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120hz versus 240hz

Discussion in 'Electronic Repair' started by Chris, Feb 25, 2010.

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  1. Chris

    Chris Guest

    I am considering the purchase of an LED television. However, before I do, I
    would like to know what the difference is between 120 & 240hz; other than
    the numbers. I've done some research, but there seems to be a wide array of
    conflicting opinions. I know that it has to do with refresh rate, jitter,
    and blur. So, if anyone has some straightforward input on the matter, I'm
    all (grateful) ears.

  2. Sylvia Else

    Sylvia Else Guest

    An alien with 240Hz eyes might appreciate[*] the higher frequency
    version, but unless you're such an alien living on Earth incognito,
    don't waste your money.


    [*] Ignoring the fact that colour displays are finely tuned to the way
    that human colour vision works, and an alien would likely wonder what
    we'd been smoking.
  3. First, the only televisions that use LEDs use OLEDs. There are none using
    conventional LEDs.

    Second, there are no strict definitions of what these refresh rates mean. In
    some cases, the set generates an interpolated image at that rate, in others,
    a blank (black) raster is inserted. Some sets combine both.

    I don't like this enhancement (which was one of the reasons I bought a
    plasma set). It has a nasty side-effect -- it makes motion pictures look
    like video. This might be fine for a TV show; it isn't when you're watching
    movies. Be sure that whatever set you purchase has some way of defeating it
    the enhancement.

    You need to actually look at the sets you're considering with program
    material you're familiar with.
  4. Ignoring the fact that colour displays are finely tuned
    This has nothing whatever to do with color rendition.

    Who is Sylvia, anyway?
  5. Adrian C

    Adrian C Guest

    none ??
  6. First, the only televisions that use LEDs use OLEDs.
    Nope. The only sets available use LCDs, plasma, and OLEDs.
  7. Phil Allison

    Phil Allison Guest

    "William Sommerwanker IDIOT "
    "Sylvia Else"

    ** And if you put the remark back into its context - what it IS relevant
    to becomes obvious.;

    FUCKWIT !!

    ... Phil
  8. Phil Allison

    Phil Allison Guest

    "William Sommerwanker IDIOT "

    ** Fraid " LED TVs " are on sale all over the world right now.

    FUCKWIT !!

    ..... Phil
  9. Sylvia Else

    Sylvia Else Guest

    Did I say it had? I was attaching a caveat to the word "appreciate".
    Sylvia is Sylvia Else.

    Sylvia (Else).
  10. Phil Allison

    Phil Allison Guest

    "Arfa Daily"
    ** But they are called " LED TVs " by their makers and so are

    *KNOWN BY THAT NAME* to members of the public.

    Fools like YOU and Sommerwanker would complain that a bottle of "Steak
    Sauce" contained no steak.

    ..... Phil
  11. Fools like YOU and Sommerwanker would complain
    And, as we all know, Girl Scout Cookies are not made from Girl Scouts.
  12. Since the subject's been broached, may I ask: are you a woman? I ask
    because, well, 99.9% of the other posters here aren't, and it's unusual
    to see a woman posting in such a newsgroup (actually pretty much on
    Usenet in general, a few newsgroups excepted).

    None of my business, I know, but I'm curious.
  13. Sylvia Else

    Sylvia Else Guest

    Yes, I am.

  14. N_Cook

    N_Cook Guest

    Ah that explains why I cannot watch these things for more than a few
    minutes, I'm an alien. Would anyone know what the equivalent refresh rate is
    for good old CRT technology ? As far as fast movement across the image is
    concerned, motion jitter or judder or whatever the term is. What refresh
    rate would have to be there before I cannot tell the difference between that
    part of the technologies?
  15. Adrian C

    Adrian C Guest

    Yup :)

    Don't know in the US, but over here when folks speak of an LED
    television, it's now accepted it's an LCD with a LED backlight.

    Besides I've read that Sony have dropped their plans to go to large
    scale manufacture with OLED for the moment.
  16. Sylvia Else

    Sylvia Else Guest

    CRT TVs refresh at 50Hz or 60Hz (near enough) depending on region.

    Since a TV program will only contain images (interlaced) at that rate -
    or frequently less - a TV that purports to offer a higher refresh rate
    will have to create the extra images by some kind of interpolation. If
    it does a bad job, then the result will be unwatchable regardless of how
    high the refresh rate is.

  17. Sylvia Else

    Sylvia Else Guest

    But the terms don't have a clearly defined meaning. Indeed, even if they
    did, the typical consumer probably wouldn't know what they meant. If
    people buy stuff based on not particularly meaningful, but good
    sounding, hype, they really have only themselves to blame.

  18. N_Cook

    N_Cook Guest

    Perhaps its a PAL/NTSC thing. Whatever it is all the LCD TVs I've looked at
    with plenty of action/movement on the screen ,I find as irritating as those
    digital overlain adverts on hoardings around the sides of TV coverage of
    football/soccer viewed on CRT TV. But I don't watch soccer so thats no
    problem to me

    To the OP , my advice.
    Never buy a TV that the seller will only display cartoons on. Try viewing a
    source showing plenty of greens and dark sections of images and of course
    fast cross-screen mobvement examples.
  19. And why aren't all LCD sets known by the name of the backlight?

    Exactly. At least in plasma TVs, the thing producing the light also produces
    the image.

    And if you really want to get picky... I'm not sure it's really plasma. It's
    ionized gas, and the degree of ionization isn't high enough to be considered
    a true plasma. I think.
  20. If you are seriously considering the purchase of a flatscreen TV of any
    Yes, yes, yes, yes, yes.

    Yes, but... I'm surprised at the wide viewing angles of many LCDs, even
    close to the screen. It no longer seems to be a problem, unless the
    mishpoche has gathered to watch.

    Yes and no. Most sets do a poor job upconverting 480i to 1080p, and the
    result can be smeary. The solution is to get cable, with many programs
    available at native resolutions of 720p or 1080i. The image quality can
    equal Blu-ray.

    It depends. I have a 32" 720p set in my den, and it has no trouble with
    1080i signals.

    ....and wanting it you will be...
    "Home Entertainment" magazine gave a near-frothing-at-the-mouth review to a
    48" Panasonic plasma that goes for $1500.

    One final point -- don't be overly impressed by the brightest set. Look
    critically at the image, with a variety of material.

    By the way, I've seen the Samsung "LED" set repeatedly at Fry's. I don't
    like it. I can't quite put my finger on it, but it looks "garish". This
    might be the way the sample was set up, or it might be inherent. If I were
    buying an LCD set, it would probably be a Sony.
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