Optical member, display device using the optical member and movable body using the display device

[0039]FIG. 1A and FIG. 1B are diagrams showing by way of example an optical member according to a FIG. 1A is a plan view of the optical member and FIG. 1B is a cross-sectional view along the line A-A in FIG. 1A.

[0040]FIG. 2A and FIG. 2B are diagrams showing by way of example an optical member according to a comparative example. FIG. 2A is a cross-sectional diagram showing by way of example an optical member according to a comparative example and FIG. 2B is a cross-sectional diagram showing by way of example the action when the optical member according to the comparative example is provided on a projection plate.

[0041]First of all, an optical member according to a comparative example will be described.

[0042]As shown in FIG. 2A, a concave section 50a and a plurality of convex ridges 50b are provided on one of the main faces of an optical member 50 presenting a thin plate shape. The optical members 50 (concave section 50a and convex ridges 50b) are formed of transparent or semitransparen

[0074]FIG. 4A and FIG. 4B are diagrams illustrating by way of example an optical member according to a FIG. 4A is a plan view of the optical member and FIG. 4B is a cross-sectional view along the arrows B-B in FIG. 4A.

[0075]As shown in FIG. 4B, an optical layer 12, optical layer 13, and semi-transparent layer 14 are provided on an optical member 10 that presents a thin plate shape.

[0076]A concave section 12a and a plurality of convex ridges 12b are provided on one main face of an optical layer 12.

[0077]Also, as shown in FIG. 4A, a concave section 12a is provided in substantially the middle of the optical member 10. This concave section 12a presents a substantially circular shape in plan view. Also, convex ridges 12b are provided in concentric circular fashion around the concave section 12a. Also, a concave curved surface is provided on the main face of the concave section 12a and convex ridges 12b.

[0078]The concave section 12a presents a surface shape that is the same as the middle p