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LCD Contrast Voltage on 16x2 LCD

Discussion in 'Electronic Design' started by Joe.G, Mar 22, 2005.

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  1. Joe.G

    Joe.G Guest

    Hi All,

    Product - 20x4 Standard LCD using a similar HD44780 controller. The LCD is
    standard and not extended tempreature. and Vlcd is near typically 0v.
    (Vlcd is the contrast voltage pin)

    1. I am interested in the methods used to set Vlcd (the contrast voltage).
    Please comment .

    2. Does the Voltage acrross the LCD planes (commons) very in production?

    3. Can I use a single resistor to ground to adjust the Vlcd over the
    operating tempreature range to set the contrast.

    4. What other factors should I consider.

    What are your thought on these questions?

  2. John Fields

    John Fields Guest

  3. Tim Mitchell

    Tim Mitchell Guest

    I always do it with a 10K preset from +5V to GND, wiper to Vlcd. Preset
    is set on manufacture, works fine.

    If the equipment will be subject to extremes of temperature you will
    need to do some temperature compensation or the display will disappear
    in the cold and go black in the heat.
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