A display presenting a three-dimensional visual effect, has (I) a plurality of stacked layers of a display material containing a plurality of pixels which are each independently switchable from a first visual state to a second visual state, each layer having pixels of the same color or combination of...http://www.google.com.hk/patents/US5113272?utm_source=gb-gplus-share專利 US5113272 - Three dimensional semiconductor display using liquid crystal
