Optical switch and display unit

Details Optical switch and display unit Optical switch and display unit

2006-06-27

2006-06-27

Kim, Ellen E. (Department: 2874)

Optical waveguides

With optical coupler

Switch

C385S901000, C349S193000

Reexamination Certificate

active

07068875

ABSTRACT:
The present invention provides an optical switch for making part of incident light, which has been made incident on an optical waveguide, selectively emergent to a light emergence portion provided outside the optical waveguide. The optical switch includes a liquid crystal device for selective emergence of the incident light. An arbitrary layer of the liquid crystal device is set such that letting Δn be a difference between a refractive index noof the optical waveguide and a refractive index n1of the arbitrary layer of the liquid crystal device, “d” be a thickness of the arbitrary layer, and λ be a wavelength of the incident light, the values of Δn, “d”, and λ satisfy a condition of 2.20×10−3≦|Δn·d·λ−1|≦3.03×10−3. With this optical switch, the uniformity of a light emergence efficiency can be easily realized by making use of a small change region in which the light emergence efficiency is not largely varied. The present invention also provides a display unit using the optical switches.

REFERENCES:
patent: 6754408 (2004-06-01), Toda et al.
patent: 6895138 (2005-05-01), Toda et al.

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