Before the Pixel Tablet 2 was reportedly nixed, Google was eyeing a 120Hz screen upgrade, larger battery, and better cameras ...
A defective pixel on an LCD screen. Bad pixels are often transistors that are permanently dead and appear as black dots or permanently energized and show up as white or colored dots ("hot pixels").
There are plenty of apps you can download which will fix the issue, like Dead Pixels Test and Fix. After the app has finished running its course it should fix the dead pixels. If the app doesn’t fix ...