Imac screen flickers when scrolling

Flickering / flickering when moving the mouse pointer / scrolling: Really normal?

  • Hello!

    After having spent half a day using the search function and Google without having finally answered my question (s), I will formulate them here. I would be really grateful for any help, otherwise I still despair.

    Brief history: After I noticed how the old CRT was damaging my eyes, I switched to my first TFT and, after testing several, ended up with a used Belinea 101751.

    Between testing the first two devices and buying the new one, I installed a decent graphics card. And replaced my onboard graphics card with the Ati Radeon PowerColor 9250. There is also the TFT via DVI.

    The Belinea 101751 makes a good impression, but I have the same problems as with the previous test devices, despite the installation of graphics cards in the meantime:

    - My eyes hurt after 1-2 hours. Well, that could be due to the time it takes to get used to it, as I said, it's my "first" own LCD.
    - If I move the mouse pointer sooooooo slowly, it flickers / flickers unmistakably. In a dimension that I wonder if that's really normal.
    - Scrolling is only halfway bearable with the mouse wheel, but even that hardly. If I take the scrollbar, the whole screen shakes, absolutely unbearable. I have already read about this effect in my search. But it is so drastic for me that I really wonder if this is normal.
    - Of course, this does not only apply to scrolling, but also to texts when they move, in fields like this one.
    - After scrolling dark backgrounds you will find horizontal stripes on them.

    Every now and then I work quarter of an hour on a different, relatively new PC with a different TFT with a similar response time. With that none of this occurs. It can be navigated or scrolled wonderfully with the mouse.

    With the CRT before, nothing flickered when scrolling, went perfectly. On the other hand, both test TFTs did. So I think that this computer is not compatible with TFTs. Or something goes wrong.

    What do you all mean:
    - Is that due to the device (not the fastest with a response time of 25ms)?
    - Could the two graphics cards, i.e. the PCI graphics card and the onboard graphics card, "bite" each other? Should I expand the latter? Didn't even know if and how it works with an onboard card. Both drivers are installed accordingly (the current one for the Ati Radeon), but that of the onboard card is deactivated.
    - Is it because of the small amount of RAM that may affect the hardware acceleration? I'm (still) working with a meager 96MB of RAM.

    Oh yes, "Optimized scrolling is of course activated in IE. But the problem occurs in all programs anyway.

    I really don’t know what to do next, except that it’s not a permanent state of affairs.

    Thank you in advance!

  • Have you ever been able to test your Tft on another PC (e.g. the one you wrote that you couldn't see there)?
    If it doesn't appear there, it could be a Windows problem.

  • A very good idea, thank you. I just connected the TFT to my notebook in the same way. The dragging effect could also be observed there, albeit significantly weaker. The same applies to the flickering when moving the mouse pointer.

    How is it with you? Do the effects also occur there?

    And how long can it be before I sit in front of the TFT without getting a headache? :O

  • The clear tracing of a color fringing (streaking) on ​​the mouse arrow was only seen on displays with a VA panel without Overdrive. A "flickering" of the mouse arrow when moving across the desktop, I have never had a display.

    The time to get used to it is usually from 1 day to approx. 2 weeks, that is just very individual. For some it can take longer and there are certainly people who cannot cope with a TFT at all.

    *** whatever happens, happens ... ***

    Please note the board rules and our purchase advice is always worth a look!

  • In my opinion, there is nothing you can do about it. I have an older TN panel with 16ms and even then the text flickers when scrolling, which is even more the case with a slower VA panel, for example the older FSC devices.

    If it is so noticeable and still bothers you after getting used to it, you should use another device. I have the FSC P17-2 with S-PVA and overdrive right here. This display hardly flickers at all.

    Greetings Rinaldo

    _. + * "Mind Expanding Species" * + ._. + * "Estar De Viaje" * + ._

    "Encounters that touch the soul leave traces that never completely disappear."

  • Then maybe I thought TFT technology was more sophisticated than it really is?

    Sure, the picture is super sharp, and all the other highly praised advantages have not remained hidden from me. But certain functions that were taken for granted on the CRT simply cannot be carried out on the TFT.

    Example: When I click on my scroll wheel, a navigation circle appears with arrows in all directions, with the help of which I can scroll slowly in all directions. But now it is hardly possible on the TFT because the whole page then flickers like a stroboscope. And reading while scrolling, as I was used to, is no longer possible. Well, I hope I get used to it too.

    Oh yeah, could it really not be related to low memory? 96MB with Windows 98? Doesn't that also affect the graphics card / hardware acceleration etc.? Fortunately, a 512 bar has already been ordered, so I'll know more soon.

    And: should you really not operate a TFT with backlighting? The sun shines directly on the device over my back. Otherwise I would have to rearrange the whole study here.

    Thank you for your nice step-in help!

  • The way I see it, you've bought the wrong display! The 101751 has a PVA panel without overdrive, so the TFT has good color quality and a large viewing angle, but the responsiveness of VA panels without overdrive is just not the best.

    A TFT is a completely different display technology than a CRT and therefore of course also has different properties.

    *** whatever happens, happens ... ***

    Please note the board rules and our purchase advice is always worth a look!

  • The way I see it, you've bought the wrong display! The 101751 has a PVA panel without overdrive, so the TFT has good color quality and a large viewing angle, but the responsiveness of VA panels without overdrive is just not the best.

    The way I see it, there is unfortunately no panel without serious disadvantages. Since I'm a non-gamer and work a lot with Internet / Office and a bit with photos, I didn't attach too much importance to the response time.

    In addition, I initially had two other displays to test on this computer, including one with 8ms, but I observed similar effects.

    A TFT is a completely different display technology than a CRT and therefore of course also has different properties.

    Already clear. And the picture is also much better, which I wouldn't want to be without after a few days.

    But I still can't get rid of the feeling that it's not the TFT for me, but the software settings or other hardware that the mouse pointer flickers, e.g. when moving slowly on a white background.

    A little is normal, of course, but now in the most recent comparison with other TFTs on other computers that is very strong. The same applies to said scroll effect. Does the font really look twice as bold for you if, for example, you move the scroll bar slowly while holding down the mouse button?

    Well, you get used to everything. So far, many thanks for your help!

  • So I have two monitors connected to the same hardware here. One has a TN panel with a response time of 16 ms, the other an S-PVA panel with overdrive and a response time of 14 ms. With the TN display, the image clearly flickers when scrolling, an effect that is even more pronounced with a slower PVA panel such as the Belinea 101751. With the overdrive-equipped display (FSC P17-2), the image hardly flickers at all, and texts are easily readable when scrolling.

    If the effect bothers you permanently, another display like the FSC P17-2 could satisfy you.

    Greetings Rinaldo

    _. + * "Mind Expanding Species" * + ._. + * "Estar De Viaje" * + ._

    "Encounters that touch the soul leave traces that never completely disappear."

  • One more thing: Is it normal for the image (i.e. this area) to flicker slightly with large areas in certain background colors?

    For example the beige below

  • Just tested on a Sony 16ms TN display: nothing flickers.

    But I've been working on TFTs for many years, maybe I'm already hardened

  • I received my Belinea 101920 today. However, while scrolling, I can't even think of reading the text. On the one hand it is very blurred and on the other hand the picture "jumps" (when I scroll with the mouse wheel pressed).

    How can you reduce this effect?

  • I advise every TFT user to deactivate "optimized scrolling" or "smooth scrolling". After that, scrolling with the mouse wheel, the cursor keys and the arrow keys on the scroll bar is much more pleasant and less washed-out.

    It also makes sense to compare between 60Hz and 75Hz, it may well be that one of the two settings is more pleasant.

    Unmoving surfaces shouldn't flicker at all on the TFT, that sounds like a defect in the monitor or possibly the cable.

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