Semiconductor device comprising a security coating and smartcard provided with such a device
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United States of America Patent
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Jul 6, 2004
Grant Date -
Jun 14, 2001
app pub date -
Dec 6, 2000
filing date -
Dec 9, 1999
priority date (Note) -
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Abstract
A semiconductor device (20) comprising a substrate (1) is provided with a first semiconductor element (3) on a first side (2), of the substrate and with a security coating (14) comprising a matrix, a first filler and a second filler. The second filler is an absorber of radiation of a wavelength of between 800 and 1400 nm and the refractive index of the first filler differs at least 0.3 from that of the matrix. As a result, the security coating inhibits transmission of radiation with a wavelength of between 400 and 1400 nm to a very large extent. The semiconductor device (20) can be incorporated in a smartcard.
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