Aura HD display "spotty" or inconsistent?

lukeoftheaura · 05-19-2018, 01:17 PM

On my kobo aura HD, the display of the device seems spotty or inconsistent - some pixels seem to be a lighter color than others, some pixels doesn't seem to display anything, etc. However, you can't seem to see any of these problems on the "powered off" screen, and they're inconsistent between screen refreshes. Is this normal and expected of eInk or is my device damaged, because it's driving me crazy.

Abtacha · 05-19-2018, 01:51 PM

You might be seeing ghosting, try changing the screen refresh to every page in the reading settings and see if that helps.

lukeoftheaura · 05-19-2018, 02:10 PM

Quote:

Originally Posted by Abtacha

You might be seeing ghosting, try changing the screen refresh to every page in the reading settings and see if that helps.

that seems to have worked for nickel somewhat, although menus and such still have this issue. Is there also a way to change this in koreader and plato?

GeoffR · 05-19-2018, 02:15 PM

Some fonts can look spotty because of faulty hinting, if you are using a sideloaded font, try switching to one of the built-in fonts to compare. If the problem is with the sideloaded font, it can be fixed by using a program such as fontforge to remove the hinting.

lukeoftheaura · 05-19-2018, 02:42 PM

Quote:

Originally Posted by GeoffR

Some fonts can look spotty because of faulty hinting, if you are using a sideloaded font, try switching to one of the built-in fonts to compare. If the problem is with the sideloaded font, it can be fixed by using a program such as fontforge to remove the hinting.

I'm not using a sideloaded font, this is just with the default fonts in menus (and some UI elements like sliders etc)

JeanOlivier · 05-23-2018, 01:39 PM

Quote:

Originally Posted by lukeoftheaura

I'm not using a sideloaded font, this is just with the default fonts in menus (and some UI elements like sliders etc)

It's normal to be able to discern what was previously on the screen even after it was "erased" with a eink display, it's called ghosting. The only fix for that is to do a full refresh of the screen, the one that flashes black and white before displaying the proper image.

Personally, I don't really mind the ghosting when reading books, it reminds me of the translucency of paper where you can see the text on the other side of the page, after a few page turns is averages out to indiscernible blobs anyways..

I do full refreshes after I close most menus though, as the structured lines are annoying.

05-19-2018, 01:17 PM	#1
lukeoftheaura Enthusiast Posts: 28 Karma: 10 Join Date: May 2018 Device: Kobo Aura HD	display "spotty" or inconsistent? On my kobo aura HD, the display of the device seems spotty or inconsistent - some pixels seem to be a lighter color than others, some pixels doesn't seem to display anything, etc. However, you can't seem to see any of these problems on the "powered off" screen, and they're inconsistent between screen refreshes. Is this normal and expected of eInk or is my device damaged, because it's driving me crazy.

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05-19-2018, 01:51 PM	#2
Abtacha Addict Posts: 332 Karma: 6220000 Join Date: Jul 2011 Location: Germany Device: Kobo Aura HD	You might be seeing ghosting, try changing the screen refresh to every page in the reading settings and see if that helps.

05-19-2018, 02:15 PM	#4
GeoffR Wizard Posts: 3,821 Karma: 19162882 Join Date: Nov 2012 Location: Te Riu-a-Māui Device: Kobo Glo	Some fonts can look spotty because of faulty hinting, if you are using a sideloaded font, try switching to one of the built-in fonts to compare. If the problem is with the sideloaded font, it can be fixed by using a program such as fontforge to remove the hinting.