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  2. 2. FRONT VIEWFrom an entertainment point of view there is probably nothing more impressive thangoing to a first run cinema (front projection) and being enveloped by the large screenand catchy plot. Thats great if the purpose is for entertainment or large scaleaudiences. However, if the purpose is to explain a project topic or concept, a differentsystem may be desired. When we are giving lectures or presentations we tend to movearound and interact with our slides and graphics
  3. 3. REAR VIEWA large-screen TV set that uses one of several technologies for generating theimage. All methods yield larger screens than the one-tube, direct view CRTTV, which reached a practical limit of 36". The depth of rear screen sets isreasonably shallow because the image is projected through a series of lensesand mirrors that flip it back toward the screen.
  4. 4. CRTA CRT projector is a video projector that uses a small, high-brightness CRT(or picture tube) as the image generating element. The image is then focusedand enlarged onto a screen using a lens kept in front of the CRT face. Mostmodern CRT projectors are color and have three separate CRTs (instead of asingle, color CRT), and their own lenses to achieve color images.The red, green and blue portions of the incoming video signal are processedand sent to the respective CRTs whose images are focused by their lenses toachieve the overall picture on the screen.
  5. 5. LCDAn LCD projector is a type of video projector for displaying video, images orcomputer data on a screen or other flat surface. It is a modern equivalent ofthe slide projector or overhead projector. To display images, LCD (liquid-crystal display) projectors typically send light from a metal-halide lampthrough a prism or series of dichroic filters that separates light to
  6. 6. DLPDigital Light Processing is a brand of projector technology that usesa digital micro mirror device. It was originally developed in 1987 by Dr. LarryHornbeck of Texas Instruments. DLP is used in a variety of displayapplications from traditional static displays to interactive displays and alsonon-traditional embedded applications including medical, security, andindustrial uses.
  7. 7. LUMENSA major factor in choosing a projector for a particular audiovisualpresentation application is the level of brightness that the projector is capableof outputting. You may have seen brightness specifications quoted in ANSIlumens and wondered what these are and how they are defined. This BambooAV advice article should enable to you to make accurate comparisons betweenmultimedia projectors of varying levels of brightness.
  8. 8. THROWIn film terminology, throw is the distance of a movie projector from thescreen. It is the distance the image is thrown onto the screen, and it has a largeeffect on screen size. Often in home theatre individuals lack the correct throwdistance in the room but can buy a short throw lens. There are also "longthrow" lenses available. A related term, throw ratio, refers to the ratio of thedistance to the screen (throw) to the screen width. A larger throw ratiocorresponds to a more tightly focused optical system.
  9. 9. LAMPA projector lamp is used to transfer an image from a multimedia projectoronto a larger screen for an audience to view. The projector lamp has beenused in businesses and educational organizations for many years in order tohelp convey information to an audience. The projector lamp is also used formovie or home theaters, where it sends DVD or film images to a large screenfor all to see. The technical description of a projector lamp is that it is anultra-high pressure mercury vapor ARC lamp.Projector lamps are scientificallycategorized as metal halide lamps andPhilips has trademarked the name"UHP lamp" for their projector lamps.
  10. 10. WERE I GOT THINGS,1237,t=rear-projection+TV&i=50285,00.asp