Originally Posted by MrZ123
Where can I find out this information?
Well in the three digital TVs (all Panasonic) I've owned there is a table towards the end of the manual which indicates what resolutions are handled for the different input options.
I took a quick look at the Sharp site and only found the manual for the LC-65D90U and it didn't seem to list the resolutions for each input. If you don't find it in the manual to your panel I guess you could send a question directly to Sharp via their web site.
The other option, which is what I do, is to use an outboard video processor. That way you don't have to worry about it as you can configure the VP to output the exact resolution to your TV that it requires.