Wheel driver and portable electronic device having the same

A portable electronic device comprising:

• a pattern wheel driver;
• and
• a microprocessor for displaying information on a display based on a signal received from an encoder,
• wherein the pattern wheel driver comprises:
• a rotatable pattern wheel with patterned regions repeatedly formed on the pattern wheel, each of the patterned regions having a plurality of patterns, wherein each pattern of the plurality of patterns has a different width;
• a detector for detecting the plurality of patterns, the detector mounted at a position where the patterned regions of the pattern wheel pass when the pattern wheel rotates;
• the encoder for producing the signal indicating whether the pattern wheel rotates in a forward direction or a reverse direction based on signals produced by the detector;
• and
• a housing assembly for rotatably mounting the turn dial, wherein the detector is fixed in the housing assembly so that it can detect the patterned regions of the pattern wheel.