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Television Terms - Understanding How Rear Projection HDTVs work by WAI WAI
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Television Terms - Understanding How Rear Projection HDTVs work by WAI WAI
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Article Posted: 02/08/2011 |
Article Views: 103 |
Articles Written: 2675 - MORE ARTICLES FROM THIS AUTHOR |
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Television Terms - Understanding How Rear Projection HDTVs work |
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Electronics,Science & Technology
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Rear Project TVs have been around for some time from the time of CRT based rear projection TVs to newer rear projection TV technologies like DLP, LCD and LCoS. The evolution of rear projection HDTV has brought rear-projection out of the failed days of CRT rear projection. For those unfamiliar with rear-projection TV technologies such as DLP stands for digital light processing. As with the older CRT rear-projection, a mirror or mirrors: 1.3 million of microscopic mirrors, each corresponding to one pixel in an image is the key to DLP & LCD rear projection HDTV’s functioning. These mirrors are placed on the top of a chip called DMD (digital micro-mirror device) and each one is about 1/5 the width of a human strand of hair. A lamp light source beams through a colored spinning wheel and hits the chip. The tiny mirrors tilt and rotate stimulated by several electrostatic discharges and reflect the colored beam of light unto the screen. The DMD chip can display high-definition images (720 or 1080 pixels) with 16.7 million colors. “Rainbow effect”: some sensitive eyes notice the rapid changing of color spectrum (red, green, blue) caused by spinning wheel between the lamp source and the DMD chip. Please do not mistake flat-panel LCD TVs with rear-projection LCD. While in DLP rear-projectors the light is reproduced by the mirror-coated DMD chip, an rear-projection LCD HDTV goes through a liquid crystal chip made of several pixels to create an image. An electric current fuels the pixels to let the light go through or to block it. The system uses three colored LCD chips (red, green and blue) to create the final color image. Resolution depends on the number of pixels contained in the chip – as compared to a rear-projection DLP HDTVs, rear projection LCD HDTVs can go as high as 768 but does not achieve Full HD status (1080p). Pros of DLP & LCD rear-projection HDTVs • First-rate black level and contrast ratio • Better viewing angles than that of CRT rear-projection TVs. • No burn-in as with plasma • Less bulky sizes than those of CRT rear-projectors although LCD rear projection LCD HDTVs are bulkier than rear projection DLP HDTV. • Low energy consumption. Cons of DLP & LCD rear-projection HDTVs • Chip substitution can be expensive • Poor black level: the closest it gets is a very dark grey. • Fixed number of pixels. • Defective pixels.
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