The manual (Setup Menu Options / HDMI Options / De-interlacing Mode) has a nice summary of the options and recommends Auto, which is what I use. Note Deinterlacing is required for DVD playback. Some extras on Blu-ray may be interlaced, and some main features like concert videos, but most Blu-ray titles are stored in a progressive format that does not need to be deinterlaced.
Which means this setting is not relevant for most Blu-ray main features. Tip I have DVDs where changing the default deinterlacing mode can improve playback. An example is the 1965 TV series Honey West.
Using Auto deinterlacing, the image often shimmers, shows broken diagonal lines and spectacular moiré on striped shirts. For some reason the way this disc is authored makes it difficult for the player to detect and lock on to the correct cadence. Forcing deinterlacing to Film Bias Mode gives a big improvement in image quality.
Since this setting, like most others, can be made while the title is playing, you can ... more.
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