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Help finding 8 bit to 6 bit RGB converter

Discussion in 'Misc Electronics' started by [email protected], Jul 1, 2007.

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  1. Guest

    I asked this question on an electronics forum and it was suggested
    that I ask it here. Anyways, here's my problem:

    I'm trying to make an LCD controller for a 18 bit LCD panel that will
    take a DVI or VGA input (yes, I know I am insane). I've found an
    appropriate 18 bit FPD-Link LVDS transmitter but the only DVI
    converter chips I can find output 8 bit per channel RGB (24 bit
    color). So what I need is either a chip that can convert the 8 bit
    color the DVI converter outputs to the 6 bit color the LVDS
    transmitter needs OR a different LVDS transmitter that does the
    conversion internally. I have found LVDS chips that can to the 8 to 6
    bit conversion internally, but have low resolution limits like 800x600
    -- I need them to be able to do 1400x1050 (SXGA+) or 1600x1200 (UXGA).

    This is driving me a little bit nuts because I know there has to be an
    easy way to do this, there are literally millions of 18 bit LCD
    monitors that take DVI and/or VGA inputs. If anybody could give me a
    clue on how to do this, whether it's finding a part I didn't know
    existed or telling me I'm going about this all wrong, I would be
    extremely grateful.

    I have considered what it would take to build something that would do
    this conversion myself, and I think it's a bigger project than I'm
    willing to tackle, especially since I know there has to be an easier

    BTW if anybody is unclear on this, I can't just use the most
    significant bits and forget about the other two, the way 24 bit color
    is converted for 18 bit LCDs is by using dithering to create a color
    depth that resembles 24 bit color (or at any rate looks a lot better
    than just using straight 18 bit color).

    I know this is a pretty esoteric area of electronics, but hopefully
    somebody out there will be able to help me out with this one.

    Thanks in advance
    --Michael Tripp
  2. You may just drop the two least significant bits to convert 8bits to 6bits.

    - Udo
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