The same default render resolution as the Vive Pro seems to indicate Index uses the same 1440×1600 OLED panels as the Vive Pro. Back when Index was first leaked a source told us the headset would have “Vive Pro resolution”- but it was unclear whether they referred to panel resolution or angular. Perhaps it was the former.
However the other possibility is that Index’s render resolution is 1.0x instead of 1.4x. The original leaks of Index showed labels on the headset. One of these labels had a heading called “Display” with two options: BOE and JDI.
BOE and JDI are both display manufacturers. BOE makes the 1440p LCD for the Oculus Go also used on Rift S, and JDI is rumored to be making the 2160×2160 LCDs for the HP Reverb
Both companies have 2K LCD panels for VR releasing this year that could be suitable for Index if the headset will indeed improve resolution. BOE has a 90Hz 2160×2376 panel. JDI has a 2160×2432 120Hz panel.
Both panel resolutions are suspiciously similar to the 2016×2240 default render resolution suggested by the Zulubo video.