| 摘要 |
<p>A heads up display presents images to a user. A background is located behind the heads up display. The heads up display is operable to vary the transparency of the images such that images alone are viewable, the background is viewable through the images, or the background is viewable but the images are not. The heads up display may vary the transparency of the images by varying the transparency of a display screen. Alternatively, the heads up display may record the background using a visual recording element and may combine the recorded background with the images such to overlay the images over the recorded background. The, the display screen may display the images. Alternatively, the display screen may be a projection screen upon which an image projector projects the images. The heads up display may also include an illumination element that illuminates the background when not sufficiently illuminated.</p> |
