Projection
A projection is a two-dimensional image shown on a flat surface and produced by a projector. The image is shown on a neutrale projection screen, normally in a different size (smaller or bigger) then the original picture.
Physics of the optics
Optics is a branch of physics that describes the behavior and properties of light and the interaction of light with matter. The visible light is that part of the electromagnetical spectrum between 380nm to 780nm.
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Projections techniques
Front projection
The more common front projection systems having the image source situated on the same side of the screen as the audience.
Rear projection
The rear projection send the images from behind the projection screen. The projector itself is facing against the audience.
Projector database
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Projectors
Here is an overview of the current used projector-technology.
LCD Projectors
LCD projectors typically send light from a Metal halide lamp through a prism that separates light to three poly silicone panels - one each for the red, green, and blue components of the video signal. As polarised light passes through the panels (combination of polarizer, LCD panel and analyzer), individual pixels can be opened to allow light to pass or closed to block the light. The combination of open and closed pixels can produce a wide range of colors and shades in the projected image.
DLP Projectors
In DLP projectors, the image is created by microscopically small mirrors laid out in a matrix on a semiconductor chip. DLP is also one of the leading technologies used in digital cinema projection.
LED Projectors
In LED projectors, the light source is the Light Emitting Diode; the picture itself comes, similar to the DLP projects, from a DLP element. LEDs produce more light per watt than do incandescent bulbs; this is useful in battery powered or energy-saving devices. LEDs can emit light of an intended color without the use of color filters that traditional lighting methods require. This is more efficient and can lower initial costs. First products on the market are i.e. Samsung SP-P300ME Pocket Imager, Toshiba FF1 or Mitsubishi PT10 Pocket Projector. The smallest product on the market ist the Voigtländer DLP200L.
LCOS Projectors
Liquid crystal on silicon (LCOS or LCoS) is a "micro-projection" or "micro-display" technology typically applied in projection televisions. It is a reflective technology similar to DLP projectors; however, it uses liquid crystals instead of individual mirrors. By way of comparison, LCD projectors use transmissive LCD chips, allowing light to pass through the liquid crystal.
Laser-Projectors
The video signal is introduced to the laser beam by an acousto-optic modulator (AOM) that uses a photorefractive crystal to separate the beam at distinct diffraction angles. Due to the special features of laser projectors it is possible to project images or data on any kind of projection surface. Typically sharpness, colour space and contrast are higher than that of other projection technologies.