Touch-sensitive device and method for detection of touch

摘要

The present invention relates to a method and a device for detection of position of touch. The device comprises a waveguide, at least one light source, and at least one detector device. The waveguide has a touch-surface with a surface structure defining a pattern that defines active surface areas and passive surface areas. The pattern is distributed such that an object that contacts a first area will cause a different disturbance of light than an object that contacts a second area, and such that correct positions of a plurality of concurrent touches may be detected.

主权项

1. A device comprising a waveguide, at least one light source for emitting first light, and at least one detector device for detecting first light, the waveguide being adapted to guide first light across at least a first part of the waveguide from a first end of the first part towards a second end of the first part, the waveguide having a touch-surface with a physical surface structure within the touch-surface and/or on the touch surface defining a pattern that defines active surface areas and passive surface areas, the physical surface structure being distributed such that for a first area of the touch-surface and a second area of the touch-surface, which second area has an outline that is identical with the outline of the first area, and which second area is displaced along the direction of the first light from the first end to the second end, the physical surface structure distributed within the first area distributed differently from the physical structure distributed within the second area, such that an object that only contacts the entire first area will cause a different disturbance of first light than an object that only contacts the entire second area when first light is guided by the waveguide from the first end towards the second end.