Both the Haier H100S90FUX and the TCL 75C6KS share the same 4K (3840 x 2160) resolution and identical color output of 1.07 billion colors at 10-bit depth, meaning neither has an edge in raw color volume or color precision. Both also support the full suite of HDR formats — HDR10, HDR10+, Dolby Vision, and HLG — so content compatibility is evenly matched regardless of streaming platform or source. Viewing angles of 178º horizontally and vertically are identical, and both include anti-reflection coating and an ambient light sensor, making them equally well-equipped for varied lighting environments.
The most meaningful differentiators lie in screen size, pixel density, panel technology, and refresh rate. The Haier's 100″ screen dwarfs the TCL's 74.5″ panel, but that size advantage comes at a pixel density cost: 44 ppi versus the TCL's 59 ppi. In practice, this means the TCL will render finer detail and sharper edges at typical viewing distances, while the Haier's lower pixel density may become perceptible on very close-range viewing for a screen that large. The TCL also uses a Mini-LED backlighting layer on top of its QLED LCD panel — a technology that enables more precise local dimming zones, typically resulting in deeper blacks and better contrast compared to the Haier's conventional LED backlit QLED panel. On refresh rate, the Haier holds a 144Hz panel versus the TCL's 120Hz, giving it a tangible edge for fast-motion content and gaming responsiveness.
Overall, the two TVs trade advantages depending on priority. The TCL 75C6KS has the edge in display quality per inch — its higher pixel density and Mini-LED backlighting suggest sharper images and superior contrast control. The Haier H100S90FUX counters with a dramatically larger screen and a higher refresh rate, making it the stronger choice for immersive large-format viewing and motion-sensitive use cases. Users prioritizing picture fidelity and contrast in a standard living room setting will lean toward the TCL; those optimizing for sheer screen presence and smoother motion will favor the Haier.