Projector & Projection Technologies

The best projector technology for the Big Cinema Experience is……

D-ILA (Direct Drive Image Light Amplifier)
technology was developed in Japan. Like DLP, D-ILA projection operates using reflection. The ILA matrix is an LCD matrix as with LCD projectors, but it’s mounted on a metallicised silicon substrate. This results in the advantage of visibility of the often-noticeable LCD matrix (the “screen-door” effect) is strongly reduced and the display is used as a reflector (as with DLP) and not as a transmitter (as it is with LCD).
This results in deeper blacks. D-ILA projectors also exist in several versions: mono- and tri-ILA. For the latter version, each primary colour (red, green and blue) is associated with a different matrix. For mono-D-ILA, the white of the Xenon lamp is broken down into primary colours using holography.
Advantages of this technology:
Generally the best and most accurate to view. Blacks are deep and images are high in contrast. The resolution of the LCD matrices is very high, often much higher than on DLP and LCD projectors.
Disadvantages of this technology:
Price only.

LCD (liquid crystal display)
lets the polarized light through in a single direction while orienting it. The crystals are placed between two electrodes and change orientation under the influence of an electrical field. This modifies the structure of the crystals, the electrical field rendering them either opaque or transparent. The display, made up of millions of liquid crystals, then creates an image. Projectors using LCD technology can be tri- or mono-LCD.
Advantages of this technology:
LCD projectors are more affordable and often of reasonably high quality. On the most recent models, the image is excellent and bright.
Disadvantages of this technology:
Blacks are never completely black, since the crystals are not completely opaque. The crystal matrix is sometimes visible, but that depends above all on the viewing distance of your setup.

DLP (Digital Light Processing)
technology, also called DMD (Digital Micro mirror Device), is based on the principle of reflection. The digital signal is interpreted as commands to micro-mirrors which either do or don’t reflect the light coming from the projector lamp.
The micro-mirrors are set on pivots that allow them to tilt in the direction of the light source (ON position) or in the opposite direction (OFF position). The totality of the pixels form an image made up of light and dark points. But if the process were that simple, we would have the equivalent of an image made up of black and white dots with no gradation. This means that levels of gray have to be generated. To do this, the reflector translates the digital signal of the image into rapid oscillations that move the micro-mirrors several thousand times per second. The more light the micro-mirror reflects, the lighter the gray of the pixel. Conversely, the more the micro-mirrors obstruct the light, the greyer the pixel will be. Varying the switching frequency in this way results in 1024 levels of gray for each pixel.
Advantages of this technology:
Compared to competing technologies, DLP offers a brilliant, colourful, clear image with good contrast. Since the space between each micro-mirror is less than one micron, the space between pixels is greatly limited. As a result, the final image seems sharper. Thanks to the use of mirrors, light loss is greatly reduced and light output is fairly high. Compared to projectors using LCD technology, DLP also offers deeper blacks.
Disadvantages of this technology:
The disadvantage of DLP projectors is what devotees call the “rainbow effect.” Consumer DLP projectors use a transparent coloured disk (chromatic wheel) which turns in front of the lamp. This disk, divided into several primary colours, reconstitutes all the final colours. These primary colours are positioned like the slices of a pie. Depending on the projector, there can be 3 segments (1 red, 1 green and 1 blue), or 4 segments (1 red, 1 green, 1 blue and 1 white), 6 segments (1 red, 1 green, 1 blue, then 1 red, 1 green and 1 blue again), and even 8 segments with several white ones. The fewer the segments, the less rapidly the disk turns, and the more capable the eye is of breaking down the colours. This means that you sometimes see what looks like a rainbow, especially in light areas of the image. Not everyone sees these rainbows. So before buying a DLP projector, be sure to view a few video sequences.

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