Gif of symptoms here.

1.5 year old Aspire V5-591G started having a horizontal line of gray pixels appearing near the top of the screen last Wednesday, at where the address bar of my internet browser is in the gif. A second line then appeared next to it, and sometimes a third one flashes in as well.

On Friday, the part of the screen below the lines (so, like, 95% of the screen basically) started ghosting like you see in the gif. Afterimages whenever I scroll down, or whenever I move the mouse cursor, or whenever there's an animation playing, basically any action happening onscreen. Screen also periodically has a purple tinge slowly fade in, which then disappears after half a minute to reset before the next cycle of fading in. Ruins my eyes to use the laptop now.

If it matters, I mainly use the laptop at my desk and rarely move it around. And I don't have a screensaver, if you're suspecting something like a burn-in. The behavior is already present right at boot even before starting Win10. Tried to investigate by connecting to an external monitor, then a television set. Displayed fine on both. Also, my laptop has the feature of having dual graphics cards (Intel HD Graphics 530 and NVIDIA GeForce GTX 950M), so went to device manager, disabled one while enabling the other, problem persists. Switch to disabling the other graphics card, still no dice. Partly opened the case to wiggle cable out from screen and reseat it multiple times, didn't seem to help.

What other troubleshooting steps should I try? What is the offending component? Much thanks and Merry Christmas!