Patent ID: 11893189
Assignee: FLATFROG LABORATORIES AB
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A touch sensing apparatus comprising:
a panel that defines a touch surface extending in a plane having a normal axis,
a plurality of emitters and detectors arranged along a perimeter of the panel, and
a light directing portion arranged adjacent the perimeter and comprising a light directing surface,
wherein the emitters are arranged to emit light and the light directing surface is arranged to receive the light and direct the light across the touch surface,
wherein the panel comprises a rear surface, opposite the touch surface, and the emitters and/or the detectors are arranged in a cavity of a frame element and arranged opposite the rear surface to emit and/or receive light through a channel in a wall portion of the cavity, the channel is arranged opposite the rear surface and extends in a direction of the normal axis,
wherein the light directing surface and the channel are arranged on opposite sides of the panel and overlap in the direction of the plane, and
whereby the light directing surface receives light from the emitters, or directs light to the detectors, through the panel and through the channel, in the direction of the normal axis.