| 摘要 |
A mobile communication device having a keyboard (10) with a set of keys representing alpha-numeric characters (26), the keyboard comprising a light source (42), located within said mobile communication device; for providing a light; a set of sensors (30), associated with said keys, for sensing an amount of said light in a vicinity of each of said set of sensors, to determine which of said set of keys has been selected; and a transparent flat cover, overlying said set of sensors, displaying said set of alpha-numeric characters, for associating said set of alpha-numeric characters with said set of sensors.
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