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« on: August 05, 2009, 03:37:07 pm » |
How do I power and work this led screen?  |
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My name is Bob, and I'm an addict.
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« Reply #1 on: August 05, 2009, 03:39:56 pm » |
Lol,
I'm afraid it's going to take a bit more than just that..
We'd need a *clear* picture of the bottom, or if you can check to see which chip drives the LCD (if any)...
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« Reply #2 on: August 05, 2009, 03:46:23 pm » |
The bottom is just silver and then the pins coming out the side. No chip or anything.
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I don't think you connected the grounds, Dave.
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« Reply #3 on: August 05, 2009, 03:51:46 pm » |
Looks more like and LCD than an LED to me, but it is kinda blurry.
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Pete, it's a fool looks for logic in the chambers of the human heart.
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Manchester (England England)
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Solder is electric glue
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« Reply #4 on: August 05, 2009, 04:17:40 pm » |
So any history? Clairvoyant component identification is not a well practiced art form.
In short it looks like one of several tens of LCD displays.
Try rubbing it with a soft cloth, do you see outlines of seven segment characters? That could narrow it down.
However, I suspect it is a raw LCD display and will need a driver so it's not going to be easy to interface to.
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« Reply #5 on: August 05, 2009, 04:20:42 pm » |
Ok, so it is a LCD display. Good thing I only paid 75cents for it.
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ca
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« Reply #6 on: August 05, 2009, 04:51:01 pm » |
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« Last Edit: August 05, 2009, 05:10:33 pm by sync »
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« Reply #7 on: August 05, 2009, 05:21:28 pm » |
I think the light changed in here because I can faintly see outlines of numbers and then a V, the ohms sign, and an A. So I'm guessing it's from an old school multimeter.
The pins are the same design as those Lumex displays. So I'm guessing one of the pins is a ground and the others control which part is illuminated?
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Manchester (England England)
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« Reply #8 on: August 06, 2009, 07:57:51 am » |
and the others control which part is illuminated? No LCD displays do not light up. They in effect block the light, that's why they are dark. It is not just a matter of feeding a voltage to the segment you want to highlight you have to apply several rather complex waveforms who's phase changes according to what you want to illuminate. that is why it is best using a display driver chip. For an overview see:- http://en.wikipedia.org/wiki/LCDOr for a driver look up the data sheet for a HCF4055 |
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« Last Edit: August 06, 2009, 08:08:24 am by Grumpy_Mike »
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I don't think you connected the grounds, Dave.
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« Reply #9 on: August 06, 2009, 07:59:58 am » |
No LCD displays do not light up. .... according to what you want to illuminate Hah! Gotcha! [smiley=laugh.gif] |
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Pete, it's a fool looks for logic in the chambers of the human heart.
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Manchester (England England)
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« Reply #10 on: August 06, 2009, 08:10:24 am » |
GONG (as they used to say on the yes / no interlude) I got it right on the first sentence then slipped up on the second. You win the coconut  However, I could say you illuminate what you don't want to show but that would be cheating as I didn't think of it at the time. |
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« Last Edit: August 06, 2009, 08:12:00 am by Grumpy_Mike »
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