Originally Posted by ltgary
As I've stated in prior posts, I dont play games. I watch tv/movies and for those purposes I dont see a difference with the 240hz on or off so I leave it off. I've done alot of research and this feature was really developed for and is useful for sets with a normal flourescent backlight which is on all the time. LED's are a total different technology. They can individually be turned on and off and brightened and dimmed. IMO I dont think LED's really need the 120hz or 240hz but the manufacturers include them as a marketing gimmic.
You are confusing the benefits of local dimming with frame interpolation (or other motion improvement methods) and neither feature is a marketing gimmick!
Frame interpolation also has nothing to do with the backlight type - whether CCFL or LED - and you may either like it or not: Fact is that LCDs are hold-type-displays that have a worse motion performance than non-hold-type-displays (CRTs, plasmas). The result is that the picture is less sharp, less clear when motion is involved. The reason is the effect of hold-type-displays on the human eye - use the search function and do some more research as there has been written a lot about it.
There are several methods to improve motion handling on LCDs and they have certain advantages (smoother, more detailed motions) and disadvantages (artifacts and/or the so-called "soap effect").
However, some LCDs with local dimming LED backlight employ a method called "backlight scanning" which pulses the screen very rapidly and increases the motion resolution for the whole screen, which results in increased sharpness.
I don't know if your LG supports such a mode but you should get yourself some good demo material with looping horizontal or vertical pans and then run some tests with the different settings.
Try to notice the sharpness of moving objects, especially smaller ones. You may be surprised by the results!
Adjust the set to what looks best for either you or your moms eyes and viewing habits and forget all the suggestions from others including me. You're what counts. If it looks good to you and you are satisfied who cares what I or others think of the set and its adjustments? Just dont leave it in the Vivid setting.
Of course the owner should have the last word on everything, but IMHO it's better to make an informed decision than simply making a decision.
This is the same thing like asking in the forum before you buy a TV (for disadvantages or capabilities) or just running into the next shop.