Head-up display apparatus

A head-up display apparatus to achieve a visual recognition of a display image as a virtual display image from a viewpoint region by projecting the display image onto a projection face of a display member,

• the apparatus comprising:
• a screen member including an image formation face that forms a display image;
• and
• an optical device arranged separate from the screen member, the optical device including a reflection face, which receives and reflects the display image formed by the image formation face, to project the display image onto the projection face of the display member,
• the screen member and the optical device being arranged in a predetermined three dimensional space having an x axis, a y axis, and a z axis, which mutually intersect orthogonally,
• wherein:
• the image formation face includes a plurality of convex portions and a plurality of concave portions along the x axis and the y axis,
• each of the convex portions and the concave portions having a predetermined first length along the x axis and a predetermined second length along the y axis,
• the convex portions and the concave portions being disposed in a grid array where one convex portion is disposed to alternate with one concave portion along each of the x axis and the y axis,
• a virtual reference face of the image formation face being defined such that the convex portion has a convex face that is convex from the virtual reference face and the concave portion has a concave face that is concave from the virtual reference face;
• and
• the screen member and the optical device are arranged such that a perpendicular line that is perpendicular to any position of the virtual reference face passes through an outside of the reflection face of the optical device.