Hi Xiaofan:

I have some hand held military radios that have a LCD assembly which is 
slightly larger than a Nickel coin, see: http://www.prc68.com/I/816173.shtml#LCD
there are 5 7-segment characters about 1/8" high.  It uses COB technology and 
has a back light.  I have not found a source for them as spare parts.
http://www.prc68.com/I/816173.shtml#LCD

I've started looking into using a multiplexed glass, which might be lower in 
cost than a custom part but that takes many more PIC pins to drive than the 4 
wire interface for the above COB unit.

-- 
Have Fun,

Brooke Clarke
http://www.prc68.com
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