A video projector takes a video signal and projects the corresponding image on a projection screen using a lens system. All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings. A video projector, also known as a Digital Projector, may be built into a cabinet with a rear projection screen (rear projection TV, or RPTV) to form a single unified display device, now popular for home theater applications. The cost of a device is not only determined by its resolution, but also by its light output, acoustic noise output, contrast, and other characteristics. While most modern projectors provide sufficient light for a small screen at night or under controlled lighting such as in a basement with no windows, a projector with a higher light output is required for a larger screen or a room with a higher amount of ambient light. There are different projector technologies; one of the useful and famous techniques of video projection is CRT projector which uses cathode ray tubes. This typically involves a blue, a green, and a red tube. Minimal maintenance is required for this projector technology. A plasma display is made up of many thousands of gas filled cells that are sandwiched in between two glass plates, two sets of electrodes, dielectric material, and protective layers. The address electrodes are arranged vertically between the rear glass plate and a protective layer. LCD projector uses LCD gates. This is the simplest system, making it one of the most common and affordable for home theaters and business use. Its most common problem is a visible screen door or pixilation effect, although recent advances have minimized this. It is one of the widely used projector. DLP projector uses DLP technology of Texas & Instruments Company. This uses one, two, or three micro fabricated light valves called digital micro mirror devices (DMD). The single and double DMD versions use rotating color wheels in time with the mirror refreshes to modulate color. D ILA jvcs direct drive image amplifier is based on LCOS technology. Direct drive image light amplifier is based on LCOS technology. LED uses an array of LED as the light source, negating the need for lamp replacement. Today, video projection is used by many studios, animation & movie industry to project high definition movie behind the scenes. Also, it is universally growing because of its built in application in video conference. It is the milestone of 21st century.