An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern equivalent of the slide projector or overhead projector. To display images, LCD (liquid-crystal display) projectors typically send light from a metal-halide lamp through a prism or series of dichroic filters that separates light to three polysilicon panels – one each for the red, green and blue components of the video signal. As polarized 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.
History[]
1980s[]
Breakthroughs occurred in new materials and thin-film structures, with Hitachi of Japan as a pioneering company. Such AM LCDs became commercially available in the early 1980s.
Early pioneers of LCD projection in Japan were Epson and Sharp Corporation,[1] which developed color video projectors in the 1980s.
Epson developed the 3LCD color projection technology in the 1980s, and licensed it for use in projectors in 1988.[2] Epson's VPJ-700, released in January 1989, was the world's first compact, full-color LCD video projector.[3]
2000s[]
Since 2005,[4] the only remaining manufacturers of the LCDs for LCD projectors are Japanese imaging companies Epson and Sony. Epson owns the technology used in modern projectors, 3LCD, which it developed in the 1980s.[2] To market 3LCD projector technology, Epson also set up a consortium called the "3LCD Group" in 2005 with other projector manufacturer licensees of 3LCD technology that use it in their projector models.
See also[]
- Comparison of display technology
- 3LCD
- CRT projector
- Handheld projector
- Movie projector
Notes[]
- ↑ [1]| Hornbeck, TI: From cathode rays to digital micromirrors: A history of electronic projection display technology
- ↑ 2.0 2.1 Find out what is an LCD Projector, how does it benefit you, and the difference between LCD and 3LCD here, Epson
- ↑ Michael R. Peres, The Focal Encyclopedia of Photography, page 306, Taylor & Francis
- ↑ [2] Epson Merger
References[]
- Powell, Evan (2002). "Epson's 730c: Best of Class in 2000-Lumen Portables", projectorcentral.com
- Business Wire (2005). "Leading Projector Manufacturers Fujitsu, Hitachi, Panasonic, Sanyo and Sony Join Forces with Epson to Educate the Market about
- Benefits of Three-Panel, Liquid Crystal Display Technology", projectorcentral.com
- Lawler, Richard (2006). "LG's 100-inch LCD set for mass production", Engadget
- Breeden, John (2009). "LCD monitors go big, with mostly good results", GCN, p. 3
Further reading[]
- Fischetti, Mark (November 2007). "Two Technologies Shine". Scientific American: pp. 110–111. "Two technologies – micromirrors and liquid-crystal displays (LCDs) – have been vying for these markets, but they are doing equally well in today's home and business areas...."