> the screen isn’t on with static elements for 8 hours I have two old cellphones mounted on the wall in my house that show time, weather, control the thermosta

> the screen isn’t on with static elements for 8 hours I have two old cellphones mounted on the wall in my house that show time, weather, control the thermostat, etc. Most of the display is static. After a couple of years the burn-in is dramatic. I was surprised as I thought only phosphors burned.