WO2018086382A1

WO2018086382A1 - Screen backlight control system and method for smart device

Info

Publication number: WO2018086382A1
Application number: PCT/CN2017/094327
Authority: WO
Inventors: 周洪梅
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-11-11
Filing date: 2017-07-25
Publication date: 2018-05-17
Also published as: CN108076210A

Abstract

A screen backlight control system for a smart device comprises: a measuring unit, configured such that: a smart device measures a capacitance of a measure area on a display panel of the smart device by means of the measuring unit; a determining unit, configured to: compare the capacitance obtained by the measuring unit with a backlight threshold, send a first signal when the obtain capacitance is greater than a first backlight threshold, and send a second signal when the obtain capacitance is less than a second backlight threshold; a control unit, configured to: turn off the backlight of the smart device when receiving the first signal sent by the determining unit and turn on the backlight of the smart device when receiving the second signal sent by the determining unit.

Description

Screen backlight control system and method for smart device

Technical field

The present application relates to, but is not limited to, the field of communications, and in particular to a screen backlight control system and method for a smart device.

Background technique

With the rapid spread of large-screen smart devices, how to reduce the power consumption of smart devices and increase the 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 minimize the power consumption of the backlight portion.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The following design can be made during the mobile phone call: when the user is close to the screen, the screen backlight is turned off, and the user re-lights the screen when the user finishes the call away from the screen, thereby greatly saving power loss caused by the backlight portion of the screen.

The signal may be transmitted through an infrared or laser emitting source, and the distance between the user and the mobile phone is determined according to the infrared or laser data reflected by the human body received by the sensor. When the distance is close to or away from the threshold, the backlight of the screen is controlled to be turned off and on. Thereby achieving proximity detection and backlight control. This requires opening design for proximity detection on the mobile phone panel. The larger the opening is, the better the effect is. However, the large opening size will affect the aesthetics of the mobile phone. If the opening size is small, the receiving signal of the sensor will be weak. The debugging is difficult.

Other proximity detection methods can be used to measure the distance between the user and the phone panel without the need for infrared or laser signal reflection.

The present invention provides a screen backlight control system and method for a smart device that can perform backlight control of a mobile phone screen without reflection of infrared or laser signals.

The embodiment of the present application provides a screen backlight control system for a smart device, including:

a detecting unit, configured to: the smart device measures a capacitance of the detection area on the display panel of the smart device through the detecting unit;

The determining unit is configured to: compare the capacitance acquired by the detecting unit with the backlight threshold, and issue a first signal when the acquired capacitance is greater than the first backlight threshold, and issue a second signal when the acquired capacitance is less 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 determining unit, and turn on the backlight of the smart device when receiving the second signal sent by the determining unit.

In an exemplary embodiment, the detection area is located outside of the touch area on the display panel of the smart device.

In an exemplary embodiment, the detection area is located on top of the display panel of the smart device adjacent to the earpiece of the smart device.

In an exemplary embodiment, the first backlight threshold is greater than the second backlight threshold.

In an exemplary embodiment, the method further includes:

The startup unit is configured to: when the smart device is in a call state, activate the screen backlight control system.

Correspondingly, an embodiment of the present invention further provides a method for controlling a screen backlight of a smart device, including:

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

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

When the control unit receives the first signal, the smart device backlight is turned off, and when the control unit receives the second signal, the smart device backlight smart device smart device is turned on.

In an exemplary embodiment, the detection area is located outside of the touch panel of the display panel of the smart device.

In an exemplary embodiment, the detecting unit, the determining unit, and the control unit are included in a screen backlight control system of a smart device;

Before measuring the capacitance of the display panel of the smart device, it also includes:

The screen backlight control system is activated when the smart device is in a call state.

The embodiment of the present application further provides a computer readable storage medium storing computer executable instructions that implement the screen backlight control method of the smart device when the computer executable instructions are executed.

In the embodiment of the invention, the capacitor detection technology is used instead of the infrared or laser detection technology to complete the proximity detection of the screen backlight of the smart device during the call, and the printed circuit board (PCB) board on the display panel of the smart device can be used for the capacitance detection. Or the copper skin on the flexible printed circuit (FPC) board is used as a capacitive sensing device, which converts the distance between the user and the mobile phone into a capacitance change of the detecting unit, so that it is not needed on the display panel of the mobile phone. Open the hole to complete the user proximity detection. Since there is no need to open a hole in the display panel of the mobile phone, the aesthetics of the mobile phone will not be affected.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

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

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

2 is a schematic diagram of the detecting unit 110 on the FPC board;

3 is a schematic view of the detecting unit 110 on the PCB;

4(a) is a schematic front structural view of a capacitance detecting unit according to an embodiment of the present application;

4(b) is a schematic structural view of the back surface of the capacitance detecting unit according to the embodiment of the present application;

FIG. 5( a) is a schematic block diagram of a method for controlling a screen backlight of a smart device according to an embodiment of the present application;

FIG. 5(b) is a diagram showing a method for controlling a screen backlight of another smart device according to an embodiment of the present application; Intentional block diagram;

6(a) is a schematic diagram showing the appearance of a smart phone that performs screen backlight control using an infrared emitting source;

Fig. 6(b) is a schematic view showing the appearance of a smartphone that performs screen backlight control using capacitance detection.

Preferred embodiment of the present application

Embodiments of the present application will be described below with reference to the accompanying drawings.

It may be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as a process or method depicted as a flowchart. Although the flowcharts describe the operations as a sequential process, many of the operations can be implemented in parallel, concurrently or concurrently. In addition, the order of operations can be rearranged. The process may be terminated when the corresponding operation is completed, but may also have additional steps not included in the figures. The processing may correspond to methods, functions, procedures, subroutines, subroutines, and the like.

The structural and functional details disclosed herein may be merely representative and may be used for the purpose of describing exemplary embodiments of the present application. However, the embodiments of the invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

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

It is understood that the terminology used herein is for the purpose of describing the embodiments and is not intended to limit the exemplary embodiments. The singular forms "a", "an", It is also to be understood that the terms "comprise" and / or "comprising" are used to mean the presence of the recited features, integers, steps, operations, units and/or components, and do not exclude the presence or addition of one or more. Other features, integers, steps, operations, units, components, and/or combinations thereof.

It may also be mentioned that in some alternative implementations, the functions/acts noted may occur in an order different from that illustrated in the drawings. For example, two figures shown in succession may in fact be executed substantially concurrently or sometimes in the reverse order, depending on the function/acts involved.

The technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Referring to FIG. 1(a), according to an embodiment of the present application, a screen backlight control system 100 for a smart device is provided, which can measure the distance between a user and a mobile phone panel without requiring infrared or laser signal reflection. The system 100 includes a detecting unit 110, a determining unit 120, and a control unit 130.

The smart device may include, but is not limited to, a user device having a communication function, such as a smart phone or a tablet computer having a touch display area. The display area of such a mobile phone can receive touch information, and the user completes multiple operations on the mobile phone by touching the display panel. Since the power consumption of the display panel of the smart device occupies 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 during unnecessary time. The non-essential time is, for example, the time when the smart device is used for a voice call without using a headset or a hands-free. In this embodiment, optionally, the smart phone is taken as an example to explain how the screen backlight control system 100 turns off the display panel of the smart device during the unnecessary time.

The detecting unit 110 is configured to: measure a capacitance of a detection area on a display panel of the smart device; the determining unit 120 is configured to: compare the capacitance acquired by the detecting unit with a backlight threshold, when the acquired capacitance is greater than the first The first signal is sent when the backlight threshold is generated, and the second signal is sent when the acquired capacitance is less than the second backlight threshold; the control unit 130 is configured to: turn off the backlight of the smart device when receiving the first signal sent by the determining unit, when receiving The smart device backlight is turned on when the second signal sent by the unit is judged.

The elements of the system 100 will be described in detail below in conjunction with alternative embodiments.

The detecting unit 110 may be configured to: measure a capacitance of a detection area on a display panel of the smart device, where the detection area may be located on a display panel of the smart device, and may be located outside the touch area of the display panel in. This is because most of the smart devices known in the art are touch screen mobile phones, that is, the touch display screen capable of receiving the touch information of the user combines the display area and the operation area into one, and most of the touch display screens It is based on the change of capacitance of the touch panel to recognize the user's gestures and operations. Made. In the embodiment of the present invention, the capacitance change measured in order to complete the proximity detection of the backlight display and the touch recognition of the smart device may be two independent control systems, and the confusion between the two control systems may easily cause the system touch disorder. Therefore, in order to avoid mutual interference between the gesture operation recognition and the proximity detection of the backlight display, the detection area may be disposed in an area outside the touch area of the display panel of the smartphone.

Optionally, in order to improve the accuracy of the user's proximity detection, the action of the user to answer the phone can be accurately captured, and the detection area may be located at the top of the display panel of the smart device, adjacent to the earpiece of the smart device. This is because, during a call, if the user does not use the hands-free or headset, but directly on the handheld device to talk, it is likely to put the handset of the handset to the ear, then on the entire display panel of the phone, the area near the handset It is an area that is more likely to come into contact with the user's body, and can more accurately capture the action of the user to answer the call. The detection area is set near the earpiece, and the capacitance sensing is correspondingly sensitive and accurate.

The detecting unit 110 may be a capacitive sensor, which may be located inside a package housing of the smart device. Generally, the package housing may be an insulating material such as polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer ( ABS resin) and other materials. For a smart device using a metal material as the package casing, the material of the package casing above the detecting unit 110 may be an insulating material. The detecting unit 110 can utilize metal on a smart phone chip (such as a PCB board or an FPC board) as a capacitive sensing portion of the detecting unit 110, such as a copper plate on a PCB board or an FPC board, and the shape of the sensing portion can be according to a project layout space. However, it can be circular, rectangular, elliptical, and the like. When the capacitive sensing area is formed on the FPC board, the bonding surface between the FPC board and the package housing may be an actual sensing area, which may be adhesively bonded to the motherboard through a connector, as shown in FIG. 2 . When the capacitive sensing area is formed on the PCB board, the air gap existing between the capacitive sensing area and the package outer casing can be filled with conductive foam, so that the capacitive sensing area is closely adhered to the outer casing through the filling material, as shown in FIG. .

The principle that the detecting unit 110 completes the proximity detection may include: when there is no human body approaching, that is, when the user is far away from the mobile phone, the capacitance of the detecting unit 110 may include a parasitic capacitance between the copper skin of the capacitive sensing portion and the surrounding ground. For example, it may be composed of a parasitic capacitance between the copper skin of the capacitance sensing portion and the surrounding ground. At this time, the basic capacitance C0 of the detecting unit 110 is (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 copper skin; d0 is copper The distance between the skin and the ground. When there is a human body approaching, since the human body has conductive characteristics, the arrangement of the human body, the medium, and the copper skin can constitute a capacitor, which is equivalent to paralleling an additional capacitor Cuser 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, and d is the distance between the human body and the copper skin. The detection sensitivity and detection distance of the detecting unit 110 can be improved by adjusting the area of the copper sheet and adjusting the dielectric constant of the medium to accommodate different types of mobile phones.

The closer the distance between the user and the mobile phone, the larger the value of the additional capacitance Cuser, and the larger the total capacitance of the detecting unit 110 can be. Thereby, the measurement of the distance between the user and the mobile phone can be converted into the measurement of the capacitance of the detecting unit 110, and the distance between the user and the mobile phone can be determined by the capacitance change of the detecting unit 110. Measuring the distance between the user and the smart phone to satisfy the distance between the monitoring unit 110 when the user answers the phone and the mobile phone can be used as the first backlight threshold. When the capacitance of the detecting unit 110 is greater than the first backlight threshold, the description The additional capacitance is increased, the distance between the user and the mobile phone is reduced, and the user is using the smart phone to talk, and the first signal can be sent to the control unit 120 at this time. Similarly, the capacitance between the detecting 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 the user answers the call may be used as the second backlight threshold, when the capacitance of the detecting unit 110 is less than the second backlight threshold. When the additional capacitance is reduced, the distance between the user and the mobile phone is reduced, and the user ends the call, and the first signal can be sent to the control unit 120 at this time.

4(a) and 4(b) are schematic structural views showing the front and back sides of the capacitance detecting unit on the PCB board, respectively. Referring to FIG. 4(a), the top layer circuit 210 and the sensing unit 220 of the capacitance detecting unit are shown. The sensing unit 220 can be a PCB of the top layer. In this embodiment, the sensing unit 220 can be circular. The top layer circuit 210 can be located around the sensing unit 220 and is not directly connected to the sensing unit. 4(b) shows the underlying circuit 230 of the capacitance detecting unit, wherein the underlying circuit 230 can be configured to perform floor protection to shield noise interference in the circuit and the system while isolating the copper to another The conductor in one direction is close to the induction, such as a human hand touching the mobile phone on the back of the mobile phone.

The detecting unit 110 can convert the change of the distance between the user and the display panel of the mobile phone into a change in the capacitance of the detecting unit, thereby completing the proximity detection, and the capacitance detecting does not need to open a hole in the panel, so that the proximity detection does not damage the aesthetics of the mobile phone.

The determining unit 120 may be configured to: compare the capacitance acquired by the detecting unit with a backlight threshold, and issue a first signal when the acquired capacitance is greater than the first backlight threshold, when the acquired capacitance is smaller than the second back The second signal is emitted when the light threshold is reached. The first backlight threshold is greater than the second backlight threshold. Optionally, when the user approaches the detection area on the mobile phone panel, a capacitance is connected in parallel with the capacitance of the detection unit, and the capacitance of the detection unit increases. When the capacitance exceeds the first backlight threshold, the user is considered to be close to the mobile phone. The handset, in the state of making a call, may send a first signal, the first signal being used to control the backlight of the mobile phone to be turned off; correspondingly, when the user ends the call, away from the earpiece, the capacitance of the detecting unit is reduced, when the capacitance is less than the first When the backlight threshold is used, a second signal can be sent to control the backlight of the mobile phone.

Optionally, the determining unit 120, when determining that the user ends the call, can satisfy the fact that the capacitance of the detecting unit 110 is smaller than the second backlight threshold, and the capacitance of the previous time detecting unit 110 is greater than the first backlight threshold. This is because, when the user is in a call, the capacitance of the detecting unit 110 is greater than the first backlight threshold, and the user operation of the capacitance of the detecting unit 110 falling from being greater than the first backlight threshold to less than the second backlight threshold may include: the user using the smart device Move the ear to other places to indicate 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 determining unit 120 can be implemented by the digital processing circuit, and configured to: convert the change of the capacitance detected by the detecting unit 110 into a change of the voltage, and compare the voltage change with the backlight threshold to generate a corresponding control signal, and complete Analog to digital conversion. Designing a digital circuit having the above functions is a common technical means in the art, and the circuit structure will not be described herein any further, and any digital circuit capable of realizing the function can be set to realize the circuit structure.

The control unit 130 can be implemented by a control chip, 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 master chip. The function of the control unit 130 can include controlling the opening, or closing, or opening and closing of the backlight of the mobile phone according to the signal sent by the determining unit 120. The control unit used in this embodiment may be the same as the main control chip used in the art, and details are not described herein again.

FIG. 1(b) shows a screen backlight control system of another smart device according to an embodiment of the present application, wherein the system 100 further includes a startup unit 111 configured to: determine whether the smart device is in a call state; The screen backlight control system is activated when the smart device is in a call state. The startup unit 111 may also be configured to not activate the screen backlight control system when the smart device is not in a call state. The activation unit 111 only judges that the mobile phone is in a call state The screen backlight control system in the embodiment of the present invention is activated to prevent the backlight from being turned off when the user accidentally touches the capacitance detecting unit during operation, thereby improving the user experience.

Correspondingly, the embodiment of the present invention further provides a screen backlight control method for a smart device. Referring to FIG. 5( a ), the method includes the following steps:

S110. The smart device measures, by using the detecting unit, a capacitance of a detection area on a display panel of the smart device.

S120. The capacitor obtained by the detecting unit compares with the backlight threshold by the determining unit, and sends a first signal when the capacitance acquired by the determining unit is greater than the first backlight threshold, and sends a second signal when the capacitance acquired by the determining unit is less than the second backlight threshold. ;

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

The smart device may include, but is not limited to, a user device having a communication function, such as a smart phone or a tablet computer having a touch display area. The display area of such a mobile phone can receive touch information, and the user completes multiple operations on the mobile phone by touching the display panel. Since the power consumption of the display panel of the smart device occupies 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 during unnecessary time. The non-essential time is, for example, the time when the smart device is used for a voice call without using a headset or a hands-free. In this embodiment, the display panel of the smart device is selectively described in the above-mentioned non-essential time by using a smart phone as an example.

In step S110, the detection area may be located on a display panel of the smart device, and may be located in an area outside the touch area of the display panel. This is because the smart devices known in the art are mostly touch screen mobile phones, and most touch screen mobile phones recognize the gestures and operations of the user based on the capacitance change of the touch panel, and the proximity detection of the backlight display in the embodiment of the present invention. The touch recognition with the smart device can be 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 may be disposed in an area outside the touch area of the display panel of the smartphone.

Optionally, in order to improve the accuracy of the user's proximity detection, the action of the user to answer the phone can be accurately captured, and the detection area may be located at the top of the display panel of the smart device, adjacent to the earpiece of the smart device. This is because, during the call, if the user does not use the hands-free or headset, but directly When the device is talking on the phone, it is very likely that the handset of the mobile phone is placed at the ear. Then, on the entire display panel of the mobile phone, the area near the earpiece is an area that is more likely to contact the user's body, and the user can be more accurately captured. The action of the phone. The detection area is set near the earpiece, and its capacitive sensing is correspondingly sensitive and accurate.

Alternatively, step S110 may be completed by the detecting unit 110. The detecting unit 110 may be a capacitive sensor located inside the package housing of the smart device. Generally, the package housing may be an insulating material such as polycarbonate (PC, PolyCarbonate), ABS resin or the like. For a smart device using a metal material as the package casing, the material of the package casing above the detecting unit 110 may be an insulating material. The detecting unit 110 can utilize metal on a smart phone chip (such as a PCB board or an FPC board) as a capacitive sensing portion of the detecting unit 110, such as a copper plate on a PCB board or an FPC board, and the shape of the sensing portion can be according to a project layout space. However, it can be circular, rectangular, elliptical, and the like. When the capacitive sensing area is formed on the FPC board, the bonding surface between the FPC board and the package housing may be an actual sensing area, which may be adhesively bonded to the motherboard through a connector, as shown in FIG. 2 . When the capacitive sensing area is formed on the PCB board, the air gap existing between the capacitive sensing area and the package outer casing can be filled with conductive foam, so that the capacitive sensing area is closely adhered to the outer casing through the filling material, as shown in FIG. . The principle of detecting the proximity of the detecting unit 110 is as described above, and details are not described herein again.

Step S110 can convert the change of the distance between the user and the display panel of the mobile phone into a change in the capacitance of the detecting unit, thereby completing the proximity detection, and the capacitance detection does not need to open a hole in the panel, so that the proximity detection does not damage the aesthetics of the mobile phone.

In step S120, the capacitance acquired by the detecting unit may be compared with a backlight threshold, a first signal is sent when the acquired capacitance is greater than the first backlight threshold, and a second signal is generated when the acquired capacitance is less than the second backlight threshold. The first backlight threshold is greater than the second backlight threshold. Optionally, when the user approaches the detection area on the mobile phone panel, a capacitance is connected in parallel with the capacitance of the detection unit, and the capacitance of the detection unit increases. When the capacitance exceeds the first backlight threshold, the user is considered to be close to the mobile phone. The handset, in the state of making a call, may send a first signal, the first signal being used to control the backlight of the mobile phone to be turned off; correspondingly, when the user ends the call, away from the earpiece, the capacitance of the detecting unit is reduced, when the capacitance is less than the first When the backlight threshold is used, a second signal can be sent to control the backlight of the mobile phone.

Optionally, when it is determined in step S120 that the user ends the call, in addition to satisfying the detecting unit 110 The measured capacitance is smaller than the second backlight threshold, and can also satisfy that the capacitance of the previous time detecting unit 110 is greater than the first backlight threshold. This is because, when the user is in a call, the capacitance of the detecting unit 110 is greater than the first backlight threshold, and the user operation of the capacitance of the detecting unit 110 falling from being greater than the first backlight threshold to less than the second backlight threshold may include: the user using the smart device Move the ear to other places to indicate 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 of the capacitance detected in step S110 is converted into a voltage change, and the corresponding control signal is generated according to the voltage change compared with the backlight threshold, and the analog to digital conversion is completed. . Designing a digital circuit having the above functions is a common technical means in the art, and the circuit structure will not be described herein any further, and any digital circuit capable of realizing the function can be set to realize the circuit structure.

Step S130 can be implemented by the control chip, 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 S130 can be implemented by the main control chip. The function of the main control chip can include the signal sent in step S120 to control the opening of the backlight of the mobile phone, or to turn off, or to turn on and off. The control unit used in this embodiment may be the same as the main control chip used in the art, and details are not described herein again.

FIG. 5(b) illustrates a screen backlight control method of another smart device according to an embodiment of the present application, wherein the detecting unit, the determining unit, and the control unit may be included in a screen backlight control system of the smart device, before step S110. The method may further include the step S111: determining whether the smart device is in a call state; and when the smart device is in a call state, starting the screen backlight control system. Step S111 may further include: when the smart device is not in a call state, the screen backlight control system is not activated. In step S111, the screen backlight control system in the embodiment of the present invention is activated only when it is determined that the mobile phone is in a call state, so as to prevent the backlight from being turned off when the user accidentally touches the capacitance detecting unit during operation, thereby improving the user experience.

Alternatively, before step S110, the method may further include: determining whether the smart device is in a call state; and when the smart device is in a call state, entering a step of measuring, by the detecting unit, a capacitance of a detection area on a display panel of the smart device; When the smart device is not in a call state, the step of measuring the capacitance of the detection area on the display panel of the smart device by the detecting unit is not entered.

FIG. 6(a) is a schematic diagram of the appearance of a smart phone that performs screen backlight control using an infrared emitting source. Wherein, on the display panel of the mobile phone, there may be a light through hole 600, which is arranged to emit and receive infrared rays, and determine 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. FIG. 6(b) is a schematic diagram of the appearance of a smart phone that is close to the screen backlight control by using the capacitance detection. It can be seen that the technical solution provided by the embodiment of the present invention does not need to reserve a light through hole on the display panel of the mobile phone, thereby greatly improving the The aesthetics of the smartphone.

The embodiment of the invention uses the capacitance detection technology to replace the infrared or laser detection technology known in the art to complete the proximity detection of the smart device to turn off the screen backlight during the call, and the capacitance detection can be performed on the PCB board or the FPC board on the display panel of the smart device. As the capacitive sensing device, the copper skin transforms the distance between the user and the mobile phone into the capacitance change of the detecting unit, so that the user proximity detection can be completed without opening a hole in the display panel of the mobile phone. Since there is no need to open a hole in the display panel of the mobile phone, the aesthetics of the mobile phone will not be affected.

It is understood that the embodiments of the present invention are not limited to the details of the above-described exemplary embodiments, and the embodiments of the present invention can be implemented in other specific forms. Therefore, the present embodiments are to be considered in all respects as illustrative and not restrictive Within the examples. Any reference signs in the claims should not be construed as limiting the claim. In addition, the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or devices recited in the system claims can also be implemented by a unit or device by software or hardware. The first, second, etc. words are used to denote names and do not denote any particular order.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, processor, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using an integrated circuit, and the steps may be separately fabricated into integrated circuit modules, or multiple modules thereof or The steps are made into a single integrated circuit module.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

A person skilled in the art can understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application. The scope of protection of this application is defined by the scope defined by the claims.

Industrial applicability

In the embodiment of the present application, the capacitor detection technology is used instead of the infrared or laser detection technology to complete the proximity detection of the screen backlight when the smart device is in a call, and the capacitor can be used as a capacitor on the PCB board of the smart device display panel or the copper plate on the FPC board. The sensing device converts the distance between the user and the mobile phone into a capacitance change of the detecting unit, so that the user proximity detection can be completed without opening a hole in the display panel of the mobile phone. Since there is no need to open a hole in the display panel of the mobile phone, the aesthetics of the mobile phone will not be affected.

Claims

A screen backlight control system for a smart device, comprising:

a detecting unit, configured to: the smart device measures a capacitance of the detection area on the display panel of the smart device through the detecting unit;

The determining unit is configured to: compare the capacitance acquired by the detecting unit with the backlight threshold, and issue a first signal when the acquired capacitance is greater than the first backlight threshold, and issue a second signal when the acquired capacitance is less 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 determining unit, and turn on the backlight of the smart device when receiving the second signal sent by the determining unit.
The screen backlight control system according to claim 1, wherein the detection area is located in an area outside the touch area on the display panel of the smart device.
The screen backlight control system of claim 2, wherein the detection area is located on top of the display panel of the smart device adjacent to the earpiece of the smart device.
The screen backlight control system of claim 1, wherein the first backlight threshold is greater than the second backlight threshold.
The screen backlight control system of claim 1 further comprising:

The startup unit is configured to: when the smart device is in a call state, activate the screen backlight control system.
A screen backlight control method for a smart device, comprising:

Measuring, by the detecting unit, a capacitance of a detection area on a display panel of the smart device;

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

The smart device backlight is turned off when the control unit receives the first signal, and the smart device backlight is turned on when the control unit receives the second signal.
The screen backlight control method according to claim 6, wherein the detection area is located in an area outside the touch area on the display panel of the smart device.
The screen backlight control method according to claim 7, wherein the detection area is located at the top of the display panel of the smart device adjacent to the earpiece of the smart device.
The screen backlight control method according to claim 6, wherein the first backlight threshold is greater than the second backlight threshold.
A screen backlight control method according to claim 7, wherein

The detecting unit, the determining unit and the control unit are included in a screen backlight control system of the smart device;

Before the measuring the capacitance of the display panel of the smart device, the method further includes:

The screen backlight control system is activated when the smart device is in a call state.