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White displays?

M

Michael

Jan 1, 1970
0
Has anyone ever seen any white led 7 segment displays?

Do they exist?
 
T

Tim Shoppa

Jan 1, 1970
0
Has anyone ever seen any white led 7 segment displays?

Do they exist?

Blue LED certainly exists (I reviewed Lite-On LTS-5501AB here in this
newsgroup several years ago) but I've yet to see white, even though
the semiconductor technology should be similar.

Numitrons have nearly-white segments, especially at 7V, but the
filaments tend to burn out quick if you run them there :).

I've also seen 7-segment displays built with 4-foot flourescent tubes!

Tim.
 
K

Ken Smith

Jan 1, 1970
0
Blue LED certainly exists (I reviewed Lite-On LTS-5501AB here in this
newsgroup several years ago) but I've yet to see white, even though
the semiconductor technology should be similar.

Just a thought:

The normal white LED is really a blue one pumping a phosphor. If this
same phosphor was made part of plastic sheet over the face of the display
you may get a white display.

I'm thinking of paints like "international orange" that usually contain
frequency down converting materials. When you add some blue directly from
the LED, you will see white.
 
J

jasen

Jan 1, 1970
0
Has anyone ever seen any white led 7 segment displays?

Do they exist?

put a yellow fluorescent filter in front of a blue one?

Bye.
Jasen
 
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