Proximity sensor arrangement comprising an optical sensor arrangement comprising - an emitting device and a detection device configured to emit and detect electromagnetic radiation, respectively, wherein the detection device is configured to detect infrared radiation and to detect visible light and wherein the detection device is configured to detect electromagnetic radiation being emitted by the emitting device and reflected by an object in a vicinity of the optical sensor arrangement; - a cover being transparent or translucent for visible light and arranged to cover the emitting device and the detection device, the cover comprising an inner surface facing the emitting device and the detection device; - a first cover layer partially covering the inner surface and having two openings, a first opening located above the emitting device and a second opening located above the detection device, such that an imaginary projection of the first and the second opening along a normal to the first cover layer covers at least partially the emitting device E and the detection device D, respectively, and such that at areas given by the first and the second openings, the first cover layer does not cover the inner surface; - a second cover layer covering the inner surface at the area of the first opening; and - a third cover layer covering the inner surface at the area of the second opening; wherein a reflection and/or absorption characteristics for incident light within a specified spectrum of visible light of one of the second and the third cover layer (C2, C3) is adapted to a reflection and/or absorption characteristics of the first cover layer for incident light within the specified spectrum to reduce a visibility of one of the first and the second opening, such that the optical sensor arrangement appears to the human eye as if it has only one opening or aperture; wherein: - the first cover layer comprises, on a side facing the emitting device and the detection device, an absorptive layer having an average absorptance being greater than or equal to a specified first absorptance threshold value for light within an emission spectrum of the emitting device, and - the first cover layer comprises, on a side facing the cover, a reflective layer having an average reflectance being greater than or equal to a specified first reflectance threshold value for incident light within the specified spectrum, - the second cover layer is implemented as a filter layer passing light within the emission spectrum and blocking light within the specified spectrum, - the third cover layer is implemented as a filter layer passing light within the emission spectrum and blocking light within the specified spectrum. - an emitting device and a detection device configured to emit and detect electromagnetic radiation, respectively, wherein the detection device is configured to detect infrared radiation and to detect visible light and wherein the detection device is configured to detect electromagnetic radiation being emitted by the emitting device and reflected by an object in a vicinity of the optical sensor arrangement; - a cover being transparent or translucent for visible light and arranged to cover the emitting device and the detection device, the cover comprising an inner surface facing the emitting device and the detection device; - a first cover layer partially covering the inner surface and having two openings, a first opening located above the emitting device and a second opening located above the detection device, such that an imaginary projection of the first and the second opening along a normal to the first cover layer covers at least partially the emitting device E and the detection device D, respectively, and such that at areas given by the first and the second openings, the first cover layer does not cover the inner surface; - a second cover layer covering the inner surface at the area of the first opening; and - a third cover layer covering the inner surface at the area of the second opening; wherein a reflection and/or absorption characteristics for incident light within a specified spectrum of visible light of one of the second and the third cover layer (C2, C3) is adapted to a reflection and/or absorption characteristics of the first cover layer for incident light within the specified spectrum to reduce a visibility of one of the first and the second opening, such that the optical sensor arrangement appears to the human eye as if it has only one opening or aperture; wherein: - the first cover layer comprises, on a side facing the emitting device and the detection device, an absorptive layer having an average absorptance being greater than or equal to a specified first absorptance threshold value for light within an emission spectrum of the emitting device, and - the first cover layer comprises, on a side facing the cover, a reflective layer having an average reflectance being greater than or equal to a specified first reflectance threshold value for incident light within the specified spectrum, - the second cover layer is implemented as a filter layer passing light within the emission spectrum and blocking light within the specified spectrum, - the third cover layer is implemented as a filter layer passing light within the emission spectrum and blocking light within the specified spectrum.