An electrically controllable device having scattering which can be varied by liquid crystals (100, 200, 300, 400, 500, 600, 700) comprising a stack of layers in this order: - a first electrode, in particular on a dielectric substrate, first electrode with a first main surface referred to as bonding surface and a surface referred to as opposite surface Sb - a dielectric electroactive layer with a main face referred to as face on the bonding surface side and a main face referred to as opposite face A2, made of a material comprising: - liquid crystals - polymers forming a polymeric network, the liquid crystals being stabilized by the polymeric network - a second electrode with on the side of face A2 a main surface referred to as second bonding surface and with a surface referred to as opposite surface Sc, in particular second electrode on a dielectric support the electroactive layer being visible by transparency on the side of the first electrode and/or on the side of the second electrode, characterized in that the material exhibits, starting from a temperature referred to as T1, a mesophase referred to as P in which the material comprises an assembly of domains, in particular subcentimetric domains, which comprise two-dimensional topological defects, and in that, at a temperature T' greater than or equal to T1, the stack exhibits at least three scattering states for at least one wavelength in the visible region, the first state being the most scattering, the second state being scattering and less scattering than the first state and the third state being transparent or scattering and less scattering than the second state, the three states being switchable, at least two of the three states being obtained by the application of an electric field between the first and second electrodes, the material exhibits another mesophase P' at a temperature of less than T1; the mesophase P is more distant from the crystalline phase than the mesophase P', said domains of the mesophase P are domains remaining from said another mesophase P'. - a first electrode, in particular on a dielectric substrate, first electrode with a first main surface referred to as bonding surface and a surface referred to as opposite surface Sb - a dielectric electroactive layer with a main face referred to as face on the bonding surface side and a main face referred to as opposite face A2, made of a material comprising: - liquid crystals - polymers forming a polymeric network, the liquid crystals being stabilized by the polymeric network - liquid crystals - polymers forming a polymeric network, the liquid crystals being stabilized by the polymeric network - a second electrode with on the side of face A2 a main surface referred to as second bonding surface and with a surface referred to as opposite surface Sc, in particular second electrode on a dielectric support the electroactive layer being visible by transparency on the side of the first electrode and/or on the side of the second electrode, characterized in that the material exhibits, starting from a temperature referred to as T1, a mesophase referred to as P in which the material comprises an assembly of domains, in particular subcentimetric domains, which comprise two-dimensional topological defects, and in that, at a temperature T' greater than or equal to T1, the stack exhibits at least three scattering states for at least one wavelength in the visible region, the first state being the most scattering, the second state being scattering and less scattering than the first state and the third state being transparent or scattering and less scattering than the second state, the three states being switchable, at least two of the three states being obtained by the application of an electric field between the first and second electrodes, the material exhibits another mesophase P' at a temperature of less than T1; the mesophase P is more distant from the crystalline phase than the mesophase P', said domains of the mesophase P are domains remaining from said another mesophase P'. the electroactive layer being visible by transparency on the side of the first electrode and/or on the side of the second electrode, characterized in that the material exhibits, starting from a temperature referred to as T1, a mesophase referred to as P in which the material comprises an assembly of domains, in particular subcentimetric domains, which comprise two-dimensional topological defects, and in that, at a temperature T' greater than or equal to T1, the stack exhibits at least three scattering states for at least one wavelength in the visible region, the first state being the most scattering, the second state being scattering and less scattering than the first state and the third state being transparent or scattering and less scattering than the second state, the three states being switchable, at least two of the three states being obtained by the application of an electric field between the first and second electrodes, the material exhibits another mesophase P' at a temperature of less than T1; the mesophase P is more distant from the crystalline phase than the mesophase P', said domains of the mesophase P are domains remaining from said another mesophase P'.