Title:
広視角を有する電気光学ゲストホスト液晶可変透過フィルタ
Document Type and Number:
Japanese Patent JP6549335
Kind Code:
B2
Abstract:
A variable transmission filter combines in optical series first and second guest-host liquid crystal devices arranged such that one of them is rotated 180° about its normal axis with respect to the other one. The reverse arrangement of the liquid crystal directors of the first and second guest-host liquid crystal devices improves the viewing angle range of the variable transmission filter but, without compensation, introduces a diminution of contrast ratio. A polarization state-changing device positioned between the first and second guest-host liquid crystal devices changes the polarization states of light exiting the first guest-host_liquid crystal device such that transmittance of light in first and second orthogonal polarization states incident on the first guest-host liquid crystal device responds to electric fields applied to the first and second liquid crystal devices and thereby counteracts the diminution of contrast ratio while maintaining the improved viewing angle range.
Inventors:
Jesper Osterman
Terry jay shepherd
Terry jay shepherd
Application Number:
JP2018550704A
Publication Date:
July 24, 2019
Filing Date:
March 06, 2017
Export Citation:
Assignee:
LC-TEC DISPLAYS AB
International Classes:
G02F1/1347; G02F1/13; G02F1/13363; G02F1/1337
Domestic Patent References:
| JP2016534392A |
Attorney, Agent or Firm:
Kenji Sugimura
Mitsutsugu Sugimura
Kimizuka Emi
Mitsutsugu Sugimura
Kimizuka Emi