| 摘要 |
<p>A border for a substantially two-dimensional image comprises an anterior pattern (10, 11) and a posterior pattern (6), the patterns being space one from the other and being arranged to form, when viewed together, a resultant apparent pattern in a different plane to that of the image. The patterns each comprise relatively brighter (6, 10) and relatively darker (11) regions, but each usually has a different pitch. The posterior pattern may advantageously comprise an array of reflective dots (6) printed onto a major surface (7) of a light transmissive sheet (5) which may be edge lit by a light source (12). The border brightness can then be independent of ambient light conditions and simple to manufacture.</p> |
