Overclock.net banner

Strange TV resolution issue...

6K views 31 replies 8 participants last post by  ET900 
#1 ·
I have a tv that apparently does 1080i. When I set the desktop to 1920x1080i I am limited to a 30hz refresh rate. The screen also flickers because of this low refresh rate I'm assuming. I did a test of a custom res which was the same but I used 59hz, but the screen still flickered and also looked mildly corrupted. So I guess the verdict is that this screen can't do this res above 30hz successfully right? Seeing as it recommends I set the desktop to 1280x720 @ 60hz I'm thinkin that's it.

Well the thing that's odd about it is that I run games on it at 1920x1080 @ 60hz. I do get a bit of ghosting in games (but I think this happens at 1280x720 also and is probably more to do with the response time of the screen right?). The games seem to be fine like this though. Also I wasn't able to select that custom res with 60hz on the desktop (I was only able to test it). It's really forcing it to stay at 30hz. But for some reason games are an exception.

Can anyone help me figure out what's going on here? Thanks.
 
#4 ·
1080i TVs aren't natively 1080i. They are 720p.

It's "downscaling" (in actuality just converting, since 1080i is really more like 960x540 per frame) the 1080i signal to 720p.
 
#5 ·
Quote:
Originally Posted by Cheezman View Post

1080i TVs aren't natively 1080i. They are 720p.
It's "downscaling" (in actuality just converting, since 1080i is really more like 960x540 per frame) the 1080i signal to 720p.
sorry man i don't quite understand :/ there is definitely more detail in games when i am running it at 1920x1080. i have tested it thoroughly. i think i'm mainly confused about why the desktop can only run 30hz at this res where as games are fine at 60hz. maybe that's what you tried to explain to me but i didn't get it sorry...
 
#6 ·
Maybe it has something to do with your TV's refresh rate. Some TV's are 50hz and if you put 720p TV into 1080i mode it might sound logical. My TV is also fine, but when it goes into 1080i, screen start's shaking, but I cant see anything like that while playing move or anything.
 
#7 ·
Quote:
Originally Posted by Layo View Post

Maybe it has something to do with your TV's refresh rate. Some TV's are 50hz and if you put 720p TV into 1080i mode it might sound logical. My TV is also fine, but when it goes into 1080i, screen start's shaking, but I cant see anything like that while playing move or anything.
sounds like the same situation as mine. mine will do 720p @60hz always. it's just when i run 1920x1080i it runs at 30hz and the screen flickers. but somehow games seem to run at 60hz with that res without the screen flickering.
 
#9 ·
1080i is interlaced. i.e. Half the screen is loaded at a time, that means that on a 60Hz panel the maximum true refresh rate is 30Hz. Your screen can't actually go above 30Hz. If you want to be able to game or anything at 1080 resolution you will need a 1080p screen. It's likely that the issue becomes less apparent during games but it would still be there.
 
#11 ·
Amd 1920 x1080i30 or 29hertz is 59 or 60 "remember its I so only half get refreshed.try 29 .if yor at 30 (default lot of time everything act up.at 29 your below the electricity refresh of 60.most likely your issue is wcs default setting.change percepetual to restricted or similar name (sorry I am on the road.restricted will use same color squeem without any conversion (which is what cause lag (maybe in w8 ms accelerate this .till then restricted color is best .dont use absolute color .it is a resource hog .its intended for high end system
 
#12 ·
Quote:
Originally Posted by Layo View Post

Yea
frown.gif

Is your desktop "larger" then the TV too? I can't see like half of icon on ides and around 70% of taskbar. Didn't really play with resolutions or anything yet.
That's just how most TV's are designed. It's from back in the days pf CRTs and video tapes, where the frame didn't fill the entire resolution; there were just black bars around the edges. To compensate for this TVs were built with the extend of the screen extending behind the bezel. This tradition has, thanks to old habits, so that the outside 40 pixels or so are not actually visible on most TV sets. I believe this is, however, mostly software these days and there may or may not be an option to turn it on or off.
 
#13 ·
Quote:
Originally Posted by DirektEffekt View Post

1080i is interlaced. i.e. Half the screen is loaded at a time, that means that on a 60Hz panel the maximum true refresh rate is 30Hz. Your screen can't actually go above 30Hz. If you want to be able to game or anything at 1080 resolution you will need a 1080p screen. It's likely that the issue becomes less apparent during games but it would still be there.
Yeh I knew it meant interlaced, just wasn't sure what interlaced even meant haha... That's strange though, because when I play games with vsync the framerate is locking at 60fps and it clearly is running at 60fps! I can tell the difference between 30fps and 60fps easy!! :/
Quote:
Originally Posted by Layo View Post

Yea
frown.gif

Is your desktop "larger" then the TV too? I can't see like half of icon on ides and around 70% of taskbar. Didn't really play with resolutions or anything yet.
Yeh it does go off the screen a bit. Does the same at 1280x720p also. I think the pixels are there but just hidden behind the plastic. Not completely sure...

Quote:
Originally Posted by drbaltazar View Post

Amd 1920 x1080i30 or 29hertz is 59 or 60 "remember its I so only half get refreshed.try 29 .if yor at 30 (default lot of time everything act up.at 29 your below the electricity refresh of 60.most likely your issue is wcs default setting.change percepetual to restricted or similar name (sorry I am on the road.restricted will use same color squeem without any conversion (which is what cause lag (maybe in w8 ms accelerate this .till then restricted color is best .dont use absolute color .it is a resource hog .its intended for high end system
I get ya. I tried going below 30hz it but it didn't make any difference. Thanks for the suggestion though
smile.gif


Quote:
Originally Posted by DirektEffekt View Post

That's just how most TV's are designed. It's from back in the days pf CRTs and video tapes, where the frame didn't fill the entire resolution; there were just black bars around the edges. To compensate for this TVs were built with the extend of the screen extending behind the bezel. This tradition has, thanks to old habits, so that the outside 40 pixels or so are not actually visible on most TV sets. I believe this is, however, mostly software these days and there may or may not be an option to turn it on or off.
If I want everything to fit on the screen I have to use a custom res which is a little below 1080 or 720. Unless you're saying there should be another way?
 
#14 ·
Quote:
Originally Posted by ET900 View Post

It's an Orion TV. Is there any specific info you want? Thanks.
K, if u used ATI, how about go to CCC catalyst control center, then my digital flat panels, then scaling option. See if u can adjust there. Also make sure u have resolution set same as ur tv.. and try it. if no good, then try next smaller resolution and go to scaling option again..
Oh one more thing. i remembered when i first bought my TV from Future Shop, I hook it up and it was 1080p, after i did all that above, it was still not fixed... and a friend told me how about tv setting.... i was oh yea.. lol. So check ur tv if u have overscaling option enabled or off too.
wink.gif

Hope it helps.
Regard,
Lionheart1980:thumb:
 
#15 ·
Quote:
Originally Posted by Lionheart1980 View Post

K, if u used ATI, how about go to CCC catalyst control center, then my digital flat panels, then scaling option. See if u can adjust there. Also make sure u have resolution set same as ur tv.. and try it. if no good, then try next smaller resolution and go to scaling option again..
Oh one more thing. i remembered when i first bought my TV from Future Shop, I hook it up and it was 1080p, after i did all that above, it was still not fixed... and a friend told me how about tv setting.... i was oh yea.. lol. So check ur tv if u have overscaling option enabled or off too.
wink.gif

Hope it helps.
Regard,
Lionheart1980:thumb:
Well I'm using Nvidia but I know amd stuff well as I've pretty much always had ati cards until this 670, so I can relate what you're saying to the nvidia options. I am using 1920x1080i as I said... Every res I choose above 1280x720 will force 30hz. Only 1280x720 and below can use 60hz on the desktop, apparently... I did think to check the tv but there's nothing I can do there. It's pretty basic! :/

Also I'm not sure if anyone misunderstood but the flickering I experience isn't all that severe. It's still usable but pretty annoying on the eyes. I mean, I feel pretty certain I can't successfully run the desktop above 30hz if I want to use a res above 1280x720. One of the previous posts seemed to explain it quite well. So I've sort of given up on that idea. I'm just left confused as to why it can use 60hz in full screen games running at 1920x1080. It's definitely running 60fps with vsync when using 1920x1080 in games. I have benchmarking tools that show it and my eyes can definitely tell the difference between 30 and 60fps. Strange :/
 
#16 ·
Quote:
Originally Posted by ET900 View Post

Well I'm using Nvidia but I know amd stuff well as I've pretty much always had ati cards until this 670, so I can relate what you're saying to the nvidia options. I am using 1920x1080i as I said... Every res I choose above 1280x720 will force 30hz. Only 1280x720 and below can use 60hz on the desktop, apparently... I did think to check the tv but there's nothing I can do there. It's pretty basic! :/
Also I'm not sure if anyone misunderstood but the flickering I experience isn't all that severe. It's still usable but pretty annoying on the eyes. I mean, I feel pretty certain I can't successfully run the desktop above 30hz if I want to use a res above 1280x720. One of the previous posts seemed to explain it quite well. So I've sort of given up on that idea. I'm just left confused as to why it can use 60hz in full screen games running at 1920x1080. It's definitely running 60fps with vsync when using 1920x1080 in games. I have benchmarking tools that show it and my eyes can definitely tell the difference between 30 and 60fps. Strange :/
I'd imagine the issue with the games is probably they THINK they are running at 60Hz but the TV is probably only displaying at 30Hz. Since the games are allowed to render to a higher FPS it is possible that they could appear smoother without any actual increase in FPS.
 
#17 ·
Quote:
Originally Posted by DirektEffekt View Post

I'd imagine the issue with the games is probably they THINK they are running at 60Hz but the TV is probably only displaying at 30Hz. Since the games are allowed to render to a higher FPS it is possible that they could appear smoother without any actual increase in FPS.
But if the screen is only displaying 30fps what difference does it make to smoothness? Also vsync locks the framerate at the monitors refresh rate meaning that 60fps = 60hz.
 
#18 ·
Quote:
Originally Posted by ET900 View Post

But if the screen is only displaying 30fps what difference does it make to smoothness? Also vsync locks the framerate at the monitors refresh rate meaning that 60fps = 60hz.
Well, the TV is incapable of displaying 60Hz so it can't be. It is likely due to the way the game renders. If that's how it thinks it is rendering it is possible that the game is rendering 60 FPS but only half of each frame is being displayed in an interlaced pattern which could mean the image appears smoother because the image is being updated more quickly, if only half at a time, as opposed to rendering one entire frame at 30 FPS. If that makes sense.
 
#19 ·
Quote:
Originally Posted by DirektEffekt View Post

Well, the TV is incapable of displaying 60Hz so it can't be. It is likely due to the way the game renders. If that's how it thinks it is rendering it is possible that the game is rendering 60 FPS but only half of each frame is being displayed in an interlaced pattern which could mean the image appears smoother because the image is being updated more quickly, if only half at a time, as opposed to rendering one entire frame at 30 FPS. If that makes sense.
sort of. wouldn't i be experiencing some image tearing in that case? because i'm not with vsync. but maybe this explains the ghosting i am experiencing? i thought that was down to the response time, though i don't have a deep understanding of what response time is compared to the refresh rate... thanks.
 
#20 ·
Quote:
Originally Posted by ET900 View Post

sort of. wouldn't i be experiencing some image tearing in that case? because i'm not with vsync. but maybe this explains the ghosting i am experiencing? i thought that was down to the response time, though i don't have a deep understanding of what response time is compared to the refresh rate... thanks.
Tearing is actually due to the game loading the next frame before the last is rendered, so different parts of each displayed frames come from different rendered frames. Because the image is interlaced this might actually be mitigated slightly by that fact. Ghosting should be due to the refresh rate though. Effects from the game rendering as I suggested would be more like an odd misalignment of alternating rows of pixels.
 
#21 ·
Quote:
Originally Posted by DirektEffekt View Post

Tearing is actually due to the game loading the next frame before the last is rendered, so different parts of each displayed frames come from different rendered frames. Because the image is interlaced this might actually be mitigated slightly by that fact. Ghosting should be due to the refresh rate though. Effects from the game rendering as I suggested would be more like an odd misalignment of alternating rows of pixels.
Ok I sorta get ya haha. I still get the ghosting at 1280x720 @60hz though after testing. It's cool, I'll just accept it as it is. Thanks for all the help all
smile.gif
 
#22 ·
#24 ·
Quote:
Originally Posted by ET900 View Post

Quote:
Originally Posted by DirektEffekt View Post

1080i is interlaced. i.e. Half the screen is loaded at a time, that means that on a 60Hz panel the maximum true refresh rate is 30Hz. Your screen can't actually go above 30Hz. If you want to be able to game or anything at 1080 resolution you will need a 1080p screen. It's likely that the issue becomes less apparent during games but it would still be there.
Yeh I knew it meant interlaced, just wasn't sure what interlaced even meant haha... That's strange though, because when I play games with vsync the framerate is locking at 60fps and it clearly is running at 60fps! I can tell the difference between 30fps and 60fps easy!! :/
Quote:
Originally Posted by Layo View Post

Yea
frown.gif

Is your desktop "larger" then the TV too? I can't see like half of icon on ides and around 70% of taskbar. Didn't really play with resolutions or anything yet.
Yeh it does go off the screen a bit. Does the same at 1280x720p also. I think the pixels are there but just hidden behind the plastic. Not completely sure...

Quote:
Originally Posted by drbaltazar View Post

Amd 1920 x1080i30 or 29hertz is 59 or 60 "remember its I so only half get refreshed.try 29 .if yor at 30 (default lot of time everything act up.at 29 your below the electricity refresh of 60.most likely your issue is wcs default setting.change percepetual to restricted or similar name (sorry I am on the road.restricted will use same color squeem without any conversion (which is what cause lag (maybe in w8 ms accelerate this .till then restricted color is best .dont use absolute color .it is a resource hog .its intended for high end system
I get ya. I tried going below 30hz it but it didn't make any difference. Thanks for the suggestion though
smile.gif


Quote:
Originally Posted by DirektEffekt View Post

That's just how most TV's are designed. It's from back in the days pf CRTs and video tapes, where the frame didn't fill the entire resolution; there were just black bars around the edges. To compensate for this TVs were built with the extend of the screen extending behind the bezel. This tradition has, thanks to old habits, so that the outside 40 pixels or so are not actually visible on most TV sets. I believe this is, however, mostly software these days and there may or may not be an option to turn it on or off.
If I want everything to fit on the screen I have to use a custom res which is a little below 1080 or 720. Unless you're saying there should be another way?
ignore what the gpu say,at 29 it will be 29 check in windows instead.(yes gpu still say 30 why because if you round up you end up with 30 ,29.97 so technicly gpu is right and window is right)ya i know its stupid real value should be written.ask ms why their security cant be turned back on if i use universal time in w7 or why aero prevent java acceleration
 
#25 ·
Quote:
Originally Posted by drbaltazar View Post

ignore what the gpu say,at 29 it will be 29 check in windows instead.(yes gpu still say 30 why because if you round up you end up with 30 ,29.97 so technicly gpu is right and window is right)ya i know its stupid real value should be written.ask ms why their security cant be turned back on if i use universal time in w7 or why aero prevent java acceleration
I'm slightly confused by what you're trying to say exactly.
 
#26 ·
Quote:
Originally Posted by ET900 View Post

I'm slightly confused by what you're trying to say exactly.
It sounds like an anti-Microsoft rant if I have deciphered it correctly. Also something to do with standard DVD frame rates maybe? I know the standard for NTSC is 29.97 FPS, but if your connected with HDMI or anything other than component then it will be running at the real refresh rate.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top