| 摘要 |
This invention relates to the provision of a head-up display system for use in vehicles such as aircraft or land vehicles. A head-up display system superimposes selected visual information on the field of view so that an observer can see not only the view but also the visual information without having to look down at a dial or the like. In the present system there is provided a source of light information signals and means for superimposing an image of the said signals on the field of view of the observer together with means for detecting any angular displacement of the superimposed image with respect to a predetermined position and for producing a control signal proportional to the displacement. Finally there is provided a means responsive to the control signal to adjust the orientation of the light information signals so that the position of the signals in the image viewed by the observer remains more or less constant.
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