Dual-pane thermal window with liquid crystal shade

Abstract From the Canadian patent

A dual-pane thermal window unit comprises two nonintersecting or, preferably, substantially parallel spaced window panes, mounted in a window frame a first, of the panes having affixed thereto a first wall of an electro-optical liquid crystal cell providing a selected light transmittance, and a second of said panes delimiting, with a second wall of said cell a space, providing a thermal break. Each of the first and second walls comprises an electrically conductive film composed of plastic and having sufficient supporting strength to maintain the structural integrity of the cell. The window is light weight, economical to manufacture and efficient and reliable in operation.