Two of the most confusing letters thrown around in reference to LCD and TVs these days are "H" and "z." The confusion will just continue to mount this year, as numerous manufacturers announced 240Hz displays at CES, doubling the 120Hz spec in an attempt to lure buyers. But is it twice as nice?
Until proven otherwise, I'm saying no, 240Hz is not worth waiting for.
Before I get into why, it's probably worth writing a few sentences to sketch out what all these numbers mean. Standard LCD and plasma TVs refresh the screen 60 times per second, or 60Hz, which is plenty fast enough to eliminate flicker and create the illusion of motion from a series of still images. In fact, most sources sent to your display arrive at the nominal rate of 30 frames per second, and each frame is repeated once by the television to achieve 60 total fps.
The problem is that with LCD, some viewers can perceive motion blur in fast-moving objects on standard 60Hz models (motion blur like this isn't an issue with plasma or other display types, whether 60Hz or otherwise, because they use different methods to create the illusion of motion). To reduce blurring, most 120Hz LCD displays use interpolation--called MEMC for "motion estimation-motion compensation"--to create a new frame between each of the original frames, so there's one interpolated frame for every true frame. An interpolated frame is composed of the processor's best guess as to what should be there, based on the contents of each of the true frames. … Read more