Patent ID: 8262232
Filing Date: 2012-09-11
Classification: B60K,G02B,G03B

Abstract:
1. A display device comprising: a projection unit configured to emit a light flux including image information; a divergence angle controlling unit configured to control a divergence angle of the light flux emitted from the projection unit to not more than a prescribed angle; and a transparent projection plate configured to reflect the light flux enabling an occupant to visually identify a virtual image locating in the reflection direction, wherein the divergence angle controlling unit includes a transmission unit transmitting the light flux emitted from the projection unit and a light shielding unit shielding part of the light flux, the part of the light flux is shielded by the light shielding unit so that the divergence angle of the light flux is controlled to not more than a prescribed angle, and an angle θd between a direction of the virtual image and a direction in which a double image is viewable, is not more than substantially 1 mrad, the angle θd represented by θd=d·sin 2θ/nL, where a refractive index of the projection plate is n, a thickness is d, a distance from an eye point position of the occupant to a position of the virtual image is L, and an incident angle of the light flux to the projection plate is θ.