Under-screen structure and scene recognition method of mobile phone based on the under-screen structure

Abstract

The present invention provides an under-screen structure and a mobile phone scene recognition method based on the under-screen structure. An under-screen structure, characterized in that it includes a flexible circuit board, a PCB board, a suspended copper sheet, a SAR sensor and a middle frame, wherein the flexible circuit board, the SAR sensor, the PCB board and the suspended copper sheet are arranged on the middle frame; one end of the flexible circuit board is connected to the PCB board, and the other end of the flexible circuit board is connected to the suspended copper sheet, and the suspended copper sheet is respectively connected to the middle frame and the SAR sensor. The present invention makes full use of the under-screen SAR sensor and the special structural processing of the mobile phone, and uses the copper sheet part on the screen to solve the problem and realize the recognition of multiple scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone scene recognition, and in particular to an under-screen structure and a scene recognition method for a mobile phone based on the under-screen structure. Background Art

[0002] At present, with the increase in mobile phone communication needs and functions, the widespread application of 2G, 3G, 4G and 5G communication bands on mobile phones and the use of black technologies such as curved screens and surround screens. The solution of using the side frame of the mobile phone as an antenna has become generally practical. However, if you want to detect the approach of objects near the side antenna and how to reduce the side SAR value, there is currently no other way to detect the side unless the ID and structure agree to use the floating frame branch as a detection branch. The same is true for the SAR reduction solution for the side, so the current SAR reduction solution is mainly to directly reduce the conducted POWER, and there is no other effective method. Summary of the invention

[0003] The present invention provides an under-screen structure and a scene recognition method for a mobile phone based on the under-screen structure, so as to solve the above-mentioned problem.

[0004] A structure under the screen, characterized in that it includes a flexible circuit board, a PCB board, a suspended copper sheet, a SAR sensor and a middle frame, wherein:

[0005] The flexible circuit board, SAR sensor, PCB board and suspended copper sheet are arranged on the middle frame;

[0006] One end of the flexible circuit board is connected to the PCB board, and the other end thereof is connected to the suspended copper sheet, and the suspended copper sheet is respectively connected to the middle frame and the SAR sensor.

[0007] As an embodiment of the present invention: the suspended copper sheet includes a screen suspended copper sheet and a screen side suspended copper sheet; wherein,

[0008] The screen suspended copper sheet and the screen side suspended copper sheet are respectively connected to the SAR sensor;

[0009] The suspended copper skin is formed by cutting the inner metal copper skin of the screen, and the screen includes a straight screen or a curved screen.

[0010] As an embodiment of the present invention: the suspended copper sheet further includes a first suspended copper sheet, a second suspended copper sheet and a third suspended copper sheet; wherein,

[0011] The first suspended copper sheet, the second suspended copper sheet and the third suspended copper sheet are connected to the same SAR sensor;

[0012] The first suspended copper skin, the second suspended copper skin and the third suspended copper skin are respectively connected to different flexible circuit boards.

[0013] As an embodiment of the present invention: the flexible circuit board includes a first flexible circuit board, a second flexible circuit board, a third flexible circuit board and a fourth flexible circuit board;

[0014] One end of the first flexible circuit board is connected to the first suspended copper sheet via a first connector, and the other end thereof is connected to the PCB board;

[0015] The second flexible circuit board is connected to the second suspended copper sheet via a second connector, and the other end of the second flexible circuit board is connected to the PCB board;

[0016] The third flexible circuit board is connected to the third suspended copper sheet via a third connector, and the other end of the third flexible circuit board is connected to the PCB board;

[0017] One end of the fourth flexible circuit board is connected to the screen suspension copper sheet, and the other end thereof is connected to the middle frame.

[0018] As an embodiment of the present invention: the area of ​​the suspended copper sheet is not less than 50 square millimeters.

[0019] A mobile phone multi-scene recognition method based on an under-screen structure, comprising:

[0020] When an external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet;

[0021] Determine the target distance between the external object and the suspended copper sheet according to the capacitance change information;

[0022] Scene recognition is performed according to the target distance and a preset scene distance model.

[0023] As an embodiment of the present invention: when the external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet, including:

[0024] When an external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet according to the change of the electromagnetic field; wherein,

[0025] The charge change information includes:

[0026] Information about the screen charge changes of the screen's suspended copper foil;

[0027] First charge change information of the first suspended copper sheet;

[0028] Second charge change information of the second suspended copper skin;

[0029] The third charge change information of the third suspended copper skin.

[0030] As an embodiment of the present invention: when the external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet, including:

[0031] The SAR sensor acquires the first charge change information, the second charge change information, and the third charge change information, and determines a first change value of the first suspended copper sheet, a second change value of the second suspended copper sheet, and a third change value of the third suspended copper sheet;

[0032] Sorting the first change value, the second change value, and the third change value to determine a sorting order;

[0033] A first distance sequence between the external object and the first suspended copper skin, the second suspended copper skin and the third suspended copper skin is determined according to the sorting sequence.

[0034] As an embodiment of the present invention: determining the target distance between the external object and the suspended copper sheet according to the charge change information includes:

[0035] Determine the direction of the approaching external object according to the screen charge change information of the screen suspended copper sheet 6;

[0036] After the direction of the approaching external object is determined:

[0037] Calculating a first capacitance increase / decrease value of the first suspended copper sheet according to the first charge change information of the first suspended copper sheet, and determining a first distance value between the first suspended copper sheet and the external object through a preset algorithm according to the first capacitance increase / decrease value;

[0038] Calculating a second capacitance increase / decrease value of the second suspended copper sheet according to the second charge change information of the second suspended copper sheet, and determining a second distance value between the second suspended copper sheet and the external object by a preset algorithm according to the second capacitance increase / decrease value;

[0039] Calculating a third capacitance increase / decrease value of the third suspended copper sheet according to the third charge change information of the third suspended copper sheet, and determining a third distance value between the third suspended copper sheet and the external object by a preset algorithm according to the third capacitance increase / decrease value;

[0040] Sorting the first distance value, the second distance value and the third distance value to determine a second distance order;

[0041] comparing the first distance sequence and the second distance sequence;

[0042] When the first distance sequence is the same as the second distance sequence, it indicates that the distance collection is correct, the smallest distance value among the first distance value, the second distance value and the third distance value is selected as the scene recognition distance value, and the suspended copper sheet corresponding to the smallest distance value is obtained;

[0043] When the first distance sequence is different from the second distance sequence, the charge change information of the suspended copper skin is collected again for identification.

[0044] As an embodiment of the present invention: the method of determining the target distance between the external object and the suspended copper sheet according to the charge change information comprises the following steps:

[0045] Step 1: Obtain the initial charge q of the first suspended copper foil 10 And real-time detection of charge q 1s , the initial charge of the second suspended copper sheet q 20 And real-time detection of charge q 2s ; The initial charge of the third suspended copper sheet q 30 And real-time detection of charge q 3s ;

[0046] Determine the charge change Δq of the first suspended copper sheet 1 =q 1s -q 10 ;

[0047] Determine the charge change Δq of the second suspended copper sheet 2 =q 2s -q 20 ;

[0048] Determine the charge change Δq of the third suspended copper sheet 3 =q 3s -q 30 ;

[0049] Wherein, I represents the current value of the first suspended copper sheet (62), the second suspended copper sheet (63) and the third suspended copper sheet (64);

[0050] Step 2: Obtain the current values ​​of the first suspended copper sheet, the second suspended copper sheet, and the third suspended copper sheet; obtain the resistance value R of the first suspended copper sheet 1 The resistance value of the second suspended copper sheet R 2 The resistance value R of the third suspended copper sheet 3 ;

[0051] According to the charge change Δq of the first suspended copper sheet 1 ; The charge change of the second suspended copper sheet Δq 2 ; The charge change of the third suspended copper sheet Δq 3 ;

[0052] Determine the capacitance change value of the first suspended copper skin respectively

[0053] The capacitance change value of the second suspended copper sheet

[0054] The capacitance change value of the third suspended copper sheet

[0055] Step 3: According to the capacitance change value C of the first suspended copper skin 1 , the capacitance change value C of the second suspended copper skin 2 And the capacitance change value C of the third suspended copper skin 3 ;

[0056] Determine the distance between the external object and the first suspended copper sheet respectively

[0057] The distance between the external object and the second suspended copper sheet

[0058] The distance between the external object and the third suspended copper sheet

[0059] Among them, the is the dielectric constant; the S 1 is the area of ​​the first suspended copper sheet 62; 2 is the area of ​​the second suspended copper sheet 63; 3 is the area of ​​the third suspended copper sheet 64; the log e S 1 represents S with base e 1 The exponential of the log e S 2 represents S with base e 2 The exponential of the log e S 3 represents S with base e 3 The exponent of f is the edge effect factor, and h is the adjacent constant between adjacent suspended copper skins.

[0060] The beneficial effect of the present invention is that the present invention makes full use of the SAR sensor under the screen and the special structural processing of the mobile phone, and uses the copper sheet on the screen (straight screen and curved screen) to solve the problem. The copper sheet is divided into special sizes and shapes (depending on the design of the mobile phone), and the suspended copper sheet is used as the suspended sheet of the SAR sensor. When an external object approaches the mobile phone, the change in the charge on the copper sheet is calculated to calculate the change in capacitance, thereby obtaining the distance of the external object close to the mobile phone, and realizing the recognition of multiple scenes.

[0061] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0062] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0064] Figure 1 A diagram showing the composition of a sub-screen structure in an embodiment of the present invention;

[0065] Figure 2 This is a schematic diagram of the connection between a suspended copper sheet and a PCB in an under-screen structure according to an embodiment of the present invention;

[0066] Figure 3 This is a scene diagram of a mobile phone being held by the left hand in an embodiment of the present invention;

[0067] Figure 4 This is a scene diagram illustrating a mobile phone being held by the right hand in an embodiment of the present invention;

[0068] Figure 5 FIG. 4 is a schematic diagram of a SAR sensor in an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0070] Embodiment 1:

[0071] As attached Figure 1 The structure of a screen under the display is shown in the figure, and the screen under the display structure includes a flexible circuit board, a PCB board 1, a suspended copper sheet, a SAR sensor and a middle frame 2, wherein:

[0072] The flexible circuit board, SAR sensor, PCB board and suspended copper sheet are arranged on the middle frame 2;

[0073] One end of the flexible circuit board is connected to the PCB board 1, and the other end of the flexible circuit board is connected to the suspended copper sheet, and the suspended copper sheet is respectively connected to the middle frame 2 and the SAR sensor.

[0074] The principle of the present invention is that the present invention realizes multi-scene recognition by processing the under-screen SAR sensor and the special structure of the mobile phone. The structure of the SAR sensor is as follows: Figure 5 As shown, by processing the SAR sensor of the mobile phone and the copper parts on the screen, the suspended copper can change its capacitance when an external object approaches. There are up to five input ports, which are respectively connected to the suspended copper in the present invention. The suspended copper, the flexible circuit board and the SAR sensor are connected by setting a through hole 5 on the middle frame 2 so that the SAR sensor senses the change in capacitance. The SAR sensor converts the change in induced capacitance generated by the approach or distance of the external object to the sensor sheet of the SAR sensor into the approach distance of the external object.

[0075] The change in the distance between the external object and the sensor produces a change in the electromagnetic field, which leads to a change in the charge on the sensor. The change in charge causes the capacitance load value of the SAR sensor itself to change. From the change in capacitance, we can calculate the distance between the external object and the sensor, thereby achieving multi-scene recognition.

[0076] The beneficial effect of the present invention is that the present invention makes full use of the SAR sensor under the screen and the special structural processing of the mobile phone, and uses the copper sheet on the screen (straight screen and curved screen) to solve the problem. The copper sheet is divided into special sizes and shapes (depending on the design of the mobile phone), and the suspended copper sheet is used as the suspended sheet of the SAR sensor. When an external object approaches the mobile phone, the change in the charge on the copper sheet is calculated to calculate the change in capacitance, thereby obtaining the distance of the external object close to the mobile phone, and realizing the recognition of multiple scenes.

[0077] Embodiment 2:

[0078] As an embodiment of the present invention: Figure 2 As shown, the suspended copper sheet includes a screen suspended copper sheet 6 and a screen side suspended copper sheet 61; wherein,

[0079] The screen suspended copper sheet 6 and the screen side suspended copper sheet 61 are respectively connected to the SAR sensor;

[0080] The suspended copper skin is formed by cutting the inner metal copper skin 4 of the screen, and the screen includes a straight screen or a curved screen.

[0081] The principle of the present invention is that the screen suspended copper skin 6 is used to sense the capacitance change of the screen; the screen side suspended copper skin 61 is used to sense the capacitance change of the screen side. The screen suspended copper skin 6 and the screen side suspended copper skin 61 are the first suspended skins to judge the approach of external objects, but because the screen suspended copper skin 6 is at the center of the mobile phone and the screen side suspended copper skin 61 is at the side of the mobile phone, if there is only one, the distance measurement result is relatively not particularly accurate. The screen side suspended copper skin 61 determines one point for multiple distances, and the measurement result is accurate.

[0082] The beneficial effect of the present invention is that the present invention can determine the first distance result by the change state of the charge when the external object contacts it. The inner copper layer 4 of the side of the screen is directly processed only from the inside of the original mobile phone, which saves costs and expands the function of the original structure.

[0083] Embodiment 3:

[0084] As an embodiment of the present invention: the screen-side suspended copper sheet 61 further includes a first suspended copper sheet 62, a second suspended copper sheet 63 and a third suspended copper sheet 64; wherein,

[0085] The first suspended copper sheet 62, the second suspended copper sheet 63 and the third suspended copper sheet 64 are connected to the same SAR sensor;

[0086] The first suspended copper sheet 62, the second suspended copper sheet 63 and the third suspended copper sheet (64) are respectively connected to different flexible circuit boards.

[0087] The principle and beneficial effect of the present invention are as follows: by setting the first suspended copper skin 62, the second suspended copper skin 63 and the third suspended copper skin 64 on the side of the screen, it is possible to determine that when an external object contacts, the charge changes in the first suspended copper skin 62, the second suspended copper skin 63 and the third suspended copper skin 64 are sensed, and then the second distance result of the external object approaching the suspended copper skin of the present invention can be determined. Because the second distance result is judged by the common distance result of the three suspensions throughout, the determined distance result is more accurate.

[0088] Embodiment 4:

[0089] As an embodiment of the present invention, the flexible circuit board includes a first flexible circuit board 31, a second flexible circuit board 32, a third flexible circuit board 33, and a fourth flexible circuit board 34.

[0090] One end of the first flexible circuit board 31 is connected to the first suspended copper sheet 62 via a first connector, and the other end thereof is connected to the PCB board 1 ; and is used to transmit the capacitance change of the first suspended copper sheet 62 to the SAR sensor.

[0091] The second flexible circuit board 32 is connected to the second suspended copper sheet 63 via a second connector, and the other end of the second flexible circuit board 32 is also connected to the PCB board 1 ; it is used to transmit the capacitance change of the second suspended copper sheet 63 to the SAR sensor.

[0092] The third flexible circuit board 33 is connected to the third suspended copper sheet 64 via a third connector, and the other end of the third flexible circuit board 33 is connected to the PCB board 1 ; it is used to transmit the capacitance change of the third suspended copper sheet 64 to the SAR sensor.

[0093] One end of the fourth flexible circuit board 34 is connected to the screen suspension copper sheet 6 , and the other end thereof is connected to the middle frame 2 ; it is used to transmit the capacitance change of the screen suspension copper sheet 6 to the SAR sensor.

[0094] Based on the processing of the PCB board 1 , data on the capacitance changes of the first suspended copper skin 62 , the second suspended copper skin 63 and the third suspended copper skin 64 are obtained.

[0095] The beneficial effect is that data transmission is directly transmitted through the flexible circuit board, which speeds up the response speed.

[0096] Embodiment 5:

[0097] As an embodiment of the present invention, the area of ​​the suspended copper sheet is not less than 50 square millimeters. If the area is larger than 50 square millimeters, the amount of charge is larger, and when the charge changes, the change is more significant, and it is not easy to make a misjudgment.

[0098] Embodiment 6:

[0099] A mobile phone multi-scene recognition method based on an under-screen structure, comprising:

[0100] When an external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet;

[0101] Determine the target distance between the external object and the suspended copper sheet according to the charge change information;

[0102] Scene recognition is performed according to the target distance and a preset scene distance model.

[0103] The principle of the present invention is that the SAR sensor converts the approach distance of the external object into the change of the induction capacitance generated by the approach or distance of the external object to the induction sheet of the SAR sensor, that is, the suspended copper sheet.

[0104] The sensing piece of the SAR sensor is a suspended large-area metal piece with an area of ​​at least about 50 square millimeters.

[0105] When the distance between an external object and the sensing plate of the SAR sensor changes, the electromagnetic field changes, which causes a change in the charge on the sensing plate. The change in charge causes a change in the capacitance load value of the SAR sensor itself. From the change in capacitance value, we can calculate the distance between the external object and the sensing plate of the SAR sensor, thereby achieving multi-scene recognition.

[0106] The beneficial effect of the present invention is that the present invention makes full use of the SAR sensor under the screen and the special structural processing of the mobile phone, and uses the copper sheet on the screen (straight screen and curved screen) to solve the problem. The copper sheet is divided into special sizes and shapes (depending on the design of the mobile phone), and the suspended copper sheet is used as the suspended sheet of the SAR sensor; that is, the sensing sheet. When an external object approaches the mobile phone, the change in capacitance is calculated by calculating the change in the charge on the copper sheet, thereby obtaining the distance of the external object close to the mobile phone. The recognition of multiple scenes is realized.

[0107] Embodiment 7:

[0108] As an embodiment of the present invention: when the external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet, including:

[0109] When an external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet according to the change of the electromagnetic field; wherein,

[0110] The charge change information includes:

[0111] Information about the screen charge change of the screen suspension copper sheet 6;

[0112] First charge change information of the first suspended copper sheet 62;

[0113] Second charge change information of the second suspended copper sheet 63;

[0114] The third charge change information of the third suspended copper skin 64 .

[0115] The beneficial effect of the present invention is that the direction of the approaching external object can be determined by the screen charge change information and the screen side charge change information. The capacitance change values ​​of the first suspended copper skin 62, the second suspended copper skin 63 and the third suspended copper skin 64 can be obtained by the first charge change information, the second charge change information and the third charge change information. The suspended copper skin is more sensitive to the change of charge due to the effect of the electromagnetic field.

[0116] Embodiment 8:

[0117] As an embodiment of the present invention: when the external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet, including:

[0118] The SAR sensor acquires the first charge change information, the second charge change information, and the third charge change information, and determines a first change value of the first suspended copper sheet 62, a second change value of the second suspended copper sheet 63, and a third change value of the third suspended copper sheet 64;

[0119] Sorting the first change value, the second change value, and the third change value to determine a sorting order;

[0120] A first distance sequence between the external object and the first suspended copper skin 62 , the second suspended copper skin 63 and the third suspended copper skin 63 is determined according to the sorting sequence.

[0121] The principle and beneficial effect of the present invention are as follows: by converting the charge change information and expressing it in the form of a change value, the change value can be compared in size, and then the distance between the external object and the suspended copper sheet can be sorted for the first time, and then the distance obtained by the first sorting can be used to check the accuracy of the distance obtained after calculation in order.

[0122] Embodiment 9:

[0123] As an embodiment of the present invention: determining the target distance between the external object and the suspended copper sheet according to the charge change information includes:

[0124] Determine the direction in which the external object is approaching based on the screen charge change information of the screen suspended copper sheet 6;

[0125] After the direction of the approaching external object is determined:

[0126] Determine the direction in which the external object approaches according to the screen charge change information of the screen suspension copper foil 6 and the screen side charge change information of the screen side suspension copper foil 61;

[0127] After the direction of the approaching external object is determined:

[0128] Calculate a first capacitance increase / decrease value of the first suspended copper sheet 62 according to the first charge change information of the first suspended copper sheet 62, and determine a first distance value between the first suspended copper sheet 62 and the external object through a preset algorithm according to the first capacitance increase / decrease value;

[0129] Calculate a second capacitance increase / decrease value of the second suspended copper sheet 63 according to the second charge change information of the second suspended copper sheet 63, and determine a second distance value between the second suspended copper sheet 63 and the external object through a preset algorithm according to the second capacitance increase / decrease value;

[0130] Calculating a third capacitance increase / decrease value of the third suspended copper skin 64 according to the third charge change information of the third suspended copper skin 64, and determining a third distance value between the third suspended copper skin 64 and the external object through a preset algorithm according to the third capacitance increase / decrease value;

[0131] Sorting the first distance value, the second distance value and the third distance value to determine a second distance order;

[0132] comparing the first distance sequence and the second distance sequence;

[0133] When the first distance sequence is the same as the second distance sequence, it indicates that the distance collection is correct, the smallest distance value among the first distance value, the second distance value and the third distance value is selected as the scene recognition distance value, and the suspended copper sheet corresponding to the smallest distance value is obtained;

[0134] When the first distance sequence is different from the second distance sequence, the charge change information of the suspended copper skin is collected again for identification.

[0135] The beneficial effect of the present invention is that after the direction is determined, the distance sorting order of the suspended copper foil corresponding to the first distance value and the second distance value should be the same. The final result of the present invention can be verified by the first distance value and the second distance value. The distance finally obtained must be the minimum distance, and the minimum distance represents the closest distance, so that it can be identified in what scenario the call is made or the mobile phone is operated, and then the direction of opening the antenna can be changed.

[0136] Embodiment 10:

[0137] As an embodiment of the present invention: the method of determining the target distance between the external object and the suspended copper sheet according to the charge change information comprises the following steps:

[0138] Step 1: Obtain the initial charge q of the first suspended copper sheet 62 10 And real-time detection of charge q 1s , the initial charge q of the second suspended copper sheet 63 20 And real-time detection of charge q 2s The initial charge q of the third suspended copper sheet 64 30 And real-time detection of charge q 3s ;

[0139] Determine the charge change Δq of the first suspended copper sheet 62 1 =q 1s -q 10 ;

[0140] Determine the charge change Δq of the second suspended copper sheet 63 2 =q 2s -q20 ;

[0141] Determine the charge change Δq of the third suspended copper sheet 64 3 =q 3s -q 30 ;

[0142] Step 2: Obtain the current values ​​of the first suspended copper sheet 62, the second suspended copper sheet 63 and the third suspended copper sheet 64; obtain the resistance value R of the first suspended copper sheet 62 1 The resistance value R of the second suspended copper sheet 63 2 The resistance value R of the third suspended copper sheet 64 3 ;

[0143] According to the charge change Δq of the first suspended copper sheet 62 1 The charge change of the second suspended copper sheet 63 is Δq 2 The charge change Δq of the third suspended copper sheet 64 3 ;

[0144] Determine the capacitance change value of the first suspended copper sheet 62 respectively

[0145] The capacitance change value of the second suspended copper sheet 63 is

[0146] The capacitance change value of the third suspended copper foil 64 is

[0147] Wherein, I represents the current value of the first suspended copper sheet 62, the second suspended copper sheet 63 and the third suspended copper sheet 64;

[0148] Step 3: According to the capacitance change value C of the first suspended copper sheet 62 1 , the capacitance change value C of the second suspended copper sheet 63 2 and the capacitance change value C of the third suspended copper foil 64 3 ;

[0149] Determine the distance between the external object and the first suspended copper sheet 62

[0150] The distance between the external object and the second suspended copper sheet 63

[0151] The distance between the external object and the third suspended copper sheet 64

[0152] Among them, the is the dielectric constant; the S 1 is the area of ​​the first suspended copper sheet 62;2 is the area of ​​the second suspended copper sheet 63; 3 is the area of ​​the third suspended copper sheet 64; the log e S 1 represents S with base e 1 The exponential of the log e S 2 represents S with base e 2 The exponential of the log e S 3 represents S with base e 3 The exponent of f is the edge effect factor, and h is the adjacent constant between adjacent suspended copper skins.

[0153] The present invention can determine the change in charge by respectively obtaining the initial charge and the real-time charge of the first suspended copper skin 62, the second suspended copper skin 63 and the third suspended copper skin 64, and then obtain the change in capacitance of the first suspended copper skin 62, the second suspended copper skin 63 and the third suspended copper skin 64 through the change in charge; finally, the target distance between the external object and the first suspended copper skin 62, the second suspended copper skin 63 and the third suspended copper skin 64 is obtained through the calculation formula of capacitance and distance, and scene recognition can be performed through the target distance.

[0154] In one embodiment, the six directions of the mobile phone when the SAR test is performed by antenna SAR detection and multi-scenario detection such as head and hand, with the screen as the reference, including screen facing down, screen facing up, screen facing right, screen facing left, screen facing forward and screen facing backward, etc., are used to determine the distance situation of each direction. We can use this patent to solve the SAR detection problem of side frame curved screen and surround screen, so as to reduce the power value through scene recognition to meet the SAR requirements, rather than directly castrating the power value to meet the SAR sensor, affecting the user experience.

[0155] In one embodiment, detection of head-hand test pattern:

[0156] As attached Figure 3 and attached Figure 4 As shown in the figure, the way to hold the phone can help identify whether the phone is held by the left hand of the head or the right hand of the head, that is, the left-hand answering scene and the right-hand answering scene. By identifying the holding state of the phone, we can use the internal switch of the phone to achieve the corresponding switching of the antenna. For example, when holding it with the right hand, we adjust it to the left antenna to transmit, and when holding it with the left hand, we adjust it to the right antenna to transmit.

[0157] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A structure under the screen, It is characterized in that It comprises a flexible circuit board, a PCB board (1), a suspended copper sheet, a SAR sensor and a middle frame (2), wherein: The flexible circuit board, the SAR sensor, the PCB board and the suspended copper sheet are arranged on the middle frame (2); One end of the flexible circuit board is connected to the PCB board (1), and the other end of the flexible circuit board is connected to the suspended copper sheet, and the suspended copper sheet is respectively connected to the middle frame (2) and the SAR sensor; the suspended copper sheet comprises a screen suspended copper sheet (6) arranged at the center of the screen and a screen side suspended copper sheet (61) arranged at the side of the screen; wherein, The screen suspended copper sheet (6) and the screen side suspended copper sheet are respectively connected to the SAR sensor, and the SAR sensor is used to obtain charge change information of the screen suspended copper sheet (6); The screen suspended copper skin (6) and the screen side suspended copper skin (61) are both formed by cutting the inner metal copper skin (4) of the screen, and the screen includes a straight screen or a curved screen; The screen-side suspended copper sheet (61) comprises a first suspended copper sheet (62), a second suspended copper sheet (63) and a third suspended copper sheet (64); wherein: The first suspended copper sheet (62), the second suspended copper sheet (63) and the third suspended copper sheet (64) are all connected to the SAR sensor; The first suspended copper sheet (62), the second suspended copper sheet (63) and the third suspended copper sheet (64) are respectively connected to different flexible circuit boards; The charge change information includes: Information on the screen charge change of the screen suspension copper sheet (6); First charge change information of the first suspended copper sheet (62); Second charge change information of the second suspended copper sheet (63); Third charge change information of the third suspended copper sheet (64); The SAR sensor is also used to obtain the first charge change information, the second charge change information and the third charge change information, and determine a first change value of the first suspended copper sheet (62), a second change value of the second suspended copper sheet (63) and a third change value of the third suspended copper sheet (64); Sorting the first change value, the second change value, and the third change value to determine a sorting order; Determining a first distance sequence between the external object and the first suspended copper sheet (62), the second suspended copper sheet (63), and the third suspended copper sheet (63) according to the sorting sequence; The charge change information is used to determine the target distance between the suspended copper sheet and the external object, and the steps are as follows: Determine the direction in which the external object is approaching based on the screen charge change information of the screen suspended copper sheet (6); After the direction of the approaching external object is determined: Calculating a first capacitance increase / decrease value of the first suspended copper sheet (62) according to first charge change information of the first suspended copper sheet (62), and determining a first distance value between the first suspended copper sheet (62) and the external object through a preset algorithm according to the first capacitance increase / decrease value; Calculating a second capacitance increase / decrease value of the second suspended copper sheet (63) according to second charge change information of the second suspended copper sheet (63), and determining a second distance value between the second suspended copper sheet (63) and the external object by a preset algorithm according to the second capacitance increase / decrease value; Calculating a third capacitance increase / decrease value of the third suspended copper sheet (64) according to change information of a third charge of the third suspended copper sheet (64), and determining a third distance value between the third suspended copper sheet (64) and the external object by a preset algorithm according to the third capacitance increase / decrease value; Sorting the first distance value, the second distance value and the third distance value to determine a second distance order; comparing the first distance sequence and the second distance sequence; When the first distance sequence is the same as the second distance sequence, it indicates that the distance collection is correct, the smallest distance value among the first distance value, the second distance value and the third distance value is selected as the scene recognition distance value, and the suspended copper sheet corresponding to the smallest distance value is obtained; When the first distance sequence is different from the second distance sequence, the charge change information of the suspended copper skin is collected again for identification.

2. The under-screen structure according to claim 1, It is characterized in that The flexible circuit board comprises a first flexible circuit board (31), a second flexible circuit board (32), a third flexible circuit board (33) and a fourth flexible circuit board (34); One end of the first flexible circuit board (31) is connected to the first suspended copper sheet (62) via a first connector, and the other end is connected to the PCB board (1). The second flexible circuit board (32) is connected to the second suspended copper sheet (63) via a second connector, and the other end of the second flexible circuit board (32) is connected to the PCB board (1); The third flexible circuit board (33) is connected to the third suspended copper sheet (64) via a third connector, and the other end of the third connector is connected to the PCB board (1). One end of the fourth flexible circuit board (34) is connected to the screen suspension copper sheet (6), and the other end is connected to the middle frame (2).

3. The under-screen structure according to claim 1, It is characterized in that The area of ​​the suspended copper sheet is not less than 50 square millimeters.

4. A mobile phone multi-scene recognition method based on an under-screen structure, using the under-screen structure described in any one of claims 1 to 3, It is characterized in that include: When an external object approaches the suspended copper sheet, the SAR sensor obtains the charge change information of the suspended copper sheet; Determine the target distance between the external object and the suspended copper sheet according to the charge change information; Scene recognition is performed according to the target distance and a preset scene distance model.

5. According to the method for multi-scene recognition of a mobile phone based on an under-screen structure according to claim 4, It is characterized in that Determining the target distance between the external object and the suspended copper sheet according to the charge change information comprises the following steps: Step 1: Obtain the initial charge q of the first suspended copper sheet (62) 10 And real-time detection of charge q 1s , the initial charge q of the second suspended copper sheet (63) 20 And real-time detection of charge q 2s The initial charge q of the third suspended copper sheet (64) 30 And real-time detection of charge q 3s ; Determine the charge change Δq of the first suspended copper sheet (62) 1 =q 1s -q 10 ; Determine the charge change Δq of the second suspended copper sheet (63) 2 =q 2s -q 20 ; Determine the charge change Δq of the third suspended copper sheet (64) 3 =q 3s -q 30 ; Step 2: Obtain the current values ​​of the first suspended copper sheet (62), the second suspended copper sheet (63) and the third suspended copper sheet (64); obtain the resistance value R of the first suspended copper sheet (62) 1 The resistance value R of the second suspended copper sheet (63) 2 The resistance value R of the third suspended copper sheet (64) 3 ; According to the charge change Δq of the first suspended copper sheet (62) 1 The charge change Δq of the second suspended copper sheet (63) 2 The charge change Δq of the third suspended copper sheet (64) 3 ; respectively determining the capacitance change value of the first suspended copper sheet (62) The capacitance change value of the second suspended copper sheet (63) The capacitance change value of the third floating copper foil (64) Wherein, I represents the current value of the first suspended copper sheet (62), the second suspended copper sheet (63) and the third suspended copper sheet (64); Step 3: Based on the capacitance change value C of the first suspended copper sheet (62), 1 , the capacitance change value C of the second suspended copper sheet (63) 2 and the capacitance change value C of the third suspended copper sheet (64) 3 ; respectively determining the distance between the external object and the first suspended copper sheet (62) The distance between the external object and the second suspended copper sheet (63) The distance between the external object and the third suspended copper sheet (64) Among them, the is the dielectric constant; the S 1 is the area of ​​the first suspended copper sheet (62); the S 2 is the area of ​​the second suspended copper sheet (63); the S 3 is the area of ​​the third suspended copper sheet (64); the log e S 1 represents S with base e 1 The exponential of the log e S 2 represents S with base e 2 The exponential of the log e S 3 represents S with base e 3 The exponent of f is the edge effect factor, and h is the adjacent constant between adjacent suspended copper skins.

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