| 摘要 |
<p>An interactive display device (100) has an image layer (102) for presenting user perceivable visual content and a touching surface (101) covering the image layer (102) or formed by the image layer (102). Further, there are a plurality of invisible light sources (110) for illuminating alternatingly different sub-regions of the touching surface (101) and a plurality of touch detection units (107) for capturing images of illuminated sub-regions from behind the image layer (102). From the captured images contact areas are detected where a pointing object (112) contacts the touching surface (101) and thus causes correspondingly one or more marks in the captured images. The remaining ones of the invisible light sources (110) are controlled to be operable while adjacent touch detection units and associated invisible light sources are controlled to be non-operable so as to reduce undesired reflections of invisible light from non-contacting objects in the vicinity of the touching surface.</p> |
