Patent ID: 8064092

Claim:
A system for retrieving display data, said system comprising: (A) a handheld display device for overlaying 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 server and receiving the display data from the server; and an opaque touch-sensitive display screen for displaying display-information based on said display data, said touch-sensitive screen enabling user interaction with the display-information; and (B) a server configured for: receiving the interaction data from the handheld display device; identifying the page description corresponding to the interaction data; retrieving the display data using the identified page description, said display data corresponding to at least some of the printed content imaged by the device; and sending the display data to the handheld display device, thereby causing the device to display the display-information on said opaque touch-sensitive display screen, wherein said display information matches and aligns with the printed content underlying said opaque display screen, such that the opaque display screen has real-time virtual transparency through the screen to the printed content underlying said screen from a user's perspective to provide a virtual window to the printed content underlying said screen.