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LCD STN Winstar WC320240A Help!

Discussion in 'Embedded' started by Fabio, Sep 15, 2005.

  1. Fabio

    Fabio Guest

    Hi,
    Is there somebody who uses this LCD: Winstar WC320240A ? I have some
    problems in visualization. I followed the indications on the datasheet
    about video timing but
    there are these problems:

    1. According to the datasheet the supply voltage it typically 25.8 V
    but when I use this voltage image becames totally white. Instead if I
    decrease voltage to 18-20 V I can see the correct image.

    2. Furthermore when I can see the correct image, a white horizontal
    line appears in the middle of the screen and another in the down of it.

    Can somebody help me? Thank you.
     
    Fabio, Sep 15, 2005
    #1
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  2. Hi Fabio,
    This sounds OK. Normally, tha datasheet states the maximum Vlcd
    Voltage. The warmer the device temperature gets, the lower the
    contrast voltage (Vlcd) has to be to maintain the same contrast level.
    You have a timing problem. Check dot/line/frame clock timings.

    HTH
    Wolfgang
     
    Wolfgang Mahringer, Sep 15, 2005
    #2
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