Anyone make a 5mm hi 5x7 dotmatrix led?

Go To Last Post
36 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I've used hp and osram 'intelligent' 4 character 5x7 displays but the darn things cost $40 a pack. If there was a small 5x7 array of leds that was Real Cheap, I could drive it from a tiny. Consumer product... cost sensitive... $40 is the show stopper.
Lots of 5x7 dot matrix packs 1" hi. I want 5mm.... .27" Ever heard of something like that?

Imagecraft compiler user

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I'd love to find something like that!

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Do you mean 5mm high?
the smallest led I find is 0402 case (1x0.5mm -- 1.2x0.7 footprint)) that mean the minimum 4.9x6 or 8.4x3.5mm ( supposing at you can place so close and not sure if it is possible without testing)
Thierry
Ref Everlight:
http://docs.google.com/viewer?ur...

Thierry Pottier

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

The only display I know of is the TIL305, presumably the first 5x7 dot matrix LED display that came out in the early seventies. I known these are second sourced, even today, but cannot find them. I guess these are quite expensive too.

These LED displays are only feasible in products where price of the display is dwarfed by the costs of the rest of the system; e.g. military stuff, 100+ channel mixing desks and stuff like that.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

How about this one?
http://www.avagotech.com/pages/e...

Mouser only has 30 in stock though.

http://br.mouser.com/ProductDeta...

Allied says 640 can ship in 10 days;

http://www.alliedelec.com/Search...

Hope this helps you...

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

bobgardner wrote:

Lots of 5x7 dot matrix packs 1" hi. I want 5mm.... .27" Ever heard of something like that?

Hi Bob,
Would these be any good http://www.allspectrum.com/store...

Only about 65 in stock but it looks like they can get more.

Regards
Dez Ellis

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Those look like 7 seg. I want to do scrolling alpha....

Imagecraft compiler user

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hi,
Sorry Bob, they are seven segment not 5x7 arrays my mistake.

Regards
Dez Ellis

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

What about the thinking to make your own.A column of seven leds and 5 rows each.Driving a column is like driving a 7 segment led display and all this is multiplexed as five digit led display.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I like the four-chars-in-a-dip like the HCMS2353, but they are $40 a pack. If someone made a 'dumb' quad 5x7 array in a dip WITHOUT the smart driver chip, you could use a 50 cent minidip micro to drive it. Maybe some china display guy will see this message and ask his production engineer how much a knockoff HCMS2353 without the smart guts would cost. I dont even see any way to contact anyone from avago to suggest a product. Elitists.

Imagecraft compiler user

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

What you want exists, made by HP:

http://www.decadecounter.com/vta/articleview.php?item=853
Parent page http://www.decadecounter.com/vta/tubepage.php?item=33&user=0

But being a military device that can survive an atomic attack without a scratch you likely pay more then $40 :)

I think the cost is in the massive wirebonding that is necessary and the enormous amount of die placing. You're talking about 5x7x4=140 LEDs that all need to be placed very accurate. The cheap, bigger sized 5x7 display don't need this accuracy because there's a diffuser panel over them.
And lastly, these LED displays are inefficient in many ways and as such are a niche product, good for a fighter plane, generator voltage readout in a airliner, or a 256 channel studio mixing desk. Some exotic PC motherboards use one for POST information; sometimes a few on a frontpanel of a high end server.

Anyway, I don't think you can use this technology cheaply. For a mass produced product you could investigate using a custom VFD; the optic qualities are just as good.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Super small LCD module.

Attachment(s): 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

That vintage equipment page was neat. Thanks for that link. Everyone wanted to build a bcd clock for a project back in the early 70s.... 6 7490s, 6 7447s and 6 MAN3As which were pricey then.

Imagecraft compiler user

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Does anybody know what displays the early Motorola Microtac Cell phones used?

http://en.wikipedia.org/wiki/Fil...
or
http://en.wikipedia.org/wiki/Fil...

I'd be surprised if they were using those pricey HP displays (but I could be wrong).

I'm looking for some very small and cheap led alphanumeric display myself. It appears that OLED may be the way to go.

Seems crazy that you can get these wee beaties for under 8 bucks (USD) delivered. click for EBAY LINK

Looks great if you can mount and drive them (which I'm about to find out for myself because I just ordered a couple).

-carl

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I think they used them, but in mass production they would be far cheaper. And in those times a cell phone cost a small fortune, the cost of the display was only a fraction I guess.

Those OLEDs are neat, you can also get them quite cheaply in regular distribution. When resolution goes beyond 128x64 prices go through the roof though.

I have video on YouTube of one I used once.

But the connections are difficult as they are meant to be soldered, no connectors exist for them. They also need a bunch of components for a boost converter for the necessary 9..12V for the OLED panel.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

jayjay1974 suggested that the Texas Instruments TIL305 was the first 5x7 dot matrix LED display, but actually it was a clone of the earlier Monsanto MAN2A.  Monsanto sold their optoelectronics operation to General Instruments, and I don't know what ultimately happened to either the GI or TI opto divisions, but as of September 2017 Lite-On still makes a clone of the MAN2A/TIL305, with the part number LTP-305HR, and it is still readily available and relatively inexpensive ($3.67 for quantity 1 from Digi-Key).

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

You are 7 3/4 years too late with your reply.

John Samperi

Ampertronics Pty. Ltd.

www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

You're saying that no one is interested in 5x7 dot matrix LEDs any more? That seems rather surprising.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

No: just pointing out that you're posting in a thread that has been inactive for nearly eight years;  so rather unlikely that the original contributors are still looking for suggestions - don't you think?

 

EDIT

 

*inactive

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I was thinking of the TIL305 the other day and thinking they were too expensive. Well, they're not super cheap either!

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Nowadays, I would have thought that one of the small OLED displays would be the way to go; eg,

 

Monochrome 128x32 I2C OLED graphic display

 

adafruit wrote:

Dimensions:

  • PCB: 20mm x 35mm (0.8" x 1.4")
  • Display area: 7mm x 25mm

 

https://www.adafruit.com/product...

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I don't see how it matters whether the people that were discussing this in the past still care or not. Other people that do care will find the thread the same way I did.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Depends on what one's requirements are. There's no one-size-fits-all solution.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

brouhaha wrote:
I don't see how it matters whether the people that were discussing this in the past still care or not. Other people that do care will find the thread the same way I did.

You're missing the point.

 

The point was just to make sure that you were actually aware that you were replying to a very old, long-dead thread. Many (especially new arrivals) don't realise this.

 

You could help by prefixing your post with something like, "I know this is an old discussion, but ..."

 

Depends on what one's requirements are. There's no one-size-fits-all solution.

Indeed.

 

And now the original requirements are lost in the mists of time.

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

awneil wrote:

No: just pointing out that you're posting in a thread that has been inactive for nearly eight years;  so rather unlikely that the original contributors are still looking for suggestions - don't you think?

 

EDIT

 

*inactive

 

Oh, I dunno about that.  JS is still active, and his account is old enough to get a driver's license.  laugh  S.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Bah! John's just an infant. From photos it's clear he's hardly begun to grow hair yet..

Happy 75th anniversary to one of the best movies ever made! Rick Blane [Bogart]: "Of all the gin joints, in all the towns, in all the world, she walks into mine."

 

"Some questions have no answers."[C Baird] "There comes a point where the spoon-feeding has to stop and the independent thinking has to start." [C Lawson] "There are always ways to disagree, without being disagreeable."[E Weddington] "Words represent concepts. Use the wrong words, communicate the wrong concept." [J Morin] "Persistence only goes so far if you set yourself up for failure." [Kartman]

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Jim was the one who actually expressed an interest - he seems to have hair to spare ...

 

cheeky

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

JohanEkdahl wrote:
Bah! John's just an infant. From photos it's clear he's hardly begun to grow hair yet..
Pot calling kettle black... cheeky

Ross McKenzie ValuSoft Melbourne Australia

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I'm of a certain age also...

 

But y'all need to remember that grass doesn't grow on a busy street.

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

There is almost no grass on my "highway". Is yours a wig Lee? cheeky

Ross McKenzie ValuSoft Melbourne Australia

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Might I suggest this line of conversation be moved to OT (Old Timer)...wink

David (aka frog_jr)

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

frog_jr wrote:
Might I suggest this line of conversation be moved to OT (Old Timer)...

I read along and saw the "move this thread" suggestion ... then saw the pun.  ;)

 

Why move it?  We are just teaching an old thread new tricks.

 

Wig, indeed.  Like I'd pay for hair.  Way too cheap.

You can put lipstick on a pig, but it is still a pig.

I've never met a pig I didn't like, as long as you have some salt and pepper.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

awneil wrote:

Nowadays, I would have thought that one of the small OLED displays would be the way to go; eg,

  • PCB: 20mm x 35mm (0.8" x 1.4")
  • Display area: 7mm x 25mm

 

Yes, this old thread does illustrate the effects of time, and how Volume Sweet spots, mean some products simply drop under MOQs...

 

Designers of long life products face this sort of issue, as time ticks along, and sometimes a product redesign is needed purely because some part has a 'go away' price...or has gone away itself..

 

A Small OLED looks like a 2017 solution, but will that be available in 2027 ?

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

A Small OLED looks like a 2017 solution

I've got a bunch of HCMS290x displays rescued from dumpsters.  Looks like they're only about $25. :-)

 

So ... clearly there should be some sort of OSSW for a small AVR or ARM chip that translates between the comm protocol used by these $20-$50 to the I2C protocols used by the $3 OLED displays, right?

(although I guess the real advantage of the expensive HP displays is more due to their form factor and physical robustness than anything elegant about the comm or display itself...  Sigh.)