Dolby Vision

No current projector is officially capable of Dolby Vision - Arguably even HDR is a different experience on a projector compared with a high brightness (nits) oled TV.

However this tweak, hack, modification can be very worthwhile and is relatively easy and cost effective

EDID - Extended Display Identification Data - Basically this is a negotiation or contract that happens behind the scenes for display devices. In this case the projector, your player and AV amp. They get together and work out what each device can do and then use that to give you what they think is the best picture and sound.

EDID V1.4 is a *** byte block of data in Hexidecimal pairs eg. 00:FF - Using an EDID editor to create or alter the EDID and device to inject this modified code (spoof) into the chain can alter what a device can do.

LLDV - Low latency Dolby Vision or player led DV - This is a fix so that the player can create metadata for your display rather than the display device creating the meta data which is how normal DV works - See here

Following various threads at AVSforums & AVforums gives lots of examples, advice and masses of information, though there are a fair few conflicting things and a lot to read and distil and not all of it is that useful for the Epson TW9400 which is why i've collected my findings here.

To enable LLDV for the Epson is reasonably easy, simply adding a device that adds a false EDID flag saying the projector works with LLDV - A few additional bits about BT2020, primaries and nits values.

My journey with an original Vertex (not Vertex 2, which is easier to control) is above on the LLDV Tab