Types of Projectors
The 1960's saw the advent of the slide projector together with overhead projector, which used amidst other components motorized filter wheels, an optical beam shutter together with scanning galvo mirror systems, equally good equally an electrical incandescent low-cal bulb, a reflector together with a condenser lens to at nowadays the light.
The agency a slide projector together with overhead projector move is past times using a real powerful element of group VII light equally the low-cal source to projection an paradigm through a transparent slide via a condenser lens, which together with so enlarges the image. To avoid burning the fragile slide together with lens, a high-flow blower is needed equally good equally a rut absorbing drinking glass placed inwards betwixt the condenser lens together with slide.
How an LCD video Projector work
Between the years 1980's together with 2000's, the starting fourth dimension liquid-crystal display (LCD), digital-light processing (DLP), liquid-crystal on silicon (LCOS) together with Light Amplification by Stimulated Emission of Radiation video projectors were conceived together with brought to market.
The basic technology behind an LCD video projector consists of an LCD, a high CRI (color-rendering index) LED low-cal source, a high-intensity discharge light (HID lamp) together with ballast amongst a condenser together with collector Fresnel lens. LCD video projectors move by sending a beam of white low-cal through iii drinking glass color mirrors that are peculiarly shaped to reverberate red, blue, together with light-green wavelengths. Each beam of colored low-cal is together with so fed to an LCD panel, which receives an electrical quest that tells it how to conform the pixels inwards the display to exercise the image.
How a DLP video projector works
The digital-light processing (DLP)video projector uses an optical semiconductor chip which has on its surface thousands upon thousands of microscopic mirrors arranged inwards a rectangular array. Each mirror on this fleck tin live independently adjusted closer or farther from the low-cal source to exercise a night or low-cal pixel. Color is fed to the fleck past times a beam of low-cal that passes through a spinning color cycle earlier it reaches the chip. After color reaches the chip, the paradigm is fed through the lens together with onto the projection screen.
How a LCOS video projector works
The liquid-crystal on silicon (LCOS) video projector combines LCD's liquid crystals together with DLP's micro-display technology past times applying liquid crystals to a reflective mirror layer. As the liquid crystals opened upward together with close, the low-cal is either reflected from the mirror below, or blocked to remainder the light, thence creating the image. LCOS video projectors typically exercise iii retentiveness chips, i each to remainder low-cal inwards the red, green, together with bluish channels to deliver them simultaneously. LCOS video projectors deliver real high paradigm resolution together with a typical LCOS projector costs upwards £3,000. Quality LCD together with DLP projectors tin live bought for unopen to £200 together with £600.
How a Laser projector works
Laser video projectors exercise solid-state lasers (essentially pocket-size LEDs), which are specifically designed to exercise the required color wavelengths without the remove of filtering required amongst LCD, LCOS together with DLP video projectors. Laser video projectors are are "the creme de la creme" of video paradigm projection equally they offering a lot of benefits such equally less rut generated, improve ability consumption together with life bridge (around 29,000 hours compared to the 3,500 hours a typical LCD projector volition last). Laser projectors are priced upwards £6000.
The video projector technology has many dandy applications such equally the IMAX Dome, which is a projector which projects images of celestial objects onto the dome inwards a planetarium. This plentarium projector technology has likewise expanded to domicile planetarium projectors such equally the Sega Toys Homestar Planetarium (pictured).