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Is 1080p still 1080p no matter the display size? - Page 2

post #11 of 20
To answer your question, size does not impact the performance whatsoever... Only the amount of pixels being rendered by the gpu does. 1080p has ~207,000 pixels on a 20" monitor being rendered by the gpu, and 1080p has ~207,000 pixels on a 40" too.

Pixel size is something the tv deals with, not the gpu. If hes getting poor perfomance its software/driver related.
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post #12 of 20
lol... think of it as the graphics card has to fill all of the pixels. with two different sized displays at the same resolution, the gpu has to fill the same number of pixels, so the same amount of gpu horsepower is used in the filling of those pixels.

if any lag is observed it is due to something else entirely. (program used, display's input lag, etc)
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post #13 of 20
The bad performance is most likely due to different settings and inputs. I've had similar problems with xbmc sometimes lagging badly when I switch to my hdtv. Haven't quite pin pointed the issue but it has nothing to do with the size of the monitor. Your issue might be due to hardware acceleration failing when switching to another display.
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post #14 of 20
1080p is 1080p. To confirm, put a small (<32") 1080p display next to a large (>50") 1080p display and view from less than 5 feet away.

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

Allow me to maths it out:
Where res=1920x1080 (aka 1080p);
PPI=2202/(diagonal of screen)

eg. 24" 1080P 16:9 LCD
PPI=2202/24=91.75 pixels per inch (pretty tightly grouped)

eg. 60" 1080P 16:9 LCD
PPI=2202/60=36.7 pixels per inch (better stand back!)

Which gives way to Optimum HDTV Viewing Distance (chart)
Edited by viper522 - 11/8/11 at 1:18am
post #15 of 20
My best guess on why the TV is lagging is because, most, if not all modern TV's have some sort of DSP built-in.
Try to use "game mode" if your TV has that option, it will try to bypass the image processing that the TV tries to do.
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post #16 of 20
Quote:
Originally Posted by NateN34 View Post

Yes, they are both 1080p. Same amount of pixels, just bigger screen which equals worse picture quality..
And no, they are not monitors, those would be considered TV's at that size. The bigger TV's usually have a higher response time, hence the input lag.

Thought response time and input lag where two different things. Response times deals with ghosting, and lag has to do with how long it takes for the monitor to respond to say your mouse movement
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post #17 of 20
Quote:
Originally Posted by Hogwasher View Post

Thought response time and input lag where two different things. Response times deals with ghosting, and lag has to do with how long it takes for the monitor to respond to say your mouse movement

Correct.

1080p is the same amount of data PER FRAME. However it depends on how many frames the graphics card is trying to draw. If there is a mismatch in framerate, I'm not sure if the GPU handles the interpolating or the TV does, but if the GPU does the interpolating then it would make sense it lags more on the TV, because it is the wrong refresh rate.
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post #18 of 20
I'd take youtubes "HD" with a grain of salt. It's not real HD. It's compressed garbage at 1080 resolution.
    
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post #19 of 20
Quote:
Originally Posted by ComradeNF View Post

Someone on YouTube made a very interesting comment on one of my videos today. He was asking why a C-50 APU can output 1080p video to a 20-24 inch monitor with a steady 30 FPS, but on a 42-55" monitor the same 1080p video lags.

I have no idea how to explain this, and it doesn't make sense to me either. 1080p should still be 1920x1080 no matter the display size right? So how come the larger displays experience some lag with this certain APU, but smaller screens don't, with the exact same resolution?

Because that huge TV has a sloooooooooow response time but really its because of Interlace and Progressive.

Interlacing is a compromise trick developed for traditional CRT TVs early on to allow them to use the existing amount of information to display higher resolution images and also double their refresh rate from 30 to 60Hz to prevent noticeable flickering. It does this by alternately displaying all the odd-numbered horizontal lines in an image, then displaying the even ones, and back again.
post #20 of 20
There is no 23 or 24 fps hdtv. The NTSC standard is 29.97(30fps) or 59.94(60fps). Film is shot in 24fps. Before tv's used to have to use 3:2 pulldown to display 24fps. With the advent of 120hz, 24 fits into 120hz exactly 5 times, so no more 3:2 pulldown is needed. The HDTV is not really 120hz, it simply just interpolated two frames and creates a "fake" frame in between.

1080p is 1080p no matter what the size of the monitor. The lag you see is probably the result of the tv's processing "enhancements". Tv makers simply do funky things with the signal to make it look better. The tv's processor gets the signal, jacks with it then shoots out the adjusted signal. It creates a little lag. Usually this doesn't bother the normal tv viewer because we don't interact with the display in realtime to notice the lag. But if you ever noticed how much longer tvs take now to change the channel? This is partly the reason why. My oldschool 20 year old sony tv used to switch channels faster than my brand new hdtv. (also other factors like new digital signal acquisition, decoding) But i regress, If the tv was connected via hdmi then there's a good chance it went thru to enchancement. Connecting it via VGA would prob yield less lag, that or "game mode". Usually that bypasses the tv processing.

Is tv processing really there? If you've played any kinda guitar hero game or timing game, you've probably noticed a timing calibration setting. This delay the game so your keystrokes will match the game.
Edited by soymilk - 11/12/11 at 4:14pm
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