The screen is edge-lit (lights around the edge of the TV) & companies use 'local dimming' technologies to improve contrast on the dark screen sections that appear between something bright in the center & darkness around it.

Light-bleed' is when dark sections of the screen show a glare, which looks like a flashlight shining across the dark section, really any light bleeding into the wrong places

n’t love him as much as I thought I did ;)