| 摘要 |
A head up display 100, the display comprising a virtual image generation system 1010 (fig. 1) to generate a virtual image. The virtual image generation system has output optics including a partially reflecting optical surface 22, wherein an optical axis 28 of light exiting from the image generation system is tilted with respect to a normal to the optical surface. This defines a tilt angle of greater than zero degrees between the optical axis and the normal. The optical surface has an angular filter on an output side of the optical surface to attenuate external light 32 reflected 34 from the optical surface at an angleαgreater than a threshold angle to the optical axis. The filter may be a baffle adjacent said optical surface, the baffle comprising an arrangement of tubes extending longitudinally along said optical axis of light exiting the image generation system. |
