Patent ID: 7450814

Claim:
An optical device for a display including tapered waveguides disposed at intervals and a space for forming a light-absorbing region disposed between the waveguides, the tapered waveguide having an inclined face for reflecting and diffusing incident lights, the light-absorbing region being for absorbing external lights and reducing reflection, the light-absorbing region comprising: (a) a first resin layer coated and cured along the inner wall face of the space, the first resin layer being formed of a resin having a refraction index different from the sidewall of the waveguide, preferably a lower refraction index relative to the sidewall of the waveguide, the first resin layer being free of blackish light-absorbing particles; (b) blackish light-absorbing particles filled in the space outside the first resin layer and for absorbing external lights; and (c) a light-absorbing particle holder for fixing the light-absorbing particles.