Pancake lens
HMDを薄くできる光学系
2022年以降はパンケーキが主流になるかも？
https://gyazo.com/5f590f17a04a976c655dbe0cdf66a842
Pancake optics, compared to other optics designs, can provide a far superior magnified image quality in a much thinner form factor, especially for products with field of views (FOV) ranging from 50 degrees to 100 degrees. However, previous Pancake optics needed at least one spherical glass lens to avoid image artifacts caused by birefringence of the plastic material, but this glass lens added both weight and cost to the lens system.
Kopin’s new all-plastic Pancake optics with all aspherical lenses (compared to previous Pancake optics using spherical glass lens) substantially reduce the weight and thickness while significantly improving the image quality – all at a lower cost. 光の利用効率が悪い(映像パネルからでる光量の1/4しか活用されない)
明るい液晶を使う
解像感の高い有機ELは暗いのでフレネルレンズか非球面レンズ(高い)をつかう
ローカルディミングでコントラストを上げる
https://youtu.be/dIfyZ1YNKLY?t=8733
このパンケーキとはダブルレンズ
原理