Patent ID: 9436008
Filing Date: 2016-09-06
CPC Classification: B60K,G02B,G06T

Claim Text:
1. A head-up display device that projects a display image onto a projection surface of a moving entity and thus displays a virtual image of the display image so that the virtual image can be discerned inside the moving entity, comprising: a projector that projects laser light carrying the display image; and a screen member that has a plurality of optical elements arrayed in a form of a grating, and diffuses and introduces the laser light, which emanates from the projector and enters the optical elements, toward the projection surface, wherein the optical elements have curved surfaces, which are either convexly curved or concavely curved and take on a common curved form, as faces of the optical elements, and diffuse the laser light which is emitted to the projection surface from the curved surfaces; and a sag quantity from each of surface vertices of the curved surfaces to each of boundaries among the optical elements differs between adjoining optical elements.