If anyone here has a Lenovo system that is having the "red" tinged display, see the last couple of postigs at the Lenovo forum https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/Display-turns-red-on-X1C6-with-Windows-10-1903/td-p/4439839 The gist of the tips is to look at the Lenovo Vantage App  & look close at the Eye Care Mode.