Fingerprint recognition device and user authentication method for card including the fingerprint recognition device
Provided are a fingerprint recognition device which performs a fingerprint recognition function and can be inserted into a card, the card including the fingerprint recognition device, and a user authentication method for the card including the fingerprint recognition device. The fingerprint recognition device includes a fingerprint touch unit that a fingerprint touches and an image sensor capturing a fingerprint pattern by using a reflected wave reflected from the fingerprint touch unit 310 and comparing a comparison reference fingerprint pattern with the captured fingerprint pattern.
1. A fingerprint recognition device comprising:
a fingerprint touch unit that a fingerprint touches; and
an image sensor for capturing a fingerprint pattern by using a reflected wave reflected from the fingerprint touch unit, and for comparing a comparison reference fingerprint pattern with the captured fingerprint pattern,
wherein the fingerprint touch unit and the image sensor are implemented on different surfaces of a semiconductor substrate, and
wherein the image sensor includes:
a memory for receiving and storing the comparison reference fingerprint pattern;
an image sensing block for converting the reflected wave reflected from the fingerprint touch unit into an electrical signal;
an image sensor circuit for receiving the electrical signal from the image sensing block, and for capturing the fingerprint pattern; and
a signal processing block for determining whether or not the captured fingerprint pattern and the comparison reference fingerprint pattern accord with each other, and for outputting a result of the determination.
2. The device of claim 1 , wherein the fingerprint touch unit is implemented by a surface grinding process in semiconductor manufacturing processes.
3. The device of claim 1 , wherein the memory stores a fingerprint pattern captured by using the image sensing block and the image sensor circuit as the comparison reference fingerprint pattern, or externally receives and stores a fingerprint pattern as the comparison reference fingerprint pattern.
4. The device of claim 1 , wherein the reflected wave reflected from the fingerprint touch unit is generated from a light source emitted in a direction from an upper portion of the fingerprint touch unit or an upper portion of the image sensor toward the fingerprint touch unit.
5. The device of claim 1 , further comprising a light emitting unit.
6. The device of claim 5 , wherein light emitted from the light emitting unit has an infrared frequency.
7. The device of claim 6 , wherein the light emitting unit includes one or more light-emitting diodes.
8. The device of claim 7 , wherein the light emitting unit is implemented in the semiconductor substrate along with the fingerprint touch unit and the image sensor or implemented in the image sensor.