A liquid crystal image displaying/reading apparatus includes a first transparent substrate; a second transparent substrate placed in parallel with the first transparent substrate with a fixed space therebetween; a set of display electrodes formed on the first transparent substrate and the second...http://www.google.com.tw/patents/US5767936?utm_source=gb-gplus-share專利 US5767936 - Liquid crystal image displaying/reading apparatus having an L shape image reading element in a gap between display pixels 
