Originally Posted by bongorash
New owner of Kobo Glo here, had it just over a month and whilst on holiday in Tenerife last week noticed this thin line whilst in the sun - not on every page just every few pages - noticed if I went back to a page that had the line on it sometimes disappeared. At first thought it was a problem with the epub but seemed to happen on all books. Back in the UK and no sign of the line so assume it might be a overheat issue ?
It shouldn't happen.
I had a ereader with a SiPix screen and that screen was a lot worse than the pictures shown in this thread. When the temperature of that SiPix screen was 35° C or higher the screen slowly faded to black/dark grey and looked like a badly photocopied page. The page became unreadable.