# US 12,594,033 B2 · Photoelectric detector, PPG sensor, and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,594,033 B2 - Document ID: US12594033B2 - Status: Granted - Kind: B2 - Application number: 18/043,841 - Filed: 2022-09-01 - Published: 2024-10-03 - Granted: 2026-04-07 - Earliest claimed: 2021-12-07 - Assignees: Honor Device Co., Ltd. - Applicants: Honor Device Co., Ltd. - Inventors: Yinjiong Tan; Ruiying Shang; Bingxin Liu; Xinpei Cai - Web page: https://patentgrep.com/patent/US12594033B2 ## CPC - A61B 5/681: {Wristwatch-type devices} - A61B 5/02427: {Details of sensor} - A61B 5/02433: {for infrared radiation} - A61B 5/14552: {Details of sensors specially adapted therefor} - A61B 2562/0233: Special features of optical sensors or probes classified in A61B5/00 - A61B 2562/0238: Optical sensor arrangements for performing transmission measurements on body tissue - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A photoelectric detector, a PPG sensor, and an electronic device are provided. The photoelectric detector includes a photo diode, configured to sense light on a first band, a second band, and a third band; at least one first optical filter part, located on the photo diode, and configured to transmit light on the first band and the second band, and block light on the third band; and at least one second optical filter part, located on the photo diode, and configured to transmit the light on the third band and block the light on the first band and the second band. ## Claims ### Claim 1 A photoelectric detector, comprising: a photo diode, configured to sense light on a first band, a second band, and a third band; at least one first optical filter part, located on the photo diode, and configured to transmit light on the first band and the second band and block light on the third band; and at least one second optical filter part, located on the photo diode, configured to transmit the light on the third band and block the light on the first band and the second band, and wherein a plurality of first optical filters and a plurality of second optical filters are arranged in a matrix with a plurality of rows and columns, and in the plurality of rows and columns, one first optical filter part and one second optical filter part are arranged alternately and cyclically in each row, and one first optical filter part and one second optical filter part are arranged alternately and cyclically in each column. ### Claim 2 (depends on 1) The photoelectric detector according to claim 1, wherein the first band is in a red light spectrum, the second band is in an infrared light spectrum, and the third band is in a green light spectrum. ### Claim 3 (depends on 1) The photoelectric detector according to claim 1, wherein in a thickness direction of the photo diode, a ratio of an area of a projection of the at least one first optical filter part on the photo diode to an area of a projection of the at least one second optical filter part on the photo diode is 1:(1.6˜1.3). ### Claim 4 (depends on 3) The photoelectric detector according to claim 3, wherein a quantity of the first optical filter parts and a quantity of the second optical filter parts are the same, and in the thickness direction of the photo diode, the ratio of the an area of a projection of each first optical filter part on the photo diode to a an area of a projection of each second optical filter part on the photo diode is 1:(1.6˜1.3). ### Claim 5 (depends on 3) The photoelectric detector according to claim 3, wherein in the thickness direction of the photo diode, an area of each projection of the first optical filter part on the photo diode is the same as an area of each projection of the second optical filter part on the photo diode, and a ratio of a quantity of the first optical filter parts to a quantity of the second optical filter parts is 1:(1.6˜1.3). ### Claim 6 (depends on 1) The photoelectric detector according to claim 1, wherein in a thickness direction of the photo diode, a projection of the first optical filter part on the photo diode is a rectangle, and a projection of the second optical filter part on the photo diode is a rectangle. ### Claim 7 (depends on 6) The photoelectric detector according to claim 6, wherein in the thickness direction of the photo diode, a width of the rectangle formed by the projection of the first optical filter part on the photo diode is the same as a width of the rectangle formed by the projection of the second optical filter part on the photo diode. ### Claim 8 A photo plethysmo graph (PPG) sensor, comprising: a photoelectric detector, comprising a photo diode, configured to sense light on a first band, a second band, and a third band; at least one first optical filter part, located on the photo diode, and configured to transmit light on the first band and the second band and block light on the third band; and at least one second optical filter part, located on the photo diode, configured to transmit the light on the third band and block the light on the first band and the second band, and wherein a plurality of first optical filters and a plurality of second optical filters are arranged in a matrix with a plurality of rows and columns, and in the plurality of rows and columns, one first optical filter part and one second optical filter part are arranged alternately and cyclically in each row, and one first optical filter part and one second optical filter part are arranged alternately and cyclically in each column; a first light source, configured to send a first optical signal, wherein at least a part of light obtained after the first optical signal is reflected by skin or tissue of a user is on the first band; a second light source, configured to send a second optical signal, wherein at least a part of light obtained after the second optical signal is reflected by the skin or tissue of the user is on the second band; and a third light source, configured to send a third optical signal, wherein at least a part of light obtained after the third optical signal is reflected by the skin or tissue of the user is on the third band; wherein the photoelectric detector is configured to receive light on the first band and generate a first PPG signal, receive light on the second band and generate a second PPG signal, and receive light on the third band and generate a third PPG signal, wherein the first PPG signal, the second PPG signal, and the third PPG signal are used to detect physiological characteristics of the user. ### Claim 9 (depends on 8) The PPG sensor according to claim 8, wherein the PPG sensor comprises a light source group, the light source group comprises a first light source, a second light source, and a third light source, and a plurality of photoelectric detectors are spaced around the light source group. ### Claim 10 (depends on 9) The PPG sensor according to claim 9, wherein the PPG sensor comprises a plurality of light source groups that are spaced. ### Claim 11 (depends on 8) The PPG sensor according to claim 8, wherein the physiological characteristics comprise oxygen saturation and a heart rate; the first optical signal is red light, the second optical signal is infrared light, and the first PPG signal and the second PPG signal are used to detect the oxygen saturation of the user; and the third optical signal is green light, and the third PPG signal is used to detect the heart rate of the user. ### Claim 12 (depends on 8) The PPG sensor according to claim 8, wherein the first band is in a red light spectrum, the second band is in an infrared light spectrum, and the third band is in a green light spectrum. ### Claim 13 (depends on 8) The PPG sensor according to claim 8, wherein in a thickness direction of the photo diode, a ratio of an area of a projection of the at least one first optical filter part on the photo diode to an area of a projection of the at least one second optical filter part on the photo diode is 1:(1.6˜1.3). ### Claim 14 (depends on 13) The PPG sensor according to claim 13, wherein a quantity of the first optical filter parts and a quantity of the second optical filter parts are the same, and in the thickness direction of the photo diode, the ratio of the an area of a projection of each first optical filter part on the photo diode to a an area of a projection of each second optical filter part on the photo diode is 1:(1.6˜1.3). ### Claim 15 (depends on 13) The PPG sensor according to claim 13, wherein in the thickness direction of the photo diode, an area of each projection of the first optical filter part on the photo diode is the same as an area of each projection of the second optical filter part on the photo diode, and a ratio of a quantity of the first optical filter parts to a quantity of the second optical filter parts is 1:(1.6˜1.3). ### Claim 16 (depends on 8) The PPG sensor according to claim 8, wherein in a thickness direction of the photo diode, a projection of the first optical filter part on the photo diode is a rectangle, and a projection of the second optical filter part on the photo diode is a rectangle. ### Claim 17 (depends on 16) The PPG sensor according to claim 16, wherein in the thickness direction of the photo diode, a width of the rectangle formed by the projection of the first optical filter part on the photo diode is the same as a width of the rectangle formed by the projection of the second optical filter part on the photo diode. ### Claim 18 An electronic device, comprising a photo plethysmo graph (PPG) sensor, comprising: a photoelectric detector, comprising a photo diode, configured to sense light on a first band, a second band, and a third band; at least one first optical filter part, located on the photo diode, and configured to transmit light on the first band and the second band and block light on the third band; and at least one second optical filter part, located on the photo diode, configured to transmit the light on the third band and block the light on the first band and the second band, and wherein a plurality of first optical filters and a plurality of second optical filters are arranged in a matrix with a plurality of rows and columns, and in the plurality of rows and columns, one first optical filter part and one second optical filter part are arranged alternately and cyclically in each row, and one first optical filter part and one second optical filter part are arranged alternately and cyclically in each column; a first light source, configured to send a first optical signal, wherein at least a part of light obtained after the first optical signal is reflected by skin or tissue of a user is on the first band; a second light source, configured to send a second optical signal, wherein at least a part of light obtained after the second optical signal is reflected by the skin or tissue of the user is on the second band; and a third light source, configured to send a third optical signal, wherein at least a part of light obtained after the third optical signal is reflected by the skin or tissue of the user is on the third band; wherein the photoelectric detector is configured to receive light on the first band and generate a first PPG signal, receive light on the second band and generate a second PPG signal, and receive light on the third band and generate a third PPG signal, wherein the first PPG signal, the second PPG signal, and the third PPG signal are used to detect physiological characteristics of the user. ### Claim 19 (depends on 18) The electronic device according to claim 18, wherein the first band is in a red light spectrum, the second band is in an infrared light spectrum, and the third band is in a green light spectrum. ### Claim 20 (depends on 18) The electronic device according to claim 18, wherein in a thickness direction of the photo diode, a ratio of an area of a projection of the at least one first optical filter part on the photo diode to an area of a projection of the at least one second optical filter part on the photo diode is 1:(1.6˜1.3).