| 摘要 |
A sign board for displaying an image so that the image can be viewed from various viewing angles without appearing distorted is disclosed. The sign board includes a first layer of material having light transmitting portions and light blocking portions arranged over a second layer of material bearing multiple distorted copies of the image. The copies are distorted by being compressed near their edges. The first layer is arranged over the second layer so that the image is visible to a viewer through the light transmitting portions substantially idependently of the angle at which the sign board is viewed.
|
