WO2020056939A1

WO2020056939A1 - Under-screen optical detection system, electronic device and object approach detection method

Info

Publication number: WO2020056939A1
Application number: PCT/CN2018/120605
Authority: WO
Inventors: 张玮; 李顺展; 宋小福
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-09-17
Filing date: 2018-12-12
Publication date: 2020-03-26
Also published as: WO2020056544A1; CN109328358A

Abstract

The present disclosure relates to the technical field of optical detection. Disclosed are an under-screen optical detection system, an electronic device and an object approach detection method. The under-screen optical detection system is arranged under a display screen so as to perform under-screen optical detection, and is characterized by comprising an optical sensor and a light source, wherein the light source is used for emitting excitation light to a target object above the display screen, the excitation light returns from a surface of the target object and then forms returned light, and the returned light penetrates through the display screen and is received by the optical sensor under the display screen so as to perform the under-screen optical detection; and the optical sensor is used for receiving the returned light from the target object above the display screen and performing the under-screen optical detection, and the under-screen optical detection comprises biological characteristic information detection, and object approach detection performed by means of multiplexing the optical sensor.

Description

Under-screen optical detection system, electronic equipment and object proximity detection method

Technical field

The present disclosure relates to the technical field of optical detection, and in particular, to an under-screen optical detection system, an electronic device, and an object proximity detection method.

Background technique

The vast majority of current mobile phones are equipped with proximity sensing. When the mobile phone is close to the head, the distance sensor can detect the distance between the mobile phone and the head. When the distance is less than a certain threshold, the screen background light is turned off, and the distance between the mobile phone and the head is increased, and the background is greater than the above threshold. The light came on again. This function is convenient for users to operate and can save power.

The distance sensor uses infrared LED lights to emit infrared light, and uses an infrared light detector to receive the intensity of infrared light reflected by a close object, and then measures the distance. The effective distance is generally within 10cm. The distance sensor has a transmitting and receiving device at the same time, resulting in a large volume, and most of the distance sensors are located on both sides of the handset or in the groove of the handset. This results in too many holes, black bars or "bangs" in the forehead of the phone, which seriously affects the appearance of the phone. At the same time, current users are pursuing a higher screen ratio. Holes in the front of the screen, black bars or "bangs" will limit the development of full screens.

Summary of the Invention

In view of the problems in the background art, an object of the present disclosure is to provide an under-screen optical detection system; another object of the present disclosure is to provide an electronic device using the under-screen optical detection system; another object of the present disclosure is to An object proximity detection method applied to the under-screen optical detection system is provided.

An embodiment of the present disclosure provides an under-screen optical detection system, which is configured below the display screen to perform under-screen optical detection, including an optical sensor and a light source;

The light source is configured to emit excitation light to a target object above the display screen, the excitation light returns to the target object to form a return light, and the return light passes through the display screen and is displayed by the display. Received by the optical sensor below the screen to perform the optical detection under the screen;

The optical sensor is configured to receive the returned light of a target object above the display screen and perform the under-screen optical detection, where the under-screen optical detection includes biometric information detection and multiplexing the optical sensor. Object proximity detection.

As an optional implementation scheme of the under-screen optical detection system provided by the present disclosure, the object proximity detection includes:

Detecting an environmental brightness value of non-visible light of a specific wavelength in the current environment, wherein the wavelength of the invisible light corresponds to the light-emitting wavelength of the light source of the optical detection system under the screen;

Detecting an actual brightness value of the non-visible light of the specific wavelength when the light source is turned on;

Determining, according to the actual brightness value and the ambient brightness value, the current proximity of the target object to the under-screen optical detection system;

The determination of the proximity of the target object to the under-screen optical detection system is continued until the object proximity detection function is turned off, and the object proximity detection ends.

As an optional implementation solution of the under-screen optical detection system provided by the present disclosure, the environmental brightness value for detecting non-visible light of a specific wavelength in the current environment includes:

Determining whether the light source of the optical detection system under the screen is currently off, and if the light source is currently on, turning off the light source;

When the light source is in an off state, the optical sensor is used to perform brightness detection, and an ambient brightness value of the invisible light with the specific wavelength is obtained.

As an optional implementation solution of the under-screen optical detection system provided by the present disclosure, the actual brightness value of detecting non-visible light of the specific wavelength when the light source is on includes:

After the excitation light emitted by the light source returns from the surface of the target object above the display screen to form return light, the return light passes through the display screen;

The optical sensor receives the return light passing through the display screen, and detects an actual brightness value of the non-visible light of the specific wavelength according to the return light and the non-visible light of the specific wavelength in a current environment.

As an optional implementation scheme of the under-screen optical detection system provided by the present disclosure, the judging condition of the current target object and the under-screen optical detection system is determined based on the actual brightness value and the ambient brightness value. include:

Calculating a difference between the actual brightness value and the ambient brightness value;

Determine whether the difference is greater than a set threshold, if yes, determine that the distance between the target object and the under-screen optical detection system is less than a predetermined value, otherwise determine that the target object and the under-screen optical detection system The distance between them exceeds the predetermined value.

As an optional implementation solution of the under-screen optical detection system provided by the present disclosure, only a part of the optical sensor is selected to detect the ambient brightness value or the actual brightness value.

As an optional implementation scheme of the under-screen optical detection system provided by the present disclosure, the light source is an infrared light source.

As an optional implementation scheme of the under-screen optical detection system provided by the present disclosure, the biometric information detection is under-screen optical fingerprint detection.

Another embodiment of the present disclosure provides an electronic device including the under-screen optical detection system as described above.

As an optional implementation scheme of the electronic device provided by the present disclosure, the electronic device further includes:

A display screen, and the optical sensor is disposed below an optical detection area preset on the display screen.

As an optional implementation solution of the electronic device provided by the present disclosure, the display screen is an OLED screen, and the visible light provided by the OLED screen is used to display a picture and perform the biometric information detection, and the light emitted from the OLED screen Face the target object above the display screen, and the excitation light from the light source is used to perform the object proximity detection.

As an optional implementation solution of the electronic device provided by the present disclosure, the display screen is an LCD screen, the LCD screen includes a liquid crystal module and a backlight module, and the backlight module is disposed below the liquid crystal module, The light emitting surface of the backlight module faces the liquid crystal module and provides visible light to the liquid crystal module so that the liquid crystal module displays a picture. The excitation light emitted by the light source is used to perform the object proximity detection and detection. The biometric information detection is described.

As an optional implementation solution of the electronic device provided by the present disclosure, the electronic device further includes a transparent cover provided above the display screen, and the transparent cover includes a main body portion covering the display screen, and An extension portion extending from an edge of the main body portion, and the light source is disposed below the extension portion.

As an optional implementation solution of the electronic device provided by the present disclosure, the electronic device further includes a coating layer, which is disposed between the transparent cover plate and the light source, and is used to transmit the light emitted by the light source. Excitation light and isolate visible light.

As an optional implementation solution of the electronic device provided by the present disclosure, the light source is disposed below the display screen and is disposed adjacent to the optical sensor.

Another embodiment of the present disclosure provides an object proximity detection method, which is applied to an under-screen optical detection system as described above. The object proximity detection method includes:

As an optional implementation solution of the object proximity detection method provided by the present disclosure, the environmental brightness value of detecting non-visible light of a specific wavelength in the current environment includes:

As an optional implementation solution of the object proximity detection method provided by the present disclosure, the actual brightness value of detecting non-visible light of the specific wavelength when the light source is turned on includes:

As an optional implementation solution of the object proximity detection method provided by the present disclosure, the determining the current proximity of the target object to the under-screen optical detection system based on the actual brightness value and the ambient brightness value includes: :

As an optional implementation solution of the object proximity detection method provided by the present disclosure, only a part of the optical sensor is selected to detect the ambient brightness value or the actual brightness value.

The present disclosure has the following beneficial effects:

The present disclosure provides an under-screen optical detection system, an electronic device, and an object proximity detection method. The under-screen optical detection system includes an optical sensor and a light source. When performing an object proximity detection, there is no need to add an additional distance sensor, and the screen is reused. The optical sensor of the lower optical detection system can realize the function of object proximity detection, which not only reduces the cost, but also improves the integration of electronic equipment, making the electronic equipment more beautiful. Object proximity detection requires lower accuracy than under-screen optical fingerprint detection, so only a part of the optical sensor is selected to detect the ambient brightness value or the actual brightness value. This process can increase the rate of object proximity detection.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments are exemplified by the pictures in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the drawings in the drawings do not constitute a limitation on scale.

FIG. 1 is a schematic diagram of a position of a distance sensor used for object proximity detection in a mobile phone in the prior art; FIG.

2 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

3 is a schematic diagram of object proximity detection performed by the electronic device in the embodiment shown in FIG. 2;

4 is a schematic structural diagram of an electronic device according to another embodiment of the present disclosure;

FIG. 5 is a flowchart of an object proximity detection method according to an embodiment of the present disclosure.

detailed description

To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the embodiments of the present disclosure will be described in detail below with reference to the drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are proposed in order to make the reader better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in the present disclosure can be implemented.

FIG. 1 is a schematic diagram of a position of a distance sensor used for proximity detection of an object in a mobile phone in the prior art. As shown in Figure 1, the distance sensor 100 and the distance sensor 101 are respectively located in the hole of the mobile phone "forehead" and the mobile phone "bangs". It is obvious that this seriously affects the aesthetics of the mobile phone. The additional distance sensor will also increase the cost and reduce integration Degree, while also limiting the development of full screen. In order to overcome the above problems, the present disclosure proposes an under-screen optical detection system. FIG. 2 shows an embodiment in which the under-screen optical detection system is applied to an electronic device.

FIG. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. In the embodiment of the present disclosure, the object proximity detection function can be realized without using an additional distance sensor, and the optical sensor of the optical detection system under the screen can be reused. Therefore, it is not necessary to use the mobile phone “forehead”, “bangs” or other electronic devices. Positioning the distance sensor not only reduces the cost, but also improves the integration of the electronic device, makes the electronic device more beautiful, and further promotes the development of the full screen.

The electronic device 6 includes an LCD screen 1, an under-screen optical detection system 7, and a transparent cover 4. The under-screen optical detection system 7 includes an optical sensor 2 and a light source 3. The LCD screen 1 and the light source 3 are arranged side by side under the transparent cover 4, and are respectively located below a main body portion of the transparent cover 4 and an extension portion extending from an edge of the main body portion. The LCD screen 1 includes a liquid crystal module 11 and a backlight module 12. The backlight module 12 is disposed below the liquid crystal module 11. The optical sensor 2 is disposed below the LCD screen 1, for example, it is specifically disposed below an optical detection area preset on the LCD screen.

In the embodiment of the present disclosure, the transparent cover 4 is made of transparent material and has strong anti-stress capability, and can protect the LCD screen 1. For example, the transparent cover 4 may be a glass cover or a sapphire cover.

The liquid crystal module 11 belongs to a display module, but cannot emit light by itself, and the backlight module 12 is required to provide a light source. The light emitting surface of the backlight module 12 faces the liquid crystal module 11, and the backlight module 12 can emit light. Visible light and provide a uniform visible light surface light source for the liquid crystal module 11 so that the liquid crystal module 11 (or the LCD screen 1) can display a picture; in the embodiment of the present disclosure, the backlight module 12 can pass The optical design enables the liquid crystal module 11 to provide a visible light source while having a high transmittance for non-visible light in a specific wavelength band.

The light source 3 is configured to emit excitation light to a target object above the LCD screen 1, and the excitation light forms return light after returning from the surface of the target object. The return light passes through the LCD screen 1 and is The optical sensor 2 below the LCD screen 1 receives it for optical detection under the screen. The light source 3 may be a light source with a different light emission wavelength from the backlight module 12, specifically, the excitation light emitted by the light source 3 is a non-visible light with a specific wavelength. Alternatively, the light source 3 may be infrared Light source, such as an infrared light emitting diode (LED). In addition, the wavelength of the excitation light is specifically within a working wavelength range of the optical sensor 2.

As an optional embodiment, a coating may be further provided between the transparent cover 4 and the light source 3, and the coating may be applied in advance to the lower surface of the extension of the transparent cover 4 for In the region where the light source 3 is provided, the coating can transmit non-visible light, such as a specific wavelength of non-visible light emitted by the light source 3, and can also isolate visible light, that is, the coating cannot transmit visible light to prevent the user from passing through The transparent cover 4 sees the light source 3 below.

The optical sensor 2 may be, for example, a CMOS image sensor, a CCD image sensor, or another type of optical sensor, which is disposed below the preset optical detection area of the LCD screen 1 for receiving a target above the LCD screen 1 The returned light of the object, and the information of the target object above the LCD screen 1 is detected by the under-screen optical detection. For example, if the target object is a finger or other human body part near or pressing on the LCD screen 1 (or the transparent cover 4 on the surface), the optical sensor 2 may be used to detect fingerprint information of the finger (i.e. Perform optical fingerprint detection under the screen) or other biometric information (such as heart rate, blood oxygen concentration, etc.), or the optical sensor 2 can be used to detect other optical information of the target object (such as the target object and the LCD screen 1) Distance or relative position information, etc.), that is, object proximity detection can be performed. It should be understood here that the distance or relative position information between the target object and the LCD screen 1 also represents the distance or relative distance between the target object and the under-screen optical detection system 7 or the electronic device 6 location information.

Optionally, taking the target object as a finger and the electronic device 6 as a mobile phone as an example, the above-mentioned under-screen optical detection system 7 can be used to detect a preset pressing on the LCD screen 1 (or the transparent cover 4 on its surface) preset The fingerprint information of the finger above the optical detection area of the sensor is to perform optical fingerprint detection under the screen. Specifically, its detection principle is that the light source 3 emits excitation light 31, which is an invisible light with the above-mentioned specific wavelength, and the wavelength of the excitation light 31 is within the working wavelength range of the optical sensor 2. The excitation light 31 passes through the transparent cover 4 and reaches the finger. At this time, part of the excitation light 31 is reflected by the surface of the finger to form the return light 32; the other part enters the inside of the finger and passes through a series of paths to exit the bottom of the finger to form the return light 33. Then, the return light 32 and the return light 33 pass through the transparent cover 4, the liquid crystal module 11 and the backlight module 12 in order to reach the optical sensor 2. After receiving and detecting the return light 32 and the return light 33, the optical sensor 2 sends the return light 32 and the return light 33 to a processor (not shown in FIG. 2) of the electronic device 6 for processing. The signal output by the optical sensor 2 restores the fingerprint image of the finger, and then compares the fingerprint image with the authenticated fingerprint image in the database of the electronic device 6 to perform identity recognition.

It should be noted that the embodiment of the present disclosure does not need to add an additional distance sensor, and the object proximity detection can be completed by multiplexing the optical sensor 2 of the under-screen optical detection system 7. An embodiment of the present disclosure further provides an object proximity detection method, and an embodiment thereof applied to the electronic device 6 is shown in FIG. 3.

FIG. 3 is a schematic diagram of object proximity detection performed by the electronic device in the embodiment shown in FIG. 2. The electronic device 6 may be a mobile phone or a tablet computer.

Optionally, a mobile phone is taken as an example here, and a specific application scenario may be a call state. When the user picks up the electronic device 6 to connect to the phone, the object proximity detection function is turned on, and the light source of the current optical detection system 7 under the screen is determined. 3 is in the off state, if the light source 3 is currently on, the light source 3 is turned off, and when the light source 3 is in the off state, the optical sensor 2 is used to perform brightness detection and obtain a non-specific wavelength The ambient brightness value of visible light, wherein the wavelength of the invisible light corresponds to the light emission wavelength of the light source 3 of the optical detection system under the screen.

In the state where the light source is on, the light source 3 emits excitation light 31 that passes through the transparent cover 4 (all structures of the electronic device 6 in FIG. 2 are not shown in FIG. 3, for specific structures, please (See FIG. 2) Head 34 is reached. At this time, part of the excitation light 31 is reflected by the surface of the head 34 to form the return light 32; the other part enters the inside of the head 34 and passes through the series of paths to exit the head 34 to form the return light 33. . The return light 32 and the return light 33 pass through the transparent cover 4, the liquid crystal module 11 and the backlight module 12 in order to reach the optical sensor 2. The optical sensor 2 receives the return light 32 and the return light 33, and detects that the return light 32, the return light 33, and the invisible light of the specific wavelength in the current environment are turned on in the light source 3. The actual brightness value of the invisible light at the specific wavelength in the state.

Wherein, the closer the head 34 is to the electronic device 6, the stronger the light intensity of the return light 32 and the return light 33, the actual the invisible light of the above specific wavelength detected by the optical sensor 2 is. The greater the brightness value. When the head 34 gradually approaches the electronic device 6, the above-mentioned actual brightness value gradually increases. When the distance between the head 34 and the electronic device 6 reaches a certain distance, the actual brightness value is greater than the The ambient brightness value; and the closer the head 34 is to the electronic device 6, the larger the actual brightness value is than the ambient brightness value. Therefore, the current proximity of the head 34 to the electronic device 6 can be determined according to the actual brightness value and the ambient brightness value.

Optionally, a threshold value may be set, and when the difference between the actual brightness value and the ambient brightness value is greater than the threshold value, it may be determined that the distance between the head 34 and the electronic device 6 is less than a predetermined value At this time, the electronic device 6 is triggered to stop the screen to achieve the purpose of power saving. When the difference between the actual brightness value and the ambient brightness value is less than or equal to the threshold value, it can be determined that the distance between the head 34 and the electronic device 6 exceeds the predetermined value, and the electronic device can be controlled at this time. The device 6 maintains a bright screen state.

As an optional embodiment, the application scenario provided in this embodiment is a call state. Since the call state may be a long period of time, it is necessary to continuously determine the proximity of the head 34 to the electronic device 6 Situation, until the call state ends, the object proximity detection function is turned off, and the object proximity detection ends. In other possible embodiments, it is also necessary to continuously determine the proximity between the target object and the electronic device 6 (or the under-screen optical detection system 7, the LCD screen 1) according to the actual situation, until the The object proximity detection function is turned off, and the object proximity detection ends, which is not described in detail in this embodiment.

It should be noted that, unlike the optical fingerprint detection under the screen, the object proximity detection does not require high accuracy, and only a part of the optical sensor 2 may be selected to detect the ambient brightness value or the actual brightness. Value, that is, only a partial area of the optical sensor 2 is selected to perform the object proximity detection, so as to increase the rate of the object proximity detection. Optionally, only an area with a small center of the optical sensor 2 is selected for the object proximity detection.

FIG. 4 is a schematic structural diagram of an electronic device according to another embodiment of the present disclosure. The difference between the electronic device in this embodiment and the electronic device shown in FIG. 2 is that the display screen of the electronic device 6 in the embodiment of the present disclosure uses an OLED screen 5, and the display screen of the electronic device 6 shown in FIG. 2 The LCD screen 1 is used.

In addition, the light source 3 of the under-screen optical detection system 7 in FIG. 2 provides the excitation light 31 for performing the under-screen optical detection, and in addition to the light source 3 in FIG. 4, the OLED screen 5 may also provide an under-screen. The optical detection of the excitation light 51.

The under-screen optical detection may be detecting biometric information of a target object above the OLED screen 5 (for example, when the target object is a human body, a person's fingerprint, heart rate, and blood oxygen concentration, etc.). Other optical information of the target object (such as the distance between the target object and the OLED screen 5 or relative position information, etc.) can also be detected, that is, object proximity detection can be performed.

Optionally, in the embodiment of the present disclosure, the excitation light 31 provided by the light source 3 is used to perform the object proximity detection. For a specific detection method, refer to the embodiment in FIG. 3.

The excitation light 51 emitted from the OLED screen 5 can be used to perform the optical fingerprint detection under the screen. For details, refer to the embodiment for detecting fingerprint information in FIG. 2. In the embodiment of the present disclosure, the target object is also a finger, and the electronic device 6 is a mobile phone as an example. The under-screen optical detection system 7 can be used to detect the transparent cover pressed on the OLED screen 5 (or above it). 4) Fingerprint information of the finger above the preset optical detection area. The detection principle is specifically that the excitation light for detecting the optical fingerprint under the screen is provided by the OLED screen 5, the excitation light 51 emitted by the OLED screen 5 is visible light, and the wavelength of the excitation light 51 is located at The optical sensor 2 is within the operating wavelength range.

The excitation light 51 passes through the transparent cover 4 and reaches the finger. At this time, a part of the excitation light 51 is reflected by the surface of the finger to form the return light 52; the other part enters the inside of the finger and passes through a series of paths to exit the bottom of the finger to form the return light 53. Then, the return light 52 and the return light 53 pass through the transparent cover 4 and the OLED screen 5 in sequence and reach the optical sensor 2. After receiving and detecting the return light 52 and the return light 53, the optical sensor 2 sends the return light 52 and the return light 53 to a processor (not shown in FIG. 4) of the electronic device 6 for processing. The signal output by the optical sensor 2 restores the fingerprint image of the finger, and then compares the fingerprint image with the authenticated fingerprint image in the database of the electronic device 6 to perform identity recognition.

FIG. 5 is a flowchart of an object proximity detection method according to an embodiment of the present disclosure. As shown in Figure 5, the method includes:

In step S101, an ambient brightness value L1 of a non-visible light with a specific wavelength in the current environment is detected, wherein the wavelength of the invisible light corresponds to a light emission wavelength of a light source of the optical detection system under the screen.

In a specific embodiment, the wavelength of the invisible light with the specific wavelength may be located in a working wavelength range of an optical sensor of the optical detection system under the screen, such as infrared light.

In step S101, before detecting the above-mentioned ambient brightness value L1, it is necessary to determine whether the light source of the current under-screen optical detection system is turned off. If the light source is currently turned on, then the light source is turned off. Prepare the ambient brightness value L1. When the light source is in an off state, the optical sensor is used to perform brightness detection, and an ambient brightness value L1 of the invisible light with the specific wavelength is obtained.

Step S102, detecting the actual brightness value L2 of the invisible light of the specific wavelength in the state where the light source is turned on;

When the light source is on, non-visible light of the above specific wavelength is emitted as excitation light. When a target object approaches the under-screen optical detection system, the invisible light emitted by the light source returns from the surface of the target object above the display screen Then, return light is formed. The return light passes through the display screen and enters the optical sensor. The optical sensor receives the return light passing through the display screen, and according to the return light and the current environment. The non-visible light of the specific wavelength detects an actual brightness value L2 of the non-visible light of the specific wavelength.

Wherein, the closer the target object is to the under-screen optical detection system, the stronger the intensity of the returned light, and the larger the actual brightness value L2 of the invisible light of the specific wavelength detected by the optical sensor. . When the target object approaches the optical detection system under the screen, the actual brightness value L2 gradually increases. When the distance between the target object and the optical detection system under the screen reaches a certain distance, the actual brightness The value L2 is greater than the ambient brightness value L1; and the closer the target object is to the under-screen optical detection system, the greater the actual brightness value L2 is than the ambient brightness value L1. Therefore, according to the actual brightness value L2 and the ambient brightness value L1, the current proximity of the target object to the under-screen optical detection system can be determined.

It should be noted that, unlike the optical fingerprint detection under the screen, the object proximity detection does not require high accuracy. When performing step 101 or step 102, only a part of the optical sensor may be selected to detect the ambient brightness. The value L1 or the actual brightness value L2 is used to increase the rate of the object proximity detection. Optionally, only the area with a smaller center of the optical sensor 2 is selected to detect the ambient brightness value L1 or the actual brightness value L2.

In step S103, according to the actual brightness value L1 and the ambient brightness value L2, determine the current proximity of the target object to the optical detection system under the screen.

In step S103, according to the actual brightness value L1 and the ambient brightness value L2, to determine the current proximity of the target object to the under-screen optical detection system, the actual brightness value L2 and the environment may be used The difference (L2-L1) of the brightness value L1 is used for judgment. Specifically, determine whether the difference (L2-L1) is greater than a set threshold; if yes, determine that the distance between the target object and the under-screen optical detection system is less than a predetermined value, otherwise determine the target object The distance from the under-screen optical detection system exceeds the predetermined value. The threshold value can be determined by the actual debugging distance. It should be noted that, according to the actual brightness value L2 and the ambient brightness value L1, to determine the current proximity of the target object to the under-screen optical detection system, the actual brightness value L2 and the Judgment is made based on the results of other mathematical operation relationships between the ambient brightness values L1, and can be determined according to actual conditions, which is not limited in this embodiment.

In step S104, the proximity of the target object to the under-screen optical detection system is continuously determined until the object proximity detection function is turned off, and the object proximity detection ends.

In an optional embodiment, the under-screen optical detection system can be applied to electronic devices such as mobile phones. When the application scenario is a call state, the call state may be a long period of time, so it needs to be continued. Determining the proximity of the target object to the under-screen optical detection system (or the electronic device) until the call state ends, the object proximity detection function is turned off, and the object proximity detection ends.

Although this disclosure contains many details, these should not be construed as limitations on the scope of any invention or claimed, but rather as descriptions of features that may be unique to particular embodiments of a particular invention. Certain features described in this patent document may also be implemented in combination in a single embodiment in the context of separate embodiments. Conversely, various features that are described in the context of a single embodiment can also be implemented individually in multiple embodiments or in any suitable sub-combination. Moreover, although a feature may be described above as functioning in certain combinations, and even originally so claimed, one or more features from the claimed combination may in some cases be removed from the combination, and the claimed A combination may involve a sub-combination or a modification of a sub-combination.

Similarly, although the operations are described in a particular order in the drawings, this should not be construed as requiring that the operations be performed in the specific order shown or in order, or that all operations shown be performed to achieve the desired result . Moreover, the various individual system components in the embodiments described in this patent document should not be construed as requiring such separation in all embodiments.

A person of ordinary skill in the art can understand that the foregoing embodiments are specific embodiments for implementing the present application, and in practical applications, various changes can be made in form and details without departing from the scope of the present application.

Claims

An under-screen optical detection system, which is arranged below the display screen for under-screen optical detection, and is characterized by including an optical sensor and a light source;

The light source is configured to emit excitation light to a target object above the display screen, the excitation light returns to the target object to form a return light, and the return light passes through the display screen and is displayed by the display. Received by the optical sensor below the screen to perform the optical detection under the screen;

The optical sensor is configured to receive the returned light of a target object above the display screen and perform the under-screen optical detection, where the under-screen optical detection includes biometric information detection and multiplexing the optical sensor. Object proximity detection.
The under-screen optical detection system according to claim 1, wherein the object proximity detection comprises:

Detecting an environmental brightness value of non-visible light of a specific wavelength in the current environment, wherein the wavelength of the invisible light corresponds to the light-emitting wavelength of the light source of the optical detection system under the screen;

Detecting an actual brightness value of the non-visible light of the specific wavelength when the light source is turned on;

Determining, according to the actual brightness value and the ambient brightness value, the current proximity of the target object to the under-screen optical detection system;

The determination of the proximity of the target object to the under-screen optical detection system is continued until the object proximity detection function is turned off, and the object proximity detection ends.
The under-screen optical detection system according to claim 2, wherein the environmental brightness value for detecting non-visible light of a specific wavelength in the current environment comprises:

Determining whether the light source of the optical detection system under the screen is currently off, and if the light source is currently on, turning off the light source;

When the light source is in an off state, the optical sensor is used to perform brightness detection, and an ambient brightness value of the invisible light with the specific wavelength is obtained.
The under-screen optical detection system according to claim 2, wherein the actual brightness value of detecting the invisible light of the specific wavelength in the state where the light source is on comprises:

After the excitation light emitted by the light source returns from the surface of the target object above the display screen to form return light, the return light passes through the display screen;

The optical sensor receives the return light passing through the display screen, and detects an actual brightness value of the non-visible light of the specific wavelength according to the return light and the non-visible light of the specific wavelength in a current environment.
The under-screen optical detection system according to claim 2, wherein the determining the current proximity of the target object to the under-screen optical detection system based on the actual brightness value and the ambient brightness value comprises :

Calculating a difference between the actual brightness value and the ambient brightness value;

Determine whether the difference is greater than a set threshold, if yes, determine that the distance between the target object and the under-screen optical detection system is less than a predetermined value, otherwise determine that the target object and the under-screen optical detection system The distance between them exceeds the predetermined value.
The under-screen optical detection system according to claim 2, wherein only a part of the optical sensor is selected to detect the ambient brightness value or the actual brightness value.
The under-screen optical detection system according to claim 2, wherein the light source is an infrared light source.
The under-screen optical detection system according to claim 1, wherein the biometric information detection is under-screen optical fingerprint detection.
An electronic device, comprising the under-screen optical detection system according to any one of claims 1-8.
The electronic device according to claim 9, further comprising:

A display screen, and the optical sensor is disposed below an optical detection area preset on the display screen.
The electronic device according to claim 10, wherein the display screen is an OLED screen, and the visible light provided by the OLED screen is used for displaying a picture and detecting the biometric information, and a light emitting surface of the OLED screen Toward the target object above the display screen, and the excitation light emitted by the light source is used to perform the object proximity detection.
The electronic device according to claim 10, wherein the display screen is an LCD screen, and the LCD screen includes a liquid crystal module and a backlight module, and the backlight module is disposed below the liquid crystal module. The light emitting surface of the backlight module faces the liquid crystal module and provides visible light to the liquid crystal module so that the liquid crystal module displays a picture. The excitation light emitted by the light source is used for the object proximity detection and the Detection of biometric information.
The electronic device according to claim 10, further comprising a transparent cover provided above the display screen, the transparent cover including a main body portion covering the display screen and The extension portion extends from an edge of the main body portion, and the light source is disposed below the extension portion.
The electronic device according to claim 13, further comprising a coating layer, the coating layer being disposed between the transparent cover plate and the light source for transmitting an excitation emitted by the light source Light and isolate visible light.
The electronic device according to claim 10, wherein the light source is disposed below the display screen and is disposed adjacent to the optical sensor.
An object proximity detection method applied to the under-screen optical detection system according to any one of claims 1 to 8, wherein the object proximity detection method includes:

Detecting an environmental brightness value of non-visible light of a specific wavelength in the current environment, wherein the wavelength of the invisible light corresponds to the light-emitting wavelength of the light source of the optical detection system under the screen;

Detecting an actual brightness value of the non-visible light of the specific wavelength when the light source is turned on;

Determining, according to the actual brightness value and the ambient brightness value, the current proximity of the target object to the under-screen optical detection system;

The determination of the proximity of the target object to the under-screen optical detection system is continued until the object proximity detection function is turned off, and the object proximity detection ends.
The method for detecting the proximity of an object according to claim 16, wherein the environmental brightness value of detecting non-visible light of a specific wavelength in the current environment comprises:

Determining whether the light source of the optical detection system under the screen is currently off, and if the light source is currently on, turning off the light source;

When the light source is in an off state, the optical sensor is used to perform brightness detection, and an ambient brightness value of the invisible light with the specific wavelength is obtained.
The method for detecting the proximity of an object according to claim 16, wherein the actual brightness value of the non-visible light of the specific wavelength when the light source is turned on comprises:

After the excitation light emitted by the light source returns from the surface of the target object above the display screen to form return light, the return light passes through the display screen;

The optical sensor receives the return light passing through the display screen, and detects an actual brightness value of the non-visible light of the specific wavelength according to the return light and the non-visible light of the specific wavelength in a current environment.
The method for detecting the proximity of an object according to claim 16, wherein determining the current proximity of the target object to the under-screen optical detection system based on the actual brightness value and the ambient brightness value comprises:

Calculating a difference between the actual brightness value and the ambient brightness value;

Determine whether the difference is greater than a set threshold, if yes, determine that the distance between the target object and the under-screen optical detection system is less than a predetermined value, otherwise determine that the target object and the under-screen optical detection system The distance between them exceeds the predetermined value.
The method for detecting the proximity of an object according to claim 16, wherein only a part of the optical sensor is selected to detect the ambient brightness value or the actual brightness value.