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Digital RGB and DVI interface

Abhishek Tiwari61
Intellectual 335 points

Hi,

Please clarify me on the Difference between Digital RGB (RGB x 6 bit each +Hsync+Vsync+CLK+Enable) and DVI interface (24 bit bus) signals.

A chip with 24 bit DVI input can also be used for digital RGB x 6 bit each( 18 bpp)?

Thanks.

  • 0
    TI__Mastermind 43875 points

    You are mixing terminology a little here...

    DVI usually means the high speed serial digital interface, and is a 4 channel differential signal set. This was the precursor to what is now HDMI.

    What I think you are asking is the difference between 18 bit parallel and 24 bit parallel.

    The only difference between 18 bit and 24 bit (16 bit is also very common) is the number of bits assigned to each color channel, hence the dynamic range.

    Converting between 16, 18 and 24 bit formats depends on a) which direction you want to go and b) what quality sacrifice you want to make.

    If your source is 24 bit and your target is 18 bit then you can simply drop the 2 lsb for each channel.

    If your source is 18 bit and your target is 24 bit then there are a few options. You can tie the 2 lsb of each color to '0', you can tie to '1' or you can tie to the 2 corresponding color MSB. Each method has a slightly different resultant color curve.

    You can also introduce dithering for a higher quality but this requires more than simple wiring.

    Have a look at the following Wiki which has some information you might find useful.

    BR,

    Steve