The Samsung Q80B is alright for watching movies in dark rooms. The main downside is that it has a low contrast ratio that makes blacks look gray in dark rooms. Its full-array local dimming feature fails to improve the picture quality in dark scenes, which means there's blooming around bright objects.
I would be almost willing to bet that it was the contrast in combination with edge lit that made you see what you saw. I have seen direct lit TVs and displays with worse clouding/uniformity than many edge lit TVs, but I guess edge lighting requires some extra care during manufacturing so that it can look okay. Mini-LED with Full Array Local Dimming. The latest breakthrough in backlight technology, Mini-LED can create a brighter image with greater contrast and more precise local dimming than traditional LED TVs. QLED Quantum Dot Color. QLED produces purer, richer, more brilliant and accurate colors than a regular LED TV. Full-Array Local Dimming (FALD) backlit LCD will give you a better image than Direct-Lit or Edge-Lit LCD. These may decode DV with the result that is closer to 60-70% of OLED HDR. Direct LED (see below for details). These may decode DV with the result that is closer to 40-50% of OLED HDR; Edge-Lit is what 90% of consumers buy because they are
Higher-end sets use a more advanced type of backlight called full-array with local dimming — FALD for short. Like direct-lit TVs, the backlight covers the whole back of the screen, but FALD sets use a lot more LEDs. They also offer many dimmable zones for wider contrast and more realistic shadow detail than direct- or edge-lit sets.

Full-array local dimming means that zones can be adjusted independently across the display as opposed to edge-lit dimming that can only dim in horizontal bands. Dimming zones reduce backlight intensity in specific areas of the screen to improve the contrast ratio. This is necessary because LCD TVs rely on a backlight to shine through the

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direct led vs full array