Home Forums General Discussion TV colour problems

This topic contains 6 replies, has 3 voices, and was last updated by  Anonymous 14 years, 3 months ago.

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  • #4288


    I posted this on GameDev.net as well, see what people thought, just wanted to check if anyone here has any idea what the deal is with my new tv. PS cause I was doing it on GameDev I spelt color sometimes, and colour other times.

    This is a bit of a long shot but wondering whether anyone here has every tried playing a game on a low refresh rate monitor. We bought a flatscreen Philips TV recently and it does something kind of weird. It seems to refresh pixels slowly, as in if something blue moves on the screen, some of the pixels which represented the blue object would still be blue, but faded even though the colour should have been refreshed. This isn’t just for games, even when watching tv, some colors stay on screen, that shouldn’t be there. My opinion is that the refresh rate is nowhere near the 100Hz that we were promised, and that’s why some pixels appear to still be a color, that they were previously but aren’t any more. I know this probably makes no sense the way I’ve discribed it, but if anyone has experienced anything like this before, any info is much appreciated.


  • #22528


    I’m assuming its a flat panel LCD screen….

    Strictly speaking LCD don’t actually have a refresh rate, as they don’t refresh the screen the same way as CRTs

    The phenonemenon you’re seeing is called ghosting, and is a result of a low response time of the screen(a response time is a measue of how quickly a pixel can be changed from one colour to another). Generally anything below 16ms will create ghosting. If you do a google search on your screen type I’ll bet you’ll find it has a response time of about 25ms, which aren’t really suitable for action movies, or gaming where the screen must update at a quick pace.

    If it’s not an LCD ignore this babble :lol:

  • #22529


    Ah that’s a good answer. Checked it on google can’t find a response time for it but this has all it’s details and a price much more competitive than what we bought it for 2weeks ago.


    Is ghosting more evident in changes from primary colours? I first noticed it watching Simpson’s. The blues seemed to leave a trail if they stoped then moved off quickly. Then I noticed it in the red screen that flashes on the confederations cup match, and thought it would have something to do with refresh rate. Gives it on link as 100Hz, but considering what you said, it might be resopnse time which isn’t mentioned anywhere?

    Thanks for the help, I’ll maybe try to get onto Philips to see what they say about it, at least this way I won’t sound like a total fool.


  • #22534


    That’s not a flat panel LCD TV… so ignore the babble. It’s a tube based television. I don’t understand how you could get ghosting on something like that it doesn’t really make sense especially if the refresh rate is 100Hz. Do you know anyone with a similar Philips screen to see what the image quality is like on it? Anyone else on the boards have more experience with this kind of stuff.

    From what I’ve found in Google is that ghosting can be caused by a bad video cable termination. Possibly try a different cable, if that doesn’t help I’d check the warranty.

    Sorry for the confusion

  • #22535


    I haven’t checked what happens when playing DVDs, it’s a different scart lead/socket so I’ll try moving them around tomorrow. Also there’s different colour formats that I’ll try out, like real colour, true colour etc. but I think it’s getting more and more obvious, but it might just be cause I’m looking for it.


  • #22539


    Could be that digital data only is fed to the tube (some sort of filtering H/W or S/W device between tuner and tube, or tuner itself is digital) and that poor processing results in artefact-laden image fed to the tube.

    As posted before, try SCART-based AV input (console or DVD), as image fed to the tube should be that output by the console/DVD. If pixellation/ghosting still there, filtering H/W or S/W device could be sitting between tube and both tuner and I/Os, in which case return the TV as a faulty/sub-spec. :cry:

  • #22666


    I don’t know why, but switch the digi box scart into the top scart socket of the tv seems to have redued the problems. Might only be temporary but definately an improvement? Strange.

    Edit: Forgot thanks for the help too.

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