Help with Laptop/HDTV/HDMI Connection

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dougierydal

327 posts

Ultimate Geek

#67439 1-Sep-2010 20:56

Hi - we were burgled recently which was a complete pain in the arse, other than we got 2 new laptops out of it (oh and an alarm system!).

One of ones stolen was a Dell from about 2004/5, and it was replaced by a lead- in Compaq worth about $900, and the other was a Dell from 2008 and it was replaced by a Dell Inspirion 15r i3.

My question is (and excuse me if it is a thick one), when i hook the Compaq up to the Panasonic Plasma 42inch Full HDTV, the initial display in the top left says 1080p/60Hz, but when i hook the Dell up it says 1080p/24Hz, both are connected using the same HDMI cable.

What is the difference and why the difference?

Thanks

richms

28168 posts

Uber Geek

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Lifetime subscriber

#375514 1-Sep-2010 21:57

the difference is 36Hz

It is because of the refresh rate you have chosen in display properties. 24Hz is only really any good for watching deinterlaced film stuff like blu ray and downloaded dvd rip divx's, and possibly dvd content that your display card can deinterlace.

Richard rich.ms

dougierydal

327 posts

Ultimate Geek

#375900 2-Sep-2010 17:46

Ha thanks. yep i can subtract 24 from 60...

I can't seem to find a control panel anyway to change it, I guess an AVI file (downloaded movie) is going to be better at 60hz thann 24hz?

richms

28168 posts

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#376065 3-Sep-2010 03:38

Its in the display properties, same place you change refresh rate on a normal monitor worked everytime I tried it on a TV.

depends on the source, look at the AVI framerate - if its 24 then setting it to 24 can let the tv work its 100Hz voodoo magic on the picture better than having the PC try to change it to 60 and then have the tv work from that.

If its a video sourced thing that has been deinterlaced when encoded and has a 30FPS rate, then it will look real bad on 24Hz, 60 is the way to go.

For the odd NZ TV rip you may download in PAL at 25Hz, then you want 50Hz to stop it having nasty judder.

Would be so nice if a PC would change on playback like almost every hardware player out there, but they dont.

Richard rich.ms

Masterpiece

247 posts

Master Geek

#376361 3-Sep-2010 19:16

Was going to write a response about this, far easier to post a couple of links which discribe the differences and what they mean.

http://en.wikipedia.org/wiki/Moving_image_formats

http://en.wikipedia.org/wiki/Frame_rate#Frame_rates_in_film_and_television

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