[p750mmx]

Edit: @te36, not anymore. You can read my signature to see the (2015) Oled model I have. The 2016 Oled models were also able to display 3D and then LG pulled the plug on that with the newer models. When I made the step to 4k Oled, I did that with my HTPC's also, and so I discovered that the 17 MVC build of Kodi could be used for Hardware Based 3D trough HDMI 1.4 and Full HD 3D on my 4K TV, by using the Interlaced method. I did a comparison some time ago, placed in this topic.

Trying to parse what you say:

Your current (from signature) 2018 panel OLED does NOT support 1.4 HDMI 3D input mode anymore ??

It does support passive 3D line interlaced for 4K signals ?

The 4K passive 3D sounds great, but not-supporting standard 1.4 HDMI 3D input does not make much sense given how all BD DV players only output that format, right ? Is there any commercial BD player that can upsample to the 4K line-interleaved format you use ?

Aka: Why would LG put money into the polarizing layer in the display to then only support a format no commercial DVD player supports...

Surely i am completely confused and misintepret what you meant to say ;-)) 

Lets try this again

Maybe the "with 2018 panel" in my signature is a bit confusing, so let clear this up. I've got a new (in 2018) produced panel in my "old" 2015 model Oled TV regarding Burn-In issues. That panel is still capable of displaying 3D.

A 4k 3D Oled TV support a Hardware based 3D signal from a HTPC with a HDMI 1.4 port, no problem with that.
When using an "all Intel" hardwarebased HTPC with a HDMI 2.0(a) port, the hardware based (MVC) 3D isn't supported (this is related to the on-board lspcon converter, long story). I write "all Intel" because the graphics hardware used is also Intel (iGP), not from Nvidia or AMD.
When using a UHD BluRay player with a HDMI 2.0a port, 3D (MVC) works just fine.

So, in short, both 1.4 and 2.0(a) HDMI ports can be used for displaying 3D on my model TV. Hardware based (HDMI 1.4) and Interlace based (HDMI 2.0x).

Not to confuse you more that I already have I have several (test)systems with other graphics on-board, one with Nvidia graphics (regarding my earlier reaction that 3D works with this Kodi 18 MVC build and Nvidia graphics). My main HTPC is the one in my signature, that one is connected to the Oled 3D TV.