this is not a fault, it's because the Gemini has an LCD display and their fundamental principle of operation is by using polarised light!
Yes, but the LCD's polarisation has the
wrong orientation.
It's clearly intended for a portrait-style phone, as when held that way up it's perfectly compatible with polarised sunglasses (which are all polarised in the same plane, to cancel out reflections off horizontal surfaces). But it fails big-time when used in landscape orientation, as used in the Gemini (as that's when the display's plane of polarisation is perpendicular to that of the sunglasses, almost completely blocking the screen).
Either the factory economised by reusing a screen originally intended for use in portrait orientation, or they didn't realise the problem. Either way, the plane of polarisation is wrong for the orientation it's intended to be used in.