CN108076210A - The screen backlight control system and method for smart machine - Google Patents

Abstract

The invention provides a screen backlight control system and method of an intelligent device. The system includes: a detection unit, used for the smart device to measure the capacitance of the detection area on the display panel of the smart device through the detection unit; a judgment unit, used for comparing the capacitance obtained by the detection unit with the backlight threshold, and when the obtained capacitance is greater than The first signal is sent when the first backlight threshold is reached, and the second signal is sent when the obtained capacitance is less than the second backlight threshold; the control unit is used to turn off the backlight of the smart device when receiving the first signal sent by the judging unit, and when receiving the judgment Turn on the backlight of the smart device when the second signal sent by the unit. The invention converts the distance transformation between the user and the mobile phone into the capacitance change of the detection unit, so that the user's proximity detection can be completed without opening a hole on the display panel of the mobile phone, and effectively solves the problem that the proximity detection in the prior art affects the appearance of the mobile phone question.

Description

Screen backlight control system and method for smart devices

technical field

The present invention relates to the communication field, in particular to a screen backlight control system and method of an intelligent device.

Background technique

With the rapid popularization of large-screen smart devices, how to reduce the power consumption of smart devices and increase battery life has become a key technical issue to improve the performance of smart devices. Taking a smart phone as an example, the power consumption of the screen backlight accounts for a large proportion of the overall power consumption of the mobile phone, and it is necessary to reduce the power consumption of the backlight part as much as possible. In the existing technology, the following design is carried out during a mobile phone call: when the user is close to the screen, the screen backlight is turned off, and the screen is re-lit when the user ends the call and moves away from the screen, which can greatly save the power loss caused by the screen backlight.

Since the proximity detection and backlight control adopted in the prior art transmit signals through infrared or laser emitting sources, the distance between the user and the mobile phone is judged according to the infrared or laser data reflected by the human body received by the sensor. When away from the threshold, control the turning off and turning on of the screen backlight. In this method, a hole design must be made on the panel of the mobile phone for proximity detection. The larger the hole, the better the effect, but at the same time, a large hole size will affect the appearance of the mobile phone. The signal becomes weak and debugging is difficult.

Therefore, there is an urgent need to provide a new proximity detection method that can measure the distance between the user and the panel of the mobile phone without the reflection of infrared or laser signals.

Contents of the invention

The main purpose of the present invention is to provide a screen backlight control system of an intelligent device, which can complete the backlight control of the mobile phone screen without infrared or laser signal reflection. The system includes:

The detection unit is used for the smart device to measure the capacitance of the detection area on the display panel of the smart device through the detection unit;

A judging unit, configured to compare the capacitance obtained by the detection unit with the backlight threshold, send a first signal when the obtained capacitance is greater than the first backlight threshold, and send a second signal when the obtained capacitance is smaller than the second backlight threshold;

The control unit is configured to turn off the backlight of the smart device when receiving the first signal sent by the judging unit, and turn on the backlight of the smart device when receiving the second signal sent by the judging unit.

According to an aspect of the present invention, wherein the detection area is located in an area outside the touch area on the display panel of the smart device.

According to an aspect of the present invention, the detection area is located on the top of the display panel of the smart device, adjacent to the earpiece of the smart device.

According to an aspect of the present invention, wherein the first backlight threshold is greater than the second backlight threshold.

According to an aspect of the present invention, wherein, also include:

The starting unit is used to start the screen backlight control system when the smart device is in a talking state.

Correspondingly, the present invention also provides a method for controlling the screen backlight of a smart device, which is characterized in that it includes:

The smart device measures the capacitance of the detection area on the display panel of the smart device through the detection unit;

The judgment unit compares the obtained capacitance with the backlight threshold, and when the obtained capacitance is greater than the first backlight threshold, the judgment unit sends a first signal, and when the obtained capacitance is smaller than the second backlight threshold, the judgment unit sends a second signal;

Turn off the backlight of the smart device when the control unit receives the first signal, and turn on the backlight of the smart device when the control unit receives the second signal.

According to an aspect of the present invention, wherein the detection area is located in an area outside the touch area of the display panel of the smart device.

According to an aspect of the present invention, the detection area is located on the top of the display panel of the smart device, adjacent to the earpiece of the smart device.

According to an aspect of the present invention, wherein the first backlight threshold is greater than the second backlight threshold.

According to one aspect of the present invention, wherein, before measuring the capacitance of the display panel of the smart device, it also includes:

When the smart device is in a talking state, the detection unit measures the capacitance of the detection area on the display panel of the smart device.

The present invention uses capacitive detection technology to replace the infrared or laser detection technology in the prior art to complete the proximity detection of turning off the backlight of the screen when the smart device is talking, because the capacitance detection can pass through the copper on the PCB board or the FPC board on the smart device display panel. As a capacitive sensing device, the skin converts the distance between the user and the mobile phone into the capacitance change of the detection unit, so that the user's proximity detection can be completed without opening a hole in the display panel of the mobile phone, which effectively solves the problem of proximity detection in the prior art. A problem that affects the aesthetics of the phone.

Description of drawings

FIG. 1(a) is a schematic block diagram of a screen backlight control system of a smart device according to an embodiment of the present invention;

Fig. 1(b) is a schematic block diagram of a screen backlight control system of a smart device according to another embodiment of the present invention;

Fig. 2 is the schematic diagram that is done on the FPC board detection unit 110 of an embodiment of the present invention;

Fig. 3 is the schematic diagram that is done on the PCB board detection unit 110 of an embodiment of the present invention;

Fig. 4 (a) is the front structure schematic diagram of the capacitance detection unit of an embodiment of the present invention;

Fig. 4 (b) is the back structure schematic diagram of the capacitance detection unit of an embodiment of the present invention;

Fig. 5(a) is a schematic block diagram of a screen backlight control method of a smart device according to an embodiment of the present invention;

FIG. 5(b) is a schematic block diagram of a screen backlight control method of a smart device according to another embodiment of the present invention;

Fig. 6(a) is a schematic diagram of the appearance of a smart phone using an infrared emission source to control the screen backlight in the prior art;

FIG. 6( b ) is a schematic diagram of the appearance of a smart phone using capacitance detection to control the screen backlight in an embodiment of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations as sequential processing, many of the operations may be performed in parallel, concurrently, or simultaneously. In addition, the order of operations can be rearranged. The process may be terminated when its operations are complete, but may also have additional steps not included in the figure. The processing may correspond to a method, function, procedure, subroutine, subroutine, or the like.

Specific structural and functional details disclosed herein are representative only and for purposes of describing example embodiments of the present invention. This invention may, however, be embodied in many alternative forms and should not be construed as limited to only the embodiments set forth herein.

It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "an" are intended to include the plural unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and/or "comprising" as used herein specify the presence of stated features, integers, steps, operations, units and/or components, but do not exclude the presence or addition of one or more Other features, integers, steps, operations, units, components and/or combinations thereof.

It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.

The technical scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1(a), according to an embodiment of the present invention, a screen backlight control system 100 of a smart device is provided, and the system 100 can measure the distance between the user and the panel of the mobile phone without infrared or laser signal reflection. distance. Specifically, the system 100 includes a detection unit 110 , a judgment unit 120 and a control unit 130 .

The smart device includes, but is not limited to, a smart phone with a touch display area, a tablet computer, and other user equipment with a communication function. The display area of this type of mobile phone can receive touch information, and the user can complete various operations on the mobile phone by touching the display panel. Since the power consumption of the display panel of the smart device accounts for a large part of the total power consumption of the smart device, it is necessary to turn off the display panel of the smart device as much as possible at non-essential time. The non-essential time is, for example, using a smart device to make a voice call without using a headset or hands-free. In this embodiment, preferably, a smart phone is taken as an example to describe in detail how the screen backlight control system 100 turns off the display panel of the smart device at the above unnecessary time.

Wherein, the detection unit 110 is used to measure the capacitance of the detection area on the display panel of the smart device; the judgment unit 120 is used to compare the capacitance obtained by the detection unit with the backlight threshold, and when the obtained capacitance is greater than the first backlight threshold When the obtained capacitance is less than the second backlight threshold, the second signal is sent; the control unit 130 is used to turn off the backlight of the smart device when receiving the first signal sent by the judging unit; Turn on the backlight of the smart device when the second signal is received.

Each unit of the system 100 will be described in detail below in conjunction with specific embodiments.

The detection unit 110 is used to measure the capacitance of the detection area on the display panel of the smart device. Specifically, the detection area is located on the display panel of the smart device and is located in an area outside the touch area of the display panel. This is because most of the existing smart devices are touch-screen mobile phones, that is, a touch-sensitive display screen capable of receiving user touch information is used to combine the display area and the operation area into one, and most touch-sensitive display screens are based on The capacitance change of the touch panel recognizes the user's gestures and operations. In the present invention, the capacitance change measured for the proximity detection of the backlight display and the touch recognition of the smart device are two independent control systems, and confusion between the two can easily lead to system touch confusion. Therefore, in order to avoid mutual interference between the gesture operation recognition and the proximity detection of the backlight display, the detection area is set in an area outside the touch area of the display panel of the smart phone.

Preferably, in order to improve the accuracy of user proximity detection and accurately capture the action of the user answering the phone, the detection area is located at the top of the display panel of the smart device and adjacent to the earpiece of the smart device. This is because, during a call, if the user uses a hands-free or earphone, but directly holds the device to make a call, the earpiece of the mobile phone must be placed next to the ear, so on the entire display panel of the mobile phone, the area near the earpiece is The area most likely to touch the user's body can most accurately capture the action of the user answering the phone. The detection area is set near the earpiece, and its capacitive sensing is correspondingly the most sensitive and the accuracy is higher.

Specifically, the detection unit 110 may be a capacitive sensor, located inside the package of the smart device. Usually, the package is made of insulating materials, such as polycarbonate (PC), ABS resin and other materials. For a smart device that uses a metal material as the packaging shell, the material of the packaging shell located above the detection unit 110 is an insulating material. The capacitance sensing part of the detection unit 110 utilizes the metal on the smart phone chip (such as a PCB board or an FPC board) as a capacitance sensing part, such as the copper skin on a PCB board or an FPC board, and the shape of the sensing part depends on the project layout space , which can be a circle, rectangle, ellipse, and so on. When the capacitive sensing area is made on the FPC board, the bonding surface between the FPC board and the package shell is the actual sensing area, which is pasted with adhesive and connected to the main board through a connector, as shown in Figure 2. When the capacitive sensing area is built on the PCB, the air gap between the capacitive sensing area and the package shell needs to be filled with conductive foam, so that the capacitive sensing area can be closely attached to the shell through the filling material, as shown in Figure 3 .

The detection principle of the detection unit 110 is as follows: when there is no human body approaching, that is, the user is far away from the mobile phone, the capacitance of the detection unit 110 is composed of the parasitic capacitance between the copper skin of the capacitance sensing part and the surrounding ground. The basic capacitance C0 of the hour detection unit 110=(ε0*A)/d0. Where ε0 is the dielectric constant of free space, defined as 8.85×10-12F/m; A is the sensing area of the copper skin; d0 is the distance between the copper skin and the ground. When a human body approaches, since the human body has conductive properties, the human body-dielectric-copper skin constitutes a capacitor, which is equivalent to connecting an accessory capacitor Cuser in parallel on the basis of the original parasitic capacitance, Cuser=(ε0*εr*A)/d. Where εr is the dielectric constant of the medium between the human body and the copper skin and d is the distance between the human body and the copper skin. The detection sensitivity and detection distance of the detection unit 110 can be improved by adjusting the area of the copper skin and the dielectric constant of the medium, so as to adapt to different types of mobile phones.

The closer the distance between the user and the mobile phone is, the greater the value of the additional capacitance Cuser is, and the greater the total capacitance of the detection unit 110 is. Therefore, the measurement of the distance between the user and the mobile phone is converted into the measurement of the capacitance of the detection unit 110 , and the distance between the user and the mobile phone is judged by the change of the capacitance of the detection unit 110 . The capacitance between the monitoring unit 110 measured when the distance between the user and the smartphone satisfies the distance between the user and the mobile phone when answering the call is taken as the first backlight threshold, and when the capacitance of the detection unit 110 is greater than the first backlight threshold, an additional The capacitance increases, the distance between the user and the mobile phone decreases, and the user is using the smart phone to talk, at this time, a first signal is sent to the control unit 120 . Similarly, measure the capacitance between the detection unit 110 when the distance between the user and the smart phone is greater than the distance between the user and the mobile phone when answering the call as the second backlight threshold, when the capacitance of the detection unit 110 is smaller than the second backlight threshold , indicating that the additional capacitance decreases, the distance between the user and the mobile phone decreases, and the user ends the call, at this time, a first signal is sent to the control unit 120 .

FIG. 4( a ) and FIG. 4( b ) respectively show the front and back structural schematic diagrams of the capacitance detection unit built on the PCB. Referring to FIG. 4( a ), the top circuit 210 and the sensing unit 220 of the capacitance detection unit are shown. Wherein, the sensing unit 220 is the top PCB copper skin, and in this embodiment, the sensing unit 220 is circular. The top circuit 210 is located around the sensing unit 220 and is not directly connected to the sensing unit. Fig. 4 (b) shows the bottom circuit 230 of the capacitance detection unit, wherein the bottom circuit 230 is used for ground protection, which can shield the noise interference in the circuit and system, while isolating the copper sheet to the other direction Conductor proximity sensing, such as human hands touching the phone on the back of the phone.

The detection unit 110 can convert the distance change between the user and the display panel of the mobile phone into the capacitance change of the detection unit, thereby completing the proximity detection. Compared with the prior art, the capacitance detection does not need to open holes on the panel, which solves the problem of In the prior art, proximity detection destroys the beauty of mobile phones.

The judging unit 120 is used to compare the capacitance obtained by the detection unit with the backlight threshold, send a first signal when the obtained capacitance is greater than the first backlight threshold, and send a second signal when the obtained capacitance is smaller than the second backlight threshold. The first backlight threshold is greater than the second backlight threshold. Specifically, when the user approaches the detection area on the panel of the mobile phone, it is equivalent to connecting a capacitor in parallel to the capacitance of the detection unit, and the capacitance of the detection unit increases. When the capacitance exceeds the first backlight threshold, it is considered that the user is close to the handset of the mobile phone , in the state of making a call, the first signal is sent, and the first signal is used to control the backlight of the mobile phone to be turned off; correspondingly, when the user ends the call and moves away from the handset, the capacitance of the detection unit decreases, and when the capacitance is smaller than the second backlight When the threshold is reached, a second signal is sent to control and turn on the backlight of the mobile phone.

Preferably, when the judging unit 120 judges that the user ends the call, in addition to satisfying that the capacitance of the detection unit 110 is smaller than the second backlight threshold, the capacitance of the detection unit 110 at the previous moment is greater than the first backlight threshold. This is because, when the user is talking, the capacitance of the detection unit 110 must be greater than the first backlight threshold, and the corresponding user operation when the capacitance of the detection unit 110 drops from greater than the first backlight threshold to less than the second backlight threshold is: the user uses the smart device to If the ear moves to other places, it means that the user ends the call. This judgment can more accurately detect the moment when the user starts and ends the call, so that the time of backlight control is more accurate.

The judging unit 120 can be realized by a digital processing circuit, and is used to convert the change of capacitance detected by the detection unit 110 into a change of voltage, and compare the voltage change with the backlight threshold to generate a corresponding control signal to complete the simulation. Quantity to digital conversion. Designing and completing a digital circuit with the above functions is a common technical means in this field, and the specific circuit structure will not be repeated here. Any digital circuit that can realize this function can be used to realize the present invention, and it cannot be interpreted as a limitation of the present invention .

The control unit 130 can be realized by a control chip, and can turn off the backlight of the mobile phone when receiving the first signal, and turn on the backlight of the mobile phone when receiving the second signal. The control unit 130 can be implemented by a main control chip, and its function is to control the opening and/or closing of the backlight of the mobile phone according to the signal sent by the judging unit 120 . The control unit used in this embodiment is the same as the main control chip used in the prior art, and will not be repeated here.

Fig. 1(b) shows another embodiment of the present invention, wherein the system 100 further includes an activation unit 111 configured to activate the screen backlight control system when the smart device is in a call state. The purpose of the activation unit 111 is to activate the screen backlight control system of the present invention only when it is determined that the mobile phone is in a call state, so as to avoid backlight shutdown caused by the user accidentally touching the capacitance detection unit during operation, and improve user experience.

Correspondingly, the present invention also provides a screen backlight control method of a smart device, see FIG. 5(a), the method includes the following steps:

S110, the smart device measures the capacitance of the detection area on the display panel of the smart device through the detection unit;

S120. Using the judgment unit to compare the capacitance obtained by the detection unit with the backlight threshold, when the capacitance obtained by the judgment unit is greater than the first backlight threshold, a first signal is sent, and when the capacitance obtained by the judgment unit is smaller than the second backlight threshold, a second signal is sent ;

S130. Turn off the backlight of the smart device when the control unit receives the first signal, and turn on the backlight of the smart device when the control unit receives the second signal.

Wherein, the smart device includes, but is not limited to, a smart phone with a touch display area, a tablet computer, and other user equipment with a communication function. The display area of this type of mobile phone can receive touch information, and the user can complete various operations on the mobile phone by touching the display panel. Since the power consumption of the display panel of the smart device accounts for a large part of the total power consumption of the smart device, it is necessary to turn off the display panel of the smart device as much as possible at non-essential time. The non-essential time is, for example, using a smart device to make a voice call without using a headset or hands-free. In this embodiment, preferably, a smart phone is taken as an example to describe in detail how to turn off the display panel of the smart device at the above unnecessary time.

In step S110, the detection area is located on the display panel of the smart device, and is located in an area outside the touch area of the display panel. This is because most of the existing smart devices are touch-screen mobile phones, and most touch-screen mobile phones recognize the user's gesture and operation based on the capacitance change of the touch panel, and the proximity detection of the backlight display in the present invention is similar to that of the smart device. Touch recognition is two independent control systems. Therefore, in order to avoid mutual interference between the gesture operation recognition and the proximity detection of the backlight display, the detection area is set in an area outside the touch area of the display panel of the smart phone.

Preferably, in order to improve the accuracy of user proximity detection and accurately capture the action of the user answering the phone, the detection area is located at the top of the display panel of the smart device and adjacent to the earpiece of the smart device. This is because, during a call, if the user uses a hands-free or earphone, but directly holds the device to make a call, the earpiece of the mobile phone must be placed next to the ear, so on the entire display panel of the mobile phone, the area near the earpiece is The area most likely to touch the user's body can most accurately capture the action of the user answering the phone. The detection area is set near the earpiece, and its capacitive sensing is correspondingly the most sensitive and the accuracy is higher.

Specifically, step S110 is completed by the detection unit 110 . The detection unit 110 may be a capacitive sensor, located inside the packaging casing of the smart device. Usually, the packaging casing is made of insulating materials, such as polycarbonate (PC), ABS resin and other materials. For a smart device that uses a metal material as the packaging shell, the material of the packaging shell located above the detection unit 110 is an insulating material. The capacitance sensing part of the detection unit 110 utilizes the metal on the smart phone chip (such as a PCB board or an FPC board) as a capacitance sensing part, such as the copper skin on a PCB board or an FPC board, and the shape of the sensing part depends on the project layout space , which can be a circle, rectangle, ellipse, and so on. When the capacitive sensing area is made on the FPC board, the bonding surface between the FPC board and the package shell is the actual sensing area, which is pasted with adhesive and connected to the main board through a connector, as shown in Figure 2. When the capacitive sensing area is built on the PCB, the air gap between the capacitive sensing area and the package shell needs to be filled with conductive foam, so that the capacitive sensing area can be closely attached to the shell through the filling material, as shown in Figure 3 . The detection principle of the detection unit 110 is as described above, and will not be repeated here.

Step S110 can convert the distance change between the user and the display panel of the mobile phone into the capacitance change of the detection unit, thereby completing the proximity detection. Compared with the existing technology, the capacitance detection does not need to open holes on the panel, which solves the problem of the existing technology. Proximity detection in the middle of the problem destroys the aesthetics of the phone.

In step S120, compare the capacitance obtained by the detection unit with the backlight threshold, and send a first signal when the obtained capacitance is greater than the first backlight threshold, and send a second signal when the obtained capacitance is smaller than the second backlight threshold. The first backlight threshold is greater than the second backlight threshold. Specifically, when the user approaches the detection area on the panel of the mobile phone, it is equivalent to connecting a capacitor in parallel to the capacitance of the detection unit, and the capacitance of the detection unit increases. When the capacitance exceeds the first backlight threshold, it is considered that the user is close to the handset of the mobile phone , in the state of making a call, the first signal is sent, and the first signal is used to control the backlight of the mobile phone to be turned off; correspondingly, when the user ends the call and moves away from the handset, the capacitance of the detection unit decreases, and when the capacitance is smaller than the second backlight When the threshold is reached, a second signal is sent to control and turn on the backlight of the mobile phone.

Preferably, when it is judged in step S120 that the user ends the call, in addition to satisfying that the capacitance measured by the detection unit 110 is smaller than the second backlight threshold, the capacitance of the detection unit 110 at the previous moment is greater than the first backlight threshold. This is because, when the user is talking, the capacitance of the detection unit 110 must be greater than the first backlight threshold, and the corresponding user operation when the capacitance of the detection unit 110 drops from greater than the first backlight threshold to less than the second backlight threshold is: the user uses the smart device to If the ear moves to other places, it means that the user ends the call. This judgment can more accurately detect the moment when the user starts and ends the call, so that the time of backlight control is more accurate.

Step S120 can be implemented by a digital processing circuit. The change in capacitance detected in step S110 is converted into a change in voltage, and according to the voltage change compared with the backlight threshold, a corresponding control signal is generated to complete the conversion from analog to digital. . Designing and completing a digital circuit with the above functions is a common technical means in this field, and the specific circuit structure will not be repeated here. Any digital circuit that can realize this function can be used to realize the present invention, and it cannot be interpreted as a limitation of the present invention .

Step S130 can be realized by the control chip, which can turn off the backlight of the mobile phone when receiving the first signal, and turn on the backlight of the mobile phone when receiving the second signal. S130 can be realized by the main control chip, and its function is to control the opening and/or closing of the backlight of the mobile phone by the signal sent in step S120. The control unit used in this embodiment is the same as the main control chip used in the prior art, and will not be repeated here.

Fig. 5(b) shows a screen backlight control method of a smart device in another embodiment of the present invention, wherein, before step S110, a step S111 is also included: when the smart device is in a call state, start the screen Backlight control system. The purpose of S111 is to activate the screen backlight control system of the present invention only when it is determined that the mobile phone is in a call state, so as to avoid turning off the backlight caused by the user accidentally touching the capacitance detection unit during operation, and improve user experience.

Fig. 6(a) is a schematic diagram of the appearance of a smart phone using an infrared emitting source to control the screen backlight in the prior art. Wherein, on the display panel of the mobile phone, there is an optical hole 600 for emitting and receiving infrared rays, and judging the distance between the user and the mobile phone according to the infrared or laser data reflected by the human body received by the sensor. Figure 6(b) is a schematic diagram of the appearance of a smart phone that uses capacitive detection to complete backlight control close to the screen in an embodiment of the present invention. It can be seen that the technical solution provided by the present invention does not need to reserve a light through hole on the display panel of the mobile phone , greatly enhancing the aesthetics of the smartphone.

The present invention uses capacitive detection technology to replace the infrared or laser detection technology in the prior art to complete the proximity detection of the smart device turning off the screen backlight during a call, because the capacitance detection can pass through the copper on the PCB board or the FPC board on the smart device display panel. As a capacitive sensing device, the skin converts the distance between the user and the mobile phone into the capacitance change of the detection unit, so that the user's proximity detection can be completed without opening a hole in the display panel of the mobile phone, which effectively solves the problem of proximity detection in the prior art. A problem that affects the aesthetics of the phone.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned. In addition, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or devices stated in the system claims may also be realized by one unit or device through software or hardware. The words first, second, etc. are used to denote names and do not imply any particular order.

Claims (10)

1. a kind of screen backlight control system of smart machine, which is characterized in that including：

Detection unit measures the electricity of the detection zone on the display panel of smart machine for smart machine by detection unit Hold；

Judging unit, for the capacitance that detection unit obtains to be compared with backlight threshold value, when the capacitance of acquisition is more than first back of the body The first signal is sent during photo threshold, secondary signal is sent when the capacitance of acquisition is less than the second backlight threshold value；

Control unit, for closing smart machine backlight when receiving the first signal that judging unit is sent, when receive judge it is single Smart machine backlight is opened during the secondary signal that member is sent.

2. screen backlight control system according to claim 1, which is characterized in that the detection zone is located at smart machine Region on display panel outside Touch Zone.

3. screen backlight control system according to claim 2, which is characterized in that the detection zone is located at smart machine It is adjacent with the receiver of smart machine at the top of display panel.

4. screen backlight control system according to claim 1, which is characterized in that the first backlight threshold value is more than described the Two backlight threshold values.

5. screen backlight control system according to claim 1, which is characterized in that further include：

Start unit, for when the smart machine is in talking state, starting the screen backlight control system.

6. a kind of screen backlight control method of smart machine, which is characterized in that including：

The capacitance of the detection zone on the display panel of smart machine is measured by detection unit；

The capacitance of acquisition with backlight threshold value is compared by judging unit, is sentenced when the capacitance of acquisition is more than the first backlight threshold value Disconnected unit sends the first signal, when acquisition capacitance be less than the second backlight threshold value when judging unit send secondary signal；

Smart machine backlight is closed when control unit receives the first signal, is opened when control unit receives secondary signal Smart machine backlight.

7. screen backlight control method according to claim 6, which is characterized in that the detection zone is located at smart machine Region on display panel outside Touch Zone.

8. screen backlight control method according to claim 7, which is characterized in that the detection zone is located at smart machine It is adjacent with the receiver of smart machine at the top of display panel.

9. screen backlight control method according to claim 6, which is characterized in that the first backlight threshold value is more than described the Two backlight threshold values.

10. screen backlight control method according to claim 7, which is characterized in that measure the display panel of smart machine Before capacitance, further include：

When the smart machine is in talking state, the display surface of smart machine is measured by detection unit by detection unit The capacitance of detection zone on plate.