| 摘要 |
<p>A miniature visual display has an optical lens system with at least two separate lens elements (3, 5) positioned to admit a scanning mirror (4) between them. The scanning mirror (4) is driven with an oscillatory motion causing an image of a light source (1) which is reflected in the mirror to appear to sweep across the field of view of an observer looking into the system. The light source (1) is typically a linear array of light-emitting diodes, and the diodes are controlled to emit light flashes in synchronism with the scanning mirror oscillation frequency to generate a virtual raster image. The two lens elements (3, 5) are selected and arranged so that the magnification power of the system is split between the lenses. A viewer looking into the system sees a virtual image apparently positioned at a comfortable viewing distance which is in uniform focus over the entire viewing area.</p> |
