Originally Posted by lyris
No, they don't. Most can't.
They can all ACCEPT a 4:4:4 signal, but most will downgrade it to 4:2:2.
Yes, unless you have a quality TV with an option (like naming the input "PC") most will downgrade it to 4:2:2 which is the format for cable/satellite broadcast.
HOWEVER.... if you manage to send your display a "PC" signal (noted as 1360x768 instead of 1080p/i), then your display should be smart enough to stay away from conversion.
a good example is if you have an Xbox 360 connected by HDMI to a crappy budget TV (dont worry. this can work for your "quality" brand like LG, Samsung, Sony, Sharp, etc.) like Insignia, Dynex, Emerson, Element, etc., you go to pick your HDTV resolution in the Xbox 360's system settings and you see your 480p-1080p options, but UNDER that might be a couple of "PC" resolutions.
If you choose one of those (even though it might not be your NATIVE resolution) it SHOULD put your HDTV into PC mode with 4:4:4.
Now the disadvantage to this is that putting your HDTV into PC mode is like game mode in that it disables your enhancements for less input lag, but unless you can get into PC mode at your TV's native resolution, you're still going to have more input lag than necessary because you aren't using your native resolution anymore even though its a PC resolution, which causes the TV to upscale with its crappy chip.
Usually the TV's that are 1080p have an option to change to PC mode when you are at its native resolution. It's just the TV's that are lower than 1080p usually don't come with the option and when using an Xbox, you better hope that it can support that specific PC resolution.
In summary, ALL HDTV's can do 4:4:4, but since you bought a budget brand TV, those features that allow you to go into PC mode on an HDMI/Digital connection (rather than using VGA) are locked to higher priced TV's and all it comes down to is MARKETING... (yippee).
So the panel is capable, but the TV manufacturer locks the firmware from doing such actions. which sucks, but that's what you pay for right?