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'[EE]: Large 7-seg displays'
2002\02\14@181039 by Edson Brusque

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Hello,

   a client asked me to make a device with some big LED-7-Seg displays. I
think the digit height is about 4 inches. How much current have I suply
continuos in each segment? What voltages? And if I'm multiplexing (PWM) at
25% (duty)?

   I know it's on the datasheets, but I can't find it clear on the
datasheets. I just want the general figures or points to where can I find
the correct infos.

   Thank you very much,

   Brusque

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Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
Blumenau  -  SC  -  Brazil
http://www.citronics.com.br
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2002\02\14@184419 by Tal Bejerano - AMC

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Brusque

Try at : www.velleman.be/productlist2.asp?lan=1&id=342518
they have there large digit display


Tal
{Original Message removed}

2002\02\14@193522 by Spehro Pefhany

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At 09:09 PM 2/14/02 -0300, you wrote:

>     I know it's on the datasheets, but I can't find it clear on the
>datasheets. I just want the general figures or points to where can I find
>the correct infos.

Usually digits that big have a number of LEDs in series for each segment.
You really have to look to the data sheets for the correct information such
as segment forward voltage (typical and max/min). It will vary with
manufacturer, (the number of LED dies may vary), color, and LED material.

For current, if you want 15mA average current, run the LEDs at 60mA and 25%
duty cycle. If you want some other current...

Look for forward current maximum, Vf(typ), Vf(max), Vf(min) and maximum peak
current (though the latter won't come into play at 25% duty cycle).

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
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2002\02\15@023209 by Vasile Surducan

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Edson, what I know with large displays from my experience:
- do not multiplex them if working in direct sun ( even there are
superbright, because of small visibility angle the result will be pour )
-any segment support up to 35...40mA and the voltage depend by the led
numbers inside the segment
-if you plan an indoor product then you may multiplex and increase
the current up to 50% than continuous mode and choose a correct duty cycle
( the medium power on any segment must be keept under maximum ratings )
And just a remark: 4 inch = 10cm is a small display, I've built using 10mm
leds, displays up to 60cm.

regards, Vasile

On Thu, 14 Feb 2002, Edson Brusque wrote:

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2002\02\17@164246 by Edson Brusque

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Hello Tal, Spehro and Vasile,

   Actually I think that building a 7 seg display with discrete 5mm LEDs
would be the better option for this project. Maybe even 5x7 displays with
5mm LEDs wich I think would be cool, but I will have to wait for the client
to tell me what HE wants.

   Thank you for your replies and if I get this project aproved I'll keep
you informed.

   Best regards,

   Brusque

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2002\02\18@055203 by mike

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I didn't catch the beginning of this thread, but If 'size matters',
Forge Europa (stocked by Farnell) do 8 inch (200mm) high displays

On Sun, 17 Feb 2002 18:40:11 -0300, you wrote:

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