OLED phones, TVs, and other OLED products do this kind of uniformity correction with factory calibration. On some, the calibration data is stored on Flash or E

OLED phones, TVs, and other OLED products do this kind of uniformity correction with factory calibration. On some, the calibration data is stored on Flash or EEPROM on the panel itself and applied in the Display Driver IC. In others its stored and applied at system level by a Display Controller or SoC. I'm aware of some LCD-based products that do this as well, but I'm not sure if TVs are among them. It's a great way to improve uniformity though, and almost always cheaper than tightening manufacturing tolerances (i.e. decreasing yield).