CN217562019U

CN217562019U - Capacitance touch key circuit and mobile terminal

Info

Publication number: CN217562019U
Application number: CN202221621666.5U
Authority: CN
Inventors: 祁庆克
Original assignee: Nubia Technology Co Ltd
Current assignee: Nubia Technology Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-10-11
Anticipated expiration: 2032-06-27

Abstract

The utility model discloses an electric capacity touch key circuit and mobile terminal belongs to electric capacity touch key technical field. The capacitive touch key circuit comprises a first touch pad, a second touch pad, a first switch module, a capacitive touch chip and an application processor; the first touch pad and the second touch pad are arranged adjacently, are respectively and electrically connected with the first switch module and are used for receiving touch operation of a user; the first switch module is also electrically connected with the capacitive touch chip and the application processor respectively, and is used for controlling the first touch pad to be electrically connected with the capacitive touch chip, or controlling the second touch pad to be electrically connected with the capacitive touch chip, or controlling the first touch pad and the second touch pad to be electrically connected with the capacitive touch chip under the control of the application processor; the capacitive touch chip is also electrically connected with the application processor and used for outputting the received capacitive touch signal to the application processor. The touch position and the size of the touch area of the capacitive touch key can be flexibly adjusted.

Description

Capacitance touch key circuit and mobile terminal

Technical Field

The utility model relates to an electric capacity touch key technical field, concretely relates to electric capacity touch key circuit and mobile terminal.

Background

Along with the development of science and technology, the functions of the mobile terminal are increasingly rich, and the diversified requirements of people are met. Taking a mobile phone as an example, at present, many mobile phones have keys, namely shoulder keys, designed on the side of the middle frame of the mobile phone, so as to improve the interactive input experience during the game operation process and improve the game operation effect. Among many implementation modes of the shoulder key, the capacitive touch key is widely applied due to the advantages of high sensitivity, high response speed and the like.

In the current shoulder key scheme, shoulder keys are generally arranged on a middle frame of the mobile terminal, and taking the arrangement of one shoulder key on each of the left side and the right side of the middle frame as an example, the two shoulder keys are generally arranged at positions convenient for a user to operate with the left hand and the right hand when the mobile terminal is in a cross-screen state. However, because the size of the palm of the user and the length of the finger are different, the capacitive touch shoulder key with a fixed touch position and touch area cannot meet the requirements of different users.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a capacitance touch key circuit and a mobile terminal, so as to solve the technical problem that the adaptability of the current capacitance touch key circuit to the size of the palm of the user and the length of the finger is not strong.

The utility model provides an above-mentioned technical problem adopted technical scheme as follows:

according to an aspect of an embodiment of the present invention, there is provided a capacitive touch key circuit, including a first touch pad, a second touch pad, a first switch module, a capacitive touch chip, and an application processor;

the first touch pad and the second touch pad are arranged adjacently, are respectively electrically connected with the first switch module and are used for receiving touch operation of a user;

the first switch module is also electrically connected with the capacitive touch chip and the application processor respectively, and is used for controlling the first touch pad to be electrically connected with the capacitive touch chip, or controlling the second touch pad to be electrically connected with the capacitive touch chip, or controlling the first touch pad and the second touch pad to be electrically connected with the capacitive touch chip under the control of the application processor;

the capacitive touch chip is also electrically connected with the application processor and used for outputting the received capacitive touch signal to the application processor.

Optionally, the capacitive touch key circuit further includes a first shielding plate corresponding to the first touch pad and a second shielding plate corresponding to the second touch pad, and the first shielding plate and the second shielding plate are electrically connected to the first switch module respectively.

Optionally, the first switch module includes a first switch chip, the first touch pad and the first shield pad are electrically connected to the first signal input terminal and the second signal input terminal of the first switch chip, the second touch pad and the second shield pad are electrically connected to the third signal input terminal and the fourth signal input terminal of the first switch chip, respectively, the first signal output terminal of the first switch chip is electrically connected to the third signal output terminal thereof and the first touch signal input terminal of the capacitive touch chip, respectively, the second signal output terminal of the first switch chip is electrically connected to the fourth signal output terminal thereof and the first shield signal input terminal of the capacitive touch chip, respectively, the first enable terminal and the second enable terminal of the first switch chip are electrically connected to the first touch control terminal and the second touch control terminal of the application processor, respectively, and the first signal output terminal to the fourth signal output terminal of the first switch chip correspond to the first signal input terminal to the fourth signal input terminal thereof, respectively.

Optionally, the first switching module comprises a switching unit built up from discrete switching elements.

Optionally, the capacitive touch key circuit further includes a third touch pad, a fourth touch pad, and a second switch module;

the third touch pad and the fourth touch pad are arranged adjacently, are respectively and electrically connected with the second switch module, and are used for receiving touch operation of a user;

the second switch module is further electrically connected with the capacitive touch chip and the application processor respectively, and is used for controlling the third touch pad to be electrically connected with the capacitive touch chip, or controlling the fourth touch pad to be electrically connected with the capacitive touch chip, or controlling the third touch pad and the fourth touch pad to be electrically connected with the capacitive touch chip under the control of the application processor.

Optionally, the capacitive touch key circuit further includes a third shielding plate corresponding to the third touch pad and a fourth shielding plate corresponding to the fourth touch pad, and the third shielding plate and the fourth shielding plate are electrically connected to the second switch module, respectively.

Optionally, the second switch module includes a second switch chip, the third touch pad and the third shielding plate are electrically connected to the first signal input end and the second signal input end of the second switch chip, the fourth touch pad and the fourth shielding plate are electrically connected to the third signal input end and the fourth signal input end of the second switch chip, the first signal output end of the second switch chip is electrically connected to the third signal output end and the second touch signal input end of the capacitive touch chip, the second signal output end of the second switch chip is electrically connected to the fourth signal output end and the second shielding signal input end of the capacitive touch chip, the first enable end and the second enable end of the second switch chip are electrically connected to the third touch control end and the fourth touch control end of the application processor, and the first signal output end to the fourth signal output end of the second switch chip correspond to the first signal input end to the fourth signal input end of the second switch chip.

Optionally, the second switching module comprises a switching unit built up from discrete switching elements.

Optionally, the discrete switching element includes an NPN transistor, a PNP transistor, an N-channel MOS transistor, and/or a P-channel MOS transistor.

According to the utility model discloses another aspect of the embodiment provides a mobile terminal, and this mobile terminal includes above-mentioned electric capacity touch key circuit.

The embodiment of the utility model provides a including first touch pad, second touch pad, first switch module, electric capacity touch chip and application processor in electric capacity touch key circuit and the mobile terminal that provide; the first touch pad and the second touch pad are arranged adjacently, are respectively and electrically connected with the first switch module, and are used for receiving touch operation of a user; the first switch module is also electrically connected with the capacitive touch chip and the application processor respectively, and is used for controlling the first touch pad to be electrically connected with the capacitive touch chip, or controlling the second touch pad to be electrically connected with the capacitive touch chip, or controlling the first touch pad and the second touch pad to be electrically connected with the capacitive touch chip under the control of the application processor; the capacitive touch chip is also electrically connected with the application processor and used for outputting the received capacitive touch signal to the application processor. Through this electric capacity touch key circuit, the size of the touch-control position and the touch-control area of adjustment electric capacity touch key that can be nimble, the user can set up different touch-control positions and touch-control areas of electric capacity touch key according to own palm size and finger length ground to electric capacity touch key's adaptability has been promoted.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic diagram of a hardware structure of a mobile terminal according to the present invention;

fig. 2 is a schematic diagram of a capacitive touch key circuit according to an embodiment of the present invention;

fig. 3 is a schematic circuit connection diagram of a capacitive touch key circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of another capacitive touch key circuit provided in an embodiment of the present invention.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the following description, suffixes such as "module", "part", or "unit" used to denote elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

The terminal may be implemented in various forms. For example, the terminal described in the present invention may include mobile terminals such as a mobile phone, a tablet computer, a notebook computer, a palm top computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and fixed terminals such as a Digital TV, a desktop computer, and the like.

The following description will be given by way of example of a mobile terminal, and it will be understood by those skilled in the art that the construction according to the embodiments of the present invention can be applied to a fixed type terminal, in addition to elements particularly used for mobile purposes.

Referring to fig. 1, which is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention, the mobile terminal 100 may include: RF (Radio Frequency) unit 101, wiFi module 102, audio output unit 103, a/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 1 is not intended to be limiting of mobile terminals, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The following describes each component of the mobile terminal in detail with reference to fig. 1:

the radio frequency unit 101 may be configured to receive and transmit signals during information transmission and reception or during a call, and specifically, receive downlink information of a base station and then process the downlink information to the processor 110; in addition, the uplink data is transmitted to the base station. Typically, radio frequency unit 101 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 101 can also communicate with a network and other devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000 ), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division multiplexing-Long Term Evolution), and TDD-LTE (Time Division multiplexing-Long Term Evolution), etc.

WiFi belongs to short-distance wireless transmission technology, and the mobile terminal can help a user to receive and send e-mails, browse webpages, access streaming media and the like through the WiFi module 102, and provides wireless broadband internet access for the user. Although fig. 1 shows the WiFi module 102, it is understood that it does not belong to the essential constitution of the mobile terminal, and may be omitted entirely as needed within the scope not changing the essence of the utility model.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output as sound when the mobile terminal 100 is in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, and the like.

The a/V input unit 104 is used to receive audio or video signals. The a/V input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, the Graphics processor 1041 Processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 may receive sounds (audio data) via the microphone 1042 in a phone call mode, a recording mode, a voice recognition mode, or the like, and may be capable of processing such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.

The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the mobile terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the gesture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 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 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, may collect a touch operation performed by a user on or near the touch panel 1071 (e.g., an operation performed by the user on or near the touch panel 1071 using a finger, a stylus, or any other suitable object or accessory), and drive a corresponding connection device according to a predetermined program. The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and can receive and execute commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. In particular, other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like, and are not limited to these specific examples.

Further, the touch panel 1071 may cover the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although the touch panel 1071 and the display panel 1061 are shown in fig. 1 as two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the mobile terminal, and is not limited herein.

The interface unit 108 serves as an interface through which at least one external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and external devices.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 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 110 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The mobile terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system.

Although not shown in fig. 1, the mobile terminal 100 may further include a bluetooth module or the like, which is not described in detail herein.

Based on above-mentioned mobile terminal hardware structure, provide the utility model discloses each embodiment.

Example one

In order to solve the not strong technical problem of adaptability of current electric capacity touch key circuit to user's palm size and finger length, this embodiment provides an electric capacity touch key circuit, please refer to fig. 2, fig. 2 is the utility model provides a electric capacity touch key circuit schematic diagram. The capacitive touch key circuit comprises a first touch pad T11, a second touch pad T21, a first switch module S1, a capacitive touch chip D3 and an application processor D4;

the first touch pad T11 and the second touch pad T21 are adjacently arranged, are electrically connected with the first switch module S1, and are used for receiving touch operation of a user;

the first switch module S1 is further electrically connected to the capacitive touch chip D3 and the application processor D4, respectively, and is configured to control the first touch pad T11 to be electrically connected to the capacitive touch chip D3, or control the second touch pad T21 to be electrically connected to the capacitive touch chip D3, or control both the first touch pad T11 and the second touch pad T21 to be electrically connected to the capacitive touch chip D3 under the control of the application processor D4;

the capacitive touch chip D3 is further electrically connected to the application processor D4, and is configured to output the received capacitive touch signal to the application processor D4.

In this embodiment, it should be noted that the capacitive touch key circuit of this embodiment is suitable for mobile terminals such as mobile phones, tablet computers, and game machines, which are provided with capacitive touch keys.

Specifically, the capacitive touch key circuit is a self-capacitance type capacitive touch key circuit. The first switch module S1 can control the first touch pad T11 to be electrically connected to the capacitive touch chip D3, or control the second touch pad T21 to be electrically connected to the capacitive touch chip D3, or control both the first touch pad T11 and the second touch pad T21 to be electrically connected to the capacitive touch chip D3 under the control of the application processor D4, please refer to fig. 2, the first touch pad T11 and the second touch pad T21 are connected to each other after passing through the first switch module S1, and then are electrically connected to the capacitive touch chip D3, that is, the first touch pad T11 and the second touch pad T21 are electrically connected to the same signal input pin of the capacitive touch chip D3 after passing through the first switch module S1. Because the first touch pad T11 and the second touch pad T21 are disposed adjacent to each other, when the first touch pad T11 and the second touch pad T21 are both electrically connected to the capacitive touch chip D3, the touch areas corresponding to the first touch pad T11 and the second touch pad T21 can be combined together, so as to effectively increase the touch area of the capacitive touch key, thereby flexibly adjusting the touch position and the touch area of the capacitive touch key under the action of the first switch module S1, and a user can flexibly set different touch positions and touch areas of the capacitive touch key according to the palm size and the finger length of the user, thereby improving the adaptability of the capacitive touch key. For example, when the capacitive touch key circuit of the present embodiment is applied to a side shoulder key of a mobile phone, a user may select to use the first touch pad T11 or the second touch pad T21 of the side shoulder key or combine the first touch pad T11 and the second touch pad T21 together according to his/her preference.

Optionally, the capacitive touch chip D3 and the application processor D4 are electrically connected through an IIC bus.

In an embodiment, the capacitive touch key circuit further includes a first shielding plate T12 corresponding to the first touch pad T11 and a second shielding plate T22 corresponding to the second touch pad T21, and the first shielding plate T12 and the second shielding plate T22 are electrically connected to the first switch module S1, respectively.

In this embodiment, the first touch pad T11 and the second touch pad T21 are respectively configured to receive a touch operation of a user and generate a corresponding touch signal, and the first shielding pad T12 and the second shielding pad T22 are configured to shield an interference signal to the corresponding touch signal.

Optionally, the first touch pad T11, the first shielding plate T12, the second touch pad T21 and the second shielding plate T22 are all disposed on an FPC (Flexible Printed Circuit), wherein the first touch pad T11 and the second touch pad T21 are disposed on an FPC wiring layer near a touch surface of the capacitive touch key, and the first shielding plate T12 and the second shielding plate T22 are respectively disposed at corresponding positions of a wiring layer adjacent to the corresponding touch pad wiring layer, thereby simplifying a mounting process of the capacitive touch key.

Further optionally, the first touch pad T11, the first shielding plate T12, the second touch pad T21 and the second shielding plate T22 are all disposed on the same FPC, so as to further simplify the installation process of the capacitive touch key.

In an embodiment, please refer to fig. 3, fig. 3 is a schematic circuit connection diagram of a capacitive touch key circuit according to an embodiment of the present invention, in which a first touch pad T11 and a second touch pad T21 respectively correspond to a first left shoulder key and a second left shoulder key of a mobile phone as an example. The first switch module S1 includes a first switch chip D1, the first touch pad T11 and the first shielding plate T12 are respectively electrically connected to a first signal input terminal INA11 and a second signal input terminal INA12 of the first switch chip D1, and the first touch signal touch _ sensor _ l1 and the first shielding signal touch _ shield _ l1 are respectively output to the first signal input terminal INA11 and the second signal input terminal INA12 of the first switch chip D1; the second touch pad T21 and the second shielding pad T22 are electrically connected to the third signal input terminal INB11 and the fourth signal input terminal INB12 of the first switch chip D1, respectively, and output the second touch signal touch _ sensor _ l2 and the first shielding signal touch _ shield _ l2 to the third signal input terminal INB11 and the fourth signal input terminal INB12 of the first switch chip D1, respectively; the first signal output end OUTA11 of the first switch chip D1 is electrically connected to the third signal output end OUTB11 thereof and the first touch signal input end touch _ sensor _ l of the capacitive touch chip D3, the second signal output end OUTA12 of the first switch chip D1 is electrically connected to the fourth signal output end OUTB12 thereof and the first shielding signal input end touch _ shield _ l of the capacitive touch chip D3, the first enable end ENA1 and the second enable end ENB1 of the first switch chip D1 are electrically connected to the first touch control end touch1_ ENA and the second touch control end touch1_ ENB of the application processor D4, respectively, and the first signal output end OUTA11 to the fourth signal output end OUTB12 of the first switch chip D1 correspond to the first signal input end INA11 to the fourth signal input end INB12 thereof, respectively.

In this embodiment, the first switch module S1 may be, but is not limited to, an integrated circuit switch scheme, which is adopted by the first switch chip D1, that is, the first switch module S1. The first signal output terminal OUTA11, the second signal output terminal OUTA12, the third signal output terminal OUTB11, and the fourth signal output terminal OUTB12 of the first switch chip D1 correspond to the first signal input terminal INA11, the second signal input terminal INA12, the third signal input terminal INB11, and the fourth signal input terminal INB12 thereof, respectively. The first touch pad T11 and the second touch pad T21 are electrically connected to the first touch signal input terminal touch _ sensor _ l of the capacitive touch chip D3 through the first switch chip D1, respectively, and the first shielding plate T12 and the second shielding plate T22 are electrically connected to the first shielding signal input terminal touch _ shield _ l of the capacitive touch chip D3 through the first switch chip D1, respectively. Under the control of the first touch control terminal touch1_ ena and the second touch control terminal touch1_ enb of the application processor D4, the first switch chip D1 controls the first touch pad T11 to be electrically connected to the first touch signal input terminal touch _ sensor _ l of the capacitive touch chip D3, the first shielding pad T12 to be electrically connected to the first shielding signal input terminal touch _ shield _ l of the capacitive touch chip D3, or controls the second touch pad T21 to be electrically connected to the first touch signal input terminal touch _ sensor _ l of the capacitive touch chip D3, the second shielding pad T22 to be electrically connected to the first shielding signal input terminal touch _ shield _ l of the capacitive touch chip D3, or controls the first touch pad T11 and the second touch pad T21 to be electrically connected to the first touch signal input terminal touch _ sensor _ l of the capacitive touch chip D3, and controls the first shielding pad T12 and the second shielding pad T22 to be electrically connected to the first touch signal input terminal touch signal _ sensor _ input terminal touch _ shield _ sensor _ l of the capacitive touch chip D3. Therefore, under the action of the first switch module S1, the touch position and the touch area of the capacitive touch key can be flexibly adjusted, and the adaptability of the capacitive touch key is improved.

For example, a switch logic table of the first switch chip D1 under the control of the first touch control terminal touch1_ ena and the second touch control terminal touch1_ enb of the application processor D4 is shown in table 1:

TABLE 1

When the first touch control terminal touch1_ ena and the second touch control terminal touch1_ enb are both at a low level, the first touch pad T11 to the first touch signal input terminal touch _ sensor _ l, the first shielding pad T12 to the first shielding signal input terminal touch _ shield _ l, the second touch pad T21 to the first touch signal input terminal touch _ sensor _ l, and the second shielding pad T22 to the first shielding signal input terminal touch _ shield _ l are all turned on; when the first touch control terminal touch1_ ena is at a high level and the second touch control terminal touch1_ enb is at a low level, the first touch panel T11 to the first touch signal input terminal touch _ sensor _ l and the first shielding panel T12 to the first shielding signal input terminal touch _ shield _ l are both turned off, and the second touch panel T21 to the first touch signal input terminal touch _ sensor _ l and the second shielding panel T22 to the first shielding signal input terminal touch _ shield _ l are both turned on; when the first touch control terminal touch1_ ena is at a low level and the second touch control terminal touch1_ enb is at a high level, the first touch panel T11 to the first touch signal input terminal touch _ sensor _ l and the first shielding panel T12 to the first shielding signal input terminal touch _ shield _ l are both turned on, and the second touch panel T21 to the first touch signal input terminal touch _ sensor _ l and the second shielding panel T22 to the first shielding signal input terminal touch _ shield _ l are both turned off; when the first touch control terminal touch1_ ena and the second touch control terminal touch1_ enb are both at a high level, the first touch pad T11 to the first touch signal input terminal touch _ sensor _ l, the first shielding pad T12 to the first shielding signal input terminal touch _ shield _ l, the second touch pad T21 to the first touch signal input terminal touch _ sensor _ l, and the second shielding pad T22 to the first shielding signal input terminal touch _ shield _ l are all disconnected.

In one embodiment, the first switching module S1 comprises a switching unit built up from discrete switching elements.

In the present embodiment, each switching channel of the first switching module S1 is composed of a switching unit constructed by discrete switching elements.

In one embodiment, please refer to fig. 4, fig. 4 is a schematic diagram of another capacitive touch key circuit according to an embodiment of the present invention. The capacitive touch key circuit further comprises a third touch pad T31, a fourth touch pad T41 and a second switch module S2; the third touch pad T31 and the fourth touch pad T41 are disposed adjacent to each other, and are respectively electrically connected to the second switch module S2, and are configured to receive a touch operation of a user; the second switch module S2 is further electrically connected to the capacitive touch chip D3 and the application processor D4, and is configured to control the third touch pad T31 to be electrically connected to the capacitive touch chip D3, or control the fourth touch pad T41 to be electrically connected to the capacitive touch chip D3, or control both the third touch pad T31 and the fourth touch pad T41 to be electrically connected to the capacitive touch chip D3 under the control of the application processor D4.

In this embodiment, the second switch module S2 can control the third touch pad T31 to be electrically connected to the capacitive touch chip D3, or control the fourth touch pad T41 to be electrically connected to the capacitive touch chip D3, or control both the third touch pad T31 and the fourth touch pad T41 to be electrically connected to the capacitive touch chip D3 under the control of the application processor D4, please refer to fig. 4, the third touch pad T31 and the fourth touch pad T41 are connected to each other after passing through the second switch module S2, and then are electrically connected to the capacitive touch chip D3, that is, the third touch pad T31 and the fourth touch pad T41 are electrically connected to the same signal input pin of the capacitive touch chip D3 after passing through the second switch module S2. Because the third touch pad T31 and the fourth touch pad T41 are disposed adjacent to each other, when the third touch pad T31 and the fourth touch pad T41 are both electrically connected to the capacitive touch chip D3, the touch areas corresponding to the third touch pad T31 and the fourth touch pad T41 can be combined together, so as to effectively increase the touch area of the capacitive touch key, and thus, under the action of the second switch module S2, the touch position and the touch area of the capacitive touch key can be flexibly adjusted, and a user can flexibly set different touch positions and touch areas of the capacitive touch key according to the size of the palm and the length of the finger of the user, thereby improving the adaptability of the capacitive touch key. Through the arrangement of the third touch pad T31, the fourth touch pad T41 and the second switch module S2, two sets of capacitive touch keys capable of adjusting touch positions and touch areas are realized, so that the capacitive touch key circuit of the embodiment can be applied to application scenarios requiring flexible adjustment of touch positions and touch areas of the two sets of capacitive touch keys, for example, mobile terminals with left and right shoulder keys respectively.

In an embodiment, the capacitive touch key circuit further includes a third shielding plate T32 corresponding to the third touch pad T31 and a fourth shielding plate T42 corresponding to the fourth touch pad T41, and the third shielding plate T32 and the fourth shielding plate T42 are electrically connected to the second switch module S2, respectively.

In this embodiment, the third touch pad T31 and the fourth touch pad T41 are respectively configured to receive a touch operation of a user and generate a corresponding touch signal, and the third shielding pad T32 and the fourth shielding pad T42 are configured to shield an interference signal to the corresponding touch signal.

Optionally, the third touch pad T31, the third shielding plate T32, the fourth touch pad T41 and the fourth shielding plate T42 are all disposed on the FPC, wherein the third touch pad T31 and the fourth touch pad T41 are disposed on a wiring layer of the FPC near the surface of the capacitive touch key, and the third shielding plate T32 and the fourth shielding plate T42 are respectively disposed at corresponding positions of a wiring layer adjacent to the corresponding wiring layer of the touch pad, so as to simplify the installation process of the capacitive touch key.

Further optionally, the third touch pad T31, the third shielding plate T32, the fourth touch pad T41 and the fourth shielding plate T42 are all disposed on the same FPC, so as to further simplify the installation process of the capacitive touch key.

In one embodiment, please refer to fig. 3, wherein a third touch pad T31 and a fourth touch pad T41 respectively correspond to a first right shoulder key and a second right shoulder key of a mobile phone. The second switch module S2 includes a second switch chip D2, the third touch pad T31 and the third shielding pad T32 are respectively electrically connected to the first signal input end INA21 and the second signal input end INA22 of the second switch chip D2, and respectively output a third touch signal touch _ sensor _ r1 and a third shielding signal touch _ shield _ r1 to the first signal input end INA21 and the second signal input end INA22 of the second switch chip D2; the fourth touch pad T41 and the fourth shielding pad T42 are electrically connected to the third signal input terminal INB21 and the fourth signal input terminal INB22 of the second switch chip D2, respectively, and output a fourth touch signal touch _ sensor _ r2 and a second shielding signal touch _ shield _ r2 to the second signal input terminal INB21 and the second signal input terminal INB22 of the second switch chip D2, respectively; the first signal output end OUTA21 of the second switch chip D2 is electrically connected to the third signal output end OUTB21 of the second switch chip D2 and the second touch signal input end touch _ sensor _ r of the capacitive touch chip D3, the second signal output end OUTA22 of the second switch chip D2 is electrically connected to the fourth signal output end OUTB22 of the second switch chip D2 and the second shielding signal input end touch _ shield _ r of the capacitive touch chip D3, the first enable end ENA2 and the second enable end ENB2 of the second switch chip D2 are electrically connected to the third touch control end touch2_ ENA and the fourth touch control end touch2_ ENB of the application processor D4, respectively, and the first signal output end OUTA21 to the fourth signal output end OUTB22 of the second switch chip D2 correspond to the first signal input end INA21 to the fourth signal input end INB22 of the second switch chip D2, respectively.

In this embodiment, the second switch module S2 may be, but is not limited to, an integrated circuit switch scheme, which is adopted by the second switch chip D2, that is, the second switch module S2. The first, second, third and fourth signal output terminals OUTA21, OUTA22, OUTB21 and OUTB22 of the second switch chip D2 correspond to the first, second, third and fourth signal input terminals INA21, INA22, INB21 and INB22 thereof, respectively. The third touch pad T31 and the fourth touch pad T41 are electrically connected to the second touch signal input terminal touch _ sensor _ r of the capacitive touch chip D3 through the second switch chip D2, respectively, and the third shielding plate T32 and the fourth shielding plate T42 are electrically connected to the second shielding signal input terminal touch _ shield _ r of the capacitive touch chip D3 through the second switch chip D2, respectively. Under the control of the third touch control terminal touch2_ ena and the fourth touch control terminal touch2_ enb of the application processor D4, the second switch chip D2 controls the third touch pad T31 to be electrically connected to the second touch signal input terminal touch _ sensor _ r of the capacitive touch chip D3, the third shielding pad T32 to be electrically connected to the second shielding signal input terminal touch _ shield _ r of the capacitive touch chip D3, or controls the fourth touch pad T41 to be electrically connected to the second touch signal input terminal touch _ sensor _ r of the capacitive touch chip D3, the fourth shielding pad T42 to be electrically connected to the second shielding signal input terminal touch _ shield _ r of the capacitive touch chip D3, or controls the third touch pad T31 and the fourth touch pad T41 to be electrically connected to the second touch signal input terminal touch _ sensor _ r of the capacitive touch chip D3, and controls the third shielding pad T32 and the fourth shielding pad T42 to be electrically connected to the second touch signal input terminal touch signal _ shield _ sensor _ r of the capacitive touch chip D3. Therefore, under the action of the second switch module S2, the touch position and the touch area of the capacitive touch key can be flexibly adjusted, and the adaptability of the capacitive touch key is improved. The switching logic of the second switch chip D2 under the control of the third touch control terminal touch2_ ena and the fourth touch control terminal touch2_ enb of the application processor D4 is the same as the switching logic of the first switch chip D1 under the control of the first touch control terminal touch1_ ena and the second touch control terminal touch1_ enb of the application processor D4, which is not described herein again.

In one embodiment, the second switching module S2 comprises a switching unit built up from discrete switching elements.

In the present embodiment, each switching channel of the second switching module S2 is composed of a switching unit constructed by discrete switching elements.

The capacitive touch key circuit in the embodiment includes a first touch pad T11, a second touch pad T21, a first switch module S1, a capacitive touch chip D3, and an application processor D4; the first touch pad T11 and the second touch pad T21 are adjacently arranged, and are respectively electrically connected with the first switch module S1, and are used for receiving touch operation of a user; the first switch module S1 is further electrically connected to the capacitive touch chip D3 and the application processor D4, respectively, and is configured to control the first touch pad T11 to be electrically connected to the capacitive touch chip D3, or control the second touch pad T21 to be electrically connected to the capacitive touch chip D3, or control both the first touch pad T11 and the second touch pad T21 to be electrically connected to the capacitive touch chip D3 under the control of the application processor D4; the capacitive touch chip D3 is further electrically connected to the application processor D4, and is configured to output the received capacitive touch signal to the application processor D4. Through this electric capacity touch key circuit, the size of the touch-control position and the touch-control area of adjustment electric capacity touch key that can be nimble, the user can set up different touch-control positions and touch-control areas of electric capacity touch key according to own palm size and finger length ground to electric capacity touch key's adaptability has been promoted.

Example two

The present embodiment provides a mobile terminal, which includes the capacitive touch key circuit in the first embodiment. The mobile terminal of this embodiment, the size of the touch position and the touch area of adjustment electric capacity touch key that can be nimble, the user can set up different touch positions and the touch area of electric capacity touch key according to own palm size and finger length ground in a flexible way to electric capacity touch key's adaptability has been promoted. The specific structure of the capacitive touch key circuit is as described in the above embodiment, and is not described herein again.

The corresponding technical features in the above embodiments may be used with each other without causing contradiction in the schemes or without being implementable.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A capacitive touch key circuit is characterized by comprising a first touch pad, a second touch pad, a first switch module, a capacitive touch chip and an application processor;

the first touch pad and the second touch pad are arranged adjacently, are respectively and electrically connected with the first switch module, and are used for receiving touch operation of a user;

2. The capacitive touch key circuit according to claim 1, further comprising a first shielding plate corresponding to the first touch pad and a second shielding plate corresponding to the second touch pad, wherein the first shielding plate and the second shielding plate are electrically connected to the first switch module, respectively.

3. The capacitive touch key circuit according to claim 2, wherein the first switch module includes a first switch chip, the first touch pad and the first shield pad are electrically connected to the first signal input terminal and the second signal input terminal of the first switch chip, the second touch pad and the second shield pad are electrically connected to the third signal input terminal and the fourth signal input terminal of the first switch chip, the first signal output terminal of the first switch chip is electrically connected to the third signal output terminal and the first touch signal input terminal of the capacitive touch chip, the second signal output terminal of the first switch chip is electrically connected to the fourth signal output terminal and the first shield signal input terminal of the capacitive touch chip, the first enable terminal and the second enable terminal of the first switch chip are electrically connected to the first touch control terminal and the second touch control terminal of the application processor, and the first signal output terminal to the fourth signal output terminal of the first switch chip correspond to the first signal input terminal and the fourth signal input terminal of the first switch chip.

4. The capacitive touch key circuit of claim 1, wherein the first switch module comprises a switch unit constructed from discrete switch elements.

5. The capacitive touch key circuit according to any one of claims 1-4, further comprising a third touch pad, a fourth touch pad, and a second switch module;

6. The capacitive touch key circuit according to claim 5, further comprising a third shielding plate corresponding to the third touch pad and a fourth shielding plate corresponding to the fourth touch pad, wherein the third shielding plate and the fourth shielding plate are electrically connected to the second switch module, respectively.

7. The capacitive touch key circuit according to claim 6, wherein the second switch module includes a second switch chip, the third touch pad and the third shield pad are electrically connected to the first signal input terminal and the second signal input terminal of the second switch chip, the fourth touch pad and the fourth shield pad are electrically connected to the third signal input terminal and the fourth signal input terminal of the second switch chip, the first signal output terminal of the second switch chip is electrically connected to the third signal output terminal and the second touch signal input terminal of the capacitive touch chip, the second signal output terminal of the second switch chip is electrically connected to the fourth signal output terminal and the second shield signal input terminal of the capacitive touch chip, the first enable terminal and the second enable terminal of the second switch chip are electrically connected to the third touch control terminal and the fourth touch control terminal of the application processor, and the first signal output terminal to the fourth signal output terminal of the second switch chip correspond to the first signal input terminal to the fourth signal input terminal of the application processor, respectively.

8. The capacitive touch key circuit of claim 5, wherein the second switch module comprises a switch unit constructed from discrete switch elements.

9. The capacitive touch key circuit according to claim 4 or 8, wherein the discrete switching elements comprise NPN type triodes, PNP type triodes, N-channel MOS transistors and/or P-channel MOS transistors.

10. A mobile terminal, characterized in that the mobile terminal comprises a capacitive touch key circuit according to any one of claims 1-9.