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24Hz, 50Hz and 60Hz source

svanur08

Novice Member
Was wondering how does this work on LCD/LED tvs? If the TV has refresh rate 60Hz and plays 24p content like blu-rays, it does 3:2 pulldown, and 5:5 pulldown if it´s 120Hz without judder as i understand it.

What about 50Hz source, does refresh rate change on the tv to 50Hz refresh rate on 60Hz tv, and to 100Hz on 120Hz and 2:2 pulldown, Or some other pulldown from 60Hz to 50Hz?
 

AndyRg4

Active Member
Was wondering how does this work on LCD/LED tvs? If the TV has refresh rate 60Hz and plays 24p content like blu-rays, it does 3:2 pulldown, and 5:5 pulldown if it´s 120Hz without judder as i understand it.

What about 50Hz source, does refresh rate change on the tv to 50Hz refresh rate on 60Hz tv, and to 100Hz on 120Hz and 2:2 pulldown, Or some other pulldown from 60Hz to 50Hz?
Most UK TV's will be able to natively display all of these refresh rates without any pull down
 

svanur08

Novice Member
I have a Samsung UE50KU6000 tv with native 60Hz refresh rate, so are you saying it changes refresh rates between sources like 60Hz, 50Hz and 48Hz for 24p?
 

mike7

Well-known Member
I have a Samsung UE50KU6000 tv with native 60Hz refresh rate, so are you saying it changes refresh rates between sources like 60Hz, 50Hz and 48Hz for 24p?
Yes, it must do to function. I would suspect using pull-down techniques.
 

Trollslayer

Distinguished Member
Display panels can run at different rates.
Some can do 50 and 60Hz, some 24, 50 and 60Hz etc.
 

Trollslayer

Distinguished Member
No.
 

AndyRg4

Active Member
I suspect it´s 50Hz and 60Hz switches between them and 3:2 pulldown for 24p content. :/
24 frames are displayed natively at 24 frames on most TVs. The pull down method is only needed when playing say 24 frames content on a TV that doesn't natively support it
 

dannnielll

Well-known Member
The old analogue TVs with the CRT displays were very inflexible with regard to changing frame rates. This is because the circuitry used to generate the raster.. the spot moving over the screen was linked to power supplies for efficiency. With digital screens, it's a much simpler process. There is a block of memory assigned to the screen and it basically does not matter within reason how often it is refreshed.
 

grahamlthompson

Distinguished Member
Was wondering how does this work on LCD/LED tvs? If the TV has refresh rate 60Hz and plays 24p content like blu-rays, it does 3:2 pulldown, and 5:5 pulldown if it´s 120Hz without judder as i understand it.

What about 50Hz source, does refresh rate change on the tv to 50Hz refresh rate on 60Hz tv, and to 100Hz on 120Hz and 2:2 pulldown, Or some other pulldown from 60Hz to 50Hz?
Any TV described as 1080P HD Ready will natively display correctly without pulldown provided the source is capable. eg When connected to a blu-ray player you get 1080p24. Many UK set top boxes and media players however will only work at 50Hz even when the source file is 24p or 60p.

HD ready - Wikipedia
 
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