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LED-backlit digital signage increases sunlight readability, reduces cost

Industrial-grade LED backlights provide better readability in ambient light conditions for digital signage and advertising. Starting in 2010, Caltron will offer LED-backlit technology in digital signage, such as the 1,600-nit (candle light per square meter) brightness system in Caltron’s 12.1-inch High Bright LCD Open Frame Monitor (HBT-12120). This provides a brightness level five times greater than CCFL technology.   “LED backlights are more powerful and more cost-effective for digital signage than CCFL backlight tubes,” says Jim Wang, president of Caltron Industries. “They are perfect for digital signage advertising, outdoor presentation systems or any other situation with high ambient light conditions.”

Most off-the-shelf LCD monitors have a brightness rating around 300 nits, a level with insufficient luminance for outdoor or bright-environment viewing that creates a grainy, low-quality image. The traditional solution is the costly installation of multiple CCFL (light bulb) backlight tubes. However, this also requires a thermal management solution to dissipate excess heat generated from backlights. Cumulatively, all of these upgrades create an arduous and costly process.

“CCFL solutions require cost-heavy thermal management, like heat exchanges, piping or cooling fans. When the goal is simply good visibility in ambient light, that’s a lot to ask for,” Wang said. “Caltron uses LED backlights for digital signage because it makes sense for the operator and the viewer. It’s cost-effective, easy to use, and it works well in almost every circumstance.”

Caltron has partnered with high-bright panel suppliers on new backlight solutions through seven years of research and development. This technology has undergone rigorous testing, including nearly 10,000 hours of backlight aging tests. The net result is a 1,600 nit high-bright screen that consumes less than 24 watts (about half of similarly equipped CCFL backlit panels) for lower power consumption without any loss in brightness or MTBF (Mean Time Between Failure).

digital signage increases sunlight readability, reduces cost