Invention Application
- Patent Title: GRATING-BASED LIGHT MODULATION EMPLOYING A LIQUID CRYSTAL
- Patent Title (中): 使用基于光泽度的液晶调制
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Application No.: US14892556Application Date: 2013-06-20
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Publication No.: US20160091775A1Publication Date: 2016-03-31
- Inventor: Gary Gibson , David A. Fattal
- Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
- International Application: PCT/US2013/046873 WO 20130620
- Main IPC: G02F1/313
- IPC: G02F1/313 ; G02B27/22 ; F21V8/00

Abstract:
A light modulator includes a light guide to guide light by total internal reflection, a diffraction grating at a surface of the light guide, and a liquid crystal in contact with the diffraction grating. The liquid crystal has a first state with a first refractive index that substantially matches a refractive index of a material of the diffraction grating to defeat the diffractive coupling. The liquid crystal has a second state with a second refractive index that differs from the first refractive index to facilitate the diffractive coupling.
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