Update August 24, 2020.
The Apple TV app was finally made available on my 2018 LG E8 OLED which now as over 8,600 hours on it. (No trace of burn in after 18 months.) I wanted to retest to see if the grid pattern discussed in the above posts would still be there. That’s an affirmative, see below 7 screen shots. Then to check if the pattern was unique to The Wizard Of Oz, we took several SS’s of Mama Mia! Here We Go Again, a delightful musical based on ABBA music. Production values and color are excellent. The pattern is there as well, so I conclude we are seeing the pixel pattern on the OLED screen. The pattern is only visible on well focused photos.
Both movies are in native 4K with Dolby Vision HDR and Dolby Atmos object based sound. Both movie were streamed from Apple TV which has an average bit rate of 41 mbps. The shots were taken by a Sony A6300, this time in full auto, with tripod. FL 16 mm, SS 1/160, CWB. The LG E8 was tested having 98% DCI P3 color gamut.
EDIT: No freeze frame used.
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