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I have worked once with a chip from chips & technologies which was exactly for this job. The problem is that these things tend to change rapidly since they are following the PC market and, most available chips today are for the PCI interface.
Of course the drivers and everything else needed, even schematics are given from the companies.
Companies like this are EPSON, CHIP's & tech. etc. just make a search on google.
The unfortunate negative thing is that display chips are difficult to find in small quantities.
Triple adc's you can find from TI and AD, which are exactly for the job that you describe.
Some interface circuit will be needed of course but its simple logic.
The only problem there is the clock speed which is quite high.