Patent ID: 7671960

Claim:
A device defining a volume for confining a fluid or sensitive material capable of changing its physical properties, particularly its optical properties, via the application of a voltage, or its electrical properties, via stress or radiation, said device including: at least a first front substrate; and at least a second back substrate maintained at a constant distance from the at least first front substrate, wherein these two substrates are joined by a sealing joint which defines the volume for retaining the sensitive medium or fluid, wherein the sealing joint is formed by a filling channel defined by an inner wall and an outer wall which extend at a distance from each other over the substrate on which said walls are formed, wherein the inner wall defines, via an inner lateral face, the volume for retaining the sensitive medium or fluid, wherein the outer wall surrounds the inner wall, and said filling channel is intended to be filled with a sealing material until the entire volume of said filling channel is occupied, wherein at least one hole communicating with the filling channel and for feeding the sealing material is made in one of the substrates or in the wall.