rise to these levels of dark bucket to get the possible colors.

Component Video / Digital Inputs

Projectors for home theater typically have component video input RCA type (3 connectors bring the DVD players), while most of the computer, if it is handled by the same RGB input using a cable that converts from RGB to RCA (3 connectors).

The component video input provides a higher quality image, that the S-Video, and the lower-quality Composite video input.

New projectors for Home Theater Digital has a new entry, known as HDMI, a digital video input, which in terms of video is equal to DVI-D, only this cable / connector also handles the Digital Audio.

The digital inputs are given high quality. By using a DVD player, the signal recorded on a DVD is digital and the display of a projector is also digital. Using this kind of signal avoids the digital-analog conversion in the DVD, Digital and Analog-in projector.

The standard equipment for High Definition HDTV is HDMI.

Video Processor

Most projectors for home theater have a more sophisticated video processor that they handle conventional projectors. This processor in addition to managing the conversion of image with more bits, manage a process for converting videosignals into progressive interjection. Normally this process is known as a folder lines. This gives a signal of more stable, sharper and brighter.

This process of progressive video is produced another great benefit: the video image is handled at 30 frames per second (with two fields per frame), and the film is made of 24 frames per second, there is a differential of 5 against four tables, per second.

To make this conversion will have to create fifth box, which is generated by mixing a field in a table with another to generate the missing paintings.
This generates tables as we can see from the 2nd or 3rd box.

In this progressive Video above and does not happen, because the screen is completely in every field, or 2 per box.

Zoom

In most conventional projectors that handle the Zoom can cause the image size between 20 and 30%.

The new home theater projectors to handle more powerful zoom capability of taking the screen to increase between 50% and 100%.

This allows us to get the projector with a range from greater distances.
For example, with Panasonic AE700 projector, if we have a screen 2.40 x 1.35 meters projector can be at a distance from 3.32 to 6.64 meters.

Movement of Lens

Conventional projectors to correct the shape of the image generally use the keystone correction, this being a process of correction for digital compacts, it removes quality and sharpness of the image.

The new projectors to cinema at home instead of using the Keystone correction using the technology of the Movement of Lens ( "Len Shift") which makes moving the projection without moving the projector and mostly without losing image quality.

These teams allow a displacement of the lens both vertical and horizontal, giving more versatility to the placement of the projector

Grid

The grid is a small line that separates one point or another pixel. Depending on the width of this technology varies. DLP technology is that this is the thinnest, and in this LCD is thicker.

In a number of projectors for home theater technology to handle a softener LCD screen which virtually eliminates the grid, thus achieving a great smoothness of the image.