PPG sensor and electronic device

1 . An electronic device, comprising: a body and a photoplethysmograph (PPG) sensor, wherein the PPG sensor is disposed on the body, and is electrically connected to a circuit board in the body; and the PPG sensor comprises a substrate, a first electrode, a light emitting layer, a light receiving layer, a second transparent electrode, and a transparent panel that are integrally packaged, wherein

the substrate and the first electrode are both located on one side of the light emitting layer, and the second transparent electrode and the transparent panel are both located on the other side of the light emitting layer; and the light receiving layer, the first electrode, and the second transparent electrode are located between the substrate and the transparent panel, and a polarity of the first electrode and a polarity of the second transparent electrode are opposite; and

the light emitting layer comprises a plurality of light emitting pixels for emitting an optical signal, and the light receiving layer comprises a plurality of light receiving pixels for detecting the optical signal; wherein the light emitting layer further comprises display pixels arranged in an array, and the light emitting layer and the light receiving layer are integrated in a same light emitting-receiving layer.

2 . The electronic device according to claim 1 , wherein the light emitting layer comprises a central region and an edge region around the central region, the display pixels are distributed in the central region, and at least one of the plurality of the light emitting pixels and at least one of the plurality of the light receiving pixels are distributed in the edge region.

3 . The electronic device according to claim 1 , wherein the display pixels comprise a first display pixel, a second display pixel, and a third display pixel in different colors, and three colors of the first display pixel, the second display pixel, and the third display pixel are respectively red, green, and blue; and

the first display pixel and target pixels are alternately arranged in a first direction, the first display pixel and the second display pixel are alternately arranged in a second direction, the second display pixel and the third display pixel are alternately arranged in the first direction, and the first direction is perpendicular to the second direction; and and the target pixels comprise more than one of the light emitting pixels and more than one of the light receiving pixels.

4 . The electronic device according to claim 3 , wherein the plurality of light emitting pixels relate to a plurality of wavelengths, the target pixels comprise the plurality of the light emitting pixels and the plurality of light receiving pixels, and each target pixel adjacent to one of the plurality of light receiving pixels is one of the plurality of light emitting pixels.

5 . The electronic device according to claim 4 , wherein for each light receiving pixel, light emitting pixels adjacent to the light receiving pixel comprise a red light emitting pixel and an infrared light emitting pixel, a distance between the red light emitting pixel and the light receiving pixel is equal to a distance between the infrared light emitting pixel and the light receiving pixel.

6 . The electronic device according to claim 5 , wherein the light emitting pixels comprise a first light emitting pixel, a second light emitting pixel, and a green light emitting pixel, one of the first light emitting pixel and the second light emitting pixel is the red light emitting pixel, and the other is the infrared light emitting pixel; and

the first light emitting pixel and the green light emitting pixel are alternately arranged in the first direction, the first light emitting pixel and the light receiving pixel are alternately arranged in the second direction, and the light receiving pixel and the second light emitting pixel are alternately arranged in the first direction.

7 . The electronic device according to claim 3 , wherein the light emitting pixels comprise more than one red display pixels or more than one green display pixels among the display pixels, and the target pixels comprise the light receiving pixels.

8 . The electronic device according to claim 7 , wherein the light emitting pixels further comprise infrared light emitting pixels, and the target pixels further comprise the infrared light emitting pixels; and at least one of the following is true:

each target pixel adjacent to one of the light receiving pixels is one of the infrared light emitting pixels, or

each target pixel adjacent to one of the infrared light emitting pixels is one of the light receiving pixels.

9 . The electronic device according to claim 3 , wherein each display pixel comprises four subpixels in corresponding colors.

10 . The electronic device according to claim 1 , wherein the display pixels comprise red display pixels, green display pixels, and blue display pixels, the light emitting layer comprises pixel units arranged in an array, each pixel unit comprises one red display pixel, one green display pixel, one blue display pixel, and one target pixel that are sequentially arranged in a first direction, and the target pixels comprise more than one of the light emitting pixels.

11 . The electronic device according to claim 10 , wherein the light emitting pixels comprise an infrared light emitting pixel, a red light emitting pixel, and a green light emitting pixel, and the target pixels comprise the plurality of light emitting pixels; or

the light emitting pixels comprise more than one red display pixels and more than one green display pixels among the display pixels, and an infrared light emitting pixel, and the target pixels comprise the infrared light emitting pixel.

12 . The electronic device according to claim 11 , wherein the target pixels further comprise at least one of the plurality of the light receiving pixels.

13 . The electronic device according to claim 11 , wherein there is an isolation column between the display pixel and each adjacent pixel among the target pixels, at least one of the plurality of the light receiving pixels is disposed on the isolation column.

14 . The electronic device according to claim 1 , wherein a light source of the display pixels is a miniature light-emitting diode (LED), and a light source of at least one of the plurality of the light emitting pixels is a miniature LED or a vertical-cavity surface-emitting laser (VCSEL).

15 . The electronic device according to claim 1 , wherein the light emitting pixels relate to a plurality of wavelengths, and the light emitting pixels with various wavelengths and the light receiving pixels are alternately arranged.

16 . The electronic device according to claim 15 , wherein each pixel adjacent to one of the plurality of light receiving pixels is a light emitting pixel.

17 . The electronic device according to claim 1 , wherein the light receiving layer is located between the second transparent electrode and the transparent panel.

18 . The electronic device according to claim 1 , wherein the electronic device further comprises a thin film transistor (TFT) layer located between the substrate and the first electrode, and a drive circuit of at least one of the plurality of the light emitting pixels and a receiver circuit of at least one of the plurality of the light receiving pixels are integrated in the TFT layer.

19 . The electronic device according to claim 18 , wherein an analog front end (AFE) circuit is integrated in the TFT layer, and the AFE is configured to amplify and sample an optical signal received by the receiver circuit.

20 . The electronic device according to claim 1 , wherein the PPG sensor further comprises at least one of a polarizer or a touch panel that is located between the second transparent electrode and the transparent panel.