Flexible EL dome sheet and flexible EL dome sheet keypad using the same
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United States of America Patent
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Aug 12, 2008
Grant Date -
Sep 27, 2007
app pub date -
Mar 14, 2005
filing date -
May 3, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A flexible EL dome sheet uses a polymer insulation layer having a thickness of 5 to 50 .mu.m as a substrate, and therefore, the thickness of the flexible EL dome sheet is 50 to 150 .mu.m. The flexible EL dome sheet comprises a flexible EL sheet having key patterns formed thereon and metal or poly domes attached to the EL sheet. Since the flexible EL sheet and the metal or poly domes are used, the flexible EL dome sheet has excellent flexibility and durability, and an additional process for silicon molding is not necessary. Furthermore, the tactile feel of the flexible EL dome sheet keypad is improved. Electric connection between an EL driver of a flexible printed circuit board and the flexible EL sheet is achieved using a contact pad terminal structure, whereby no additional connector is necessary, and therefore, an FPC connecting process is not required.
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