Vertical digital signage products should also have their polarization filter flipped 90° so you can view them with polarized sunglasses, adding another SKU and cost.

Stockholms Länstrafik didn't figure this out so all our timetable displays are pitch black when viewed with polarized sunglasses.

I've noticed that all but iPhones exhibit this behavior at some angle too and they're apparently using "circular polarization" (expensive) which is another one of these "we do it better" things nobody knows about from Apple (or displays in general)

(https://claude.ai/share/e462247c-0ecd-4a07-8ec1-36a4f3c86597)