Patent ID: 8031357

Claim:
A handheld display device for displaying and interacting with information corresponding to at least part of a printed substrate, said device comprising: an optical sensor for imaging an area of the printed substrate containing printed content and for generating image data; a processor for determining interaction data using the image data, said interaction data identifying a page description corresponding to the printed substrate; a transceiver for: sending the interaction data to a computer system, thereby causing the computer system to identify the page description and retrieve display data corresponding to at least some of the printed content using the identified page description; and receiving the display data from the computer system; and an opaque touch-sensitive screen for displaying display information based on said display data, said opaque touch-sensitive screen enabling user interaction with the display information, wherein, from a user's perspective, the opaque screen has real-time virtual transparency through the opaque screen to the printed content underlying said screen to provide a virtual window to the printed content underlying said screen.