# US 11,432,774 B2 · Pulse oximeters and pulse oximeter embedded organic image sensors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,432,774 B2 - Document ID: US11432774B2 - Status: Granted - Kind: B2 - Application number: 16/255,981 - Filed: 2019-01-24 - Published: 2019-08-08 - Granted: 2022-09-06 - Earliest claimed: 2018-02-05 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Chui Joon Heo; Kyung Bae Park; Dongseon Lee; Moon Gyu Han; Takkyun Ro; Youn Hee Lim; Yong Wan Jin; Kiyohiko Tsutsumi - Web page: https://patentgrep.com/patent/US11432774B2 ## CPC - A61B 5/02416: {using photoplethysmograph signals, e.g. generated by infrared radiation (A61B5/14552 takes precedence)} - A61B 5/0205: Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition - A61B 5/02427: {Details of sensor} - A61B 5/14551: {for measuring blood gases} - A61B 5/14552: {Details of sensors specially adapted therefor} - A61B 5/6801: {specially adapted to be attached to or worn on the body surface} - A61B 5/6898: {Portable consumer electronic devices, e.g. music players, telephones, tablet computers} - A61B 5/7278: {Artificial waveform generation or derivation, e.g. synthesizing signals from measured signals} - A61B 5/742: {using visual displays (displays for heart-related electrical signals, e.g. ECG, A61B5/339)} - H10K 39/32: Organic image sensors - A61B 5/02007: {Evaluating blood vessel condition, e.g. elasticity, compliance} - A61B 5/02433: {for infrared radiation} - A61B 5/6833: {Adhesive patches} - A61B 2562/046: in a matrix array - A61B 2576/00: Medical imaging apparatus involving image processing or analysis (A61B1/00009, A61B6/52 and A61B8/52 take precedence) - G16H 30/40: for processing medical images, e.g. editing - H10F 39/182: {Colour image sensors} - H10F 39/193: {Infrared image sensors} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA - H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION ## Abstract A pulse oximeter may include a photoelectric conversion device having wavelength selectivity so that a low output LED may be included in the pulse oximeter to prevent skin damage and to reduce power consumption. The pulse oximeter includes a light emitting device configured to emit white light and a sensor configured to detect transmitted light that is received from the light emitting device. The sensor includes a near infrared organic photoelectric conversion device configured to sense a particular near infrared wavelength spectrum of light and a red photoelectric conversion device configured to sense a particular red wavelength spectrum of light. ## Claims ### Claim 1 A pulse oximeter, comprising: a light emitting device configured to emit white light having an intensity of about 1 to about 10 mW to irradiate a blood vessel; and a sensor configured to detect transmitted light that is received from the light emitting device, subsequently to the transmitted light having irradiated the blood vessel, the sensor including a near infrared organic photoelectric conversion device on a semiconductor substrate, the near infrared organic photoelectric conversion device configured to sense a particular near infrared wavelength spectrum of light, and an array of inorganic photoelectric conversion devices embedded in the semiconductor substrate, the array of inorganic photoelectric conversion devices including a red inorganic photoelectric conversion device configured to sense a particular red wavelength spectrum of light, a blue inorganic photoelectric conversion device configured to sense a particular blue wavelength spectrum of light, and a green inorganic photoelectric conversion device configured to sense a particular green wavelength spectrum of light, wherein each separate inorganic photoelectric conversion device of the array of inorganic photoelectric conversion devices is overlapped with a separate portion of the near infrared organic photoelectric conversion device. ### Claim 2 (depends on 1) The pulse oximeter of claim 1, further comprising: a signal processor configured to calculate a heart rate and oxygen saturation based on a determination of an absorbance of near infrared light that is measured by the near infrared organic photoelectric conversion device based on at least a portion of the transmitted light in the particular near infrared wavelength spectrum being absorbed by the near infrared organic photoelectric conversion device, and an absorbance of red light that is measured by the red inorganic photoelectric conversion device based on at least a portion of the transmitted light in the particular red wavelength spectrum being absorbed by the red inorganic photoelectric conversion device. ### Claim 3 A pulse oximeter-embedded near infrared organic image sensor, comprising: an array of inorganic photoelectric conversion devices embedded in a semiconductor substrate and at least partially defining a plurality of unit pixels, the array of inorganic photoelectric conversion devices including a plurality of inorganic red photoelectric conversion devices configured to sense a particular red wavelength spectrum of light, a plurality of inorganic blue photoelectric conversion devices configured to sense a particular blue wavelength spectrum of light, and a plurality of inorganic green photoelectric conversion devices configured to sense a particular green wavelength spectrum of light; and a near infrared organic photoelectric conversion device on the array of inorganic photoelectric conversion devices embedded in the semiconductor substrate, the near infrared organic photoelectric conversion device including a near infrared organic photoelectric conversion layer on the semiconductor substrate, the near infrared organic photoelectric conversion layer configured to sense a particular near infrared wavelength spectrum of light, a common electrode on the near infrared organic photoelectric conversion layer, and an array of pixel electrodes between the near infrared organic photoelectric conversion layer and the semiconductor substrate, wherein the plurality of inorganic red photoelectric conversion devices and the near infrared organic photoelectric conversion device are configured to detect light received from a light emitting device subsequently to the light irradiating a blood vessel, wherein each separate unit pixel of the plurality of unit pixels of the pulse oximeter-embedded near infrared organic image sensor includes a separate plurality of inorganic photoelectric conversion devices of the array of inorganic photoelectric conversion devices, the separate plurality of inorganic photoelectric conversion devices including a separate red inorganic photoelectric conversion device of the plurality of inorganic red photoelectric conversion devices, a separate blue inorganic photoelectric conversion device of the plurality of inorganic blue photoelectric conversion devices, and a separate green inorganic photoelectric conversion device of the plurality of inorganic green photoelectric conversion devices, and separate pixel electrodes of the array of pixel electrodes that are each overlapped with a separate inorganic photoelectric conversion device of the separate plurality of inorganic photoelectric conversion devices, a separate portion of the near infrared organic photoelectric conversion layer, and a separate portion of the common electrode. ### Claim 4 (depends on 3) The pulse oximeter-embedded near infrared organic image sensor of claim 3, further comprising: a signal processor configured to calculate a heart rate and oxygen saturation using an absorbance of near infrared light that is measured by the near infrared organic photoelectric conversion device based on at least a portion of the received light in the particular near infrared wavelength spectrum being absorbed by the near infrared organic photoelectric conversion device, and an absorbance of red light that is measured by the plurality of inorganic red photoelectric conversion devices based on at least a portion of the received light in the particular red wavelength spectrum being absorbed by the plurality of inorganic red photoelectric conversion devices. ### Claim 5 A wearable pulse oximeter, comprising: a light emitting device configured to emit white light having an intensity of about 1 to about 10 mW; and a sensor including a stack of a near infrared organic photoelectric conversion device and an array of inorganic photoelectric conversion devices , the near infrared organic photoelectric conversion device configured to sense a particular near infrared wavelength spectrum of light, the array of inorganic photoelectric conversion devices overlapping separate portions of the near infrared organic photoelectric conversion device, the array of inorganic photoelectric conversion devices including a red inorganic photoelectric conversion device configured to sense a particular red wavelength spectrum of light, a blue inorganic photoelectric conversion device configured to sense a particular blue wavelength spectrum of light, and a green inorganic photoelectric conversion device configured to sense a particular green wavelength spectrum of light. ### Claim 6 (depends on 5) The wearable pulse oximeter of claim 5, further comprising: a signal processor configured to calculate a heart rate and oxygen saturation using an absorbance of near infrared light that is measured by the near infrared organic photoelectric conversion device based on at least a portion of incident light in the particular near infrared wavelength spectrum being absorbed by the near infrared organic photoelectric conversion device, and an absorbance of red light that is measured by the red inorganic photoelectric conversion device based on at least a portion of the incident light in the particular red wavelength spectrum being absorbed by the red inorganic photoelectric conversion device. ### Claim 7 (depends on 5) The wearable pulse oximeter of claim 5, further comprising: a flexible display configured to display a signal of the sensor. ### Claim 8 An angiographic device, comprising: a light emitting device configured to emit white light having an intensity of about 1 to about 10 mW to irradiate a blood vessel; a near infrared organic photoelectric conversion device including a near infrared organic photoelectric conversion layer on a semiconductor substrate, a common electrode on the near infrared organic photoelectric conversion layer, and a plurality of pixel electrodes between the near infrared organic photoelectric conversion layer and the semiconductor substrate; and an array of inorganic photoelectric conversion devices embedded in the semiconductor substrate and overlapping separate pixel electrodes of the near infrared organic photoelectric conversion device, separate portions of the near infrared organic photoelectric conversion layer, and separate portions of the common electrode, wherein the array of inorganic photoelectric conversion devices includes a red inorganic photoelectric conversion device configured to sense a particular red wavelength spectrum of light, a blue inorganic photoelectric conversion device configured to sense a particular blue wavelength spectrum of light, and a green inorganic photoelectric conversion device configured to sense a particular green wavelength spectrum of light, and wherein the inorganic red photoelectric conversion device is configured to sense the particular red wavelength spectrum of light of transmitted light that is received from the light emitting device, subsequently to the transmitted light having irradiated the blood vessel, and the near infrared organic photoelectric conversion device is configured to sense a particular near infrared wavelength spectrum of light of the transmitted light. ### Claim 9 (depends on 8) The angiographic device of claim 8, further comprising: a signal processor configured to calculate a heart rate and oxygen saturation using an absorbance of near infrared light that is measured by the near infrared organic photoelectric conversion device based on at least a portion of the transmitted light in the particular near infrared wavelength spectrum being absorbed by the near infrared organic photoelectric conversion device, and an absorbance of red light that is measured by the of inorganic red photoelectric conversion device based on at least a portion of the transmitted light in the particular red wavelength spectrum being absorbed by the inorganic red photoelectric conversion device. ### Claim 10 A smart phone, comprising: a light emitting device configured to emit white light to irradiate a blood vessel; and a pulse oximeter-embedded near infrared organic image sensor configured to detect transmitted light transmitted from the light emitting device, subsequently to the transmitted light having irradiated the blood vessel, the pulse oximeter-embedded near infrared organic image sensor including an array of inorganic photoelectric conversion devices embedded in a semiconductor substrate and at least partially defining a plurality of unit pixels, the array of inorganic photoelectric conversion devices including a plurality of inorganic red photoelectric conversion devices configured to sense a particular red wavelength spectrum of light, a plurality of inorganic blue photoelectric conversion devices configured to sense a particular blue wavelength spectrum of light, and a plurality of inorganic green photoelectric conversion devices configured to sense a particular green wavelength spectrum of light, a near infrared organic photoelectric conversion layer on the array of inorganic photoelectric conversion devices embedded in the semiconductor substrate, the near infrared organic photoelectric conversion layer configured to absorb a particular near infrared wavelength spectrum of light, a common electrode on the near infrared organic photoelectric conversion layer, and an array of pixel electrodes between the near infrared organic photoelectric conversion layer and the semiconductor substrate, wherein each separate unit pixel of the plurality of unit pixels of the pulse oximeter-embedded near infrared organic image sensor includes a separate plurality of inorganic photoelectric conversion devices of the array of inorganic photoelectric conversion devices, the separate plurality of inorganic photoelectric conversion devices including a separate red inorganic photoelectric conversion device of the plurality of inorganic red photoelectric conversion devices, a separate blue inorganic photoelectric conversion device of the plurality of inorganic blue photoelectric conversion devices, and a separate green inorganic photoelectric conversion device of the plurality of inorganic green photoelectric conversion devices, and separate pixel electrodes of the array of pixel electrodes that are each overlapped with a separate inorganic photoelectric conversion device of the separate plurality of inorganic photoelectric conversion devices, a separate portion of the near infrared organic photoelectric conversion layer, and a separate portion of the common electrode. ### Claim 11 (depends on 10) The smart phone of claim 10, further comprising: a signal processor configured to calculate a heart rate and oxygen saturation using an absorbance of near infrared light that is measured by the pulse oximeter-embedded near infrared organic image sensor based on at least a portion of the transmitted light in the particular near infrared wavelength spectrum being absorbed by the near infrared organic photoelectric conversion layer, and an absorbance of red light that is measured by the pulse oximeter-embedded near infrared organic image sensor based on at least a portion of the transmitted light in the particular red wavelength spectrum being absorbed by the plurality of inorganic red photoelectric conversion devices. ### Claim 12 A pulse oximeter, comprising: a light emitting device configured to emit white light having an intensity of about 1 to about 10 mW; and a sensor configured to detect at least a particular limited wavelength portion of the white light that is emitted by the light emitting device, the sensor including a near infrared organic photoelectric conversion device on a semiconductor substrate, the near infrared organic photoelectric conversion device configured to sense a particular near infrared wavelength spectrum of light, and an array of inorganic photoelectric conversion devices embedded in the semiconductor substrate, the array of inorganic photoelectric conversion devices including a red inorganic photoelectric conversion device configured to sense a particular red wavelength spectrum of light, a blue inorganic photoelectric conversion device configured to sense a particular blue wavelength spectrum of light, and a green inorganic photoelectric conversion device configured to sense a particular green wavelength spectrum of light, wherein each separate inorganic photoelectric conversion device of the array of inorganic photoelectric conversion devices is overlapped with a separate portion of the near infrared organic photoelectric conversion device. ### Claim 13 (depends on 12) The pulse oximeter of claim 12, further comprising: a signal processor configured to calculate a heart rate and oxygen saturation based on a determination of an absorbance of near infrared light that is measured by the near infrared organic photoelectric conversion device based on at least a portion of the white light that is emitted by the light emitting device in the particular near infrared wavelength spectrum being absorbed by the near infrared organic photoelectric conversion device, and an absorbance of red light that is measured by the red inorganic photoelectric conversion device based on at least a portion of the white light that is emitted by the light emitting device in the particular red wavelength spectrum being absorbed by the red inorganic photoelectric conversion device.