Display device

Abstract

Abstract PURPOSE:To obtain a display device having high luminance and high contrast by periodically changing the refractive index in the optional part of an optical waveguide constituted of an electrooptic member by electrodes formed to a stripe shape so that propagated light is diffracted. CONSTITUTION:The optical waveguide 1 is formed of the electroptic material of which the refractive index changes when an electric field is impressed thereto, for example, lithium niobate. An electric field is generated in the region where the stripe electrodes 4 and a transparent electrode face each other by the voltage from an electric field control device 6 when the output is produced from said device. The refractive index in then changed by an electrooptic effect between the opposed positions in the optical waveguide 1. Since the electrodes 4 are formed to the stripe shape, the periodic refractive index change is given to the optical waveguide with regard to the advancing direction of propagated light. This change corresponds equivalently to a diffraction grating. Accordingly, the propagated light 7 successively receives the diffraction and emerges and leaks to the outside by failing to make total reflection at the boundary face between the waveguide 1 and clad 3.

Inventors

• 👤 Satoshi Washimi
• 👤 聡 鷲見
• 👤 Toru Oda
• 👤 小田　透

Bibliographic Details