公开(公告)号：US11137655B2

公开(公告)日：2021-10-05

申请号：US16839634

申请日：2020-04-03

申请人： Facebook Technologies, LLC

发明人： Maxwell Parsons ,  Shane Colburn ,  Yingfei Jiang ,  Andrew Maimone ,  Erik Shipton ,  Guohua Wei ,  Oleg Yaroshchuk

IPC分类号： G02F1/1335 ,  G02F1/137 ,  G02F1/1343 ,  G02F1/1337 ,  G03H1/22

摘要： A tunable liquid crystal (LC) device includes an LC layer between a pair of reflectors forming an optical cavity. The reflectors include conductive layers for applying an electrical signal to the LC layer. One of the conductive layers may include an array of conductive pixels for spatially selective control of the effective refractive index of the LC layer. The phase delay introduced by the LC layer may be greatly increased or magnified by placing the LC layer into the optical cavity. This enables a substantial reduction of the LC layer thickness, which in its turn enables very tight pitches of the LC pixels, with a reduced inter-pixel crosstalk caused by fringing electric fields, as well as faster switching times. A tight-pitch, fast LC device may be used as a configurable hologram or a spatial light modulator.

公开(公告)号：US20210255490A1

公开(公告)日：2021-08-19

申请号：US16839634

申请日：2020-04-03

申请人： Facebook Technologies, LLC

发明人： Maxwell Parsons ,  Shane Colburn ,  Yingfei Jiang ,  Andrew Maimone ,  Erik Shipton ,  Guohua Wei ,  Oleg Yaroshchuk

IPC分类号： G02F1/137 ,  G02F1/1343 ,  G02F1/1335 ,  G02F1/1337 ,  G03H1/22

摘要： A tunable liquid crystal (LC) device includes an LC layer between a pair of reflectors forming an optical cavity. The reflectors include conductive layers for applying an electrical signal to the LC layer. One of the conductive layers may include an array of conductive pixels for spatially selective control of the effective refractive index of the LC layer. The phase delay introduced by the LC layer may be greatly increased or magnified by placing the LC layer into the optical cavity. This enables a substantial reduction of the LC layer thickness, which in its turn enables very tight pitches of the LC pixels, with a reduced inter-pixel crosstalk caused by fringing electric fields, as well as faster switching times. A tight-pitch, fast LC device may be used as a configurable hologram or a spatial light modulator.