Capacitance detection method for foldable screen, touch chip and electronic device

Abstract

Embodiments of the present application provide a capacitance detection method for a foldable screen, a touch chip and an electronic device. A touch panel of a foldable screen comprises a bendable area extending along a first direction and a first non-bendable area and a second non-bendable area which are distributed on two sides of the bendable area along a second direction, wherein the second direction is perpendicular to the first direction, and the first non-bendable area and the second non-bendable area both comprise a plurality of first detection electrodes parallel to the first direction. The method comprises: inputting a first driving signal to a first specific detection electrode, wherein the first specific detection electrode is a first detection electrode close to the bendable area in the first non-bendable area; acquiring, from a second specific detection electrode, a first sensing signal in response to the first driving signal, wherein the second specific detection electrode is a first detection electrode close to the bendable area in the second non-bendable area; processing the acquired first sensing signal to obtain first detection data of the second specific detection electrode; and on the basis of the first detection data, determining the open / closed state of the foldable screen.

Description

Capacitive detection method, touch chip and electronic device for folding screen Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and in particular to a capacitance detection method, a touch chip, and an electronic device for a folding screen. Background Art

[0002] For electronic devices such as mobile phones with flexible folding screens, there is a need to implement functions such as auxiliary user interface (UI) and opening and closing detection through rotation. Therefore, how to detect the opening and closing status of the folding screen of the electronic device has become a problem that needs to be solved.

[0003] Summary of the Invention

[0004] In view of this, one of the technical problems solved by the embodiments of the present application is to provide a capacitance detection method, a touch chip and an electronic device for a folding screen, which can effectively detect the opening and closing state of the folding screen of the electronic device.

[0005] In a first aspect, a capacitance detection method for a foldable screen is provided, wherein the touch panel of the foldable screen includes a bending region extending along a first direction and a first non-bending region and a second non-bending region distributed on both sides of the bending region along a second direction, wherein the second direction is perpendicular to the first direction, and the first non-bending region and the second non-bending region each include a plurality of first detection electrodes parallel to the first direction. The method includes:

[0006] Inputting a first driving signal to a first specific detection electrode, where the first specific detection electrode is a first detection electrode in the first non-bending area close to the bending area;

[0007] obtaining a first sensing signal in response to the first driving signal from a second specific detection electrode, where the second specific detection electrode is a first detection electrode in the second non-bending region close to the bending region;

[0008] processing the acquired first sensing signal to obtain first detection data of the second specific detection electrode;

[0009] The opening and closing state of the folding screen is determined according to the first detection data of the second specific detection electrode.

[0010] Since the distance between the first non-bending area and the second non-bending area of ​​the touch panel of the folding screen changes when the folding screen changes from a closed state to an unfolded state or from an unfolded state to a closed state, the distance between the multiple first detection electrodes in the first non-bending area and the second non-bending area changes, and the size of the capacitance between the multiple first detection electrodes in the first non-bending area and the second non-bending area changes. In particular, the size of the capacitance between the first detection electrode (i.e., the first specific detection electrode) close to the bending area in the first non-bending area and the first detection electrode (i.e., the second specific detection electrode) close to the bending area in the second non-bending area changes more significantly. In the technical solution provided by the present application, since when the first drive signal is input to the first specific detection electrode, the first drive signal is coupled to the second specific detection electrode through the capacitance between the first specific detection electrode and the second specific detection electrode, the first sensing signal obtained from the second specific detection in response to the first drive signal can indicate the size of the capacitance between the first specific detection electrode and the second specific detection electrode, and then according to the first detection data obtained by processing the first sensing signal, the opening and closing state of the folding screen can be effectively determined.

[0011] In a second aspect, a touch chip is provided, suitable for a foldable screen. The touch panel of the foldable screen includes a bending region extending along a first direction and a first non-bending region and a second non-bending region distributed on both sides of the bending region along a second direction. The second direction is perpendicular to the first direction. The first non-bending region and the second non-bending region each include a plurality of first detection electrodes parallel to the first direction. The touch chip includes:

[0012] a driving module, configured to input a first driving signal to a first specific detection electrode, wherein the first specific detection electrode is a first detection electrode in the first non-bending area close to the bending area;

[0013] an acquisition module, configured to acquire a first sensing signal in response to the first driving signal from a second specific detection electrode, where the second specific detection electrode is a first detection electrode in the second non-bending region close to the bending region; and

[0014] a processing module, configured to process the acquired first sensing signal to obtain first detection data of the second specific detection electrode;

[0015] The processing module is further used to determine the opening and closing state of the folding screen based on the first detection data of the second specific detection electrode.

[0016] According to a third aspect, an electronic device is provided, including:

[0017] Folding screens; and

[0018] A touch chip is used to execute the capacitance detection method for a folding screen provided in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, some specific embodiments of the present application will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0020] FIG1 is a method for detecting the opening and closing state of a folding screen provided in the related art;

[0021] FIG2 is a schematic flow chart of a capacitance detection method for a foldable screen provided in an embodiment of the present application;

[0022] FIG3 is a schematic structural diagram of a touch panel of a foldable screen provided in an embodiment of the present application;

[0023] FIG4 is a schematic structural diagram of a touch panel of a foldable screen provided in an embodiment of the present application;

[0024] FIG5 is a schematic diagram of a detection device for acquiring first detection data provided by an embodiment of the present application;

[0025] FIG6 shows a trend diagram of first detection data of three second specific detection electrodes in the touch panel shown in FIG3 as the folding angle changes;

[0026] FIG7 is a schematic diagram showing changes in the first detection data of the three second specific detection electrodes shown in FIG3 under different coding dot configurations;

[0027] FIG8 is a schematic diagram showing capacitances between three first specific detection electrodes and symmetrically located second specific detection electrodes in the touch panel shown in FIG3 ;

[0028] FIG9 shows a schematic flow chart of a capacitance detection method for a foldable screen provided in an embodiment of the present application;

[0029] FIG10 shows a schematic signal waveform of a second driving signal applied to a first detection electrode during a touch detection period provided by an embodiment of the present application;

[0030] FIG11 shows a schematic signal waveform of a second sensing signal obtained from a second detection electrode during touch detection according to an embodiment of the present application;

[0031] FIG12 is a schematic flow chart of a capacitance detection method for a folding screen provided in an embodiment of the present application;

[0032] FIG13 shows a schematic structural diagram of a touch control chip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 should fall within the scope of protection of the embodiments of the present application.

[0034] For electronic devices such as mobile phones with flexible folding screens, there is a demand for functions such as auxiliary user interface (UI) and opening and closing detection through rotation. In the related art, as shown in Figure 1, it is usually necessary to set Hall devices 10a to 10c in the electronic device to detect the opening and closing state of the folding screen. However, when the user uses an electronic device with a folding screen in a magnetic field environment, the magnetic field environment may interfere with the Hall devices 10a to 10c, resulting in inaccurate detection results of the opening and closing state, affecting the user experience. For example, when an electronic device is equipped with a stylus device, a magnet assembly used in conjunction with the stylus device is usually provided inside the electronic device. The magnet assembly will interfere with the Hall devices 10a to 10c, thereby resulting in inaccurate detection results of the opening and closing state, affecting the user experience. In addition, the Hall devices 10a to 10c also take up space inside the electronic device and increase the cost of the electronic device.

[0035] To this end, the present application provides a capacitance detection method for a folding screen, which aims to solve the problem of how to effectively detect the opening and closing state of the folding screen. It has the advantages of high accuracy and not being easily affected by the external environment. It does not take up space inside the electronic device and does not increase additional costs.

[0036] Figure 1 shows a capacitance detection method for a foldable screen provided by an embodiment of the present application. The method is performed by a touch chip of a touch panel of an electronic device, which is also called a touch controller or touch panel integrated circuit (TPIC). A foldable screen may include, for example, a touch panel and a display panel. Typically, the display panel is located above the touch panel.

[0037] The touch panel may be the touch panel 200 shown in Figures 3 and 4. The touch panel 200 includes a bending region 210 extending along a first direction X and a first non-bending region 220a and a second non-bending region 220b distributed on both sides of the bending region 210 along a second direction Y perpendicular to the first direction X.

[0038] Touch panel 200 includes a plurality of first detection electrodes, also known as first detection channels, parallel to a first direction X. The plurality of first detection electrodes are evenly distributed along a second direction Y in a first non-bending region 220a and a second non-bending region 220b. Touch panel 200 also includes a plurality of second detection electrodes, also known as second detection channels, parallel to the second direction Y. The plurality of second detection electrodes are perpendicular to the plurality of first detection electrodes.

[0039] In one implementation, the first detection electrode is a drive (TX) electrode, and the second detection electrode is a sense (RX) electrode. For example, as shown in FIG3 , the touch panel 200 includes 38 first detection electrodes, namely TX0 to TX37. The first non-bending area 220a includes 19 first detection electrodes TX0 to TX18, and the second non-bending area 220b includes 19 first detection electrodes TX19 to TX37. It should be understood that the touch panel 200 may have other numbers of first detection electrodes. The touch panel 200 also includes a plurality of second detection electrodes (not shown), namely RX electrodes, arranged along the direction of the arrow RX. During touch detection of the touch panel, a drive signal can be applied to the first detection electrodes (i.e., TX0, TX1 to TX37) in the touch panel 200, and a sensing signal in response to the drive signal is received from the second detection electrode coupled to the first detection electrode. The sensing signal changes with the touch or proximity of an object such as a finger or pen. Based on the sensing signal, the touch coordinates and the presence / absence of the touch can be detected.

[0040] In addition, in this implementation, at least one first detection electrode close to the bending area 210 among the multiple first detection electrodes in the second non-bending area 220b can be converted into an RX electrode to be used in conjunction with at least one first detection electrode close to the bending area 210 in the first non-bending area 220a, thereby realizing the detection of the opening and closing state of the folding screen during the detection of the opening and closing state of the folding screen.

[0041] In another implementation, the first detection electrodes are sensing (RX) electrodes, and the second detection electrodes are driving (TX) electrodes. As shown in FIG4 , the touch panel 200 includes 38 first detection electrodes, namely, RX0 to RX37. The first non-bending region 220a includes 19 first detection electrodes, RX0 to RX18, and the second non-bending region 220b includes 19 first detection electrodes, RX19 to RX37. The touch panel 200 may have other numbers of first detection electrodes. The touch panel 200 also includes a plurality of second detection electrodes (not shown), namely, TX electrodes, arranged along the direction of arrow TX. During touch detection by the touch panel, a drive signal may be applied to the second detection electrodes in the touch panel 200, and a sensing signal in response to the drive signal is received from the first detection electrodes (i.e., RX0, RX1 to RX37) coupled to the second detection electrodes. The sensing signal varies with the touch or proximity of an object, such as a finger or pen. Touch coordinates and the presence / absence of a touch can be detected based on the sensing signal.

[0042] In addition, in this implementation, at least one first detection electrode close to the bending area 210 among the multiple first detection electrodes in the first non-bending area 220a can be converted into a Tx electrode to be used in conjunction with at least one second detection electrode close to the bending area 210 in the second non-bending area 220b, thereby realizing the detection of the opening and closing state of the folding screen during the detection of the opening and closing state of the folding screen.

[0043] The capacitance detection method for a folding screen is described in detail below in conjunction with Figures 2 to 8. As shown in Figure 2, the method includes some or all of the following steps.

[0044] In S102 , a first driving signal is input to a first specific detection electrode of the touch panel.

[0045] In S104 , a first sensing signal in response to the first driving signal is acquired from the second specific detection electrode.

[0046] In S106 , the first sensing signal of the second specific detection electrode is processed to obtain first detection data of the second specific detection electrode.

[0047] In S108 , the opening and closing state of the folding screen is determined according to the first detection data of the second specific detection electrode.

[0048] In this embodiment, the touch panel is a touch panel 200 as shown in FIG3 or 4. The first specific detection electrode is the first detection electrode close to the bending area 210 among the multiple first detection electrodes in the first non-bending area 220a. The second specific detection electrode is the first detection electrode close to the bending area 210 among the multiple first detection electrodes in the second non-bending area 220b. The first sensing signal is the sensing signal output from the second specific detection electrode when coding the first specific detection electrode. Coding refers to the process of inputting a first drive signal to the first specific detection electrode. During the coding process, the first drive signal input to the first specific detection electrode can be coupled to the second specific detection electrode through the capacitance between the first specific detection electrode and the second specific detection electrode, that is, a first sensing signal in response to the first drive signal can be obtained from the second specific detection electrode, and the first sensing signal is used to indicate the size of the capacitance between the first specific detection electrode and the second specific detection electrode.

[0049] Taking the touch panel 200 shown in Figure 3 as an example, the first specific detection electrode is the TX electrode in the first non-bending area 220a close to the bending area 210. The second specific detection electrode is the TX electrode in the second non-bending area 220b close to the bending area 210. During the opening and closing detection of the folding screen, the TX electrode in the second non-bending area 220b serving as the second specific detection electrode can be converted into an RX electrode. Therefore, when a first drive signal is input to the TX electrode in the first non-bending area 220a serving as the first specific detection electrode, a first sensing signal in response to the first drive signal can be obtained from the TX electrode in the second non-bending area 220b serving as the second specific detection electrode.

[0050] Taking the touch panel 200 shown in Figure 4 as an example, the first specific detection electrode is the RX electrode in the first non-bending area 220a close to the bending area 210. The second specific detection electrode is the RX electrode in the second non-bending area 220b close to the bending area 210. For the touch panel 200 shown in Figure 3, during the opening and closing detection of the folding screen, the Rx electrode in the first non-bending area 220a serving as the first specific detection electrode can be converted into a Tx electrode. Thus, a first drive signal can be input to the Rx electrode in the first non-bending area 220a serving as the first specific detection electrode, and a first sensing signal in response to the first drive signal can be obtained from the Rx electrode in the second non-bending area 220b serving as the second specific detection electrode.

[0051] In one implementation of the present application, when a first driving signal is input to the first specific detection electrode and a first sensing signal is obtained from the second specific detection electrode, the other first detection electrodes except the first specific detection electrode among the multiple first detection electrodes in the first non-bending area 210a are grounded or suspended to avoid interfering with the opening and closing detection of the folding screen.

[0052] In one implementation of the present application, when a first driving signal is input to the first specific detection electrode and a first sensing signal is obtained from the second specific detection electrode, the other first detection electrodes among the multiple first detection electrodes in the second non-bending area 210b except the second specific detection electrode are grounded or suspended to avoid interfering with the opening and closing detection of the folding screen.

[0053] In an embodiment of the present application, the signal waveform of the first drive signal is different from the signal waveform of the first sensing signal. The difference in signal waveforms at least includes a difference in the amplitude of the signal waveform. For example, the first drive signal is a sine wave signal, a square wave signal, a triangle wave signal, etc. with a specific drive frequency, which is usually controlled by the touch chip. The first sensing signal is a signal of the first drive signal coupled by capacitance, and its amplitude is reduced relative to the first drive signal. In addition, since the first sensing signal is a signal of the first drive signal coupled by capacitance, in some embodiments, the first sensing signal has a certain phase offset relative to the first drive signal. In addition, the first sensing signal may be affected by interference from the display screen and interference coupled when other modules inside the touch panel are working, so that the first sensing signal is also coupled with some noise. Accordingly, the difference in signal waveforms can also include different amplitudes and phases of the signal waveforms.

[0054] After obtaining the first sensing signal of the second specific detection electrode, it is necessary to process the first sensing signal to generate the first detection data of the second specific detection electrode, so that the subsequent digital processing circuit can determine the opening and closing state of the folding screen based on the first detection data. As shown in Figure 5, processing the first sensing signal of the second specific detection electrode may include: using a programmable gain amplifier (PGA) circuit to extract and amplify the first sensing signal, and using an analog to digital converter (ADC) circuit to perform analog-to-digital conversion on the amplified first sensing signal. It should be understood that in other implementations, processing the first sensing signal of the second specific detection electrode may also include using an anti-aliasing filter to filter the amplified first sensing signal before the ADC circuit performs analog-to-digital conversion on the amplified first sensing signal.

[0055] Because when the folding angle of the folding screen changes, the distance between the first non-bending area 220a and the second non-bending area 220b changes, the distance between the first specific detection electrode in the first non-bending area 220a and the second specific detection electrode in the second non-bending area 220b changes, thereby causing the capacitance between the first specific detection electrode and the second specific detection electrode to change. In an embodiment of the present application, when a first drive signal is input to the first specific detection electrode, the first drive signal can be capacitively coupled to the second specific detection electrode. Therefore, the first sensing signal obtained from the second specific detection electrode in response to the first drive signal can indicate the size of the capacitance between the first specific detection electrode and the second specific detection electrode. The first detection data obtained by processing the first sensing signal can effectively and accurately detect the opening and closing state of the folding screen. In addition, this detection method has the advantage of not being easily affected by the external environment, and does not occupy space inside the electronic device, and does not increase additional costs.

[0056] In one implementation of the present application, the second specific detection electrode is a first detection electrode in the second non-bending area 220b that is symmetrically arranged with the first specific detection electrode along the bending area 210. That is, the second specific detection electrode and the first specific detection electrode are symmetrically arranged along the bending area 210. Because when the folding angle of the folding screen is fixed, the distance between the symmetrically arranged first specific detection electrode and the second specific detection electrode is closer than that between the asymmetrically arranged first specific detection electrode and the second specific detection electrode, the capacitance between the symmetrically arranged first specific detection electrode and the second specific detection electrode will be larger. When the first driving signal is input to the first specific detection electrode, the first sensing signal obtained from the symmetrically arranged second specific detection electrode is stronger and has a higher signal-to-noise ratio, so that the first detection data obtained by processing the first sensing signal can more effectively and accurately detect the opening and closing state of the folding screen.

[0057] In one implementation of the present application, the number of both the first specific detection electrode and the second specific detection electrode is one. The first specific detection electrode can be any first detection electrode in the first non-bending region 220a that is close to the bending region 210. Correspondingly, the second specific detection electrode is a first detection electrode in the second non-bending region 220b that is close to the bending region 210. Preferably, the second specific detection electrode is a first detection electrode in the second non-bending region 220b that is symmetrical to the first specific detection electrode along the bending region 210.

[0058] Since the closer the first specific detection electrode in the first non-bending area 220a is to the bending area 210, the smaller the distance between the first specific detection electrode and the second specific detection electrode symmetrical along the bending area, correspondingly, the greater the capacitance between the two. When the folding angle changes, the capacitance between the two also changes more significantly. Accordingly, the change in the first detection data from the second specific detection electrode is more obvious, thereby more accurately and reliably detecting the opening and closing state of the folding screen. Therefore, in one implementation of the present application, the first specific detection electrode is the first detection electrode closest to the bending area 210 among the multiple first detection electrodes in the first non-bending area 220a. Correspondingly, the second specific detection electrode is the first detection electrode closest to the bending area 210 among the multiple first detection electrodes in the second non-bending area 220b. For example, the first specific detection electrode is TX18 in Figure 3, and the second specific detection electrode is TX19 in Figure 3. For another example, the first specific detection electrode is RX18 in Figure 4, and the second specific detection electrode is RX19 in Figure 4.

[0059] When there is only one first specific detection electrode and one corresponding second specific detection electrode in the touch panel 200, if one of the first specific detection electrode and the corresponding second specific detection electrode fails or fails, the touch panel will be unable to detect the opening and closing state of the folding screen. To this end, in another implementation, the number of first specific detection electrodes and second specific detection electrodes is a positive integer greater than or equal to 2. That is, there are at least two first specific detection electrodes and corresponding second specific detection electrodes in the touch panel to improve the reliability of the detection of the opening and closing state of the folding screen. For example, in the touch panel 200 shown in Figure 3, there are three first specific detection electrodes Tx15, Tx16 and Tx17, and the corresponding three second specific detection electrodes are Tx20, Tx21 and Tx22.

[0060] In order to ensure the reliability of the opening and closing calculation and take the calculation efficiency into consideration, preferably, the number of the first specific detection electrodes and the second specific detection electrodes is 2 or 3.

[0061] The following describes a process of acquiring first detection data of N second specific detection electrodes when the number of the first specific detection electrodes and the second specific detection electrodes is N and N is a positive integer greater than or equal to 2 (ie, steps S102 to S106 ).

[0062] In one implementation of the present application, step S102 includes: simultaneously inputting a first drive signal to N first specific detection electrodes at N moments within an opening / closing detection cycle. Accordingly, step S104 includes: for each of the N second specific detection electrodes, obtaining a sensing signal at the second specific detection electrode when the first drive signal is simultaneously input to the N first specific detection electrodes at each moment, as the first sensing signal of the second specific detection electrode. That is, the first sensing signal of each second specific detection electrode is the result of the combined effect of the first drive signals input to the N first specific detection electrodes at each moment. It should be understood that since the first drive signal is input to the N first specific detection electrodes at N moments within an opening / closing detection cycle, N first sensing signals can be obtained for each second specific detection electrode within the opening / closing detection cycle. After obtaining the first sensing signals of the N second specific detection electrodes in the above manner, the first sensing signals of the N second specific detection electrodes are processed in step 106 to obtain first detection data for the N second specific detection electrodes. The above-mentioned processing may include, for example, signal extraction through a PGA circuit, analog-to-digital conversion through an ADC circuit, and demodulation through a demodulation circuit.

[0063] Taking the touch panel shown in Figure 3 as an example, the N first specific detection electrodes are TX15, TX16, and TX17, and the N second specific detection electrodes are TX20, TX21, and TX22. At three times T1, T2, and T3 in an opening and closing detection cycle, a first drive signal is simultaneously input to the three first specific detection electrodes TX17, TX16, and TX15. At time T1, first sensing signals Z11, Z12, and Z13 are respectively obtained from the N second specific detection electrodes TX20, TX21, and TX22. Z11 is the first sensing signal of TX20 caused by the first drive signal input to the three first specific detection electrodes TX15, TX16, and TX17. Similarly, Z12 is the first sensing signal of TX21 caused by the first drive signal input to the three first specific detection electrodes TX15, TX16, and TX17. Z13 is the first sensing signal of TX22 caused by the first drive signal input to the three first specific detection electrodes TX15, TX16, and TX17. Similarly, at time T2, first sensing signals Z21, Z22, and Z23 can be obtained from the three second specific detection electrodes TX20, TX21, and TX22, respectively. At time T3, first sensing signals Z31, Z32, and Z33 can be obtained from the three second specific detection electrodes TX20, TX21, and TX22, respectively. By processing the first sensing signals Z11 to Z33 obtained from the N second specific detection electrodes, first detection data Rawdata(1) to Rawdata(9) of the N second specific detection electrodes can be obtained accordingly, where Rawdata(1) is used to indicate the size of the capacitance between TX17 and TX20, Rawdata(2) is used to indicate the size of the capacitance between TX17 and TX21, and Rawdata(3) is used to indicate the size of the capacitance between TX17 and TX22. Rawadta (4) indicates the capacitance between TX16 and TX20, Rawdata (5) indicates the capacitance between TX16 and TX21, and Rawdata (6) indicates the capacitance between TX16 and TX22. Rawdata (7) indicates the capacitance between TX15 and TX20, Rawdata (8) indicates the capacitance between TX15 and TX21, and Rawdata (9) indicates the capacitance between TX15 and TX22.

[0064] In the implementation of the present application, since each first sensing signal is the common result of the first drive signal input to N first specific detection electrodes at the same time, the intensity of the first sensing signal obtained from the N second specific detection electrodes is higher, and the corresponding first detection data value is larger. When the opening and closing state of the folding screen changes, the change of these first detection data is more obvious, thereby improving the accuracy and reliability of the detection of the opening and closing state of the folding screen. It should be understood that in the implementation of the present application, each first sensing signal is the common result of the first drive signal input to N first specific detection electrodes at the same time. In order to be able to obtain the detection data indicating the size of the capacitance between each second specific detection electrode and each first specific detection electrode through orthogonal demodulation processing, it is necessary to apply N first drive signals to each first specific detection electrode within one opening and closing detection cycle. That is, within one opening and closing detection cycle, it is necessary to input the first drive signal to the N first specific detection electrodes at N moments at the same time.

[0065] In another implementation, step S102 includes sequentially inputting a first drive signal to N first specific detection electrodes within an opening / closing detection cycle. Accordingly, step S104 includes obtaining, for each of the N second specific detection electrodes, a sensing signal from the second specific detection electrode when the first drive signal is input to the first specific detection electrode, as the first sensing signal of the second specific detection electrode. It should be understood that since a first sensing signal can be obtained from each first specific detection electrode when the first drive signal is input to the first specific detection electrode, N first sensing signals can be obtained for each second specific detection electrode within an opening / closing detection cycle. After obtaining the first sensing signals of the N second specific detection electrodes in the above manner, the first sensing signals of the N second specific detection electrodes are processed in step 106 to obtain first detection data for the N second specific detection electrodes. This processing may include signal quantity extraction using a PGA circuit and analog-to-digital conversion using an ADC circuit.

[0066] Similarly, taking the touch panel 200 shown in FIG3 as an example, during an opening and closing detection cycle, a first drive signal is sequentially applied to the N first specific detection electrodes TX17, TX16, and TX15. When the first drive signal is applied to TX17, first sensing signals S11, S12, and S13 are respectively obtained from the N second specific detection electrodes TX20, TX21, and TX22, where S11 indicates the capacitance between TX17 and TX20, S12 indicates the capacitance between TX17 and TX21, and S13 indicates the capacitance between TX17 and TX22. When the first drive signal is applied to TX16, first sensing signals S21, S22, and S23 are respectively obtained from the N second specific detection electrodes TX20, TX21, and TX22, where S21 indicates the capacitance between TX16 and TX20, S22 indicates the capacitance between TX16 and TX21, and S23 indicates the capacitance between TX16 and TX22. When a first drive signal is applied to TX15, the N second specific detection electrodes TX20, TX21, and TX22 respectively output first sensing signals S31, S32, and S33, where S31 indicates the capacitance between TX15 and TX20, S32 indicates the capacitance between TX15 and TX21, and S33 indicates the capacitance between TX15 and TX22. The first sensing signals S11 to S33 obtained from the three second specific detection electrodes are processed separately to obtain first detection data Rawdata (1) to Rawdata (9) corresponding to the three second specific detection electrodes.

[0067] Compared with the implementation method of inputting driving signals to N first specific detection electrodes at the same time, the calculation process of the first detection data in the implementation method of the present application can be simpler.

[0068] The following describes a process of determining the opening and closing state of the folding screen based on the first detection data of the N second specific detection electrodes (ie, step S108 ).

[0069] When the number N of the first specific detection electrode and the corresponding second specific detection electrode is equal to 1, the first sensing signal of the second specific detection electrode obtained is used to indicate the size of the capacitance between the first specific detection electrode and the second specific detection electrode. Correspondingly, the first detection data of the second specific detection electrode obtained by processing the first sensing signal is also used to indicate the size of the capacitance between the first specific detection electrode and the second specific detection electrode. To this end, in one implementation, step S108 includes: determining the opening and closing state of the folding screen based on the comparison result of the first detection data of the second specific detection electrode and the first detection threshold. Specifically, when the first detection data is greater than the first detection threshold, it is determined that the folding screen is in a folded state, and when the first detection data is less than the first detection threshold, it is determined that the folding screen is in an unfolded state.

[0070] When the number N of first specific detection electrodes and corresponding second specific detection electrodes is a positive integer greater than or equal to 2, the first detection data of the N second specific detection electrodes includes detection data for indicating the size of the capacitance between the second specific detection electrode and the symmetrical first specific detection electrode (hereinafter referred to as the third detection data), and also includes detection data for indicating the size of the mutual capacitance between the second specific detection electrode and the asymmetric first specific detection electrode (hereinafter referred to as the fourth detection data).

[0071] Since the distance between the first specific detection electrode and the second specific detection electrode, which are symmetrical to each other, is relatively smaller, when the folding angle of the folding screen changes, the change in capacitance between the first specific detection electrode and the second specific detection electrode, which are symmetrical to each other, is the most obvious, and therefore, the change in the third detection data in the first detection data is the most obvious. FIG6 shows a trend diagram of the first detection data of the three second specific detection electrodes in the touch panel described in FIG3 as the folding angle changes. As shown in FIG6, as the folding angle of the folding screen changes, the first detection data of the three second specific detection electrodes in the touch panel also changes. When the folding screen is folded to the critical folding angle, the changes in the third detection data Rawdata (1), Rawdata (5) and Rawdata (9) in the first detection data are more obvious, wherein Rawdata (1), Rawdata (5) and Rawdata (9) are used to indicate the size of the capacitance between TX17 and TX20, the size of the capacitance between TX16 and TX21, and the size of the capacitance between TX15 and TX22 in FIG7, respectively.

[0072] Since the opening and closing state of the folding screen can be determined more accurately and reliably based on the third detection data with obvious changes, in one implementation of the present application, step S108 includes: determining the opening and closing state of the folding screen based on the comparison result of the third detection data of N second specific detection electrodes with the first detection threshold.

[0073] The first detection threshold is used to indicate the maximum value of the capacitance between the first specific detection electrode and the second specific detection electrode when the folding screen is determined to be in the unfolded state. The first detection threshold can be predetermined based on experiments. The first detection threshold can be determined based on parameters such as the number of coding points and the critical folding angle.

[0074] Coding is the process of inputting a first drive signal to a first specific detection electrode in a touch panel. The first drive signal is composed of a signal waveform having a specific signal frequency. The number of coding points is used to indicate the number of signal waveforms contained in the first drive signal. The more coding points there are, the longer the duration of the first drive signal will be, and the larger the first detection data of the second specific detection signal will be. As shown in Figure 7, the more coding points there are, the larger the first detection data Rawdata of the three second specific detection electrodes in Figure 3 will be. In order to ensure the accuracy of the detection, the first detection threshold can be set to a larger value.

[0075] The critical folding angle is the maximum angle at which the folding screen is determined to be in the folded state. The smaller the critical folding angle is set, the smaller the distance between the first non-bending area 220a and the second non-bending area 220b is required to be when the folding screen is determined to be in the folded state. This results in a larger first detection data value required of the second specific detection electrode when the folding screen is determined to be in the folded state. To ensure detection accuracy, the first detection threshold needs to be set accordingly.

[0076] In one implementation of the present application, if any one of the third detection data of the N second specific detection electrodes is greater than the first detection threshold, the folding screen is determined to be in the closed state. Taking Figure 6 as an example, when any one of the third detection data Rawdata(1), Rawdata(5) and Rawdata(9) is greater than the first detection threshold RefRawdata, the folding screen is determined to be in the closed state. This avoids the problem of inaccurate detection of the opening and closing state of the folding screen due to a failure or failure of a certain first specific detection electrode, thereby improving the reliability and accuracy of the detection of the opening and closing state of the folding screen.

[0077] In another implementation, if the third detection data of the N second specific detection electrodes are all less than or equal to the first detection threshold, the foldable screen is determined to be in the unfolded state. This avoids the problem of inaccurate detection of the foldable screen's open or closed state due to a malfunction or failure of a first specific detection electrode, thereby improving the reliability and accuracy of detection.

[0078] In addition, there may be certain differences between different folding screens. For example, for the same folding angle, the first detection data of the second specific detection electrodes corresponding to different folding screens may be different. In some cases, directly comparing the first detection data of the second specific detection electrode (especially the third detection data in the first detection data) with the first preset threshold determined by the experiment to determine the opening and closing state of the folding screen may be erroneous. In order to further improve the accuracy of the detection, in another implementation of the present application, step S108 includes: subtracting the third detection data of the N second specific detection electrodes from the minimum data in the fourth detection data to obtain N difference values; and determining the opening and closing state of the folding screen based on the comparison results of the N difference values ​​with the second detection threshold.

[0079] The second detection threshold indicates the maximum value that can be achieved by the difference between the maximum capacitance and the minimum capacitance between the N first specific detection electrodes and the N second specific detection electrodes when the foldable screen is determined to be in the unfolded state. Similar to the first detection threshold, the second detection threshold can also be determined based on parameters such as the number of coding points and the critical folding angle.

[0080] Among them, the minimum data among the N fourth detection data is usually detection data for indicating the size of the mutual capacitance between the first specific detection electrode in the first non-bending area that is farthest from the bending area and the second specific detection electrode in the second non-bending area that is closest to the bending area, or detection data for indicating the size of the mutual capacitance between the first specific detection electrode in the first non-bending area that is closest to the bending area and the second specific detection electrode in the second non-bending area that is farthest from the bending area.

[0081] Taking the touch panel shown in FIG3 as an example, there are three third detection data and six fourth detection data, wherein the three third detection data are Rawdata(1), Rawdata(5) and Rawdata(9), and the six fourth detection data are Rawdata(2), Rawdata(3), Rawdata(4), Rawdata(6), Rawdata(7) and Rawdata(8). Among them, the smallest fourth detection data are Rawdata(3) and Rawdata(7), which are used to indicate the size of the capacitance between the first specific detection electrode TX15 in the first non-bending area 220a that is farthest from the bending area 210 and the second specific detection electrode TX20 in the second non-bending area 220b that is closest to the bending area 210, and the size of the capacitance between the first specific detection electrode TX17 in the first non-bending area 220a that is closest to the bending area 210 and the second specific detection electrode TX22 in the second non-bending area 220b that is farthest from the bending area 210. The opening and closing state of the folding screen can be determined based on the comparison results of the difference between Rawdata(1) and Rawdata(3), the difference between Rawdata(5) and Rawdata(3), and the difference between Rawdata(9) and Rawdata(3) with the second detection threshold RefRawdata1.

[0082] Because the first detection data obtained from the second specific detection electrode for the same folding screen has a consistent trend (for example, the first detection data is generally larger or smaller than that of other folding screens), the difference between the third detection data and the minimum fourth detection data in the first detection data obtained from the second specific detection electrode is used to determine the open or closed state of the folding screen. This can eliminate detection errors caused by differences between different folding screens and improve detection accuracy.

[0083] Specifically, in one implementation, if any one of the N differences is greater than a second detection threshold, the foldable screen is determined to be in the closed state. If all N differences are less than or equal to the second detection threshold, the foldable screen is determined to be in the unfolded state. This avoids the problem of inaccurate detection of the foldable screen's open or closed state due to a malfunction or failure of a specific first detection electrode, thereby improving the reliability and accuracy of foldable screen open or closed state detection.

[0084] Based on the embodiment shown in FIG2 , in another embodiment of the present application, as shown in FIG9 , the detection method for a folding screen further includes part or all of the following steps.

[0085] In S202, a second driving signal is input to a plurality of first detection electrodes in the first non-bending area and the second non-bending area;

[0086] In S204 , second sensing signals in response to the second driving signal are acquired from the plurality of second detection electrodes.

[0087] In S206, the second sensing signals of the plurality of second detection electrodes are processed to obtain second detection data of the plurality of second detection electrodes;

[0088] In S208 , a touch detection result is determined according to the second detection data of the plurality of second detection electrodes.

[0089] The plurality of first detection electrodes in the touch panel include a plurality of first detection electrodes in the first non-bending area 220 a and a plurality of second detection electrodes in the second non-bending area 220 b .

[0090] In one implementation, step S202 may include sequentially inputting a second drive signal to M first detection electrodes during a touch detection cycle. Taking the touch panel shown in FIG3 as an example, the second drive signal is sequentially inputted to 38 first detection electrodes TX0 to TX37 during a touch detection cycle. Since each first detection electrode generates a corresponding sensing signal (hereinafter referred to as a second sensing signal) at the multiple second detection electrodes intersecting therewith when the drive signal is inputted thereto, step S204 may include, for each first detection electrode inputted with the second drive signal, obtaining a second sensing signal from each of the multiple second detection electrodes in response to the second drive signal. Each second sensing signal indicates the magnitude of the mutual capacitance between the corresponding second detection electrode and a first detection electrode. After obtaining the second sensing signals from the multiple second detection electrodes, the second sensing signals from the multiple second detection electrodes are processed in step 206 to obtain second detection data for the multiple second detection electrodes. Each second detection data indicates the magnitude of the mutual capacitance between the corresponding second detection electrode and a first detection electrode. This processing may, for example, include signal extraction via a PGA circuit and analog-to-digital conversion via an ADC circuit.

[0091] In another implementation, step 202 may include: simultaneously inputting a second drive signal to multiple first detection electrodes at multiple moments within a touch detection cycle. That is, the second drive signal is simultaneously input to the multiple first detection electrodes multiple times within a touch detection cycle. Accordingly, step S204 may include: obtaining second sensing signals from the multiple second detection electrodes in response to the second drive signal simultaneously input to the multiple first detection electrodes at each moment. That is, the second sensing signals are the result of the combined effect of the second drive signal simultaneously input to the multiple first detection electrodes at each moment. After obtaining the second sensing signals from the multiple second detection electrodes, the second sensing signals from the multiple second detection electrodes are processed in step 206 to obtain second detection data for the multiple second detection electrodes. Each piece of second detection data indicates the magnitude of the mutual capacitance between the corresponding second detection electrode and a first detection electrode. This processing may, for example, include signal extraction via a PGA circuit, analog-to-digital conversion via an ADC circuit, and demodulation via a demodulation circuit.

[0092] Since the second sensing signal changes with the touch or proximity of an object such as a user's finger or a pen, the touch coordinates and the presence / absence of a touch can be detected based on the second detection data obtained by processing the second sensing signal.

[0093] In an embodiment of the present application, the signal waveform of the second drive signal is different from the signal waveform of the second sensing signal. The difference in signal waveforms at least includes a difference in the amplitude of the waveform. For example, the second drive signal is a sine wave signal, a square wave signal, or a triangular wave signal with a specific drive frequency, which is usually generated by the touch chip. For example, the signal waveform of the second drive signal can be as shown in Figure 10. The second sensing signal is a signal of the second drive signal coupled by capacitance, and its amplitude is reduced relative to the second drive signal. For example, the signal waveform of the second sensing signal can be as shown in Figure 11, and the signal waveform of the second sensing signal is significantly reduced relative to the signal waveform of the second drive signal. In addition, since the second sensing signal is a signal of the second drive signal coupled by capacitance, in some embodiments, the second sensing signal has a certain phase offset relative to the second drive signal. In addition, the second sensing signal may be affected by interference from the display screen and interference coupled when other modules inside the touch panel are working, so that the second sensing signal is also coupled with some noise. Accordingly, the difference in signal waveforms can also include different amplitudes and phases of the signal waveforms.

[0094] In one implementation of the present application, the signal waveform of the first drive signal is similar to the signal waveform of the second drive signal. The similarity between the signal waveforms of the first drive signal and the second drive signal may mean that the amplitudes of the signal waveforms of the first drive signal and the second drive signal are similar, for example, substantially the same. For example, the signal waveforms of the first drive signal and the second drive signal are both signal waveforms having relatively high amplitudes, as shown in FIG10 .

[0095] In one implementation of the present application, the waveform of the first sensing signal is similar to the waveform of the second sensing signal. The similarity between the waveforms of the first sensing signal and the second sensing signal may refer to a similar shape between the waveforms of the first sensing signal and the second sensing signal. For example, both have waveforms with a lower amplitude, as shown in FIG11 . Since the second specific detection electrode functions as a TX electrode during touch detection and as an RX electrode during opening / closing state detection, it is possible to determine whether the second specific detection electrode functions as a TX electrode or an RX electrode by detecting the waveform signal of the second specific detection electrode. When the waveform of the signal detected from the second specific detection electrode is similar to the waveform of the second sensing signal, it can be determined that the second specific detection electrode functions as an RX electrode. For example, the second specific detection electrodes TX20, TX21, and TX22 shown in FIG3 function as TX electrodes during touch detection, cooperating with the RX electrodes arranged along the second direction to detect the touch position of the foldable screen. During opening / closing detection, they function as RX electrodes, cooperating with the first specific detection electrodes TX15, TX16, and TX17 to detect the opening / closing state of the foldable screen. When the signal waveforms detected from the second specific detection electrodes TX20 , TX21 , and TX22 are similar to their corresponding second sensing signal waveforms, it can be determined that the second specific detection electrodes TX20 , TX21 , and TX22 function as RX electrodes.

[0096] In the embodiment of the present application, when the first drive signal is input to the first specific detection electrode and the first sensing signal is obtained from the second specific detection electrode, the plurality of second detection electrodes are in an idle state. That is, during the opening and closing detection period, the plurality of second detection electrodes are in an idle state.

[0097] Specifically, in one possible implementation, when the first drive signal is input to the first specific detection electrode and the first sensing signal is obtained from the second specific detection electrode, multiple second detection electrodes are grounded, suspended or connected to a fixed level to avoid interfering with the opening and closing detection of the folding screen.

[0098] In an embodiment of the present application, for the touch panel of the folding screen, its conventional function is to perform the operations in steps S202 to S208 shown in Figure 9. That is, touch position detection is achieved based on the mutual capacitance between a plurality of first detection electrodes in the touch panel (including a plurality of first detection electrodes in the first non-bending area 220a and a plurality of first detection electrodes in 220b) and a plurality of second detection electrodes perpendicular to the plurality of first detection electrodes (hereinafter referred to as conventional mutual capacitance sampling). In order not to affect the conventional mutual capacitance sampling, steps S102 to S108 (hereinafter referred to as mutual capacitance opening and closing sampling) for detecting the opening and closing state of the folding screen provided in an embodiment of the present application can be performed after each conventional mutual capacitance sampling is performed.

[0099] For example, for the touch panel shown in Figure 2, the register can be configured by software so that the touch chip operates according to the process shown in Figure 12. First, execute the conventional mutual capacitance sampling process in 602, for example, execute steps S202 to S204 in Figure 9 to realize touch position detection of the folding screen. After each execution of the conventional mutual capacitance sampling process, the TX20 electrode, TX21 electrode and TX22 electrode in the second non-bending area 220b of the touch panel, which serve as the second specific detection electrode, are converted to RX electrodes (i.e., TX is converted to RX in 604), so as to be used in conjunction with the TX15 electrode, TX16 electrode and TX17 electrode in the first non-bending area 220a as the first specific detection electrode to execute the mutual capacitance opening and closing sampling process in 606, for example, execute steps S102 to S108 shown in Figure 2 to realize the opening and closing state detection of the folding screen. After completing the mutual capacitance opening and closing sampling process to obtain the opening and closing state of the folding screen, the opening and closing state of the folding screen is stored in a predetermined address (i.e., the opening and closing state is reported in 608). Thereafter, the TX20 electrode, the TX21 electrode, and the TX22 electrode serving as the second specific detection electrodes are converted back to TX electrodes (TX to TX use in 608 ) to perform a conventional mutual capacitance sampling process.

[0100] The present application also provides a touch chip 700 suitable for a foldable screen. The touch panel of the foldable screen includes a bending area extending along a first direction and a first non-bending area and a second non-bending area distributed on both sides of the bending area along a second direction. The second direction is perpendicular to the first direction. The first non-bending area and the second non-bending area both include multiple first detection electrodes parallel to the first direction. As shown in Figure 13, the touch chip 700 includes:

[0101] A driving module 702 is configured to input a first driving signal to a first specific detection electrode, where the first specific detection electrode is a first detection electrode in the first non-bending region and close to the bending region;

[0102] an acquisition module 704 configured to acquire a first sensing signal in response to the first driving signal from a second specific detection electrode, where the second specific detection electrode is a first detection electrode in the second non-bending region and close to the bending region;

[0103] a processing module 706 for processing the acquired second sensing signal to obtain second detection data of the plurality of second detection electrodes;

[0104] The processing module 706 is further used to determine the opening and closing state of the folding screen based on the first detection data of the second specific detection electrode.

[0105] In one implementation, the second specific detection electrode is a first detection electrode in the second non-bending region that is symmetrically arranged with respect to the first specific detection electrode along the bending region.

[0106] In one implementation, the first specific detection electrode is a first detection electrode in the first non-bending area that is closest to the bending area, and the second specific detection electrode is a first detection electrode in the second non-bending area that is closest to the bending area.

[0107] In one implementation, the number of the first specific detection electrodes and the number of the second specific detection electrodes are both N, where N is a positive integer greater than or equal to 2.

[0108] In one implementation, a signal waveform of the first driving signal is different from a signal waveform of the first sensing signal.

[0109] In one implementation, the touch panel of the folding screen further includes a plurality of second detection electrodes arranged along the second direction, the plurality of second detection electrodes being perpendicular to the plurality of first detection electrodes in the first non-bending area and the second non-bending area.

[0110] The driving module 702 is further configured to: input a second driving signal to the plurality of first detection electrodes;

[0111] The acquisition module 704 is further configured to: acquire a second sensing signal in response to the second driving signal from the plurality of second detection electrodes;

[0112] The processing module 706 is further configured to: process the acquired second sensing signal to obtain second detection data of the plurality of second detection electrodes;

[0113] The processing module 706 is further configured to determine a touch detection result according to the second detection data of the plurality of second detection electrodes.

[0114] In one implementation, a signal waveform of the first sensing signal is similar to a signal waveform of the second sensing signal.

[0115] In one implementation, when the driving module 702 inputs the first driving signal to the first specific detection electrode and the acquiring module 704 acquires the first sensing signal from the second specific detection electrode, the plurality of second detection electrodes are in an idle state.

[0116] In one implementation, when the driving module 702 inputs the first driving signal to the first specific detection electrode and the acquiring module 704 acquires the first sensing signal from the second specific detection electrode, the plurality of second detection electrodes are grounded, suspended, or connected to a fixed level.

[0117] In one implementation, the driving module 702 is specifically configured to: simultaneously input a first driving signal to N first specific detection electrodes at N moments within an opening and closing detection cycle; the acquiring module 704 is specifically configured to: for each second specific detection electrode, acquire a sensing signal of the second specific detection electrode when the first driving signal is simultaneously input to the N first specific detection electrodes at each moment, as the first sensing signal of the second specific detection electrode.

[0118] In one implementation, the driving module 702 is specifically configured to: input a first driving signal to N first specific detection electrodes in sequence during an opening and closing detection cycle; the acquiring module 704 is specifically configured to: for each second specific detection electrode, acquire the sensing signal of the second specific detection electrode when the first driving signal is input to each first specific detection electrode, as the first sensing signal of the second specific detection electrode

[0119] In one implementation, the processing module 706 is specifically used to determine the opening and closing state of the folding screen based on a comparison result between the first detection data of the second specific detection electrode and the first detection threshold.

[0120] In one implementation, the first detection data of each second specific detection electrode includes third detection data for indicating the size of the capacitance between the second specific detection electrode and the symmetrically arranged first specific detection electrode, and the processing module 706 is specifically used to determine the opening and closing state of the folding screen based on the comparison result of the third detection data of N second specific detection electrodes and the first detection threshold.

[0121] In one implementation, the processing module 706 is specifically used to: if any one of the third detection data of the N second specific detection electrodes is greater than the first detection threshold, determine that the folding screen is in a closed state; or, if the third detection data of the N second specific detection electrodes are all less than or equal to the first detection threshold, determine that the folding screen is in an unfolded state.

[0122] In one implementation, the first detection data of each second specific detection electrode includes third detection data for indicating the size of the capacitance between the second specific detection electrode and the symmetrically arranged first specific detection electrode, and fourth detection data for indicating the size of the capacitance between the second specific detection electrode and the asymmetrically arranged first specific detection electrode; the processing module 706 is specifically used to: subtract the third detection data of the N second specific detection electrodes from the minimum data in the fourth detection data to obtain N difference values; determine the opening and closing state of the folding screen based on the comparison result of the N difference values ​​with the second detection threshold.

[0123] In one implementation, the processing module 706 is specifically used to: if any one of the N difference values ​​is greater than the second detection threshold, determine that the folding screen is in a closed state; or, if all of the N difference values ​​are less than or equal to the second detection threshold, determine that the folding screen is in an unfolded state.

[0124] The present application also provides an electronic device, which includes a folding screen and a touch chip, and the touch chip is used to execute the capacitance detection method for the folding screen provided by any of the aforementioned method embodiments.

[0125] By way of example and not limitation, the electronic device in the embodiments of the present application may be a portable or mobile computing device such as a terminal device, a mobile phone, a tablet computer, a laptop computer, a desktop computer, a gaming device, an in-vehicle electronic device, or a wearable smart device, as well as other electronic devices such as an electronic database, a car, and an automated teller machine (ATM).

[0126] The terminal devices of the embodiments of the present application exist in various forms, including but not limited to:

[0127] (1) Mobile communication devices: These devices are characterized by their mobile communication capabilities and are primarily designed to provide voice and data communications. These terminals include smartphones (e.g., iPhones), multimedia phones, feature phones, and low-end phones.

[0128] (2) Ultra-mobile personal computer devices: These devices fall under the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access. These terminals include PDAs, MIDs, and UMPCs, such as the iPad.

[0129] (3) Portable entertainment devices: These devices can display and play multimedia content. These devices include audio and video players (such as iPods), handheld game consoles, e-books, smart toys, and portable car navigation devices.

[0130] (4) Server: A device that provides computing services. The server consists of a processor 810, a hard disk, memory, a system bus, etc. The server is similar to a general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, and manageability.

[0131] (5) Other electronic devices with data interaction functions.

[0132] Thus far, specific embodiments of the present subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing may be advantageous.

[0133] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0134] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A capacitance detection method for a foldable screen, wherein the touch panel of the foldable screen includes a bending region extending along a first direction, and first and second non-bending regions distributed on both sides of the bending region along a second direction, wherein the second direction is perpendicular to the first direction, and the first and second non-bending regions each include a plurality of first detection electrodes parallel to the first direction. The method comprises: Inputting a first driving signal to a first specific detection electrode, where the first specific detection electrode is a first detection electrode in the first non-bending area close to the bending area; obtaining a first sensing signal in response to the first driving signal from a second specific detection electrode, where the second specific detection electrode is a first detection electrode in the second non-bending region close to the bending region; processing the acquired first sensing signal to obtain first detection data of the second specific detection electrode; The opening and closing state of the folding screen is determined according to the first detection data of the second specific detection electrode.

2. The method according to claim 1, wherein The second specific detection electrode is a first detection electrode in the second non-bending area and is symmetrically arranged with respect to the first specific detection electrode along the bending area.

3. The method according to claim 1 or 2, wherein: The first specific detection electrode is the first detection electrode closest to the bending zone in the first non-bending zone, and the second specific detection electrode is the first detection electrode closest to the bending zone in the second non-bending zone.

4. The method according to claim 1 or 2, wherein: The number of the first specific detection electrodes and the number of the second specific detection electrodes are both N, and N is a positive integer greater than or equal to 2.

5. The method according to claim 1, wherein The signal waveform of the first driving signal is different from the signal waveform of the first sensing signal.

6. The method according to claim 1, wherein The touch panel of the foldable screen further includes a plurality of second detection electrodes arranged along a second direction, the plurality of second detection electrodes being perpendicular to the plurality of first detection electrodes in the first non-bending area and the second non-bending area, and the method further includes: inputting a second driving signal to the plurality of first detection electrodes; acquiring a second sensing signal in response to the second driving signal from the plurality of second detection electrodes; processing the acquired second sensing signals to obtain second detection data of the plurality of second detection electrodes; A touch detection result is determined according to the second detection data of the plurality of second detection electrodes.

7. The method according to claim 6, wherein: The signal waveform of the first sensing signal is similar to the signal waveform of the second sensing signal.

8. The method according to claim 6, wherein: When the first driving signal is input to the first specific detection electrode and the first sensing signal is acquired from the second specific detection electrode, the plurality of second detection electrodes are in an idle state.

9. The method according to claim 8, wherein When the first driving signal is input to the first specific detection electrode and the first sensing signal is obtained from the second specific detection electrode, the plurality of second detection electrodes are grounded, suspended, or connected to a fixed potential.

10. The method according to claim 4, wherein: The step of inputting a driving signal to the first specific detection electrode comprises: At N moments in one opening and closing detection cycle, the first driving signal is simultaneously inputted to N first specific detection electrodes; The obtaining of the first sensing signal in response to the first driving signal from the second specific detection electrode includes: for each of the second specific detection electrodes, obtaining, as the first sensing signal of the second specific detection electrode, a sensing signal of the second specific detection electrode when the first driving signal is simultaneously input to the N first specific detection electrodes at each moment.

11. The method according to claim 4, wherein The step of inputting a driving signal to the first specific detection electrode comprises: In one opening and closing detection cycle, the first driving signal is sequentially inputted to N first specific detection electrodes; The obtaining of a first sensing signal in response to the first driving signal from the second specific detection electrode includes: For each of the second specific detection electrodes, a sensing signal of the second specific detection electrode when the first driving signal is input to each of the first specific detection electrodes is acquired as a first sensing signal of the second specific detection electrode.

12. The method according to claim 1, wherein The determining the opening and closing state of the folding screen according to the first detection data of the second specific detection electrode includes: The opening and closing state of the folding screen is determined according to a comparison result of the first detection data of the second specific detection electrode and a first detection threshold.

13. The method according to claim 4, wherein: The first detection data of each second specific detection electrode includes third detection data indicating the size of the capacitance between the second specific detection electrode and the symmetrically arranged first specific detection electrodes. The determining the opening and closing state of the folding screen according to the first detection data of the second specific detection electrode includes: The opening and closing state of the folding screen is determined according to the comparison result of the third detection data of the N second specific detection electrodes and the first detection threshold.

14. The method according to claim 13, wherein The determining the opening and closing state of the folding screen according to a comparison result of the third detection data of the N second specific detection electrodes with the first detection threshold includes: If any one of the third detection data of the N second specific detection electrodes is greater than the first detection threshold, it is determined that the folding screen is in a closed state, or, If the third detection data of the N second specific detection electrodes are all less than or equal to the first detection threshold, it is determined that the folding screen is in the unfolded state.

15. The method according to claim 4, wherein The first detection data of each second specific detection electrode includes third detection data indicating the size of the capacitance between the second specific detection electrode and the symmetrically arranged first specific detection electrodes, and fourth detection data indicating the size of the capacitance between the second specific detection electrode and the asymmetrical first specific detection electrode. The determining the opening and closing state of the folding screen according to the first detection data of the second specific detection electrode includes: Subtracting the third detection data of the N second specific detection electrodes from the minimum data in the fourth detection data to obtain N difference values; The opening and closing state of the folding screen is determined based on the comparison result of the N difference values ​​and the second detection threshold.

16. The method according to claim 15, wherein Determining the open / closed state of the folding screen according to a comparison result of the N differences with a second detection threshold includes: If any one of the N differences is greater than the second detection threshold, it is determined that the folding screen is in a closed state, or, If the N differences are all less than or equal to the second detection threshold, it is determined that the folding screen is in the unfolded state.

17. A touch chip suitable for a foldable screen, wherein the touch panel of the foldable screen includes a bending region extending along a first direction and a first non-bending region and a second non-bending region distributed on both sides of the bending region along a second direction, wherein the second direction is perpendicular to the first direction, and the first non-bending region and the second non-bending region each include a plurality of first detection electrodes parallel to the first direction. The touch chip comprises: a driving module, configured to input a first driving signal to a first specific detection electrode, wherein the first specific detection electrode is a first detection electrode in the first non-bending area close to the bending area; an acquisition module, configured to acquire a first sensing signal in response to the first driving signal from a second specific detection electrode, where the second specific detection electrode is a first detection electrode in the second non-bending region close to the bending region; as well as The processing module is used to process the acquired first sensing signal to determine the opening and closing state of the folding screen.

18. The touch control chip according to claim 17, wherein: The second specific detection electrode is a first detection electrode in the second non-bending area and is symmetrically arranged with respect to the first specific detection electrode along the bending area.

19. The touch control chip according to claim 17 or 18, wherein: The first specific detection electrode is the first detection electrode closest to the bending zone in the first non-bending zone, and the second specific detection electrode is the first detection electrode closest to the bending zone in the second non-bending zone.

20. The touch control chip according to claim 17 or 18, wherein: The number of the first specific detection electrodes and the number of the second specific detection electrodes are both N, where N is a positive integer greater than or equal to 2.

21. The touch control chip according to claim 17, wherein: The signal waveform of the first driving signal is different from the signal waveform of the first sensing signal.

22. The touch control chip according to claim 17, wherein: The touch panel of the folding screen further includes a plurality of second detection electrodes arranged along a second direction, wherein the plurality of second detection electrodes are perpendicular to the plurality of first detection electrodes in the first non-bending area and the second non-bending area. The driving module is further configured to: input a second driving signal to the plurality of first detection electrodes; The acquisition module is further configured to: acquire a second sensing signal in response to the second driving signal from the plurality of second detection electrodes; The processing module is further configured to: process the acquired second sensing signal to obtain second detection data of the plurality of second detection electrodes; The processing module is further configured to determine a touch detection result according to the second detection data of the plurality of second detection electrodes.

23. The touch control chip according to claim 22, wherein: The signal waveform of the first sensing signal is similar to the signal waveform of the second sensing signal.

24. The touch control chip according to claim 22, wherein: When the driving module inputs the first driving signal to the first specific detection electrode and the acquiring module acquires the first sensing signal from the second specific detection electrode, the plurality of second detection electrodes are in an idle state.

25. The touch control chip according to claim 24, wherein: When the driving module inputs the first driving signal to the first specific detection electrode and the acquiring module acquires the first sensing signal from the second specific detection electrode, the plurality of second detection electrodes are grounded, suspended, or connected to a fixed level.

26. The touch control chip according to claim 20, wherein: The driving module is specifically configured to: simultaneously input the first driving signal to N first specific detection electrodes at N moments in an opening and closing detection cycle; The acquisition module is specifically configured to: for each second specific detection electrode, acquire a sensing signal of the second specific detection electrode when the first driving signal is simultaneously input to the N first specific detection electrodes at each moment, as the first sensing signal of the second specific detection electrode.

27. The touch control chip according to claim 20, wherein: The driving module is specifically configured to: input the first driving signal to N first specific detection electrodes in sequence within an opening and closing detection cycle; The acquisition module is specifically configured to: for each second specific detection electrode, acquire a sensing signal of the second specific detection electrode when the first driving signal is input to each first specific detection electrode, as the first sensing signal of the second specific detection electrode.

28. The touch control chip according to claim 17, wherein: The processing module is specifically used to: process the acquired first sensing signal to obtain the first detection data of the second specific detection electrode; and determine the opening and closing state of the folding screen based on the comparison result of the first detection data of the second specific detection electrode and the first detection threshold.

29. The touch control chip according to claim 20, wherein: The first detection data of each second specific detection electrode includes third detection data indicating the size of the capacitance between the second specific detection electrode and the symmetrically arranged first specific detection electrodes. The processing module is specifically used to determine the opening and closing state of the folding screen based on the comparison result of the third detection data of N second specific detection electrodes and the first detection threshold.

30. The touch control chip according to claim 29, wherein: The processing module is specifically used for: If any one of the third detection data of the N second specific detection electrodes is greater than the first detection threshold, it is determined that the folding screen is in a closed state, or, If the third detection data of the N second specific detection electrodes are all less than or equal to the first detection threshold, it is determined that the folding screen is in the unfolded state.

31. The touch control chip according to claim 20, wherein: The first detection data of each second specific detection electrode includes third detection data indicating the size of the capacitance between the second specific detection electrode and the symmetrically arranged first specific detection electrodes, and fourth detection data indicating the size of the capacitance between the second specific detection electrode and the asymmetrical first specific detection electrode; The processing module is specifically used for: Subtracting the third detection data of the N second specific detection electrodes from the minimum data in the fourth detection data to obtain N difference values; The opening and closing state of the folding screen is determined based on the comparison result of the N difference values ​​and the second detection threshold.

32. The touch control chip according to claim 31, wherein: The processing module is specifically used for: If any one of the N differences is greater than the second detection threshold, it is determined that the folding screen is in a closed state, or, If the N differences are all less than or equal to the second detection threshold, it is determined that the folding screen is in the unfolded state.

33. An electronic device comprising: Folding screen; as well as A touch chip for executing the capacitance detection method for a folding screen according to any one of claims 1 to 16.

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