CN109309117B - Heart rate sensing display device and intelligent wearable device - Google Patents
Heart rate sensing display device and intelligent wearable device Download PDFInfo
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- CN109309117B CN109309117B CN201811152354.2A CN201811152354A CN109309117B CN 109309117 B CN109309117 B CN 109309117B CN 201811152354 A CN201811152354 A CN 201811152354A CN 109309117 B CN109309117 B CN 109309117B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/856—Arrangements for extracting light from the devices comprising reflective means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
Abstract
The embodiment of the invention discloses a heart rate sensing display device, a heart rate detection method and intelligent wearable equipment, relates to the technical field of heart rate detection, and aims to solve the problem of lightness and thinness of the intelligent wearable equipment. The heart rate sensing display device comprises an active light-emitting back plate; the packaging side of the active light-emitting back plate is provided with a transflective layer, and the substrate side of the active light-emitting back plate is provided with at least one light detection sensing module; the transflective layer is used for being in a transmission mode in a display stage and being in a reflection mode in a heart rate detection stage, and the emergent light of the active light-emitting back plate is reflected to a target part to be detected as a light detection signal; the light detection sensing module is used for collecting a reflected light signal formed after the part to be measured of the measurement target is irradiated by the light detection signal. The heart rate sensing display device, the heart rate detection method and the intelligent wearable device provided by the embodiment of the invention are used for detecting the heart rate of a user.
Description
Technical Field
The invention relates to the technical field of heart rate detection, in particular to a heart rate sensing display device and intelligent wearable equipment.
Background
Along with the rapid development of intelligent wearing equipment, it has become one of its mainstream development trends to set up heart rate sensor in intelligent wearing equipment especially intelligent bracelet or intelligent wrist-watch. The intelligent bracelet or the intelligent watch utilizes the heart rate sensor, and the heart rate state of the user can be monitored in real time from the wrist of the user, so that the health state of the body of the user can be fed back in real time in the daily life of the user.
However, for convenience of the wrist of the user directly contacting or irradiating the heart rate sensor, the current heart rate sensor often needs to be independently arranged on the back of the smart bracelet or the smart watch, so that the thickness of the smart bracelet or the smart watch is large, and the smart bracelet or the smart watch is not light and thin.
Disclosure of Invention
The embodiment of the invention aims to provide a heart rate sensing display device, a heart rate detection method and intelligent wearable equipment, so as to realize the lightness and thinness of the intelligent wearable equipment.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a first aspect of an embodiment of the present invention provides a heart rate sensing display device, including an active light-emitting backplane; the packaging side of the active light-emitting back plate is provided with a transflective layer, and the substrate side of the active light-emitting back plate is provided with at least one light detection sensing module; the transflective layer is used for being in a transmission mode in a display stage and being in a reflection mode in a heart rate detection stage, and the emergent light of the active light-emitting back plate is reflected to a target part to be detected as a light detection signal; the light detection sensing module is used for collecting a reflected light signal formed after the part to be measured of the measurement target is irradiated by the light detection signal.
According to the heart rate sensing display device provided by the embodiment of the invention, the transflective layer is arranged on the packaging side of the active light-emitting back plate, the transflective layer can be in a transmission mode in the display stage so as to realize the display of the heart rate sensing display device, the transflective layer is in a reflection mode in the heart rate detection stage so as to reflect emergent light of the active light-emitting back plate to a target part to be detected, and a light detection sensing module is used for collecting and measuring a reflected light signal formed after the target part to be detected is irradiated by a light detection signal so as to realize the detection function of the heart rate sensing display device. Therefore, the embodiment of the invention can utilize the active light-emitting back plate as the heart rate detection light source, and carry out heart rate detection on the user through the transparent and reflective layer arranged at the packaging side of the active light-emitting back plate and the light detection sensing module arranged at the substrate side of the active light-emitting back plate on the premise of not influencing the display function of the active light-emitting back plate, so that a heart rate sensing device comprising the heart rate detection light source does not need to be independently arranged outside the active light-emitting back plate, and thus when the heart rate sensing display device provided by the embodiment of the invention is installed in intelligent wearable equipment, the thickness of the intelligent wearable equipment can be effectively reduced, and the realization of the lightness and thinness of the intelligent wearable equipment is facilitated.
Optionally, the active light-emitting backplane comprises an OLED backplane; the OLED backboard comprises a substrate and a plurality of pixel units arranged on the substrate in an array manner; the pixel units comprise at least one multiplexing pixel unit used for emitting light in a display stage and a heart rate detection stage; a light transmission part is arranged between the multiplexing pixel unit and at least one adjacent pixel unit and used for enabling the light transmission and reflection layer to reflect emergent light of the multiplexing pixel unit to a target part to be detected as a light detection signal in a heart rate detection stage.
Optionally, the orthographic projection area of the multiplexing pixel unit on the substrate is a1The light transmission part corresponding to the multiplexing pixel unit has an area A on the front projection of the substrate2(ii) a Wherein A is2/A1＝a，5％≤a≤25％。
Optionally, the pixel unit includes a pixel driving circuit and a pixel defining layer sequentially formed on the substrate, and an OLED connected to the pixel driving circuit is disposed in an opening area of the pixel defining layer. The light-transmitting part and the pixel defining layer are integrally formed; or, the light-transmitting portion includes: a first light-transmitting layer integrally formed with at least one light-transmitting functional film layer in the pixel driving circuit, and a second light-transmitting layer integrally formed with the pixel defining layer.
Optionally, the OLED of the multiplexing pixel unit includes a green OLED.
Optionally, the transflective layer includes a first electrode layer and a second electrode layer disposed oppositely, and cholesteric liquid crystal filled between the first electrode layer and the second electrode layer.
Optionally, the electrode layer facing the active light-emitting backplane in the first electrode layer and the second electrode layer includes a conductive glass electrode layer; the thickness of the conductive glass electrode layer is less than or equal to 0.5 mm.
Optionally, the heart rate sensing display device further comprises a display cover plate; the transflective layer is integrated on the surface of the display cover plate facing the active light-emitting back plate.
Optionally, the optical detection sensing module includes a PIN photodiode; and the PIN photodiode is integrated on the surface of the active light-emitting back plate, which is far away from the transflective layer.
Based on the technical scheme of the heart rate sensing display device, a second aspect of the embodiment of the invention provides intelligent wearable equipment, and the intelligent wearable equipment comprises the heart rate sensing display device provided by the technical scheme. The beneficial effects that the intelligent wearable device provided by the embodiment of the invention can achieve are the same as those that the heart rate sensing display device provided by the technical scheme can achieve, and are not repeated herein.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a heart rate sensing display device according to an embodiment of the present invention;
fig. 2a, fig. 2b and fig. 2c are schematic diagrams of three distributions of the light-transmitting portion according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another heart rate sensing display device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a mode change of a transflective layer in the heart rate sensing display device of FIG. 3;
FIG. 5 is a schematic representation of the reflectivity of the transflective layer of FIG. 4 in a reflective mode;
fig. 6 is a schematic structural diagram of a light detection sensing module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a housing of an intelligent wearable device according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of a heart rate detection method according to an embodiment of the present invention.
Reference numerals:
1-OLED backplane, 11-substrate base plate, 12-pixel drive circuit,
13-OLED, 14 encapsulating layer, 2-transflective layer,
21-a first electrode layer, 22-cholesteric liquid crystal, 23-a second electrode layer,
3-a light detection sensing module, 31-a third electrode layer, 32-a PIN layer,
33-a fourth electrode layer, 4-a target part to be measured, 5-a display cover plate,
6-housing, 61-light source opening, 62-sensing module opening,
7-multiplexing pixel unit, 8-light transmission part.
Detailed Description
For convenience of understanding, the heart rate sensing display device, the heart rate detection method and the intelligent wearable device provided by the embodiment of the invention are described in detail below with reference to the drawings of the specification.
Referring to fig. 1 to 3, an embodiment of the invention provides a heart rate sensing display device, which includes an active light-emitting back plate; the packaging side of the active light-emitting back plate is provided with a transflective layer 2, and the substrate side of the active light-emitting back plate is provided with at least one light detection sensing module 3; the transflective layer 2 is used for being in a transmission mode in a display stage and being in a reflection mode in a heart rate detection stage, so that emergent light rays of the active light-emitting back plate are reflected to a target part to be detected 4 as light detection signals; the light detection sensing module 3 is used for collecting a reflected light signal formed after the portion 4 to be measured of the measurement target is irradiated by the light detection signal.
The active Light-Emitting backplane generally includes an Organic Light-Emitting diode (OLED) backplane 1, or other backplanes capable of actively Emitting Light for display, such as Quantum Dot Light Emitting Diodes (QLED) backplane.
In the present embodiment, the active light-emitting backplane is an OLED backplane 1; the OLED backplane 1 generally adopts a top-emitting structure, and includes a substrate 11 and a plurality of pixel units arranged on the substrate 11 in an array; the substrate side of the OLED backplane 1 refers to a side of the OLED backplane 1 where the substrate 11 is disposed, and specifically may be a side of the substrate 11 departing from the encapsulation layer 14, or a surface of the substrate 11 facing the encapsulation layer 14; the encapsulation side of the OLED backplane 1 specifically refers to the side of the OLED backplane 1 provided with the encapsulation layer 14, and generally represents the light-emitting side of the OLED backplane 1 emitting light from the top.
With reference to fig. 2a, fig. 2b and fig. 2c, in the OLED backplane 1, the plurality of pixel units includes at least one multiplexing pixel unit 7 for emitting light in the display phase and the heart rate detection phase, that is, the multiplexing pixel unit 7 can be multiplexed as a heart rate detection light source in addition to being used as a display light source. The number of multiplexing pixel units 7 can be set according to actual needs; a light-transmitting part 8 should be arranged between each multiplexing pixel unit 7 and at least one adjacent pixel unit, that is, at least one side of each multiplexing pixel unit 7 is provided with the light-transmitting part 8, so that the light-transmitting part 8 is used for the light-transmitting and reflecting layer 2 to reflect the emergent light of the corresponding multiplexing pixel unit 7 as a light detection signal to the target to-be-measured part 4 in the phase of heart rate detection.
The heart rate sensing display device provided by the embodiment of the invention is used for detecting the heart rate state of a user, and the target part to be detected 4 generally refers to a wrist, a neck and other parts capable of acquiring blood changes of the user through optical detection signals. The target site 4 to be measured in this embodiment may be selected as an arm blood vessel of the user.
According to the heart rate sensing display device provided by the embodiment of the invention, the transflective layer 2 is arranged on the packaging side of the OLED backboard 1, the transflective layer 2 can be in a transmission mode in the display stage so as to realize the display of the heart rate sensing display device, the transflective layer 2 is in a reflection mode in the detection mode so as to reflect the emergent light of the multiplexing pixel unit 7 in the OLED backboard 1 to the target part to be detected 4, and the light detection sensing module 3 is used for collecting and measuring the reflected light signal formed after the target part to be detected 4 is irradiated by the light detection signal so as to realize the detection function of the heart rate sensing display device. Therefore, the embodiment of the invention can utilize the multiplexing pixel unit 7 in the OLED backboard 1 as the heart rate detection light source, and carry out heart rate detection on the user through the transflective layer 2 integrated on the packaging side of the OLED backboard 1 and the light detection sensing module 3 arranged on the substrate side of the OLED backboard 1 on the premise of not influencing the display function of the OLED backboard 1, so that a heart rate sensing device comprising the heart rate detection light source does not need to be independently arranged outside the OLED backboard 1, and thus when the heart rate sensing display device provided by the embodiment of the invention is installed in the intelligent wearable equipment, the thickness of the intelligent wearable equipment can be effectively reduced, and the intelligent wearable equipment is light and thin.
It should be added that the light-transmitting part 8 is arranged at the interval between the multiplexing pixel unit and the adjacent pixel unit in the OLED backplane 1, so as to avoid the adverse effect on the display effect of the OLED backplane 1, the light-transmitting area of the light-transmitting part 8 should not be too large, and the present embodiment limits the area ratio between the light-transmitting part 8 and the corresponding multiplexing pixel unit 7; illustratively, the multiplex pixel cell 7 has an orthographic projection area A on the substrate 111The light transmission section 8 corresponding to the multiplexed pixel unit 7 has an area a on the front projection of the substrate 112When the ratio of the two is A2/A1And a is more than or equal to 5% and less than or equal to 25%. Of course, if the light-transmitting portion 8 is classified as a component of the corresponding multiplexed pixel unit 7, the area ratio of the light-transmitting portion 8 in the corresponding multiplexed pixel unit 7 is optimally about 5% to 20%. The shape of the light transmitting portion 8 may be set as needed, for example, a long shape or a cylindrical shape.
It is understood that each pixel unit of the above-mentioned OLED backplane 1 generally includes a pixel driving circuit 12 and a pixel defining layer sequentially formed on a substrate 11, an opening area of the pixel defining layer is provided with an OLED13 connected with the pixel driving circuit 12, and the surface of the pixel defining layer and the OLED13 facing away from the substrate 11 is provided with an encapsulation layer 14. The pixel driving circuit 12 is generally formed by connecting a plurality of thin film transistors and capacitors in series and parallel, and when the pixel driving circuit 12 is manufactured, each electrode layer and a light-transmitting functional film layer insulated from each electrode layer in correspondence with each other may be formed on the substrate 11 in sequence according to the structure corresponding to the thin film transistors.
The light-transmitting portion 8 is generally made of a light-transmitting resin material, and various specific methods are possible. Illustratively, the light-transmitting portion 8 is integrally formed with the pixel defining layer, that is, a space for transmitting light is reserved in a portion of the substrate 11 corresponding to the portion between the multiplexing pixel unit 7 and the adjacent pixel unit, and then when the pixel defining layer is fabricated, the space is filled with the portion of the pixel defining layer to form the light-transmitting portion 8. Alternatively, the light-transmitting portion 8 is composed of a first light-transmitting layer integrally formed with at least one light-transmitting functional film layer in the pixel driving circuit 12, and a second light-transmitting layer integrally formed with the pixel defining layer; that is, when the pixel driving circuit is fabricated on the substrate 11, a first light-transmitting layer may be formed by using a portion of at least one light-transmitting functional film layer, which is correspondingly present in the pixel driving circuit, between the multiplexing pixel unit 7 and the adjacent pixel unit, the light-transmitting functional film layer including a gate insulating layer, an interlayer insulating layer, a planarization layer, or the like, and then, when the pixel defining layer is fabricated, a second light-transmitting layer may be formed by using a portion of the pixel defining layer between the multiplexing pixel unit 7 and the adjacent pixel unit, and the light-transmitting portion 8 may be formed by laminating the first light-transmitting layer and the second light-transmitting layer.
Of course, when the light-transmitting portion 8 is formed by laminating a first light-transmitting layer and a second light-transmitting layer, if the first light-transmitting layer is formed by laminating a plurality of light-transmitting functional film layers, and each light-transmitting functional film layer and each second light-transmitting layer are made of different materials, that is, each light-transmitting functional film layer and each second light-transmitting layer have different refractive indexes, it is preferable that the refractive indexes of the second light-transmitting layer and each light-transmitting functional film layer are sequentially increased along the direction in which the transflective layer 2 points to the substrate 11; can be in the in-process that the outgoing light that passes through anti-layer 2 will correspond multiplexing pixel unit 7 reflects to target position 4 that awaits measuring as the light detect signal like this, constantly gather together the light detect signal to ensure that the light detect signal has great luminous intensity after reflecting to target position 4 that awaits measuring, thereby carry out accurate detection to the rhythm of the heart of target position 4 that awaits measuring.
It should be mentioned that the heart rate sensing and displaying device provided in this embodiment mostly adopts the optical pulse measurement technology to perform heart rate detection; the OLED of the multiplexing pixel unit 7 in the heart rate sensing display device is preferably a green OLED. Because the blood of the user is red, the blood can reflect red light and absorb green light, at the moment of heartbeat of the user, along with the increase of the blood volume at the wrist of the user, the green light emitted by the green OLED in the multiplexing pixel unit 7 can be absorbed in a large amount, and corresponding to the interval of two heartbeats of the user, the blood volume at the wrist of the user can be relatively less, and the absorption volume of the green light emitted by the green OLED in the multiplexing pixel unit 7 is relatively less, so that the heart rate of the user can be obtained by detecting the heartbeat times of the user within a certain time; compare with the OLED of other light-emitting colors, this embodiment utilizes green light OLED's emergent green light among the multiplexing pixel unit 7, can pass through the green light in the different states of user's heartbeat and differ great absorbed quantity, effectively reduces the SNR to acquire better heart rate detection effect.
It should be noted that the above-mentioned OLED backplane 1 generally adopts an RGB color display mode, that is, the OLED of each pixel unit in the OLED backplane 1 includes three types, namely a red OLED, a green OLED and a blue OLED; the pixel unit where the green light OLED is located serves as the multiplexing pixel unit 7 and can emit light in both a display stage and a heart rate detection stage; the red OLED and the blue OLED are used to emit light as a display light source during a display phase and not emit light during a heart rate detection phase. According to the embodiment, the green OLED in the OLED backboard 1 is selected as the display light source and the heart rate detection light source, the red OLED and the blue OLED are controlled not to emit light in the heart rate detection stage, and the power consumption of the heart rate sensing display device can be effectively reduced.
In addition, if the OLEDs of each pixel unit in the OLED backplane 1 all adopt green OLEDs, each pixel unit can be used as a multiplexing pixel unit; in order to ensure that the heart rate sensing display device adopting the structure can perform full-color display in the display stage, the embodiment further needs to arrange a color filter on the packaging side of the OLED backplane 1.
In some embodiments, in order to facilitate manufacturing and improve production efficiency, optionally, the heart rate sensing display device further includes a display cover plate 5; the transflective layer 2 is integrated on the surface of the display cover plate 5 facing the active light emitting backplane, i.e. the OLED backplane 1. After the OLED backplane 1 and the display cover 5 provided with the transflective layer 2 are manufactured, the display cover 5 provided with the transflective layer 2 can be well encapsulated with the OLED backplane 1 by the encapsulation layer 14 of the OLED backplane 1.
It should be noted that the transflective layer 2 is also called as a transflective layer for switching between two different modes of the display phase transmission and the heart rate detection phase reflection, and the transflective layer 2 can be made of a transflective liquid crystal or an electrochromic material. Exemplarily, referring to fig. 3, the transflective layer 2 includes a first electrode layer 21 and a second electrode layer 23 disposed opposite to each other, and cholesteric liquid crystal 22 filled between the first electrode layer 21 and the second electrode layer 23; the first electrode layer 21 and the second electrode layer 23 are used for controlling the molecular deflection state of the cholesteric liquid crystal 22, the first electrode layer 21 and the second electrode layer 23 can be made of the same or different transparent conductive materials, and the first electrode layer 21 and the second electrode layer 23 are respectively connected with voltage driving ends with different polarities.
When the transflective layer 2 is integrated on the surface of the display cover plate 5, the display cover plate 5 can be used as a substrate on one side of the transflective layer 2, i.e. a light-transmitting conductive film can be directly coated on the surface of the display cover plate 5 facing the OLED backplane 1 to form the second electrode layer 23 shown in fig. 3. That is to say, in the heart rate sensing display device provided in this embodiment, when the transflective layer 2 adopts a transflective liquid crystal structure, the electrode layer facing the active light-emitting backplane, that is, the OLED backplane 1, in the first electrode layer and the second electrode layer may be made of conductive glass, and the electrode layer facing the display cover plate 5 in the first electrode layer and the second electrode layer may be made of a light-transmitting conductive film. In order to ensure that the transflective layer 2 has a small thickness, the thickness of the conductive glass electrode layer formed by using the conductive glass is generally less than or equal to 0.5 mm, for example, 0.2 mm.
The cholesteric liquid crystal 22 has two modes of transmission and reflection, and can be divided into a pyramidal state and a planar state according to the state of deflection of liquid crystal molecules. Referring to fig. 4, the cholesteric liquid crystal is in an angular cone state as shown in fig. 4 (a), that is, when the voltage difference between the first electrode layer 21 and the second electrode layer 23 at two sides of the cholesteric liquid crystal is 0V, the cholesteric liquid crystal is in a transmission mode, and can make the emergent light of the OLED backplane 1 transmit, and the optical transmittance is high>87 percent; the cholesteric liquid crystal is in a planar state as shown in fig. 4 (b), that is, when the voltage difference between the first electrode layer 21 and the second electrode layer 23 on both sides of the cholesteric liquid crystal is not 0V, the cholesteric liquid crystal is in a reflective mode, and can reflect the emergent light of the OLED backplane 1 to the target part 4 to be measured, and the optical reflectivity is greater than or equal to 87%. In the present embodiment, when cholesteric liquid crystal is used as the transflective layer 2, the reflectance of the transflective layer 2 for visible light with different wavelengths is shown in fig. 5; wherein, V2＞V1＞V0And V is the voltage between the first electrode layer 21 and the second electrode layer 23 on two sides of the cholesteric liquid crystalAnd (4) poor.
The cholesteric liquid crystal is generally formed by mixing liquid crystal molecules and a chiral dopant. Wherein, the liquid crystal molecules can be composed of at least one of the following compounds:
first, a polytropic ring liquid crystal compound; such as:
a second type, tolane-type liquid crystal compounds; such as:
a third, polyacetylene-based liquid crystal compound; such as:
a fourth type, diphenyl diyne liquid crystal compounds; such as:
in the above compounds, F represents a fluorine atom, C represents a carbon atom, and X, Y, R, R' represents an atom or a group, respectively, such as a carbon (C) atom, an oxygen (O) atom, a nitrogen (N) atom, a hydrogen (H) atom, a hydrocarbon group, an aromatic group, etc.
The chiral admixture may be composed of at least one of the following compounds:
in the first kind of the method, the first,
in the second type of the above-mentioned methods,
in a third aspect of the present invention,
in the fourth kind of the method, the first,
in the fifth type of the above-mentioned method,
in the sixth type of the above-mentioned method,
in the above compounds, F represents a fluorine atom, C represents a carbon atom, O represents an oxygen atom, and n represents the number of the corresponding groups.
It is understood that, referring to fig. 6, the light detection sensing module 3 may use a PIN photodiode; the PIN photodiode generally includes a third electrode layer 31, a PIN layer 32, and a fourth electrode layer 33, which are stacked in this order. The PIN photodiode is arranged on the substrate side of the active light-emitting back plate, and can be specifically integrated on the surface of the active light-emitting back plate, namely the surface of the OLED back plate 1 departing from the transflective layer 2, namely the surface of the substrate 11 in the OLED back plate 1 departing from the packaging layer 14; or integrated on the surface of the substrate 11 facing the packaging layer 14; the heart rate sensing display device can be manufactured and molded independently and is arranged on the outer side of the shell of the intelligent wearable device where the heart rate sensing display device is located; the specific installation position of the light detection sensing module 3 is not limited in this embodiment, and the reflected light signal formed after the target site to be measured 4 is irradiated by the light detection signal can be received.
When the PIN photodiode is separately manufactured and molded, glass, plastic or a flexible Polyimide film (PI) may be used as a substrate, and then the third electrode layer 31, the PIN layer 32 and the fourth electrode layer 33 are sequentially formed on the substrate. In addition, the third electrode layer 31 and the fourth electrode layer 33 of the PIN diode do not need patterning processing, and the PIN diode can be respectively led out and connected into a control circuit board of the intelligent wearable device for use.
When the heart rate sensing display device provided by the embodiment of the invention is used, a heart rate detection method is shown in fig. 8, and comprises the following steps:
step S1, the heart rate sensing display device is started to enter a heart rate detection stage, and the transflective layer of the heart rate sensing display device enters a reflection mode.
When the transflective layer adopts a transflective liquid crystal structure, the liquid crystal of the transflective layer can be controlled to deflect to a reflective mode by applying voltage to the electrode of the transflective liquid crystal structure so as to reflect incident light.
And step S2, driving the multiplexing pixel units of the active light-emitting back plate in the heart rate sensing display device to emit light, and reflecting emergent light rays corresponding to the multiplexing pixel units to the target part to be detected as light detection signals by the transflective layer.
The target part to be measured generally refers to a part such as a wrist or a neck, which can acquire blood changes of a user through an optical detection signal; the target region to be measured in this embodiment is specifically represented as an arm blood vessel of the user.
In step S3, the light detection sensing module collects a reflected light signal formed after the measurement target to-be-measured portion is irradiated by the light detection signal, and obtains heart rate detection data.
The optical detection sensing module adopts a PIN photodiode; the PIN photodiode can convert a reflected light signal into a current signal by acquiring the reflected light signal formed after the light detection signal is reflected by the target part to be detected, and output the current signal to a control circuit board of the heart rate sensing display device, so that the control circuit board can record and measure the heart rate, and the heart rate detection of a user is completed; of course, the control circuit board can also store heart rate detection data of the user and display the heart rate detection data according to the requirements of the user after the heart rate sensing display device enters a display stage.
The embodiment of the invention also provides intelligent wearing equipment, and the heart rate sensing display device provided by the embodiment is installed in the shell of the intelligent wearing equipment. The beneficial effects that the intelligent wearable device provided by the embodiment of the invention can achieve are the same as those that the heart rate sensing display device provided by the embodiment of the invention can achieve, and are not repeated herein.
For example, please refer to fig. 7, in this embodiment, the smart wearable device includes a smart band or a smart watch. The bottom of the shell of the intelligent bracelet or the intelligent watch, namely the structure of the shell which is in contact with the arm of a user and corresponds to the heart rate sensing display device, is respectively provided with at least one light source opening 61 and at least one sensing module opening 62; the light source opening 61 is used for allowing the light detection signal reflected by the transflective layer to pass through and ensuring that the light detection signal irradiates a target part to be detected of a user; the opening 62 of the sensing module is used for allowing the reflected light signal formed after the target to-be-measured portion is irradiated by the light detection signal to pass through, and ensuring that the reflected light signal is irradiated to the light detection sensing module, so that the light detection sensing module can collect and measure the reflected light signal. The number, properties and arrangement positions of the light source openings 61 and the sensing module openings 62 can be set according to actual needs, and this embodiment is not particularly limited.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A heart rate sensing display device is characterized by comprising an active light-emitting back plate; the packaging side of the active light-emitting back plate is provided with a transflective layer, and the substrate side of the active light-emitting back plate is provided with at least one light detection sensing module; wherein the content of the first and second substances,
the transflective layer is used for being in a transmission mode in a display stage and being in a reflection mode in a heart rate detection stage so as to reflect emergent light of the active light-emitting back plate to a target part to be detected as a light detection signal;
the light detection sensing module is used for collecting and measuring a reflected light signal formed after the target part to be detected is irradiated by the light detection signal;
the active light emitting backplane comprises an OLED backplane; the OLED backboard comprises a substrate and a plurality of pixel units arranged on the substrate in an array manner; the pixel units comprise at least one multiplexing pixel unit used for emitting light in a display stage and a heart rate detection stage;
a light-transmitting part is arranged between the multiplexing pixel unit and at least one adjacent pixel unit; the pixel unit comprises a pixel driving circuit and a pixel defining layer which are sequentially formed on the substrate; the light-transmitting part comprises a first light-transmitting layer and a second light-transmitting layer, wherein the first light-transmitting layer is integrally formed with at least one light-transmitting functional film layer in the pixel driving circuit, and the second light-transmitting layer is integrally formed with the pixel defining layer;
the light transmission part is used for enabling the light transmission and reflection layer to reflect emergent light of the multiplexing pixel unit to a target part to be detected as a light detection signal in a heart rate detection stage.
2. The heart rate sensing display device of claim 1, wherein the multiplexed pixel cells have an orthographic projection area A on the substrate1And the light transmission part corresponding to the multiplexing pixel unit has an area A on the front projection of the substrate2(ii) a Wherein A is2/ A1=a，5%≤a≤25%。
3. The heart rate sensing display device according to claim 1, wherein the open area of the pixel defining layer is provided with an OLED connected to the pixel driving circuit;
the light-transmitting portion is integrally formed with the pixel defining layer.
4. The heart rate sensing display device of any one of claims 1-3, wherein the OLEDs of the multiplexed pixel cells comprise green OLEDs.
5. The heart rate sensing display device according to claim 1, wherein the transflective layer includes a first electrode layer and a second electrode layer which are oppositely disposed, and cholesteric liquid crystal filled between the first electrode layer and the second electrode layer.
6. The heart rate sensing display device of claim 5, wherein the one of the first and second electrode layers facing the active light-emitting backplane comprises a conductive glass electrode layer; the thickness of the conductive glass electrode layer is less than or equal to 0.5 mm.
7. Heart rate sensing display device according to claim 1,
the heart rate sensing display device also comprises a display cover plate;
the transflective layer is integrated on the surface of the display cover plate facing the active light-emitting back plate.
8. Heart rate sensing display device according to claim 1,
the optical detection sensing module comprises a PIN photodiode;
the PIN photodiode is integrated on the surface of the active light-emitting back plate, which is far away from the transflective layer.
9. An intelligent wearable device, characterized by comprising a heart rate sensing display device according to any one of claims 1-8.
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| CN109860220B (en) * | 2019-03-28 | 2021-11-09 | 京东方科技集团股份有限公司 | Semiconductor device, manufacturing method thereof and wearable equipment |
| CN109920835B (en) * | 2019-03-28 | 2021-01-29 | 京东方科技集团股份有限公司 | Display substrate, manufacturing method thereof, brightness compensation method and display device |
| CN110164847B (en) * | 2019-05-28 | 2021-03-05 | 京东方科技集团股份有限公司 | Array substrate, light detection method and assembly and display device |
| CN110367964A (en) * | 2019-07-23 | 2019-10-25 | 华一生物科技有限公司 | A kind of biology feedback device |
| CN110518149B (en) * | 2019-08-30 | 2021-11-26 | 京东方科技集团股份有限公司 | Display device and display panel |
| CN111129271B (en) * | 2019-12-23 | 2021-08-03 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
| CN111354771B (en) * | 2020-03-10 | 2022-12-27 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN111668213B (en) * | 2020-07-09 | 2023-06-30 | 南方科技大学 | Heart rate detection chip, preparation method thereof and wearable device |
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