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  • Re: monitor diagonal lines

    From Luke@luke_a_p@hotmail.com to comp.sys.ibm.pc.hardware.video,sci.electronics.repair,comp.os.ms-windows.misc,comp.sys.mac.hardware.video,rec.photo.digital on Thursday, July 31, 2003 19:04:02
    From Newsgroup: comp.os.ms-windows.misc

    Yeah it is caused by interference between the pixel grid of the image and
    the dot pitch of the monitor.

    It's probably more likely to happen when you are running a buget monitor at
    a high resolution because cheaper monitors do not have such a fine dot
    pitch.

    So try changing the resolution or even just changing the size of the image using the monitors geometry controls.

    Also try cleaning your screen, sounds silly but fine streaky marks, residue from careless cleaning or fine scratches can cause the same effect, so just check that is not the cause.

    Luke


    "Rick Wilson" <nospam@earthlink.net> wrote in message news:atqfon$1ph2b$1@ID-82690.news.dfncis.de...
    "Michael P. Broida" <michael.p.broida@boeing.com> wrote in message
    news:3E00BBF8.6CA427B6@boeing.com...
    Anna wrote:

    hi,
    whenever i bend forward (rather quickly) towards the monitor or lean
    back and i'm looking at a fixed point on a white (or otherwise bright colour) background, i see vague white diagonal lines sort of crossing eachother and converging at the spot i'm looking at. they disappear
    when i stop moving my head. is this common for all monitors or is it
    this brand (samtron) or is any setting wrong? it can get annoying if i move forward or backwards in my chair when i'm reading text against a white background or working on images that have a lot of white.
    refresh rate is 85 hz but even setting it to 100 doesnt seem to help much.

    Sounds like a Moire pattern. Some monitors have
    adjustments that are supposed to reduce that, but
    I've never seen it help. Some people don't even
    notice them anyway. Do you wear glasses? Strong
    corrective lenses can make it more obvious, I think.

    Try turning down the brightness/contrast a bit.

    Biggest help: clean the glass on your monitor. :)
    Spots on the monitor make it easier to see those
    patterns. And clean your glasses as well. :)

    Also try a different resolution on the monitor.

    RickW





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  • From Bob Myers@nospamplease@addressinvalid.com to comp.sys.ibm.pc.hardware.video,sci.electronics.repair,comp.os.ms-windows.misc,comp.sys.mac.hardware.video,rec.photo.digital on Thursday, July 31, 2003 16:40:56
    From Newsgroup: comp.os.ms-windows.misc


    "Luke" <luke_a_p@hotmail.com> wrote in message news:bgbp72$hq8$1@sparta.btinternet.com...
    Yeah it is caused by interference between the pixel grid of the image and
    the dot pitch of the monitor.

    No, I'm afraid not. What everyone is missing so far is the
    following from the original:


    hi,
    whenever i bend forward (rather quickly) towards the monitor or lean
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    back and i'm looking at a fixed point on a white (or otherwise
    bright
    colour) background, i see vague white diagonal lines sort of
    crossing
    eachother and converging at the spot i'm looking at. they disappear when i stop moving my head.

    Moire is NOT going to be affected by the motion of the
    observer.

    What's happening is simply the fact that if someone moves
    quickly enough, such that a CRT monitor screen passes rapidly
    through the field of view (and especially if this were going on in a
    darkened environment, such that the monitor is the brightest object
    in the field), you can see all sorts of such artifacts caused by the
    normal raster-scan action of the display. It is perfectly normal,
    and nothing to be concerned about.

    Bob M.



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  • From james@jjames700@earthlink.net to comp.sys.ibm.pc.hardware.video,sci.electronics.repair,comp.os.ms-windows.misc,comp.sys.mac.hardware.video,rec.photo.digital on Friday, August 01, 2003 00:42:51
    From Newsgroup: comp.os.ms-windows.misc

    When I worked in a TV shop we called those Retrace lines. It's when the electron beam that scans the image onto the tube gets to the bottom and goes back up and starts again. On a computer monitor it seems that would be hard
    to see. I've seen it on old tv's.
    james
    (oh, and I would not worry about it until it starts showing all the time)

    "Bob Myers" <nospamplease@addressinvalid.com> wrote in message news:3f29a0aa$1@usenet01.boi.hp.com...

    "Luke" <luke_a_p@hotmail.com> wrote in message news:bgbp72$hq8$1@sparta.btinternet.com...
    Yeah it is caused by interference between the pixel grid of the image
    and
    the dot pitch of the monitor.

    No, I'm afraid not. What everyone is missing so far is the
    following from the original:


    hi,
    whenever i bend forward (rather quickly) towards the monitor or
    lean
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    back and i'm looking at a fixed point on a white (or otherwise
    bright
    colour) background, i see vague white diagonal lines sort of
    crossing
    eachother and converging at the spot i'm looking at. they
    disappear
    when i stop moving my head.

    Moire is NOT going to be affected by the motion of the
    observer.

    What's happening is simply the fact that if someone moves
    quickly enough, such that a CRT monitor screen passes rapidly
    through the field of view (and especially if this were going on in a
    darkened environment, such that the monitor is the brightest object
    in the field), you can see all sorts of such artifacts caused by the
    normal raster-scan action of the display. It is perfectly normal,
    and nothing to be concerned about.

    Bob M.






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