Multitouch-screen for identifying blobs, has liquid crystal-screen plane, on which user of multitouch-screen generates blobs by touching liquid crystal-screen plane, which are identified and evaluated by evaluation unit

摘要

The multitouch-screen (10) has a liquid crystal-screen plane (12), on which a user of the multitouch-screen generates blobs (25) by touching the liquid crystal-screen plane, which are identified and evaluated by an evaluation unit (24). The liquid crystal-screen plane is designed with an infra red light-scattering layer (26) on its side (12b) turned away from the user. The evaluation unit is designed with an infra red light-camera (20) for identifying a brightness differentiation on the infra red light-scattering layer.