Electro optic display device with porous sub-layer and method
AssigneeU.S. Philips Corporation
InventorsTeunis J. Vink, Willem Walrave
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Abstract
In an LCD internal reflections are reduced by giving the inner side of a metal pattern functioning, for example as a light shield (black matrix) a porous structure. The porous structure is obtained by means of a sputtering process in which the sputtering pressure is increased for providing the porous sub-layer, while the layer is etched and/or oxidized to obtain a satisfactory density.
Claims27
A display device comprising an electro-optical display medium between two support plates, at least one support plate being provided with a metal pattern which is light-reflecting at the side remote from the electro-optical display medium, wherein the metal pattern has a porous sub-layer at least at the side facing the electro-optical display medium, the porous sub-layer being formed by increasing pressure during sputter deposition thereof.
A method of providing a supporting plate with a metal pattern which is light-reflective at the side facing the supporting plate and light-absorbing at the other side, the metal pattern having a porous upper layer, the method comprising depositing the metal by sputtering, and increasing the sputtering pressure during deposition to provide the metal as composite columns that are sufficiently spaced apart as to form the porous upper layer.
Dependencies are inferred from the claim text.