COMPOSITE FILM, RIGID FLEXIBLE PRINTED CIRCUIT BOARD, AND ELECTRONIC DEVICE INCLUDING SAME
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United States of America
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Apr 3, 2025
app pub date -
Dec 13, 2024
filing date -
Dec 13, 2024
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Abstract
A composite film includes: a base film layer; a first metal thin film layer on a first surface of the base film layer; and a second metal thin film layer on a second surface of the base film layer, opposite to the first surface, wherein the first metal thin film layer and the second metal thin film layer include a soft etching-treated area and at least one oxide surface-treated area, and wherein the soft etching-treated area has a surface roughness that is different from a surface roughness of the at least one oxide surface-treated area.
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