| 摘要 |
<p>There is disclosed a helmet mountable display system which, in the stereoscopic version, includes separate optical paths for providing respective images to the left and right eyes of an observer for stereoscopic viewing, these paths sharing in common, however, a mechanical scanning arrangement. Each of a first and second plurality of spaced apart, substantially point light sources (14,15) supply a respective group of modulated rays of light. The rays of each group are collimated by a respective input lens (16,18) and the collimated rays from each input lens are directed so that their envelopes all intersect at the same point. A horizontal (27) and a vertical (25) deflecting surface are disposed on opposite sides of the intersection point. Electro-mechanical drivers (26,24) move the surfaces which scan all the collimated rays. The scanned rays from each group are focused onto a respective screen (32,34) by a respective output lens (28,30) to form a raster scanned image. Preferably the screens are divided into a plurality of contiguous zones with a ray from each light source assigned to a corresponding zone, which reduces the vertical scan angle excursions required. Simultaneous scan lines from the rays are displayed in each zone on the screen which reduces the video bandwidth requirement of the system. The image from the screens (32,34) is supplied to the inside surface of a visor from which it is reflected to a corresponding eye of the observer.</p> |
