Biometric sensor, display apparatus, and method for detecting biometric information

1. A biometric sensor configured to detect a biometric information, comprising:

a base substrate;

a light emitting layer and a touch detection layer on the base substrate;

an encapsulating cover on a side of the light emitting layer away from the base substrate;

a photo-sensing layer between the light emitting layer and the base substrate, and comprising a plurality of photosensors configured to detect at least a portion of a light totally reflected by a surface of the biometric sensor in touch with a skin of a user;

a touch sensing circuit configured to determine a touch position of a touch;

a processor configured to determine a scanning region based on the touch position, and configured to control the light emitting layer to form a scanning light source to scan the scanning region in a scanning pattern, the scanning region encompassing the touch position; and

a biometric information analysis circuit configured to determine a light intensity distribution of a reflected light reflected by the surface of the biometric sensor in touch with the skin of the user based on signals from the plurality of photosensors, and configured to determine the biometric information based on the light intensity distribution;

wherein the processor is configured to control multiple consecutive data lines extending through the scanning region to simultaneously transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region, and configured to turn on multiple rows of thin film transistors in the scanning region, through multiple consecutive gate lines, thereby forming a first linear scanning light source limited in the scanning region to scan the scanning region along a column direction.

2. The biometric sensor of claim 1 , wherein the scanning pattern comprises linear scanning lines.

3. The biometric sensor of claim 1 , wherein the light emitting layer comprises:

an array of a plurality of light emitting elements;

a plurality of thin film transistors respectively driving light emission of the plurality of light emitting elements;

a plurality of data lines; and

a plurality of gate lines;

wherein a respective one of the plurality of data lines is electrically connected to source electrodes of thin film transistors in a column of the plurality of thin film transistors;

a respective one of the plurality of gate lines is electrically connected to gate electrodes of thin film transistors in a row of the plurality of thin film transistors;

drain electrodes of the plurality of thin film transistors are respectively electrically connected to the plurality of light emitting elements; and

the processor is configured to control turning on or off the plurality of thin film transistors respectively through the plurality of gate lines, and configured to control transmission of data signals to the plurality of light emitting elements respectively through the plurality of data lines.

4. The biometric sensor of claim 1 , wherein the processor is further configured to simultaneously turn on multiple consecutive rows of thin film transistors in the scanning region through multiple consecutive gate lines, and configured to control multiple consecutive data lines extending through the scanning region to transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region thereby forming a second linear scanning light source limited in the scanning region to scan the scanning region along a row direction.

5. The biometric sensor of claim 1 , wherein the processor is further configured to control the light emitting layer to form the scanning light source in a time-division mode comprising a first scanning mode, and a second scanning mode;

the first scanning mode comprises a plurality of first scanning periods;

the second scanning mode comprises a plurality of second scanning periods; and

the plurality of first scanning periods and the plurality of second scanning periods are alternately arranged;

in the first scanning mode, the processor is configured to control multiple consecutive data lines extending through the scanning region to simultaneously transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region, and configured to turn on multiple rows of thin film transistors in the scanning region through multiple consecutive gate lines in the plurality of first scanning periods in a first sequential order, thereby forming a first linear scanning light source limited in the scanning region to scan the scanning region along a column direction; and

in the second scanning mode, the processor is further configured to simultaneously turn on multiple consecutive rows of thin film transistors in the scanning region through multiple consecutive gate lines, and configured to control multiple consecutive data lines extending through the scanning region to transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region in the plurality of second scanning periods in a second sequential order thereby forming a second linear scanning light source limited in the scanning region to scan the scanning region along a row direction.

6. The biometric sensor of claim 1 , wherein the processor is configured to control multiple light emitting elements limited in the scanning region to time-sequentially forming a plurality of point light sources consecutively arranged, one of the plurality of point light sources turning on at a time while a remainder of the plurality of point light sources turned off, thereby forming the scanning pattern comprising linear scanning lines;

wherein a respective one of the plurality of point light sources comprises one or multiple adjacent light emitting elements.

7. The biometric sensor of claim 6 , wherein the scanning pattern comprises a continuous folded line comprising a plurality of linear lines parallel to each other.

8. The biometric sensor of claim 1 , wherein the touch detection layer is on a side of the encapsulating cover away from the base substrate.

9. The biometric sensor of claim 1 , wherein the touch detection layer is between the encapsulating cover and the light emitting layer.

10. The biometric sensor of claim 1 , wherein the touch detection layer is between the light emitting layer and the photo-sensing layer.

11. The biometric sensor of claim 1 , wherein the touch detection layer comprises a plurality of touch scanning electrode and a plurality of touch sensing electrodes intersecting each other.

12. A display apparatus, comprising the biometric sensor of claim 1 , and one or more integrated circuits connected to the biometric sensor.

13. A method for detecting a biometric information, comprising:

providing a biometric sensor comprising a base substrate, a light emitting layer and a touch detection layer on the base substrate, an encapsulating cover on a side of the light emitting layer away from the base substrate, and a photo-sensing layer between the light emitting layer and the base substrate;

determining a touch position of a touch by a touch sensing circuit;

determining a scanning region based on the touch position;

controlling the light emitting layer to form a scanning light source to scan the scanning region in a scanning pattern, the scanning region encompassing the touch position;

detecting at least a portion of a light totally reflected by a surface of the biometric sensor in touch with a skin of a user by a plurality of photosensors in the photo-sensing layer;

determining a light intensity distribution of a reflected light reflected by the surface of the biometric sensor in touch with the skin of the user based on signals from the plurality of photosensors; and

determining the biometric information based on the light intensity distribution;

wherein the light emitting layer comprises:

an array of a plurality of light emitting elements;

a plurality of thin film transistors respectively driving light emission of the plurality of light emitting elements;

a plurality of data lines; and

a plurality of gate lines;

wherein a respective one of the plurality of data lines is electrically connected to source electrodes of thin film transistors in a column of the plurality of thin film transistors;

a respective one of the plurality of gate lines is electrically connected to gate electrodes of thin film transistors in a row of the plurality of thin film transistors; and

drain electrodes of the plurality of thin film transistors are respectively electrically connected to the plurality of light emitting elements;

wherein the method further comprises turning on or off the plurality of thin film transistors respectively through the plurality of gate lines, and controlling transmission of data signals to the plurality of light emitting elements respectively through the plurality of data lines, in a time-division mode comprising a first scanning mode and a second scanning mode;

the first scanning mode comprises a plurality of first scanning periods;

the second scanning mode comprises a plurality of second scanning periods; and

the plurality of first scanning periods and the plurality of second scanning periods are alternately arranged;

wherein controlling the light emitting layer to form the scanning light source in the first scanning mode comprises:

controlling multiple consecutive data lines extending through the scanning region to simultaneously transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region, and

turning on multiple rows of thin film transistors in the scanning region through multiple consecutive gate lines in the plurality of first scanning periods in a first sequential order, thereby forming a first linear scanning light source limited in the scanning region to scan the scanning region along a column direction;

wherein controlling the light emitting layer to form the scanning light source in the second scanning mode comprises:

simultaneously turning on multiple consecutive rows of thin film transistors in the scanning region through multiple consecutive gate lines; and

controlling multiple consecutive data lines extending through the scanning region to transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region in the plurality of second scanning periods in a second sequential order, thereby forming a second linear scanning light source limited in the scanning region to scan the scanning region along a row direction.

14. The method of claim 13 , wherein the scanning pattern comprises linear scanning lines.

15. The method of claim 13 , wherein the light emitting layer comprises:

an array of a plurality of light emitting elements;

a plurality of thin film transistors respectively driving light emission of the plurality of light emitting elements;

a plurality of data lines; and

a plurality of gate lines;

wherein a respective one of the plurality of data lines is electrically connected to source electrodes of thin film transistors in a column of the plurality of thin film transistors;

a respective one of the plurality of gate lines is electrically connected to gate electrodes of thin film transistors in a row of the plurality of thin film transistors; and

drain electrodes of the plurality of thin film transistors are respectively electrically connected to the plurality of light emitting elements; and

wherein the method further comprises turning on or off the plurality of thin film transistors respectively through the plurality of gate lines, and controlling transmission of data signals to the plurality of light emitting elements respectively through the plurality of data lines;

wherein controlling the light emitting layer to form the scanning light source comprises:

controlling multiple consecutive data lines extending through the scanning region to simultaneously transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region, and

turning on multiple rows of thin film transistors in the scanning region through multiple consecutive gate lines in a first sequential order, thereby forming a first linear scanning light source limited in the scanning region to scan the scanning region along a column direction.

16. The method of claim 13 , wherein the light emitting layer comprises:

an array of a plurality of light emitting elements;

a plurality of thin film transistors respectively driving light emission of the plurality of light emitting elements;

a plurality of data lines; and

a plurality of gate lines;

wherein a respective one of the plurality of data lines is electrically connected to source electrodes of thin film transistors in a column of the plurality of thin film transistors;

a respective one of the plurality of gate lines is electrically connected to gate electrodes of thin film transistors in a row of the plurality of thin film transistors; and

drain electrodes of the plurality of thin film transistors are respectively electrically connected to the plurality of light emitting elements;

wherein the method further comprises turning on or off the plurality of thin film transistors respectively through the plurality of gate lines, and controlling transmission of data signals to the plurality of light emitting elements respectively through the plurality of data lines;

wherein controlling the light emitting layer to form the scanning light source comprises:

simultaneously turning on multiple consecutive rows of thin film transistors in the scanning region through multiple consecutive gate lines; and

controlling multiple consecutive data lines extending through the scanning region to transmit data signals to sources electrodes of multiple columns of thin film transistors in the scanning region in a second sequential order, thereby forming a second linear scanning light source limited in the scanning region to scan the scanning region along a row direction.

17. The method of claim 13 , wherein the light emitting layer comprises:

an array of a plurality of light emitting elements;

a plurality of thin film transistors respectively driving light emission of the plurality of light emitting elements;

a plurality of data lines; and

a plurality of gate lines;

wherein a respective one of the plurality of data lines is electrically connected to source electrodes of thin film transistors in a column of the plurality of thin film transistors;

a respective one of the plurality of gate lines is electrically connected to gate electrodes of thin film transistors in a row of the plurality of thin film transistors; and

drain electrodes of the plurality of thin film transistors are respectively electrically connected to the plurality of light emitting elements;

wherein the method further comprises turning on or off the plurality of thin film transistors respectively through the plurality of gate lines, and controlling transmission of data signals to the plurality of light emitting elements respectively through the plurality of data lines;

wherein controlling the light emitting layer to form the scanning light source comprises:

controlling multiple light emitting elements limited in the scanning region to time-sequentially forming a plurality of point light sources consecutively arranged, one of the plurality of point light sources turning on at a time while a remainder of the plurality of point light sources turned off, thereby forming the scanning pattern comprising linear scanning lines;

wherein a respective one of the plurality of point light sources comprises one or multiple adjacent light emitting elements.

18. The method of claim 17 , wherein the scanning pattern comprises a continuous folded line comprising a plurality of linear lines parallel to each other.