5:59 p.m. - 2006-11-02
LCD Projector
An LCD projector is a device utilized for displaying video images or data. They are the modern equivalent to the slide projector and overhead projector used in the past.
LCD (liquid crystal display) projectors usually contain three separate LCD glass panels, one each for the red, green, and blue components of the video signal. Light from a halogen lamp, which outputs an ideal color temperature and a broad spectrum of color is split by a prism into the three component colors. As light passes through the LCD panels, individual pixels can be opened to allow light to pass, or closed to block the light, as if each little pixel were fitted with a Venetian blind. This activity modulates the light and produces the image that is projected onto the screen.
With a lens that "projects" the image on any flat surface and does not require large "furniture" (like a big TV would), LCD projectors tend to be smaller and much more portable than older systems. The best image quality can be accomplished with a blank white or grey surface to project on, and for this reason dedicated projection screens are often used.
Early systems were often intended to be used with existing overhead projectors, built as a large "plate" that was put on the projector in place of the transparencies. This provided the market with a stop-gap solution in the era when the computer was not yet the universal display medium.
This technology is employed in some sizes of rear projection television consoles, as there are cost advantages when employed in mid size sets (40 to 50 inch diagonal). This is not expected to have much longevity in the "home theater" marketplace due to expected improvements cost/performance of competing technologies, particularly in direct-view LCD panels at the lower range of sizes and DLP projection in the larger sizes.
In 2004 and 2005, LCD front projection has been enjoying a come-back because of the addition of the dynamic iris which has improved perceived contrast up to the levels of DLP.
In early 2006 three-panel LCD projectors were significantly cheaper than three-chip DLP projectors. In part because of the rainbow effect three chip/panel projectors are considered better than single chip/panel projectors for TV and home cinema.
The basic design of an LCD projector is frequently used by hobbyists who build their own HDTV projection systems. The basic technique is to combine a high CRI HID lamp and ballast with a condenser and collector fresnel, an LCD removed from a common computer display and a triplet.
My Friends Blog:
consolidate debt loan , register web page , cingular cellular phone , life insurance broker , domain name lookup , pay for click , ads per click , voip speed test , bad debt expense , linux server hosting , vonage voip phone , credit card applications , group health insurance , cheap web hosting , auto cheap insurance , home owner insurance , hard drive recovery , notebook computer rental , health insurance cost , broadband phone service , debt consolidation services , visa gift card , satellite phone rental , anti virus software , best spyware blocker , purchase domain name , help desk software , debt recovery solutions , email marketing services , computer rental uk , lcd projector rental , one credit card , voip phone service , chase credit card , cheap asp hosting , best website hosting , dedicated server hosting , web hosting reviews , free anti spy ware , register internet name , consumer credit counseling , spyware removing tools , visa credit cards , accept credit cards , credit card processing , internet phone calls
0 comments
