CN110032302B - Touch detection method - Google Patents

Touch detection method Download PDF

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Publication number
CN110032302B
CN110032302B CN201910218135.8A CN201910218135A CN110032302B CN 110032302 B CN110032302 B CN 110032302B CN 201910218135 A CN201910218135 A CN 201910218135A CN 110032302 B CN110032302 B CN 110032302B
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electrode
touch
electrodes
detection
touch detection
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CN110032302A (en
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王洁
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Shenzhen Xihua Technology Co Ltd
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Shenzhen Xihua Technology Co Ltd
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Priority to CN202211172157.3A priority patent/CN115576453A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

The invention discloses a touch detection method, which comprises the steps of providing a plurality of first electrodes with a first extension direction and two positioning detection electrodes which are arranged at two sides of the first electrodes and are intersected with extension lines of the first electrodes; judging the coordinate of the touch position in the direction intersecting the extending direction of the first electrode by detecting the self-capacitance of the first electrode; and judging the coordinate of the touch position in the extending direction of the first electrode by detecting the self capacitance of the positioning detection electrode or detecting the mutual capacitance between the positioning detection electrode and the first electrode. The invention also discloses a touch detection circuit, a touch display panel and electronic equipment which adopt the touch detection method. The invention has better user experience.

Description

Touch detection method
Technical Field
The invention relates to the technical field of electronics, in particular to a touch detection method, a touch detection circuit, a touch display panel and electronic equipment with good user experience.
Background
With the development of technology and the improvement of living standard of people, the use of display devices including mobile phones, tablet computers, wearable digital products and the like is increasing.
An Organic Light-Emitting Diode (OLED) display technology is a technology for realizing display by using reversible color change generated by an Organic semiconductor material under the driving of current. The OLED has advantages of light weight, thinness, low power consumption, high contrast ratio, and capability of realizing flexible display, and thus the OLED display technology is considered as a new generation display technology having the greatest development prospect. The OLED display technology may be classified into a Passive Matrix Organic Light Emitting Diode (PMOLED) and an Active Matrix Organic Light Emitting Diode (AMOLED) display technology according to a driving manner. At present, PMOLED display panels are widely used in small-sized electronic devices, such as watches, players, and the like.
Touch detection and control can be realized by adding a touch detection electrode and a detection chip to an OLED display panel, and a display panel with touch detection and display driving is also generally referred to as a touch display panel. However, due to the arrangement of the electrodes of the PMOLED display panel and other reasons, the PMOLED electrodes are used for touch positioning during touch detection, and detection can be performed only in one dimension, but two-dimensional positioning cannot be achieved, so that the user experience is poor.
Disclosure of Invention
The invention aims to provide a touch detection method with better user experience, a touch detection circuit adopting the touch detection method, a touch display panel and electronic equipment.
One aspect of the invention discloses a touch detection method, which comprises the steps of providing a plurality of first electrodes with a first extending direction and two positioning detection electrodes which are arranged at two sides of the first electrodes and intersect with the extension lines of the first electrodes; judging the coordinate of the touch position in the direction intersecting the extending direction of the first electrode by detecting the self-capacitance of the first electrode; and judging the coordinate of the touch position in the extending direction of the first electrode by detecting the self capacitance of the positioning detection electrode or detecting the mutual capacitance between the positioning detection electrode and the first electrode.
Optionally, the touch panel further includes a plurality of second electrodes having a second extending direction and overlapping with the first electrodes, and a light emitting layer disposed between the first electrodes and the second electrodes, where the first electrodes and the second electrodes together form a display area, and the first electrodes and the positioning detection electrodes together form a touch detection area.
Optionally, the method further includes dividing the touch detection area into a plurality of touch key areas, and displaying a user interface next to the positioning detection electrode in the plurality of key areas.
Optionally, the first electrode constitutes a first electrode layer, the second electrode constitutes a second electrode layer, and the positioning detection electrode and the first electrode are disposed on the same layer, or the positioning detection electrode and the second electrode are disposed on the same layer, or the positioning detection electrode is disposed on a single layer on the first electrode.
Optionally, the method further includes providing a touch detection circuit, where the touch detection circuit is configured to detect a self capacitance of the first electrode, and detect a self capacitance of the positioning detection electrode or a mutual capacitance between the positioning detection electrode and the first electrode.
Optionally, the first electrode layer and the second electrode layer are of an ITO layer or an ITO/Ag/ITO composite layer structure, or the first electrode layer and the second electrode layer are made of an opaque conductive material.
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, 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.
One aspect of the invention also discloses a touch detection circuit, which adopts the touch detection method.
One aspect of the invention also discloses a touch display panel, which adopts the touch detection method or comprises the touch detection circuit.
One aspect of the present invention further discloses an electronic device, wherein the electronic device adopts the touch detection method or includes the touch display panel, and the electronic device is one of a mobile phone, a tablet computer, a notebook computer, an electronic book, an electronic watch, an augmented reality/virtual reality device, a human body motion detection device, an auto-driving automobile, an intelligent home device, a security device, and an intelligent robot.
Compared with the prior art, the touch detection method, the touch detection circuit, the touch display panel and the electronic device provided by the invention are provided with the positioning detection electrodes arranged on two sides of the first electrode, the first electrode and the positioning detection electrodes including the first positioning electrode and the second positioning electrode can be used for detecting touch actions, the first electrode can position a touch position in a direction intersecting with the extending direction of the first electrode, and the positioning detection electrodes 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 invention configures the user interface with the first positioning detection electrode and the second positioning detection electrode which are adjacent to each other, so that the touch position of the user is overlapped with the first electrode and the first positioning detection electrode or the first electrode and the second positioning detection electrode when the user performs a touch action, and the two-dimensional coordinate direction of the touch position can be determined by detecting the self-capacitance of the first electrode and the self-capacitance of the first positioning detection electrode and the self-capacitance of the second positioning detection electrode. Therefore, the invention has 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 of FIG. 1;
FIG. 3 is a block schematic diagram of the circuitry 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 present invention;
FIG. 6 is a schematic diagram of a touch detection circuit of one embodiment of the present invention;
FIG. 7 is a circuit schematic of one embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of one embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of one embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of one embodiment of the present invention;
FIG. 11 is a block schematic diagram of the circuitry of one embodiment of the present invention;
FIG. 12 is a block schematic diagram of the circuitry of one embodiment of the present invention;
FIG. 13 is a block schematic diagram of the circuitry of one embodiment of the present invention;
FIG. 14 is a flowchart illustrating a touch detection method according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The features and 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 application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.
At present, capacitive touch technologies are classified into surface Capacitance and projected Capacitance, and projected Capacitance is further classified into Self-Capacitance (Self-Capacitance) and mutual Capacitance (mutual Capacitance) implementations according to a detection method. The surface of the glass substrate is made into an electrode array which is arranged in a transverse and longitudinal staggered mode by using a transparent conductive material, and the transverse electrodes and the longitudinal electrodes respectively form capacitors with the ground. This capacitance is known as self-capacitance, i.e., the capacitance of the electrode to ground. The display panel having a touch detection function is also called a touch display panel, or a touch screen.
For the self-capacitance touch display panel, when a human body does not touch the touch detection area of the panel, the capacitance born by each capacitance electrode is a fixed value, when the human body touches the screen, the capacitance born by the corresponding self-capacitance electrode is the fixed value superposed with the human body capacitance, and the touch position can be judged by detecting the capacitance value change of each capacitance electrode. The basic principle is a charge and discharge circuit that is constantly charged and discharged. If a finger or other objects touch the panel area, the self-capacitance of the corresponding electrode in the touch area is changed, so that the 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 charge and discharge charge or the change of the 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 includes a plurality of first electrodes extending in a first direction, and the second electrode layer includes a plurality of second electrodes extending in a second direction. A glass cover plate or a glass substrate for protection may also be disposed on the first electrode layer.
In this embodiment, the first electrode and the second electrode are strip 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) that emits light when a current flows through the light emitting layer. Each overlap of the first and second electrodes may be considered a pixel, and a current may be applied to the first and second electrodes to address and activate the pixel by flowing a current through the first and second electrodes. The touch display panel can excite the light-emitting layer at different positions, so that pixel points of the light-emitting layer at different positions emit light or do not emit light.
In this embodiment, the first electrode layer and the second electrode layer may be made of a material having good electrical conductivity and light transmittance, for example, a transparent conductive oxide such as 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 modified embodiments of the present invention, the first electrode layer and the second electrode layer may also be made of opaque conductive materials, and the present invention is not limited thereto.
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 display panel having a touch control function. Of course, the present invention is not limited thereto, and in other embodiments of the present invention, the touch display panel may be any LED-based display panel implemented by any organic or inorganic electroluminescent material.
The Touch Display panel is connected to a Display driving chip and a Touch detection chip, and the Display driving chip and the Touch detection chip may be two independent chips or integrated in one chip, for example, integrated into one chip by 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 comprises a scanning driving circuit and a data driving circuit, wherein the scanning driving circuit is used for scanning the plurality of second electrodes line by line, and the data driving circuit is used for simultaneously providing currents required by light emission for the plurality of first electrodes. During one frame of image display time, only one of the second electrodes is short-circuited to the ground at the same time, and the other second electrodes are disconnected from the ground and supplied 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 electrodes and the grounded second electrodes, and the light emitting layers can emit light at the positions corresponding to the grounded first electrodes. And repeating the process for the second electrodes one row after another until all the second electrodes are scanned, thereby completing the display of one frame of picture. For example, but not limiting of, the touch display panel has a refresh rate of 100Hz, then the scanning of the second electrode should be completed within 10ms per frame of picture. 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 modified embodiments of the present invention, the first electrode COM electrode and the second electrode are SEG electrodes. The ground terminal may be an earth ground terminal, a device ground terminal, or other ground terminals defined as required, which should be broadly understood in the present invention and is not particularly limited thereto.
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 as to detect a position on the touch display panel touched by an external object (e.g., a finger), thereby implementing touch detection. When touch detection is carried out, if a finger of a user touches the glass cover plate adjacent to the first electrode, because a human body is electrified, a parasitic capacitance is formed between the finger and the first electrode, and the self-capacitance of the first electrode corresponding to the touch range of the finger is increased. The self-capacitance change causes charge and discharge charge change of the touch detection circuit, and the processor can calculate the self-capacitance according to the charge and discharge charge quantity or calculate the self-capacitance according to the pulse voltage value. The touch detection circuit can determine the first electrode with changed self-capacitance by detecting the voltage change value of the pulse signal or the charge and discharge charge change value on the first electrode, thereby determining the touch position. That is, the position or coordinates of the touch position of the finger in the direction intersecting the extending direction of the first electrode can be confirmed by the first electrode.
Of course, in the modified embodiment of the present invention, the second electrode may be multiplexed as a touch detection electrode.
In order to confirm the position of the finger touch position in the extending direction of the first electrode during touch detection, the touch display panel may further include a plurality of positioning detection electrodes, which are strip-shaped electrodes having extending directions different from 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, then 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 a 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 the positioning detection electrode can be connected with the scanning driving circuit or not connected with the scanning driving circuit. The positioning detection electrode 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 disposed on different layers.
The plurality of first electrodes and the plurality of second electrodes are overlapped to form a grid distribution, the overlapped part of the first electrodes and the second electrodes can be regarded as a pixel point, and the plurality of pixel points form a display area of the touch display panel, so that the first electrodes and the second electrodes jointly form the display area of the touch display panel. Meanwhile, the first electrodes are also multiplexed as touch detection electrodes during touch detection, so that the plurality of first electrodes and the positioning detection electrodes jointly form a touch detection area of the touch display panel.
In this embodiment, the plurality of positioning detection electrodes include a first positioning detection electrode and a second positioning detection electrode that are perpendicular to the first electrode and are disposed on both sides of the first electrode layer. The first positioning detection electrode and the second positioning detection electrode intersect with the first electrode or the extension line of the first electrode.
In this embodiment, the touch detection and the display driving are performed in a time-sharing manner, that is,: at one moment, the touch display panel is in either a display phase or a touch detection phase, and display driving and touch detection are not performed simultaneously. For example, the touch detection circuit detects a change in self-capacitance of the first electrode after the image display for each frame is completed. Therefore, the first electrode and the second electrode can be used for display driving, the first electrode and two positioning detection electrodes can be used for touch detection, the first electrode can be used for detecting the coordinates of the touch position in the direction intersecting the extending direction thereof, and the two positioning detection electrodes can be used for detecting the coordinates of the touch position in the extending direction of the first electrode.
It should be noted that other words for describing the first electrode, etc. for touch detection may appear in the present specification, such as but not limited to: a touch detection electrode, or a self-capacitance detection electrode, or a detection electrode, etc., which those skilled in the art can understand 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 terms "first", "second", "row", "column", and the like, which are presented in the description of the present invention, are only for convenience of description and do not represent any specific limitation.
The touch display panel is a PMOLED display panel, and when light beams are emitted from one side of an OLED substrate, the PMOLED display panel is a bottom-emitting display panel; when the light beams are emitted from the side far away from the substrate, the PMOLED display panel is a top-emitting display panel; when light beams are emitted from one side of the OLED substrate and one side far away from the substrate at the same time, the PMOLED display panel is a double-sided light-emitting display panel.
In addition, although the touch display panel is schematically described in the embodiments of the present application, the touch display panel of the present invention may also be used in other embodiments that do not require image display, such as a touch panel (TouchPad) for a notebook computer, in which case 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 an embodiment of the present invention, a touch display panel includes a first electrode layer (not numbered) including a plurality of first electrodes 12 extending in a first direction, a second electrode layer (not numbered) opposite to the first electrode layer and including a plurality of second electrodes 14 extending in 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 first and second alignment detection electrodes 101 and 102 disposed on both sides of the first electrode 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 alternately disposed to overlap. 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 11, a user can see an image display and perform touch control on the upper surface of the glass cover 11. The extension lines of the first electrodes 12 include an extension line in a first direction and an extension line in a direction opposite to the first direction.
Referring to fig. 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 be disposed on the same layer as the second electrode 14, or a layer may be disposed on the first electrode layer, which is not limited in the present invention. The light-emitting layer 13 includes an electroluminescent layer made of organic molecule thin films, such as but not limited to: and (5) stacking the OLED. The first electrode 12 is an anode and the second electrode 14 is a cathode, and the first electrode 12 and the second electrode 14 can be used for supplying 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 providing current to the first electrode 12. The scan driving circuit 130 is connected to the second electrodes 14, and is configured to drive the second electrodes 14 by line scanning, so that the correspondingly scanned second electrodes 14 are grounded, and thus a current passes between the correspondingly scanned second electrodes 14 and the first electrode 12, and the other second electrodes 14 that are not scanned are disconnected from being grounded and are not conducted with the first electrode 12. One frame image display is completed by repeating such progressive scanning and progressive display. During each frame of image display interval, 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 provides a high-level common voltage to the second electrode 14, the touch detection circuit 110 enables self-capacitances 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 a charge-discharge signal or a coupling voltage signal charge amount, and further processes the charge amount signal or the coupling voltage signal to further realize touch action and touch position detection of an external object (such as a finger) on the touch display panel.
The plurality of first electrodes 12 and the plurality of second electrodes 14 are overlapped to form a grid distribution, the overlapped part of the first electrodes 12 and the second electrodes 14 can be regarded as a pixel point, and the plurality of pixel points form a display area of the touch display panel, so that the first electrodes 12 and the second electrodes 14 jointly form the display area of the touch display panel. Meanwhile, the first electrodes 12 are also multiplexed as touch detection electrodes during touch detection, so that the plurality of first electrodes 12, the first positioning detection electrodes 101, and the second positioning detection electrodes 102 together form a touch detection area of the touch display panel. Obviously, the finger of the user may 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 during touch detection, and 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, so that the resolution of the touch area for touch detection does not need to be as high as that of the display area. Therefore, the first electrode 12 can be divided into a plurality of detection channels during touch detection, and each detection channel comprises a certain number of first electrodes 12. The signals of each detection channel are 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 some of the plurality of electrodes may be connected to one amplifier through a switch, or charge amount signals of charge and discharge of the plurality of electrodes may be summed by an adder and then input to one amplifier.
Referring to fig. 4, it is assumed that the number of the second electrodes 14 of the touch display panel is n. Gl1 to gln (n is a positive integer) in fig. 4 respectively represent scanning signals applied to the n second electrodes 14. In the display phase, the touch display panel is in the 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 is operated, 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. And after the touch detection stage is finished, the touch display panel enters an m +1 th frame display stage.
In a modified embodiment of this embodiment, the number of the first electrodes 12 may be 160, the number of the second electrodes 14 may be 80, and the first electrodes 12 and the second electrodes 14 form a 160 × 80 display region, and when performing touch detection, 5 first electrodes 12 are combined into one detection channel, so that the 160 forms 32 detection channels and two detection channels for positioning the detection electrodes 101 and 102 for the first electrodes 12. 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 can be divided into two rows with a vertical coordinate of A, B and four columns with horizontal coordinates of 1, 2, 3, and 4.
When a user touches a certain touch key area, the corresponding first electrode 12 can be detected by the touch detection circuit 110 to change the self-capacitance and can confirm the lateral coordinate corresponding to the touch key area, and meanwhile, 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 can confirm the longitudinal coordinate corresponding to the touch key area, so that the touch detection circuit 110 can determine which touch key area the touch position of the user is located at. The actual area of the touch key region is not large, and when configuring a User Interface (UI) of the touch display panel, an icon or a button representing touch in the user interface may be disposed in close proximity to the position of the first positioning detection electrode 101 or the second positioning detection electrode 102, so that a user may inevitably touch the first positioning detection electrode 101 or the second positioning detection electrode 102 unconsciously during a touch operation. As shown in fig. 4, a circular dashed box represents the actual touch position of the user's finger, and a rectangular dashed box represents a user interface that can be touch-controlled. In the display stage, the touch display panel displays a user interface adjacent to the first positioning detection area 101 or the second positioning detection area 102 at a position adjacent to the positioning detection electrode in a display area corresponding to the touch key area. Therefore, the actual touch position of the user during the touch operation 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.
In the above embodiments, the first positioning detection electrode 101 and the second positioning detection electrode 102 are exemplified, 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.
In a modified embodiment of the above-described embodiment, the touch detection area can be divided into a plurality of touch key areas, and the touch display panel has a user interface adjacent to the positioning detection electrode in a display area corresponding to the touch key area.
Referring to fig. 6, the touch detection circuit 110 includes an amplifying 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, and the corresponding grounded capacitance is a self capacitance, which is herein referred to as a touch detection 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 an 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 and the first and second positioning detection electrodes 101 and 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. A high level voltage VDD (e.g., a 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 and second positioning detection electrodes 101 and 102 to ground, i.e., a self-capacitance). The touch detection capacitor C1 is connected to one end of the first switch S1 and is also 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 amplification capacitor C2. The negative input of the amplifier 1111 is connected to ground. The third switch S3 is coupled across the amplifying capacitor C2 between the output and positive input of the amplifier 1111. The output end of the amplifier 1111 outputs an amplified touch detection voltage Vout, which is (VDD-Vcmop) × C1/C2, where Vcmop represents a common mode voltage of the amplifier 1111, and the common mode voltage of the amplifier 1111 can be adjusted according to the circuit design requirement. Specifically, the touch detection capacitor C1 discharges an amount of charge C1 VDD-C1 Vcmop, with an initial charge C1 VDD and an end charge C1 Vcmop of the touch detection capacitor C1. The charge can be converted into a change in the output voltage of the amplifier 1111, i.e., C2 Vout — C1 VDD-C1 Vcmop. Therefore Vout is (VDD-Vcmop) C1/C2.
The touch detection voltage Vout output by the amplifier 1111 is proportional to the touch detection capacitor C1, and thus the size of the touch detection capacitor C1 can be detected by detecting the size of the touch detection voltage Vout. The ground may be a ground terminal, a device ground terminal, or other ground terminals defined as required.
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; when the first switch S1 is turned off and the second switch S2 is turned on, the electric charge on the touch detection capacitor C1 is partially transferred to the amplifying capacitor C2. When the touch detection circuit 110 is in operation, 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. Therefore, pulse signals with a certain period and frequency are generated during the continuous charging and discharging process of the touch detection capacitor C1, and the pulse signals are amplified by the amplifier 1111 and then output to the analog-to-digital converter 112, and after further processing, corresponding digital signals are output to the processor 113. The processor 113 can store the output signal of the analog-to-digital converter 112 in an array, and compare the array value with a pre-stored reference value, so that the point where the detected output signal has a large change is the touch position.
The third switch S3 can be used to reset the amplifier 1111, which is a normally off state. In addition, in a modified embodiment of this embodiment, the touch detection circuit 110 may further include a filtering unit or an element for filtering noise; a control unit for generating a pulsed control signal, etc.
In a modified embodiment of the above embodiment, the touch detection circuit 110 can also implement touch detection by detecting 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. Referring to fig. 7, in an alternative embodiment of the present invention, an equivalent mutual coupling capacitance Cm (i.e. mutual capacitance) is provided between the first positioning sensing electrode 101 and a first electrode 12, and an electric field distribution is provided between the first positioning sensing 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, the finger absorbs a part of the electric field emitted from the first electrode 12 due to a coupling capacitance between the human body and the ground, the electric field received by the first positioning detection electrode 101 is reduced, a small current may flow through the human body to the ground through the first electrode 12, and accordingly, a small current may also flow through the human body to the ground through the first positioning detection electrode 101, resulting in a change in the mutual coupling capacitance Cm. Similarly to the calculation of the change in the charge amount of the capacitor C1 in the above 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. Similarly, the second position detection electrode 102 can also detect the touch position by detecting the mutual coupling capacitance between the second position detection electrode and one of the first electrodes 12.
Therefore, in the above embodiments and the modified embodiments of the present invention, the first positioning detection electrode 101 and the second positioning detection electrode 102 may perform touch detection by using a self-capacitance method, may also perform touch detection by using a mutual capacitance method, or may perform touch detection by using a combination of the two methods.
Referring to fig. 8, it is a schematic diagram of a modified embodiment of the foregoing embodiment, and the structure and implementation principle of the touch display panel are basically the same as those of the touch display panel in the foregoing embodiment, except that: the first positioning detection electrode 101, the second positioning detection electrode 102, and the second electrode layer are disposed on the same layer.
Please refer to fig. 9, which is a schematic diagram of a modified embodiment of the foregoing embodiment, and the structure and implementation principle of the touch display panel are substantially the same as those of the touch display panel in the foregoing embodiment, except that: the first position detection electrode 101 and the second position detection electrode 102 are provided in a single layer on the first electrode layer. The first positioning detection electrode 101 and the second positioning detection electrode 102 are positioned between the glass cover plate 11 and the first electrode 12 at this time.
Referring to fig. 10, it is a schematic diagram of a modified embodiment of the above-mentioned embodiment, and the touch display panel has basically the same structure and implementation principle as the touch display panel in the above-mentioned embodiment, except that it further includes a plurality of other positioning detection electrodes disposed in a single layer 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 detection electrode 101 and the second positioning detection electrode 102 may also have other arrangements, as long as the touch position can be detected and positioned in the extending direction of the first electrode 12, which all fall 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 along a first direction, a plurality of second electrodes 24 extending along 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 positioning detection electrodes 201 and second positioning detection electrodes 202 disposed at two 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 detecting 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 may or may not intersect perpendicularly. The touch detection circuit 210 is configured to detect capacitance changes 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 locate a touch position of an external object (e.g., a finger). The data driving circuit 220 is used for providing current to the first electrode 22. The scan driving circuit 230 is connected to the second electrodes 24, and is configured to drive the second electrodes 24 by line scanning, so that the correspondingly scanned second electrodes 24 are grounded, and thus a current passes between the correspondingly scanned second electrodes 24 and the first electrodes 22, while the other second electrodes 24 that are not scanned are disconnected from being grounded and are not conducted with the first electrodes 22. The light-emitting layer may include light-emitting elements that emit red, green, blue, or the like, and that emit electroluminescence when current flows therethrough. By repeating the progressive scanning and the progressive display, when 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 changes in self-capacitance of the first electrode 22 and the first and second positioning detection electrodes 201 and 202, and locates 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 touch detection is completed 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, enters the display driving mode, and continues to display the next frame of image. In fact, the first electrode 22 functions as a touch detection electrode at the time of touch detection and functions 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 switch circuit 233 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 231 is connected to the control terminals of the switches, and is configured to generate and output a scan signal to the switches, and the switches are turned on or off under the control of the scan signal. The common voltage generating circuit 232 is connected to one conducting terminal of the plurality of switches, and the other conducting terminal of the plurality of switches is connected to the second electrode 24. The common voltage generating circuit 232 is used for generating a common voltage (Vcom) and providing the common voltage to the second electrode 24 connected correspondingly when the switch is turned on. The second electrode 24 is connected to ground when the correspondingly connected switch is switched off. The scan signal generating circuit 231 turns off the plurality of switches row by row, thereby grounding the second electrodes 24 row by row. In addition, only one second electrode 24 of the second electrodes 24 is grounded at the same 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, so that a light emitting layer disposed between the first electrode 22 and the second electrode 24, particularly a light emitting layer corresponding to an overlap of the plurality of first electrodes 22 and the second electrode 24, can generate electroluminescence. The magnitude of the current provided by the data driving circuit 22 to the first electrode 22 may be different, so the light emitting luminance of the light emitting layer corresponding to different overlapping positions of the first electrode 22 and the second electrode 24 may also be different.
The first positioning detection electrode 201 and the second positioning detection electrode 202 may be disposed on the layer of the first electrode 22, or on the layer of the second electrode 24, or on a single layer of the first electrode 22. A protective layer (e.g., a glass cover plate) may be disposed over the first electrode 22, and a user may perform a 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 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, 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 detecting 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 are perpendicular or non-perpendicular to each other. The touch detection circuit 310 is configured to detect changes 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 locate a touch position of an external object (e.g., a finger). The data driving circuit 320 is configured to provide a current to the first electrode 32. The scan driving circuit 330 is connected to the second electrodes 34, and is configured to drive the second electrodes 34 by scanning line by line, so that the second electrodes 34 corresponding to scanning are grounded, and thus a current passes between the second electrodes 34 corresponding to scanning and the first electrodes 32, and the other second electrodes 34 not being scanned are disconnected from the ground and are not connected to the first electrodes 32. The light-emitting layer may include light-emitting elements that emit red, green, blue, or the like, and that emit electroluminescence when current flows therethrough. By repeating the above-mentioned progressive scanning and progressive displaying, when 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 changes of the self-capacitances of the second electrode 34 and the first and second positioning detection electrodes 301 and 302, and locates the touch position of an external object (for example, a finger), wherein the locating includes 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 touch detection is completed 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, enters the display driving mode, and continues to display the next frame of image. In fact, the second electrode 34 functions as a touch detection electrode at the time of touch detection and functions 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 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 conducting terminal of the plurality of switches, and the other conducting terminal of the plurality of switches is connected to the second electrode 34. The common voltage generating circuit 332 is used for generating a common voltage and providing the common voltage to the second electrode 34 connected correspondingly when the switch is turned on. The second electrode 34 is connected to ground when the correspondingly connected switch is turned off. The scan signal generation circuit 331 turns off the plurality of switches row by row, thereby grounding the second electrodes 34 row by row. Also, the scan signal generating circuit 331 grounds only one of the second electrodes 34 at a time of the second electrodes 34. 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 a light emitting layer disposed between the first electrode 32 and the second electrode 34, particularly, a light emitting layer corresponding to an overlapping portion of the plurality of first electrodes 32 and the second electrode 34, can generate electroluminescence. The magnitude of the current provided by the data driving circuit 32 to the first electrode 32 may be different, so that the light emitting luminance of the light emitting layer corresponding to different overlapping positions of the first electrode 32 and the second electrode 34 may also be different. The first and second position detection electrodes 301 and 302 may be disposed on the layer on which the first electrode 32 is disposed, the layer on which the second electrode 34 is disposed, or 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 along a first direction, a plurality of second electrodes 44 extending along a second direction and overlapping with the first electrodes, a first positioning detection electrode 401 and a second positioning detection electrode 402 disposed at two sides of the first electrodes 42 and intersecting with an extension line 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 positioning detection electrode 401, and the second positioning detection electrode 402. The first direction and the second direction are perpendicular or not perpendicular. The touch detection circuit 410 is configured to detect capacitance changes 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 locate a touch position of an external object (e.g., a finger). The data driving circuit 420 is used for supplying current to the first electrode 22. The scan driving circuit 430 is connected to the second electrodes 44, and is configured to drive the second electrodes 44 by scanning line by line, so that the correspondingly scanned second electrodes 44 are grounded, and thus a current passes between the correspondingly scanned second electrodes 44 and the first electrodes 42, while the other second electrodes 44 that are not scanned are disconnected from the ground and are not conducted with the first electrodes 42. By repeating the above-mentioned progressive scanning and progressive displaying, when 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 changes in self-capacitance of the first electrode 42 and the first and second positioning detection electrodes 401 and 402, and locates 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 in a direction perpendicular to the extending direction of the first electrode 42. After the touch detection is completed on 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 driving mode, and continues to display the next frame of image. In fact, the first electrode 42 functions as a touch detection electrode at the time of touch detection and functions as a display driving electrode at the time of display driving.
The first positioning detection electrode 401 and the second positioning detection electrode 402 may be disposed on the layer of the first electrode 42, the layer of the second electrode 44, or a separate layer on the first electrode 42. A protective layer (e.g., a glass cover plate) may be disposed over the first electrode 42, and a user may perform a touch control operation by touching the protective layer. The layer positions of the first alignment detection electrode 401 and the second alignment detection electrode 402 are not particularly limited in the present invention.
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 that can be used for signal input and output. The plurality of first electrodes 42, the first positioning detection electrodes 401 and the second positioning detection electrodes 402 are connected to a first input/output terminal of the multiplexer 414, the charging module 416 is connected to one conducting terminal of the first switch K1, the other conducting 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 conducting 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 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.
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 NMOS transistors and PMOS transistors, and the first switch K1 and the second switch K2 are always not turned on or off at the same time by reasonably setting the control signal output by the control unit 415. 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 referred to as channels) by the multiplexer 414, each detection channel includes 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 amplification module 411. The operation of the touch detection circuit is described below by taking a detection channel as an example.
When the touch display panel is in a 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 turned on and the second switch K2 is turned off, the charging module 416 charges the touch detection capacitance 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 the first electrode 42 or the first positioning detection electrode 401 for touch detection and the second positioning detection electrode 402, which are connected to ground. When the first switch K1 is turned off and the second switch K2 is turned on, the touch detection capacitor discharges through the multiplexer 414 and a portion of the charge on the touch detection capacitor is transferred to a capacitor within the amplification module 411. With the first switch K1 and the second switch K2 being turned on and off continuously, the amplification module 411 performs signal amplification processing on a 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 a voltage signal output by the amplification 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 by 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 limited in this disclosure.
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 second switch K2, and further connected to the charging module 416 and the amplifying module 411.
Referring to fig. 14, the present invention further provides a touch detection method, including:
step S1, providing a plurality of first electrodes with a first extending direction and two positioning detection electrodes which are arranged at two sides of the first electrodes and intersect with the extending line of the first electrodes;
step S2, determining a coordinate of the touch position in a direction intersecting with an extending direction of the first electrode by detecting a magnitude of a self-capacitance of the first electrode;
in step S3, the coordinates of the touch position in the extending direction of the first electrode are determined by detecting the magnitude of the self-capacitance of the positioning detection electrode.
In a further embodiment, the touch detection method may further include: providing a plurality of second electrodes which have a second extending direction and are overlapped with the first electrodes and a light emitting layer arranged between the first electrodes and the second electrodes, wherein the first electrodes and the second electrodes jointly form a display area, and the first electrodes and the positioning detection electrodes jointly form a touch detection area.
In a further embodiment, the touch detection method may further include dividing the touch detection area into a plurality of touch key areas, and displaying a user interface next to the positioning detection electrode in the plurality of key areas.
The present invention further provides an electronic device, which may include a touch display panel according to any one or a combination of the above embodiments or adopt the touch detection method described in the above embodiments, and the electronic device may be a mobile phone, a tablet computer, a notebook computer, an electronic book, an electronic watch, an augmented reality/virtual reality apparatus, a human body motion detection apparatus, an automatic driving automobile, an intelligent home device, a security device, an intelligent robot, or other devices or apparatuses having a human-computer interaction function.
Compared with the prior art, the positioning detection electrodes are arranged on the two sides of the first electrode, the first electrode and the positioning detection electrodes including the first positioning electrode and the second positioning electrode can be used for detecting touch actions, the first electrode can position the touch position in the direction intersecting with the extending direction of the first electrode, the positioning detection electrodes can position the touch position in the extending direction of the first electrode, and the coordinate position of the touch position can be positioned from two different directions, 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 touch detection in a single direction is solved. In addition, the invention enables a user to touch the first electrode and the first positioning detection electrode or the first electrode and the second positioning detection electrode to be overlapped when the 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 size or the change of the self-capacitance of the first electrode, the first positioning detection electrode and the second positioning detection electrode can be detected; or the size or the change of the mutual capacitance between the first positioning detection electrode and the first electrode and the second positioning detection electrode and the first electrode are used for determining the two-dimensional coordinate direction of the touch position. The touch detection method can be used for the touch display panel, so that the touch detection method, the touch detection circuit, the touch display panel and the electronic equipment have better user experience.
The references to "length", "width", "upper", "lower", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the description of the invention may be made based on the references to the orientations and positional relationships illustrated in the drawings, which are intended to facilitate the description of the embodiments and the simplified description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means at least two, and "a plurality" means at least two unless specifically defined otherwise. In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, 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; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered 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 appended claims.

Claims (10)

1. A touch detection method, comprising:
providing a plurality of first electrodes with a first extending direction and two positioning detection electrodes which are arranged at two sides of the first electrodes and intersect with the extension lines of the first electrodes, wherein the positioning detection electrodes are arranged at different layers, and specifically: by configuring a user interface with a first positioning detection electrode and a second positioning detection electrode which are adjacent, when a user touches, the touch position and the first electrode and the first positioning detection electrode or the first electrode and the second positioning detection electrode are overlapped, and the two-dimensional coordinate direction of the touch position can be determined by detecting the self-capacitance of the first electrode and the self-capacitance of the first positioning detection electrode and the self-capacitance of the second positioning detection electrode;
judging the coordinate of the touch position in the direction intersecting the extending direction of the first electrode by detecting the self-capacitance of the first electrode; and
judging the coordinate of the touch position in the extending direction of the first electrode by detecting the self-capacitance of the positioning detection electrode or detecting the mutual capacitance between the positioning detection electrode and the first electrode;
wherein the method further comprises:
and calculating the self-capacitance according to the charge and discharge amount of the charge or the pulse voltage value.
2. The touch detection method according to claim 1, further comprising providing a plurality of second electrodes having a second extending direction and overlapping the first electrodes, and a light emitting layer disposed between the first electrodes and the second electrodes, the first electrodes and the second electrodes collectively constituting a display area, the first electrodes and the positioning detection electrodes collectively constituting a touch detection area.
3. The touch detection method according to claim 2, further comprising dividing the touch detection area into a plurality of touch key areas, and displaying a user interface next to the positioning detection electrode in the plurality of touch key areas.
4. The touch detection method according to claim 2, wherein the first electrode constitutes a first electrode layer, the second electrode constitutes a second electrode layer, and the positioning detection electrode is provided in the same layer as the first electrode, or the positioning detection electrode is provided in the same layer as the second electrode, or the positioning detection electrode is provided in a separate layer on the first electrode.
5. The touch detection method of claim 2, further comprising providing a touch detection circuit for detecting a self capacitance of the first electrode and detecting a self capacitance of the position detection electrode or a mutual capacitance between the position detection electrode and the first electrode.
6. The touch detection method according to claim 4, wherein the first electrode layer and the second electrode layer are of an ITO layer or a composite ITO/Ag/ITO layer structure, or 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 variation 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 according to the analog touch detection voltage signal, and the processor performs signal processing to obtain the touch detection result.
8. A touch detection circuit, characterized in that the touch detection circuit adopts the touch detection method as claimed in any one of claims 1 to 7.
9. A touch display panel, characterized in that the touch display panel employs the touch detection method of any one of claims 1 to 7, or the touch display panel comprises the touch detection circuit of claim 8.
10. An electronic device, wherein the touch detection method according to any one of claims 1 to 7 is adopted by the electronic device, or the electronic device comprises the touch display panel according to claim 9, and the electronic device is one of a mobile phone, a tablet 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 home device, a security device, and an intelligent robot.
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