| 摘要 |
The invention relates to a display surface and a control device combined therewith for a data processing system, wherein a display surface is equipped with photosensitive elements. A photosensitive element is configured as a planar position detector on the basis of a layer made of an organic photoactive material, which on both sides is connected by a planar electrode, wherein at least one electrode inside the circuit thereof has relatively high resistance, wherein the current through an electrode having poor conductivity is measured at several connecting points disposed at a distance from each other and from this conclusions may be drawn about the position of a local conductive connection through the photosensitive layer caused by light absorption. A luminous indicator produces a light spot on the display surface, the spot is detectable by the position detectors and reported to a data processing unit.
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