Functional device integrated into a traversible surface and method for producing a traversable surface with same

A functional device, in particular integrable into a trafficable pavement, comprising successively:

• a first protective film, arranged on the front face of the device, made of a first material,
• a first external encapsulation film, made of a second material,
• an internal encapsulation film, made of a third material,
• a second external encapsulation film, made of a fourth material,
• a second protective film arranged on the rear face of the device, made of a fifth material,
• one of the films, among the first external encapsulation film, the internal encapsulation film and the second external encapsulation film, coating active elements,
• the first material, the second material, the third material, the fourth material and the fifth material having Young's moduli E1, E2, E3, E4 and E5, respectively, and coefficients of thermal expansion CTE1, CTE2, CTE3, CTE4 and CTE5, respectively,
• E1 and E5 being similar or identical, E2 and E4 being similar or identical,
• E1>E2 and E4<E5,
• CTE1 and CTE5 being similar or identical, CTE2 and CTE4 being similar or identical,
• CTE1<CTE2 and CTE4>CTE5.