Detector system

A contactless detector system, comprising:

• a waveguide, comprising a transparent base body having a front and a rear;
• a display device that shows multiple selection regions such that they can be seen in a display region of the base body when the front is viewed;
• a sensor device comprising an assigned sensor section for each selection region;
• and
• a control device,
• wherein the base body includes a diffractive element in the display region and a decoupling region that is spaced apart from the display region and comprises an assigned decoupling section for each selection region,
• wherein at least a portion of radiation that is incident on the diffractive element in the display region via the front is deflected via the diffractive element on the basis of the selection region such that the deflected portion propagates as coupled-in radiation in the base body by reflection as far as the decoupling region and is incident on the assigned decoupling section of the decoupling region,
• wherein the decoupling region decouples at least a portion of the coupled-in radiation that is incident on the decoupling region from the base body such that the portion decoupled by a decoupling section is incident on the assigned sensor section of the sensor device, which section continuously measures the intensity of the incident radiation and supplies it to the control device,
• wherein the control device is configured to take a change in intensity caused by an object being positioned contactlessly in front of the front of the base body and in front of a selection region of the display region as a basis for determining whether the selection region has been selected, and
• wherein the control device takes the measured intensity as a basis for ascertaining the distance of the object from the transparent base body.