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Display technology? (old laptop)

Discussion in 'Electronic Design' started by [email protected], Feb 26, 2008.

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  1. Guest

  2. Ecnerwal

    Ecnerwal Guest

    They were marketed as plasma, as best I recall (way out of my reach at
    the time, but I did see a few). An array of tiny neon bulbs,
    conceptually, or something close to that.
     
  3. Guest

    I think that's right. I had an IBM PS/2 Model 70 Portable (25 MHz 486,
    Must been this one (IBM PS/2 Model 8573-P70 8573-121):
    http://www.tpuser.idv.tw/phpBB2/viewtopic.php?t=27636

    Seems someone figured out how to controll them aswell:
    http://ps-2.kev009.com:8081/ohlandl/8573/8573-P70.html

    Guess an FPGA and 5V level translation should enable one run the screen without
    the computer :)

    I've seen some greyscale displays from this era aswell. Any idea how they work?
    http://www.tulipgv.nl/tlt-nb.html
     
  4. Phil Hobbs

    Phil Hobbs Guest

    Now that I think about it, I think it was a Model P75--same thing but
    with a 486DX. It looked exactly like the one in the pictures...weighed
    probably 25 pounds. Running DOS and DesqView (a full-screen DOS task
    switcher that I just loved), it was great stuff for 1990.

    Cheers,

    Phil Hobbs
     
  5. Arie

    Arie Guest

    Those are all LCD screens.

    The Plasma screens were limited to about 16 intensity levels, mainly
    because the dot could not be completely extinquished. The display was
    self-scanning, at one end of a row a dot was created, then transported using
    much like the charge in a modern CCD. By modulating the current the light
    output was controlled.

    I designed some medical equipment in those days using Burroughs "self-scan"
    plasma displays, they needed AFAIR a hefty 200V dc at almost 100W if fully
    lit. A 4-phase clock transported the dot.
    For the principle see http://pdplab.incheon.ac.kr/images/selfscan_TM.gif


    Arie de Muynck
     
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