CN117395331B - Folding screen device, angle detection method, and storage medium - Google Patents

Abstract

The present application provides a folding screen device, an angle detection method and a storage medium. The TP lines on both sides of the bending area of the display touch screen in the folding screen device are interconnected by using a switch device to form the two poles of the capacitive sensor, and different level signals are sent through the IC chip to control the switch device to be turned on or off, and when the switch device is turned on, a pulse signal is sent to make the capacitive sensor formed by the TP line interconnection generate a changing charge, so that the angle detection circuit can determine the corresponding capacitance value according to the charge, and then realize the detection of the folding angle of the display touch screen according to the size of the capacitance value, without the need for dual A+G devices, which not only reduces the implementation cost, but also facilitates the layout of the mainboard of the folding screen device.

Description

Folding screen device, angle detection method and storage medium

Technical Field

The present application relates to the field of display technology, and in particular to a folding screen device, an angle detection method and a storage medium.

Background Art

With the development of screen technology, the display touch screens of foldable screen devices (which can display content and can be operated by touch) are becoming larger and larger. In order to facilitate user use and carrying, foldable screen devices with foldable screens have been favored by users. Take foldable screen mobile phones as an example. They usually have an inner screen and an outer screen. When the inner screen of a foldable screen mobile phone is closed to a certain angle, the inner screen needs to be turned off and switched to the outer screen, which requires accurate detection of the closing angle of the inner screen.

At present, in order to realize the above functions, a device (A+G device) integrating the functions of accelerometer (A) and gyroscope (G) is arranged on the mobile phone motherboard in the screen areas corresponding to both sides of the folding axis (bending area), that is, a dual A+G device is used, and the closing angle of the inner screen is determined by the data sensed by the A+G devices in the screen areas on both sides of the folding axis.

However, this dual A+G device solution has a high implementation cost and is not conducive to the layout of the mobile phone motherboard. At the same time, since the two devices work together to produce the angle detection result, when one device fails, the angle detection will fail, affecting the stability of the mobile phone's angle detection.

Summary of the invention

In order to solve the above technical problems, the present application provides a folding screen device, an angle detection method and a storage medium, so that the folding angle of the display touch screen can be detected without the aid of dual A+G devices, which can not only reduce the implementation cost, but also facilitate the layout of the motherboard of the folding screen device.

In the first aspect, the present application provides a folding screen device. The folding screen device includes: a display touch screen, a switch device, an integrated circuit IC chip and an angle detection circuit, the display touch screen includes a bending area, and a display touch area located outside the bending area; the TP lines of the display touch area near the bending area are interconnected through the switch device to form a capacitive sensor, and the capacitive sensor includes an emitter and a receiver located on both sides of the bending area respectively; the switch device is connected to the IC chip through a control signal line, and is used to be turned on according to a first level signal sent by the IC chip; after the switch device of the capacitive sensor is turned on according to the first level signal and the IC chip sends a pulse signal, the emitter generates a pulse signal, the potential of the receiver remains unchanged, and a changing charge is generated; the angle detection circuit is used to obtain the charge generated by the capacitive sensor, and determine the capacitance value of the capacitive sensor according to the charge; the IC chip is used to determine the folding angle of the display touch screen according to the capacitance value.

The capacitive sensor formed by the TP lines in the display touch area near the bending area through the switch device interconnection is, for example, C1 hereinafter, the emitter is, for example, TxC hereinafter, and the receiver is, for example, RxC hereinafter.

It is understandable that in actual applications, the folding screen device may also include a foldable middle frame (such as the middle frame 10d mentioned below), a back shell (such as the back shell 10c mentioned below), an outer screen (such as the outer screen 10a mentioned below), etc., which are not listed one by one here, and this application does not impose any restrictions on this.

It is understandable that in practical applications, the IC chip is also used to send the second level signal.

Correspondingly, the switch device is also used to be turned off according to the second level signal.

Exemplarily, in some implementations, for a switch device operating (turned on) at a high level, the first level signal is a high level signal.

Correspondingly, the second level signal is a low level signal.

Exemplarily, in some other implementations, for a switch device operating (turned on) at a low level, the first level signal is a low level signal.

Correspondingly, the second level signal is a high level signal.

In addition, it is understandable that through experiments, it is found that the capacitance value generated by the capacitance sensor formed by the TP wiring interconnection has the characteristic of changing with the change of the folding angle, and the capacitance value is usually inversely proportional to the folding angle. Therefore, before performing angle detection on the folding screen device of the above structure, the relationship between different capacitance values and different folding angles can be determined based on the characteristic that the capacitance value changes with the change of the folding angle, and then the mapping relationship of the folding angle corresponding to different capacitance values is obtained, so that the folding angle of the display touch screen can be obtained according to the determined capacitance value and the predetermined mapping relationship.

In this way, the TP lines on both sides of the bending area of the display touch screen in the folding screen device are interconnected by using switching devices to form the two poles of the capacitive sensor. Different level signals are sent through the IC chip to control the conduction or interruption of the switching device, and when the switching device is turned on, a pulse signal is sent to make the capacitive sensor formed by the interconnection of the TP lines generate a changing charge. In this way, the angle detection circuit can determine the corresponding capacitance value according to the charge, and then realize the detection of the folding angle of the display touch screen according to the size of the capacitance value. There is no need to rely on dual A+G devices, which not only reduces the implementation cost, but also is beneficial to the motherboard layout of the folding screen device.

According to the first aspect, the switching device includes a thin film field effect transistor TFT; wherein, in a partial or entire area of the TP lines in the display touch area near the bending area, every two adjacent TP lines are interconnected by a TFT, and the gates of all TFTs are connected to the same control signal line.

For example, in practical applications, the switch device may also be a metal oxide semiconductor field effect transistor. The specific switch device may be selected according to business needs, and this application does not limit this.

According to the first aspect, or any implementation of the first aspect above, the display touch screen is a mutual capacitance display touch screen; the mutual capacitance display touch screen includes a first TP line and a second TP line, the first TP line is parallel to a folding axis set in the bending area, and the second TP line is perpendicular to the folding axis; wherein, in a partial or entire area of the first TP line near the bending area of the display touch area, every two adjacent first TP lines are interconnected through a TFT, and the gates of all TFTs are connected to the same control signal line.

The first TP routing is, for example, an Rx routing mentioned below, and the second TP routing is, for example, a Tx routing mentioned below.

Since the TP lines parallel to the folding axis set at the bending area are generally close to the bending area, the TP lines parallel to the folding axis set at the bending area are selected for interconnection to form the two poles of the capacitive sensor to ensure the sensitivity of capacitance value detection, and staying away from the edge of the screen can reduce false touches, thereby ensuring accuracy.

According to the first aspect, or any implementation of the first aspect above, the display touch screen is a self-capacitive display touch screen; the self-capacitive display screen includes a first TP line, and the first TP line is parallel to a folding axis set in the bending area; wherein, in a partial or entire area of the first TP line of the display touch area close to the bending area, every two adjacent first TP lines are interconnected through a TFT, and the gates of all TFTs are connected to the same control signal line.

The first TP routing is, for example, the P1 to P8 routing mentioned below.

According to the first aspect, or any implementation of the first aspect above, the angle detection circuit includes a charge amplifier, a filter, a variable gain amplifier and an analog/digital converter; the reverse input terminal of the charge amplifier is connected to the receiving electrode, and the positive input terminal of the charge amplifier is grounded; the input terminal of the filter is connected to the output terminal of the charge amplifier; the input terminal of the variable gain amplifier is connected to the output terminal of the filter; the input terminal of the analog/digital converter is connected to the output terminal of the variable gain amplifier, and the output terminal of the analog/digital converter is connected to the IC chip.

Among them, the capacitive sensor is, for example, C1 hereinafter, the emitter is, for example, TxC hereinafter, the receiver is, for example, RxC hereinafter, the filter is, for example, FILTER hereinafter, the variable gain amplifier is, for example, VGA hereinafter, the analog/digital converter is, for example, ADC hereinafter, the switch device is, for example, FTF hereinafter, and the charge amplifier can be, for example, composed of an operational amplifier and a capacitor, such as C2 hereinafter, or composed of an operational amplifier, C2 and a resistor, such as R1 hereinafter. For the connection of the above devices, please refer to the following.

Based on the above angle detection circuit, when the IC chip sends a level signal (specifically a high level signal or a low level signal is determined by the switching characteristics of the TFT) for controlling the conduction of the TFT through the signal line Cen, the TFT is turned on, TxC will emit a pulse signal, and the potential of RxC remains unchanged, and the current charge of the capacitor C1 will change at this time; the charge of the capacitor C1 is input to the operational amplifier OA through RxC, and the corresponding voltage is obtained after integration and amplification by the operational amplifier OA and input to the filter FILTER; the filter FILTER filters the voltage to filter out the voltage that is not generated by the pulse signal emitted by TxC, and inputs the filtered voltage to the variable gain amplifier VGA; the variable gain amplifier VGA performs gain processing on the voltage, so that the voltage finally input to the analog/digital converter ADC can be increased or decreased by multiples after being processed by the analog/digital converter ADC; finally, the analog/digital converter ADC converts the capacitance value (analog signal) determined by the charge and the voltage processed by the variable gain amplifier into a digital signal and sends it to the IC chip for processing, thereby realizing angle detection.

According to the first aspect, or any implementation of the first aspect above, the charge amplifier is composed of an operational amplifier, a capacitor and a resistor; wherein the capacitor is connected in parallel to the reverse input terminal and the output terminal of the operational amplifier, and the resistor is connected in parallel to the two electrodes of the capacitor.

The operational amplifier is, for example, an operational amplifier OA hereinafter, and the capacitor is, for example, C2 hereinafter.

According to the first aspect, or any implementation of the first aspect above, the charge amplifier is composed of an operational amplifier and a capacitor; wherein the capacitor is connected in parallel to the inverting input terminal and the output terminal of the operational amplifier.

The operational amplifier is, for example, an operational amplifier OA hereinafter, the capacitor is, for example, C2 hereinafter, and the resistor is, for example, R1 hereinafter.

It is understandable that for an ideal operational amplifier OA, only parallel capacitors are needed to form a charge amplifier, thereby realizing the integration of charge. However, in practical applications, in order to prevent the capacitor connected in parallel with the operational amplifier OA from saturation (caused by the bias voltage of the operational amplifier OA), a parallel resistor is also required. Based on this, a resistor R1 and a capacitor C2 are connected in parallel between the reverse input terminal and the output terminal of the operational amplifier OA. The charge amplifier based on this structure can not only realize the integration of charge, but also ensure the accuracy of the result.

According to the first aspect, or any implementation of the first aspect above, the switch device is further configured to be turned off according to a second level signal sent by the IC chip; wherein after the switch device is turned off, the capacitive sensor does not work.

The above-mentioned that the capacitive sensor does not work after the switch device is turned off means that the electronic device does not perform angle detection, but makes the display touch screen enter the touch detection mode or the display mode.

The description of the display mode and the touch detection mode can be found below and will not be repeated here.

According to the first aspect, or any one of the implementations of the first aspect above, the switch device is arranged in the bending area. In this way, there is no need to modify the manufacturing process of the display area of the display touch screen.

According to the first aspect, or any implementation of the first aspect above, the bending area is located in the non-encapsulation area of the display touch screen, and the display touch area is located in the encapsulation area of the display touch screen; wherein the TP traces of the display touch area close to the bending area are interconnected in the non-encapsulation area through the switch device to form a capacitive sensor. In this way, it is convenient to maintain the switch device located in the non-encapsulation area.

In the second aspect, the present application provides an angle detection method. It is applied to the folding screen device described in the first aspect or any possible implementation of the first aspect. The method includes: during the angle detection mode time period, the IC chip sends a first level signal, and the switch device is turned on; the IC chip sends a pulse signal, the emitter of the capacitive sensor generates a pulse signal, the potential of the receiving electrode of the capacitive sensor remains unchanged, and a changing charge is generated; the angle detection circuit obtains the charge generated by the capacitive sensor, and determines the capacitance value of the capacitive sensor based on the charge; the IC chip determines the folding angle of the display touch screen based on the capacitance value.

Wherein, for a switch device operating at a high level, the first level signal is, for example, a high level signal, so that the switch device can be turned on.

Wherein, for a switch device operating at a low level, the first level signal is, for example, a low level signal, so that the switch device can be turned on.

According to the second aspect, the angle detection circuit obtains the charge generated by the capacitive sensor and determines the capacitance value of the capacitive sensor based on the charge, including: the capacitive sensor outputs the charge to the charge amplifier through the receiving electrode; the charge amplifier obtains the charge generated by the capacitive sensor and integrates the charge to obtain a first voltage corresponding to the charge; the filter filters the first voltage to obtain a second voltage; the variable gain amplifier performs gain processing on the second voltage to obtain a third voltage; the analog/digital converter performs analog/digital conversion on the capacitance value determined by the third voltage and the charge to obtain a digital signal corresponding to the capacitance value.

It can be understood that the charge Q, voltage U, and capacitance C satisfy Q=CU. Based on this, by processing the charge, a voltage that satisfies the condition is obtained, so that the current capacitance value of the capacitive sensor can be determined according to the charge and voltage, and then the IC can determine the folding angle according to the capacitance value and the preset mapping relationship.

According to the second aspect, or any implementation method of the second aspect above, the IC chip determines the folding angle of the display touch screen based on the capacitance value, including: the IC chip determines the folding angle of the display touch screen based on the capacitance value and a preset mapping relationship, and the mapping relationship records the folding angles corresponding to different capacitance values.

In this way, by pre-establishing a mapping relationship between different capacitance values and folding angles, the folding angle of the display touch screen can be determined quickly and accurately through the mapping relationship.

According to the second aspect, or any implementation of the second aspect above, the method also includes: based on the characteristic that the capacitance value changes with the change of the folding angle, determining the relationship between different capacitance values and different folding angles, and obtaining a preset mapping relationship.

Exemplarily, in one implementation, the relationship between different capacitance values and different folding angles is determined through experiments.

According to the second aspect, or any implementation of the second aspect, the capacitance value is inversely proportional to the folding angle.

According to the second aspect, or any implementation of the second aspect above, the method further includes: when the angle detection mode time period is not reached, the IC chip sends a second level signal, and the switch device is turned off to make the display touch screen enter the touch detection mode or the display mode.

For a switch device operating at a high level, the second level signal is, for example, a low level signal, so that the switch device can be turned off.

Wherein, for a switch device operating at a low level, the second level signal is, for example, a high level signal, so that the switch device can be turned off.

According to the second aspect, or any implementation of the second aspect above, the method also includes: the method also includes: after the switching device is turned on and the IC chip sends a pulse signal, if it is detected that an object touches the area where the emitter and the receiver are located in the display touch screen; the current charge of the capacitive sensor is not processed.

In this way, when the charge of C1 changes, but a touch object, such as a finger or stylus, is detected at the electrodes of C1 (TxC and RxC), the current charge can be not used as a basis for angle detection, thereby avoiding the influence of false touch on angle detection and ensuring the stability and accuracy of angle detection.

In addition, since the second aspect and any implementation of the second aspect correspond to the first aspect and any implementation of the first aspect respectively, the technical effects corresponding to the second aspect and any implementation of the second aspect can refer to the technical effects corresponding to the above-mentioned first aspect and any implementation of the first aspect, which will not be repeated here.

In a third aspect, the present application provides a computer-readable medium for storing a computer program, wherein the computer program includes instructions for executing the method in the second aspect or any possible implementation of the second aspect.

The third aspect and any implementation of the third aspect correspond to the second aspect and any implementation of the second aspect, respectively. The technical effects corresponding to the third aspect and any implementation of the third aspect can refer to the technical effects corresponding to the above-mentioned second aspect and any implementation of the second aspect, which will not be repeated here.

In a fourth aspect, the present application provides a computer program, comprising instructions for executing the method in the second aspect or any possible implementation of the second aspect.

The fourth aspect and any implementation of the fourth aspect correspond to the second aspect and any implementation of the second aspect, respectively. The technical effects corresponding to the fourth aspect and any implementation of the fourth aspect can refer to the technical effects corresponding to the above-mentioned second aspect and any implementation of the second aspect, which will not be repeated here.

In a fifth aspect, the present application provides a chip, the chip comprising a processing circuit and a transceiver pin, wherein the transceiver pin and the processing circuit communicate with each other through an internal connection path, and the processing circuit executes the method in the second aspect or any possible implementation of the second aspect to control the receiving pin to receive a signal and control the sending pin to send a signal.

The fifth aspect and any implementation of the fifth aspect correspond to the second aspect and any implementation of the second aspect, respectively. The technical effects corresponding to the fifth aspect and any implementation of the fifth aspect can refer to the technical effects corresponding to the above-mentioned second aspect and any implementation of the second aspect, which will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a folding screen device according to an embodiment of the present application;

FIG2 is a second structural schematic diagram of a folding screen device provided in an embodiment of the present application;

FIG3 is a schematic diagram of a display touch screen provided in an embodiment of the present application;

FIG4 is a schematic diagram of the structure of a mutual capacitive display touch screen provided in an embodiment of the present application;

5 is a schematic diagram of voltage signals and pulse signals corresponding to two working modes of a mutual capacitance display touch screen provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a self-capacitive display touch screen provided in an embodiment of the present application;

7 is a schematic diagram of voltage signals and pulse signals corresponding to three working modes of the self-capacitive display touch screen provided in an embodiment of the present application;

FIG8 is a schematic diagram showing a packaging area and a non-packaging area of a touch screen provided in an embodiment of the present application;

FIG9 is a partial cross-sectional schematic diagram of a display touch screen using an Oncell touch mode provided in an embodiment of the present application;

FIG10 is a partial cross-sectional schematic diagram of a display touch screen using an Incell touch control method provided in an embodiment of the present application;

FIG11 is a schematic diagram of an angle detection circuit provided in an embodiment of the present application;

FIG12 is a schematic diagram of a touch mode circuit and an angle detection circuit of a mutual capacitance display touch screen provided in an embodiment of the present application;

FIG13 is a schematic diagram of a display mode circuit, a touch mode circuit and an angle detection circuit of a self-capacitive display touch screen provided in an embodiment of the present application;

FIG. 14 is a schematic diagram showing an exemplary method for determining the angle of a folding screen mobile phone.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

The term "and/or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects rather than to describe a specific order of objects. For example, a first target object and a second target object are used to distinguish different target objects rather than to describe a specific order of target objects.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more than two. For example, multiple processing units refer to two or more processing units; multiple systems refer to two or more systems.

The embodiment of the present application provides a folding screen device, which can be, for example, a folding screen mobile phone, a folding screen tablet computer, or other folding screen devices. The embodiment of the present application does not limit the specific form of the above folding screen devices. As shown in Figures 1 and 2, for the convenience of description, the folding screen device is an example of a folding screen mobile phone.

As shown in Figures 1 and 2, the folding screen mobile phone 10a includes a display touch screen 10a (hereinafter referred to as the outer screen), a folding axis 10b, a rear shell 10c, a middle frame 10d and a display touch screen 10e (hereinafter referred to as the inner screen). Among them, the inner screen 10e can include a screen unit 10e-1 and a screen unit 10e-2, and the middle frame 10d can include a middle frame 10d-1 surrounding the screen unit 10e-1 and a middle frame 10d-2 surrounding the screen unit 10e-2.

Continuing to refer to Figures 1 and 2, the outer screen 10a, the middle frame 10d-1 and the screen unit 10e-1 can form a housing cavity, and the rear shell 10c, the middle frame 10d-2 and the screen unit 10e-2 can also form a housing cavity. The corresponding mainboards and functional devices can be respectively arranged in these two housing cavities, and one of the housing cavities can also be provided with structures such as a battery (not shown in the figure). Functional devices may include, for example, display driver chips and processors. The processor sends a corresponding signal to the display driver chip so that the display driver chip determines that the outer screen 10a and/or the inner screen 10e are displayed.

In addition, it should be noted that in some implementations, the material of the rear cover 10c may include, for example, opaque materials such as plastic, plain leather, and glass fiber, or may include translucent materials such as glass. The material of the rear cover 10b is not limited in the present embodiment.

In addition, it should be noted that in some implementations, the outer screen 10a and the inner screen 10e may be, for example, an organic light emitting diode (OLED) display panel, a light emitting diode (LED) display panel, and an active matrix organic light emitting diode (AMOLED) display panel integrated with a touch sensor, wherein the LED display panel includes, for example, a Micro-LED display panel, a Mini-LED display panel, etc. The embodiment of the present application does not limit the types of the outer screen 10a and the inner screen 10e.

Continuing to refer to FIG. 1 and FIG. 2 , the screen unit 10e - 1 and the screen unit 10e - 2 can be folded along the folding axis 10b so that the inner screen 10e is in different states, such as an unfolded state, a semi-folded state, and a fully folded state.

Exemplarily, in some implementations, the unfolded state is, for example, the screen unit 10e-1, the folding axis 10b, and the screen unit 10e-2 are in the same plane, and the angle between the screen unit 10e-1 and the screen unit 10e-2 is 180°; the semi-folded state is, for example, the screen unit 10e-1, the folding axis 10b, and the screen unit 10e-2 are in different planes, and the angle between the screen unit 10e-1 and the screen unit 10e-2 is between 0° and 180°; the fully folded state is, for example, the screen unit 10e-1 completely overlaps with the screen unit 10e-2 along the folding axis 10b, and the angle between the screen unit 10e-1 and the screen unit 10e-2 is 0°.

In practical applications, switching from the inner screen 10e to the outer screen 10a, or switching from the outer screen 10a to the inner screen 10e, is determined according to the shape of the inner screen 10e. The shape of the inner screen 10e is determined by detecting the angle between the screen unit 10e-1 and the screen unit 10e-2.

In order to solve the problem in the background technology, the embodiment of the present application provides a display touch screen as an inner screen 10e, by interconnecting the TP (touch screen) wiring of the display touch screen, so as to form the two poles of the capacitive sensor. In this way, there is no need to set a device specifically for angle detection on the mainboard, such as the A+G device integrating the functions of accelerometer and gyroscope as mentioned in the relevant scheme, by obtaining the capacitance value of the capacitive sensor formed by the wiring, the angle between the screen unit 10e-1 and the screen unit 10e-2 can be determined according to the size of the capacitance value, and then the shape of the inner screen 10e is determined, so as to switch from the inner screen 10e to the outer screen 10a, or from the outer screen 10a to the inner screen 10e. Therefore, by using the display touch screen provided by this embodiment as the inner screen 10e, since there is no need to use dual A+G devices or other angle detection devices, angle detection can be achieved based on the wiring of the display touch screen itself, so the implementation cost can be greatly reduced, and it is also beneficial to the mainboard layout.

In addition, since there is no need to use dual A+G devices or other angle detection devices, angle detection can be achieved based on the wiring of the display touch screen itself, so the failure of the dual A+G devices or other angle detection devices will not cause the angle detection function to fail. That is, the stability of angle detection can be guaranteed.

The specific structure of the display touch screen as the inner screen 10e provided in the embodiment of the present application is introduced below.

As shown in FIG3 , the display touch screen 20 provided in this embodiment includes a bending area 20a (the area where the folding axis 10b in FIG1 and FIG2 is located), an interconnection electrode area 20b and a display touch area 20c. The interconnection electrode area 20b includes an emitter 20b-1 and a receiving electrode 20b-2, and the display touch area 20c includes a display touch area 20c-1 and a display touch area 20c-2.

Continuing to refer to Figure 3, the emitter 20b-1 and the receiver 20b-2 are respectively located on both sides of the bending area 20a, and close to the bending area 20a. This can avoid the situation where the emitter 20b-1 and the receiver 20b-2 sense the capacitance value changes due to accidental touch by the user, thereby triggering angle detection, thereby avoiding unreasonable switching between the inner screen and the outer screen. In this way, while taking into account the angle detection function, the user experience can be guaranteed as much as possible.

In addition, it should be noted that, in practical applications, the interconnection electrode region 20b is not limited to the long strip shape shown in FIG. 3 , but may also be a line shape or other shapes, which is not limited in this embodiment.

In addition, it should be noted that the switching from the inner screen 10e to the outer screen 10a in the above embodiment, for example, refers to changing the display and operation of the inner screen 10e to the display and operation of the outer screen 10a; correspondingly, the switching from the outer screen 10a to the inner screen 10e in the above embodiment, for example, refers to changing the display and operation of the outer screen 10a to the display and operation of the inner screen 10e. That is, whichever screen is switched to, the display and operation will be performed on that screen.

In addition, it should be noted that in order to enable the display touch screen 20 to quickly detect the capacitance value and then determine the angle, in some implementations, the display touch screen 20 is preferably AMOLED.

It is understandable that in this embodiment, the display touch screen 20 is preferably AMOLED because AMOLED is currently a display touch screen that can be mass-produced and folded, that is, it can achieve flexible display. In practical applications, if there are other flexible display screens that can be mass-produced with the development of folding screen technology, the display touch screen can also be other flexible display screens that can be mass-produced, and this embodiment does not limit this.

In addition, it should be noted that the types of display touch screens (hereinafter referred to as TP) that are currently more popular can be divided into two categories: self-capacitive and mutual-capacitive. Since the self-capacitive TP and the mutual-capacitive TP include different routings, the specific mutual-capacitive TP has two routings, while the self-capacitive TP has only one routing, for these two types of TP, if you want to interconnect the routings to form a capacitive sensor and then detect the angle by detecting the capacitance, the routing interconnection method is different. For a better understanding, the routing interconnection method of the self-capacitive TP and the mutual-capacitive TP is specifically introduced in conjunction with the accompanying drawings.

Referring to FIG. 4 , a schematic diagram of a wiring interconnection structure of a mutual capacitance TP is exemplarily provided.

As shown in FIG4 , the mutual-capacitive TP includes transversely distributed routing (referred to as Tx in this embodiment, such as Tx1 to TxN distributed in regions 20c-1, 20b-1, 20c-2, and 20b-2 as shown in FIG4 ) and longitudinally distributed routing (referred to as Rx in this embodiment, such as Rx1 to RxN distributed in regions 20c-1, 20b-1, 20c-2, and 20b-2 as shown in FIG4 ).

It should be noted that, since the routing lines parallel to the folding axis set at the bending area 20a are all close to the bending area 20a, the routing lines parallel to the folding axis set at the bending area 20a are selected for interconnection to form the two poles of the capacitive sensor, which can ensure the sensitivity of the capacitance value detection, and being away from the edge of the screen can reduce false touches, thereby ensuring accuracy; and the two end areas of the vertically distributed routing lines will be away from the bending area 20a, so if the routing lines perpendicular to the folding axis set at the bending area 20a are selected for interconnection to form the two poles of the capacitive sensor, the detection sensitivity of the capacitance value will be reduced, and the edge part is also prone to affect the transfer curve of the detection result due to false touches. Therefore, in some implementations, in order to ensure the accuracy of angle detection, when forming a capacitive sensor by interconnecting the routing lines, the routing lines parallel to the folding axis set at the bending area 20a can be selected. Continuing to refer to Figure 4, it can be seen that in the mutual capacitance TP, the Rx routing lines distributed laterally are parallel to the folding axis, so for the mutual capacitance TP, the capacitance sensor is formed by interconnecting the Rx routing lines.

For example, in some other implementations, if the longitudinally distributed Tx lines are parallel to the folding axis, a capacitive sensor may be formed by interconnecting the Tx lines, which is not limited in this embodiment.

From the description of the above embodiments, it can be seen that in order to avoid the user's accidental touch, which causes the capacitance value detected by the capacitive sensor formed by the interconnected wiring to change, the wiring near the bending area 20a is usually interconnected. Based on this, FIG4 takes the example of connecting two adjacent Rx wirings near the bending area 20 through a controllable circuit.

The controllable circuit mentioned above may include, for example, a thin film field effect transistor (TFT) and a signal line Cen.

In addition, it should be noted that in actual applications, in addition to selecting TFT as a switching device, other switching devices can also be selected, such as connecting through a metal oxide semiconductor field effect transistor. The specific switching device can be selected according to business needs, and this embodiment does not limit this.

For the convenience of description, this embodiment takes the switching device as a TFT as an example.

Continuing to refer to FIG. 4 , for example, for the left side area of the bending area 20a, Rx1 and Rx2 are connected through TFT1. In this way, an emitter 20b-1 (hereinafter referred to as TxC) can be formed on the left side of the bending area 20a and close to the bending area 20, and the other area on the left side of the bending area 20a is the display touch area 20c-1 mentioned in the above embodiment.

Continuing to refer to FIG. 4 , for example, for the right side of the bending area 20a, Rx1 and Rx2 are connected through TFT 2. In this way, a receiving electrode 20b-2 (hereinafter referred to as RxC) can be formed on the right side of the bending area 20a and close to the bending area 20, and the other area on the right side of the bending area 20a is the display touch area 20c-2 mentioned in the above embodiment.

Continuing to refer to FIG. 4 , for example, in this embodiment, the emitter 20b-1 is formed by connecting Rx1 and Rx2 in parallel in the display touch area 20c-1 near the left side of the bending area 20a through FTF1, and the receiver 20b-2 is formed by connecting Rx1 and Rx2 in parallel in the display touch area 20c-2 near the right side of the bending area 20a through FTF2. The emitter 20b-1 is used to transmit pulse signals, and the receiver 20b-2 is used to sense signals, so that the capacitance value can be sensed.

It should be understood that the above description is only an example listed for a better understanding of the technical solution of this embodiment, and is not the only limitation to this embodiment. In practical applications, multiple adjacent lines in the display touch area 20c-1 near the left side of the bending area 20a can also be connected through multiple TFTs, and multiple adjacent lines in the display touch area 20c-2 near the right side of the bending area 20a can be connected through multiple TFTs. For example, Rx1 and Rx2 in the display touch area 20c-1 near the left side of the bending area 20a in FIG4 are connected in parallel through a TFT, Rx2 and Rx3 in the display touch area 20c-1 near the left side of the bending area 20a are connected in parallel through a TFT, Rx1 and Rx2 in the display touch area 20c-2 near the right side of the bending area 20a are connected in parallel through a TFT, and Rx2 and Rx3 in the display touch area 20c-2 near the right side of the bending area 20a are connected in parallel through a TFT.

Thus, by connecting adjacent lines in the display touch area 20c-1 near the left side of the bending area 20a through one or more TFTs, the adjacent lines in the display touch area 20c-2 near the right side of the bending area 20a are also connected through one or more TFTs, and the gates of all TFTs connected to the lines are connected to the signal line Cen (used to send high-level signals or low-level signals). In this way, the high-level signal sent through the signal line Cen can control the TFT to be turned off, and the low-level signal sent can control the TFT to be turned on. When the TFT is turned on, the lines in the display touch area 20c-1 near the bending area 20a can be connected in parallel to form the emitter 20b-1, and the lines in the display touch area 20c-2 near the bending area 20a can be connected in parallel to form the receiving electrode 20b-2. In this case, if the display touch area 20c-1 and the display touch area 20c-2 are folded along the bending area 20a, as the folding angle changes, the capacitance value formed between the emitter 20b-1 and the receiving electrode 20b-2 will change, thereby realizing angle detection.

Correspondingly, the level signal output by the signal line Cen can be output according to the switching characteristics of the selected MOS tube. For example, for the PMOS tube, the output high level signal can be set to control the PMOS tube to be turned off, and the output low level signal can be set to control the PMOS tube to be turned on; for the NMOS tube, the output low level signal can be set to control the PMOS tube to be turned off, and the output high level signal can be set to control the PMOS tube to be turned on.

It should be understood that the above description is merely an example listed for a better understanding of the technical solution of this embodiment, and is not intended to be the sole limitation to this embodiment.

As for the relationship between the capacitance value and the folding angle, it can be known through experiments that the two are usually inversely proportional, that is, the larger the folding angle, the smaller the capacitance value, and the smaller the folding angle, the larger the capacitance value. Based on this characteristic, when the display touch screen 20 provided in this embodiment is used as the inner screen 10e, the specific triggering conditions when the inner screen 10e switches to the outer screen 10a, or switches from the outer screen 10a to the inner screen 10e, can be set according to actual business needs when the folding angle is within a preset interval range, so as to switch from the inner screen 10e to the outer screen 10a, and when it is within another preset interval range, so as to switch from the outer screen 10a to the inner screen 10e. In this way, according to the corresponding relationship between the folding angle and the capacitance value, the capacitance value interval for switching from the inner screen 10e to the outer screen 10a, and the capacitance value interval for switching from the outer screen 10a to the inner screen 10e can be determined.

It should be understood that the above description is merely an example listed for a better understanding of the technical solution of this embodiment, and is not intended to be the sole limitation to this embodiment.

In addition, it should be noted that whether it is the bending area 20a, or the area 20b-1 where TxC is located, or the area 20b-2 where RxC is located, they all have the functions of display and touch, but on this basis, the bending area 20a can be bent, and areas 20b-1 and 20b-2 can realize angle detection.

In addition, it should be noted that when two adjacent Rx lines are connected through a TFT, it is not limited to which Rx line is connected to the source of the TFT and which Rx line is connected to the drain of the TFT, as long as the two adjacent Rx lines are connected through a TFT.

In addition, it should be noted that in actual applications, the Rx lines connected through TFTs are not limited to two adjacent lines, but can be multiple lines, as long as every two adjacent Rx lines are connected through corresponding TFTs, and the gates of all TFTs connected to the Rx lines are connected to the same signal line Cen.

Continuing to refer to FIG. 4, illustratively, the gates of all TFTs connected to the Rx wiring, such as TFT1 and TFT2 in FIG. 4, ultimately need to be connected to the same signal line Cen, and the other end of the signal line Cen is connected to an integrated circuit chip (IC chip) for controlling the level signal provided on the mainboard. In this way, according to the working state of the TFT at a high level and a low level, different level signals are sent through the signal line Cen, so that the TFT can be controlled to realize the switching characteristics.

For example, for a TFT that is turned on at a low level and turned off at a high level, a low-level signal can be sent through the signal line Cen to control each TFT connected to the Rx line to be turned on, thereby realizing parallel connection between the two poles, that is, parallel connection between TxC and RxC. In this way, when TxC transmits a pulse signal, RxC can sense it, and then sense the current capacitance value to achieve angle detection.

Correspondingly, when a high-level signal is sent through the signal line Cen, each TFT connected to the Rx line can be controlled to be turned off, so as to achieve separation between the two poles, that is, separation between TxC and RxC, so that the display touch screen can realize touch detection, that is, in this case, if a change in capacitance value is detected, angle detection will not be triggered, so that the mutual capacitance TP provided in this embodiment takes into account both the touch function and the angle detection function.

For example, for a TFT that is turned on at a high level and turned off at a low level, a high level signal can be sent through the signal line Cen to control each TFT connected to the Rx line to be turned on, thereby realizing parallel connection between the two poles, that is, parallel connection between TxC and RxC. In this way, when TxC transmits a pulse signal, RxC can sense it, and then sense the current capacitance value to achieve angle detection.

Correspondingly, when a low-level signal is sent through the signal line Cen, each TFT connected to the Rx line can be controlled to be turned off, thereby achieving separation between the two poles, that is, separation between TxC and RxC. In this way, the display touch screen can realize touch detection, that is, in this case, if a change in capacitance value is detected, angle detection will not be triggered.

It should be understood that the above description is merely an example listed for a better understanding of the technical solution of this embodiment, and is not intended to be the sole limitation to this embodiment.

In addition, it should be noted that since the mutual capacitance TP has a cathode specifically for realizing the display function, the internal wiring only needs to be divided into a touch mode and an angle detection mode. It can be seen that in this embodiment, by connecting the Rx wiring adjacent to the mutual capacitance TP near the bending area 20a, the wiring of the mutual capacitance TP can support angle detection on the basis of originally supporting the touch mode (touch detection).

In addition, it should be noted that, in this embodiment, in order to make the mutual capacitance TP support touch mode and angle detection at the same time, the display frequency of the inner screen per second, or the refresh frequency (hereinafter referred to as display frequency) can be divided according to the required display effect, the capacitance sensor formed by the interconnection, or the speed of power-on and power-off detection of the set touch sensor, such as performing touch detection within a time range corresponding to a certain Hz frequency, even if the mutual capacitance TP is in touch mode, and performing angle detection within a time range corresponding to another Hz frequency, even if the mutual capacitance TP can realize the angle detection function. For better understanding, the following is a specific description in conjunction with FIG. 5.

Referring to FIG. 5 , illustratively, assuming that for a certain mutual capacitance TP, the display frequency corresponding to each second is (F11+F12) Hz, if the speed of power-on and power-off is detected according to the required display effect, the capacitance sensor formed by interconnection, or the set touch sensor, when producing the mutual capacitance TP, it is set to perform touch detection within the time T11 range corresponding to F11Hz, and perform angle detection within the time T12 range corresponding to F12. Since there is no interference between the two modes in time, such as only touch detection is performed in the T11 cycle, and only angle detection is performed in the T12 cycle, even if both modes determine the change in capacitance value by sensing the pulse signal, angle detection will not be performed during the working time of the touch mode, and touch detection will not be performed during the working time of the angle detection mode. Therefore, based on this characteristic, different level signals can be sent by the signal line Cen according to the working time corresponding to different modes (Figure 5 takes the TFT with low level on and high level off as an example). For example, in the T11 cycle, when the touch mode needs to be started, the signal line Cen sends a high level signal to control each TFT connected to the Rx line to turn off, thereby achieving separation between the two poles, so that the angle detection mode can be switched to the touch mode.

Correspondingly, in the T12 cycle, when the angle detection mode needs to be started, the signal line Cen sends a low-level signal to control each TFT connected to the Rx line to be turned on, thereby achieving parallel connection between the two electrodes, so that the touch mode can be switched to the angle detection mode.

Therefore, this embodiment connects the mutual-capacitance TP near the Rx trace adjacent to the bending area 20a, and controls the on and off of the TFT through different level signals sent by the signal line Cen, so that the mutual-capacitance TP provided by this embodiment can perform touch detection and angle detection according to the time period shown in Figure 5 every second during the use of the user, thereby taking into account both the touch function and the angle detection function.

For example, within the time range T11 corresponding to F11Hz in the Nth second, the signal line Cen transmits a high-level signal, so that the TFT in the working mode at the low level is disconnected, and the signal line Cen also sends a pulse signal. At this time, the touch sensor will detect whether there is an object touching the mutual capacitance TP. If so, it will respond to the touch operation, such as opening a certain application. If not, when entering the time range T12 corresponding to F12 Hz, the signal line Cen transmits a low-level signal, so that the TFT in the working mode at the low level is turned on. At this time, the emitter 20b-1 and the receiving electrode 20b-2 mentioned above will be formed. In this way, after the IC chip sends a pulse signal, the emitter 20b-1 will generate a pulse signal, and the receiving electrode 20b-2 will sense it, and then the angle detection will be realized according to the sensed capacitance.

Accordingly, if it is determined based on the detected capacitance that the angle between the screen unit 10e-1 and the screen unit 10e-2 is less than a certain threshold, the inner screen is turned off and switched to the outer screen, so that the outer screen is in a light state. Otherwise, the current state is maintained, and at the N+1th second, touch detection and angle detection are continued according to the above cycle.

It is understandable that the threshold mentioned above can be set according to actual needs, such as being set to 30 degrees, and this embodiment does not limit this.

In addition, it should be noted that in actual applications, after switching from the inner screen to the outer screen and making the outer screen in the bright screen state, if the user does not operate the outer screen within the set time content, such as 30 seconds, the outer screen can be turned off to reduce the power consumption of the device.

It should be understood that the above description is merely an example listed for a better understanding of the technical solution of this embodiment, and is not intended to be the sole limitation to this embodiment.

6 , a schematic diagram of a wiring interconnection structure of a self-contained TP is exemplarily provided.

As shown in FIG6 , the self-capacitive TP only includes one type of wiring, wherein each touch unit corresponds to a separate wiring.

Similarly, in order to prevent the user from touching by mistake, which may cause the capacitance value detected by the capacitive sensor formed by interconnecting the wiring, the wiring close to the bending area 20a is usually selected to be interconnected. As shown in FIG6 , for example, the wiring of a column of touch units on both sides of the bending area 20, which is closest to the bending area 20a, can be selected and connected in pairs through TFTs.

Continuing to refer to FIG6, for the sake of convenience, the touch units that need to be connected by wiring on the left side of the bending area 20a are described as P1, P2, P3, and P4 in sequence, and the touch units that need to be connected by wiring on the right side of the bending area 20a are described as P5, P6, P7, and P8 in sequence. Accordingly, according to the connection requirements of two adjacent wirings being connected to the same TFT, for the area on the left side of the bending area 20a, the wiring corresponding to P1 and the wiring corresponding to P2 can be interconnected through TFT1, the wiring corresponding to P2 and the wiring corresponding to P3 can be interconnected through TFT2, the wiring corresponding to P3 and the wiring corresponding to P3 can be interconnected through TFT3, and the gates of TFT1, TFT2, and TFT3 are connected to the same signal line Cen, thereby forming the emitter 20b-1 of the capacitive sensor (hereinafter referred to as TxC), and the other areas on the left side of the bending area 20a are the display touch mentioned in the above embodiment. Area 20c-1; for the area on the right side of the bending area 20a, the wiring corresponding to P5 and the wiring corresponding to P6 can be interconnected through TFT4, the wiring corresponding to P6 and the wiring corresponding to P7 can be interconnected through TFT5, the wiring corresponding to P7 and the wiring corresponding to P8 can be interconnected through TFT6, and the gates of TFT4, TFT5 and TFT6 are connected to the signal line Cen connecting TFT1, TFT2 and TFT3, thereby forming a receiving electrode 20b-2 (hereinafter referred to as RxC) of the capacitive sensor, and the other area on the left side of the bending area 20a is the display touch area 20c-2 mentioned in the above embodiment.

Similarly, for the self-capacitive TP, whether it is the bending area 20a, or the area 20b-1 where the TxC is located, or the area 20b-2 where the RxC is located, they all have the functions of display and touch, but on this basis, the bending area 20a can be bent, and the areas 20b-1 and 20b-2 can realize angle detection.

In addition, it should be noted that when two adjacent wires are connected through a TFT, it is not limited to which wire is connected to the source of the TFT and which wire is connected to the drain of the TFT, as long as the two adjacent wires are connected through a TFT.

In addition, it should be noted that in actual applications, the wiring connected by TFT is not limited to the one column shown in FIG. 5, but may be multiple columns close to the bending area 20a, or may be part of the wiring close to the center of the bending area 20a in one column, or part of the wiring close to the center of the bending area 20a in multiple columns close to the bending area 20a, which is not limited in this embodiment. As long as every two adjacent wirings are connected through corresponding TFTs, the gates of all the TFTs connecting the wirings are connected to the same signal line Cen.

Continuing to refer to FIG. 6, for example, the gates of all TFTs connected to the wiring of the accessory areas on both sides of the bending area 20a, such as TFT1 to TFT6 in FIG. 6, are finally connected to the same signal line Cen, and the other end of the signal line Cen is connected to an IC chip (Integrated Circuit Chip) for controlling the level signal set on the main board. In this way, according to the working state of the TFT at a high level and a low level, different level signals are sent through the signal line Cen to control the switching characteristics of the TFT.

For details on how the signal line Cen transmits different level signals sent by the IC chip in the self-capacitive TP, and then controls TFT1 to TFT6 to realize the switching characteristics, please refer to the description of the above mutual-capacitive TP embodiment, which will not be repeated here.

In addition, it should be noted that for the mutual capacitance TP, there is a cathode specifically for realizing the display function, so the internal wiring only needs to be divided into touch mode and angle detection mode, while for the self-capacitive TP, there are some cathodes used for display as touch electrodes, that is, the wiring is integrated in the cathode, and the cathode is usually close to the bending area 20a. It can be seen that this embodiment connects the wiring adjacent to the bending area 20a of the self-capacitive TP (the cathode that has both display function and touch function), so that the cathode of the self-capacitive TP can support angle detection on the basis of originally supporting the touch mode (touch detection) and display mode. For a better understanding, the following is a specific explanation in conjunction with Figure 7.

Referring to FIG. 7 , for example, assuming that for a certain self-capacitive TP, the display frequency corresponding to each second is (F21+F22+F23) Hz, if the speed of power-on and power-off is detected according to the required display effect, the capacitance sensor formed by the interconnection, or the set touch sensor, when producing the self-capacitive TP, it is set to perform display detection within the time T21 range corresponding to F21Hz, perform touch detection within the time T22 range corresponding to F22Hz, and perform angle detection within the time T23 range corresponding to F23. Since there is no interference between these three modes in time, such as only display is performed in the T21 period, only touch detection is performed in the T22 period, and only angle detection is performed in the T23 period, even if both touch detection and angle detection determine the change in capacitance value by sensing the pulse signal, angle detection will not be performed during the working time of the touch mode, and touch detection will not be performed during the working time of the angle detection mode. Therefore, based on this characteristic, according to the working time corresponding to different modes, different level signals can be sent by the signal line Cen (Figure 7 takes the TFT with low level on and high level off as an example). For example, in the T21 cycle, when the display mode needs to be started, the signal line Cen sends a high level signal to control each TFT connected to the Rx line to be turned off to achieve separation between the two poles. In addition, since the display mode does not generate a pulse signal, after sending a high level signal on the signal line Cen to control each TFT connected to the Rx line to be turned off to achieve separation between the two poles, if no pulse signal is currently sensed, it indicates that the current mode is switched from the angle detection mode to the display mode rather than the touch mode.

Correspondingly, in the T22 cycle, when the touch mode needs to be started, the signal line Cen sends a high level signal to control each TFT connected to the Rx line to turn off, so as to achieve separation between the two poles. If a pulse signal is currently sensed, it indicates that the current mode is switched from the angle detection mode to the touch mode display mode rather than the display mode.

Correspondingly, in the T23 cycle, when the angle detection mode needs to be started, the signal line Cen sends a low-level signal to control each TFT connected to the Rx line to be turned on, thereby achieving parallel connection between the two electrodes, so that it is possible to switch from the touch mode or the display mode to the angle detection mode.

Therefore, this embodiment connects the adjacent wirings of the self-capacitive TP near the bending area 20a, and controls the on and off of the TFT through different level signals sent by the signal line Cen, so that the self-capacitive TP provided by this embodiment can perform display detection, touch detection and angle detection according to the time period shown in Figure 7 every second during the use of the user, taking into account both the display function, the touch function and the angle detection function.

For example, within the time range T21 corresponding to F21Hz in the Mth second, the signal line Cen transmits a high-level signal, so that the TFT in the working mode at a low level is disconnected, but the signal line Cen does not transmit a pulse signal. At this time, the functional module used to detect the screen status, such as turning the screen on or off, will detect the screen status of the self-capacitive TP.

When entering the time range T22 corresponding to F22Hz, the signal line Cen transmits a high-level signal, so that the TFT in the working mode at the low level is disconnected, and the signal line Cen also sends a pulse signal. At this time, the touch sensor will detect whether there is an object touching the self-capacitive TP. If so, it will respond to the touch operation, such as opening a certain application. If not, when entering the time range T23 corresponding to F23Hz, the signal line Cen transmits a low-level signal, so that the TFT in the working mode at the low level is turned on. At this time, the emitter 20b-1 and the receiving electrode 20b-2 mentioned above will be formed. In this way, after the IC chip sends a pulse signal, the emitter 20b-1 will generate a pulse signal, and the receiving electrode 20b-2 will sense it, and then the angle detection will be realized according to the sensed capacitance.

Accordingly, if it is determined based on the detected capacitance that the angle between the screen unit 10e-1 and the screen unit 10e-2 is less than a certain threshold, the inner screen is turned off and switched to the outer screen, so that the outer screen is in a bright screen state. Otherwise, the current state is maintained, and at the M+1th second, display detection, touch detection and angle detection are continued according to the above cycle.

It is understandable that the threshold mentioned above can be set according to actual needs, such as being set to 30 degrees, and this embodiment does not limit this.

In addition, it should be noted that in actual applications, after switching from the inner screen to the outer screen and making the outer screen in the bright screen state, if the user does not operate the outer screen within the set time content, such as 30 seconds, the outer screen can be turned off to reduce the power consumption of the device.

It should be understood that the above description is merely an example listed for a better understanding of the technical solution of this embodiment, and is not intended to be the sole limitation to this embodiment.

In addition, it should be noted that, whether it is a mutual capacitance TP or a self capacitance TP, the method of realizing wiring interconnection through TFT is realized in the non-packaged area of the display touch screen, that is, the bending area 20a in the above embodiment drawings, and the area where the emitters 20b-1 and 20b-2 formed on both sides of the bending area 20a are located correspond to the non-packaged area of the display touch screen, as shown in Figure 8, and the area where the display touch area 20c-1 and the display touch area 20c-2 are located corresponds to the packaged area of the display touch screen, as shown in Figure 8. It should be understood that Figure 8 only shows the non-packaged area of the display touch screen and the display touch area on one side.

In addition, it should be noted that in practical applications, whether it is a mutual capacitance TP or a self capacitance TP, due to the different touch modes it supports, such as the Oncell touch mode and the Incell touch mode, its preparation process will also be different, which will lead to different positions of the wiring distribution that needs to be interconnected in this embodiment. Therefore, by determining the touch mode of the display touch screen, it can be determined in which layer of the packaging area to complete the wiring interconnection.

The so-called Incell refers to a method of embedding the touch panel function into the liquid crystal pixels, generally integrated with the liquid crystal layer; the so-called Oncell refers to a method of embedding the touch screen between the color filter substrate and the polarizer of the display screen, that is, equipping the liquid crystal panel with a touch sensor.

For the sake of convenience, this embodiment takes AMOLED as an example. For AMOLED, Incell means realizing TP wiring by using OLED cathode, and Oncell means preparing TP wiring on OLED encapsulation layer.

In order to better understand the position of the TP traces that need to be interconnected in the AMOLED type display touch screen, the following combines Figures 9 and 10 to introduce the structures of the display touch screens of the Oncell touch mode and the Incell touch mode, respectively.

Referring to FIG. 9 , a partial cross-sectional schematic diagram of a display touch screen using an Oncell touch mode is exemplarily provided.

Exemplarily, in some feasible implementations, the process flow of preparing the display touch screen of the structure shown in FIG. 9 may be, for example:

(1.1) A polymer material polyimide (PI) is used to form a polymer film through spin coating and baking, and the formed polymer film is then used as a substrate for a display touch screen of the Oncell touch mode (the PI layer shown in FIG. 9 ).

(1.2) Plasma Enhanced Chemical Vapor Deposition (PECVD) is used to deposit a buffer layer (the buffer layer shown in FIG. 9 ) on the PI layer to protect the upper layer.

Exemplarily, in a feasible implementation, the buffer layer includes silicon dioxide (SiO 2 ) and silicon nitride (SiN).

(1.3) SiO2 is deposited on the buffer layer using PECVD to form a gate insulation layer (GI) (GI layer shown in FIG. 9 ).

(1.4) A low-temperature polysilicon layer (Poly-Si) (P-Si layer shown in FIG. 9 ) is formed in the GI layer in the encapsulation area and the non-encapsulation area respectively as an active layer of the TFT of the display driving circuit.

(1.5) Magnetron sputtering is performed on metal molybdenum (Mo) on the GI layer to form gate electrodes of TFTs located in the packaging area and the non-packaging area, respectively (Gate shown in FIG. 9 ).

(1.6) SiO2 and SiN are deposited on the GI layer using PEEVCVD to form an interlayer dielectric layer (ILD layer shown in FIG. 9 ).

(1.7) Magnetron sputtering is performed on the metal on the ILD layer by magnetron sputtering to form a source and a drain located in the packaging area and the non-packaging area, respectively (SD shown in FIG. 9 ).

It is understandable that the metal used to form the source (Source, S) and the drain (Drain, D) can be selected according to business requirements, and this embodiment does not limit this.

(1.8) A planarization layer (PLN) is formed on the ILD layer (the PLN layer shown in FIG. 9 ).

(1.9) An anode (Anode shown in FIG. 9 ) for displaying a touch screen is formed on the PLN layer.

(1.10) A pixel definition layer (PDL) (PDL layer shown in FIG. 9 ) is formed in the area where the packaging area is located on the PLN layer by using a polymer material that can define the pixel size of the display touch screen.

(1.11) The PDL layer at the location of the Anode is etched to expose the Anode, and an electroluminescent layer (the EL layer shown in FIG. 9 ) is formed on the Anode.

(1.12) A cathode (Cathode shown in FIG. 9 ) for displaying a touch screen is formed on the EL layer. By forming an EL layer on an Anode and a Cathode on the EL layer, an organic light emitting diode (OLED) can be obtained.

(1.13) A thin film encapsulation layer (Thin Film Encapsulation) (TFE layer shown in FIG. 9 ) is formed on the cathode where the encapsulation area is located to protect the OLED screen.

(1.14) Prepare metal wiring of TP (such as Rx wiring and Tx wiring for realizing touch function) on the TFE layer, set a circular polarizer above the TP, and set a glass cover plate above the circular polarizer.

It can be understood that the preparation process of the above-mentioned touch display screen with Oncell touch mode is similar to the current mainstream AMOLED products. The above-mentioned steps (1.1) to (1.14) are only for reflecting the structure of each layer of the touch display screen with Oncell touch mode. The specific preparation process and implementation process can refer to the AMOLED product, which will not be repeated in this embodiment.

From the above description and the partial cross-section of the touch display screen with the Oncell touch mode shown in FIG9 , it can be seen that there is no packaging layer under the TP wiring in the non-packaging area, so the TP wiring in the non-packaging area can be connected to the SD of the TFT, thereby enabling the touch display screen with the Oncell touch mode to realize the angle detection function provided in this embodiment.

It is understandable that if the TP wiring in the packaging area can be connected to the TFT with the improvement of the manufacturing process of the display touch screen, the TP wiring interconnection method provided in this embodiment can also be completed in the packaging area, and this embodiment does not limit this.

Referring to FIG. 10 , a partial cross-sectional schematic diagram of an Incell touch screen display is exemplarily provided.

As shown in FIG10 , the structure of the display touch screen of the Incell touch mode from the PI layer to the EL layer is the same as that of the display touch screen of the Oncell touch mode shown in FIG9 . For the formation of these layers, please refer to the above steps (1.1) to (1.11), as well as the preparation process and implementation process of the current mainstream AMOLED products, which will not be repeated here.

Continuing to refer to FIG10 , the difference between the Incell touch screen that uses the cathode (Cathode) of the display touch screen as a touch electrode and the Oncell touch screen is that after forming the Cathode, it is also necessary to form a routing pattern on the Cathode so that the Cathode can be used as both a display electrode and a touch electrode, which is represented by Cathode (TP N) in FIG10 .

For example, in some feasible implementations, a process flow of forming a wiring pattern on a Cathode to obtain a Cathode (TP N) may be, for example:

(2.1) After the PDL layer is cured, an aluminum oxide film (AL shown in FIG. 10 ) is formed on the PDL layer by magnetron sputtering, and an indium tin oxide film (ITO shown in FIG. 10 ) is formed on the AL film by magnetron sputtering.

Exemplarily, in a feasible implementation, other film layer combinations with higher etching selectivity ratios (wet etching) may also be selected, such as AL and ITO as shown in FIG. 10 .

(2.2) After exposure, wet etching is used to form an undercut (narrower at the bottom and wider at the top) film structure as shown in Figure 10. In this way, when the PDL layer is used to prepare the cathode by evaporation, due to the existence of the AL/ITO undercut structure, it will be disconnected at the location of this structure (as shown in Figure 10). In this way, the cathode layer will be isolated, forming a wiring pattern, and then a cathode (TP N) will be obtained.

(2.3) A thin film encapsulation layer (Thin Film Encapsulation) (TFE layer shown in FIG. 10 ) is formed on the cathode (TP N) in the area where the encapsulation area is located to protect the OLED screen.

From the above description and the partial cross-section of the touch display screen with Incell touch mode shown in FIG10 , it can be known that the wirings that need to be interconnected in the touch display screen with Incell touch mode are located on the Cathode (TP N). Therefore, in the non-packaged area, the wirings located at the above positions can be connected through TFT (the self-capacitive TP does not specifically distinguish between wiring types and is directly represented by TPN and TPN+1), so that the touch display screen with Incell touch mode can realize the angle detection function provided in this embodiment.

It should be understood that the above description is only an example for better understanding the technical solution of this embodiment, and is not the only limitation to this embodiment. In practical applications, no matter which process the display touch screen is made with, as long as the location of the wiring can be determined, the connection can be achieved in the non-packaging area through TFT or other switching devices according to the wiring interconnection method provided in this embodiment.

With respect to the display touch screen that implements wiring interconnection provided in the above-mentioned embodiment, in order to implement angle detection according to the change of capacitance value, the embodiment of the present application further provides an angle detection circuit.

The specific structure of the angle detection circuit provided in the embodiment of the present application is introduced below.

As shown in FIG. 11 , in this embodiment, the angle detection circuit includes a capacitor C1, a capacitor C2, a resistor R1, an operational amplifier OA, a filter FILTER, a variable gain amplifier VGA, an analog/digital converter ADC, an IC chip, and a switching device, such as a TFT.

Among them, the IC chip is used to output high-level signals or low-level signals, and to determine the capacitance value to achieve angle detection and other operations.

Capacitor C1 is a capacitive sensor formed by interconnecting the wiring in the display touch screen through switching devices such as TFT. The emitter of capacitor C1, namely TxC mentioned in the above embodiment, is connected to the IC chip through switching devices such as TFT1 via the signal line Cen, and is used to generate a pulse signal when the switching devices such as TFT1 are turned on according to the high level signal/low level signal transmitted by the signal line Cen. The receiving electrode of capacitor C1, namely RxC mentioned in the above embodiment, is connected to the IC chip through switching devices such as TFT2 via the signal line Cen, and is used to sense the pulse signal generated by TxC when the switching devices such as TFT2 are turned on according to the high level signal/low level signal transmitted by the signal line Cen.

The connection method of the gate, drain, source of TFT1 and TFT2 and the emitter and receiver of capacitor C1, as well as the signal line Cen can refer to the description of the above embodiment, which will not be repeated here.

It should be noted that the number of the switch device TFT shown in FIG11 is not limited to two, TFT1, TFT2. In practical applications, the number of TFTs depends on the number of connected traces. Taking the mutual capacitance TP as an example, when two adjacent Rx on the left and right sides near the bending area 20a are interconnected, the number of TFTs in FIG11 should be two, namely, one TFT2 corresponding to RxC and one TFT1 corresponding to TxC.

The reverse input terminal of the operational amplifier OA is connected to the RxC of the capacitor C1, the forward input terminal is grounded, the output terminal is connected to the input terminal of the filter FILTER, the output terminal of the filter FILTER is connected to the input terminal of the variable gain amplifier VGA, the output terminal of the variable gain amplifier VGA is connected to the input terminal of the analog/digital converter ADC, and the output terminal of the analog/digital converter ADC is connected to the IC chip.

In addition, it should be noted that for an ideal operational amplifier OA, only a parallel capacitor is needed to form a charge amplifier, thereby realizing the integration of charge. However, in practical applications, in order to prevent the capacitor connected in parallel with the operational amplifier OA from saturation (caused by the bias voltage of the operational amplifier OA), a parallel resistor is also required. Based on this, referring to FIG. 11 , a resistor R1 and a capacitor C2 are also connected in parallel between the reverse input terminal and the output terminal of the operational amplifier OA, so that a charge amplifier can be formed, thereby realizing the integration of charge.

Based on the above angle detection circuit, when the IC chip sends a level signal (specifically a high level signal or a low level signal is determined by the switching characteristics of the TFT) for controlling the conduction of the TFT through the signal line Cen, the TFT is turned on, TxC will emit a pulse signal, and the potential of RxC remains unchanged, and the current charge of the capacitor C1 will change at this time; the charge of the capacitor C1 is input to the operational amplifier OA through RxC, and the corresponding voltage is obtained after integration and amplification by the operational amplifier OA and input to the filter FILTER; the filter FILTER filters the voltage to filter out the voltage that is not generated by the pulse signal emitted by TxC, and inputs the filtered voltage to the variable gain amplifier VGA; the variable gain amplifier VGA performs gain processing on the voltage, so that the voltage finally input to the analog/digital converter ADC can be increased or decreased by multiples after being processed by the analog/digital converter ADC; finally, the analog/digital converter ADC converts the capacitance value (analog signal) determined by the charge and the voltage obtained by the variable gain amplifier VGA processing into a digital signal and sends it to the IC chip for processing, thereby realizing angle detection.

In addition, it should be noted that the IC chip not only sends a level signal through the signal line Cen to control the switching devices, such as TFT1 and TFT2 in Figure 11 to turn on or off, but also sends a pulse signal through the signal line Cen after TFT1 and TFT2 are turned on, so that TxC generates a pulse signal and RxC perceives it.

Furthermore, in order to solve the problem that the charge of capacitor C1 changes due to an accidental touch, which may lead to the mistaken belief that angle detection is to be performed or affect the result of angle detection, the display touch screen can also be coupled by software, so that when the charge of capacitor C1 changes, but a touch object such as a finger or stylus is detected at the electrodes of capacitor C1 (TxC and RxC), the current charge can be not used as a basis for angle detection. In this way, the influence of accidental touch on angle detection can be avoided, thereby ensuring the stability and accuracy of angle detection.

In addition, it should be noted that, as can be seen from the above description, for the mutual capacitance TP, not only the touch mode can be supported, but also the angle detection can be supported, and the two functions have different corresponding periods and do not interfere with each other. When the angle detection is performed in the angle detection period, the corresponding angle detection circuit diagram is shown in FIG11, and when the touch detection is performed in the touch detection period, the corresponding touch mode circuit diagram can be shown in FIG12, for example.

Referring to FIG. 12 , for example, in actual applications, the touch detection circuit (such as 30 in FIG. 12 ) and the angle detection circuit (such as 40 in FIG. 12 ) share RxC and TxC. Based on FIG. 5 , this embodiment still takes TFT1 and TFT2 as being turned on at a low level as an example, so when entering the detection cycle corresponding to the touch mode, the IC chip sends a high level signal, TFT1 and TFT2 are disconnected, the angle detection circuit 40 does not work, and the touch screen chip (TPIC) sends a corresponding signal to control the switch connecting TPIC and RxC and TxC to be in a closed state (such as the dotted line state in the touch detection circuit 30 in FIG. 12 ), and the touch mode circuit 30 works at this time.

Continuing to refer to FIG12, when entering the angle detection cycle, the IC chip sends a low-level signal, TFT1 and TFT2 are turned on, and the TPIC sends a corresponding signal to control the switch connecting the TPIC and RxC and TxC to be in an open state. At this time, the touch mode circuit 30 does not work, and the angle detection circuit 40 works. For the working principle of the angle detection circuit 40, please refer to the text corresponding to FIG11, which will not be repeated here.

In addition, it should be noted that, as can be seen from the above description, for self-capacitive TP, it can not only support display mode and touch mode, but also support angle detection, and the three functions have different corresponding periods and do not interfere with each other. When performing angle detection in the angle detection period, the corresponding angle detection circuit diagram is shown in Figure 11 (40 in Figure 13), when performing display detection in the display detection period, the corresponding display mode circuit diagram can be shown in Figure 13, for example, 50, and when performing touch detection in the touch detection period, the corresponding touch mode circuit diagram can be shown in Figure 13, for example, 30.

Referring to FIG. 13 , for example, in actual application, the touch detection circuit (such as 30 in FIG. 13 ) and the angle detection circuit (such as 40 in FIG. 13 ) share RxC and TxC. Based on FIG. 7 , this embodiment still takes TFT1 and TFT2 as an example of being turned on at a low level, so when entering the detection cycle corresponding to the display mode, the IC chip sends a high level signal, TFT1 and TFT2 are disconnected, the angle detection circuit 40 does not work, the touch screen chip (TPIC) sends a corresponding signal to control the switch connecting TPIC and RxC and TxC to be in an open state, the power IC sends a corresponding signal to control the switch connecting RxC and TxC to be in a closed state (such as the dotted line state in the touch detection circuit 30 in FIG. 13 ), the touch mode circuit 30 does not work, and the display panel driver IC (Displaydriver IC, DDIC) normally outputs a signal to the circuit unit Emit that drives the pixel, and Emit transmits a corresponding signal according to the signal provided by DDIC to drive the controlled pixel Pixel to work, such as OLED on/off, that is, the display mode circuit 50 works.

Continuing to refer to FIG. 13 , illustratively, when entering the detection cycle corresponding to the touch mode, the IC chip sends a high-level signal, TFT1 and TFT2 are disconnected, the angle detection circuit 40 does not work, and the touch screen chip (TPIC) sends a corresponding signal to control the switch connecting TPIC and RxC, TxC to be in a closed state (such as the dotted line state in the touch detection circuit 30 in FIG. 13 ), and the power IC outputs ELVSS to control the switch connecting RxC, TxC to be in an open state, and the touch mode circuit 30 works.

It is understandable that for self-capacitive TP, there are some cathodes used for display as touch electrodes. Therefore, in touch mode, the cathode used for display needs to stop working for the display screen. Therefore, in this example, the switch connected to RxC and TxC is in a closed state through the power IC control, so that the power IC can provide ELVSS voltage to the display screen, so that DDIC sends a high voltage signal of Stv1 in this case, so that Emit can emit a high voltage signal, thereby driving the Pixel it controls to turn off, and then the touch mode circuit 30 can enter the working state.

It should be noted that the ELVSS mentioned in this embodiment represents the cathode potential of the OLED display.

Continuing to refer to FIG. 13 , when entering the angle detection cycle, the IC chip sends a low level signal, TFT1 and TFT2 are turned on, and the TPIC sends a corresponding signal to control the switch connecting the TPIC and RxC, TxC to be in the open state.

TPIC sends a corresponding signal to control the switch connecting RxC and TxC to be in an open state, at which time the touch mode circuit 30 does not work, and the angle detection circuit 40 works. For the working principle of the angle detection circuit 40, please refer to the text part corresponding to Figure 11, which will not be repeated here.

It should be understood that the above description is merely an example listed for a better understanding of the technical solution of this embodiment, and is not intended to be the sole limitation to this embodiment.

In order to illustrate in detail the beneficial effects brought about by the solutions for realizing angle detection provided in each embodiment of the present application, taking the folding device as a mobile phone as an example, the following is explained by comparing with related technologies.

For the related solutions by setting dual A+G devices on the mainboard, the basic principle is to calculate the angle between the two pages of the mobile phone through the direction of gravity and the angle between the coordinate axes of the two accelerometers, and the rotation angle of the angular velocity meter (gyroscope) along the Y-axis, that is, the angle formed by the inner screens on the left and right sides folded along the folding axis.

For folding screen mobile phones, the left and right planes share the Y axis in the mobile phone coordinate system, so the two coordinate systems share the XOZ plane, as shown in Figure 14. In a stationary state, the angle between the projection vector of the gravity vector g on the XOZ plane and the X1OY plane, and the angle between the projection vector of the gravity vector g on the XOZ plane and the X2OY plane are the hinge angles to be calculated. However, in a non-stationary state, there is acceleration along the non-gravity direction. At this time, the direction of the overall acceleration of the accelerometer is in the non-gravity direction. If the acceleration direction of the accelerometer is projected, the determined angle will be inaccurate. Therefore, the rotation angle along the Y axis needs to be integrated by the gyroscope, and then the detection results of the two meters are fused through the software algorithm to determine a stable and accurate angle preservation value.

Therefore, through the explanation of the principle of realizing angle detection by dual A+G devices, it can be known that this angle detection scheme must produce an angle result through the joint action of two devices. Therefore, once one of them fails, the angle detection function will fail, thereby affecting the stability of angle detection.

In addition, since the dual A+G device solution requires two A+G devices to be separately arranged on the motherboard, the implementation cost is high and is not conducive to the layout of the mobile phone motherboard.

It can be seen that the solution for realizing angle detection provided by the embodiment of the present application interconnects the wiring on both sides of the bending area of the display touch screen to form the two poles of the capacitive sensor, and then detects the size of the capacitance value to realize the detection of the folding angle of the display touch screen, without the need to integrate the angle results generated by other devices, so it has high stability.

In addition, since there is no need to set up dual A+G devices separately on the motherboard, it not only reduces the implementation cost but also facilitates the motherboard layout of folding screen devices.

In addition, it should be noted that the interconnection of the wirings on both sides of the bending region of the display touch screen in the above embodiments specifically refers to the interconnection of TP (touch screen) wirings in the display touch screen.

In addition, it should be noted that the angle detection method provided by the above embodiments implemented by the folding screen device in the actual application scenario can also be executed by a chip system included in the folding screen device, wherein the chip system may include a processor. The chip system can be coupled to the memory so that the chip system calls the computer program stored in the memory when it is running to implement the steps performed by the above folding screen device. Among them, the processor in the chip system can be an application processor or a processor other than an application processor.

In addition, an embodiment of the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed on a folding screen device, the folding screen device executes the above-mentioned related method steps to implement the angle detection method in the above-mentioned embodiment.

In addition, an embodiment of the present application also provides a computer program product. When the computer program product is run on a folding screen device, the folding screen device executes the above-mentioned related steps to implement the angle detection method in the above-mentioned embodiment.

In addition, an embodiment of the present application also provides a chip (which may also be a component or module), which may include one or more processing circuits and one or more transceiver pins; wherein the transceiver pins and the processing circuit communicate with each other through an internal connection path, and the processing circuit executes the above-mentioned related method steps to implement the angle detection method in the above-mentioned embodiment, so as to control the receiving pin to receive the signal, so as to control the transmitting pin to send the signal.

In addition, from the above description, it can be seen that the folding screen device, computer-readable storage medium, computer program product or chip provided in the embodiments of the present application are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims (16)

1. A folding screen apparatus, comprising: the display touch screen comprises a bending area, interconnection electrode areas positioned at two sides of the bending area and a display touch area positioned at two sides of the interconnection electrode areas, wherein the bending area has the functions of display, touch and bending, the interconnection electrode areas and the display touch area have the functions of display and touch, and the switching device is arranged in the bending area;

The TP wiring of the display touch area, which is close to the bending area, is interconnected through the switching device to form a capacitive sensor, and the capacitive sensor comprises an emitter electrode and a receiver electrode which are respectively positioned in the interconnected electrode area; the TP wiring of the display touch area, which is close to the bending area, is interconnected through the switching device, specifically: every two adjacent TP wires in a part or all of the TP wires in the display touch area, which are close to the bending area, are interconnected through one switching device;

The switching device is connected with the IC chip through a control signal line and is used for conducting according to a first level signal sent by the IC chip, wherein the first level signal is a level signal sent by the IC chip in an angle detection mode time period; the switch device is further used for being turned off according to a second level signal sent by the IC chip, wherein the second level signal is a level signal sent by the IC chip when the time period of the angle detection mode is not reached, and the capacitive sensor does not conduct angle detection after the switch device is turned off; the switch device comprises a grid electrode, and the grid electrode of the switch device is connected with the same control signal line;

the capacitor sensor is conducted by the switching device according to the first level signal, the emitter generates a pulse signal after the IC chip sends the pulse signal, and the potential of the receiving electrode is unchanged to generate changed charges;

the angle detection circuit is used for acquiring the charge generated by the capacitance sensor and determining the capacitance value of the capacitance sensor according to the charge;

and the IC chip is used for determining the folding angle of the display touch screen according to the capacitance value.

2. A folding screen apparatus according to claim 1, wherein the switching device comprises a thin film field effect transistor TFT.

3. The folding screen device of claim 2, wherein the display touch screen is a mutual capacitive display touch screen;

The mutual capacitance type display touch screen comprises a first TP wiring and a second TP wiring, wherein the first TP wiring is parallel to a folding shaft arranged in the bending region, and the second TP wiring is perpendicular to the folding shaft;

And each two adjacent first TP wires in a part or all of the first TP wires in the display touch area, which are close to the bending area, are interconnected through one TFT, and the grid electrodes of all TFTs are connected to the same control signal wire.

4. The folding screen device of claim 2, wherein the display touch screen is a self-contained display touch screen;

The self-contained display screen comprises a first TP wiring, and the first TP wiring is parallel to a folding shaft arranged in the bending area;

And each two adjacent first TP wires in a part or all of the first TP wires in the display touch area, which are close to the bending area, are interconnected through one TFT, and the grid electrodes of all TFTs are connected to the same control signal wire.

5. The folding screen apparatus of claim 1 wherein the angle detection circuit comprises a charge amplifier, a filter, a variable gain amplifier, and an analog-to-digital converter;

the reverse input end of the charge amplifier is connected with the receiving electrode, and the positive input end of the charge amplifier is grounded;

the input end of the filter is connected with the output end of the charge amplifier;

The input end of the variable gain amplifier is connected with the output end of the filter;

The input end of the analog-to-digital converter is connected with the output end of the variable gain amplifier, and the output end of the analog-to-digital converter is connected with the IC chip.

6. The folding screen apparatus of claim 5 wherein the charge amplifier is comprised of an operational amplifier and a capacitor;

The capacitor is connected in parallel with the inverting input end and the output end of the operational amplifier.

7. The folding screen apparatus of claim 5 wherein the charge amplifier is comprised of an operational amplifier, a capacitor and a resistor;

the capacitor is connected in parallel with the reverse input end and the output end of the operational amplifier, and the resistor is connected in parallel with two poles of the capacitor.

8. The folding screen device according to any one of claims 1 to 7, wherein the bending region is located in a non-packaging region of the display touch screen, and the display touch region is located in a packaging region of the display touch screen;

and the TP wiring of the display touch area close to the bending area is interconnected in the non-packaging area through the switching device to form the capacitive sensor.

9. An angle detection method applied to the folding screen apparatus as claimed in any one of claims 1 to 8, the method comprising:

when the angle detection mode is in a time period, the IC chip sends a first level signal, and the switching device is turned on;

The IC chip sends a pulse signal, an emitter of the capacitive sensor generates a pulse signal, and a potential of a receiving electrode of the capacitive sensor is unchanged to generate changed charges;

the angle detection circuit acquires the charge generated by the capacitance sensor and determines the capacitance value of the capacitance sensor according to the charge;

And the IC chip determines the folding angle of the display touch screen according to the capacitance value.

10. The angle detection method according to claim 9, wherein the angle detection circuit acquires the electric charge generated by the capacitance sensor, and determines the capacitance value of the capacitance sensor from the electric charge, comprising:

the capacitive sensor outputs the charge to a charge amplifier through the receiving electrode;

The charge amplifier acquires the charge generated by the capacitance sensor, and integrates the charge to obtain a first voltage corresponding to the charge;

the filter carries out filtering treatment on the first voltage to obtain a second voltage;

the variable gain amplifier performs gain processing on the second voltage to obtain a third voltage;

and the analog-to-digital converter performs analog-to-digital conversion on the capacitance value determined by the third voltage and the charge to obtain a digital signal corresponding to the capacitance value.

11. The angle detection method according to claim 9, wherein the IC chip determining the folding angle of the display touch screen according to the capacitance value includes:

and the IC chip determines the folding angle of the display touch screen according to the capacitance value and a preset mapping relation, and the mapping relation records the folding angles corresponding to different capacitance values.

12. The angle detection method according to claim 11, characterized in that the method further comprises:

And determining the relation between different capacitance values and different folding angles based on the characteristic that the capacitance values change along with the change of the folding angles, so as to obtain the preset mapping relation.

13. The angle detection method of claim 12, wherein the capacitance value is inversely proportional to the folding angle.

14. The angle detection method according to any one of claims 9 to 13, characterized in that the method further comprises:

And when the time period of the angle detection mode is not reached, the IC chip sends a second level signal, and the switching device is turned off, so that the display touch screen enters a touch detection mode or a display mode.

15. The angle detection method according to any one of claims 9 to 13, characterized in that the method further comprises:

After the switching device is conducted and the IC chip sends a pulse signal, if an object is detected to touch the area where the emitter and the receiving electrode are located in the display touch screen;

and not processing the current charge of the capacitive sensor.

16. A computer readable storage medium comprising a computer program which, when run on a folding screen device, causes the folding screen device to perform the angle detection method of any one of claims 9 to 15.