Friday, December 19, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
Facebook And Android Top Digital Trends For 2014
Your Next Car Could Have Android Inside
North Korea Linked To Recent Sony Hacking
Sony Global Education Established
CEA and Japan Audio Society to Jointly Promote Hi-Res Audio
Intel, IBM Follow Different Strategies On 14nm FinFET
Toshiba Announces 6TB Enterprise Capacity HDD Models
WebOS 2.0 Smart TV Platfom To Debut At CES
Active Discussions
The Leading Fifa 15 Coins saler
Windows xp
Will there be any trade in scheme for the coming PSP Go?
Hello, Glad to be Aboard!!!
Best optical drive for ripping CD's? My LG 4163B is mediocre.
Hi All!
cdrw trouble
CDR for car Sat Nav
 Home > News > Consumer Electronics > Some Fa...
Last 7 Days News : SU MO TU WE TH FR SA All News

Wednesday, January 21, 2009
Some Facts About LED-backlit LCD TVs


There is some optimism regarding the use of LED backlighting in new LCD-TVs that are expected to appear next summer. But is it worthy to replace your current LCD TV with a new one?

LEDs are used in LCD TVs to illuminate the display. LCDs are a transmissive display type, meaning they do not generate their own light and therefore need a separate illumination source, known as a backlight. Most LCD displays available today have used Cold-Cathode Fluorescent Lamps (CCFLs) as the backlight. However, the declining prices of LEDs are making them a viable competitor to CCFLs.

The mesage issued by LCD-TV makers at CES was clear: LED backlighting and thinner form factors represent the future of the market. The trick for the TV makers was to create thinner sets, which enable thinner designs and are more attractive to consumers.

An advantage of the LED-backlit LCD TVs is the fact that they consume less electricity than their CCFL-equipped counterparts. The majority of LED backlit LCD TVs comply with Energy Star requirements, an attractive feature for consumers, who have come to view the Energy Star label as a guarantee of greenness and reduced energy costs.

While the energy consumption and form-factor benefits of LED backlighting are unquestioned, there is some debate over how much the technology actually improves the image on LCD TVs. Most of the current LED-equipped LCD TVs use edge-mounted designs that place the diodes at the borders of the display. This allows for the thinner form factors that consumers appreciate, but it does not provide any major improvement in contrast ratios, according to Sweta Dash, director of LCD research for iSuppli.

Contrast ratio is the ratio of the luminance of the brightest color to that of the darkest color that a television is capable of producing. Televisions with superior contrast ratios get rid of excess off-state light when a LCD pixel is turned off, delivering a better picture. "In terms of image quality, using a edge-mounted LED backlighting design in a large sized LCD TV is like putting a Ferrari engine in a Ford Pinto," quipped Jagdish Rebello, director and principal analyst for LED research at iSuppli. "There is no improvement in picture quality and the color gamut of the display is actually less than when using a CCFL."

An alternative approach to using LEDs in LCD TVs, the full-array backlight, provides sharp improvements in contrast ratio, according to Sweta Dash, director of LCD research for iSuppli.

"The highest-quality images on LCD-TVs will be on sets that use the full-array backlight approach because it provides the best dynamic contrast ratio, which in turn improves perceived image color and sharpness." said Randy Lawson, senior analyst, digital television semiconductors for iSuppli.

Another aspect of image quality hinges on the type of LEDs used in LCD TVs. Most LED-backlit LCD TVs now employ white LEDs, rather than the more costly Red, Green, Blue (RGB) alternatives. RGB LEDs provide a superior color gamut than white LEDs, providing richer and more varied colors in television sets.

"RGB LEDs are tidy and are the ideal best solution for LCD backlighting," Patel said. "But pricing is still too high and these won?t show up in LCD TVs in significant numbers until 2010." Beyond televisions, LEDs are used for backlighting of desktop monitors and notebook PC LCD displays.

Declines in prices and newer higher-brightness LEDs are enabling their usage as backlights in LCD TVs, according to iSupply. Average pricing for LEDs is on the wane, allowing LED-backlit sets to become more price competitive with comparable CCFL sets.

iSuppli expects LCD-TV makers will offer a mix of thin form-factor edge-mounted designs and high image quality full-array alternatives during the coming years.


Previous
Next
ink Breakthrought Could be Used For Manufacturing of Bendy Screens        All News        Samsung TruDirect Software Available For Download
Significant Gap Between HDTV Ownership and HD Programming Usage Among US Households Reports In-Stat     Consumer Electronics News      Mitsubishi Announces Record Power 638nm Diodes For Projectors

Get RSS feed Easy Print E-Mail this Message

Related News
Sharp Develops Brighter LED for LCD Backlights
LCD TV Panel Shipments Dip in Q3 For The First Time
Sharp To Launch Redesigned AQUOS Quattron G9 LCD TVs
Sony's 2013 BRAVIA TVs Available for pre-Order Now
Global TV Market Won't Recover Until 2015
Panasonic at CES 2013
North America and China TV Shipments Rise Ahead of Holidays
Sharp's 90-inch LED Aquos TV Available In The US
Toshiba 4K REGZA 55XS5 LCD TV Hit Japanese Stores Next Month
Sony's 2012 BRAVIA TVs Hit Stores
LCD Makers To Pay $553 million Over Price-fixing Case
Panasonic To Offer New Online Service for TVs

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .