NOVELTY - The electrochemical device with controlled optical and/or energy properties or photo voltaic device comprises at least one substrate supporting a pile of electroactive layers (3) laid out between a lower electrode and an upper electrode, each comprising at least one electroconducting layer (2) in electrical contact with at least one of current-supply provisions (6), which are positioned outside the zone of substrate covered by the pile of electroactive layers    USE - In devices of electrochromatic type for use as ''intelligent'' windows controlling transmitted light, which can bee mounted on the exterior of buildings, lateral windows of automobile vehicles, trains and aircraft; in devices of photo voltaic type which convert solar energy into electrical energy; in the liquid-crystal display (LCD) devices of type nematic curvilinearly aligned phases (NCAP) and polymer dispersed liquid crystal (PDLC).    ADVANTAGE - Improved control of electrochromatic and photo voltaic window-type devices, and in particular electrical connections which are simple and flexible for industrial implementation.    DETAILED DESCRIPTION - The electroconducting layer (2) of lower electrode is deactivated on one part of at least its periphery, at least in part on a zone of substrate not covered by the pile (3). The covered zone is substantially rectangular and comprises two peripheral deactivated zones (S1,S2), which are obtained by incisions of the electroconducting layer (2) along lines (11,12) traversing the layer. The electroconducting layer of upper electrode and the pile of electroactive layers comprise two deactivated zones (S3,S4) obtained by incisions along lines (13,14). At least one of the electrodes comprises a network of conducting wires/strips laid out in parallel directions. The wires are metallic and laid out on a thermoplastic film. The extremities of wires/strips are electrically connected to the current-supply provisions in the form of flexible bands (6a,6b) of insulating polymer covered on one side with conducting strips (7,8). The pile (3) covers a zone of substrate which is polygonal, rectangular, diamond-shaped, trapezoidal, square, circular, semicircular, oval, or parallelogramic. The device is of electrochromatic system type, all-solid and used in a system of light modulations, liquid crystal, optical valve or photo voltaic. The device is of electrochromatic window type, all-solid and of laminated structure. The device comprises at least one stained glass and/or convex glass. The device comprises at least one of the following coatings: reflecting, infra-red, hydrophilic, hydrophobic, photocatalytic with self-cleaning properties, antireflection and electromagnetic screening. The substrate is rigid, semi rigid, or flexible.    DESCRIPTION OF DRAWING(S) - The drawing is a plan view of the device, the first example.    Conducting layer (2)    Pile of electroactive layers (3)    Network of wires/strips (4)    Current-supply provision (6)    Conducting strips (7,8)    Incisions (11,12,13,14)    Deactivated zones (S1,S2,S3,S4)