Display screen and electronic equipment
By setting a bioelectrode layer on the surface of the touch screen and using a switching device to control its connection with the acquisition circuit, the problem of the bioelectric signal acquisition device affecting the touch function is solved, and efficient acquisition of bioelectric signals and normal use of the touch function are realized.
Patent Information
- Application Number
- CN202411306904.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2026-03-20
AI Technical Summary
In existing electronic devices, the bioelectric signal acquisition device is usually located outside the touch screen, which affects the touch function and makes it impossible to achieve both bioelectric signal acquisition and touch function at the same time.
A bioelectrode layer is set on the surface of the touch screen and connected to the acquisition circuit through a switching device. In detection mode, it is turned on to acquire bioelectric signals, and in non-detection mode, it is turned off to avoid affecting the touch function.
This technology enables the acquisition of bioelectrical signals without affecting the touch functionality, thus improving the ease of use and accuracy of electronic devices.
Smart Images
Figure CN121704716A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic technology, and more particularly to a display screen and an electronic device. Background Technology
[0002] With the development of electronic technology and users' increasing focus on health, health information collection functions have been integrated into electronic devices such as smartwatches and smartphones. For example, smartwatches can be used to collect bioelectrical signals such as electrocardiograms (ECG) and photoplethysmography (PPG). Existing devices for collecting bioelectrical signals are typically based on independent detection electrodes. Taking smartwatches as an example, electrodes are usually placed on the bottom or crown of the watch to collect bioelectrical signals. These electrodes are not placed on the upper surface of the touchscreen because they would form a shielding layer. Placing electrodes on the touchscreen would block the transmitting and receiving electrode circuits of the touch layer inside the touchscreen from acquiring the capacitance value of an external finger, rendering the touchscreen's touch function unusable. Summary of the Invention
[0003] This application provides a display screen and an electronic device for acquiring bioelectrical signals on the surface of a touch screen without affecting the touch screen's touch function.
[0004] In a first aspect, a display screen is provided. The display screen includes a detection area, which includes a display layer, a touch layer, and a bioelectrode layer stacked sequentially. The bioelectrode layer is disposed on the surface of the touch layer away from the display layer. The touch layer includes a plurality of first electrodes and a plurality of second electrodes. The plurality of first electrodes are arranged in rows along a first direction, and the rows of first electrodes are arranged at intervals along a second direction. The plurality of second electrodes are arranged in columns along the second direction, and the columns of second electrodes are arranged at intervals along the first direction. The first direction and the second direction are different. The bioelectrode layer includes a plurality of detection electrodes. The plurality of detection electrodes are arranged in rows along the first direction, and the rows of detection electrodes are arranged at intervals along the second direction. The detection electrodes are used to detect bioelectrical signals when the display screen is in a detection mode. The display screen also includes a plurality of switching devices. The detection electrodes are electrically connected to a data acquisition circuit through the switching devices. The data acquisition circuit is a circuit that receives and processes bioelectrical signals. If the display screen enters the detection mode, the switching devices are turned on. If the display screen enters a non-detection mode, the switching devices are turned off. The detection mode is the mode in which the display screen acquires bioelectrical signals. The operating mode of the display screen other than the detection mode is called the non-detection mode, such as the touch mode.
[0005] The display screen provided in this application embodiment has a bioelectrode layer disposed on the upper surface of the touch screen, which facilitates the user's acquisition of bioelectrical signals, such as electrocardiogram (ECG) and electromyography (EMG). Multiple detection electrodes of the bioelectrode layer are connected to the acquisition circuit via switching devices. When the display screen is in non-detection mode, the switching devices are disconnected, and each detection electrode is independent, not connected to form a complete conductive plane, and does not form a shielding layer, thus not affecting the normal use of the touch function. When the display screen enters detection mode, the switching devices are turned on, and multiple detection electrodes are electrically connected to the acquisition circuit to form a full-surface electrode for bioelectrical signal detection, achieving coexistence of bioelectrical signal detection and touch function.
[0006] In one possible implementation, multiple detection electrodes in the same row are electrically connected, and each row of detection electrodes is electrically connected to the first end of a switching device, the second end of which is electrically connected to the acquisition circuit. In this case, one switching device is set for each row of detection electrodes.
[0007] In one possible implementation, each detection electrode is electrically connected to the first terminal of a switching device, and the second terminal of the switching device is electrically connected to the acquisition circuit. In this case, each detection electrode is provided with a corresponding switching device.
[0008] In one possible implementation, the detection electrode corresponds one-to-one with the first electrode; the projections of the detection electrode and the corresponding first electrode on the display layer overlap, but do not overlap with the projections of other first electrodes on the display layer. The first electrode can transfer the electric field to the detection electrode above it, with minimal impact on other detection electrodes. Therefore, the signals emitted by different first electrodes can be distinguished and will not affect each other. When the display screen implements touch control in mutual capacitance mode, the first electrode can be the transmitting electrode, and the second electrode can be the receiving electrode. After capacitive coupling through the user's finger or other touch object, the second electrode at the corresponding position can detect the change in capacitance, thus distinguishing the second electrode. In mutual capacitance mode, the touch operation such as clicking and sliding by the user's finger or other touch object can be normally recognized, and the touch function can be used normally. When the display screen implements touch control in self-capacitance mode, due to the coupling of the user's finger, the capacitance to ground of the first electrode will change, while the capacitance to ground of other first electrodes will change less. Therefore, the touch function can also be implemented in self-capacitance mode.
[0009] In one possible implementation, the detection electrode has the same shape and size as the corresponding first electrode; the projection of the detection electrode on the display layer coincides with the projection of the corresponding first electrode on the display layer.
[0010] In one possible implementation, for example, when the display screen implements touch control in a self-capacitive mode, the detection electrode and the second electrode correspond one-to-one; the projections of the detection electrode and the corresponding second electrode on the display layer overlap, but do not overlap with the projections of other second electrodes on the display layer. When the capacitance to ground of the second electrode is detected, the electric field is transferred to the detection electrode above it, but the impact on the detection electrodes at other locations is small. Taking finger touch as an example, the electric field will be coupled to the finger through the detection electrode, while the electric field of the second electrode at the location where the finger is not coupled to the finger. Therefore, the position of the finger can be normally identified, as well as touch operations such as clicking and swiping, and the touch function can be used normally.
[0011] In one possible implementation, the detection electrode and the corresponding second electrode have the same shape and size; the projection of the detection electrode on the display layer coincides with the projection of the corresponding second electrode on the display layer.
[0012] In one possible implementation, the detection electrode is made of a transparent conductive material, which can reduce the impact on the display effect of the display layer.
[0013] In one possible implementation, the detection electrode is electrically connected to the switching device via a transparent wire.
[0014] In one possible implementation, the display screen further includes a first isolation layer and a second isolation layer, wherein the first isolation layer is disposed between the display layer and the touch layer; and the second isolation layer is disposed between the touch layer and the bioelectrode layer.
[0015] Secondly, a display screen is provided, the display screen including a detection area, the detection area including a display layer, a touch layer and a bioelectrode layer stacked sequentially, the bioelectrode layer being disposed on the surface of the touch layer away from the display layer; the touch layer including a plurality of first electrodes and a plurality of second electrodes, the plurality of first electrodes being arranged in rows along a first direction, the rows of first electrodes being arranged at intervals along a second direction; the plurality of second electrodes being arranged in columns along the second direction, the columns of second electrodes being arranged at intervals along the first direction; the first direction is different from the second direction; the bioelectrode layer including a plurality of detection electrodes, the plurality of detection electrodes being arranged in columns along the second direction, the columns of detection electrodes being arranged at intervals along the first direction; the detection electrodes are used to detect bioelectrical signals; the display screen also includes a plurality of switching devices, the detection electrodes being electrically connected to a data acquisition circuit through the switching devices, the data acquisition circuit being a circuit for receiving and processing bioelectrical signals; if the display screen enters a detection mode, the plurality of switching devices are turned on; if the display screen enters a non-detection mode, the plurality of switching devices are turned off.
[0016] Thirdly, an electronic device is provided, comprising a processor, a data acquisition circuit, and a display screen as provided in the first aspect and any implementation thereof. The data acquisition circuit is electrically connected to the processor, and the control terminals of a plurality of switching devices are connected to the processor. In response to a user's biometric detection request, the processor controls the plurality of switching devices to turn on, and the display screen enters a detection mode. In response to the completion of biometric detection, the display screen enters the non-detection mode, and the processor controls the plurality of switching devices to turn off. Attached Figure Description
[0017] Figure 1 A schematic diagram of an electronic device provided in an embodiment of this application;
[0018] Figure 2 A structural block diagram of the electronic device provided in the embodiments of this application;
[0019] Figure 3 A schematic diagram of a display screen provided for an embodiment of this application;
[0020] Figure 4 This is a schematic diagram of the electrode distribution of a touch layer provided in an embodiment of this application;
[0021] Figure 5 A cross-sectional schematic diagram of the display screen provided in an embodiment of this application;
[0022] Figure 6 A schematic diagram of the detection area and non-detection area of the display screen provided in an embodiment of this application;
[0023] Figure 7 A schematic diagram of the bioelectrode layer provided in the embodiments of this application;
[0024] Figure 8 This is a partial structural diagram of a display screen provided in an embodiment of this application;
[0025] Figure 9 A schematic diagram of the circuit structure of a bioelectrode layer provided in an embodiment of this application;
[0026] Figure 10 This is a partial structural schematic diagram of another display screen provided in an embodiment of this application;
[0027] Figure 11 This is a partial structural schematic diagram of another display screen provided in an embodiment of this application;
[0028] Figure 12 A schematic diagram of another bioelectrode layer provided in an embodiment of this application;
[0029] Figure 13 A user interface diagram provided for an embodiment of this application;
[0030] Figure 14 This is a schematic diagram of another user interface provided for an embodiment of this application. Detailed Implementation
[0031] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.
[0032] Hereinafter, the terms "second," "first," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "second," "first," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0033] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" may be defined relative to the orientation in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly based on the orientation of the components in the accompanying drawings.
[0034] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the term "coupled connection" can be a direct electrical connection or an indirect electrical connection through an intermediate medium. The term "contact" can be direct contact or indirect contact through an intermediate medium.
[0035] In this embodiment of the application, "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.
[0036] This application provides an electronic device, for example, combined with Figure 1 The electronic device 10 can be a smartphone 11, a smartwatch 12, a smart bracelet 13, a laptop 14, a tablet computer 15, or a personal computer, a virtual reality (VR) electronic device, an augmented reality (AR) electronic device, an in-vehicle electronic device, etc. This application embodiment does not impose any special limitations on the specific form of the aforementioned electronic device.
[0037] For ease of explanation, we will use a mobile phone as an example below. Figure 2 This is a structural block diagram of an electronic device 20 provided in an embodiment of this application. (See diagram below.) Figure 2 As shown, the electronic device 20 may include one or more of the following components: processor 21, memory 22, and display module 23.
[0038] The processor 21 may include one or more processing cores. The processor 21 connects to various parts within the electronic device 20 using various interfaces and lines. It executes various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 22, and by calling data stored in the memory 22. For example, the processor 21 may be implemented using at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), or programmable logic array (PLA). The processor 21 may integrate one or more of the following: central processing unit (CPU), graphics processing unit (GPU), neural network processing unit (NPU), application processor (AP), and modem. The CPU primarily handles the operating system, user interface, and applications. The GPU is responsible for rendering and drawing the content required to be displayed by the display module 23. The NPU is used to implement artificial intelligence (AI) functions. The modem is used to handle wireless communication. It is understandable that the aforementioned modem may not be integrated into the processor 21, but may be implemented using a separate chip.
[0039] The memory 22 may include random access memory (RAM) or read-only memory (ROM). The memory 22 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 22 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch functionality, bioelectrical signal acquisition functionality, etc.), instructions for implementing the various method embodiments of this application, etc. The data storage area may store data created based on the use of the electronic device 20 (such as audio data, phonebook, acquired bioelectrical signals, etc.).
[0040] Display module 23 is a display component used for displaying images, and is typically located on the light-emitting side of electronic device 20. Display module 23 can be designed as a full-screen, curved screen, irregularly shaped screen, dual-sided screen, or foldable screen, etc. Display module 23 can also be designed as a combination of full-screen and curved screen, or a combination of irregularly shaped screen and curved screen, etc., and this application embodiment does not limit it in this way.
[0041] In some embodiments, continue to refer to Figure 2 The display module 23 includes a display screen 231 and a touch chip 232. Exemplarily, the display screen 231 can be a low-temperature polysilicon (LTPS) display screen, an organic light-emitting diode (OLED) display screen, a low-temperature polycrystalline oxide (LTPO) display screen, a liquid crystal display (LCD), a micro light-emitting diode (micro LED) display screen, etc. Of course, this application embodiment does not limit the type of display screen 231; any display screen with touch display function is applicable to this application embodiment. The above example is merely illustrative.
[0042] The touch chip 232 is used to drive the display screen 231 to receive touch operations (also known as touch events), such as clicks, touches, and swipes. These touch operations can be triggered by the user using any suitable object such as a finger or stylus.
[0043] In addition, those skilled in the art will understand that the above Figure 2The structure of the electronic device 20 shown does not constitute a limitation on the electronic device 20. The electronic device 20 may include more or fewer components than shown, or combine certain components, or have different component arrangements. For example, the electronic device 20 may also include components such as a microphone, speaker, radio frequency circuit, input unit, sensor, audio circuit, wireless fidelity (WiFi) module, power supply, and Bluetooth module, which will not be described in detail here.
[0044] The display screen provided in this application embodiment integrates touch functionality, and the display screen with touch functionality is simply referred to as a touch screen. Figure 3 A schematic diagram of a display screen 30 is shown, which can be... Figure 2 The display screen 30 shown in the figure includes a display layer 31 and a touch layer 32. A first isolation layer 351 is provided between the display layer 31 and the touch layer 32. The display screen 30 may also include more components, which will not be described in detail in this embodiment. The display layer 31 is used for emitting light and displaying, and the touch layer 32 is used for detecting touch operations such as clicking, touching or swiping by the user.
[0045] The touch layer 32 includes a first conductive layer 321, an insulating layer 322, and a second conductive layer 323, sequentially stacked along a direction Z perpendicular to and away from the display layer 31. Figure 4 The first conductive layer 321 includes a plurality of first electrodes, which are arranged in rows along a first direction X. Multiple rows of first electrodes are arranged at intervals along a second direction Y, and the first electrodes in the same row are electrically connected. The second conductive layer 323 includes a plurality of second electrodes, which are arranged in columns along a second direction Y. Multiple columns of second electrodes are arranged at intervals along the first direction X, and the second electrodes in the same column are electrically connected. The figure only shows 5 rows of first electrodes and 7 columns of second electrodes. The touch layer may also include more or fewer first and second electrodes, and the arrangement of the first and second electrodes may be interchanged. This embodiment does not limit this.
[0046] The first and second electrodes are rhomboid or approximately rhomboid in shape. "Approximately rhomboid" means that the shape of the first or second electrode is generally rhomboid, but it is not limited to a standard rhomboid. In some other implementations, the first and second electrodes can also be other shapes, such as rectangles, strips, etc.
[0047] The first direction X and the second direction Y are different. For example, the first direction X and the second direction Y are perpendicular to each other, the first electrode and the second electrode are arranged intersectingly, and each first electrode and the second electrode intersecting with it can form a capacitor through the insulating layer 322.
[0048] The first and second electrodes mentioned above may include transparent conductive materials, thereby reducing the impact on the display effect. For example, the first and second electrodes may be made of transparent conductive materials such as indium tin oxide.
[0049] The display screen can employ either self-capacitive touch detection technology or mutual-capacitive touch detection technology. The following example... Figure 4 Using the structure shown as an example, we will illustrate these two touch detection technologies.
[0050] When using mutual capacitance touch detection technology, the seven columns of second electrodes and the five rows of first electrodes form 35 (5 × 7) mutual capacitances. When a user's finger (or stylus, etc.) touches or slides on the touchscreen, it affects the coupling between the two electrodes (first electrode and second electrode) forming the capacitance near the touch point, thereby changing the capacitance between these two electrodes. The touch chip outputs a scanning signal to the five rows of first electrodes in a time-division manner and simultaneously receives the detection signal from the seven columns of second electrodes. In this case, the first electrode is also called the transmitter (TX), and the second electrode is also called the receiver (RX). Mutual capacitance touch detection technology can obtain the capacitance value at the intersection of all the first and second electrodes. This detection method is called "mutual capacitance detection," which means that the presence of a touch event can be determined based on the change in capacitance value on the two-dimensional plane of the touchscreen, and if a touch event exists, the position of the touch point can be confirmed.
[0051] When using self-capacitive touch detection technology, the mutual capacitance between the first and second electrodes no longer needs to be detected. Only the capacitance to ground of the first electrode and the capacitance to ground of the second electrode are detected. This capacitance is commonly referred to as self-capacitance. In this case, the above-mentioned 5 rows of first electrodes and 7 columns of second electrodes can form 12 (=5+7) self-capacitances. When a user's finger (or stylus, etc.) touches the self-capacitive screen, the capacitance of the finger (or stylus, etc.) will be superimposed on the capacitance of the screen. The touch chip outputs scanning signals to the 5 rows of first electrodes and the 7 columns of second electrodes. By detecting the self-capacitance of the first and second electrodes and based on the capacitance changes before and after the touch, the horizontal and vertical coordinates of the touch position are determined respectively. This detection method is called "self-capacitive detection". That is, the touch point is projected onto the X and Y directions of the touch screen respectively, and then the coordinates of the touch point in the X or Y direction are determined to obtain the position of the touch point on the touch screen.
[0052] In recent years, with the development of electronic technology and users’ attention to health, electronic devices that can detect users’ bioelectrical signals have become best-selling products on the market. For example, wearable devices or smartphones that integrate bioelectrical signal acquisition functions such as blood pressure, heart rate, electrocardiogram, electromyography, and blood oxygen are becoming increasingly popular. The continuous development and progress of this type of product allows users to better understand their own health information and helps them maintain a good health status.
[0053] Current bioelectric signal acquisition devices typically use independent detection electrodes, which are then brought into contact with the user's skin or other body parts to acquire bioelectric signals. Detection electrodes, made of conductive materials, have limited placement options. Taking smartwatches as an example, the common method for placing bio-electrodes is to position them on the bottom, crown, or side of the watch face. Electrodes on the bottom are called bottom electrodes, and those on the crown are called crown electrodes. Users collect bio-information by pressing the crown or side of the watch face in conjunction with the bottom electrode. However, for smartwatches, these electrodes may shift relative to the user's skin during use, affecting signal acquisition. Placing the detection electrodes on the touchscreen, with fingers pressing downwards, would be more stable and accurate than pressing from the side or crown. However, if the entire surface of the touchscreen is covered by detection electrodes, it would form a shielding layer, blocking the internal transmitting and receiving electrodes from receiving signals. This would prevent the touchscreen from recognizing touch operations such as clicks and swipes, affecting the use of touch functionality. Therefore, detection electrodes are typically not placed on the touchscreen, which also impacts the ease of use of this type of electronic device.
[0054] To address the aforementioned issues, this application provides a display screen that integrates a detection electrode for collecting bioelectrical signals onto the display screen. This ensures that the detection electrode for collecting bioelectrical signals does not affect the touch function and can coexist with the touch function of the display screen, thereby improving ease of use.
[0055] Figure 5 This is a cross-sectional schematic diagram of a display screen 30 provided in an embodiment of this application. Figure 6 A schematic diagram of the detection area and non-detection area of the display screen 30 is shown. The display screen 30 includes a detection area and a non-detection area outside the detection area. In some embodiments, combined with Figure 5 and Figure 6 The detection area includes a display layer 31, a touch layer 32, a bioelectrode layer 33 stacked in sequence, and an isolation layer disposed between them. For example, a first isolation layer 351 is disposed between the display layer 31 and the touch layer 32, and a second isolation layer 352 is disposed between the touch layer 32 and the bioelectrode layer 33. The first isolation layer 351 and the second isolation layer 352 are usually made of insulating material.
[0056] Combination Figure 5 As can be seen, the touch layer 32 is positioned above the display layer 31, where "above" refers to the side furthest from the display layer. The bioelectrode layer 33 is positioned above the touch layer 32. To facilitate the acquisition of the user's bioelectrical signals, the bioelectrode layer 33 can typically be positioned on the upper surface of the display screen 30, allowing for easy contact with the user's skin and the acquisition of bioelectrical signals. Since the detection electrodes typically detect bioelectrical signals when the user's finger touches the detection area of the display screen, the detection area can be a fixed area on the screen and does not need to occupy the entire screen. The shape of the detection area can be rectangular, circular, elliptical, or other shapes. For example, the detection area can be set to a size of 2cm × 2cm. The bioelectrode layer 33 includes multiple detection electrodes 331, such as... Figure 7 As shown, multiple detection electrodes 331 are arranged in a row along a first direction X, and multiple rows of detection electrodes 331 are arranged at intervals along a second direction Y. The detection electrodes 331 are used to detect bioelectrical signals when the display screen 30 is in detection mode.
[0057] It should be noted that the detection area can also fill the entire screen, allowing users to touch any area of the screen and flexibly perform bioelectrical signal detection. The specific settings for the detection area can be selected based on the actual product design requirements, and will not be elaborated upon in this application.
[0058] The display screen 30 also includes multiple switching devices (not shown in the figure). The detection electrode 331 is electrically connected to the acquisition circuit through the switching devices. The acquisition circuit is a circuit that receives and processes bioelectric signals. For example, the acquisition circuit can be an integrated analog front end or a discrete analog circuit. If the display screen 30 enters the detection mode in response to a user command, the switching devices are turned on, and each detection electrode 331 is electrically connected to the acquisition circuit. The detection electrodes 331 form a whole electrode for bioelectric signal detection. If the display screen 30 enters the non-detection mode, the switching devices are turned off, and the electrical connection between the detection electrode 331 and the acquisition circuit is broken. At this time, the multiple detection electrodes are insulated from each other to prevent the multiple detection electrodes 331 from forming a shielding layer on a conductive plane, thus avoiding affecting the implementation of the touch function of the display screen.
[0059] It should be noted that the detection mode refers to the mode in which the display screen collects bioelectrical signals. The operating mode of the display screen other than the detection mode is called the non-detection mode. For example, this could be the touch mode.
[0060] The structure and principles of the display layer and touch layer are mature technologies in the industry, and will not be described in detail in the embodiments of this application. The detection electrode 331 detects bioelectrical signals by contacting the user's skin. Each detection electrode 331 is usually made of a transparent conductive material, such as indium tin oxide. Using a transparent conductive material can avoid affecting the display effect of the screen.
[0061] Since the touch function of the display screen can be implemented in different ways, such as mutual capacitance or self-capacitance, the detection electrodes of the bioelectrode layer provided in this application embodiment can also be set in different ways.
[0062] The scanning method of a mutual capacitance screen is line-by-line scanning. In the first line, the first electrode transmits a signal, and then all the second electrodes receive the signal, obtaining the capacitance value at the intersection of the first electrode and all the second electrodes in the first line; then the first electrode in the second line transmits a signal, and all the second electrodes receive the signal, obtaining the capacitance value at the intersection of the first electrode and all the second electrodes in the second line, and so on, until the full screen scan is completed. In this case, the first electrode is also called the transmitting electrode, and the second electrode is also called the receiving electrode.
[0063] To avoid affecting the touch functionality, the arrangement of the detection electrode 331 is roughly the same as the routing of the emitter electrode in the first conductive layer. For example, combined with... Figure 4 and Figure 8 , Figure 8 The relative positions of the detection electrode, the transmitting electrode, and the receiving electrode are shown.
[0064] The detection electrodes 331 are configured in a one-to-one correspondence with the emission electrodes. The detection electrodes 331 can be positioned above the emission electrodes. Here, "above" refers to the side of the emission electrode away from the display layer 31. Being above the emission electrode can mean being directly above it or being offset at a certain angle. In this case, multiple detection electrodes 331 in the same row corresponding to the emission electrodes are electrically connected, thus creating a one-to-one correspondence between multiple rows of detection electrodes and multiple rows of emission electrodes.
[0065] The detection electrode is positioned above its corresponding emitting electrode. The size of the detection electrode can be the same as or smaller than the emitting electrode. When a row of emitting electrodes emits a signal, it transmits an electric field to the detection electrode 331 above it, but has very little effect on the detection electrodes 331 at other positions, for example... Figure 8When the transmitting electrode TX1 transmits a signal, the detection electrode 3311 can be coupled to the electric field of the transmitting electrode TX1, while the other detection electrodes are less affected. When the transmitting electrode TX2 transmits a signal, the detection electrode 3312 can be coupled to the electric field of the transmitting electrode TX2, while the other detection electrodes are less affected. Therefore, the signals from different transmitting electrodes can be distinguished. At the same time, after capacitive coupling through the finger, the receiving electrode at the corresponding position can also detect the change in capacitance, so the receiving electrode can also be distinguished. Therefore, the position of the finger can be normally identified, as well as touch operations such as clicking and sliding. At this time, the touch function of the display screen can be used normally.
[0066] To avoid the detection electrodes affecting the touch detection results, for example, if a user's finger touches the area above the first row of emitting electrodes but is mistakenly detected as touching the area above the second row of emitting electrodes, in this embodiment, the projection of the detection electrode 331 on the display layer 31 overlaps with the projection of the corresponding emitting electrode on the display layer 31, but does not overlap with the projections of other emitting electrodes. That is, the detection electrode 331 will not be located above two emitting electrodes simultaneously. For example, the bioelectrode layer 33 includes detection electrodes 3311, 3312, and 3313. Detection electrode 3311 is positioned above emitting electrode TX1, and its projection overlaps with that of emitting electrode TX1; detection electrode 3312 is positioned above emitting electrode TX2, and its projection overlaps with that of emitting electrode TX2; detection electrode 3313 is positioned above emitting electrode TX3, and its projection overlaps with that of emitting electrode TX3.
[0067] As one possible implementation, the detection electrode is located directly above the emission electrode, and the detection electrode and the emission electrode are the same size and shape. In this case, the projection of the detection electrode 331 on the display layer 31 completely coincides with the projection of the corresponding emission electrode on the display layer 31.
[0068] To prevent these detection electrodes 331 from being connected together to form a shielding layer, the display screen 30 provided in this application embodiment also includes a plurality of switching devices. The detection electrodes are electrically connected to the acquisition circuit through the switching devices. The acquisition circuit is a circuit that receives bioelectric signals and processes the bioelectric signals.
[0069] For example, combining Figure 9The bioelectrode layer includes multiple detection electrodes 331 arranged in 5 rows, denoted as R1 to R5. The first row of detection electrodes R1 is electrically connected to the first terminal of the switching device S1, and the second terminal of the switching device S1 is electrically connected to the acquisition circuit. The second row of detection electrodes R2 is electrically connected to the first terminal of the switching device S2, and the second terminal of the switching device S2 is electrically connected to the acquisition circuit. ... The fifth row of detection electrodes R5 is electrically connected to the first terminal of the switching device S5, and the second terminal of the switching device S5 is electrically connected to the acquisition circuit. When bioelectrical signals are not being acquired, such as when the display screen 30 is working in non-detection mode, these switching devices are disconnected, and the detection electrodes 331 are not connected to each other. Therefore, no shielding layer is formed, and the touch function is not affected. When bioelectric signals need to be collected, such as when the display screen 30 is working in detection mode, these switching devices close and conduct, so that each detection electrode 331 of the bioelectric layer 33 will be electrically connected to the acquisition circuit. All the detection electrodes 331 of the bioelectric layer 33 form a large-area electrode. After the user's finger touches the detection electrode 331, the detection electrode 331 can transmit the detected human bioelectric signals through the acquisition circuit to the subsequent circuit, such as the processor, for signal amplification, acquisition, analysis, etc.
[0070] The preceding example illustrates the arrangement of the detection electrodes in mutual capacitance mode. The display screen can also employ self-capacitive touch detection technology. In this case, the arrangement of the detection electrodes in a self-capacitive mode display screen can differ from that in a mutual capacitance mode display screen. In mutual capacitance mode, the first electrode transmits a signal, and the second electrode receives the signal to detect the mutual capacitance between the first and second electrodes. To avoid affecting touch recognition, the detection electrode needs to be positioned above the first electrode. However, in self-capacitive mode, the capacitance to ground of the first and second electrodes is detected. Therefore, the detection electrode can be positioned above either the first or the second electrode. For example, the method of positioning the electrodes corresponding to the first electrode will be described first, combined with… Figure 10 , Figure 10 The relative positions of the detection electrode with the first and second electrodes are shown here. Figure 10 This is only to illustrate the relative positional relationship between the detection electrode, the first electrode, and the second electrode, and is not intended to limit the arrangement of the detection electrode, the transmitting electrode, and the receiving electrode.
[0071] The detection electrode 331 can be positioned above the first electrode. Here, "above" refers to the side of the first electrode away from the display layer 31. The detection electrode 331 is positioned one-to-one with the first electrode, and its position above the first electrode can be directly above it or offset at a certain angle. For example... Figure 10In the first electrode X1, the detection electrode 3311 is positioned above the first electrode X2, the detection electrode 3312 is positioned above the first electrode X2, and the detection electrode 3313 is positioned above the first electrode X3.
[0072] The projection of the detection electrode 331 onto the display layer overlaps with the projection of the corresponding first electrode onto the display layer, but does not overlap with the projections of other first electrodes. That is, a detection electrode 331 will not be located above two first electrodes simultaneously. The detection electrode 331 may be smaller than the first electrode. In some possible implementations, the detection electrode 331 is located directly above the first electrode, and the detection electrode 331 has the same size and shape as the first electrode.
[0073] Or, such as Figure 11 As shown, the detection electrode 331 can be positioned above the second electrode. Here, "above" refers to the side of the second electrode away from the display layer 31. The detection electrode 331 is positioned one-to-one with the second electrode. It can be located directly above the second electrode or offset at a certain angle. For example, detection electrode 3311 is positioned above the second electrode Y1, detection electrode 3312 is positioned above the second electrode Y2, and detection electrode 3313 is positioned above the second electrode Y3.
[0074] The projection of detection electrode 331 on the display layer overlaps with the projection of the corresponding second electrode on the display layer, but does not overlap with the projections of other second electrodes. That is, a detection electrode will not be located above two second electrodes simultaneously. Taking some of the detection electrodes 331 as an example, the bioelectrode layer 33 includes detection electrodes 3311, 3312, and 3313. Detection electrode 3311 is positioned above second electrode Y1, and its projection overlaps with that of second electrode Y1, but does not overlap with the projections of other second electrodes. Detection electrode 3312 is positioned above second electrode Y2, and its projection overlaps with that of second electrode Y2, but does not overlap with the projections of other second electrodes. Detection electrode 3313 is positioned above second electrode Y3, and its projection overlaps with that of second electrode Y3, but does not overlap with the projections of other second electrodes.
[0075] In this case, it can also be considered that multiple detection electrodes 331 are arranged in a column along the second direction Y, and multiple columns of detection electrodes 331 are arranged at intervals along the first direction X.
[0076] The size of the detection electrode 331 may be smaller than or the same as that of the second electrode. In some possible implementations, the detection electrode is located directly above the second electrode and has the same size and shape as the second electrode.
[0077] The main difference between self-capacitance mode and mutual capacitance mode lies in the scanning or detection method of the display screen to achieve touch function. In some cases, a display screen in self-capacitance mode can also work in mutual capacitance mode. Such a display screen is also called a "self-mutual capacitance screen". That is, the display screen can work in either self-capacitance mode or mutual capacitance mode. The arrangement of the bioelectrode layer provided in the embodiments of this application can be applied to both self-capacitance screens and self-mutual capacitance screens.
[0078] In the self-capacitance mode display, each detection electrode 331 is independently connected to the acquisition circuit via a switching device. That is, the display 30 includes multiple switching devices, and each detection electrode 331 corresponds one-to-one with a different switching device. For example, the detection electrode 331 is electrically connected to the first end of the corresponding switching device, and the second end of the switching device is electrically connected to the acquisition circuit. Figure 12 As shown, Figure 12 A schematic diagram of the circuit structure of the bioelectrode layer is shown. For example, the bioelectrode layer includes detection electrodes 3311 to 3319. Detection electrode 3311 is electrically connected to the acquisition circuit through switching device S1, detection electrode 3312 is electrically connected to the acquisition circuit through switching device S2, and so on. Detection electrode 3319 is electrically connected to the acquisition circuit through switching device S9.
[0079] When the display screen 30 is operating in non-detection mode, all these switching devices are in the off state. Since each detection electrode is above the corresponding first electrode or second electrode, Figure 10 Taking the structure shown as an example, when the capacitance to ground of the first electrode is detected, the electric field is transferred to the detection electrode 331 above it. However, the effect on the detection electrodes 331 at other positions is weak. The electric field is coupled to the user's finger through the detection electrode 331 above, and the capacitance to ground of the first electrode changes significantly. The electric field of the first electrode at the position where the finger is not located will not be coupled to the finger, and the capacitance to ground changes less. Therefore, the position of the finger can be recognized normally, as well as touch operations such as clicking and sliding. At this time, the touch screen can be used normally.
[0080] When it is necessary to collect bioelectric signals, these switching devices close and conduct, so that each detection electrode 331 of the bioelectrode layer 33 will be electrically connected to the acquisition circuit, forming a large-area electrode. When the user places their finger on it, the bioelectric signals of the human body can be transmitted to the subsequent circuit, such as the processor, through the acquisition circuit for signal amplification, acquisition, analysis and other processing.
[0081] As can be seen, the aforementioned switching device can control the working state of the detection electrode 331. When the switching device is on, the detection device 331 can operate; when the switching device is off, the detection device does not operate. The on / off state of the switching device can respond to user operation control. For example, taking a mobile phone as an example, a user interface can be displayed, such as... Figure 13 and Figure 14 Some possible user interfaces are shown, combined with Figure 13 This user interface displays information to the user, such as whether to enable the bioelectrical signal detection function. When the user selects "Yes" to issue a detection command, the processor responds by controlling the switching device to turn on, switching to detection mode and detecting bioelectrical signals. In this case, see [reference needed]. Figure 14 The phone can display another user interface to the user, which can prompt the user to touch the detection area with their finger to complete the detection of bioelectrical signals.
[0082] The switching device can also be disconnected via touch commands issued by the user through the user interface, for example, to continue the connection. Figure 14 During the detection process, the mobile phone can also display another touch button on the user interface. This touch button should be displayed outside the detection area, for example, to prompt the user to stop the bioelectric signal detection function. If the user chooses to stop the detection, the processor can control the above-mentioned switching device to turn off and stop the detection of bioelectric signals.
[0083] Alternatively, when detecting bioelectrical signals, the detection function can be deactivated by detecting whether the user's finger remains on the screen. If the user's finger remains on the screen, detection continues; if the user's finger leaves the screen, the aforementioned switching device is disconnected, and the detection function stops. The aforementioned switching device can be located within the display screen. For example, the display screen includes a substrate, which includes a display area and a non-display area. The aforementioned switching device can be located in the non-display area, and the detection electrode is electrically connected to the switching device via a transparent wire to avoid affecting the display effect.
[0084] In another possible implementation, the aforementioned switching device can also be mounted on the circuit board of the electronic device, with the detection electrode electrically connected to the switching device via a transparent wire.
[0085] Similarly, the aforementioned analog front end can be disposed in the display screen, for example, on the substrate of the display screen, or it can also be disposed on the circuit board of the electronic device. This application embodiment does not limit this.
[0086] This application also provides an electronic device, such as the one described above. Figure 1 and Figure 2The electronic device shown includes a processor, a data acquisition circuit, and a display screen as provided in the foregoing embodiments. The display screen includes a bioelectrode layer, which includes multiple detection electrodes. The detection electrodes are electrically connected to the data acquisition circuit via a switching device. The data acquisition circuit is electrically connected to the processor. The detection electrodes are used to acquire bioelectrical signals. For example, when the switching device is turned on, the detection electrodes can acquire bioelectrical signals and transmit them to the data acquisition circuit. After processing by the data acquisition circuit, the signals are sent to the processor, which can analyze the detected bioelectrical signals.
[0087] In one possible implementation, the aforementioned switching device can be integrated into the display screen, or the switching device and the acquisition circuit can be mounted on the circuit board of the electronic device. To avoid affecting the display effect, the detection electrode is electrically connected to the switching device through a transparent wire.
[0088] When the display screen enters the detection mode in response to a user's command, the switching device is turned on, and the detection electrodes are used to detect bioelectrical signals. The acquisition circuit receives the bioelectrical signals detected by the detection electrodes and sends them to the processor for processing. The aforementioned commands include user touch commands or voice control commands, etc.
[0089] In one possible implementation, the switching device is turned off if the display exits the detection mode. The display may exit the detection mode in response to a user's touch command outside the detection area of the display; or, the display may exit the detection mode when it detects that the user's finger has left the detection area.
[0090] In one possible implementation, the control terminals of the aforementioned multiple switching devices are connected to the processor; the processor can control the multiple switching devices to turn on in response to a user's biometric detection request, and the display screen enters the detection mode; in response to the completion of biometric detection, the processor controls the multiple switching devices to turn off, and the display screen enters the non-detection mode.
[0091] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A display screen, characterized in that, The display screen includes a detection area, which includes a display layer, a touch layer, and a bioelectrode layer stacked sequentially, with the bioelectrode layer disposed on the surface of the touch layer away from the display layer. The touch layer includes a plurality of first electrodes and a plurality of second electrodes. The plurality of first electrodes are arranged in rows along a first direction, and the rows of first electrodes are arranged alternately along a second direction. The plurality of second electrodes are arranged in columns along the second direction, and the columns of second electrodes are arranged alternately along the first direction. The first direction is different from the second direction. The bioelectrode layer includes multiple detection electrodes, which are arranged in rows along the first direction, and the rows of detection electrodes are arranged at intervals along the second direction; the detection electrodes are used to detect bioelectrical signals. The display screen also includes multiple switching devices, and the detection electrode is electrically connected to the acquisition circuit through the switching devices. The acquisition circuit is a circuit that receives bioelectric signals and processes the bioelectric signals. If the display screen enters the detection mode, the plurality of switching devices are turned on; If the display screen enters a non-detection mode, the plurality of switching devices are disconnected.
2. The display screen according to claim 1, characterized in that, Multiple detection electrodes in the same row are electrically connected, each row of detection electrodes is electrically connected to a first terminal of a switching device, and the second terminal of the switching device is electrically connected to the acquisition circuit.
3. The display screen according to claim 1, characterized in that, Each of the detection electrodes is electrically connected to a first terminal of a switching device, and the second terminal of the switching device is electrically connected to the acquisition circuit.
4. The display screen according to any one of claims 1 to 3, characterized in that, The detection electrode corresponds one-to-one with the first electrode; The projections of the detection electrode and the corresponding first electrode on the display layer overlap, but do not overlap with the projections of other first electrodes on the display layer.
5. The display screen according to claim 4, characterized in that, The detection electrode has the same shape and size as the corresponding first electrode; The projection of the detection electrode on the display layer coincides with the projection of the corresponding first electrode on the display layer.
6. The display screen according to any one of claims 1 to 5, characterized in that, The detection electrode corresponds one-to-one with the second electrode; The projections of the detection electrode and the corresponding second electrode on the display layer overlap, but do not overlap with the projections of other second electrodes on the display layer.
7. The display screen according to claim 6, characterized in that, The detection electrode and the corresponding second electrode have the same shape and size; The projection of the detection electrode on the display layer coincides with the projection of the corresponding second electrode on the display layer.
8. The display screen according to any one of claims 1 to 7, characterized in that, The detection electrode is made of a transparent conductive material.
9. The display screen according to any one of claims 1 to 8, characterized in that, The detection electrode is electrically connected to the switching device via a transparent wire.
10. A display screen, characterized in that, The display screen includes a detection area, which includes a display layer, a touch layer, and a bioelectrode layer stacked sequentially, with the bioelectrode layer disposed on the surface of the touch layer away from the display layer. The touch layer includes a plurality of first electrodes and a plurality of second electrodes. The plurality of first electrodes are arranged in rows along a first direction, and the rows of first electrodes are arranged alternately along a second direction. The plurality of second electrodes are arranged in columns along the second direction, and the columns of second electrodes are arranged alternately along the first direction. The first direction is different from the second direction. The bioelectrode layer includes multiple detection electrodes, which are arranged in columns along the second direction, and the columns of detection electrodes are arranged at intervals along the first direction; the detection electrodes are used to detect bioelectrical signals. The display screen also includes multiple switching devices, and the detection electrode is electrically connected to the acquisition circuit through the switching devices. The acquisition circuit is a circuit that receives bioelectric signals and processes the bioelectric signals. If the display screen enters the detection mode, the plurality of switching devices are turned on; If the display screen enters a non-detection mode, the plurality of switching devices are disconnected.
11. An electronic device, characterized in that, The electronic device includes a processor, a data acquisition circuit, and a display screen as described in any one of claims 1 to 10, wherein the data acquisition circuit is electrically connected to the processor; and the control terminals of the plurality of switching devices are connected to the processor. In response to a user's biometric detection request, the processor controls the plurality of switching devices to turn on, and the display screen enters the detection mode; in response to the completion of the biometric detection, the display screen enters the non-detection mode, and the processor controls the plurality of switching devices to turn off.