As one example, OLED white point can absolutely shift with device or panel temperature. The organic emitters that produce red, green, and blue light each have different
temperature coefficients for luminance and voltage. As the panel heats up, charge mobility in the organic layers increases, which makes
red and green emitters more efficient than
blue. That shifts the combined white point slightly
warmer, usually by about
150–300 K between ~20 °C and ~60 °C. (
See Jeon et al., J. SID 24 (8), 2016; K. Lee et al., SID 2019.)
At the same time, the OLED’s
forward voltage drops by roughly −2 mV/°C per subpixel, and the backplane characteristics also change, altering current balance across colors. Manufacturers compensate for this with temperature-dependent calibration tables in the display driver, but they can’t perfectly correct it in real time.
So in practice:
- Cold panel (~10 °C) → whites can (but not always) appear cooler/bluer, around 7000–7200 K.
- Warm panel (~50 °C) → whites can (but again, not always) appear warmer/yellower, around 6500 K or slightly below.
The shift is small but visible on a white background or when you compare two devices side by side.