The higher density screen might need to require less power but the power to display on them used by the graphics etc is a lot higher. we were on 320x640 screen

The higher density screen might need to require less power but the power to display on them used by the graphics etc is a lot higher. we were on 320x640 screen now we are at 3840 x 2160. Even if the individual pixel takes less power the number of pixel has gone up a huge amount.