Sunday, June 6, 2010

Developments in LCD TVs




During these last few years, LCD TVs have been coming out bigger and cheaper. Yet there is a lot more to the latest developments in LCD display technology than just a more affordable big screen TV. In particular, we have seen a leap in overall picture performance of LCD HDTVs, with sets capable of improved screen uniformity, better off-angle viewing, deeper blacks, more accurate colors, higher refresh rates, improved LCD response times, and high contrast ratios.

This is all apart from cleaner video processing, enhanced features - in particular the latest 'hot' spec of the day - IPTV support with Yahoo widgets found on most premium HDTVs, a thinner profile, and equally important, lower power consumption.

The more expensive LED LCDs using LED backlights with local dimming technology can do better as further explained in our LCD display technology guide here. In particular, both the 55-inch Sony KDL-55XBR8 released in November 2008 and the Samsung 55-inch UN55B8500 released in late 2009 are capable of exceptional overall picture performance that expert reviews say is very much in line with that of the best plasma HDTVs. However, even these very expensive LED LCD TVs have their own issues as well both with viewing angle and blooming - typical of LED TVs using a full array backlight with local dimming technology.

At the same time, even the less expensive edge-lit LED TVs offer significant improvements with respect to conventional LCDs when it comes to the rendering of deep blacks, improved contrast ratios, ultra-slim inch thick profile even at massive 60-inch screen sizes, and improved power consumption that is some 40% less than that of conventional LCD TVs. For example, sets such as the recently released 52-inch EX700 edge-lit Sony LED TV are capable of exceptional power efficiency that no other CCFL LCD or plasma TV can ever achieve.

Mind you, nothing is perfect. Both the 2010 Sony LED TVs and the Samsung 2009 edge-lit LED TVs reviewed on our site suffer from what appears to be lack of brightness uniformity across the full screen area.

This lack of screen uniformity is common with most LED TVs; comparative reviews of the Sony's edge lit LED KLV-40ZX1M LED LCD television show that this exhibits even worse uniformity than the Samsung LED TVs. With 2010 LED TVs, things seem to have improved significantly in this area but at the more expensive price one has to pay for a LED TV, we expect something better...

This is their real problem - LED TV sets are still relatively expensive though the latest price drop we have seen for edge-lit LED TVs makes these LED TVs more within reach of the average household budget. However, expect to spend anything between $600 and $1,000 more than corresponding conventional LCD HDTVs. The popular Samsung LN46B750 1080p CCFL LCD Television is selling at almost $1,700 as against the $2,300 of the equivalent feature spec Samsung UN46B8000 LED HDTV. This difference would shoot upwards with LED TVs using local dimming technology; the recently released high-end Samsung UN46B8500 is presently selling at $3,100. Surely, Samsung UNB8500 series represents the very best LED LCD TV ever released - with superb picture performance irrespective of brand and display technology.

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