Touch-sensitive detecting device comprising a sensor and an associated control circuit, - said sensor comprising a layer with at least an interface configured to define a detection area for at least one object in contact with said detection area, a number N of emitters and a number M of receivers coupled with said layer, said N emitters being configured to emit a beam (Pn) of detection signals at a wavelength in said layer and said M receivers being configured to receive at least a detection signal of said beam (Pn) of detection signals emitted by said emitters and configured to generate an output signal, said layer being transparent at the wavelength of said detection signals emitted by said N emitters and configured to define a waveguide for said detection signals; wherein - said emitters and said receivers are arranged alternating with one another along at least two edges of said detection area; - said control circuit configured to associate a subset of M receivers with each of said N emitters, wherein the subset of receivers comprises a plurality of receivers; - said control circuit is configured to actuate said N emitters in a predefined sequence and to activate said subset of M receivers, - said control circuit is also configured to detect for each active emitter of said predefined sequence said output signals of said associated subset of receivers to define a sequence of output signals; - said control circuit comprising a processing unit that is configured to process said sequence of output signals for determining at least a signal representative of said at least one object in contact with said detection area, - said layer is made of a material configured to deform when in contact with said at least one object, said processing unit being configured to process said sequence of output signals for determining the deformation of said at least one interface and for defining the pressure distribution of said at least one object in contact with said detection area, said at least one signal representative of said at least one object comprising said pressure distribution. - said sensor comprising a layer with at least an interface configured to define a detection area for at least one object in contact with said detection area, a number N of emitters and a number M of receivers coupled with said layer, said N emitters being configured to emit a beam (Pn) of detection signals at a wavelength in said layer and said M receivers being configured to receive at least a detection signal of said beam (Pn) of detection signals emitted by said emitters and configured to generate an output signal, said layer being transparent at the wavelength of said detection signals emitted by said N emitters and configured to define a waveguide for said detection signals; wherein - said emitters and said receivers are arranged alternating with one another along at least two edges of said detection area; - said control circuit configured to associate a subset of M receivers with each of said N emitters, wherein the subset of receivers comprises a plurality of receivers; - said control circuit is configured to actuate said N emitters in a predefined sequence and to activate said subset of M receivers, - said control circuit is also configured to detect for each active emitter of said predefined sequence said output signals of said associated subset of receivers to define a sequence of output signals; - said control circuit comprising a processing unit that is configured to process said sequence of output signals for determining at least a signal representative of said at least one object in contact with said detection area, - said layer is made of a material configured to deform when in contact with said at least one object, said processing unit being configured to process said sequence of output signals for determining the deformation of said at least one interface and for defining the pressure distribution of said at least one object in contact with said detection area, said at least one signal representative of said at least one object comprising said pressure distribution.