Patent ID: 8902197

Claim:
A control device for a data processing system and display surface combined therewith, comprising: a display surface; a plurality of one-dimensional optical position detectors that are arranged along the edge of the display surface, each of said optical position detectors generates electrical signals in a manner dependent on absorbed light and is formed by a layered structure composed of an organic material, said optical detectors being equipped with a plurality of tapping points for the signals generated in which the magnitude of the signals at the individual tapping points is dependent on the distance thereof from the partial areas at which the light is absorbed, wherein the distance ratios of the respective tapping points with respect to those partial areas at which the light is absorbed can be calculated from the magnitude ratios between the signals at a plurality of tapping points, wherein the optical position detectors along the edge of the display surface are each constructed as one-dimensional elongate optical waveguides to which more than two photoelectric sensors are fitted, the position of a light spot impinging on the detector surface being deduced from the measured signals of said photoelectric sensors, and at least one layer of each elongate optical waveguide has photoluminescent properties; an optical pointer configured to transmit a pointing beam that has a cross-sectional shape of a plurality of lines, wherein the lines of the pointing beam project onto the display surface and outside a surface area of the display surface to directly impinge the optical position detectors that are arranged along the edge of the display surface; and a data processing system that uses the measured signals of said optical position detectors to calculate the center point of said pointing beam on the display surface.