LED Technology in XXL Size — Display Measures Two Meters

July 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.

Related Stories

Recommended for you

Microsoft describes hard-to-mimic authentication gesture

August 1, 2015

Photos. Messages. Bank account codes. And so much more—sit on a person's mobile device, and the question is, how to secure them without having to depend on lengthy password codes of letters and numbers. Vendors promoting ...

Netherlands bank customers can get vocal on payments

August 1, 2015

Are some people fed up with remembering and using passwords and PINs to make it though the day? Those who have had enough would prefer to do without them. For mobile tasks that involve banking, though, it is obvious that ...

Earth flyby of 'space peanut' captured in new video

July 31, 2015

NASA scientists have used two giant, Earth-based radio telescopes to bounce radar signals off a passing asteroid and produce images of the peanut-shaped body as it approached close to Earth this past weekend.

How bees naturally vaccinate their babies

July 31, 2015

When it comes to vaccinating their babies, bees don't have a choice—they naturally immunize their offspring against specific diseases found in their environments. And now for the first time, scientists have discovered how ...

Image: Hubble sees a dying star's final moments

July 31, 2015

A dying star's final moments are captured in this image from the NASA/ESA Hubble Space Telescope. The death throes of this star may only last mere moments on a cosmological timescale, but this star's demise is still quite ...

Exoplanets 20/20: Looking back to the future

July 31, 2015

Geoff Marcy remembers the hair standing up on the back of his neck. Paul Butler remembers being dead tired. The two men had just made history: the first confirmation of a planet orbiting another star.

0 comments

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.