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LCD screen power circuitry

Discussion in 'General Electronics Discussion' started by Kantas, Aug 14, 2011.

  1. Kantas

    Kantas

    1
    0
    Aug 14, 2011
    Hi all,

    I'm fairly new to electronics, just finished my first year at the local college for Electronics and computer engineering Technology.

    i happened to "win" an LCD screen, the upside, i get to play with an LCD screen yay!! the downside is i had to reverse engineer the whole thing.... cause i couldn't find any documentation on the screen. so now that i've successfully figured out how to turn it on, and work with it, etc. i need to start getting a power circuit designed for it.

    the LCD screen is the Sanyo DG0648, 64 x 480 resolution. good luck at finding datasheets etc. if you choose to look for them, at best you'll find the driver IC's Datasheets. but the pinout for the connection was a royal PITA.

    so, i've got the Screen to turn on, right now the PSU i'm using is an old enermax computer PSU, i need to use it's +5V line to power both the LCD logic, and the PIC MICRO 18F4685 microcontroller that i'm going to use to control this LCD. and i'm using the -12V line to power the LCD, because according to the Driver IC's on the LCD they require a voltage differential of 8 - 20 V all told. so in order to power the LCD i need a +5V line for logic, and anywhere from a -3V to -15V supply for the LCD power.

    so, i'm sure most of you can appreciate that lugging around an old computer PSU would be a bit bulky for a small LCD screen. so i'm curious if i can use a 12V supply from a transformer, and turn that 12V into +5 and -5 V supplies?

    i figure it "should" be easy enough, using a +5V regulator, and a -5V regulator IC... but i'm a little stumped as to how they would be wired in the circuit to provide me the power i require...

    any assistance would be much appreciated, and if you have any other questions feel free, i 'should' be online for a while.... i'll probably be browsing this forum for a while cause electronics are kind of interesting :D

    Kantas
     
  2. lalalandrus

    lalalandrus

    1
    0
    Feb 4, 2013
    Were you able to get the screen working?
     
  3. Raven Luni

    Raven Luni

    798
    7
    Oct 15, 2011
    The high voltage is typically for the backlight only which will usually consist of a bunch of LEDs in series. The biggest worry is making that voltage available and limiting the current - especially if its one of those paper thin connectors
     
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