sony 52inch 120hz

There are a few 120Hz techniques used by these tellys.
Some introduce a completely blank frame, others interpolate between 2 frames.

You would think that interpolating between 2 frames would be better but not necessarily so.
First the TV has to wait for the next frame before it can process the current frame, this introduces 1 frame lag.
Then it also has to do the processing which can add many more frames lag.

For now I prefer the blanking method for PC use but really want to have true 120Hz input.
fyi
 
Nenu said:
There are a few 120Hz techniques used by these tellys.
Some introduce a completely blank frame, others interpolate between 2 frames.

You would think that interpolating between 2 frames would be better but not necessarily so.
First the TV has to wait for the next frame before it can process the current frame, this introduces 1 frame lag.
Then it also has to do the processing which can add many more frames lag.

For now I prefer the blanking method for PC use but really want to have true 120Hz input.
fyi
Click to expand...

I thought it was either a duplicate frame or interpolation.. A blank frame would just add flicker?
 
Yeah the duplicate frame is another method, it escaped me when I was writing it.
The blank frame method seems to work quite well though (well better than expected :D)
I read a fair amount about it last year but it was a long time back so cant give a link.
 
NKDietrich said:
I thought it was either a duplicate frame or interpolation.. A blank frame would just add flicker?
Click to expand...

No; some TVs add a black frame in between. It does not cause flicker, because LCD pixels can not react that fast.

120 Hz in TVs serves a much different purpose then it did in computer CRTs. It is entended to reduce motion blur. TVs have no need fo 120Hz input signal, because video is recorded at less then or equal to 60Hz. Movies are recorded in a format known as 1080p24 or 180p at 24 frames per second. They become 60 Hz through a process known as 3 to 2 pull down, which reduces the quality of the video to some degree. Some of the new 120HZ LCD TV avoid this by using 5 to 5 pull down, which does not degrade the orignal signal. This works because 5 x 24 = 120. In the case of 3 to 2 pull down uneven multipals of frames are used to acheive 60 Hz.

Keep in mind that the pixels on a computer LCD have a slower response time then LCD TV do, so increasing the scanning frequency would not improve anything and it would require more band width. One of the advantages of Displayport is that it supports higher bandwidth, which can be used for higher frequencies and more color bits when LCD get their.

You can play games on a TV and watch Movies on a computer, but the display technology is very different.

Best of luck

Dave
 
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