How to control sun glare off 11" screen

While driving near sundown in my Prime Advanced, headed east or southeast, the low sun can shine in through the right rear window, past the front-right-seat headrest, to produce blinding glare into the driver's eyes off the glass of the 11" screen. Not only is the screen not readable, the glare blinds the driver.
I have wondered about a glare-reducing plastic or glass overlay for the screen, or noticed that an "earflap" attachment to the front-right headrest could block the sun from reaching the screen. Has anyone found the product or method to solve this problem?