CN108924319B - Proximity detection method and mobile terminal - Google Patents

Abstract

The present invention provides a proximity detection method and a mobile terminal, wherein the mobile terminal includes a dustproof net. The method includes: acquiring a target capacitance value of the dust filter; determining a target difference between the target capacitance value and a reference capacitance value, wherein the reference capacitance value is when no object is close to the dust filter , the capacitance value of the dust filter; according to the comparison result between the target difference value and the preset threshold value, it is determined whether there is an object close to the mobile terminal. In this way, the target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

Description

A proximity detection method and mobile terminal

technical field

The present invention relates to the field of communication technologies, and in particular, to a proximity detection method and a mobile terminal.

Background technique

The mobile terminal can realize the function of proximity detection through the infrared proximity sensor. For example, when answering a call, when the infrared proximity sensor in the mobile terminal detects that the face is close to the screen, the screen can be automatically blacked out. Misoperation can be avoided.

In the prior art, the infrared proximity sensor is disposed on the front of the mobile terminal. Outside the display area of the screen of the mobile terminal, a certain space is required to place the infrared proximity sensor, which limits the screen ratio of the mobile terminal. Therefore, in the prior art, the infrared proximity sensor will lead to a small screen ratio of the mobile terminal.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a proximity detection method and a mobile terminal, so as to solve the problem in the prior art that the use of an infrared proximity sensor for proximity detection results in a small screen ratio of the mobile terminal.

In order to solve the above-mentioned technical problems, the present invention is achieved in this way:

In a first aspect, an embodiment of the present invention provides a proximity detection method, which is applied to a mobile terminal, where the mobile terminal includes a dust filter, and the method includes:

Obtain the target capacitance value of the dust filter;

determining a target difference between the target capacitance value and a reference capacitance value, wherein the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter;

According to the comparison result between the target difference value and the preset threshold value, it is determined whether there is an object approaching the mobile terminal.

In a second aspect, an embodiment of the present invention further provides a mobile terminal, including:

Dust filter, capacitance detection chip and connecting wire;

The connecting wire is used to connect the dust filter and the capacitance detection chip;

The capacitance detection chip is used to obtain the target capacitance value of the dust filter;

The capacitance detection chip is used to determine the target difference between the target capacitance value and the reference capacitance value, wherein the reference capacitance value is the capacitance of the dust filter when no object is close to the dust filter. value;

The capacitance detection chip is configured to determine whether there is an object approaching the mobile terminal according to the comparison result between the target difference value and the preset threshold value.

In this way, in the embodiment of the present invention, the target capacitance value of the dustproof net is obtained; the target difference between the target capacitance value and the reference capacitance value is determined, wherein the reference capacitance value is when no object is close to the dustproof net. In the case of a net, the capacitance value of the dust net; according to the comparison result between the target difference value and the preset threshold value, it is determined whether there is an object approaching the mobile terminal. The target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

Description of drawings

1 is a flowchart of a proximity detection method provided by an embodiment of the present invention;

2 is a schematic front view of a mobile terminal provided by an embodiment of the present invention;

3 is a schematic diagram of an earpiece dust filter provided as a capacitance detection channel according to an embodiment of the present invention;

4 is a schematic diagram of an object approaching a mobile terminal from the front according to an embodiment of the present invention;

5 is a schematic diagram of a change process of the difference ΔC between the capacitance value of the earpiece dust filter and the reference capacitance value provided by an embodiment of the present invention;

6 is a flowchart of another proximity detection method provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a hardware structure of a mobile terminal according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1, FIG. 1 is a flowchart of a proximity detection method provided by an embodiment of the present invention, which is applied to a mobile terminal, and the mobile terminal includes a dustproof net. As shown in Figure 1, it includes the following steps:

Step 101: Obtain a target capacitance value of the dust filter.

In step 101, the earpiece dust filter on the front of the mobile terminal may be designed as a capacitance detection channel. When an object is close to the earpiece dust filter, the capacitance value of the earpiece dust filter will change. Proximity detection on the front and top of the mobile terminal can be achieved through the amount of change in the capacitance value of the earpiece dust filter. The earpiece dustproof net may be a metal dustproof net. As shown in FIG. 2 , it is a schematic front view of the mobile terminal. In FIG. 2, the antenna 1 of the mobile terminal and the dust filter 2 of the earpiece are shown.

As shown in Figure 3, it is a schematic diagram of the earpiece dust filter as a capacitance detection channel. In FIG. 3 , the earpiece dustproof net 2 , the capacitance detection chip 3 , the electrostatic protection device 4 , the connecting wire 5 , the main board 6 and the earpiece 7 are shown. The earpiece dust filter 2 is used as a capacitance detection channel, and can be connected to the input pin of the capacitance detection chip 3 through the connecting line 5 . Wherein, the connecting wire 5 may be a flexible printed circuit board 51 (Flexible Printed Circuit, FPC), or may be a thimble 52 . In order to prevent the capacitance detection chip 3 from being damaged by the static electricity coming from the earpiece dustproof net 2 , an electrostatic protection device 4 can be added. The selection of the electrostatic protection device 4 can be determined by the capacitance detection chip 3 . The earpiece 7 is located under the earpiece dust filter 2 .

The mobile terminal may acquire the target capacitance value of the dust filter, that is, the mobile terminal may acquire the target capacitance value of the earpiece dust filter.

Step 102: Determine a target difference between the target capacitance value and a reference capacitance value, where the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter.

In step 102, a target difference between the target capacitance value and the reference capacitance value may be determined. Among them, the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter.

Step 103: Determine whether there is an object approaching the mobile terminal according to the comparison result between the target difference value and a preset threshold value.

In step 103, the target difference value may be compared with a preset threshold value. It should be noted that the preset threshold value may include a preset first threshold value N and a preset second threshold value M, and the preset first threshold value N may be greater than the preset second threshold value M.

Whether there is an object approaching the mobile terminal may be determined according to the comparison result. As shown in FIG. 4 , it is a schematic diagram of an object approaching the mobile terminal from the front.

As shown in FIG. 5 , it is a schematic diagram of the change process of the difference ΔC between the capacitance value of the earpiece dust filter and the reference capacitance value. It is assumed that the closer the object is to the mobile terminal, the greater the capacitance value of the earpiece dust filter. In FIG. 5 , the process of the object gradually moving away from the mobile terminal → gradually approaching the mobile terminal → gradually moving away from the mobile terminal is shown. As shown in Figure 5, points A, D and E are the points where the difference between the capacitance value of the earpiece dust filter and the reference capacitance value ΔC is the preset first threshold value N; points B, C and F is the point where the difference ΔC between the capacitance value of the earpiece dust filter and the reference capacitance value is the preset second threshold value M.

When the above target difference value is greater than the preset first threshold value N, it may be determined that an object is approaching the mobile terminal. For example, at point G in FIG. 5 , the target difference ΔC corresponding to point G is greater than the preset first threshold value N, and it can be determined that the target moment corresponding to point G has an object approaching the mobile terminal.

When the above target difference value is smaller than the preset second threshold value M, it can be determined that no object is close to the mobile terminal. For example, at point H in FIG. 5 , the target difference ΔC corresponding to the point H is smaller than the preset second threshold value M, and it can be determined that there is no object close to the mobile terminal at the target moment corresponding to the point H.

When the target difference value is greater than or equal to the preset second threshold value M and less than or equal to the preset first threshold value N, the difference between the capacitance value of the dust filter and the reference capacitance value before the target capacitance value is obtained can be determined value change process. Further, it can be determined whether there is an object approaching the mobile terminal according to the change process.

For example, when the difference between the capacitance value of the dust filter and the reference capacitance value gradually becomes smaller, it can be determined that there is an object approaching the mobile terminal. For example, at point I in FIG. 5 , the target difference value ΔC corresponding to the point I is between the preset second threshold value M and the preset first threshold value N. Although the target difference ΔC corresponding to point I is already smaller than the preset first threshold value N, the difference between the capacitance value of the dust filter and the reference capacitance value before the target time corresponding to point I gradually becomes smaller, that is, from point I Before the target time corresponding to point I until the target time corresponding to point I, the object is gradually moving away from the mobile terminal. When the object reaches the position corresponding to point I, the difference ΔC between the capacitance value of the dust filter and the reference capacitance value does not drop below the preset second threshold value M, so it can be considered that there is an object at the target moment corresponding to point I close to the mobile terminal.

When the difference between the capacitance value of the dust filter and the reference capacitance value gradually increases, it can be determined that no object is close to the mobile terminal. For example, at point J in FIG. 5 , the target difference value ΔC corresponding to point J is between the preset second threshold value M and the preset first threshold value N. Although the target difference ΔC corresponding to point J is already greater than the preset second threshold value M, the difference between the capacitance value of the dust filter and the reference capacitance value before the target time corresponding to point J gradually increases, that is, from point J Before the target time corresponding to point J until the target time corresponding to point J, the object is gradually approaching the mobile terminal. When the object reaches the position corresponding to point J, the difference ΔC between the capacitance value of the dust filter and the reference capacitance value does not jump above the preset first threshold value N, so it can be considered that there is no object at the target moment corresponding to point J close to the mobile terminal.

It can be seen from the above analysis that in Figure 5, a point located above point A, point D or point E corresponds to an object approaching the mobile terminal; points located below point B, point C or point F correspond to the state of No object is close to the mobile terminal; points between points A and B, the corresponding state is that there is an object close to the mobile terminal; points between points C and D, the corresponding state is that no object is close to the mobile terminal; A point between point E and point F corresponds to an object approaching the mobile terminal.

In the embodiment of the present invention, the above-mentioned mobile terminal may be a mobile phone, a tablet computer (Tablet PersonalComputer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant, PDA for short), a mobile Internet Device (Mobile Internet Device, MID) Or wearable device (Wearable Device) and so on.

The proximity detection method according to the embodiment of the present invention is applied to a mobile terminal, where the mobile terminal includes a dust filter. Obtain a target capacitance value of the dust filter; determine a target difference between the target capacitance value and a reference capacitance value, wherein the reference capacitance value is the The capacitance value of the dust net; according to the comparison result between the target difference value and the preset threshold value, it is determined whether there is an object close to the mobile terminal. In this way, the target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

Referring to FIG. 6, FIG. 6 is a flowchart of another proximity detection method provided by an embodiment of the present invention, which is applied to a mobile terminal, and the mobile terminal includes a dustproof net. The main difference between this embodiment and the previous embodiment is that the dynamic calibration process is described in detail by detecting the change speed of the increment of the capacitance value of the dust filter in the preset time period before the target capacitance value is obtained. As shown in Figure 6, it includes the following steps:

Step 601: Obtain the target capacitance value of the dust filter.

In step 601, the earpiece dust filter on the front of the mobile terminal may be designed as a capacitance detection channel. When an object is close to the earpiece dust filter, the capacitance value of the earpiece dust filter will change. Proximity detection on the front and top of the mobile terminal can be achieved through the amount of change in the capacitance value of the earpiece dust filter. The earpiece dustproof net may be a metal dustproof net. Still taking FIG. 2 as an example, in FIG. 2 , the antenna 1 and the earpiece dust filter 2 of the mobile terminal are shown.

Still taking FIG. 3 as an example, in FIG. 3 , the earpiece dustproof net 2 , the capacitance detection chip 3 , the electrostatic protection device 4 , the connecting wire 5 , the main board 6 and the earpiece 7 are shown. The earpiece dust filter 2 is used as a capacitance detection channel, and can be connected to the input pin of the capacitance detection chip 3 through the connecting line 5 . Wherein, the connecting wire 5 may be a flexible printed circuit board 51 (Flexible Printed Circuit, FPC), or may be a thimble 52 . In order to prevent the capacitance detection chip 3 from being damaged by the static electricity coming from the earpiece dustproof net 2 , an electrostatic protection device 4 can be added. The selection of the electrostatic protection device 4 can be determined by the capacitance detection chip 3 . The earpiece 7 is located under the earpiece dust filter 2 .

The mobile terminal may acquire the target capacitance value of the dust filter, that is, the mobile terminal may acquire the target capacitance value of the earpiece dust filter.

Step 602: Detect the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is acquired.

In step 602, the mobile terminal may detect the change speed of the increment of the capacitance value of the dust filter within a preset time period before acquiring the target capacitance value.

Step 603: When the change speed is greater than or equal to a preset speed threshold, determine the target difference between the target capacitance value and the reference capacitance value, wherein the reference capacitance value is when there is no object close to the dust filter. case, the capacitance value of the dust filter.

In step 603, when the change speed is greater than or equal to the preset speed threshold, the target difference between the target capacitance value and the reference capacitance value may be determined. Among them, the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter.

Step 604: Determine whether there is an object approaching the mobile terminal according to the comparison result between the target difference value and a preset threshold value.

In step 604, the target difference value may be compared with a preset threshold value. It should be noted that the preset threshold value may include a preset first threshold value N and a preset second threshold value M, and the preset first threshold value N may be greater than the preset second threshold value M. It should be noted that if only one threshold value is set, it is very likely that the difference between the capacitance value of the dust filter and the reference capacitance value will constantly vibrate around the threshold value. Therefore, two thresholds need to be set. value, which can effectively avoid the occurrence of the above jitter.

Whether there is an object approaching the mobile terminal may be determined according to the comparison result. It is assumed that the closer the object is to the mobile terminal, the greater the capacitance value of the earpiece dust filter. Still taking FIG. 5 as an example, in FIG. 5 , a process of gradually moving away from the mobile terminal → gradually approaching the mobile terminal → gradually moving away from the mobile terminal is shown. As shown in Figure 5, points A, D and E are the points where the difference between the capacitance value of the earpiece dust filter and the reference capacitance value ΔC is the preset first threshold value N; points B, C and F is the point where the difference ΔC between the capacitance value of the earpiece dust filter and the reference capacitance value is the preset second threshold value M.

Optionally, the preset threshold value includes a preset first threshold value and a preset second threshold value, the preset first threshold value is greater than the preset second threshold value, the preset According to the comparison result between the target difference value and the preset threshold value, determining whether there is an object approaching the mobile terminal includes:

When the target difference value is greater than the preset first threshold value, it is determined that there is an object approaching the mobile terminal;

When the target difference value is smaller than the preset second threshold value, determine that no object is close to the mobile terminal;

When the target difference value is greater than or equal to the preset second threshold value and less than or equal to the preset first threshold value, determine the capacitance value of the dust filter before the target capacitance value is obtained A change process of the difference from the reference capacitance value; according to the change process, it is determined whether there is an object approaching the mobile terminal.

As mentioned above, the preset threshold value may include a preset first threshold value N and a preset second threshold value M, and the preset first threshold value N may be greater than the preset second threshold value M.

When the above target difference value is greater than the preset first threshold value N, it may be determined that an object is approaching the mobile terminal. For example, at point G in FIG. 5 , the target difference ΔC corresponding to point G is greater than the preset first threshold value N, and it can be determined that the target moment corresponding to point G has an object approaching the mobile terminal.

When the above target difference value is smaller than the preset second threshold value M, it can be determined that no object is close to the mobile terminal. For example, at point H in FIG. 5 , the target difference ΔC corresponding to the point H is smaller than the preset second threshold value M, and it can be determined that there is no object close to the mobile terminal at the target moment corresponding to the point H.

When the target difference value is greater than or equal to the preset second threshold value M and less than or equal to the preset first threshold value N, the difference between the capacitance value of the dust filter and the reference capacitance value before the target capacitance value is obtained can be determined value change process. Further, it can be determined whether there is an object approaching the mobile terminal according to the change process.

Optionally, the determining whether there is an object approaching the mobile terminal according to the change process includes:

When the difference between the capacitance value of the dust filter and the reference capacitance value gradually becomes smaller, it is determined that an object is close to the mobile terminal;

When the difference between the capacitance value of the dust filter and the reference capacitance value gradually increases, it is determined that no object is close to the mobile terminal.

For example, when the difference between the capacitance value of the dust filter and the reference capacitance value gradually becomes smaller, it can be determined that there is an object approaching the mobile terminal. For example, at point I in FIG. 5 , the target difference value ΔC corresponding to the point I is between the preset second threshold value M and the preset first threshold value N. Although the target difference ΔC corresponding to point I is already smaller than the preset first threshold value N, the difference between the capacitance value of the dust filter and the reference capacitance value before the target time corresponding to point I gradually becomes smaller, that is, from point I Before the target time corresponding to point I until the target time corresponding to point I, the object is gradually moving away from the mobile terminal. When the object reaches the position corresponding to point I, the difference ΔC between the capacitance value of the dust filter and the reference capacitance value does not drop below the preset second threshold value M, so it can be considered that there is an object at the target moment corresponding to point I close to the mobile terminal.

When the difference between the capacitance value of the dust filter and the reference capacitance value gradually increases, it can be determined that no object is close to the mobile terminal. For example, at point J in FIG. 5 , the target difference value ΔC corresponding to point J is between the preset second threshold value M and the preset first threshold value N. Although the target difference ΔC corresponding to point J is already greater than the preset second threshold value M, the difference between the capacitance value of the dust filter and the reference capacitance value before the target time corresponding to point J gradually increases, that is, from point J Before the target time corresponding to point J until the target time corresponding to point J, the object is gradually approaching the mobile terminal. When the object reaches the position corresponding to point J, the difference ΔC between the capacitance value of the dust filter and the reference capacitance value does not jump above the preset first threshold value N, so it can be considered that there is no object at the target moment corresponding to point J close to the mobile terminal.

It can be seen from the above analysis that in Figure 5, a point located above point A, point D or point E corresponds to an object approaching the mobile terminal; points located below point B, point C or point F correspond to the state of No object is close to the mobile terminal; points between points A and B, the corresponding state is that there is an object close to the mobile terminal; points between points C and D, the corresponding state is that no object is close to the mobile terminal; A point between point E and point F corresponds to an object approaching the mobile terminal.

Step 605: When the change speed is less than the preset speed threshold, determine the target capacitance value as a reference capacitance value.

In step 605, when the change speed is less than the preset speed threshold, it may be determined that the target capacitance value is the reference capacitance value.

Optionally, the method further includes:

Detect the real-time capacitance value of the dust filter at the initial moment of receiving the incoming call reminder, and determine that the real-time capacitance value is a reference capacitance value;

Alternatively, the real-time capacitance value of the dust filter is detected at the initial moment of receiving the operation of answering a call, and the real-time capacitance value is determined as a reference capacitance value.

It should be noted that the real-time capacitance value of the dust filter can be detected at the initial moment of receiving the call reminder, and then the real-time capacitance value can be determined as the reference capacitance value. For example, before receiving an incoming call alert, the detected capacitance value is C0. If some water sticks to the earpiece dust filter at this time, resulting in the detected capacitance value of C1, the capacitance increment ΔC=C1-C0. At this time, if an incoming call reminder is received, if ΔC is already greater than the preset first threshold N, the mobile terminal will incorrectly judge that an object is approaching, and the mobile terminal may automatically black out at this time. Therefore, after receiving the call reminder, C1 can be determined as the background capacitance, that is, the influence of water is treated as the background capacitance noise, and ΔC is forcibly cleared, that is, ΔC is calculated on the basis of C1. In this way, the next capacitance increment is only the capacitance increase value generated by the approach of the object, which can reduce the probability of misjudgment by the mobile terminal. Alternatively, the real-time capacitance value of the dust filter can be detected at the initial moment of receiving the operation of answering a call, and then the real-time capacitance value can be determined as a reference capacitance value.

Optionally, the reference capacitance value is a capacitance value determined according to the temperature value of the dust filter when the target capacitance value is obtained.

It should be noted that temperature has a great influence on capacitance detection, so during the detection process, it is necessary to compensate for the influence of temperature. For example, a detection channel can be added, which needs to be shielded. The channel is not sensitive to the proximity of the object, and only reflects the effect of temperature on the capacitance value. Compensation is achieved by compensating for the capacitance variation detected by the channel. At this time, the above-mentioned reference capacitance value is the capacitance value determined according to the temperature value of the dust filter when the target capacitance value is obtained.

The proximity detection method according to the embodiment of the present invention is applied to a mobile terminal, where the mobile terminal includes a dust filter. The dynamic calibration may be performed by detecting the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is acquired. The target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

An embodiment of the present invention further provides a mobile terminal, including a dust filter, a capacitance detection chip, and a connection wire; the connection wire is used to connect the dust filter and the capacitance detection chip; the capacitance detection chip is used to obtain The target capacitance value of the dust filter; the capacitance detection chip is used to determine the target difference between the target capacitance value and the reference capacitance value, wherein the reference capacitance value is when there is no object close to the dust filter. In this case, the capacitance value of the dust filter; the capacitance detection chip is used to determine whether there is an object approaching the mobile terminal according to the comparison result between the target difference value and the preset threshold value.

Still taking FIG. 3 as an example, in FIG. 3 , the earpiece dustproof net 2 , the capacitance detection chip 3 and the connecting wire 5 are shown. The earpiece dust filter 2 is used as a capacitance detection channel, and can be connected to the input pin of the capacitance detection chip 3 through the connecting line 5 .

The capacitance detection chip can obtain the target capacitance value of the dust filter, and then the capacitance detection chip can determine the target difference between the target capacitance value and the reference capacitance value. Among them, the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter. The capacitance detection chip is used to determine whether there is an object approaching the mobile terminal according to the comparison result between the target difference value and the preset threshold value.

Optionally, the preset threshold value includes a preset first threshold value and a preset second threshold value, and the preset first threshold value is greater than the preset second threshold value;

The capacitance detection chip is configured to determine that an object is approaching the mobile terminal when the target difference value is greater than the preset first threshold value;

The capacitance detection chip is configured to determine that no object approaches the mobile terminal when the target difference is less than the preset second threshold value;

The capacitance detection chip is configured to determine, when the target difference value is greater than or equal to the preset second threshold value and less than or equal to the preset first threshold value, the value before the acquisition of the target capacitance value. A change process of the difference between the capacitance value of the dust filter and the reference capacitance value; and whether an object is close to the mobile terminal is determined according to the change process.

The capacitance detection chip can compare the target difference with a preset threshold value. It should be noted that the preset threshold value may include a preset first threshold value N and a preset second threshold value M, and the preset first threshold value N may be greater than the preset second threshold value M. It should be noted that if only one threshold value is set, it is very likely that the difference between the capacitance value of the dust filter and the reference capacitance value will constantly vibrate around the threshold value. Therefore, two thresholds need to be set. value, which can effectively avoid the occurrence of the above jitter.

Whether there is an object approaching the mobile terminal may be determined according to the comparison result. It is assumed that the closer the object is to the mobile terminal, the greater the capacitance value of the earpiece dust filter. Still taking FIG. 5 as an example, in FIG. 5 , a process of gradually moving away from the mobile terminal → gradually approaching the mobile terminal → gradually moving away from the mobile terminal is shown. As shown in Figure 5, points A, D and E are the points where the difference between the capacitance value of the earpiece dust filter and the reference capacitance value ΔC is the preset first threshold value N; points B, C and F is the point where the difference ΔC between the capacitance value of the earpiece dust filter and the reference capacitance value is the preset second threshold value M.

The capacitance detection chip is used to determine that an object is approaching the mobile terminal when the target difference value is greater than the preset first threshold value N. For example, at point G in FIG. 5 , the target difference ΔC corresponding to point G is greater than the preset first threshold value N, and it can be determined that the target moment corresponding to point G has an object approaching the mobile terminal.

The capacitance detection chip is used to determine that no object is close to the mobile terminal when the target difference is smaller than the preset second threshold value M. For example, at point H in FIG. 5 , the target difference ΔC corresponding to the point H is smaller than the preset second threshold value M, and it can be determined that there is no object close to the mobile terminal at the target moment corresponding to the point H.

The capacitance detection chip is used to determine the capacitance value and reference of the dust filter before obtaining the target capacitance value when the target difference value is greater than or equal to the preset second threshold value M and less than or equal to the preset first threshold value N The change process of the difference of the capacitance value. Further, the capacitance detection chip can determine whether there is an object approaching the mobile terminal according to the change process.

Optionally, the capacitance detection chip is used to determine that an object is approaching the mobile terminal when the difference between the capacitance value of the dust filter and the reference capacitance value gradually becomes smaller;

The capacitance detection chip is used to determine that no object is close to the mobile terminal when the difference between the capacitance value of the dust filter and the reference capacitance value gradually increases.

The capacitance detection chip is used to determine that there is an object approaching the mobile terminal when the difference between the capacitance value of the dust filter and the reference capacitance value gradually becomes smaller. For example, at point I in FIG. 5 , the target difference value ΔC corresponding to the point I is between the preset second threshold value M and the preset first threshold value N. Although the target difference ΔC corresponding to point I is already smaller than the preset first threshold value N, the difference between the capacitance value of the dust filter and the reference capacitance value before the target time corresponding to point I gradually becomes smaller, that is, from point I Before the target time corresponding to point I until the target time corresponding to point I, the object is gradually moving away from the mobile terminal. When the object reaches the position corresponding to point I, the difference ΔC between the capacitance value of the dust filter and the reference capacitance value does not drop below the preset second threshold value M, so it can be considered that there is an object at the target moment corresponding to point I close to the mobile terminal.

The capacitance detection chip is used to determine that no object is close to the mobile terminal when the difference between the capacitance value of the dust filter and the reference capacitance value gradually increases. For example, at point J in FIG. 5 , the target difference value ΔC corresponding to point J is between the preset second threshold value M and the preset first threshold value N. Although the target difference ΔC corresponding to point J is already greater than the preset second threshold value M, the difference between the capacitance value of the dust filter and the reference capacitance value before the target time corresponding to point J gradually increases, that is, from point J Before the target time corresponding to point J until the target time corresponding to point J, the object is gradually approaching the mobile terminal. When the object reaches the position corresponding to point J, the difference ΔC between the capacitance value of the dust filter and the reference capacitance value does not jump above the preset first threshold value N, so it can be considered that there is no object at the target moment corresponding to point J close to the mobile terminal.

It can be seen from the above analysis that in Figure 5, a point located above point A, point D or point E corresponds to an object approaching the mobile terminal; points located below point B, point C or point F correspond to the state of No object is close to the mobile terminal; points between points A and B, the corresponding state is that there is an object close to the mobile terminal; points between points C and D, the corresponding state is that no object is close to the mobile terminal; A point between point E and point F corresponds to an object approaching the mobile terminal.

Optionally, the capacitance detection chip is used to detect the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is obtained;

The capacitance detection chip is configured to perform the step of determining the target difference between the target capacitance value and the reference capacitance value when the change speed is greater than or equal to a preset speed threshold;

The capacitance detection chip is configured to determine the target capacitance value as a reference capacitance value when the change speed is less than the preset speed threshold.

Further, the capacitance detection chip can detect the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is acquired. The capacitance detection chip is used to determine the target difference between the target capacitance value and the reference capacitance value when the change speed is greater than or equal to the preset speed threshold. Further, the capacitance detection chip can determine whether there is an object approaching the mobile terminal according to the target difference. Among them, the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter. The capacitance detection chip is used to determine the target capacitance value as the reference capacitance value when the change speed is less than the preset speed threshold.

Optionally, the capacitance detection chip is used to detect the real-time capacitance value of the dust filter at the initial moment of receiving the call reminder, and determine that the real-time capacitance value is a reference capacitance value;

Alternatively, the capacitance detection chip is configured to detect the real-time capacitance value of the dust filter at the initial moment of receiving the operation of answering a call, and determine the real-time capacitance value as a reference capacitance value.

It should be noted that the capacitance detection chip is used to detect the real-time capacitance value of the dust filter at the initial moment of receiving the call reminder, and then the capacitance detection chip can determine the real-time capacitance value as the reference capacitance value. For example, before receiving an incoming call alert, the detected capacitance value is C0. If some water sticks to the earpiece dust filter at this time, resulting in the detected capacitance value of C1, the capacitance increment ΔC=C1-C0. At this time, if an incoming call reminder is received, if ΔC is already greater than the preset first threshold N, the mobile terminal will incorrectly judge that an object is approaching, and the mobile terminal may automatically black out at this time. Therefore, after receiving the call reminder, C1 can be determined as the background capacitance, that is, the influence of water is treated as the background capacitance noise, and ΔC is forcibly cleared, that is, ΔC is calculated on the basis of C1. In this way, the next capacitance increment is only the capacitance increase value generated by the approach of the object, which can reduce the probability of misjudgment by the mobile terminal. Alternatively, the capacitance detection chip is used to detect the real-time capacitance value of the dust filter at the start of receiving the operation of answering a call, and then the capacitance detection chip can determine the real-time capacitance value as a reference capacitance value.

Optionally, the reference capacitance value is a capacitance value determined according to the temperature value of the dust filter when the target capacitance value is obtained.

It should be noted that temperature has a great influence on capacitance detection, so during the detection process, it is necessary to compensate for the influence of temperature. For example, a detection channel can be added, which needs to be shielded. The channel is not sensitive to the proximity of the object, and only reflects the effect of temperature on the capacitance value. Compensation is achieved by compensating for the capacitance variation detected by the channel. At this time, the above-mentioned reference capacitance value is the capacitance value determined according to the temperature value of the dust filter when the target capacitance value is obtained.

Optionally, the mobile terminal further includes an electrostatic resistor; a first end of the electrostatic resistor is connected to the dust filter, and a second end of the electrostatic resistor is grounded.

As shown in FIG. 3 , in order to prevent the capacitance detection chip 3 from being damaged by the static electricity coming from the earpiece dust filter 2 , an electrostatic protection device 4 can be added, that is, an electrostatic resistor 4 can be added. The first end of the electrostatic resistor 4 is connected to the dust filter, and the second end of the electrostatic resistor 4 is grounded. The selection of the electrostatic resistor 4 can be determined by the capacitance detection chip 3 .

Optionally, the connecting wire is a flexible circuit board or a thimble.

The connection wire 5 may be the flexible circuit board FPC 51 , or may be the ejector pin 52 .

The mobile terminal according to the embodiment of the present invention includes a dust filter. The dynamic calibration may be performed by detecting the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is acquired. The target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

FIG. 7 is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention.

The mobile terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, a processor 710, and Power supply 711 and other components. Those skilled in the art can understand that the structure of the mobile terminal shown in FIG. 7 does not constitute a limitation on the mobile terminal, and the mobile terminal may include more or less components than the one shown, or combine some components, or different components layout. In this embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

a processor 710, configured to obtain a target capacitance value of the dust filter;

determining a target difference between the target capacitance value and a reference capacitance value, wherein the reference capacitance value is the capacitance value of the dust filter when no object is close to the dust filter;

According to the comparison result between the target difference value and the preset threshold value, it is determined whether there is an object approaching the mobile terminal.

The dynamic calibration may be performed by detecting the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is acquired. The target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

It should be understood that, in this embodiment of the present invention, the radio frequency unit 701 can be used for receiving and sending signals during sending and receiving of information or during a call. Specifically, after receiving the downlink data from the base station, it is processed by the processor 710; The uplink data is sent to the base station. Generally, the radio frequency unit 701 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 701 can also communicate with the network and other devices through a wireless communication system.

The mobile terminal provides the user with wireless broadband Internet access through the network module 702, such as helping the user to send and receive emails, browse web pages, access streaming media, and the like.

The audio output unit 703 may convert audio data received by the radio frequency unit 701 or the network module 702 or stored in the memory 709 into audio signals and output as sound. Also, the audio output unit 703 may also provide audio output related to a specific function performed by the mobile terminal 700 (eg, call signal reception sound, message reception sound, etc.). The audio output unit 703 includes a speaker, a buzzer, a receiver, and the like.

The input unit 704 is used to receive audio or video signals. The input unit 704 may include a graphics processor (Graphics Processing Unit, GPU) 7041 and a microphone 7042. The graphics processor 7041 captures still pictures or video images obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode data is processed. The processed image frames may be displayed on the display unit 706 . The image frames processed by the graphics processor 7041 may be stored in the memory 709 (or other storage medium) or transmitted via the radio frequency unit 701 or the network module 702 . The microphone 7042 can receive sound and can process such sound into audio data. The processed audio data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 701 for output in the case of a telephone call mode.

The mobile terminal 700 also includes at least one sensor 705, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 7061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 7061 and the proximity sensor when the mobile terminal 700 is moved to the ear. / or backlight. The proximity sensor may include a dust filter, a capacitive detection chip, and a connection wire, and the connection wire is used to connect the dust filter and the capacitance detection chip. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (usually three axes), and can detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of mobile terminals (such as horizontal and vertical screen switching, related games , magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; the sensor 705 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, Infrared sensors, etc., are not repeated here.

The display unit 706 is used to display information input by the user or information provided to the user. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

The user input unit 707 may be used to receive input numerical or character information, and generate key signal input related to user settings and function control of the mobile terminal. Specifically, the user input unit 707 includes a touch panel 7071 and other input devices 7072 . The touch panel 7071, also referred to as a touch screen, can collect touch operations by the user on or near it (such as the user's finger, stylus, etc., any suitable object or attachment on or near the touch panel 7071). operate). The touch panel 7071 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller. To the processor 710, the command sent by the processor 710 is received and executed. In addition, the touch panel 7071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 7071 , the user input unit 707 may also include other input devices 7072 . Specifically, other input devices 7072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be repeated here.

Further, the touch panel 7071 can be covered on the display panel 7061. When the touch panel 7071 detects a touch operation on or near it, it transmits it to the processor 710 to determine the type of the touch event, and then the processor 710 determines the type of the touch event according to the touch The type of event provides a corresponding visual output on display panel 7061. Although in FIG. 7, the touch panel 7071 and the display panel 7061 are used as two independent components to realize the input and output functions of the mobile terminal, in some embodiments, the touch panel 7071 and the display panel 7061 may be integrated The input and output functions of the mobile terminal are implemented, which is not specifically limited here.

The interface unit 708 is an interface for connecting an external device to the mobile terminal 700 . For example, external devices may include wired or wireless headset ports, external power (or battery charger) ports, wired or wireless data ports, memory card ports, ports for connecting devices with identification modules, audio input/output (I/O) ports, video I/O ports, headphone ports, and more. The interface unit 708 may be used to receive input (eg, data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 700 or may be used between the mobile terminal 700 and the external Transfer data between devices.

The memory 709 may be used to store software programs as well as various data. The memory 709 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; Data created by the use of the mobile phone (such as audio data, phone book, etc.), etc. Additionally, memory 709 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 710 is the control center of the mobile terminal, uses various interfaces and lines to connect various parts of the entire mobile terminal, runs or executes the software programs and/or modules stored in the memory 709, and calls the data stored in the memory 709. , perform various functions of the mobile terminal and process data, so as to monitor the mobile terminal as a whole. The processor 710 may include one or more processing units; preferably, the processor 710 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem The processor mainly handles wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 710.

The mobile terminal 700 may also include a power source 711 (such as a battery) for supplying power to various components. Preferably, the power source 711 may be logically connected to the processor 710 through a power management system, so as to manage charging, discharging, and power consumption management through the power management system. and other functions.

In addition, the mobile terminal 700 includes some unshown functional modules, which are not repeated here.

Optionally, the processor 710 is further configured to:

The preset threshold value includes a preset first threshold value and a preset second threshold value, and the preset first threshold value is greater than the preset second threshold value;

When the target difference value is greater than the preset first threshold value, it is determined that there is an object approaching the mobile terminal;

When the target difference value is smaller than the preset second threshold value, determine that no object is close to the mobile terminal;

When the target difference value is greater than or equal to the preset second threshold value and less than or equal to the preset first threshold value, determine the capacitance value of the dust filter before the target capacitance value is obtained A change process of the difference from the reference capacitance value; according to the change process, it is determined whether there is an object approaching the mobile terminal.

Optionally, the processor 710 is further configured to:

When the difference between the capacitance value of the dust filter and the reference capacitance value gradually becomes smaller, it is determined that an object is close to the mobile terminal;

When the difference between the capacitance value of the dust filter and the reference capacitance value gradually increases, it is determined that no object is close to the mobile terminal.

Optionally, the processor 710 is further configured to:

Detecting the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is obtained;

When the change speed is greater than or equal to a preset speed threshold, the step of determining the target difference between the target capacitance value and the reference capacitance value is performed;

When the change speed is less than the preset speed threshold, it is determined that the target capacitance value is a reference capacitance value.

Optionally, the processor 710 is further configured to:

Detect the real-time capacitance value of the dust filter at the initial moment of receiving the incoming call reminder, and determine that the real-time capacitance value is a reference capacitance value;

Alternatively, the real-time capacitance value of the dust filter is detected at the initial moment of receiving the operation of answering a call, and the real-time capacitance value is determined as a reference capacitance value.

Optionally, the processor 710 is further configured to:

The reference capacitance value is a capacitance value determined according to the temperature value of the dust filter when the target capacitance value is obtained.

The mobile terminal 700 can implement each process implemented by the mobile terminal in the foregoing embodiments, and in order to avoid repetition, details are not repeated here. And the mobile terminal 700 can perform dynamic calibration by detecting the change speed of the increment of the capacitance value of the dust filter within a preset time period before the target capacitance value is acquired. The target capacitance value of the dust filter can be obtained, and then the target difference between the target capacitance value and the reference capacitance value can be determined. Whether there is an object approaching the mobile terminal may be determined according to the comparison result between the target difference value and the preset threshold value. Proximity detection using the dustproof net does not need to occupy additional front space of the mobile terminal, that is, the screen ratio of the mobile terminal is not limited.

Preferably, an embodiment of the present invention further provides a mobile terminal, including a processor 710, a memory 709, and a computer program stored in the memory 709 and running on the processor 710, when the computer program is executed by the processor 710 The various processes of the above-mentioned embodiments of the proximity detection method are implemented, and the same technical effect can be achieved. In order to avoid repetition, details are not repeated here.

Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, each process of the above-mentioned embodiments of the proximity detection method can be implemented, and the same technology can be achieved. The effect, in order to avoid repetition, is not repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk, or an optical disk. It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products are stored in a storage medium (such as ROM/RAM, magnetic disk, CD), including several instructions to make a mobile terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of the present invention, without departing from the spirit of the present invention and the scope protected by the claims, many forms can be made, which all belong to the protection of the present invention.

Claims (10)

1. A proximity detection method is applied to a mobile terminal, and the mobile terminal comprises a dustproof net, and is characterized by comprising the following steps:

acquiring a target capacitance value of the dustproof net;

determining a target difference value between the target capacitance value and a reference capacitance value, wherein the reference capacitance value is the capacitance value of the dust screen under the condition that no object is close to the dust screen;

determining whether an object approaches the mobile terminal or not according to a comparison result of the target difference value and a preset threshold value;

after the step of obtaining the target capacitance value of the dust screen, the method further comprises:

detecting the change speed of the increment of the capacitance value of the dustproof net in a preset time period before the target capacitance value is obtained;

when the change speed is greater than or equal to a preset speed threshold, executing the step of determining a target difference value between the target capacitance value and a reference capacitance value;

when the change speed is smaller than the preset speed threshold value, determining the target capacitance value as a reference capacitance value

Or

Detecting a real-time capacitance value of the dust screen at the starting moment of receiving the incoming call prompt, and determining the real-time capacitance value as a reference capacitance value;

or detecting a real-time capacitance value of the dustproof net at the initial moment of receiving the telephone answering operation, and determining the real-time capacitance value as a reference capacitance value.

2. The method of claim 1, wherein the preset threshold comprises a preset first threshold and a preset second threshold, the preset first threshold is greater than the preset second threshold, and the determining whether an object is close to the mobile terminal according to a comparison result between the target difference and the preset threshold comprises:

when the target difference value is larger than the preset first threshold value, determining that an object is close to the mobile terminal;

when the target difference value is smaller than the preset second threshold value, determining that no object is close to the mobile terminal;

when the target difference value is greater than or equal to the preset second threshold value and less than or equal to the preset first threshold value, determining a change process of the difference value between the capacitance value of the dust screen and the reference capacitance value before the target capacitance value is obtained; and determining whether an object approaches the mobile terminal according to the change process.

3. The method of claim 2, wherein said determining whether an object is near the mobile terminal based on the change process comprises:

when the difference value between the capacitance value of the dust screen and the reference capacitance value is gradually reduced, determining that an object is close to the mobile terminal;

and when the difference value between the capacitance value of the dustproof net and the reference capacitance value is gradually increased, determining that no object is close to the mobile terminal.

4. The method according to claim 1, wherein the reference capacitance value is a capacitance value determined according to a temperature value of the dust screen when the target capacitance value is obtained.

5. A mobile terminal, comprising:

the device comprises a dust screen, a capacitance detection chip and a connecting wire;

the connecting wire is used for connecting the dust screen and the capacitance detection chip;

the capacitance detection chip is used for acquiring a target capacitance value of the dust screen;

the capacitance detection chip is used for determining a target difference value between the target capacitance value and a reference capacitance value, wherein the reference capacitance value is the capacitance value of the dust screen under the condition that no object is close to the dust screen;

the capacitance detection chip is used for determining whether an object approaches the mobile terminal according to a comparison result of the target difference value and a preset threshold value;

the capacitance detection chip is used for detecting the change speed of the increment of the capacitance value of the dust screen in a preset time period before the target capacitance value is obtained;

the capacitance detection chip is used for executing the step of determining the target difference value between the target capacitance value and the reference capacitance value when the change speed is greater than or equal to a preset speed threshold value;

the capacitance detection chip is used for determining the target capacitance value as a reference capacitance value when the change speed is smaller than the preset speed threshold value;

or

The capacitance detection chip is used for detecting a real-time capacitance value of the dust screen at the initial moment when the incoming call prompt is received, and determining the real-time capacitance value as a reference capacitance value;

or the capacitance detection chip is used for detecting the real-time capacitance value of the dustproof net at the initial moment of receiving the telephone answering operation and determining the real-time capacitance value as the reference capacitance value.

6. The mobile terminal according to claim 5, wherein the preset threshold value comprises a preset first threshold value and a preset second threshold value, and the preset first threshold value is greater than the preset second threshold value;

the capacitance detection chip is used for determining that an object approaches the mobile terminal when the target difference value is larger than the preset first threshold value;

the capacitance detection chip is used for determining that no object is close to the mobile terminal when the target difference value is smaller than the preset second threshold value;

the capacitance detection chip is used for determining a change process of a difference value between the capacitance value of the dust screen and the reference capacitance value before the target capacitance value is acquired when the target difference value is greater than or equal to the preset second threshold value and less than or equal to the preset first threshold value; and determining whether an object approaches the mobile terminal according to the change process.

7. The mobile terminal of claim 6, wherein the capacitance detection chip is configured to determine that an object is close to the mobile terminal when a difference between the capacitance value of the dust screen and the reference capacitance value is gradually decreased;

the capacitance detection chip is used for determining that no object is close to the mobile terminal when the difference value between the capacitance value of the dust screen and the reference capacitance value is gradually increased.

8. The mobile terminal according to claim 5, wherein the reference capacitance value is a capacitance value determined according to a temperature value of the dust screen when the target capacitance value is obtained.

9. The mobile terminal of any of claims 5 to 7, wherein the mobile terminal further comprises an electrostatic impeder; the first end of the electrostatic impeder is connected with the dust screen, and the second end of the electrostatic impeder is grounded.

10. The mobile terminal according to any of claims 5 to 7, wherein the connection line is a flexible circuit board or a thimble.

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