Wikipedia:Reference desk/Archives/Computing/2021 August 23

= August 23 =

Screen Fades to Black on Rotating
I don't know if the Computing Reference Desk is the right place to ask, or whether this should go to the Entertainment Reference Desk, because it has to do with a feature of a cell phone that isn't computing. My guess is that I am in the right place about a phone that becomes confused. I have a Samsung J7, running Android 8.1.0. I have been trying to take pictures outdoors. One thing that I have tried to do is to rotate the phone so as to get a landscape view rather than a portrait view. It takes the pictures normally with the rear camera when I am viewing in portrait mode. However, sometimes, not always, if I rotate the phone so as to take a landscape picture, the screen fades to black, and remains faded to black until I rotate it back to a portrait view. Is this a problem that anyone else has encountered? Does it have a name or diagnosis? Should I ask somewhere else? Robert McClenon (talk) 01:16, 23 August 2021 (UTC)


 * Stupid Question : Does this only happen when you're wearing sunglasses? (If so, they're Polarized_sunglasses. LCD screens also have a polarizing filter.  If the two are rotated 90 degrees out of alignment, you won't be able to see the screen through the lens.)  ApLundell (talk) 23:24, 23 August 2021 (UTC)
 * Yes. McClenon mobile (talk) 23:12, 24 August 2021 (UTC)
 * Our articles Samsung Galaxy J7, Samsung Galaxy J7 (2016), Samsung Galaxy J7 (2017) suggests these all use Super AMOLED screens. I wouldn't completely rule out some variant with an LCD since Samsung is known for producing myriad variants for different regions and two of those articles have very limited details. But, and the reason I checked is that, Samsung phones often use AMOLED screens as a major panel manufacturer. (Samsung ?was [//www.reuters.com/article/us-samsung-display-lcd/samsung-display-to-end-all-lcd-production-by-end-2020-idUSKBN21I0BY] also making LCD panels for phones at the time but they have been prioritising AMOLED for phones for a while now.) Nil Einne (talk) 04:40, 24 August 2021 (UTC)
 * I had no idea that my prescription sunglasses would be polarizing, but they obviously are. (I thought of writing that they clearly are, but that would be a bad pun, because the problem is a lack of directional clarity.)  Thank you, User:ApLundell.  So the screen itself was not fading to black, but my view of the screen was fading to black.  I would not have expected that, but it makes sense.  So the answer is to take off the sunglasses, and either look at the view without glasses or put on indoor glasses to look at the view.  Or I could rotate my head to view the screen, but that just seems too weird, but the whole problem is weird.  Well, well.  Robert McClenon (talk) 01:59, 25 August 2021 (UTC)