Near eye display metrology instrument

Abstract

A near eye display metrology device that is compact and will work with longer focal lengths such as those needed for windshield heads-up-display (HUD) and augmented reality heads-up-display (AR-HUD). The device includes an XY galvanometer having a pair of mirrors to controllably deflect an expanded beam traveling along the optical axis in an X dimension and in the Y dimension. An auto-focus assembly is positioned along the optical axis and a controller is coupled to the motors and programmed to correct for any distortions in the device and to control the auto-focus assembly. At least one aperture is positioned along the optical axis and oriented to reduce the measurement field angle of the device and to block any out-of-focus illumination. A spectrograph including a component configured to disperse light onto an imager is used to obtain test results.

Dependencies are inferred from the claim text.