An interferometric optical device comprendeº means (20; 202) for supporting an optical device; means (200) for modulating interferometrically light comprising a non-active area (108; 230) and an active area, the modulating means (200) arranged on the support means (20; 202), the modulating means (200 ) an optical characteristic which changes in response to a voltage applied to the modulating means, and electrically optical mask conductor (218, 222) coupled electrically to the modulating means (200) to provide one or more electrical paths for application of voltages to the modulating means, the mask (218, 222) a first reflective layer (218) and a second reflective layer (222), the first reflective layer (218) and the second reflective layer (222) comprising configured as an element separate static active area to interferometrically the modulate light such that the mask absorbs light in at least part of the non active area (108; 230) of the modulation means (200).
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