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LCDs Normally White vs Normally Black

Discussion in 'Datasheets, Manuals and Component Identification' started by hawktron01, Apr 5, 2014.

  1. hawktron01

    hawktron01

    1
    0
    Apr 5, 2014
    TFTs have two modes, Normally white and Normally black.

    the attached data sheet is a normally black.

    focuslcds.com/wp-content/uploads/2012/10/FDS640x480127x98.43CGE_5.7.pdf

    What does that mean? what is the difference? What are the advantages?

    thank you
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,192
    2,694
    Jan 21, 2010
    Do you really need that answered?

    First you tell us the difference, then you ask us what it is!?!?!?

    mostly aesthetics.

    edit: You need to look at how a TFT display works (actually any LCD display is fine) and consider the relationship between the direction of polarization for the filter controlling the light entering the display and that of the one controlling the light exiting the display.
     
    Last edited: Apr 6, 2014
  3. kpatz

    kpatz

    247
    52
    Feb 24, 2014
    For many LCD displays if you remove the polarizing filter from the front of the display, flip it over and reinstall it, it'll change from normally white to normally black and vice versa.
     
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