Composite pane comprising electrically controllable optical properties and control unit

A method for producing a composite pane with electrically controllable optical properties, comprising:

• a) arranging a thermoplastic intermediate layer and a functional element with electrically controllable optical properties between an outer pane and an inner pane,
• b) joining the outer pane and the inner pane via the thermoplastic intermediate layer by lamination,
• c) attaching a securing element for reversibly securing a control unit to a surface of the outer pane or of the inner pane facing away from the thermoplastic intermediate layer, and
• d) arranging a control unit adapted to control the optical properties of the functional element in the securing element,
• wherein the securing element is fixedly connected to the surface of the outer pane or of the inner pane and the control unit is detachably connected to the securing element, and
• wherein when the control unit is arranged in the securing element, the control unit and the functional element are electrically connectable to each other and, when the control unit is detached from the securing element, the control unit and the functional element are electrically disconnectable from each other.