Screen member and head-up display apparatus

摘要

A head-up display apparatus projects a display image onto a projection surface of a windshield so that a viewer views a virtual image of the display image from an eye box. A screen used in the apparatus is constructed of a plurality of micromirrors. Each micromirror has a convex surface portion being curved to magnify a laser beam toward the eye box. A scanned surface of the screen is provided by an array of the convex surface portions. In a cross section intersecting the scanned surface, adjacent convex surface portions have different curved shapes. Thus, brightness unevenness of the display image caused by interference of laser beams can be reduced while maintaining a simple structure of the screen such as a microlens array.

主权项

1. A screen member having a scanned surface to which a laser beam is scanned to generate a display image on the scanned surface to be viewed from a predetermined viewing space, the screen member comprising
a plurality of optical elements each having a curved surface portion that is curved to magnify a laser beam toward the viewing space, the curved surface portions of the plurality of optical elements being arranged to provide the scanned surface, wherein, in a cross-section intersecting the scanned surface, adjacent curved surface portions have different curved shapes; each of the curved surface portions has a quadrilateral outline when the screen member is viewed in a direction orthogonal to the scanned surface, and the curved surface portions having two or more types of different curved shapes are alternately arranged to provide the scanned surface.