Member Avatar for mahela007

I seem to have a problem with my acer LCD screen. I didn't notice this before, but when the contrast settings of the monitor are increased, the left vertical edges of letters seem to have a purple tinge. This is especially noticeable where there are double L's or double I s. I have clear type enabled and I also ran MSs Clear type tuning tool to no avail. Do you guys know what can be causing the problem?
Thanks.

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This is the classic sign of subpixel font smoothing interacting badly with the display, not necessarily a dead panel. ClearType (and other subpixel antialiasing) sharpens text by drawing to the individual red/green/blue subpixels in each pixel. If the subpixel order or alignment is different from what the OS/driver expects, or if pixels are not being mapped 1:1 (non‑native resolution, GPU/monitor scaling or an analog VGA connection), you get colored fringes on vertical strokes. Since reports the tint disappears when font smoothing is turned off, that strongly suggests a rendering/alignment issue rather than an electrical fault. raised a reasonable hardware possibility and ’s suggestion to test another monitor is exactly the right diagnostic direction.

Try these steps in order to isolate and fix the cause:

  • Confirm the monitor is set to its native resolution and refresh rate in the OS display settings (no DPI scaling while testing).
  • Use a digital video cable (DVI/HDMI/DisplayPort) instead of VGA; analog scaling often breaks subpixel alignment.
  • Run the ClearType/ font-smoothing tuner in Windows (search "Adjust ClearType text"); if tuning does not help, switch ClearType off to use grayscale smoothing.
  • Update the graphics driver and install the correct monitor driver/INF so Windows knows the panel geometry.
  • If the display is rotated 90 degrees, disable subpixel smoothing (rotation changes subpixel orientation and causes color fringes).
  • Diagnostic trick: take a screenshot of the offending text (PrintScreen, paste to Paint). If the screenshot shows the same purple/green edges on another monitor, the rendering produced those pixels (software/driver). If the screenshot is clean but the actual screen still shows fringes, the problem is the panel, cable or EDID/driver mismatch.

If you want ClearType without color fringing, the reliable fix is a pixel-perfect path: native resolution + digital cable + correct drivers. Otherwise use grayscale smoothing to eliminate the tinge.

Recommended Answers

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Member Avatar for Rik_

Your screen has developed a fault and will need to be replaced soon! I have seen the same problem a couple of times before.

Member Avatar for Michael Truman

Your screen has developed a fault and will need to be replaced soon! I have seen the same problem a couple of times before.

If the monitor is the reason of this fault, then why that does only happen at the high resolution. I think you must try another monitor on the same PC resolution and check again this error.

Member Avatar for mahela007

It can't be my monitor because the problem disappears when I disable font smoothing (i.e clear type).

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