Lighting device with light guide and surface coating with increasing light transmission

A lighting device for backlighting a trim element in an interior of a vehicle, the lighting device comprising:

• a flat light guide for guiding light extending in a z-direction, the flat light guide having a thickness, a back, a front and circumferential narrow sides, with scattering particles being provided inside of the flat light guide;
• a reflector arranged on the back of the flat light guide;
• at least one light source that is optically connected to one of the narrow sides of the flat light guide for coupling light;
• a surface coating which has a light transmission in the z-direction which increases to the extent that a curve of the light intensity of the at least one light source decreases;
• and
• a carrier foil provided between the surface coating and the flat light guide, the surface coating being applied to the carrier foil,
• wherein the flat light guide is formed by cohesive back-injection of the carrier foil with the surface coating and the flat light guide forms a cohesive bond of the reflector and the surface coating or of the reflector and the carrier foil with the surface coating.