A viewing angle control device, wherein the viewing angle control device is configured to control a viewing angle over a viewing surface, and the viewing angle control device comprises: a transparent substrate disposed over and covering the viewing surface; and at least one light source (301, 302) each facing a side surface (201a, 201b) of the transparent substrate and configured to emit a light into the transparent substrate from the side surface (201a, 201b) of the transparent substrate upon being turned on; wherein: the transparent substrate is provided with a plurality of dots, configured to scatter the light from each of the at least one light source (301, 302) such that the viewing angle over the viewing surface is switched by turning on or off the each of the at least one light source (301, 302); wherein the transparent substrate comprises at least one first region, wherein: each first region corresponds to the at least one light source (301, 302), and is at a side opposing to a side surface (201a, 201b) facing the at least one light source, wherein: a first subset of the plurality of dots are arranged in the each first region, and are configured to scatter a light from the at least one light source (301, 302) such that a scattered light emits out from the each first region to thereby interfere with side viewing from the side opposing to the side surface (201a, 201b) facing the at least one light source; characterised in that the transparent substrate further comprises a second region, surrounded by the at least one first region, wherein: a second subset of the plurality of dots are arranged in the second region, and are configured to have a lower density than the first subset of the plurality of dots in the each first region. a transparent substrate disposed over and covering the viewing surface; and at least one light source (301, 302) each facing a side surface (201a, 201b) of the transparent substrate and configured to emit a light into the transparent substrate from the side surface (201a, 201b) of the transparent substrate upon being turned on; wherein: the transparent substrate is provided with a plurality of dots, configured to scatter the light from each of the at least one light source (301, 302) such that the viewing angle over the viewing surface is switched by turning on or off the each of the at least one light source (301, 302); wherein the transparent substrate comprises at least one first region, wherein: each first region corresponds to the at least one light source (301, 302), and is at a side opposing to a side surface (201a, 201b) facing the at least one light source, wherein: a first subset of the plurality of dots are arranged in the each first region, and are configured to scatter a light from the at least one light source (301, 302) such that a scattered light emits out from the each first region to thereby interfere with side viewing from the side opposing to the side surface (201a, 201b) facing the at least one light source; characterised in that the transparent substrate further comprises a second region, surrounded by the at least one first region, wherein: a second subset of the plurality of dots are arranged in the second region, and are configured to have a lower density than the first subset of the plurality of dots in the each first region. a first subset of the plurality of dots are arranged in the each first region, and are configured to scatter a light from the at least one light source (301, 302) such that a scattered light emits out from the each first region to thereby interfere with side viewing from the side opposing to the side surface (201a, 201b) facing the at least one light source; characterised in that the transparent substrate further comprises a second region, surrounded by the at least one first region, wherein: a second subset of the plurality of dots are arranged in the second region, and are configured to have a lower density than the first subset of the plurality of dots in the each first region.