Abstract: The present invention relates to a window (2) or a door, comprising: ?(a) a frame or casing; ?(b) at least one sash (3) formed of portions of a hollow-chamber profiled element (4); ?(c) a planar element (11), which is accommodated in the sash (3), the planar element comprising a functional element (13), the light transmission properties of which can be varied at least in some regions when a voltage is applied; and ?(d) a control element (12; 12?), which is designed to control the functional element (11); wherein according to the invention the window or the door is characterized in that the control element (12; 12?) is of a multi-part design and at least one constituent part (12) of the control element (12; 12?) is at least partly accommodated in a hollow chamber (5) of the sash (3). The present invention also relates to a building wall (100) having at least one opening in which a window (2) or door of this type is accommodated.

Abstract: The present invention relates to a window (2) or a door, comprising: ?(a) a frame or casing; ?(b) at least one sash (3) formed of portions of a hollow-chamber profiled element (4); ?(c) a planar element (11), which is accommodated in the sash (3), the planar element comprising a functional element (13), the light transmission properties of which can be varied at least in some regions when a voltage is applied; and ?(d) a control element (12; 12?), which is designed to control the functional element (11); wherein according to the invention the window or the door is characterized in that the control element (12; 12?) is of a multi-part design and at least one constituent part (12) of the control element (12; 12?) is at least partly accommodated in a hollow chamber (5) of the sash (3). The present invention also relates to a building wall (100) having at least one opening in which a window (2) or door of this type is accommodated.