Microsoft Patent-OPTICAL DEVICE TO IMPROVE IMAGE UNIFORMITY

for AR/MR i.e. Hololens, describes a diffractive waveguide for image uniformity. The discussion of microdisplays seems to dismiss the family of Liquid Crystal displays which require backlights and high optical energy densities. I'm probably just biased, that's the way it reads to me. We see a lot of this language in these apps and patents but it is invariably there in descriptions of head worn devices. Because we know Size, Weight and Power are key to the acceptance of mobile devices from people jumping out of planes to people wearing a head mounted device in more mundane surroundings, Ikea, Lowes, translating a sign, playing a game.

https://patentscope.wipo.int/search/en/detail.jsf?docId=US223783535&recNum=1&maxRec=52&office=&prevFilter=&sortOption=Pub+Date+Desc&queryString=Microsoft+eMagin&tab=PCTDescription