Touch detection method and touch detection circuit, touch display panel and electronic device

Abstract

The application discloses a touch detection method, a touch detection circuit, a touch display panel and electronic equipment. The touch detection method comprises the following steps: providing a plurality of first electrodes with a first extension direction and two positioning detection electrodes arranged on both sides of the first electrodes and intersecting the extension line of the first electrodes; judging the coordinate of the touch position in the direction intersecting the first extension direction by detecting the self-capacitance size of the first electrode; and judging the coordinate of the touch position in the first extension direction by detecting the self-capacitance size of the positioning detection electrode or detecting the mutual-capacitance size between the positioning detection electrode and the first electrode. The application further discloses a touch detection circuit, a touch display panel and electronic equipment adopting the above touch detection method. The application has good user experience.

Description

Technical Field

[0001] This invention relates to the field of electronic technology, and in particular to a touch detection method, touch detection circuit, touch display panel, and electronic device that provides a better user experience. Background Technology

[0002] With technological advancements and improved living standards, the use of display devices, including mobile phones, tablets, and wearable digital products, is increasing.

[0003] Organic light-emitting diode (OLED) display technology is a technology that uses organic semiconductor materials to achieve reversible color changes when driven by an electric current. OLEDs offer advantages such as being lightweight, thin, low-power, high-contrast, and capable of flexible displays, making them considered the most promising next-generation display technology. Based on the driving method, OLED display technology can be divided into passive matrix OLED (PMOLED) and active matrix OLED (AMOLED) display technologies. Currently, PMOLED display panels are widely used in small-sized electronic devices, such as watches and media players.

[0004] Touch detection and control can be achieved by adding touch detection electrodes and chips to OLED display panels. Display panels with touch detection and display driving capabilities are often referred to as touch display panels. However, due to the arrangement of electrodes in PMOLED display panels, using PMOLED electrodes for touch detection can lead to touch positioning problems. Detection can only be performed in one dimension, and two-dimensional positioning is not possible, resulting in a poor user experience. Summary of the Invention

[0005] The purpose of this invention is to provide a touch detection method with a better user experience, as well as a touch detection circuit, touch display panel, and electronic device using the touch detection method.

[0006] One aspect of the present invention discloses a touch detection method, comprising providing a plurality of first electrodes having a first extending direction and two positioning detection electrodes disposed on both sides of the first electrodes and intersecting with the extension line of the first electrodes; determining the coordinates of the touch position in the direction intersecting with the extending direction of the first electrodes by detecting the self-capacitance of the first electrodes; and determining the coordinates of the touch position in the extending direction of the first electrodes by detecting the self-capacitance of the positioning detection electrodes or detecting the mutual capacitance between the positioning detection electrodes and the first electrodes.

[0007] Optionally, it also includes providing a plurality of second electrodes having a second extending direction and overlapping with the first electrode and a light-emitting layer disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode together constitute a display area, and the first electrode and the positioning detection electrode together constitute a touch detection area.

[0008] Optionally, the touch detection area may be divided into multiple touch button areas, and a user interface adjacent to the positioning detection electrode may be displayed in the multiple button areas.

[0009] Optionally, the first electrode forms a first electrode layer, the second electrode forms a second electrode layer, the positioning detection electrode is disposed on the same layer as the first electrode, or the positioning detection electrode is disposed on the same layer as the second electrode, or the positioning detection electrode is disposed on a separate layer on the first electrode.

[0010] Optionally, a touch detection circuit is also provided, which is used to detect the self-capacitance of the first electrode and the self-capacitance of the positioning detection electrode or the mutual capacitance between the positioning detection electrode and the first electrode.

[0011] Optionally, the first electrode layer and the second electrode layer are ITO layers or ITO / Ag / ITO composite layers, or the first electrode layer and the second electrode layer are made of opaque conductive materials.

[0012] Optionally, the touch detection circuit includes an amplification module, an analog-to-digital converter, and a processor. The amplification module receives the charge change of the self-capacitance of the first electrode and the positioning detection electrode and outputs a corresponding amplified touch detection voltage to the analog-to-digital converter. The analog-to-digital converter outputs a digital signal to the processor based on the analog touch detection voltage signal. The processor processes the signal to obtain the touch detection result.

[0013] One aspect of the present invention also discloses a touch detection circuit, which employs the touch detection method described above.

[0014] One aspect of the present invention also discloses a touch display panel, which employs the touch detection method described above or includes the touch detection circuit described above.

[0015] One aspect of the present invention also discloses an electronic device that employs the above-described touch detection method or includes the above-described touch display panel. The electronic device is one of a mobile phone, tablet computer, laptop computer, e-book reader, electronic watch, augmented reality / virtual reality device, human motion detection device, autonomous vehicle, smart home device, security device, and intelligent robot.

[0016] Compared to existing technologies, the touch detection method, touch detection circuit, touch display panel, and electronic device of this invention have positioning detection electrodes disposed on both sides of a first electrode. The first electrode and the positioning detection electrodes, including a first positioning electrode and a second positioning electrode, can be used to detect touch actions. Furthermore, the first electrode can position the touch location in the direction intersecting its extension direction, and the positioning detection electrodes can position the touch location in the extension direction of the first electrode, thereby achieving two-dimensional touch positioning and overcoming the technical problem of existing PMOLED touch display panels that only have single-directional touch detection. In addition, by configuring a user interface with the first and second positioning detection electrodes adjacent to each other, this invention allows the touch location to overlap with the first electrode and the first positioning detection electrode, or the first and second positioning detection electrodes, when the user performs a touch action. This enables the determination of the two-dimensional coordinate direction of the touch location by detecting the self-capacitance of the first electrode and the first and second positioning detection electrodes. Therefore, this invention provides a better user experience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the embodiment shown;

[0019] Figure 3 yes Figure 1 The circuit block diagram of the embodiment shown is shown.

[0020] Figure 4 yes Figure 1 A partial signal diagram of the embodiment shown;

[0021] Figure 5 This is a schematic diagram of the touch detection area according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of a touch detection circuit according to an embodiment of the present invention;

[0023] Figure 7 This is a circuit diagram of one embodiment of the present invention;

[0024] Figure 8 This is a cross-sectional schematic diagram of an embodiment of the present invention;

[0025] Figure 9 This is a cross-sectional schematic diagram of an embodiment of the present invention;

[0026] Figure 10 This is a cross-sectional schematic diagram of an embodiment of the present invention;

[0027] Figure 11 This is a circuit block diagram of an embodiment of the present invention;

[0028] Figure 12 This is a circuit block diagram of an embodiment of the present invention;

[0029] Figure 13 This is a circuit block diagram of an embodiment of the present invention;

[0030] Figure 14 This is a flowchart illustrating an embodiment of the touch detection method of the present invention. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The features and structures described in this application can be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a thorough understanding of the embodiments of the present application. However, those skilled in the art should realize that the technical solutions of the present application can be practiced even without one or more of the specific details, or by using other structures, components, etc. In other cases, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the present application.

[0032] Currently, capacitive touch technology is divided into surface capacitive and projected capacitive technologies. Projected capacitive technology, based on its detection method, is further divided into self-capacitance and mutual capacitance. In self-capacitance, a transparent conductive material is used to create an array of electrodes arranged alternately horizontally and vertically on the surface of a glass substrate. These horizontal and vertical electrodes each form a capacitance with ground. This capacitance is what is commonly referred to as self-capacitance, or the capacitance of the electrode to ground. A display panel with touch detection functionality is also called a touch display panel or a touchscreen.

[0033] For self-capacitance touch display panels, when a person is not touching the touch detection area of ​​the panel, the capacitance of each self-capacitance electrode is a fixed value. When a person touches the screen, the capacitance of the corresponding self-capacitance electrode becomes a fixed value plus the capacitance of the human body. By detecting the change in capacitance value of each self-capacitance electrode, the touch position can be determined. The basic principle is a continuously charging and discharging circuit. If a finger or other object touches the panel area, it changes the self-capacitance of the corresponding electrode in the touched area, causing a change in the charge or discharge, and the corresponding output voltage of the amplifier will also change. By calculating the changes in charge or discharge or output voltage, the touch detection function is achieved.

[0034] In one embodiment of the present invention, a touch display panel includes a first electrode layer, a second electrode layer disposed opposite to the first electrode layer, and a light-emitting layer disposed between the first electrode layer and the second electrode layer. The first electrode layer includes a plurality of first electrodes extending along a first direction, and the second electrode layer includes a plurality of second electrodes extending along a second direction. A protective glass cover or glass substrate may also be disposed on the first electrode layer.

[0035] In this embodiment, the first and second electrodes are strip-shaped electrodes, with the first and second directions perpendicular to each other. The light-emitting layer is an organic electroluminescent layer (EL layer), which emits light when current flows through it. Each overlap of the first and second electrodes can be considered a pixel. By providing current to the first and second electrodes, the current can flow through them to address and activate the pixel. The touch display panel can excite the light-emitting layer at different locations, causing pixels at different locations to emit light or not.

[0036] In this embodiment, the first electrode layer and the second electrode layer can be made of materials with good conductivity and light transmittance, such as transparent conductive oxides like indium tin oxide (ITO). The first electrode layer and the second electrode layer can also have a multilayer structure, such as an ITO / Ag / ITO composite layer. Of course, in other embodiments of the present invention, the first electrode layer and the second electrode layer can also be made of opaque conductive materials, and the present invention is not limiting.

[0037] In this embodiment, the first electrode can be an anode, the second electrode can be a cathode, the light-emitting layer can be an OLED light-emitting layer, and the touch display panel can be a PMOLED display panel with touch control functionality. Of course, this invention is not limited thereto. In other embodiments of this invention, the touch display panel can be any LED-based display panel made of any organic or inorganic electroluminescent material.

[0038] The touch display panel connects a display driver chip and a touch detection chip. These two chips can be separate entities or integrated into a single chip, for example, through Touch and Display Driver Integration (TDDI) technology. The display driver chip and touch detection chip are sometimes referred to as a display driver circuit and a touch detection circuit.

[0039] The display driving circuit includes a scanning driving circuit and a data driving circuit. The scanning driving circuit scans the plurality of second electrodes row by row, and the data driving circuit simultaneously provides the light-emitting current to the plurality of first electrodes. During the display time of one frame, only one of the plurality of second electrodes is short-circuited to the ground terminal at any given time. At this time, the other second electrodes are disconnected from the ground terminal and provided with a high-level common voltage (Vcom). The plurality of first electrodes are simultaneously supplied with current, so that the current flows through the first electrode and the grounded second electrode, thereby enabling the pixel of the light-emitting layer to emit light at the corresponding grounded first electrode. The above process is repeated row by row of second electrodes until all second electrodes are scanned, thus completing the display of one frame. For example, but not limited to, if the touch display panel has a refresh rate of 100Hz, then the scanning of the second electrodes should be completed within 10ms for each frame. The first electrode can also be called a column electrode or SEG electrode, the second electrode can also be called a row electrode or COM electrode, the scanning driving circuit can also be called a row driving circuit, and the data driving circuit can also be called a column driving circuit. In some modified embodiments of the present invention, the first electrode is a COM electrode and the second electrode is a SEG electrode. The grounding terminal can be an earth grounding terminal, an equipment grounding terminal, or other grounding terminals defined as needed. In this invention, it should be interpreted broadly and is not specifically limited thereto.

[0040] In this embodiment, to achieve touch detection, the first electrode of the touch display panel can be reused as a touch detection electrode. A touch detection circuit connected to the first electrode detects changes in its self-capacitance, enabling the detection of the position of an external object (e.g., a finger) touching the touch display panel, thus achieving touch detection. During touch detection, if a user's finger touches the glass cover adjacent to the first electrode, a parasitic capacitance is formed between the finger and the first electrode due to the user's own electrical charge, increasing the self-capacitance of the first electrode corresponding to the finger's touch area. This change in self-capacitance causes a change in the charging and discharging charge of the touch detection circuit, and the processor can calculate the self-capacitance based on the amount of charging and discharging charge, or estimate the self-capacitance based on the pulse voltage value. By detecting changes in the pulse signal voltage or the amount of charging and discharging charge on the first electrode, the touch detection circuit can determine the first electrode whose self-capacitance has changed, thereby determining the touch position. In other words, the position or coordinates of the finger's touch location in the direction intersecting the extension direction of the first electrode can be confirmed through the first electrode.

[0041] Of course, in a modified embodiment of the present invention, the second electrode may also be reused as a touch detection electrode.

[0042] To confirm the position of a finger touch on the extended direction of the first electrode during touch detection, the touch display panel may further include multiple positioning detection electrodes. These electrodes are strip-shaped and have an extension direction inconsistent with that of the first electrode. For example, but not limited to, the extension direction of the positioning detection electrodes is perpendicular to the extension direction of the first electrode. Since the extension direction of the first electrode is a first direction and the extension direction of the second electrode is a second direction, when the second direction is perpendicular to the first direction, the extension direction of the positioning detection electrodes is consistent with the second direction. The positioning detection electrodes are used only for touch detection and not for display driving, and can be used to detect the position of a finger touch on the glass cover plate in the extension direction of the first electrode. The positioning detection electrodes are connected to the touch detection circuit, and may or may not be connected to the scanning driving circuit. The positioning detection electrodes may be disposed on the same layer as the first electrode layer, or disposed on the first electrode layer through an insulating layer, or disposed on the same layer as the second electrode layer. The two positioning detection electrodes may be disposed on the same layer or on different layers.

[0043] The multiple first electrodes and multiple second electrodes overlap to form a grid distribution. The overlap of the first and second electrodes can be considered as a pixel. These multiple pixels constitute the display area of ​​the touch display panel. Therefore, it can also be said that the first and second electrodes together constitute the display area of ​​the touch display panel. Simultaneously, the first electrode is also reused as a touch detection electrode during touch detection. Therefore, the multiple first electrodes and the positioning detection electrode together constitute the touch detection area of ​​the touch display panel.

[0044] In this embodiment, the plurality of positioning detection electrodes includes a first positioning detection electrode and a second positioning detection electrode disposed perpendicular to the first electrode on both sides of the first electrode layer. The first and second positioning detection electrodes intersect with the first electrode or the extension line of the first electrode.

[0045] In this embodiment, the touch detection and display driving are performed in a time-division manner. That is, at any given moment, the touch display panel is either in the display stage or in the touch detection stage, but not simultaneously in display driving and touch detection. For example, the touch detection circuit detects the change in self-capacitance of the first electrode after each frame of image display ends. Therefore, the first electrode and the second electrode can be used for display driving, and the first electrode and the two positioning detection electrodes can be used for touch detection. The first electrode can be used to detect the coordinates of the touch position in the direction intersecting its extension direction, and the two positioning detection electrodes can be used to detect the coordinates of the touch position in the extension direction of the first electrode.

[0046] It should be noted that other terms used to describe the first electrode and other terms used for touch detection may appear in this specification, such as, but not limited to, touch detection electrode, self-capacitance detection electrode, or detection electrode, etc., which will be understood by those skilled in the art to be equivalent to the first electrode of this invention. For ease of description, the first electrode and the positioning detection electrode can be collectively referred to as touch detection electrode when used for touch detection. In addition, the terms "first," "second," "row," "column," etc., appearing in this specification are merely descriptive terms for ease of understanding and do not represent any specific limitation.

[0047] The touch display panel of the present invention is a PMOLED display panel. When the light beam is emitted from one side of the OLED substrate, the PMOLED display panel is a bottom-emitting display panel; when the light beam is emitted from the side away from the substrate, the PMOLED display panel is a top-emitting display panel; when the light beam is emitted from both one side of the OLED substrate and the side away from the substrate, the PMOLED display panel is a double-sided emitting display panel.

[0048] Furthermore, it should be noted that although the embodiments of this application are all illustrated with a touch display panel, the touch display panel of the present invention can also be used in other embodiments that do not require image display, such as a touchpad for a laptop computer. In this case, the first electrode layer and the second electrode layer do not need to be transparent, and the glass substrate used for protection can be replaced by other materials.

[0049] Please see Figure 1 In one embodiment of the present invention, a touch display panel includes a first electrode layer (unlabeled) composed of a plurality of first electrodes 12 extending along a first direction, a second electrode layer (unlabeled) opposite to the first electrode layer composed of a plurality of second electrodes 14 extending along a second direction and overlapping the first electrodes 12, a light-emitting layer 13 disposed between the first electrode layer and the second electrode layer, a glass cover plate 11 disposed on the first electrode layer, and a first positioning detection electrode 101 and a second positioning detection electrode 102 disposed on both sides of the first electrode 12 and perpendicularly intersecting the first electrode 12 or its extension line. The first electrode 12 and the second electrode 14 are not directly connected, but are arranged in an alternating overlapping manner. In this embodiment, for example, but not limited to, the first electrodes 12 are parallel to each other, and the second electrodes 14 are parallel to each other and perpendicular to the second electrode 12. The first electrode layer is located above the second electrode layer. Above the glass cover plate 11, the user can see the image display and perform touch control on the upper surface of the glass cover plate 11. The extension line of the first electrode 12 includes an extension line along a first direction and an extension line in the opposite direction to the first direction.

[0050] Please also refer to Figure 2 The first positioning detection electrode 101 and the second positioning detection electrode 102 are disposed on the same layer as the first electrode 12. In other embodiments of the present invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 may also be disposed on the same layer as the second electrode 14, or a separate layer may be disposed on the first electrode layer; the present invention is not limited thereto. The light-emitting layer 13 includes an electroluminescent layer composed of an organic molecular thin film, such as, but not limited to, an OLED stacked layer. The first electrode 12 is the anode, and the second electrode 14 is the cathode. The first electrode 12 and the second electrode 14 can be used to provide current to the light-emitting layer 13 and receive current from the light-emitting layer 13, respectively.

[0051] Please also refer to Figure 3The touch display panel further includes a touch detection circuit 110, a data driving circuit 120, and a scan driving circuit 130. The touch detection circuit 110 is connected to the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102, and is used to detect changes in the self-capacitance of these electrodes. The data driving circuit 120 is connected to the first electrode 12 and is used to provide current to the first electrode 12. The scan driving circuit 130 is connected to the second electrode 14 and is used to drive the second electrode 14 line by line, so that the corresponding scanned second electrode 14 is grounded, thereby allowing current to flow between the corresponding scanned second electrode 14 and the first electrode 12, while other unscanned second electrodes 14 are disconnected from ground and not connected to the first electrode 12. By repeating this line-by-line scanning and display, one frame of image display is completed. During the interval between each frame of image display, the touch display panel is in touch detection mode. The touch detection circuit 110 performs touch detection on the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102. The scanning drive circuit 130 provides a high-level common voltage to the second electrode 14. The touch detection circuit 110 causes the self-capacitance of the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102 to be charged and discharged, and detects the charge amount signal or the coupling voltage signal. Through further processing of the charge amount signal or the coupling voltage signal, the touch action and touch position of an external object (such as a finger) on the touch display panel are detected.

[0052] The multiple first electrodes 12 and multiple second electrodes 14 overlap to form a grid distribution. The overlap of the first electrodes 12 and the second electrodes 14 can be regarded as a pixel. The multiple pixels constitute the display area of ​​the touch display panel. Therefore, it can also be said that the first electrodes 12 and the second electrodes 14 together constitute the display area of ​​the touch display panel. At the same time, the first electrode 12 is also reused as a touch detection electrode during touch detection. Therefore, the multiple first electrodes 12, the first positioning detection electrode 101, and the second positioning detection electrode 102 together constitute the touch detection area of ​​the touch display panel. Obviously, during touch detection, the user's finger will affect the self-capacitance of the first electrode 12 and the first positioning detection electrode 101 or the second positioning detection electrode 102 at the touch position. Since the size of the finger is significantly larger than the width of the first electrode 12, the first positioning detection electrode, and the second positioning detection electrode 102, the resolution of the touch area used for touch detection does not need to be as high as the resolution of the display area. Therefore, during touch detection, the first electrode 12 can be divided into several detection channels, and each detection channel includes a certain number of first electrodes 12. The signals from each detection channel are connected in parallel and then input to the touch detection circuit 110. In this embodiment, the touch detection circuit 110 may include an amplification module, which may include multiple amplifiers respectively connected to the first electrode, the first positioning detection electrode, and the second positioning detection electrode. Alternatively, a portion of the multiple electrodes may be connected to an amplifier via a switch, or the charge signals from the charging and discharging of the multiple electrodes may be summed by an adder and then input to an amplifier.

[0053] Please also refer to Figure 4 Assume that the number of second electrodes 14 of the touch display panel is n. Figure 4 In the diagram, gl1 to gln (where n is a positive integer) represent the scanning signals applied to the n second electrodes 14. During the display phase, the touch display panel is in display driving mode, and the n second electrodes 14 are sequentially grounded under the scanning drive of the scanning signals gl1 to gln, allowing current to flow between the corresponding first electrode 12 and the grounded second electrode 14, thereby completing the display of the m-th frame image. During the touch detection phase, the touch detection circuit 110 operates, the first electrode 12 is used for touch detection, and the second electrodes 14 are connected to Vcom or a specific voltage to cooperate with touch detection. After the touch detection phase ends, the touch display panel enters the (m+1)-th frame display phase.

[0054] In a modified embodiment of this example, there can be 160 first electrodes 12 and 80 second electrodes 14. The first electrodes 12 and the second electrodes 14 form a 160*80 display area. During touch detection, five first electrodes 12 are combined into one detection channel. Therefore, the 160 first electrodes 12 form 32 detection channels and two detection channels for positioning detection electrodes 101 and 102. Please also refer to... Figure 5 The touch detection area of ​​the touch display panel may include eight touch button areas, including a first group of touch button areas A1, A2, A3, and A4 adjacent to the first positioning detection electrode 101, and a second group of touch button areas B1, B2, B3, and B4 adjacent to the second positioning detection electrode 102. Therefore, the eight touch button areas can be divided into two rows with vertical coordinates A and B and four columns with horizontal coordinates 1, 2, 3, and 4.

[0055] When a user touches a touch button area, the corresponding first electrode 12 can be detected by the touch detection circuit 110 to change its self-capacitance and confirm the horizontal coordinate of the touch button area. Simultaneously, the corresponding first positioning detection electrode 101 or second positioning detection electrode 102 can be detected by the touch detection circuit 110 to change its self-capacitance and confirm the vertical coordinate of the touch button area. Thus, the touch detection circuit 110 can determine which touch button area the user's touch is located in. The actual area of ​​the touch button area is not large. When configuring the user interface (UI) of the touch display panel, the icons or buttons representing touch can be positioned close to the first positioning detection electrode 101 or the second positioning detection electrode 102, so that the user will inevitably touch the first positioning detection electrode 101 or the second positioning detection electrode 102 without realizing it during touch operations. Figure 4 As shown, the circular dashed box represents the actual touch position of the user's finger, and the rectangular dashed box represents the touch-controllable user interface. During the display phase, in the display area corresponding to the touch button area, adjacent to the positioning detection electrode, the touch display panel displays the user interface adjacent to the first positioning detection area 101 or the second positioning detection area 102. Therefore, when the user performs a touch operation, the actual touch position overlaps with the first positioning detection electrode 101 or the second positioning detection electrode 102, thereby causing a change in the self-capacitance of the first positioning detection electrode 101 or the second positioning detection electrode 102.

[0056] In the above embodiments, the first positioning detection electrode 101 and the second positioning detection electrode 102 are exemplary. In other embodiments of the present invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 can be collectively referred to as positioning detection electrodes, and their number is not specifically limited.

[0057] In a modified embodiment of the above embodiments, the touch detection area can be divided into multiple touch button areas, and the touch display panel has a user interface adjacent to the positioning detection electrode in the display area corresponding to the touch button area.

[0058] Please see Figure 6 The touch detection circuit 110 includes an amplification module 111, an analog-to-digital converter 112, and a processor 113. During touch detection, the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102 are grounded; their corresponding grounding capacitance is the self-capacitance, which we collectively refer to as the touch detection capacitance. The amplification module 111 receives the charge change of the touch detection capacitance and outputs a corresponding amplified touch detection voltage to the analog-to-digital converter 112. The analog-to-digital converter 112 outputs a digital signal to the processor 113 based on the analog touch detection voltage signal. The processor 113 processes the signal to obtain the touch detection result.

[0059] The self-capacitance of the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102 is defined as the touch detection capacitor C1. The amplification module 111 includes a first switch S1, a second switch S2, a resistor R1, a third switch S3, an amplification capacitor C2, and an amplifier 1111. A high-level voltage VDD (e.g., device power supply voltage) is connected to one end of the touch detection capacitor C1 through the first switch S1, and the other end of the touch detection capacitor C1 is grounded (the touch detection capacitor C1 is actually the parasitic capacitance of the first electrode 12 or the first positioning detection electrode 101 and the second positioning detection electrode 102 to ground, i.e., its self-capacitance). The end of the touch detection capacitor C1 connected to the first switch S1 is also connected to the positive input terminal of the amplifier 1111 through the second switch S2 and the resistor R1. The output terminal of the amplifier 1111 is connected to the positive input terminal of the amplifier 1111 through the amplification capacitor C2. The negative input terminal of the amplifier 1111 is grounded. The third switch S3 is connected in parallel with the two ends of the amplifying capacitor C2 between the output terminal and the positive input terminal of the amplifier 1111. The amplifier 1111 outputs an amplified touch detection voltage Vout, the magnitude of which is Vout = (VDD - Vcmop) * C1 / C2, where Vcmop represents the common-mode voltage of the amplifier 1111. The common-mode voltage of the amplifier 1111 can be adjusted according to the circuit design requirements. Specifically, the initial charge of the touch detection capacitor C1 is C1 * VDD, the final charge is C1 * Vcmop, and the amount of charge released by the touch detection capacitor C1 is C1 * VDD - C1 * Vcmop. The above charge can be converted into a change in the output voltage of the amplifier 1111, that is, C2 * Vout = C1 * VDD - C1 * Vcmop. Therefore, Vout = (VDD - Vcmop) * C1 / C2.

[0060] The touch detection voltage Vout output by the amplifier 1111 is proportional to the touch detection capacitor C1. Therefore, the value of the touch detection capacitor C1 can be detected by detecting the magnitude of the touch detection voltage Vout. Here, grounding can be connected to earth, device ground, or other grounding terminals defined as needed.

[0061] The touch detection capacitor C1 is charged when the first switch S1 is on and the second switch S2 is off; it discharges when the first switch S1 is off and the second switch S2 is on, at which point part of the charge on the touch detection capacitor C1 is transferred to the amplifying capacitor C2. When the touch detection circuit 110 is working, the first switch S1 and the second switch S2 are continuously turned on and off under the control of a control unit (not shown), and the first switch S1 and the second switch S2 will never be turned on or off simultaneously. Therefore, during the continuous charging and discharging process of the touch detection capacitor C1, a pulse signal with a certain period and frequency is generated. This pulse signal is amplified by the amplifier 1111 and output to the analog-to-digital converter 112, and after further processing, a corresponding digital signal is output to the processor 113. The processor 113 can store the output signal of the analog-to-digital converter 112 into an array, compare the array value with a pre-stored reference value, and thus the point where the output signal changes significantly is the touch position.

[0062] The third switch S3 can be used to reset the amplifier 1111, which is normally off. In a modified embodiment of this invention, the touch detection circuit 110 may also include a filtering unit or component for filtering out noise; a control unit for generating pulse control signals, etc.

[0063] In a modified embodiment of the above embodiments, the touch detection circuit 110 can also achieve touch detection by detecting the mutual capacitance between the first positioning detection electrode 101 and / or the second positioning detection electrode 102 and a designated or adjacent first electrode 12. See also... Figure 7 In one modified embodiment of the present invention, the first positioning detection electrode 101 and a first electrode 12 have an equivalent mutual coupling capacitance Cm (i.e., mutual capacitance), and there is an electric field distribution between the first positioning detection electrode 101 and the first electrode 12. When an external finger touches or approaches the first positioning detection electrode 101 and the first electrode 12, due to the coupling capacitance between the human body and the ground, the finger absorbs part of the electric field emitted by the first electrode 12, reducing the electric field received by the first positioning detection electrode 101. A small current may flow through the first electrode 12 through the human body to the ground, and correspondingly, a small current may also flow through the first positioning detection electrode 101 through the human body to the ground, causing a change in the mutual coupling capacitance Cm. Similar to the calculation of the change in charge of capacitor C1 in the above embodiment, the touch detection circuit 110 can determine whether the first positioning detection electrode 101 has been touched by detecting the change in charge of the mutual coupling Cm. Similarly, the second positioning detection electrode 102 can also detect touch positioning by detecting the mutual coupling capacitance between itself and a first electrode 12.

[0064] Therefore, in the above embodiments and modified embodiments of the present invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 can be used for touch detection by self-capacitance, by mutual capacitance, or by a combination of both. The present invention does not limit this, and those skilled in the art will understand that all or part of the above embodiments, modifications, combinations, substitutions, extensions, etc., are within the protection scope of the present invention.

[0065] Please see Figure 8 This is a schematic diagram of a modified embodiment of the above embodiment. The structure and implementation principle of the touch display panel are basically the same as those of the touch display panel in the above embodiment. The difference is that the first positioning detection electrode 101, the second positioning detection electrode 102 and the second electrode layer are disposed on the same layer.

[0066] Please see Figure 9 This is a schematic diagram of a modified embodiment of the above embodiments. The structure and implementation principle of this touch display panel are basically the same as those of the touch display panel in the above embodiments, except that the first positioning detection electrode 101 and the second positioning detection electrode 102 are disposed in a separate layer on the first electrode layer. In this case, the first positioning detection electrode 101 and the second positioning detection electrode 102 are located between the glass cover plate 11 and the first electrode 12.

[0067] Please see Figure 10 This is a schematic diagram of a modified embodiment of the above embodiment. The structure and implementation principle of the touch display panel are basically the same as those of the touch display panel in the above embodiment. The difference is that it also includes a plurality of other positioning detection electrodes in a separate layer disposed between the first electrode layer and the glass cover plate 11.

[0068] This invention is not limited thereto. In other embodiments of this invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 may have other configurations. As long as the touch position can be detected and positioned in the extension direction of the first electrode 12, they are all within the scope of protection of this invention.

[0069] Please see Figure 11In another embodiment of the touch display panel of the present invention, the touch display panel includes a plurality of first electrodes 22 extending along a first direction, a plurality of second electrodes 24 extending along a second direction and overlapping with the first electrodes, a light-emitting layer (not shown) disposed between the first electrodes 22 and the second electrodes 24, a first positioning detection electrode 201 and a second positioning detection electrode 202 disposed on both sides of the first electrodes 22 and intersecting with the extension line of the first electrodes 22, a data driving circuit 220 connected to the first electrodes 22, a scanning driving circuit 230 connected to the second electrodes 24, and a touch detection circuit 210 connected to the first electrodes 22, the first positioning detection electrode 201, and the second positioning detection electrode 202. The first direction and the second direction intersect perpendicularly or non-perpendicularly. The touch detection circuit 210 is used to detect the capacitance changes of the first electrodes 22, the first positioning detection electrode 201, and the second positioning detection electrode 202 when the touch display panel is in touch detection mode, thereby locating the touch position of an external object (e.g., a finger). The data driving circuit 220 is used to provide current to the first electrodes 22. The scanning drive circuit 230 is connected to the second electrode 24 and is used to drive the second electrode 24 line by line, so that the second electrode 24 corresponding to the scan is grounded, thereby allowing current to flow between the second electrode 24 corresponding to the scan and the first electrode 22, while other unscanned second electrodes 24 are disconnected from ground and not connected to the first electrode 22. The light-emitting layer may include light-emitting elements that emit colors such as red, green, and blue, and the light-emitting elements will emit light electroluminescently when current flows through them. By repeating the above line-by-line scanning and display, when all the second electrodes 24 have been scanned, the touch display panel completes the display of one frame of image, and the touch display panel enters the touch detection mode from the display drive mode. The touch detection circuit 210 detects the change in self-capacitance of the first electrode 22, the first positioning detection electrode 201, and the second positioning detection electrode 202, and locates the touch position of an external object (e.g., a finger). The location includes confirming the coordinates of the touch position in the extension direction of the first electrode 22 and the coordinates perpendicular to the extension direction of the first electrode 22. After completing touch detection on the first electrode 22, the first positioning detection electrode 201, and the second positioning detection electrode 202, the touch display panel ends the touch detection mode and enters the display driving mode to continue displaying the next frame of the image. In fact, the first electrode 22 acts as a touch detection electrode during touch detection and as a display driving electrode during display driving.

[0070] The scan drive circuit 230 includes a scan signal generation circuit 231, a switching circuit 233, and a common voltage generation circuit 232. The scan signal generation circuit 231 is connected to the switching circuit 232. The common voltage generation circuit 232 is connected to the second electrode 24 via the switching circuit 232. The switching circuit 233 includes multiple switches (unlabeled), which can be three-terminal switching elements (e.g., field-effect transistors) including one control terminal and two on terminals. The scan signal generation circuit 231 is connected to the control terminal of the multiple switches and is used to generate and output a scan signal to the switches, which are then turned on or off under the control of the scan signal. The common voltage generation circuit 232 is connected to one on terminal of the multiple switches, and the other on terminal of the multiple switches is connected to the second electrode 24. The common voltage generation circuit 232 generates a common voltage (Vcom) and provides this common voltage to the corresponding connected second electrode 24 when the switch is on. The second electrode 24 is grounded when the corresponding connected switch is off. The scanning signal generation circuit 231 sequentially turns off the plurality of switches row by row, thereby grounding the second electrode 24 row by row. Furthermore, only one second electrode 24 is grounded at any given time. In this embodiment, the common voltage is a high-level voltage, for example, 8-15V. When the common voltage is applied to the second electrode 24, no current flows between the second electrode 24 and the plurality of first electrodes 22. When the second electrode 24 is grounded, a current path is formed between the second electrode 24 and the plurality of first electrodes 22, thereby enabling the light-emitting layer disposed between the first electrodes 22 and the second electrodes 24, especially the light-emitting layer corresponding to the overlapping positions of the plurality of first electrodes 22 and the second electrodes 24, to generate electroluminescence. The current provided by the data driving circuit 22 to the first electrodes 22 can be different, so the luminous intensity of the light-emitting layer corresponding to different overlapping positions of the first electrodes 22 and the second electrodes 24 can also be different.

[0071] The first positioning detection electrode 201 and the second positioning detection electrode 202 can be disposed on the same layer as the first electrode 22, or on the same layer as the second electrode 24, or on a separate layer above the first electrode 22. A protective layer (e.g., a glass cover) can also be disposed above the first electrode 22, allowing the user to perform touch control operations by touching the protective layer.

[0072] Please see Figure 12In another embodiment of the touch display panel of the present invention, it includes a plurality of first electrodes 32 extending along a first direction, a plurality of second electrodes 34 extending along a second direction and overlapping the first electrodes, a light-emitting layer (not shown) disposed between the first electrodes 32 and the second electrodes 34, a first positioning detection electrode 301 and a second positioning detection electrode 302 disposed on both sides of the second electrodes 34 and intersecting with the extension lines of the second electrodes 34, a data driving circuit 320 connected to the first electrodes 32, a scanning driving circuit 330 connected to the second electrodes 34, and a touch detection circuit 310 connected to the second electrodes 34, the first positioning detection electrode 301, and the second positioning detection electrode 302. The first direction and the second direction intersect perpendicularly or non-perpendicularly. The touch detection circuit 310 is used to detect changes in the self-capacitance of the second electrodes 34, the first positioning detection electrode 301, and the second positioning detection electrode 302 when the touch display panel is in touch detection mode, thereby locating the touch position of an external object (e.g., a finger). The data driving circuit 320 is used to provide current to the first electrodes 32. The scanning drive circuit 330 is connected to the second electrode 34 and is used to drive the second electrode 34 line by line, so that the second electrode 34 corresponding to the scan is grounded, thereby allowing current to flow between the second electrode 34 corresponding to the scan and the first electrode 32, while other unscanned second electrodes 34 are disconnected from ground and not connected to the first electrode 32. The light-emitting layer may include light-emitting elements that emit colors such as red, green, and blue, and the light-emitting elements will emit light electroluminescently when current flows through them. By repeating the above line-by-line scanning and display, when all the second electrodes 34 have been scanned, the touch display panel completes the display of one frame of image, and the touch display panel enters the touch detection mode from the display drive mode. The touch detection circuit 310 detects the change in self-capacitance of the second electrode 34 and the first positioning detection electrode 301 and the second positioning detection electrode 302, and locates the touch position of an external object (e.g., a finger). The location includes confirming the coordinates of the touch position in the extension direction of the second electrode 34 and the coordinates perpendicular to the extension direction of the second electrode 34. After completing touch detection on the second electrode 34, the first positioning detection electrode 301, and the second positioning detection electrode 302, the touch display panel ends the touch detection mode and enters the display driving mode to continue displaying the next frame of image. In fact, the second electrode 34 acts as a touch detection electrode during touch detection and as a display driving electrode during display driving.

[0073] The scan drive circuit 330 includes a scan signal generation circuit 331, a switching circuit 333, and a common voltage generation circuit 332. The scan signal generation circuit 331 is connected to the switching circuit 332. The common voltage generation circuit 332 is connected to the second electrode 34 via the switching circuit 332. The switching circuit 333 includes multiple switches (unlabeled), each switch being a three-terminal switching element (e.g., a field-effect transistor) with one control terminal and two on terminals. The scan signal generation circuit 331 is connected to the control terminal of the multiple switches, used to generate and output a scan signal to the switches, which are then turned on or off under the control of the scan signal. The common voltage generation circuit 332 is connected to one on terminal of the multiple switches, and the other on terminal of the multiple switches is connected to the second electrode 34. The common voltage generation circuit 332 generates a common voltage and provides this common voltage to the corresponding connected second electrode 34 when the switch is on. The second electrode 34 is grounded when the corresponding connected switch is off. The scan signal generation circuit 331 turns off the multiple switches row by row, thereby grounding the second electrode 34 row by row. Furthermore, the scanning signal generation circuit 331 ensures that only one of the second electrodes 34 is grounded at any given time. When the common voltage is applied to the second electrode 34, no current flows between the second electrode 34 and the plurality of first electrodes 32. When the second electrode 34 is grounded, a current path is formed between the second electrode 34 and the plurality of first electrodes 32, thereby enabling the light-emitting layer disposed between the first electrodes 32 and the second electrodes 34, especially the light-emitting layer corresponding to the overlapping positions of the plurality of first electrodes 32 and the second electrodes 34, to generate electroluminescence. The current provided by the data driving circuit 32 to the first electrode 32 can be different, so the luminous brightness of the light-emitting layer corresponding to different overlapping positions of the first electrodes 32 and the second electrodes 34 can also be different. The first positioning detection electrode 301 and the second positioning detection electrode 302 can be disposed on the layer where the first electrode 32 is located, or on the layer where the second electrode 34 is located, or on a separate layer above the first electrode 32.

[0074] Please see Figure 13In another embodiment of the touch display panel of the present invention, the touch display panel includes a plurality of first electrodes 42 extending along a first direction, a plurality of second electrodes 44 extending along a second direction and overlapping the first electrodes, a first positioning detection electrode 401 and a second positioning detection electrode 402 disposed on both sides of the first electrodes 42 and intersecting the extension lines of the first electrodes 42, a data driving circuit 420 connected to the first electrodes 42, a scanning driving circuit 430 connected to the second electrodes 44, and a touch detection circuit 410 connected to the first electrodes 42, the first positioning detection electrode 401, and the second positioning detection electrode 402. The first direction and the second direction may be perpendicular or not perpendicular. The touch detection circuit 410 is used to detect the capacitance changes of the first electrodes 42, the first positioning detection electrode 401, and the second positioning detection electrode 402 when the touch display panel is in touch detection mode, thereby locating the touch position of an external object (e.g., a finger). The data driving circuit 420 is used to provide current to the first electrodes 42. The scanning drive circuit 430 is connected to the second electrode 44 and is used to drive the second electrode 44 line by line, so that the second electrode 44 corresponding to the scan is grounded, thereby allowing current to flow between the second electrode 44 corresponding to the scan and the first electrode 42, while other unscanned second electrodes 44 are disconnected from ground and not connected to the first electrode 42. By repeating the above line-by-line scanning and display, when all the second electrodes 44 have been scanned, the touch display panel completes the scanning of one frame of image, and the touch display panel enters the touch detection mode from the display drive mode. The touch detection circuit 410 detects the change in self-capacitance of the first electrode 42, the first positioning detection electrode 401, and the second positioning detection electrode 402, and locates the touch position of an external object (e.g., a finger). The location includes confirming the coordinates of the touch position in the extension direction of the first electrode 42 and the coordinates perpendicular to the extension direction of the first electrode 42. After completing the touch detection of the first electrode 22, the first positioning detection electrode 401, and the second positioning detection electrode 402, the touch display panel ends the touch detection mode, enters the display drive mode, and continues to display the next frame of image. In fact, the first electrode 42 serves as a touch detection electrode during touch detection and as a display driving electrode during display driving.

[0075] The first positioning detection electrode 401 and the second positioning detection electrode 402 can be disposed on the same layer as the first electrode 42, or on the same layer as the second electrode 44, or on a separate layer above the first electrode 42. A protective layer (e.g., a glass cover) can also be disposed above the first electrode 42, allowing the user to perform touch control operations by touching the protective layer. This invention does not specifically limit the layer position of the first positioning detection electrode 401 and the second positioning detection electrode 402.

[0076] The touch detection circuit 410 includes an amplification module 411, an analog-to-digital converter 412, a processor 413, a multiplexer 414, a control unit 415, a charging module 416, a first switch K1, and a second switch K2. The multiplexer 414 includes a first input / output terminal and a second input / output terminal capable of signal input and output. The plurality of first electrodes 42, the first positioning detection electrode 401, and the second positioning detection electrode 402 are connected to the first input / output terminal of the multiplexer 414. The charging module 416 is connected to one conducting terminal of the first switch K1, and the other conducting terminal of the first switch K1 is connected to the second input / output terminal of the multiplexer 414. The second input / output terminal of the multiplexer 414 is further connected to the amplification module 411 through the two conducting terminals of the second switch K2. The amplification module 412 is connected to the analog-to-digital converter 412, and the analog-to-digital converter 412 is connected to the processor 413. The control unit 415 is connected to the control terminals of the first switch K1 and the second switch K2, respectively. For example, but not limited to, the first switch K1 and the second switch K2 are three-terminal switching elements including a control terminal and two conducting terminals, and the two conducting terminals can be turned on or off by applying a high level or a low level to the control terminal.

[0077] In this embodiment, the control unit 415 can provide square wave pulses or sine wave pulse signals to control the first switch K1 and the second switch K2 to be turned on or off. The first switch K1 and the second switch K2 can be NMOS transistors and PMOS transistors, respectively. By reasonably setting the control signal output by the control unit 415, the first switch K1 and the second switch K2 will never be turned on or off simultaneously. The multiplexer 414 divides the first electrode 42, the first positioning detection electrode 401, and the second positioning detection electrode 402 into multiple detection channels (or channels). Each detection channel includes multiple first electrodes 42 and / or first positioning detection electrodes 401 and second positioning detection electrodes 402, and each detection channel corresponds to a different amplification module 411. The operation of this touch detection circuit is described below using one detection channel as an example.

[0078] When the touch display panel is in touch detection mode, the control unit 415 sends pulse control signals to the first switch K1 and the second switch K2. When the first switch K1 is on and the second switch K2 is off, the charging module 416 charges the touch detection capacitors of the first electrode 42, the first positioning detection electrode 401, and the second positioning detection electrode 402 through the multiplexer 414. Specifically, the charging module 416 charges the parasitic capacitance (i.e., self-capacitance) formed by the first electrode 42 or the first positioning detection electrode 401 and the second positioning detection electrode 402 connected to and grounded for touch detection. When the first switch K1 is off and the second switch K2 is on, the touch detection capacitor discharges through the multiplexer 414, and a portion of the charge on the touch detection capacitor is transferred to the capacitor in the amplification module 411. As the first switch K1 and the second switch K2 are continuously turned on and off, the amplification module 411 amplifies the pulse signal generated by the charging and discharging of the touch detection capacitor and generates a corresponding amplified capacitor output signal. The analog-to-digital converter converts the voltage signal output by the amplification module into a digital signal and outputs it to the processor 413. The processor 413 performs touch detection positioning processing based on the digital signal output by the analog-to-digital converter 412. The charging module 416 can be a power supply module or other voltage output circuit, and the output voltage of the charging module 416 can be 5V, or 3V, 8V, 10V, 15V, etc., which is not specifically limited in this invention.

[0079] In some modified embodiments of the above embodiments, the multiplexer 414 may be omitted, and the first electrode 42 and positioning electrodes 401 and 402 for touch detection may be directly connected to the corresponding first switch K1 and second switch K2, and then connected to the charging module 416 and the amplification module 411.

[0080] Please see Figure 14 The present invention also provides a touch detection method, the touch detection method comprising:

[0081] Step S1: Provide a plurality of first electrodes having a first extending direction and two positioning detection electrodes disposed on both sides of the first electrodes and intersecting the extension line of the first electrodes;

[0082] Step S2: Determine the coordinates of the touch position in the direction intersecting with the extension direction of the first electrode by detecting the self-capacitance of the first electrode.

[0083] Step S3: Determine the coordinates of the touch position in the extension direction of the first electrode by detecting the self-capacitance of the positioning detection electrode.

[0084] In a further embodiment, the touch detection method may further include: providing a plurality of second electrodes having a second extending direction and overlapping with the first electrode and a light-emitting layer disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode together constitute a display area, and the first electrode and the positioning detection electrode together constitute a touch detection area.

[0085] In a further embodiment, the touch detection method may further include dividing the touch detection area into multiple touch button areas, and displaying a user interface adjacent to the positioning detection electrode in the multiple button areas.

[0086] The present invention also provides an electronic device, which may include any or a combination of the above embodiments of a touch display panel or employ the touch detection method described in the above embodiments. The electronic device may be a mobile phone, tablet computer, laptop computer, e-book, smart watch, augmented reality / virtual reality device, human motion detection device, autonomous vehicle, smart home device, security device, smart robot, or other device or apparatus with human-computer interaction function.

[0087] Compared to existing technologies, this invention provides positioning detection electrodes on both sides of a first electrode. The first electrode and the positioning detection electrodes (including a first positioning electrode and a second positioning electrode) can detect touch actions. The first electrode can locate the touch position in the direction intersecting its extension direction, and the positioning detection electrodes can locate the touch position in the extension direction of the first electrode. This allows for positioning the coordinates of the touch position from two different directions, achieving two-dimensional touch positioning and overcoming the technical problem of existing PMOLED touch display panels that only have single-directional touch detection. Furthermore, by configuring a user interface with the first and second positioning detection electrodes adjacent to each other, this invention allows the touch position to overlap with the first electrode and the first positioning detection electrode, or the first and second positioning detection electrodes, when the user performs a touch action. This enables the determination of the two-dimensional coordinate direction of the touch position by detecting the self-capacitance or changes of the first electrode and the first and second positioning detection electrodes, or the mutual capacitance or changes between the first and second positioning detection electrodes and the first electrode. This invention's touch detection method can be used in the aforementioned touch display panels, thus providing a better user experience for the touch detection method, touch detection circuit, touch display panel, and electronic device.

[0088] The terms "length," "width," "upper," "lower," "front," "rear," "back," "front," "vertical," "horizontal," "top," "bottom," "inner," and "outer" that may appear in this specification indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings. These are used solely for the convenience of describing embodiments of the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Similar reference numerals and letters in the drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "multiple" means at least two, and "a plurality of" means at least two, unless otherwise explicitly specified. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0089] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The terminology used in the claims should not be construed as limiting the invention to the specific embodiments disclosed in this specification. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A touch detection method applied to a touch display panel, characterized in that, The touch display panel is a PMOLED panel, The touch display panel comprises a plurality of first electrodes with a first extension direction, two positioning detection electrodes arranged on both sides of the first electrodes and intersecting the extension line of the first electrodes; The touch detection method comprises: determining the coordinate of the touch position in the direction intersecting the extension direction of the first electrode by detecting the self-capacitance of the first electrode; and determining the coordinate of the touch position in the extension direction of the first electrode by detecting the self-capacitance of the positioning detection electrode or the mutual capacitance between the positioning detection electrode and the first electrode.

2. The touch detection method according to claim 1, characterized in that, Further comprising providing a plurality of second electrodes with a second extension direction and mutually overlapping the first electrodes, and a light-emitting layer arranged between the first electrodes and the second electrodes, the first electrodes and the second electrodes jointly constituting a display area, and the first electrodes and the positioning detection electrodes jointly constituting a touch detection area.

3. The touch detection method according to claim 2, characterized in that, Further comprising dividing the touch detection area into a plurality of touch key areas, and displaying a user interface adjacent to the positioning detection electrodes in the plurality of touch key areas.

4. The touch detection method of claim 2, wherein, The first electrodes constitute a first electrode layer, the second electrodes constitute a second electrode layer, the positioning detection electrodes are arranged in the same layer as the first electrodes, or the positioning detection electrodes are arranged in the same layer as the second electrodes, or the positioning detection electrodes are arranged in a separate layer on the first electrodes.

5. The touch detection method of claim 2, wherein, Further comprising providing a touch detection circuit, which is used for detecting the self-capacitance of the first electrodes, and detecting the self-capacitance of the positioning detection electrodes or the mutual capacitance between the positioning detection electrodes and the first electrodes.

6. The touch detection method of claim 4, wherein, The first electrode layer and the second electrode layer are ITO layers or composite layers of ITO / Ag / ITO structure, or the first electrode layer and the second electrode layer are made of opaque conductive materials.

7. The touch detection method of claim 5, wherein, The touch detection circuit comprises an amplification module, an analog-to-digital converter and a processor, the amplification module receives the charge change of the self-capacitance of the first electrodes and the positioning detection electrodes and outputs corresponding amplified touch detection voltage to the analog-to-digital converter, the analog-to-digital converter outputs digital signals to the processor according to the analog touch detection voltage signals, and the processor obtains the touch detection results after signal processing.

8. A touch detection circuit, characterized by The touch detection circuit adopts the touch detection method according to any one of claims 1-7.

9. A touch display panel, characterized by, The touch display panel adopts the touch detection method according to any one of claims 1-7, or comprises the touch detection circuit according to claim 8.

10. An electronic device, comprising: The electronic device adopts the touch detection method according to any one of claims 1-7, or comprises the touch display panel according to claim 9.

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