The technical side of LED video displays
If you've been aware that video display systems that reflect the image to you from a white screen
have their limitation on the amount of room light that can be used over the students, then you may have read some
of our earlier links to information about flat plasma displays and LED displays.
You may remember this picture of an LED display from our Dec.04.2000 page
Since both plasma and LED displays are "emissive" rather than reflective, they can give the deep blacks that you are used to on your TV set or computer monitor... even with a LOT of ambient room light. In classrooms, that means that your kids can have more light on their desks and papers, and still see a picture that doesn't look washed-out.
Now, for all you people who'd like to know more about the technical side of these LED displays, here's a link to a favorite author, Peter H. Putnam - giving lots of good techie stuff. These LED displays work great in large rooms, but aren't quite ready for small classrooms yet... but they're getting closer all the time.
This is a great time to learn about comparative candelas-per-square-meter, pixel size, viewing distances and contrast for these new animals. And... read the specs for the giant LED displays installed in both the Ohio State and the Univ. of Arkansas stadiums!
After you get to his page, click on the article "LED Large Screen Displays" Click on http://www.phpcom.com/
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