Patent ID: 11921313
Assignee: PREH HOLDING, LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  B  H | IPC F  G

Claim 0:
1. A function display for selectively displaying symbols representing switching functions and/or switching states, in particular for a motor vehicle, comprising:
a light guide stack of at least two transparent or translucent, planar light guides arranged in an overlaid manner in a stacking direction, which are arranged so as to be spaced apart by a transparent or translucent layer including a material that is optically thinner compared to the planar light guides so that the planar light guides each have as a display surface a main surface (H) facing towards an observer and, in at least one planar light guide, the main surface (H′) facing away from the observer faces towards an adjacent light guide of the planar light guides which is most closely adjacent in a stacking direction;
at least one light source per light guide of the planar light guides, which is arranged so as to couple a light into a respective light guide via a light entrance region arranged in each case on one end face of end faces of the respective light guide;
wherein each light guide of the light guide stack has at least one of: a light-refractive microstructured portion and a light-scattering microstructured portion, which is provided in or on the light guide and which is configured, if the light source is activated, to display to the observer, in each case by means of the light coupled into the light guide, a backlit symbol in a manner visible through a cover layer; and
wherein each light guide forms at least one edge formed adjacent to or in remaining end faces next to the one end face having the light entrance region; and further an opaque layer, which covers the respective at least one edge and which is applied to the respective light guide, wherein the opaque layer extends on both sides from the remaining end faces across the respective edge and across the respectively adjacent at least one of: the main surface facing towards the observer and the main surface facing away from the observer of the respective light guide up to the display surface thereof.