Patent ID: 9383722
Filing Date: 2016-07-05
CPC Classification: G02B,G03H

Claim Text:
1. An optical device comprising: a light source; a light guide plate configured to receive light, and to guide the received light; a first deflecting element configured to deflect light entering the light guide plate; and a second deflecting element configured to deflect light which has been propagated through the light guide plate, wherein an intensity of a first deflected light by the first deflecting element which corresponds to a first view angle +θ is higher than an intensity of a second deflected light by the first deflecting element which corresponds to a second view angle −θ, wherein a number of times of the first deflected light deflected in the second deflecting element is higher than a number of times of the second deflected light deflected in the second deflecting element, and wherein a peak wavelength of the light source is closer to a central diffraction wavelength of the light with the first view angle +θ than to the a central diffraction wavelength of the light with the second view angle −θ, θ being an angle relative to a normal to a surface of the light guide plate.