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GreenGiant83
02-25-2007, 01:27 PM
I was thinking about a project that would involve mounting a color lcd display, something small in the area of 2" x 2" onto a piston that would drive the screen up and down at something like 30 times per second.· Do you think a project like this would be feasible?

sealion99
02-25-2007, 01:46 PM
That is a fairly odd request!· Generally, output devices are put somewhere where they can be used, and sitting on top of a moving piston does really qualify.· LCDs are fairly durable if mounted in a generally static location.· However, they really will not hold up very well if bouncing around constantly.· Wiring would be a fairly troublesome area too, since it would ultimately end up flopping all around (regardless of how well it is buttoned up to start).· I would not consider mounting any type of display in that type of area, it just does'nt seem to make much sense.· What exactly are you trying to do?· Why do you think·mounting it in that type of environment would·be good for your application?··What information do you plan on displaying on this display?· How would it·be used?· Why would you not try to mount it in a close location, where it could be read and effectively used?·

Chris

Loopy Byteloose
02-25-2007, 11:33 PM
The beauty of solidstate is that it generally doesn't wear out due to vibration or other such redundant motion.

The first car radios were vacumn tube and vibration played havoc with the filaments and plates inside the tubes. As you can see, car radios are doing fine these day.

In other words, if you securely mount the device and the wires going into it -- it would probably work fine. Our whole space program flourished on the transistion to solidstate and many of the devices are made for withstanding abuses that they will never encounter.

I would use a ribbon cable with extra slack and both ends quite secure.

Is this some kind of pop advertising? Or a game?

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GreenGiant83
02-26-2007, 02:15 AM
I'll admit it is a fairly odd request. The idea is that I will take a 3d model and break it down into cross sections. As the piston is traveling along its path it will display the cross section that lines up with the appropriate section of the "model" Using persistance of vision this would idealy render a 3D model, that could be animated. I am concerned that once I get the LCD screen pumping up down at that fast of a rate, something will happen to damage the LCD screen. I have seen projects like this before that involved an LED matrix.

PJ Allen
02-26-2007, 02:41 AM
I dunno, man.· You might try blinking an LCD segment at a "P-O-V" rate and take stock of that result.· LCDs are slow.· Other matters: the "L" in LCD is for "Liquid" and the "L" is encapsulated in Glass.· [Glass + Vibration (i.e. G-force/s) =· hand-wringing.]

Dennis Ferron
02-26-2007, 02:53 AM
Maybe an OLED display would be better. They're like LCD's but use tiny LEDs. Response time should be faster because they're LEDs, and they don't have and liquid inside them.

pjv
02-26-2007, 06:18 AM
Hi Dennis;

A while·back I had a go at the early release of OLED displays, and found them to be rather sensitive to "burn in". Leaving the display set to a static picture for a weekend caused a permanent shadow (reduction in brightness) on the activated cells on the screen.

I wonder if the newer color OLEDs exhibit this problem......

Cheers,

Peter (pjv)

GreenGiant83
02-26-2007, 01:06 PM
holy crab oled's are awesome!· I didn't know such displays existed.· Where can I find these things?· How much do they cost? How easy are they to interface with?

Dennis Ferron
02-26-2007, 01:37 PM
pjv: That's interesting that burn-in should be a problem, since I was just reading about a homemade pong watch somebody made using OLEDs. Burn-in would be a real problem on a watch face. The author of the watch project website didn't mention burn-in, but he did use only yellow/green OLEDs because they have a longer life than blue or red ones, or did at the time he started. I know the original OLEDs were fragile but that they've come a long way.

GreenGiant83: They're something like $30 -$70 at Sparkfun. (www.sparkfun.com) They have a serial interface and somebody has written a Propeller object for it that is available on the object exchange. If you try one out, let me know how it goes - I've been wanting to get one for ages now for a handheld Propeller "gameboy" project I made plans for, but other projects got in the way.

GreenGiant83
02-26-2007, 11:45 PM
I ordered one off spark fun last night.· I'll let you know how it goes.· I am hopeful, I have never played around with displays like this before.