Electronic device and fingerprint sensing method

1. An electronic device, comprising:

a display panel comprising a plurality of pixel units arranged in an array;

a fingerprint sensor disposed below a sensing area of the display panel; and

an integrated driver chip coupled to the display panel and the fingerprint sensor and integrated with a display driver circuit and a fingerprint sensing circuit, wherein the display driver circuit is configured to drive the display panel, and the fingerprint sensing circuit is configured to drive the fingerprint sensor,

wherein when the pixel units of the display panel are in an undriven state and a finger object is in contact with the sensing area of the display panel to perform a fingerprint unlock operation, the display driver circuit drives at least one portion of the pixel units corresponding to the sensing area such that the at least one portion of the pixel units provide an illumination light to the sensing area, where the at least one portion of the driven pixel units of the display panel in the sensing area continuously displays a plurality of light source patterns having different periodic variation patterns, and the fingerprint sensing circuit drives the fingerprint sensor to capture a plurality of fingerprint feature images of the finger object,

wherein the fingerprint sensing circuit superimposes the fingerprint feature images to generate a recombined fingerprint feature image,

wherein each one of the plurality of light source pattern comprises a plurality of bright area patterns arranged separately, and there is at least one dark area pattern between any indirectly adjacent two bright patterns area in the plurality of bright area patterns,

wherein each of the plurality of bright area patterns is composed of a plurality of directly adjacent illuminated pixel units arranged continuously and non-intermittently, and there is no dark area pattern between any consecutive two directly adjacent illuminated pixel units in the each of the plurality of bright area patterns.

2. The electronic device of claim 1 , wherein the sensing area of the display panel is smaller than a display area of the display panel.

3. The electronic device of claim 1 , wherein a non-sensing area of the display panel corresponds to another portion of the pixel units, and when the finger object is in contact with the sensing area of the display panel to perform the fingerprint unlock operation, the other portion of the pixel units corresponding to the non-sensing area remains in the undriven state.

4. The electronic device of claim 1 , wherein the display panel is an active-matrix organic light-emitting display, and the pixel units comprise a plurality of color pixel types.

5. The electronic device of claim 4 , wherein when the finger object is in contact with the sensing area of the display panel to perform the fingerprint unlock operation, the at least one portion of the pixel units driven by the display driver circuit is at least one of the color pixel types.

6. The electronic device of claim 1 , wherein when the finger object is in contact with the sensing area of the display panel to perform the fingerprint unlock operation, the at least one portion of the driven pixel units of the display panel in the sensing area display a light source pattern, and the light source pattern is a periodic variation pattern or a non-periodic variation pattern,

wherein the light source pattern comprises a plurality of bright area patterns and a plurality of dark area patterns.

7. The electronic device of claim 6 , wherein the light source pattern is the periodic variation pattern, and at least one of the bright area patterns and the dark area patterns in at least one of a first direction and a second direction are periodically arranged.

8. The electronic device of claim 1 , wherein the fingerprint sensing circuit is further used to drive the fingerprint sensor to capture a light-emitting state image of the sensing area of the display panel, and the fingerprint sensing circuit analyzes the light-emitting state image, so that the integrated driver chip adjusts a driving voltage or a driving current provided by the display driver circuit to the display panel according to the light-emitting state image.

9. The electronic device of claim 8 , wherein the integrated driver chip is further used to record an adjustment history of the driving voltage or the driving current and return the adjustment history to a cloud server.

10. A fingerprint sensing method adapted for an electronic device, wherein the electronic device comprises a display panel, a fingerprint sensor, and an integrated driver chip, and the display panel comprises a plurality of pixel units arranged in an array, wherein the fingerprint sensing method comprises:

driving at least one portion of the pixel units corresponding to a sensing area through a display driver circuit integrated in the integrated driver chip when the pixel units of the display panel are in an undriven state and a finger object is in contact with the sensing area of the display panel to perform a fingerprint unlock operation such that the at least one portion of the pixel units provide an illumination light to the sensing area, and continuously displaying a plurality of light source patterns having different periodic variation patterns through the at least one portion of the driven pixel units of the display panel in the sensing area;

driving the fingerprint sensor through a fingerprint sensing circuit integrated in the integrated driver chip to capture a plurality of fingerprint feature images of the finger object; and

superimposing the fingerprint feature images through the fingerprint sensing circuit to generate a recombined fingerprint feature image,

wherein each one of the plurality of light source pattern comprises a plurality of bright area patterns arranged separately, and there is at least one dark area pattern between any indirectly adjacent two bright patterns area in the plurality of bright area patterns,

wherein each of the plurality of bright area patterns is composed of a plurality of directly adjacent illuminated pixel units arranged continuously and non-intermittently, and there is no dark area pattern between any consecutive two directly adjacent illuminated pixel units in the each of the plurality of bright area patterns.

11. The fingerprint sensing method of claim 10 , wherein the sensing area of the display panel is smaller than a display area of the display panel.

12. The fingerprint sensing method of claim 10 , wherein a non-sensing area of the display panel corresponds to another portion of the pixel units, and when the finger object is in contact with the sensing area of the display panel to perform the fingerprint unlock operation, the other portion of the pixel units corresponding to the non-sensing area remains in the undriven state.

13. The fingerprint sensing method of claim 10 , wherein the display panel is an active-matrix organic light-emitting display, and the pixel units comprise a plurality of color pixel types.

14. The fingerprint sensing method of claim 13 , wherein when the finger object is in contact with the sensing area of the display panel to perform the fingerprint unlock operation, the at least one portion of the pixel units driven by the display driver circuit is at least one of the color pixel types.

15. The fingerprint sensing method of claim 10 , wherein the step of driving the at least one portion of the pixel units corresponding to the sensing area through the display driver circuit integrated in the integrated driver chip comprises:

displaying a light source pattern through the at least one portion of the driven pixel units of the display panel in the sensing area, and the light source pattern is a periodic variation pattern or a non-periodic variation pattern,

wherein the light source pattern comprises a plurality of bright area patterns and a plurality of dark area patterns.

16. The fingerprint sensing method of claim 15 , wherein the light source pattern is the periodic variation pattern, and at least one of the bright area patterns and the dark area patterns in at least one of a first direction and a second direction are periodically arranged.

17. The fingerprint sensing method of claim 10 , further comprising:

driving the fingerprint sensor through the fingerprint sensing circuit to capture a light-emitting state image of the sensing area of the display panel; and

analyzing the light-emitting state image through the fingerprint sensing circuit so that the integrated driver chip adjusts a driving voltage or a driving current provided by the display driver circuit to the display panel according to the light-emitting state image.

18. The fingerprint sensing method of claim 17 , further comprising:

recording an adjustment history of the driving voltage or the driving current through the integrated driver chip and returning the adjustment history to a cloud server.