A method of magnifying printed content using a handheld display device having a touch-sensitive screen and a transceiver for sending and receiving digital information. The method comprises the steps of: imaging an area of the substrate containing printed content and generating image data using an optical...http://www.google.com/patents/US8023140?utm_source=gb-gplus-sharePatent US8023140 - Handheld display device for magnifying printed information
