Virtual image display device

Abstract

A virtual image display device includes a display including a display surface that displays an image, an optical system that projects image light emitted from the display surface to form a virtual image in a field of view of a user, a measurer that measures a background luminance level, and a controller. The controller changes a luminance level of an image to be displayed on the display surface between the background luminance level measured by the measurer and a predetermined luminance level higher than the background luminance level based on gray level-luminance level characteristics of the display.

Dependencies are inferred from the claim text.