Fingerprint recognizing device having patterned floating electrodes and fabricating method therefor

A method for fabricating a fingerprint recognizing device comprising the steps of:

• forming a transparent insulating layer using a transparent insulating material;
• forming a transparent electrode layer on the transparent insulating layer using a transparent conductive material;
• mixing 25˜35 wt. % dielectric polymer paste, a 25˜29 wt. % retarder, and 30˜50 wt. % dopant-doped luminous powder and then forming a light emitting layer on the top of the transparent electrode layer using the mixture;
• and
• forming a plurality of patterned floating electrodes on the surface of the light emitting layer using a conductive material so that they are spaced at a predetermined interval.

A fingerprint recognizing device, comprising:

• a transparent insulating layer,
• a transparent electrode layer formed over the transparent insulating layer, wherein one terminal of an AC power source may be connected to the transparent electrode layer;
• a light emitting layer formed over the transparent electrode layer and configured to emit light when subjected to an electric field;
• and
• a plurality of patterned floating electrodes arranged over the light emitting layer, wherein when a finger is brought adjacent the plurality of patterned floating electrodes, an electric field is induced between the transparent electrode layer and the plurality of patterned floating electrodes, and wherein the electric field strength is stronger under the individual ones of the plurality of patterned floating electrodes that are located adjacent a fingerprint ridge of the finger.