Display device (20, 120, 220, 320) for an electrical appliance having: - a UV light source (37, 137, 237, 337) for emitting UV light, - a light housing (23, 123, 223, 323) with an interior cavity (24, 124, 224, 324) therein, wherein the UV light source radiates into the light housing and into the interior cavity, - an opening (26, 126, 226, 326) in the light housing towards a top side, - a cover (29, 129, 229, 329) for the light housing to close the opening with a translucent aperture (31, 131, 231, 331) on the cover, - luminescent material (33, 133, 233, 333) in the light housing or in the interior cavity, which material is distributed over the area and configured such that, upon irradiation with UV light, said material is fluorescent and outputs light for shining through the aperture (31, 131, 231, 331) as an illuminated display corresponding in shape to the aperture, wherein the luminescent material (33, 133, 233, 333) is disposed essentially at a distance to the aperture (31, 131, 231, 331) and/or to the cover (29, 129, 229, 329) in a lower portion or in a rear portion of the light housing (23, 123, 223, 323) and the interior cavity (24, 124, 224, 324) facing away from the UV light source (37, 137, 237, 337), characterized in that - the luminescent material is at least partially in a groove shape having a longitudinal extension along the illuminating direction of the UV light source, wherein a central portion (35, 135, 235a, 235b, 335) of the luminescent material along said longitudinal extension is lower and to the left and to the right adjacent thereto raised side wall portions (24a, 24b, 124a, 124b, 224a, 224b, 324a) are provided, - the luminescent material (33, 133, 233, 333) is increasing with a longitudinal extension away from the UV light source (37, 137, 237, 337), or the distance of the luminescent material to the cover (29, 129, 229, 329) is decreasing with a longitudinal extension away from the UV light source. - a UV light source (37, 137, 237, 337) for emitting UV light, - a light housing (23, 123, 223, 323) with an interior cavity (24, 124, 224, 324) therein, wherein the UV light source radiates into the light housing and into the interior cavity, - an opening (26, 126, 226, 326) in the light housing towards a top side, - a cover (29, 129, 229, 329) for the light housing to close the opening with a translucent aperture (31, 131, 231, 331) on the cover, - luminescent material (33, 133, 233, 333) in the light housing or in the interior cavity, which material is distributed over the area and configured such that, upon irradiation with UV light, said material is fluorescent and outputs light for shining through the aperture (31, 131, 231, 331) as an illuminated display corresponding in shape to the aperture, wherein the luminescent material (33, 133, 233, 333) is disposed essentially at a distance to the aperture (31, 131, 231, 331) and/or to the cover (29, 129, 229, 329) in a lower portion or in a rear portion of the light housing (23, 123, 223, 323) and the interior cavity (24, 124, 224, 324) facing away from the UV light source (37, 137, 237, 337), - the luminescent material is at least partially in a groove shape having a longitudinal extension along the illuminating direction of the UV light source, wherein a central portion (35, 135, 235a, 235b, 335) of the luminescent material along said longitudinal extension is lower and to the left and to the right adjacent thereto raised side wall portions (24a, 24b, 124a, 124b, 224a, 224b, 324a) are provided, - the luminescent material (33, 133, 233, 333) is increasing with a longitudinal extension away from the UV light source (37, 137, 237, 337), or the distance of the luminescent material to the cover (29, 129, 229, 329) is decreasing with a longitudinal extension away from the UV light source.