Arthur wrote:
Using Polarized sunglasses works for me.
That will depend heavily on the tablet, as well as its orientation. Many LCD displays are themselves polarized, such that when viewed through polarized sunglasses, they look fine in portrait orientation but then go completely black when rotated 90 degrees to landscape, or vice-versa.
My panel-mounted GPS is somehow polarized on a diagonal, so that it's always somewhat dim unless I tilt my head when I look at it, and I used to have a device that was unreadable in the portrait orientation I preferred. Because of those issues, I don't use polarized lenses in my plane.