To add to this thread the following are graphs of two different displays that show a direct comparison of issue with image stabilisation and non-linearity - the output of the display is not linear and predictable when the input signal is changed in a linear and predictable way.
Both displays were profiled with NO Stabilisation or Drift, just using Anisometric Patch Sequences to match the random image display under normal operation.
(The graphs are generated with a system we use internally to assess display quality.)
The issues are obvious to spot.
Both displays were profiled to their native gamut and gamma, so are a direct comparison of the display's underlying capabilities.
The CIE graphs are 3D views of the Yxy data, with error vectors.
(The vectors show where each point 'should' be, while the coloured points show that actual measured colour location. The points are colour coded Green, Orange, Red, for dE accuracy.)
In the above 3D CIE graphs the volumetric errors with the WRGB OLED are obvious, with the 'error vectors' showing the inaccuracies measured during the profiling sequence, with the 'vectors' changing direction throughout the profile, with multiple 'input' points also pointing towards the same measured colour point. All very irregular and non-linear.
The LCD display shows few such errors.
The above are 'Normalised Cube' displays of the same data, making it easier to see the issues.
You can see the 'scallop' taken out of the side of the WRGB OLED for example, showing serious inaccuracy compared to the display's native colour space.
And if we add in the Error Vectors, the errors become yet more obvious.
What you need to understand from the above is that a good display would profile to itself near perfectly.
For displays with inherent underlying non-linear inaccuracy, as shown above when a display is profiled to itself (and not directly associated with thermal instability, which requires the use of 'Stabilisation' patches to overcome), a very large profiling sequence will be required, in combination with a very large 3D calibration LUT to overcome the non-linear issues.
WRGB OLED technology will inherently suffer such issues, due to the inclusion of the 'white' pixel, as this will distort the standard RGB colour channel relationship.
Food for thought!