I've been discussing HDR calibration with Bram at FSI, specifically consumer displays...
The big issue is that consumer TVs cannot be accurately HDR calibrated, due to a combination of limited internal CMS capabilities, and the 'burnt-in' EOTF, with roll-off.
But, FSI (Bram) seems to found a bit of an exception...
On LG OLED TVs you can use the service remote to manually force the display into 'HDR On' mode from the service menu.
FSI have only been able to do a short test on the newer LG C7 OLED, but this may work on the 6 series OLEDs as well?
When you do this (at least on the C7) the display goes to its true peak luminance output without requiring HDR metadata over the HDM connection and without triggering a ST2084 EOTF. The upshot of this is that because that HDR metadata is not present the display doesn't apply the PQ EOTF. So you get 700~800 nits output with an EOTF that is much closer to a power curve than it is a PQ type response.
Due to being short on time FSI were not able to do a large profile + 3D LUT calibration, but did do a quick profile (grey only) and exported just a 1D LUT targeting ST2084 clipping at 675 nits. It generated a response pretty close to targeted PQ EOTF with just that very rough test, as follows.
This quick test does suggest there could be a very workable way of using the LG OLED TVs + a BoxIO LUT Box
for HDR/4K calibration... with accurate EOTF and colour calibration.
And further tests by LightSpace CMS user Pepijn Klijs suggests the Panasonic DX900 can be treated the same, as can the Sony Z9D - and it may be true of other TVs too...
Basically, if you can disable the in-built/burnt-in EOTF, but maintain the backlight running in HDR mode brightness mode, then you can use an external LUT Box, such as the BoxIO
, to calibrate the display using LightSpace CMS - to ANY of the HDR standards within LightSpace.
ST2084 (all PQ based HDR standards)
(The only issue I can see with the DX900 is it seems to have a horrendously 'blue' backlight, making the backs appear very blue... The Sony Z9D we have not yet evaluated.)