CN109857285B

CN109857285B - Touch display panel, touch detection circuit, display device, and electronic apparatus

Info

Publication number: CN109857285B
Application number: CN201910218233.1A
Authority: CN
Inventors: 王洁
Original assignee: Shenzhen Xihua Technology Co Ltd
Current assignee: Shenzhen Xihua Technology Co Ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2024-03-19
Anticipated expiration: 2039-03-21
Also published as: CN109857285A

Abstract

The invention discloses a touch detection circuit which is used for detecting a plurality of first electrodes with a first extending direction and a PMOLED panel which is arranged on two sides of the first electrodes and is provided with positioning detection electrodes intersecting with extension lines of the first electrodes. The invention also discloses a touch display panel comprising the touch detection circuit, a display device and electronic equipment. The invention has better user experience.

Description

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

Technical Field

The present invention relates to the field of electronic technologies, and in particular, to a touch display panel, a touch detection circuit, a display device, and an electronic apparatus with good user experience.

Background

With the development of technology and the improvement of living standard of people, display devices including mobile phones, tablet computers, wearable digital products and the like are increasingly used.

An Organic Light-Emitting Diode (OLED) display technology is a technology that uses a reversible color change generated by an Organic semiconductor material under the driving of a current to realize display. The OLED has advantages of light weight, thin thickness, low power consumption, high contrast ratio, and flexible display, and thus the OLED display technology is considered as a new generation display technology with the most development prospect. The OLED display technology can be classified into Passive Matrix Organic Light Emitting Diode (PMOLED) and Active Matrix Organic Light Emitting Diode (AMOLED) display technologies according to driving modes. Currently, PMOLED display panels are widely used in small-sized electronic devices, such as watches, players, and the like.

Touch detection and control can be achieved by adding touch detection electrodes and detection chips to an OLED display panel, which is also commonly referred to as a touch display panel. However, because of arrangement of electrodes of the PMOLED display panel, a problem of touch positioning occurs when using the PMOLED electrodes as a touch sensor, and the two-dimensional positioning cannot be realized only by detecting in one dimension, so that the user experience is poor.

Disclosure of Invention

The invention aims to provide a touch display panel, a touch detection circuit, a display device and an electronic device with better user experience.

One aspect of the present invention discloses a touch detection circuit for detecting self capacitances of a plurality of first electrodes having a certain extending direction and positioning detection electrodes disposed on both sides of the first electrodes and intersecting with extension lines of the first electrodes, the touch detection circuit determining coordinates of a touch position in a direction intersecting with the extending direction of the first electrodes by detecting the self capacitance of the first electrodes, and determining 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 of the positioning detection electrodes and the first electrodes.

Optionally, the touch detection circuit includes an amplifying module, an analog-to-digital converter and a processor, where the amplifying module receives charge changes of self-capacitances of the first electrode and the positioning detection electrode and outputs a corresponding amplified touch detection voltage to the analog-to-digital converter, and the analog-to-digital converter outputs a digital signal to the processor according to an analog touch detection voltage signal, and the processor performs signal processing to obtain a touch detection result.

Optionally, the self-capacitance of the first electrode and the positioning detection electrode is a touch detection capacitance, the amplifying module includes a first switch, a second switch, a resistor, a third switch, an amplifying capacitance and an amplifier, a high level voltage is connected to one end of the touch detection capacitance through the first switch, the other end of the touch detection capacitance is grounded, one end of the touch detection capacitance is connected to the first switch and is also connected to the positive input end of the amplifier through the second switch and the resistor, the output end of the amplifier is connected to the positive input end of the amplifier through the amplifying capacitance, the negative input end of the amplifier is grounded, and the third switch is connected between the output end and the positive input end of the amplifier in parallel with the two ends of the amplifying capacitance.

Optionally, the touch detection circuit includes an amplifying module, an analog-to-digital converter, a processor, a multiplexer, a control unit, a charging module, a first switch and a second switch, and the multiplexer includes a first input/output terminal and a second input/output terminal that can be used for signal input and output. The first electrodes and the two positioning detection electrodes are connected with a first input/output end of the multiplexer, the charging module is connected with one conducting end of the first switch, the other conducting end of the first switch is connected with a second input/output end of the multiplexer, the second input/output end of the multiplexer is further connected with the amplifying module through two conducting ends of the second switch, the amplifying module is connected with the analog-to-digital converter, the analog-to-digital converter is connected with the processor, and the control unit is respectively connected with the control ends of the first switch and the second switch.

Optionally, the control unit can provide square wave pulse or sine wave pulse signals to control the first switch and the second switch to be turned on or off, and the first switch and the second switch cannot be turned on or off simultaneously, the multiplexer divides the first electrode and the two positioning detection electrodes into a plurality of detection channels, each detection channel comprises a plurality of first electrodes and/or first positioning detection electrodes and second positioning detection electrodes, and each detection channel corresponds to a different amplifying module.

Alternatively, the touch detection circuit detects the coordinates of the touch position in the direction intersecting the extending direction thereof by detecting the self capacitance of the first electrode, and the touch detection circuit detects the coordinates of the touch position in the extending direction of the first electrode by detecting the self capacitance of the two positioning detection electrodes or the mutual capacitance of the two positioning detection electrodes and the first electrode.

Optionally, the touch detection circuit is used for a touch display panel capable of performing display driving and touch detection in a time-sharing manner, and the touch detection circuit is used for detecting a two-dimensional touch position on the touch display panel in a touch detection stage.

An aspect of the present invention also discloses a touch display panel including the above touch detection circuit, the touch display panel including a plurality of first electrodes extending in a first direction, a plurality of second electrodes extending in a second direction and overlapping the first electrodes, two positioning detection electrodes disposed at both sides of the first electrodes and intersecting with extension lines of the first electrodes, the first and second electrodes being capable of being used for display driving, and the first and two positioning detection electrodes being capable of being used for touch detection.

Optionally, the first electrode forms a first electrode layer, the second electrode forms a second electrode layer, the two positioning detection electrodes and the first electrode are arranged on the same layer, or the two positioning detection electrodes and the second electrode are arranged on the same layer, or the two positioning detection electrodes are arranged on a single layer on the first electrode, the first electrode is used for detecting coordinates of a touch position in a direction intersecting with an extending direction of the first electrode, the two positioning detection electrodes are used for detecting coordinates of the touch position at two ends of the first electrode in the extending direction, and the touch display panel is a PMOLED touch display panel.

One aspect of the invention also discloses a display device comprising the touch detection circuit and/or the touch display panel.

The invention also discloses an electronic device which comprises the display device, wherein the electronic device is one of a mobile phone, a tablet personal computer, a notebook computer, an electronic book, an electronic watch, an augmented reality/virtual reality device, a human body motion detection device, an automatic driving automobile, an intelligent household device, a security device and an intelligent robot.

Compared with the prior art, the touch display panel comprises the positioning detection electrodes arranged on two sides of the first electrode, the first electrode can be used for detecting touch actions with the positioning detection electrodes comprising the first positioning electrode and the second positioning electrode, the first electrode can position a touch position in a direction intersecting with the extending direction of the first electrode, and the positioning detection electrode can position the touch position in the extending direction of the first electrode, so that two-dimensional touch positioning is realized, and the technical problem that the touch display panel of the PMOLED in the prior art only has single-direction touch detection is solved. In addition, the touch display panel of the invention enables the touch position and the first electrode and the first positioning detection electrode or the first electrode and the second positioning detection electrode to overlap when a user performs a touch action by configuring the user interface with the first positioning detection electrode and the second positioning detection electrode which are adjacent to each other, so that the two-dimensional coordinate direction of the touch position can be determined by detecting the self capacitance of the first electrode and the first positioning detection electrode and the self capacitance of the second positioning detection electrode. The touch detection circuit is used for the touch display panel, and the electronic equipment comprises the touch display panel or the touch detection circuit. Therefore, the touch display panel, the touch detection circuit and the electronic equipment have better user experience.

Drawings

FIG. 1 is a schematic diagram of one embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the embodiment shown in FIG. 1;

FIG. 3 is a schematic block diagram of the circuit of the embodiment shown in FIG. 1;

FIG. 4 is a partial signal diagram of the embodiment of FIG. 1;

FIG. 5 is a schematic view of a touch detection area of one embodiment of the invention;

FIG. 6 is a schematic diagram of a touch detection circuit of one embodiment of the present invention;

FIG. 7 is a schematic circuit diagram of an embodiment of the invention

FIG. 8 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of one embodiment of the invention;

FIG. 10 is a schematic cross-sectional view of an embodiment of the present invention;

FIG. 11 is a circuit block schematic of an embodiment of the present invention;

FIG. 12 is a circuit block schematic of an embodiment of the invention;

fig. 13 is a schematic block circuit diagram of an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The features, structures described in this document may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the present application. It will be appreciated, however, by one skilled in the art that the subject matter of the present application may be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring aspects of the application.

Currently, capacitive touch technologies are classified into surface capacitive type and projected capacitive type, and the projected capacitive type is classified into two implementation modes of Self-Capacitance type and mutual Capacitance type (Mutual Capacitance) according to a detection method. An electrode array which is transversely and longitudinally staggered is manufactured on the surface of the glass substrate by using a transparent conductive material, and the transverse electrode and the longitudinal electrode respectively form a capacitor with the ground. This capacitance is known as self-capacitance, i.e. the capacitance of the electrode to ground. A display panel having a touch detection function is also called a touch display panel, or a touch screen.

For the self-capacitance type touch display panel, when a human body does not touch a touch detection area of the panel, the capacitance born by each capacitance electrode is a fixed value, and when the human body touches the screen, the corresponding capacitance born by the self-capacitance electrode is a fixed value, the human body capacitance is overlapped, and the touch position can be judged by detecting the capacitance value change of each capacitance electrode. The basic principle is a charge-discharge circuit which is charged and discharged continuously. When a finger or other object touches the panel area, the self-capacitance of the electrode corresponding to the touch area is changed, so that charge and discharge charges are changed, and the output voltage corresponding to the amplifier is also changed. The touch detection function is realized by calculating the change of charge and discharge charge or output voltage.

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 comprises a plurality of first electrodes extending in a first direction, and the second electrode layer comprises a plurality of second electrodes extending in a second direction. The first electrode layer may further be provided with a glass cover plate or glass substrate for protection.

In this embodiment, the first electrode and the second electrode are stripe electrodes, and the first direction and the second direction are perpendicular to each other. The light-emitting layer is an organic electroluminescent layer (electroluminescent layer, EL layer) that emits light when a current flows through the light-emitting layer. Each overlapping of the first and second electrodes may be regarded as a pixel, and by supplying a current to the first and second electrodes, a current may be caused to flow through the first and second electrodes to address and activate the pixel. The touch display panel can excite the light-emitting layer at different positions, so that the light-emitting layer emits light or does not emit light at pixel points at different positions.

In this embodiment, the first electrode layer and the second electrode layer may be made of a material having good conductivity and light transmittance, for example, a transparent conductive oxide such as indium tin oxide (Indium Tin Oxides, ITO). The first electrode layer and the second electrode layer may also have a multilayer structure such as a composite layer of ITO/Ag/ITO. Of course, in other modified embodiments of the present invention, the first electrode layer and the second electrode layer may also be made of opaque conductive materials, which is not limited by the present invention.

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

The touch display panel is connected with the display driving chip and the touch detection chip, and the display driving chip and the touch detection chip can be independent two chips or integrated into one chip, for example, integrated into one chip by touch control and display driver integration (Touch and Display Driver Integration, TDDI) technology. The display driving chip and the touch detection chip may be sometimes referred to as a display driving circuit and a touch detection circuit.

The display driving circuit includes a scan driving circuit for scanning the plurality of second electrodes line by line, and a data driving circuit for simultaneously supplying a current required for light emission to the plurality of first electrodes. In a frame image display time, only one of the plurality of second electrodes is short-circuited to the ground terminal at the same time, and the other second electrodes are disconnected from the ground terminal and supplied with a high-level common voltage (Vcom); the plurality of first electrodes are simultaneously supplied with current such that the current flows through the first electrodes and the grounded second electrodes, whereby the light emitting layer is capable of emitting light at the pixel point corresponding to the grounded first electrodes. And repeating the process on the second electrodes one by one until all the second electrodes are scanned, and completing the display of one frame of picture. For example, but not limited to, the touch display panel has a refresh rate of 100Hz, then each frame should complete the scan of the second electrode within 10 ms. The first electrode may also be referred to as a column electrode or SEG electrode, the second electrode may also be referred to as a row electrode or COM electrode, the scan driving circuit may also be referred to as a row driving circuit, and the data driving circuit may also be referred to as a column driving circuit. In some variations of the invention, the first electrode COM electrode and the second electrode are SEG electrodes. The ground terminal may be a ground terminal, a device ground terminal, or other ground terminal defined according to need, which is to be understood in a broad sense in the present invention, and is not particularly limited.

In this embodiment, in order to implement the touch detection function, the first electrode of the touch display panel may be multiplexed as a touch detection electrode, and a touch detection circuit connected to the first electrode detects a change in self capacitance of the first electrode, so that a position where an external object (for example, a finger) touches the touch display panel can be detected, thereby implementing touch detection. In the touch detection, if a user's finger touches the glass cover plate adjacent to the first electrode, parasitic capacitance is formed between the finger and the first electrode due to the electrification of the human body, and the self-capacitance of the first electrode corresponding to the finger touch range increases. The self-capacitance change causes a change in charge and discharge of the touch detection circuit, and the processor can calculate the self-capacitance size according to the charge and discharge amount or calculate the self-capacitance size according to the pulse voltage value. The touch detection circuit can determine the first electrode with the corresponding self-capacitance changed by detecting the voltage change value of the pulse signal or the charge-discharge charge change amount on the first electrode, so that the touch position can be determined. That is, the position or coordinates of the touch position of the finger in the direction intersecting or not intersecting perpendicularly with the extending direction of the first electrode can be confirmed by the first electrode.

Of course, in a modified embodiment of the present invention, the second electrode may be multiplexed as the touch detection electrode.

In order to confirm the position of the finger touch position in the extending direction of the first electrode at the time of touch detection, the touch display panel may further include a plurality of positioning detection electrodes, which are stripe-shaped electrodes having an extending direction that is not coincident with the extending direction of the first electrode. Such as, but not limited to: the extending direction of the positioning detection electrode is perpendicular to the extending direction of the first electrode. Since the extending direction of the first electrode is the first direction, and the extending direction of the second electrode is the second direction, when the second direction is perpendicular to the first direction, the extending direction of the positioning detection electrode is consistent with the second direction. The positioning detection electrode is used only for touch detection and not for display driving, and can be used for detecting the position of the touch position of the finger on the glass cover plate in the extending direction of the first electrode. The positioning detection electrode is connected with the touch detection circuit, and can be connected with the scanning driving circuit or not connected with the scanning driving circuit. The positioning detection electrode can be arranged on the same layer as the first electrode layer, or arranged on the first electrode layer through an insulating layer, or arranged on the same layer as the second electrode layer.

The first electrodes and the second electrodes overlap to form a grid distribution, and the overlapping position of the first electrodes and the second electrodes can be regarded as a pixel point, and the pixel points form a display area of the touch display panel, so that the first electrodes and the second electrodes together form the display area of the touch display panel. At the same time, the first electrode is also multiplexed as a touch detection electrode at the time of touch detection, so the plurality of first electrodes and the positioning detection electrode together constitute a touch detection area of the touch display panel.

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

In this embodiment, the touch detection and display driving are performed in a time-sharing manner, that is: at one time, the touch display panel is either in a display stage or in a touch detection stage, without simultaneously performing display driving and touch detection. For example, the touch detection circuit detects a change in self capacitance of the first electrode after the image display of each frame is completed. Accordingly, the first electrode and the second electrode can be used for display driving, the first electrode and the two positioning detection electrodes can be used for touch detection, the first electrode can be used for detecting coordinates of a touch position in a direction intersecting with an extending direction thereof, and the two positioning detection electrodes can be used for detecting coordinates of a touch position in the extending direction of the first electrode, and in the above embodiment, coordinates of both ends of the touch position in the extending direction of the first electrode can be used for detection.

It should be noted that other words for describing the first electrode, etc. for touch detection may appear in the present specification, for example, but not limited to: a touch detection electrode, or a self-capacitance detection electrode, or a detection electrode, etc., can be understood by those skilled in the art as equivalent to the first electrode of the present invention. For convenience of description, the first electrode and the position detection electrode may be collectively referred to as a touch detection electrode when used for touch detection. In addition, the words "first", "second", "row", "column", and the like in the description of the present invention are merely for convenience of understanding and do not represent any specific limitation.

The touch display panel is a PMOLED display panel with a touch detection function, and when light beams are emitted from one side of an OLED substrate, the PMOLED display panel is a bottom-light-emitting display panel; when the light beam exits from one side far away from the substrate, the PMOLED display panel is a top-light-emitting display panel; when light beams are emitted from one side of the OLED substrate and one side of the PMOLED display panel far away from the substrate, the PMOLED display panel is a double-sided light-emitting display panel.

Furthermore, it should be noted that, although the embodiments of the present application are described schematically with reference to a Touch display panel, the Touch display panel of the present invention may be used in other embodiments where image display is not required, such as a Touch Pad (Touch Pad) for a notebook computer, where the first electrode layer and the second electrode layer do not need to be transparent, and the glass substrate for protection may be replaced by other materials.

Referring to fig. 1, in one embodiment of the present invention, a touch display panel includes a first electrode layer (not numbered) formed of a plurality of first electrodes 12 extending in a first direction, a second electrode layer (not numbered) opposite to the first electrode layer formed of a plurality of second electrodes 14 extending in a second direction and disposed to overlap the first electrodes 12, a light emitting layer 13 disposed between the first and second electrode layers, a glass cover plate 11 disposed on the first electrode layer, and first and second positioning detection electrodes 101 and 102 disposed on both sides of the first electrodes 12 and perpendicularly intersecting extension lines of the first electrodes 12 or the first electrodes 12. The first electrode 12 and the second electrode 14 are not directly connected but are arranged in a staggered and overlapping manner. In this embodiment, for example and without limitation, the first electrodes 12 are parallel to each other, and the second electrodes 14 are parallel to each other and perpendicular to the second electrodes 12. The first electrode layer is located above the second electrode layer. Above the glass cover plate 11, a user can see an image display and perform touch control on the upper surface of the glass cover plate 11. The extended lines of the first electrode 12 include an extended line in the extending direction of the first electrode 12 and an extended line in the opposite direction to the extending direction of the first electrode 12.

Referring to fig. 2, the first positioning detecting electrode 101 and the second positioning detecting electrode 102 are disposed on the same layer as the first electrode 12. In other embodiments of the present invention, the first positioning detecting electrode 101 and the second positioning detecting electrode 102 may be disposed on the same layer as the second electrode 14, or may be disposed on a single layer on the first electrode layer, which is not limited by the present invention. The light emitting layer 13 includes an electroluminescent layer composed of an organic molecular thin film, such as but not limited to: OLED stack layers. The first electrode 12 is an anode and the second electrode 14 is a cathode, the first electrode 12 and the second electrode 14 being capable of providing current to the light emitting layer 13 and receiving current from the light emitting layer 13, respectively.

Referring to fig. 3, the 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 configured to detect a change in self capacitance of the first electrode 12, the first positioning detection electrode 101 and the second positioning detection electrode 102. The data driving circuit 120 is connected to the first electrode 12 for supplying current to the first electrode 12. The scan driving circuit 130 is connected to the second electrode 14, and is used for driving the second electrode 14 in a progressive scan manner, so that the second electrode 14 corresponding to the scan is grounded, and thus, current passes between the second electrode 14 corresponding to the scan and the first electrode 12, and other second electrodes 14 not being scanned are disconnected and grounded and are not conducted with the first electrode 12. By repeating such progressive scanning and progressive display, one frame of image display is completed. During an interval of each frame image display, the touch display panel is in a 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 scan driving circuit 130 supplies a high-level common voltage to the second electrode 14, the touch detection circuit 110 causes self capacitances of the first electrode 12, the first positioning detection electrode 101 and the second positioning detection electrode 102 to be charged, discharged and detects a charge amount signal or a detection coupling voltage signal, and by further processing of the charge amount signal or the coupling voltage signal, a touch action of an external object (e.g., a finger) on the touch display panel and detection of a touch position are realized.

The plurality of first electrodes 12 and the plurality of second electrodes 14 overlap to form a grid distribution, and the overlapping portion of the first electrodes 12 and the second electrodes 14 may be regarded as one pixel, and the plurality of pixels form a display area of the touch display panel, so that the first electrodes 12 and the second electrodes 14 together form the display area of the touch display panel. At this time, the first electrodes 12 are multiplexed as touch detection electrodes at the time of touch detection, and therefore the plurality of first electrodes 12 and the first and second positioning detection electrodes 101 and 102 together constitute a touch detection area of the touch display panel. It is obvious that the first electrode 12 and the self capacitance of the first positioning detection electrode 101 or the second positioning detection electrode 102 at the touch position are affected by the finger of the user during touch detection, and the finger size is significantly larger than the widths of the first electrode 12, the first positioning detection electrode and the second positioning detection electrode 102, so that the resolution of the touch area for touch detection is not as high as that of the display area. Thus, the first electrode 12 may be divided into several detection channels at the time of touch detection, each detection channel comprising a certain number of first electrodes 12. The signal of each detection channel is input to the touch detection circuit 110 after being connected in parallel. In this embodiment, the touch detection circuit 110 may include an amplifying module, and the amplifying module may include a plurality of amplifiers respectively connected to the first electrode, the first positioning detection electrode, and the second positioning detection electrode, or a part of the plurality of electrodes may be connected to one amplifier through a switch, or charge and discharge amount signals of the plurality of electrodes may be summed by an adder and input to one amplifier.

Referring to fig. 4, the number of the second electrodes 14 of the touch display panel is assumed to be n. Gl1 to gln (n is a positive integer) in fig. 4 represent scanning signals applied to n second electrodes 14, respectively. In the display stage, the touch display panel is in a display driving mode, and the n second electrodes 14 are sequentially grounded under the scanning driving of the scanning signals gl1 to gln, so that a current can flow between the corresponding first electrode 12 and the grounded second electrode 14, thereby completing the display of the mth frame image. In the touch detection phase, the touch detection circuit 110 operates. The first electrode 12 is used for touch detection, and the second electrode 14 is connected to Vcom or a specific voltage to cooperate with touch detection. After the touch detection phase is finished, the touch display panel enters an m+1st frame display phase.

In a variation of this embodiment, the number of the first electrodes 12 may be 160, the number of the second electrodes 14 may be 80, the first electrodes 12 and the second electrodes 14 form a display area of 160×80, and when the touch detection is performed, the 5 first electrodes 12 are combined into one detection channel, so the 160 forms 32 detection channels for the first electrodes 12 and two detection channels for positioning the detection electrodes 101 and 102.

Referring to fig. 5, the touch detection area of the touch display panel may include 8 touch key areas including a first set of touch key areas A1, A2, A3, A4 adjacent to the first positioning detection electrode 101 and a second set of touch key areas B1, B2, B3, B4 adjacent to the second positioning detection electrode 102. Thus, the 8 touch key areas may be divided into two rows with a vertical coordinate A, B and four columns with horizontal coordinates 1, 2, 3, 4.

When a user touches a certain touch key region, the corresponding first electrode 12 can be detected by the touch detection circuit 110 to change the self capacitance and confirm the corresponding lateral coordinate of the touch key region, and the corresponding first positioning detection electrode 101 or second positioning detection electrode 102 can be detected by the touch detection circuit 110 to change the self capacitance and confirm the corresponding longitudinal coordinate of the touch key region, so that the touch detection circuit 110 can determine which touch key region the positioning user touch position is located. The actual area of the touch key area is not large, and an icon or button representing a touch in the user interface may be disposed adjacent to the position of the first or second positioning detection electrode 101 or 102 when configuring the User Interface (UI) of the touch display panel, so that the user may necessarily touch the first or second positioning detection electrode 101 or 102 when touching. As shown in fig. 4, a circular dotted box represents the actual touch position of the user's finger, and a rectangular dotted box represents the user interface that can be touch-controlled. In the display stage, the touch display panel displays a user interface adjacent to the first or second location detection area 101 or 102 at a position where the display area corresponding to the touch key area is adjacent to the location detection electrode. Accordingly, the user overlaps the first or second positioning detection electrode 101 or 102 at the actual touch position at the time of the touch operation, thereby causing a change in self capacitance of the first or second positioning detection electrode 101 or 102.

In the above embodiments, the first positioning detection electrode 101 and the second positioning detection electrode 102 are exemplary, and in other embodiments of the present invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 may be collectively referred to as positioning detection electrodes, and the number thereof is not particularly limited.

Referring to fig. 6, the touch detection circuit 110 includes an amplifying module 111, an analog-to-digital converter 112, and a processor 113. Since the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102 are grounded during touch detection, the corresponding grounded capacitance is referred to herein as a self-capacitance. The amplifying module 111 receives the charge change of the touch detection capacitor 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 according to the analog touch detection voltage signal, and the processor 113 performs signal processing to obtain a touch detection result.

The self-capacitance of the first electrode 12, the first positioning detection electrode 101, and the second positioning detection electrode 102 is defined as a touch detection capacitance C1. The amplifying module 111 includes a first switch S1, a second switch S2, a resistor R1, a third switch S3, an amplifying capacitor C2, and an amplifier 1111. The high level voltage VDD (for example, the device power 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 a parasitic capacitance of the first electrode 12 or the first positioning detection electrode 101, and the second positioning detection electrode 102 to the ground, i.e., a self-capacitance). One end of the touch detection capacitor C1 connected to the first switch S1 is further connected to the positive input end of the amplifier 1111 through the second switch S2 and the resistor R1, and the output end of the amplifier 1111 is connected to the positive input end of the amplifier 1111 through the amplifying capacitor C2. The negative input 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 output of the amplifier 1111 outputs an amplified touch detection voltage Vout having a magnitude vout= (VDD-Vcmop) C1/C2, where Vcmop represents the common mode voltage of the amplifier 1111. Specifically, the initial charge C1 of the touch detection capacitor C1 is VDD, the end charge C1 is Vcmop, and the amount of released charge of the touch detection capacitor C1 is C1 VDD-C1 Vcmop. The charge may be converted into a change in the output voltage of the amplifier 1111, i.e., c2×vout=c1×vdd—c1×vcmop. Vout= (VDD-Vcmop) C1/C2.

The touch detection voltage Vout output by the amplifier 1111 is proportional to the touch detection capacitance C1, and thus the magnitude of the touch detection capacitance C1 can be detected by detecting the magnitude of the touch detection voltage Vout. The ground may be a ground connection, a device ground, or other ground as defined herein.

The touch detection capacitor C1 is used for charging when the first switch S1 is turned on and the second switch S2 is turned off; the discharge occurs when the first switch S1 is turned off and the second switch S2 is turned on, and at this time, the charge on the touch detection capacitor C1 is partially transferred to the amplification capacitor C2. When the touch detection circuit 110 works, 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 are not turned on or off at the same time all the time. Therefore, a pulse signal with a certain period and frequency is generated during the continuous charging and discharging process of the touch detection capacitor C1, and the pulse signal is amplified by the amplifier 1111 and then output to the analog-to-digital converter 112, and further processed and then output a corresponding digital signal to the processor 113. The processor 113 can store the output signal of the analog-to-digital converter 112 as an array, and compare the array value with a pre-stored reference value, so that a point where the detected output signal has a large change is a touch position.

The third switch S3 may be used to reset the amplifier 1111, which is in a normally off state. In addition, in a modified embodiment of the present embodiment, the touch detection circuit 110 may further include a filtering unit or element for filtering noise; a control unit for generating a pulse control signal, etc.

In a variation of the above embodiment, the touch detection circuit 110 may further detect a touch by detecting a mutual capacitance between the first positioning detection electrode 101 and/or the second positioning detection electrode 102 and a designated or adjacent one of the first electrodes 12. Referring to fig. 7, in a modified embodiment of the present invention, the first positioning detecting electrode 101 and a first electrode 12 have an equivalent mutual coupling capacitance Cm (i.e. mutual capacitance), and the first positioning detecting electrode 101 and the first electrode 12 have an electric field distribution. When an external finger touches or approaches the first positioning detection electrode 101 and the first electrode 12, the finger absorbs a part of the electric field emitted by the first electrode 12 due to the coupling capacitance between the human body and the ground, the electric field received by the first positioning detection electrode 101 decreases, and a small current may flow through the human body to the ground via the first electrode 12, and accordingly, a small current may also flow through the human body to the ground via the first positioning detection electrode 101, resulting in a change in the mutual coupling capacitance Cm. Similar to the calculation of the change in the charge amount of the capacitor C1 in the above-described embodiment, the touch detection circuit 110 can determine whether the first positioning detection electrode 101 is touched by detecting the change in the charge amount of the mutual coupling Cm. Likewise, the second positioning detection electrode 102 can also detect touch positioning by detecting the mutual coupling capacitance between the second positioning detection electrode and one of the first electrodes 12.

Therefore, in the above embodiment and the modified embodiment of the present invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 may be used for touch detection in a self-capacitance manner, or may be used for touch detection in a mutual capacitance manner, or may be used for touch detection in a combination manner, which is not limited by the present invention, and those skilled in the art can understand that all or part of the modifications, combinations, substitutions, extensions, etc. of the above embodiment are all within the protection scope of the present invention.

Referring to fig. 8, a schematic diagram of a modified embodiment of the foregoing embodiment, the touch display panel is basically the same as the touch display panel in the foregoing embodiment in terms of structure and implementation principle, and the difference is that: the first positioning detection electrode 101, the second positioning detection electrode 102 and the second electrode layer are arranged on the same layer.

Referring to fig. 9, a schematic diagram of a modified embodiment of the foregoing embodiment, the touch display panel is basically the same as the touch display panel in the foregoing embodiment in terms of structure and implementation principle, and the difference is that: the first positioning detection electrode 101 and the second positioning detection electrode 102 are arranged in a single layer on the first electrode layer. 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 at this time.

Referring to fig. 10, a schematic diagram of a modified embodiment of the foregoing embodiment, the touch display panel is basically the same as the structure and implementation principle of the touch display panel in the foregoing embodiment, and the difference is that a plurality of other positioning detection electrodes are further included in a single layer disposed between the first electrode layer and the glass cover plate 11.

The present invention is not limited thereto, and in other embodiments of the present invention, the first positioning detecting electrode 101 and the second positioning detecting electrode 102 may have other arrangements, so long as the detection and positioning of the touch position in the extending direction of the first electrode 12 can be achieved, which falls within the protection scope of the present invention.

Referring to fig. 11, in another embodiment of the touch display panel of the present invention, the touch display panel includes a plurality of first electrodes 22 extending in a first direction, a plurality of second electrodes 24 extending in a second direction and overlapping the first electrodes, a light emitting layer (not shown) disposed between the first electrodes 22 and the second electrodes 24, first and second positioning detection electrodes 201 and 202 disposed at both sides of the first electrodes 22 and intersecting extension lines of the first electrodes 22, a data driving circuit 220 connected to the first electrodes 22, a scan 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 electrodes 201, and the second positioning detection electrodes 202. The first direction and the second direction intersect perpendicularly or non-perpendicularly. The touch detection circuit 210 is configured to detect a change in capacitance of the first electrode 22, the first positioning detection electrode 201, and the second positioning detection electrode 202 when the touch display panel is in a touch detection mode, so as to position a touch position of an external object (e.g., a finger). The data driving circuit 220 is configured to supply a current to the first electrode 22. The scan driving circuit 230 is connected to the second electrode 24, and is used for driving the second electrode 24 in a progressive scan manner, so that the second electrode 24 corresponding to the scan is grounded, and thus, current passes between the second electrode 24 corresponding to the scan and the first electrode 22, and other second electrodes 24 not being scanned are disconnected and grounded and are not conducted with the first electrode 22. The light emitting layer may include light emitting elements that emit colors of red, green, blue, etc., which emit light when current flows therethrough. By repeating the above progressive scanning and progressive display, after all the second electrodes 24 are scanned, the touch display panel completes one frame of image display, and the touch display panel enters the touch detection mode from the display driving mode. The touch detection circuit 210 detects a change in self capacitance of the first electrode 22 and the first and second positioning detection electrodes 201, 202, and positions a touch position of an external object (e.g., a finger) including confirming coordinates of the touch position in an extending direction of the first electrode 22 and coordinates perpendicular to the extending direction of the first electrode 22. After the first electrode 22, the first positioning detection electrode 201, and the second positioning detection electrode 202 complete the touch detection, the touch display panel ends the touch detection mode, enters the display driving mode, and continues the display of the next frame image. In fact, the first electrode 22 serves as a touch detection electrode at the time of touch detection and as a display driving electrode at the time of display driving.

The scan driving circuit 230 includes a scan signal generating circuit 231, a switching circuit 233, and a common voltage generating circuit 232. The scan signal generating circuit 231 is connected to the switching circuit 232. The common voltage generating circuit 232 is connected to the second electrode 24 through the switching circuit 232. The switching circuit 233 includes a plurality of switches (not numbered), which may be three-terminal switching elements (e.g., field effect transistors) including one control terminal and two conduction terminals. The scan signal generating circuit 231 is connected to the control terminals of the switches, and is configured to generate and output a scan signal to the switches, where the switches are turned on or off under the control of the scan signal. The common voltage generating circuit 232 is connected to one conductive terminal of the plurality of switches, and the other conductive terminal of the plurality of switches is connected to the second electrode 24. The common voltage generating circuit 232 is configured to generate a common voltage (Vcom) and supply the common voltage to the second electrode 24 connected correspondingly when the switch is turned on. The second electrode 24 is grounded when the correspondingly connected switch is turned off. The scan signal generating circuit 231 turns off the plurality of switches row by row, thereby grounding the second electrode 24 row by row. And, only one second electrode 24 is grounded at the same time. In this embodiment, the common voltage is a high level voltage, for example, 8 to 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, so that the light emitting layer disposed between the first electrode 22 and the second electrode 24, particularly, the light emitting layer corresponding to the overlapping portion of the plurality of first electrodes 22 and the second electrode 24, can generate electroluminescence. The magnitude of the current supplied from the data driving circuit 22 to the first electrode 22 may be different, so that the light emitting brightness of the light emitting layers corresponding to different overlapping positions of the first electrode 22 and the second electrode 24 may be different.

The first positioning detecting electrode 201 and the second positioning detecting electrode 202 may be disposed on the layer where the first electrode 22 is disposed, or on the layer where the second electrode 24 is disposed, or on a single layer on the first electrode 22. A protective layer (e.g., a glass cover plate) may be further disposed above the first electrode 22, and a user may perform touch control operation by touching the protective layer.

Referring to fig. 12, another embodiment of the touch display panel of the present invention includes a plurality of first electrodes 32 extending in a first direction, a plurality of second electrodes 34 extending in 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, first and second positioning detection electrodes 301 and 302 disposed at both sides of the second electrodes 34 and intersecting extension lines of the second electrodes 34, a data driving circuit 320 connected to the first electrodes 32, a scan 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 electrodes 301, and the second positioning detection electrodes 302. The first direction and the second direction intersect perpendicularly or non-perpendicularly. The touch detection circuit 310 is configured to detect a change in self capacitance of the second electrode 34, the first positioning detection electrode 301, and the second positioning detection electrode 302 when the touch display panel is in a touch detection mode, so as to position a touch position of an external object (e.g., a finger). The data driving circuit 320 is configured to supply a current to the first electrode 32. The scan driving circuit 330 is connected to the second electrode 34, and is used for driving the second electrode 34 in a progressive scan manner, so that the second electrode 34 corresponding to the scan is grounded, and thus, current passes between the second electrode 34 corresponding to the scan and the first electrode 32, and other second electrodes 34 not being scanned are disconnected and grounded and are not conducted with the first electrode 32. The light emitting layer may include light emitting elements that emit colors of red, green, blue, etc., which emit light when current flows therethrough. By repeating the above progressive scanning and progressive display, after all the second electrodes 34 are scanned, the touch display panel completes one frame of image display, and the touch display panel enters the touch detection mode from the display driving mode. The touch detection circuit 310 detects the change in self capacitance of the second electrode 34 and the first and second positioning detection electrodes 301 and 302, and positions the touch position of an external object (for example, a finger) including confirming the coordinates of the touch position in the extending direction of the second electrode 34 and the coordinates perpendicular to the extending direction of the second electrode 34. After the second electrode 34, the first positioning detection electrode 301 and the second positioning detection electrode 302 complete the touch detection, the touch display panel ends the touch detection mode, enters the display driving mode, and continues the display of the next frame of image. In fact, the second electrode 34 serves as a touch detection electrode at the time of touch detection and as a display driving electrode at the time of display driving.

The scan driving circuit 330 includes a scan signal generating circuit 331, a switching circuit 333, and a common voltage generating circuit 332. The scan signal generating circuit 331 is connected to the switching circuit 332. The common voltage generating circuit 332 is connected to the second electrode 34 through the switching circuit 332. The switching circuit 333 includes a plurality of switches (not numbered) which may be three-terminal switching elements (e.g., field effect transistors) including a control terminal and two conduction terminals. The scan signal generating circuit 331 is connected to the control terminals of the switches, and is configured to generate and output a scan signal to the switches, where the switches are turned on or off under the control of the scan signal. The common voltage generating circuit 332 is connected to one conductive terminal of the plurality of switches, and the other conductive terminal of the plurality of switches is connected to the second electrode 34. The common voltage generating circuit 332 is configured to generate a common voltage and provide the common voltage to the second electrode 34 that is connected correspondingly when the switch is turned on. The second electrode 34 is grounded when the correspondingly connected switch is turned off. The scan signal generating circuit 331 turns off the plurality of switches row by row, thereby grounding the second electrode 34 row by row. The scan signal generating circuit 331 connects only one of the second electrodes 34 to ground at the same 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, so that the light emitting layer disposed between the first electrode 32 and the second electrode 34, particularly, the light emitting layer corresponding to the overlapping portion of the plurality of first electrodes 32 and the second electrode 34, can generate electroluminescence. The magnitude of the current supplied from the data driving circuit 32 to the first electrode 32 may be different, so that the light emitting brightness of the light emitting layers corresponding to different overlapping positions of the first electrode 32 and the second electrode 34 may be different. The first positioning detecting electrode 301 and the second positioning detecting electrode 302 may be disposed on the layer where the first electrode 32 is disposed, or on the layer where the second electrode 34 is disposed, or on a single layer on the first electrode 32.

Referring to fig. 13, in another embodiment of the touch display panel of the present invention, the touch display panel includes a plurality of first electrodes 42 extending in a first direction, a plurality of second electrodes 44 extending in a second direction and overlapping the first electrodes, first and second positioning detection electrodes 401 and 402 disposed at both sides of the first electrodes 42 and intersecting extension lines of the first electrodes 42, a data driving circuit 420 connected to the first electrodes 42, a scan driving circuit 430 connected to the second electrodes 44, and a touch detection circuit 410 connected to the first electrodes 42, the first and second positioning detection electrodes 401 and 402. The first direction and the second direction intersect perpendicularly or non-perpendicularly. The touch detection circuit 410 is configured to detect a change in capacitance of the first electrode 42, the first positioning detection electrode 401, and the second positioning detection electrode 402 when the touch display panel is in a touch detection mode, so as to position a touch position of an external object (e.g., a finger). The data driving circuit 420 is configured to supply a current to the first electrode 22. The scan driving circuit 430 is connected to the second electrode 44, and is used for driving the second electrode 44 in a progressive scan manner, so that the second electrode 44 corresponding to the scan is grounded, and thus, current passes between the second electrode 44 corresponding to the scan and the first electrode 42, and other second electrodes 44 not being scanned are disconnected and grounded and are not conducted with the first electrode 42. By repeating the above progressive scanning and progressive display, after all the second electrodes 44 are scanned, the touch display panel completes scanning of one frame of image, and the touch display panel enters the touch detection mode from the display driving mode. The touch detection circuit 410 detects a change in self capacitance of the first electrode 42 and the first and second positioning detection electrodes 401, 402, and positions a touch position of an external object (e.g., a finger) including confirming coordinates of the touch position in an extending direction of the first electrode 42 and coordinates perpendicular to the extending direction of the first electrode 42. After the first electrode 22, the first positioning detection electrode 401 and the second positioning detection electrode 402 complete the touch detection, the touch display panel ends the touch detection mode, enters the display driving mode, and continues the display of the next frame image. In fact, the first electrode 42 serves as a touch detection electrode at the time of touch detection and as a display driving electrode at the time of display driving.

The first positioning detecting electrode 401 and the second positioning detecting electrode 402 may be disposed on the layer where the first electrode 42 is disposed, or on the layer where the second electrode 44 is disposed, or on a single layer on the first electrode 42. A protective layer (e.g., a glass cover plate) may be further disposed above the first electrode 42, and a user may perform a touch control operation by touching the protective layer. The layer positions where the first positioning detection electrode 401 and the second positioning detection electrode 402 are provided are not particularly limited in the present invention.

The touch detection circuit 410 includes an amplifying 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 that can be used for signal input and output. The plurality of first electrodes 42, the first positioning detecting electrode 401 and the second positioning detecting electrode 402 are connected to a first input/output terminal of the multiplexer 414, the charging module 416 is connected to one conductive terminal of the first switch K1, the other conductive terminal of the first switch K1 is connected to a second input/output terminal of the multiplexer 414, and the second input/output terminal of the multiplexer 414 is further connected to the amplifying module 411 through two conductive terminals of the second switch K2. The amplifying 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 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 one control terminal and two conduction terminals, which can be turned on or off by applying a high level or a low level to the control terminal.

In this embodiment, the control unit 415 can provide a square wave pulse or a sine wave pulse signal 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 may be an NMOS transistor and a PMOS transistor, and are reasonably set by a control signal output by the control unit 415, so that the first switch K1 and the second switch K2 are not turned on or off at the same time all the time. The first electrode 42, the first positioning detection electrode 401 and the second positioning detection electrode 402 are divided into a plurality of detection channels (or called channels) by the multiplexer 414, each detection channel comprises a plurality of first electrodes 42 and/or first positioning detection electrodes 401 and second positioning detection electrodes 402, and each detection channel corresponds to a different amplifying module 411. The operation of the touch detection circuit will be described below by taking a detection channel as an example.

When the touch display panel is in the touch detection mode, the control unit 415 transmits a pulse control signal to the first switch K1 and the second switch K2. When the first switch K1 is turned on and the second switch K2 is turned off, the charging module 416 charges the touch detection capacitances of the first electrode 42, the first positioning detection electrode 401, and the second positioning detection electrode 402 through the multiplexer 414, and specifically, the charging module 416 charges the parasitic capacitance (i.e., self capacitance) formed by connecting the first electrode 42 or the first positioning detection electrode 401, and the second positioning detection electrode 402 for touch detection and connecting them to the ground. When the first switch K1 is turned off and the second switch K2 is turned on, the touch detection capacitance is discharged through the multiplexer 414, and a portion of the charge on the touch detection capacitance is transferred to the capacitance within the amplifying module 411. As the first switch K1 and the second switch K2 are continuously turned on and off, the amplifying module 411 performs signal amplification processing on the pulse signal formed by charging and discharging the touch detection capacitor, and generates a corresponding amplified capacitor output signal, and the analog-to-digital converter converts the voltage signal output by the amplifying module into a digital signal and outputs the digital signal to the processor 413. The processor 413 performs a positioning process of touch detection according to the digital signal output from the analog-to-digital converter 412. The charging module 416 may be a power module or other voltage output circuit, and the output voltage of the charging module 416 may be 5V, or 3V, 8V, 10V, 15V, etc., which is not particularly limited in the present invention.

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

The invention also provides a touch detection circuit which is used for detecting self-capacitance of a plurality of first electrodes with certain extending directions and positioning detection electrodes which are arranged on two sides of the first electrodes and are intersected with extension lines of the first electrodes, the touch detection circuit judges the coordinates of a touch position in the direction intersected with the extending directions of the first electrodes by detecting the self-capacitance of the first electrodes, and judges the coordinates of the touch position in the extending directions of the first electrodes by detecting the self-capacitance of the positioning detection electrodes. The touch detection circuit comprises an amplifying module, an analog-to-digital converter and a processor, wherein the amplifying module receives the charge changes of the self-capacitance of the first electrode and the positioning detection electrode and outputs corresponding amplified touch detection voltage to the analog-to-digital converter, the analog-to-digital converter outputs a digital signal to the processor according to an analog touch detection voltage signal, and the processor obtains a touch detection result after signal processing.

The self-capacitance of the first electrode and the positioning detection electrode is a touch detection capacitance, the amplifying module comprises a first switch, a second switch, a resistor, a third switch, an amplifying capacitor and an amplifier, one high-level voltage is connected with one end of the touch detection capacitor through the first switch, the other end of the touch detection capacitor is grounded, one end of the touch detection capacitor connected with the first switch is also connected to the positive electrode input end of the amplifier through the second switch and the resistor, the output end of the amplifier is connected to the positive electrode input end of the amplifier through the amplifying capacitor, the negative electrode input end of the amplifier is grounded, and the third switch is connected with the two ends of the amplifying capacitor and between the output end and the positive electrode input end of the amplifier.

The touch detection circuit includes an amplifying module, an analog-to-digital converter, a processor, a multiplexer including a first input/output terminal and a second input/output terminal that can be used for signal input and output, a control unit, a charging module, a first switch, and a second switch. The first electrodes and the two positioning detection electrodes are connected with a first input/output end of the multiplexer, the charging module is connected with one conducting end of the first switch, the other conducting end of the first switch is connected with a second input/output end of the multiplexer, the second input/output end of the multiplexer is further connected with the amplifying module through two conducting ends of the second switch, the amplifying module is connected with the analog-to-digital converter, the analog-to-digital converter is connected with the processor, and the control unit is respectively connected with the control ends of the first switch and the second switch.

The control unit can provide square wave pulse or sine wave pulse signals for controlling the first switch and the second switch to be turned on or off, the first switch and the second switch cannot be turned on or off at the same time, the first electrode and the two positioning detection electrodes are divided into a plurality of detection channels through the multiplexer, each detection channel comprises a plurality of first electrodes and/or first positioning detection electrodes and second positioning detection electrodes, and each detection channel corresponds to a different amplifying module.

The invention also provides a display device which comprises the touch detection circuit and/or the touch display panel, wherein the touch detection circuit is used for detecting the touch position of the touch display panel in a two-dimensional direction.

The invention also provides an electronic device, which may include the touch display panel, the touch detection circuit or the display device of any one or combination of the above embodiments, and the electronic device may be a device or a device for realizing man-machine interaction by touch, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, an electronic watch, an augmented reality/virtual reality device, a human motion detection device, an autopilot, an intelligent home device, a security device, an intelligent robot, and the like.

Compared with the prior art, the touch display panel comprises the positioning detection electrodes arranged on two sides of the first electrode, the first electrode can be used for detecting touch actions with the positioning detection electrodes comprising the first positioning electrode and the second positioning electrode, the first electrode can position a touch position in a direction intersecting with the extending direction of the first electrode, and the positioning detection electrode can position the touch position in the extending direction of the first electrode, so that two-dimensional touch positioning is realized, and the technical problem that the PMOLED touch display panel in the prior art only has single-direction touch detection is solved. In addition, the touch display panel of the invention enables the touch position and the first electrode and the first positioning detection electrode or the first electrode and the second positioning detection electrode to overlap when a user performs a touch action by configuring the user interface with the first positioning detection electrode and the second positioning detection electrode, so that the two-dimensional coordinate direction of the touch position can be determined by detecting the self capacitance of the first electrode and the first and second positioning detection electrodes or the mutual capacitance between the first and second positioning detection electrodes and the first electrode. The touch detection circuit of the present invention can be used for the above touch display panel, and the display device and the electronic apparatus include the above touch detection circuit or touch display panel. Therefore, the touch display panel, the touch detection circuit, the display device and the electronic equipment have better user experience.

The references to "length", "width", "upper", "lower", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "interior", "exterior", etc., as may be made in this specification are based on the references to orientations or positional relationships shown in the drawings, merely to facilitate the description of the embodiments of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the invention. Like reference numerals and letters designate like items in the drawings, and thus once an item is defined in one drawing, no further definition or explanation thereof is necessary in the subsequent drawings. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance. In the description of the present invention, the meaning of "plurality" means at least two, and the meaning of "plurality" means at least two, unless specifically defined otherwise. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, or may be internal communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The touch detection circuit is used for detecting a PMOLED panel, the PMOLED panel comprises a first electrode layer and at least two positioning detection electrodes, the first electrode layer comprises a plurality of first electrodes with first extending directions, the positioning detection electrodes are arranged on two opposite sides outside the edges of the first electrode layer and extend along second extending directions different from the first extending directions and intersect with the first electrode extension lines, the touch detection circuit judges the coordinates of a touch position in the second extending directions by detecting the self capacitance of the first electrodes, and the touch detection circuit judges the coordinates of the touch position in the first extending directions by detecting the self capacitance of the positioning detection electrodes or detecting the mutual capacitance of the positioning detection electrodes and the first electrodes.

2. The touch detection circuit of claim 1, wherein the touch detection circuit comprises an amplifying module, an analog-to-digital converter and a processor, the amplifying module receiving the charge changes of the self-capacitances of the first electrode and the location detection electrode and outputting a corresponding amplified touch detection voltage to the analog-to-digital converter, the analog-to-digital converter outputting a digital signal to the processor based on the analog touch detection voltage signal, the processor performing signal processing to obtain a touch detection result.

3. The touch detection circuit according to claim 2, wherein the self-capacitance of the first electrode and the positioning detection electrode is a touch detection capacitance, the amplifying module comprises a first switch, a second switch, a resistor, a third switch, an amplifying capacitor and an amplifier, one high-level voltage is connected to one end of the touch detection capacitor through the first switch, the other end of the touch detection capacitor is grounded, one end of the touch detection capacitor connected to the first switch is also connected to an anode input end of the amplifier through the second switch and the resistor, an output end of the amplifier is connected to the anode input end of the amplifier through the amplifying capacitor, the anode input end of the amplifier is grounded, and the third switch is connected to both ends of the amplifying capacitor and is connected between the output end and the anode input end of the amplifier.

4. The touch detection circuit of claim 1, comprising an amplification module, an analog-to-digital converter, a processor, a multiplexer, a control unit, a charging module, a first switch and a second switch, the multiplexer comprising a first input/output terminal and a second input/output terminal capable of being used for signal input and output, the plurality of first electrodes and the two location detection electrodes being connected to the first input/output terminal of the multiplexer, the charging module being connected to one conducting terminal of the first switch, the other conducting terminal of the first switch being connected to the second input/output terminal of the multiplexer, the second input/output terminal of the multiplexer being further connected to the amplification module through the two conducting terminals of the second switch, the amplification module being connected to the analog-to-digital converter, the analog-to-digital converter being connected to the processor, the control unit being connected to the control terminals of the first switch and the second switch, respectively.

5. The touch detection circuit according to claim 4, wherein the control unit is capable of providing square wave pulse or sine wave pulse signals for controlling the first switch and the second switch to be turned on or off without the first switch and the second switch being turned on or off simultaneously, the first electrode and the two positioning detection electrodes being divided into a plurality of detection channels by the multiplexer, each detection channel comprising a plurality of first electrodes and/or first positioning detection electrodes and second positioning detection electrodes, each detection channel corresponding to a different amplification module.

6. The touch detection circuit according to claim 1, wherein the touch detection circuit detects coordinates of the touch position in a direction intersecting the extending direction thereof by detecting self-capacitance of the first electrode, and the touch detection circuit detects coordinates of the touch position in the extending direction of the first electrode by detecting self-capacitance of the two positioning detection electrodes or mutual capacitance of the two positioning detection electrodes and the first electrode.

7. The touch detection circuit of claim 6, wherein the touch detection circuit is for a touch display panel capable of time-sharing display driving and touch detection, and wherein the touch detection circuit is configured to detect a two-dimensional touch position on the touch display panel during a touch detection phase.

8. A touch display panel comprising the touch detection circuit according to any one of claims 1 to 7, wherein the touch display panel comprises a plurality of first electrodes extending in a first direction, a plurality of second electrodes extending in a second direction and overlapping the first electrodes, positioning detection electrodes provided on both sides of the first electrodes and intersecting with extension lines of the first electrodes, the first electrodes and the second electrodes being capable of being used for display driving, and the first electrodes and the two positioning detection electrodes being capable of being used for touch detection.

9. The touch display panel according to claim 8, wherein the first electrode constitutes a first electrode layer, the second electrode constitutes a second electrode layer, the number of the positioning detection electrodes is two, the positioning detection electrodes are provided on the same layer as the first electrode, or the two positioning detection electrodes are provided on the same layer as the second electrode, or the two positioning detection electrodes are provided on a single layer on the first electrode, the first electrode is for detecting coordinates of a touch position in a direction intersecting with an extending direction thereof, the two positioning detection electrodes are for detecting coordinates of both ends of the touch position in the extending direction of the first electrode, and the touch display panel is a PMOLED touch display panel.

10. A display device comprising the touch detection circuit according to any one of claims 1 to 7 and/or the touch display panel according to any one of claims 8 to 9.

11. An electronic device comprising the display device of claim 10, wherein the electronic device is one of a cell phone, a tablet computer, a notebook computer, an electronic book, an electronic watch, an augmented reality/virtual reality device, a human motion detection device, an autopilot, an intelligent home device, a security device, and an intelligent robot.