It's generally agreed that modern screens last between five to seven years, but this is an average across all types of screens. We're no longer just looking at LCD or OLED, but have to consider other panel types. If you watch a lot of TV, every day, consider turning down the brightness to avoid any burn-in or LEDs burning out. One aspect of modern screens is that we have to consider how the panels are built. For instance, RTings, which ran a massive test on TV durability from all angles, found that edge-lit TVs failed more often than other TV types being stress tested.