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Optoelectronics/Displays??

Low power, green designs define future LCD trends

Posted: 10 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:low power LED? green design? next-gen TFT-LCD?

Cost effective design, power savings and green initiatives, along with the 16:9 aspect ratio for notebook and LCD monitor panels are the leading trends for 2009. These are the top panel development trends reported DisplaySearch in its "Large Area TFT-LCD Product Plan Report."

According to DisplaySearch, some delays in LED products in the notebook application were due to LED standardization on 16:10 notebook panels this year, but panel makers used LEDs in over 90 percent of 16:9 notebook panels. When panel makers develop 16:9 notebook panels, they design the LED backlight at the same time. Thus, notebook brand makers will migrate to LED quickly when launching their new 16:9 notebook products. Some panel makers also announced their notebook panels will all use LED backlights after 2010. Moreover, notebook panel makers did not increase their brightness on mainstream models, but focused on the weight and power consumption for future plans.

Environmental responsibility and lower power consumption have become primary design concepts for LCD monitor panels. By reducing the number of lamps from four to two, total panel power consumption is reduced by 30 to 40 percent. However, there is a tradeoff between power consumption and brightness. Models with two lamps can only reach 250 to 270nits, using prism films and a two-diffuser design. If LCD monitor panels need to maintain 300nits, panel makers need to add another dual brightness enhancement film (DBEF). Thus, costs actually increase if the brightness is held to 300nits while the number of lamps is reduced.

In LCD TV panels, most suppliers segment models into different categories of specifications to cope with the price trends. Entry-level models typically offer brightness of 400 to 450nits and a 2,000:1 contrast ratio. In mainstream HD models, brightness is typically 450 to 500 nitsand contrast ratio is in the range of 2,500:1 to 3,000:1. For premium models over 37-inch, the brightness is 500nits, and the contrast ratio is upgraded to 5,000:1. In addition, DisplaySearch found that panel makers only implemented 120Hz with 10bits on full HD models from 2H 08. LED backlights were only used in sizes of 42-inch and above. LCD panel makers also used front mount bezel (FMB) to reduce the mechanical cost and provide a slim design for LCD TVs. Green products and power-saving improvements were found in LCD TV panels, including power consumption reduced by 30-40 percent in roadmaps for 26-inches to 42-inches.





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