CMR vs Refresh Rate

[Dolby]

When I bought my LCD back in 2009, they simply mentioned 60 or 120hz panel - there was no fancy marketing on CMR.

If I'm in the market for a set now, how would I know what panel it actually is, as I know the Clear Motion is mere marketing?

EDIT : I found the larger TVs are actualkly 1200 CMR http://www.samsung.com/us/download/2013_LED_Comparison_Grid_v7.pdf

 

[Dolby]

Postman?

 

[Roman4604]

as I know the Clear Motion is mere marketing?

Not totally without any practical merit.

CMR is basically the approximation of higher perceivable frame rates by utilising various optical or digital tricks e.g. additional fake frame generation, back-light stobing etc. How perceivable this additional motion clarity this turns out to be, usually varies from person to person.

 

[Dolby]

But the largest difference and the one most visible would be panel refresh, which it seems is not easy to find?

 

[Roman4604]

But the largest difference and the one most visible would be panel refresh

Not that simple; if the refresh rate of the content being injected into the TV is not increasing then when what is the panel's increased refresh rate actually displaying?

 

[Dolby]

I have no idea of the technical side

But when I bought my initial LCD I was going for a 50/60.

He moved the 100/120hz LCD next to the 50hz (that was the only difference) and entered the same source into both. Although the difference wasn't always present, in certain scenes there was a huge difference - scrolling text in the credits or a sponsored (text) skimming across the water.

On the 50/60 I battled to read the text and the credits looked juddery - but the other set was smooth. As I say, not every scene - but when motion was involved the 100/12 def looked much better

 

[Roman4604]

I have no idea of the technical side

OK, if the how and why don't concern you, then here is some more general guidance;

As mentioned CMR is generated from a combination of image processing effects (or tricks). Frame interpolation (additional fake 'content' frame generation, historically market as 100/120Hz) is one of these, and as a rule of thumb, makes up 50% of the CMR rating. So a CMR200 rating will most likely equate to 100Hz refresh panel (not that refresh rate is an appropriate concept for LCD technology, which doesn't strictly require refresh).

 

[Maverick Jester]

I have no idea of the technical side

But when I bought my initial LCD I was going for a 50/60.

He moved the 100/120hz LCD next to the 50hz (that was the only difference) and entered the same source into both. Although the difference wasn't always present, in certain scenes there was a huge difference - scrolling text in the credits or a sponsored (text) skimming across the water.

On the 50/60 I battled to read the text and the credits looked juddery - but the other set was smooth. As I say, not every scene - but when motion was involved the 100/12 def looked much better

A 50Hz panel? Or was the source outputting the signal at 50Hz? It does make a huge difference in the image that you would see on the connected panels.

The 120Hz panel would look smoother in certain instances, due to the motion interpolation being done to insert the additional frames (as Roman has already mentioned). But again, this is largely dependent on the refresh rate of the source in question.

 

[Dolby]

I have no idea what the source was - but on the two panels (50 and 100) it looked far better on the 100

 

[Maverick Jester]

I have no idea what the source was - but on the two panels (50 and 100) it looked far better on the 100

Well, it would, subjective to a host of factors. A 100Hz panel is better than a 50Hz panel in any event.

But I think to answer your question- panels do have refresh rates of up to 120Hz. When you see figures above those, that would be something like the CMR value being marketed.

 

[5plus2equals9]

http://www.rtings.com/info/what-is-the-refresh-rate