tnorthtj@admdev.cut.oz (Tim North) (02/22/90)
Does anyone know if _blue_ L.E.D.s exist? If so, from whom are they available?
Thanx in advance,
Tim North
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--------------------------------------------------------------------------thomas@uplog.se (Thomas Tornblom) (02/22/90)
Yes, they exist. They are *EXTREMELY* expensive, at least when I checked last. An old catalog (1988) that I have has a price of $50 (!) for the blue and about $0.50 for red/green/yellow. Quantities of one. -- Real life: Thomas Tornblom Email: thomas@uplog.se Snail mail: TeleLOGIC Uppsala AB Phone: +46 18 189406 Box 1218 Fax: +46 18 132039 S - 751 42 Uppsala, Sweden
kurthr@tybalt.caltech.edu (Kurth Reynolds) (02/23/90)
Reading in Science News I understand that there are some new processes that promise to lower the prices of the blue LEDs. Important for oh say making TVs out of em I guess. But I'd really like to know what they're using that has such a large band gap, or are they multipliing the frequency?? Please respond via e-mail. kr
mcconnel@b11.ingr.com (Guy McConnell) (02/24/90)
In article <THOMAS.90Feb22153610@uplog.uplog.se>, thomas@uplog.se (Thomas Tornblom) writes: > > Yes, they exist. They are *EXTREMELY* expensive, at least when I checked > last. > > An old catalog (1988) that I have has a price of $50 (!) for the blue > and about $0.50 for red/green/yellow. Quantities of one. I saw them recently in EE Times or somesuch magazine advertised much cheaper than this. Unfortunately, I don't remember the mag, the price, or the company! I'll look for the add again but I recall that they were advertised as "available in production quantities" so they do exist. They were still more expensive than the red/green/yellow ones but several orders of magnitude less than the price you quote above. Guy McConnell Intergraph Corp. Huntsville, AL.
bowman@reed.UUCP (Eric Bowman) (02/26/90)
In article <7568@b11.ingr.com> mcconnel@b11.ingr.com (Guy McConnell) writes: >In article <THOMAS.90Feb22153610@uplog.uplog.se>, thomas@uplog.se (Thomas Tornblom) writes: >> >> Yes, they exist. They are *EXTREMELY* expensive, at least when I checked >> last. >> >> An old catalog (1988) that I have has a price of $50 (!) for the blue >> and about $0.50 for red/green/yellow. Quantities of one. > > I saw them recently in EE Times or somesuch magazine advertised much cheaper > than this. Unfortunately, I don't remember the mag, the price, or the > company! I'll look for the add again but I recall that they were advertised > as "available in production quantities" so they do exist. They were still > more expensive than the red/green/yellow ones but several orders of > magnitude less than the price you quote above. > > > Guy McConnell > Intergraph Corp. > Huntsville, AL. I read something recently about a cost breakthrough that might make LED TV possible -- evidently a *big* cost breakthrough. A friend of mine working in a display group thinks the TV part is bunk, but confirmed about 1/10 recent price reduction. BoBo bowman@reed.{bitnet,UUCP} FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL FILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILLFILL (sorry, our mailer's got an attitude problem)
brodzik@ux1.lbl.gov (Donald A Brodzik) (02/26/90)
The company Ledtronics, 4009 Pacific Coast Hwy, Torrance,CA 90505 lists a 470nm blue led, L200cwb3. Their phone is 213 549 9995. I have no pricing information. D.B.
bvk@hhb.UUCP (Brett Kuehner) (02/27/90)
I tried sending this via email, but it bounced.
"Durham, NC -- Cree Research, Inc. has built the missing link in
full-color light-emitting diode (LED) displays -- a pure blue emission
diode. Three families of silicon carbide blue LEDs use a low power
peak wavelength to produce the purer blue. LEDs are semiconductors
that produce visible when connected to an electrical power source.
List prices for Cree's die are $1.47 in 100,000-unit quantities --
that's about a tenth the cost of the competetion, Cree says. By
combining the new blue with red and green LED chips, designers can
produce any color light in the visible spectrum, including white. For
more information, call Cree at (919)-361-5709."
"For years, the industry has awaited the advent of a blue LED. These
unique silicon emitters are now available at prices between $12 and
$15 each. Operating at 470 nanometer wavelengths, 100,000-hour LEDs
come in both single- and multi-chip configurations. LEDTRONICS, 4009
Pacific Coast Highway, Torrance, CA 90505. (213) 549-9995"
These are both from articles posted to sci.electronics a few weeks
ago.
Brett
--
...!princeton!hhb!bvk
bvk%hhb@princeton
--
Brett Kuehner, Racal-Redac, Mawah, NJ
...!princeton!hhb!bvk
bvk%hhb@princeton.EDUgessel@cs.swarthmore.edu (Daniel Mark Gessel) (02/27/90)
bowman@reed.UUCP (Eric Bowman) writes: > I read something recently about a cost breakthrough that might make LED TV > possible -- evidently a *big* cost breakthrough. A friend of mine working > in a display group thinks the TV part is bunk, but confirmed about 1/10 > recent price reduction. > > bowman@reed.{bitnet,UUCP} Can you give a reference to this article? I'd be interested in looking at it. I called one company and was given a $15-$30 dollar quote if I remember right. By the way, don't somebody make LCD TV's that have pretty good pictures? (I remember seeing a miniature one in a store, but it's reception was bad, so it's picture was too.) I would like to find a dot matrix display panel. LED would be cool, although LCD would be just fine. If anybody can direct me to a catalog or company etc. where I can find such things, please let me know. Thanks, Dan -- Internet: gessel@cs.swarthmore.edu UUCP: {bpa,cbmvax}!swatsun!gessel
bowman@reed.UUCP (Eric Bowman) (02/28/90)
In article <WWKFQ3Q@xavier.swarthmore.edu> gessel@cs.swarthmore.edu (Daniel Mark Gessel) writes: > >Can you give a reference to this article? Nope. Sorry. Can't remember. It may have been in the Portland, OR _Oregonian_ (that bastion of good journalism) in Nov '89 sometime. >By the way, don't somebody make LCD TV's Seiko and Casio make LCD TVs. One or both of them even have color ones. I even think Seiko had a b/w TV watch a few years ago. As far as I know, and the field changes so fast it's hard to remain current, the only LCD TVs are pretty small due to the complexity/cost involved in making them big. The LED TV concept involved full-size flat panel display; hang-it-on- the-wall kind of thing. BObo bowman@reed.{bitnet,UUCP}