Display device having fingerprint sensing function and method of operating the same
A display device includes: a display unit configured to display an image; a fingerprint sensing unit on one surface of the display unit and comprising fingerprint sensing pixels configured to sense a fingerprint; and a readout circuit configured to receive a fingerprint sensing signal from the fingerprint sensing pixels, wherein the readout circuit is configured to generate and output a normal fingerprint image and a dry fingerprint image, which correspond to the fingerprint sensing signal, during a fingerprint registration mode.
1. A display device comprising:
a display unit configured to display an image;
a fingerprint sensing unit on one surface of the display unit and comprising fingerprint sensing pixels configured to sense a fingerprint; and
a readout circuit configured to receive a fingerprint sensing signal from the fingerprint sensing pixels, wherein the readout circuit is configured to generate and output a normal fingerprint image and a dry fingerprint image, which correspond to the fingerprint sensing signal, during a fingerprint registration mode,
wherein the readout circuit is configured to output the normal fingerprint image and the dry fingerprint image based on a matching score of the dry fingerprint image and the normal fingerprint image.
2. The display device of claim 1 , wherein the readout circuit is configured to generate the dry fingerprint image corresponding to the fingerprint sensing signal and to output the dry fingerprint image in response to the matching score of the dry fingerprint image and the normal fingerprint image being greater than a reference score.
3. The display device of claim 1 , wherein the readout circuit further comprises a memory configured to store instructions that, when executed by a processor, cause the processor to generate the dry fingerprint image corresponding to the fingerprint sensing signal, and the readout circuit is configured to calculate a matching score indicating a match degree of the dry fingerprint image and the normal fingerprint image.
4. The display device of claim 1 , wherein the readout circuit is configured to output a fingerprint template comprising a normal fingerprint template corresponding to the normal fingerprint image and a dry fingerprint template corresponding to the dry fingerprint image.
5. The display device of claim 4 , wherein the fingerprint template comprises a plurality of normal fingerprint templates and a plurality of dry fingerprint templates.
6. The display device of claim 4 , wherein the readout circuit is configured to generate a fingerprint image corresponding to the fingerprint sensing signal during a fingerprint authentication mode and to compare the generated fingerprint image with the fingerprint template.
7. The display device of claim 4 , wherein the readout circuit is configured to generate the dry fingerprint image corresponding to the fingerprint sensing signal during a fingerprint authentication mode, to convert the dry fingerprint image to the normal fingerprint image, and to compare the normal fingerprint image with the fingerprint template.
8. The display device of claim 4 , wherein the readout circuit further comprises a memory configured to store the fingerprint template.
9. The display device of claim 1 , wherein the display unit comprises a display area at which light emitting pixels are arranged and a non-display area adjacent to the display area, and the fingerprint sensing pixels of the fingerprint sensing unit are in a fingerprint sensing area corresponding to the display area.
10. The display device of claim 1 , wherein each of the fingerprint sensing pixels is connected to a corresponding fingerprint scan line among a plurality of fingerprint scan lines and a corresponding fingerprint sensing line among a plurality of fingerprint sensing lines, and the fingerprint sensing unit further comprises a fingerprint scan driving circuit configured to sequentially drive the fingerprint scan lines.
11. The display device of claim 10 , wherein the readout circuit is configured to receive the fingerprint sensing signal from the fingerprint sensing lines.
12. A method of operating a display device in a fingerprint registration mode and a fingerprint authentication mode, the method comprising:
identifying the display device is in the fingerprint registration mode;
receiving a fingerprint sensing signal;
generating a normal fingerprint image corresponding to the fingerprint sensing signal;
generating a dry fingerprint image corresponding to the fingerprint sensing signal; and
outputting the normal fingerprint image and the dry fingerprint image based on a matching score of the normal fingerprint image and the dry fingerprint image.
13. The method of claim 12 , wherein the outputting of the normal fingerprint image and the dry fingerprint image comprises outputting the normal fingerprint image and the dry fingerprint image in response to the normal fingerprint image matching with the dry fingerprint image.
14. The method of claim 12 , wherein the outputting of the normal fingerprint image and the dry fingerprint image comprises outputting the normal fingerprint image and the dry fingerprint image in response to the matching score of the normal fingerprint image and the dry fingerprint image being greater than a reference score.
15. The method of claim 12 , further comprising outputting a fingerprint template comprising a normal fingerprint template corresponding to the normal fingerprint image and a dry fingerprint template corresponding to the dry fingerprint image.
16. The method of claim 15 , further comprising:
identifying the display device is in the fingerprint authentication mode;
receiving the fingerprint sensing signal;
generating a fingerprint image corresponding to the fingerprint sensing signal;
comparing the fingerprint image with the fingerprint template; and
determining that a user authentication is successful in response to the fingerprint image matching with the fingerprint template.
17. The method of claim 16 , further comprising, after identifying the display device is in the fingerprint authentication mode:
comparing the fingerprint image with the normal fingerprint template in the fingerprint template; and
comparing the fingerprint image with the dry fingerprint template in the fingerprint template in response to the fingerprint image not matching with the normal fingerprint template.
18. The method of claim 16 , further comprising determining that the user authentication is successful in response to the fingerprint image matching at least one of the normal fingerprint template or the dry fingerprint template.
19. The method of claim 16 , wherein the generating of the fingerprint image corresponding to the fingerprint sensing signal comprises:
determining whether or not the fingerprint image is a dry fingerprint image;
converting the dry fingerprint image to the normal fingerprint image in response to determining that the fingerprint image is the dry fingerprint image;
comparing the normal fingerprint image with the normal fingerprint template in the fingerprint template; and
comparing the normal fingerprint image with the dry fingerprint template in the fingerprint template in response to the normal fingerprint image not matching with the normal fingerprint template.
20. The method of claim 12 , wherein the generating of the dry fingerprint image corresponding to the fingerprint sensing signal in the fingerprint registration mode is performed in response to a dry fingerprint automatic registration being selected by a user.