Inverted pixels on Kobo Aura One

RobertJSawyer · 02-09-2017, 06:39 PM

I just bought a Kobo Aura One, and so far am impressed. But a small c-shaped cluster of pixels is inverted -- it's black when it should be white, and white when it should be black. Of course, it's very tiny on this high-resolution screen, but it's still noticeable and bothersome to me. The c-shape of the cluster is only discernable when looking at the screen with a jeweler's loupe.

I haven't installed the inverse-video night-mode hack or anything else; this is fresh-out-of-the-box.

I've never seen anything like it on a Kobo E Ink device, and I've owned most models. On LCD displays, of course, you can get a stuck pixel that always remains one color -- but that's not what's happening here. And previous models of Kobo had the bright-pinprick-of-light problem that many have experienced, caused, perhaps, by dust or another defect in the screen coating. But this cluster isn't brighter or darker than any other pixels.

I can reliably observe these pixels doing the opposite of what all their neighbors are doing by going to menu Help | Getting Started, and paging back and forth between pages 8 and 9. The inverted pixels show as a white spot in the black circle on page eight, and a black freckle on the middle finger of the right hand on page 9. (The effect shows up all the time, regardless of what's on screen; the problem is NOT a defect in the images being displayed on those particular screens.)

Again, these pixels are not stuck; they're responding to input somehow, but doing the opposite of what they're supposed to do. Anyone seen anything like this before? Anyone know of a way to get rebel pixels to stop misbehaving? I've got screen refresh set to every page, and have tried numerous page changes in hopes that the bounce to inverse video at each page change would help, but it hasn't.

Many thanks!

robko · 02-09-2017, 08:33 PM

That sounds like a manufacturing defect

. Something must have gotten crossed somewhere.

frostschutz · 02-10-2017, 12:13 PM

can you make a few pictures or video of the issue? never seen before what you described.

if it was actual inversion and the area could be identified exactly, then it should be possible to work around the issue in software but... for a new device... get a replacement.

sometimes a pixel cell burst and then you have a black or white splotch on the screen that never goes away, but it would not invert...

02-09-2017, 06:39 PM	#1
RobertJSawyer Guru Posts: 730 Karma: 3871570 Join Date: Jun 2006 Location: Toronto Device: Kobo Libra 2, Clara 2E, and Clara HD; Kindle PaperWhite	Inverted pixels on Kobo Aura One I just bought a Kobo Aura One, and so far am impressed. But a small c-shaped cluster of pixels is inverted -- it's black when it should be white, and white when it should be black. Of course, it's very tiny on this high-resolution screen, but it's still noticeable and bothersome to me. The c-shape of the cluster is only discernable when looking at the screen with a jeweler's loupe. I haven't installed the inverse-video night-mode hack or anything else; this is fresh-out-of-the-box. I've never seen anything like it on a Kobo E Ink device, and I've owned most models. On LCD displays, of course, you can get a stuck pixel that always remains one color -- but that's not what's happening here. And previous models of Kobo had the bright-pinprick-of-light problem that many have experienced, caused, perhaps, by dust or another defect in the screen coating. But this cluster isn't brighter or darker than any other pixels. I can reliably observe these pixels doing the opposite of what all their neighbors are doing by going to menu Help \| Getting Started, and paging back and forth between pages 8 and 9. The inverted pixels show as a white spot in the black circle on page eight, and a black freckle on the middle finger of the right hand on page 9. (The effect shows up all the time, regardless of what's on screen; the problem is NOT a defect in the images being displayed on those particular screens.) Again, these pixels are not stuck; they're responding to input somehow, but doing the opposite of what they're supposed to do. Anyone seen anything like this before? Anyone know of a way to get rebel pixels to stop misbehaving? I've got screen refresh set to every page, and have tried numerous page changes in hopes that the bounce to inverse video at each page change would help, but it hasn't. Many thanks!

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02-09-2017, 08:33 PM	#2
robko Wizard Posts: 2,454 Karma: 5469320 Join Date: Jul 2010 Device: Kobo	That sounds like a manufacturing defect . Something must have gotten crossed somewhere.

02-10-2017, 12:13 PM	#3
frostschutz Linux User Posts: 2,279 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	can you make a few pictures or video of the issue? never seen before what you described. if it was actual inversion and the area could be identified exactly, then it should be possible to work around the issue in software but... for a new device... get a replacement. sometimes a pixel cell burst and then you have a black or white splotch on the screen that never goes away, but it would not invert...