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Thread: Powering LCD panel with batteries

  1. #1
    Newbie
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    Aug 1999
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    Wigan, UK
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    Powering LCD panel with batteries

    Hi all,

    After frying my LCD when one of the wires popped out and shorted the panel, I started thinking of powering the panel with batteries. The following is from Practical Electronics instructional feature "How To Use Intelligent LCDs" found at http://www.epemag.wimborne.co.uk/resources.htm the link to the articles is about half way down the page.

    "Although the LCD module data sheets specify a 5v dc supply (at only a few milliamps), supplies of 6v and 4.5v both work well, and even 3v is sufficient for some modules. Consequently, these modules can be effectively and economically powered by batteries."

    I was thinking of using 3 (or maybe 4) AA or AAA cells (1.5v each) in a holder attached inside the casing I am building for my LCD panel. This would be good for a few reasons :

    1. No wires carrying +5v running around the car from the PC to the panel.
    2. Convenient - just change the batteries when they run out.
    3. Less chance of any wires coming loose and shorting out the panel.
    4. Less power consumption in general.

    Has anyone else tried this ? I am wondering in particular how long the batteries would last in this setup - quite some time I would've thought given the low current drain.


  2. #2
    Newbie
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    Somebody out there must have at least an opinion on this.

    Come on you lot !

  3. #3
    Variable Bitrate
    Join Date
    Jul 1999
    Location
    Greensboro NC
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    Im not saying its not something to look into but to me I think changing the batteries would be a hasshle and as for wires popping off, (I dont know what happened in your case) but couldnt the power wires just as easily pop off? And as for power consumption LCD's are very low current so why seperate them from whatever your using to power the PC?

    Just a few observations.

  4. #4
    Low Bitrate
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    Jul 1999
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    Brisbane, Australia
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    Man, you still have to run a serial cable to the LCD.. just wrap a 12V line around it and solder it in good.. batteries would suck big time..

  5. #5
    Low Bitrate
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    Sep 1999
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    Australia
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    I have to agree with inmytree, changing batteries doesn't realy sound convenient, its just more **** you would have to find a place for. However LCD's in general don't use much current so your battery would probably last years.

  6. #6
    Variable Bitrate
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    Aug 1999
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    Yorba Linda, CA
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    Even if you use batteries, there is still a chance of a "wire coming loose and shorting out the LCD". A fresh set of AA batteries can kill an LCD just as easily as a car battery can (sure, it may not be as violent, but the LCD can still be rendered useless!) if a wire comes loose and touches a pin it shouldn't.

    My solution: Do a good soldering job and don't be afraid to use as much electrical tape or heat-shrink tubing as you like to keep wires from coming loose or crossing.

    If you're using the parallel port to drive your LCD, you can send power up the same cable -- no need to run separate wires. Some parallel ports can even power an LCD (no backlight), but you need to be careful because parallel ports can't source much current.

    Batteries would be more of a hassle in my opinion than wiring the LCD to the computer for power.

    --Jason
    http://jump.to/m2pc
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

  7. #7
    Newbie
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    I've now tried powering the LCD panel with batteries, but I can't get Winamp displays an error saying it can't recognise the panel. I don't think the batteries can supply enough juice, as when I use the trusty +5v/-5v from the PC, the panel works fine.

    So, for anyone else thinking of trying this, good luck ! (and let me know if you have any success).

    Looks like it's back to using the PC as the power supply (with some careful sodlering of course !).


  8. #8
    Variable Bitrate
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    Aug 1999
    Location
    Yorba Linda, CA
    Posts
    323
    Did you connect a common ground between the LCD and the computer? This is needed before the computer can "Talk" to the LCD.

    --Jason
    http://jump.to/m2pc
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

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