LED Technology in XXL Size — Display Measures Two Meters

Jul 22, 2005
LED Technology in XXL Size

Display sizes that were once unthinkable are now possible thanks to Osram Opto Semiconductors’ new backlighting system for displays. A prototype measuring two meters contains 1,120 Golden DRAGON light-emitting diodes (LEDs). The display’s diagonal measurement is 82 inches, about the size of a door. The ready-to-market system is scalable, which means it can be used to backlight much larger areas.

In terms of its practical applications, the system is suitable for backlighting LCD television screens. With its remarkably low power consumption, it generates a minimum of heat and therefore doesn’t require any cooling fans. And that in turn results in lower operating costs. The LEDs from Osram, a Siemens subsidiary, have matured to become nearly on a par with the cold cathode fluorescence technology usually used for LCD backlighting today. According to Osram, only a 20-percent improvement in energy efficiency is needed to close the gap. In addition to using thin-film technology — a reflective coating that ensures minimal scattering within the LED and thus maximum luminosity in only one desired direction — the Golden DRAGON diodes work with an additional special lens, which also originated in the development lab at Osram Opto Semiconductors. And although the system provides an improved display, it requires fewer LEDs for the backlighting.

Work has already begun on the next generation, and when it’s completed, these “backlights” are expected to be even thinner and more cost-efficient. With their very fast switching times (less than 100 nanoseconds), LED-based backlights make possible displays without striation. Plans also call for eventually dispensing with the color filter in the displays’ LCD surface, because the backlights will be able to control the display with the individual primary colors. The very fast image sequencing of the individual colors ensures that the human eye perceives a picture of outstanding brilliance. And ambient temperatures have even less effect on displays using this light source. Until now, the use of LCD liquid crystals has been restricted to a range between minus 40 degrees and plus 85 degrees Celsius.

LED technology has been especially successful in areas of application where its advantages — including service life, precision, small size and special color properties — can be fully exploited. If the light-emitting chips can be made even brighter, though, and production costs and thus the selling price are reduced, the so far relatively expensive LEDs will largely replace conventional light sources for general lighting use by the end of the decade.

Explore further: Coal, medicine, trains top Tokyo's Asia infrastructure plan

Related Stories

Filmmakers look to Twitter, Facebook for stars

7 hours ago

Looking for a tattooed demon to be killed by an undercover virgin in your sex club? Well, as any good horror film producer knows, the best place to look these days is on Facebook and Twitter.

Recommended for you

Adult dating website hack exposes personal data

21 minutes ago

A data breach at a website billed as "the world's largest sex and swinger" community may expose personal and sexual information on millions of users worldwide, a report said Friday.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.