I was searching for Collins waveguide patents and found this -
The image sources 76 and 78 are micro displays receiving video signals from the merge processors 70 and 72 in some embodiments. The image sources 76 and 78can be liquid crystal displays (LCDs), organic light emitting diode (OLED) displays, liquid crystal on silicon (LCOS), or other device for providing images in response to an electronic signal.
Note patent applied for 2017-01-30 & not granted till 2020-05-05
Rockwell Collins did contend for IVAS. Perhaps their IP wasn't far enough along at the time .
For those that like digging here's a Search on Rockwell Collins waveguide Patents -
Haven't had time to review many yet but this one seems interesting -