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WO2013183925A1 - Procédé et appareil de détection de toucher - Google Patents

Procédé et appareil de détection de toucher Download PDF

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Publication number
WO2013183925A1
WO2013183925A1 PCT/KR2013/004938 KR2013004938W WO2013183925A1 WO 2013183925 A1 WO2013183925 A1 WO 2013183925A1 KR 2013004938 W KR2013004938 W KR 2013004938W WO 2013183925 A1 WO2013183925 A1 WO 2013183925A1
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WO
WIPO (PCT)
Prior art keywords
line
touch
sensing
driving
sensor node
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/004938
Other languages
English (en)
Korean (ko)
Inventor
오영진
정익찬
김준윤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crucialtec Co Ltd
Original Assignee
Crucialtec Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020130013249A external-priority patent/KR101553604B1/ko
Application filed by Crucialtec Co Ltd filed Critical Crucialtec Co Ltd
Publication of WO2013183925A1 publication Critical patent/WO2013183925A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; 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 OR CALCULATING; 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

Definitions

  • the present invention relates to an apparatus and method for detecting a touch, and more particularly, to a touch detection apparatus and a method for detecting a touch using mutual capacitance formed by a driving line and a sensing line.
  • the touch screen panel is a device for inputting a user's command by touching a character or a figure displayed on a screen of the image display device with a human finger or other contact means, and is attached to and used on the image display device.
  • the touch screen panel converts a contact position touched by a human finger or the like into an electrical signal, and the converted electrical signal is used as an input signal.
  • the capacitive touch panel converts a contact position into an electrical signal by detecting a change in capacitance that a conductive sensing pattern forms with other surrounding sensing patterns or ground electrodes when a human hand or an object comes in contact.
  • FIG. 1 is an exploded plan view of an example of a capacitive touch screen panel according to the related art.
  • the touch screen panel 10 may include a first sensor pattern layer 13, a first insulating layer 14, and a second sensor pattern layer sequentially formed on the transparent substrate 12 and the transparent substrate 12. 15) and the second insulating film layer 16 and the metal wiring 17. As shown in FIG.
  • the first sensor pattern layer 13 may be connected along the transverse direction on the transparent substrate 12.
  • the first sensor pattern layer 13 may be formed in a regular pattern in which a plurality of diamond shapes are connected in a line.
  • the first sensor pattern layer 13 may be formed of a plurality of Y patterns formed such that the first sensor pattern layers 13 positioned in one row having the same Y coordinate are connected to each other. ).
  • the second sensor pattern layer 15 may be connected along the column direction on the first insulating layer 14, and may be formed in the same diamond shape as the first sensor pattern layer 3, for example.
  • the second sensor pattern layer 15 is connected to each other, and the second sensor pattern layer 15 positioned in one column having the same X coordinate is connected to each other, and the first sensor pattern layer 13 does not overlap with the first sensor pattern layer 13. ) And alternately.
  • the second sensor pattern layer 15 is connected to the metal wires 17 in units of columns.
  • the first and second sensor pattern layers 13 and 15 may be made of a transparent conductive material such as indium tin oxide (ITO), and the first insulating layer 14 may be made of a transparent insulating material.
  • ITO indium tin oxide
  • One sensor pattern layer 13 and 15 is electrically connected to the driving circuit through the metal wire 17, respectively.
  • the first sensor pattern layer 13 and the second sensor pattern layer 15 are formed of a conductor, and each sensor pattern layer may include a plurality of lines connected along a row or column direction on the substrate.
  • Contact means for the touch screen panel 10 through a change in capacitance formed by the lines in the row direction arranged in the pattern layer 13 and the lines in the column direction arranged in the second sensor pattern layer 15. It is possible to find out the contact status and its location.
  • metal wiring is required to maintain low resistance. This metal wiring thickens the bezel at the edges of the touch screen and creates an additional mask process.
  • the amount of variation which is an output value detected in a sensor pattern
  • Vdrv alternating voltage
  • ADC analog-to-digital converter
  • a touch signal is obtained by using a change amount. Since a touch is detected using a touch capacitance Ct, which is a capacitance formed between a sensor pattern as a human finger or a contact means contacts, the touch is touched. The noise generated at the time affects the output value detected in the sensor pattern, and there is a problem that a touch recognition error may occur.
  • another object of the present invention is to reduce the parasitic capacitance generated in the sensor node in the touch detection device including a plurality of sensor nodes to improve the sensitivity of the touch detection.
  • the touch detection device which is arranged in a row or column direction and includes a plurality of sensor nodes consisting of a drive line and a sense line
  • the alternating voltage is applied Drive line
  • a sense line configured to output a voltage change in response to an alternating voltage applied to the drive line
  • a touch detector configured to detect a touch by detecting a voltage change amount of the sense line according to an alternating voltage applied to the driving line while the sense line is floated after charging.
  • the sensing line may correspond to the sensor node, and the driving line may correspond to one or more sensor nodes.
  • Each of the sensor nodes may be formed of a first group including one or more lines branched from the driving line and a second group including one or more lines branched from the sensing line and belonging to the first group. And one of the second lines belonging to the second group may be at least partially surrounded by the other.
  • Each of the sensor nodes includes the driving line formed of a first comb pattern having a first specific interval and the sensing line formed of a second comb pattern having a second specific interval, wherein the second comb pattern is the first comb pattern.
  • the first comb pattern and the second comb pattern may be interlocked with each other to be inserted between the comb patterns.
  • Each of the sensor nodes may include a sensing line having a specific interval of a continuous H shape and a driving line having a shape corresponding to the specific interval of the sensing line, and the driving line may be disposed to be inserted between the sensing lines. .
  • Each of the sensor nodes includes a first spiral-shaped drive line converged to a specific point within the sensor node at a specific interval, and a sensing of a second spiral shape corresponding to the interval in the first spiral shape.
  • the sensing line may be arranged to be inserted between the driving lines.
  • Each of the sensor nodes may include a sensing line having one or more branching lines branched radially from a specific point, and a driving line formed to surround the radial pattern of the sensing line.
  • the centers of the respective sensor nodes may be arranged to be shifted by a predetermined distance in the column direction from the center of the nearest sensor node among the sensor nodes arranged in adjacent columns.
  • the touch detection apparatus may further include a dummy line extending between the column and the column or between the row and the row of the sensor node.
  • the total area occupied by the driving line in the sensor node may be larger than the total area occupied by the sensing line.
  • the touch detection apparatus When the touch detection apparatus detects a touch of a specific sensor node among the plurality of sensor nodes, the touch detection apparatus applies an output terminal voltage of a specific sensing line constituting the specific sensor node to a driving line or sensing line constituting another sensor node. It may further include a damping unit for reducing the capacitance.
  • the attenuator includes a buffer, and an input terminal of the buffer is connected to an output terminal of the specific sensing line, and an output terminal of the buffer is connected to another driving line or sensing line except for the driving line and the sensing line constituting the specific sensor node. Can be.
  • the touch detection method of the touch screen panel including a plurality of sensor nodes arranged in a row or column direction and composed of a driving line and a sensing line, after the sensing line is charged Plotting; Applying an alternating voltage to the drive line; And detecting a touch by detecting a voltage change amount of the sense line according to an alternating voltage applied to the driving line in the floating state of the sense line.
  • the sensing line may correspond to the sensor node, and the driving line may correspond to one or more sensor nodes.
  • Each of the sensor nodes may be formed of a first group including one or more lines branched from the driving line and a second group including one or more lines branched from the sensing line and belonging to the first group. And one of the second lines belonging to the second group may be at least partially surrounded by the other.
  • the touch detection step may include attenuating parasitic capacitance by applying an output terminal voltage of a sensing line constituting a specific sensor node to be detected as touch to a driving line or sensing line constituting another sensor node.
  • the touch may be detected using mutual capacitance formed by the driving line and the sensing line.
  • the parasitic capacitance is attenuated by applying the output terminal voltage of the sensor node to be detected to the other sensor node, and thus the touch sensitivity Can be improved.
  • FIG. 1 is an exploded plan view of an example of a capacitive touch screen panel according to the related art.
  • 2 and 3 are exemplary diagrams of mutual capacitance formed between a drive line and a sense line.
  • FIG. 4 is an exploded plan view of a touch detection apparatus according to an exemplary embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a configuration of a touch detection apparatus according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a configuration of a touch detection apparatus according to another embodiment of the present invention.
  • FIG. 7 is a circuit diagram illustrating a touch detector according to an embodiment of the present invention.
  • FIG. 8 is an exemplary waveform diagram of a touch detector according to an embodiment of the present invention.
  • 9 and 10 are diagrams illustrating an example of a specific pattern of a sensor node according to an embodiment of the present invention.
  • FIG. 11 is a diagram illustrating an example of arranging a sensor node according to an embodiment of the present invention.
  • FIG. 12 is a diagram illustrating an example of attenuating parasitic capacitance in the touch detection apparatus according to another embodiment of the present invention.
  • 2 and 3 are diagrams for explaining such a touch detection method.
  • an electric field is formed between the two conductors according to the flow of flux, and the values form mutually unique capacitances, that is, mutual capacitances Cm. .
  • an arbitrary conductor for example, the first conductor C1 and the second conductor C2 is disposed on the upper surface of the structure including the first conductor C1 and the second conductor C2.
  • TSP touch screen panel
  • the first conductor C1 and the second are proportional to the amount of electric flux absorbed by the contact object.
  • the value of the mutual capacitance Cm between the conductors C2 is changed.
  • the touch screen panel according to the exemplary embodiment of the present invention may detect a touch by detecting a change in mutual capacitance Cm between the conductors C1 and C2.
  • the touch screen panel that performs touch detection in this manner is called a mutual touch screen panel.
  • the mutual touch screen panel includes a driving line to which a driving signal is applied and a sensing line providing a signal sensing point for touch detection.
  • the driving line and the sensing line are alternately disposed so as not to contact each other, and the driving line and the sensing line may correspond to the first conductor C1 and the second conductor C2 of FIG. 2, respectively.
  • FIG. 3 illustrates a situation in which a third object approaches the upper portions of the conductors C1 and C2 shown in FIG. 2.
  • a third object for example, a human finger (Finger) approaches over two conductors C1 and C2
  • the first conductor is larger than the distance between the first conductor C1 and the finger.
  • the distance between (C1) and the second conductor (C2) is relatively close, the total amount of flux absorbed by the finger is extremely smaller than the amount of flux transferred between the first conductor (C1) and the second conductor (C2). Lose.
  • the touch detection may be easily performed only when the distance between the first conductor C1 and the second conductor C2 and the distance between the first conductor C1 and the touch means (finger, etc.) are properly adjusted.
  • the distance between the first conductor and the finger is 'D'
  • the distance between the first conductor and the second conductor may be maintained at about 1/2 of 'D'.
  • Another embodiment of the touch detection method is a touch detection method for detecting a touch using a touch capacitance formed between the first conductor and the finger or between the second conductor and the finger.
  • this method has a problem of affecting the detection of the touch capacitance due to touch noise generated when a finger or the like is touched.
  • the influence on the touch noise may be minimized. . This is because the mutual capacitance Cm is formed between the conductor and the conductor, unlike the touch capacitance generated by the contact of the finger.
  • FIG. 4 is an exploded plan view of a touch detection apparatus according to an exemplary embodiment of the present invention
  • FIGS. 5 and 6 are views illustrating a detailed configuration of the touch detection apparatus 100 of FIG. 4.
  • the touch detection apparatus 100 includes a sensor node 110 and a driving device 200.
  • the touch detection apparatus 100 may include one or more sensor nodes 110 arranged in a row or column direction.
  • the sensor node 110 is an area configured by the driving line 120 and the sensing line 130, and may be referred to as a unit area for touch sensing. For example, when a touch input tool such as a finger or a conductor contacts the sensor node 110, the mutual capacitance Cm formed between the driving line 120 and the sensing line 130 may change. In this case, the touch may be detected.
  • the sensor node 110 may be formed by alternately arranging the driving line 120 and the sensing line 130.
  • the sensor node 110 according to another embodiment of the present invention may be an area corresponding to an intersection point at which the plurality of driving lines 120 and the plurality of sensing lines 130 cross each other, as shown in FIG. 6.
  • the sensor node 110 formed by the driving line 120 and the sensing line 130 will be described in more detail later.
  • a power source for example, an alternating voltage
  • the sensing line 130 outputs a signal for touch detection.
  • an alternating voltage alternated with a predetermined frequency is applied to the driving line 120, and the sensing line 130 outputs a signal corresponding to a touch state of the touch input tool in response to the alternating voltage.
  • the sensing line 130 may output a different voltage level value in response to the alternating voltage when the touch occurs and when the touch does not occur. This may result from the change in mutual capacitance Cm formed by the drive line 120 and the sense line 130.
  • the driving device 200 for driving the touch detection apparatus 100 may be formed on a circuit board such as a printed circuit board or a flexible circuit film, but is not limited thereto and may be directly mounted on a part of the substrate or the cover glass.
  • the driving device 200 may include a touch detector 210, a touch information processor 220, a memory 230, and a controller 240, and may be implemented as one or more integrated circuit (IC) chips.
  • the detector 210, the touch information processor 220, the memory 230, and the controller 240 may be separated from each other, or two or more components may be integrated and implemented.
  • the touch detector 210 may include a plurality of switches and a plurality of capacitors connected to the sensor node 110 and the signal wires.
  • the touch detector 210 receives a signal from the controller 240 and drives circuits for touch detection, Output the corresponding voltage.
  • the touch detector 210 may include an amplifier and an analog-to-digital converter.
  • the touch detector 210 may convert, amplify, or digitize the difference in the voltage change of the sensor node 110 and store the difference in the memory 230.
  • the touch detector 210 may detect a touch by detecting a change in mutual capacitance Cm formed between the driving line 120 and the sensing line 130 according to an alternating voltage.
  • the touch information processor 220 processes the digital voltage stored in the memory 230 to generate necessary information such as whether or not it is touched, a touch area, and touch coordinates.
  • the controller 240 may control the touch detector 210 and the touch information processor 220, may include a micro control unit (MCU), and perform predetermined signal processing through firmware.
  • MCU micro control unit
  • the memory 230 stores digital voltages and predetermined data used for touch detection, area calculation, and touch coordinate calculation or data received in real time based on the difference in the voltage change detected by the touch detector 210.
  • the attenuator 250 is further included in the driving device 200.
  • the attenuator 220 supplies the output terminal voltage of the specific sensing line including the specific sensor node, which is the current touch detection target, among the plurality of sensor nodes 110 to other sensor nodes.
  • the attenuation unit 220 may attenuate the parasitic capacitance Cp generated in other sensor nodes except for a specific sensor node that is a touch detection target among the plurality of sensor nodes.
  • the parasitic capacitance Cp refers to the capacitance accompanying the sensor node 110 and is a kind of parasitic capacitance formed by the sensor node 110, the driving line 120, the sensing line 130, and the like.
  • the parasitic capacitance Cp may be a concept including any parasitic capacitance generated by the touch detector 210, the touch panel, and the image display device. The function of the attenuation unit 220 will be described later in more detail.
  • the driving line 120 may correspond to one or more sensor nodes 110, while the sensing line 130 may be arranged to correspond to each of the sensor nodes 110.
  • the sensing lines 130 corresponding to each of the sensor nodes 110 are connected to each other, while the driving lines 120 arranged to correspond to the one sensor node 110 are separate from each other. It can be formed of a wiring.
  • the driving line 120 and the sensing line 130 may be alternately disposed so as not to overlap each other.
  • the driving line 120 and the sensing line 130 form geometric patterns such as a comb pattern, an antenna pattern, and a spiral pattern in the sensor node 110. In this regard, it will be described later with reference to FIGS. 9 and 10.
  • the plurality of driving lines 120 are disposed in one direction
  • the plurality of sensing lines 130 are disposed in the other direction
  • the intersection of the driving line 120 and the sensing line 130 is a sensor. It may also function as node 110.
  • the plurality of driving lines 120 and the plurality of sensing lines 130 may be formed in a regular pattern in which a plurality of diamonds or rods are arranged in a line.
  • the touch panel 100 of the mutual type is formed as an example in which the driving line 120 and the sensing line 130 are formed on different layers, the present invention is not limited thereto, and the driving line 120 is not limited thereto.
  • the sensing line 130 include a mutual touch panel formed on the same layer.
  • the sensor node 110 may be formed of two pattern layers. That is, the first pattern layer may include a plurality of driving lines 120 connected along the column direction on the substrate, and the second pattern layer may include a plurality of sensing lines 130 connected along the row direction. An area where the line 120 and the sensing line 130 intersect may be defined as the sensor node 110.
  • an insulating layer made of an insulating material may be included between the first pattern layer and the second pattern layer.
  • the direction in which the driving line and the sensing line are arranged may be changed. That is, a plurality of sensing lines may be disposed in the column direction, and a plurality of driving lines may be disposed in the row direction.
  • a row pattern and a column pattern may be formed together on one substrate, and an insulating material may be formed at a portion where the row pattern and the column pattern cross each other.
  • FIG. 7 is a circuit diagram illustrating a touch detector 210 according to an embodiment of the present invention
  • FIG. 8 is an exemplary waveform diagram of the touch detector 210 according to an embodiment of the present invention.
  • the touch detector 210 may include a charger 211 and an alternating voltage generator 212.
  • the charging unit 211 floats the sensing line 130 after charging.
  • the charging unit 211 is connected to the sensing line 130 to supply the charging signal Vb.
  • the charging unit 211 may be a three-terminal switching device that performs a switching operation according to a control signal supplied to the on / off control terminal, or may be a linear device such as an OP-AMP that supplies a signal according to the control signal.
  • the alternating voltage generation unit 212 applies an alternating voltage to the driving line 120. That is, the alternating voltage generator 212 applies an alternating voltage alternated at a predetermined frequency to the output terminal of the driving line 120 to change the potential.
  • the alternating voltage generator 212 may generate a clock signal having the same duty ratio, but may generate an alternating voltage having a different duty ratio.
  • the sensing line 130 When the charging signal Vb is applied to the input terminal of the charging unit 211 while the charging unit 211 is turned on, the sensing line 130 is charged. After that, when the charging unit 211 is turned off, the signal charged in the sensing line 130 is isolated in a charged state unless it is discharged separately. This isolated state is called a floating state.
  • the floating state refers to an isolated state in a charged state unless the charged signal is turned off by the charging unit 211 to charge the electric charge and then the charging unit 211 is turned off.
  • the input terminal of the sense line 130 may have a high impedance to stably isolate the charged charge.
  • the thickness of one or more lines branching from the sensing line 130 or the sensing line 130 present on the sensor node 110 region is diverted from the driving line 120 or the driving line 120. It may be implemented to have a high impedance by making it smaller.
  • the charging unit 211 charges the sensing line 130 by applying a charging signal Vb.
  • the charging signal Vb may continuously maintain a high signal or may be in the form of a clock signal having a constant frequency, as shown in FIG. 8.
  • the charging signal Vb may be applied to charge the sensing line 130.
  • the switch SW has a constant frequency and can be switched on / off.
  • the sensing signal 130 may be in a floating state by being isolated from a state in which the charging signal Vb is charged.
  • the level of the output node voltage Vo of the sensing line 130 is changed. For example, when the alternating voltage KB drops from 5V to 0V, the output node voltage Vo of the sense line 130 also falls, and conversely, when the alternating voltage KB rises from 0V to 5V, sensing The output node voltage Vo of line 130 also rises.
  • the output node Vo of the sensing line 130 may be adjusted. It can be seen that the change amount ⁇ V appears differently during non-touch and touch. This is due to the change in the mutual capacitance Cm formed between the sense line 130 and the drive line 120, when the touch occurs or does not occur, the output node voltage change amount ⁇ V of the sense line 130. This is because the value is different.
  • the voltage change amount of the sensing line 130 between touch and non-touch can be obtained, and the same signal inside the touch detection apparatus 100 (for example, a controller) can be used.
  • the method of detecting touch using the touch capacitance Ct affects the output voltage Vo detected at the sensor node 110 by touch noise generated when a finger or the like touches the touch.
  • the detection apparatus 100 may reduce the influence due to touch noise by allowing the mutual capacitance Cm formed by the driving line 120 and the sensing line 130 to replace the touch capacitance Ct. Therefore, the touch detection apparatus 100 according to the exemplary embodiment may detect the touch according to the change of the mutual capacitance Cm instead of the touch capacitance Ct.
  • FIGS. 9 and 10 are diagrams illustrating an example of a specific pattern of a sensor node according to an embodiment of the present invention, and show a sensor node pattern in the touch detection apparatus as described with reference to FIG. 5.
  • FIG. 9 shows a specific pattern in one sensor node
  • FIG. 10 shows the state of sensor nodes arranged in four rows and four columns.
  • the driving line 120 and the sensing line 130 are alternately arranged so as not to overlap each other to form the sensor node 110.
  • each of the sensor nodes 110 includes a first group including one or more lines branched from the drive line 120 and a first group including one or more lines branched from the sense line 130. It is formed in two groups, one of the first line belonging to the first group and the second line belonging to the second group is formed in a form at least partially surrounded by the other.
  • the total area occupied by the driving line 120 in one sensor node 110 may be larger than the total area occupied by the sensing line 130.
  • the thickness of the one or more lines branched from the drive line 120 may be greater than the thickness of the one or more lines branched from the sense line 130.
  • the sensing line 130 needs to be charged and then maintained in a floating state for a predetermined time. Since the floating state is vulnerable to external noise, the stability In order to ensure the output terminal of the sense line 130 should have a high impedance. Therefore, when the thickness of the at least one line branched from the sense line 130 is smaller than the thickness of the at least one line branched from the drive line 120, the sense line 130 may have a high impedance, thereby providing a stable floating state. Will be able to maintain.
  • the sensor node 110 may have a comb pattern.
  • the sensor node 110 includes a driving line 120 formed in a first comb pattern having a first specific interval and a sensing line 130 formed in a second comb pattern having a second specific interval.
  • the second comb pattern may be interposed between the first comb pattern to arrange the first comb pattern and the second comb pattern.
  • the sensor node 110 may have an antenna pattern.
  • the sensor node 110 is composed of a sensing line 130 having a specific spacing of a continuous H shape and a driving line 120 having a shape corresponding to the specific spacing of the sensing line 130, and the driving line 120 senses the sensing line 130. It may be arranged to be inserted between the lines 130.
  • the sensor node 110 may have a spiral pattern.
  • the sensor node 110 has a spiral-shaped drive line 120 that converges to a specific point within the sensor node 110 at a specific interval, and the gap that exists in the spiral shape (gap between the drive lines 120).
  • Consists of a sensing line 130 having a spiral shape corresponding to a shape formed by the sensing line 130, and the sensing line 130 may be disposed to be inserted between the driving lines 120.
  • the sensor node 110 may be formed in a geometric pattern.
  • a sensing line 130 having one or more branching lines branching radially from a specific point in the sensor node 110, and a driving line formed to surround the radial pattern of the sensing line 130. 120.
  • at least one line perpendicular to the length direction of the branch line may be further formed at each branch line forming a radial shape of the sensing line 130.
  • FIG. 10 is a view in which the sensor node 110 in FIG. 9 is expanded in a 4x4 matrix, and corresponds to FIG. 9 from (a) to (d).
  • the driving line 120 constituting the sensor nodes 110 belonging to the same column may be branched from one common driving line.
  • the driving lines arranged in the same column may be connected to each other, and an alternating voltage may be commonly applied.
  • the sensing line 130 may be formed independently for each sensor node 110.
  • the touch detection apparatus 100 may include a dummy line 140 extending in a column direction.
  • the dummy line 140 may be disposed between the column and the column of the sensor node 110.
  • disposing the dummy line is to prevent interference (eg, an influence of parasitic capacitance due to the relationship between the sensor nodes 110) that may exist in the relationship between adjacent sensor nodes 110.
  • FIGS. 9 and 10 illustrate an example of a pattern formed by the driving line 120 and the sensing line 130 in the sensor node 110, the embodiment of the present invention is not limited thereto, and the driving line 120 is not limited thereto.
  • One or more lines branched from) and one or more branches branched from sense line 130 are to be understood as not departing from the scope of the present invention if the lines are arranged so as not to overlap each other to form a predetermined pattern.
  • FIG. 11 is a diagram illustrating an example of arranging a sensor node according to another exemplary embodiment of the present invention.
  • 11 (a) and 11 (b) show only a part of the sensor node included in the touch detection apparatus 100 to explain the arrangement of the sensor nodes.
  • the positions of the sensor nodes shown in FIG. 10A are arranged differently. Specifically, the sensor nodes are arranged side by side in the column direction, but are not disposed in the same row as adjacent sensor nodes in the row direction, but are arranged to be shifted by a predetermined interval. For example, the center of a particular sensor node may be shifted by a predetermined distance in the column direction from the center of the nearest sensor node disposed in an adjacent column.
  • the predetermined interval may be about 1/2 of the length in the column direction of the sensor node, but is not limited thereto.
  • a point where a touch is made is referred to as a touch area 'TA'.
  • the touch area TA spans two sensor nodes. At this time, the touch is detected from the change in the mutual capacitance Cm formed at each of the two corresponding sensor nodes.
  • the touch area TA is spread over three sensor nodes, and the mutual capacitance Cm formed at each of the three corresponding sensor nodes is measured. The touch is detected from the change.
  • the sensor nodes are arranged in at least partially displaced form compared to the form in which the sensor nodes are arranged side by side in the row and column directions (FIG. 11A) (FIG. 11B).
  • the touch area TA in the spans more sensor nodes, and thus touch generation is detected from more sensor nodes, the accuracy of touch detection can be further improved.
  • the sensor node 110 is formed of the driving line 120 and the sensing line 130, and the touch is detected through the change of the mutual capacitance Cm formed thereby. As a result, the influence of touch noise generated during touch can be minimized.
  • FIG. 12 is a diagram illustrating a configuration of a touch detection apparatus according to another embodiment of the present invention.
  • FIG. 12 is a diagram for describing the configuration and operation of the touch detection apparatus illustrated in FIG. 6.
  • the driving line 120 and the sensing line 130 may be provided in plural numbers and may be disposed to cross each other. In this case, an area where the driving line 120 and the sensing line 130 cross each other may function as the sensor node 110.
  • the mutual capacitance Cm occurring at the sensor node 110 is used to detect whether or not it is touched.
  • the mutual capacitance Cm ' is generated not only in the specific sensor node 110 that is a touch detection target, but also in other sensor nodes, the total capacitance Cm' generated in other sensor nodes except the specific sensor node. It acts as a parasitic capacitance.
  • the touch detection object is a 'Tx2Rx2' sensor node
  • the mutual capacitance Cm is generated between the driving line Tx2 and the sensing line Rx2 that cross the 'Tx2Rx2' sensor node, respectively.
  • the mutual capacitance (Tx1Rx1, Tx1Rx2, ..., TxnRxn) is also applied to the other sensor nodes (Tx1Rx1, Tx1Rx2, ..., TxnRxn) where the driving lines Tx1, Tx2, Tx3, ..., Txn and the respective sensing lines (Rx1, Rx2, Rx3, ..., Rxn) intersect.
  • Cm ') may cause the mutual capacitances Cm' generated at other sensor nodes except for the specific sensor node to be detected whether or not to touch the specific sensor node.
  • the parasitic capacitance Cp is reduced by using the attenuator 250 to improve the touch sensitivity.
  • the capacitance C When the vicinity of conductors charged with different polarities is surrounded by a material having a dielectric constant ( ⁇ ), the amount of charge (Q) collected in the conductor according to the magnitude of the potential between the conductors is called the capacitance (C). That is, the capacitance C may be expressed by Equation 1 below.
  • the capacitance C is proportional to the area A of the conductor and inversely proportional to the distance d between the conductors.
  • a dielectric material such as glass or OCA exists between the first pattern layer and the second pattern layer of the sensor node 110, and the first pattern layer and the second pattern are present.
  • the layers are insulated from each other through these dielectric materials.
  • the driving line 120 or the sensing line 130 disposed on the first pattern layer and the second pattern layer is formed of a conductor, and the touch detection device includes a structure including a large number of conductors and a dielectric material present in the vicinity thereof. It has a capacitor structure that forms a capacitance.
  • each conductor driving line or sensing line
  • the distance between the conductors and the dielectric constant ( ⁇ ) of the dielectric material present between the conductors cause unwanted capacitance to be formed, which is the parasitic capacitance Cp. do.
  • the parasitic capacitance Cm 'generated by another sensor node in addition to the mutual capacitance Cm of the specific sensor node 110 may be the parasitic capacitance Cp.
  • the arrangement of the conductors is very dense and many are distributed. Therefore, the amount of parasitic capacitance Cp generated thereby becomes very large. Therefore, attenuating or compensating such parasitic capacitance Cp becomes an important factor affecting the performance related to touch detection in the touch screen panel.
  • the attenuator 250 may change the output terminal voltage of the specific sensing line Rx2 including the sensor node Tx2Rx2, which is the current touch detection target among the plurality of sensor nodes, to different sensor nodes Tx1Rx1 and Tx1Rx2. , ..., TxnRxn). That is, the attenuator 250 may include a driving line crossing the output terminal voltage of the specific sensing line Rx2 including the sensor node Tx2Rx2 that is currently detected as a touch among the plurality of sensor nodes at the specific sensor node Tx2Rx2. It may be supplied to other drive lines Tx1, Tx3, ..., Txn and sense lines Rx1, Rx3, ..., Rxn, respectively, except for Tx2) and sense line Rx2.
  • the attenuator 250 may prevent shorts between the driving lines Tx1, Tx2, Tx3,..., Txn or the sensing lines Rx1, Rx2, Rx3,..., Rxn that are arranged in isolation. It may include a buffer 251. As illustrated in FIG. 12, an output terminal voltage of a specific sensing line including a sensor node currently selected as a touch detection object is input to other driving lines and sensing lines through the buffer 251 of the attenuator 250. That is, the input terminal of the buffer 251 is connected to the output terminal of the specific sensing line Rx2 including the sensor node Tx2Rx2 which is the current touch detection target, and the output terminal of the buffer 251 is connected to the specific driving line Tx2 and the specific terminal. It may be connected to the driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn except for the sensing line Rx2, respectively.
  • the attenuator 250 includes driving lines Tx1 and Tx3 that cross the output terminal voltage of the specific sensing line Rx2 including the specific sensor node Tx2Rx2 at another sensor node adjacent to the specific sensor node Tx2Rx2. And sensing lines Rx1 and Rx3.
  • C is the capacitance value of the structure
  • V is the potential difference between the two conductors.
  • the capacitance C is proportional to the charge capacity of the charge, if the amount of charge Q to be charged is close to zero, it means that the capacitance C formed by the relationship between conductors also converges close to zero.
  • the present embodiment uses the above-described principle.
  • the present embodiment is adjacent to the sensing line Rx2 including the corresponding sensor node Tx2Rx2.
  • the parasitic capacitance Cp affecting the detection of touch is controlled by controlling the potentials of the existing driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn to be close to the same level. Compensation to be close to '0'.
  • the output terminal voltage of the specific sensing line Rx2 including the sensor node Tx2Rx2, which is the current touch detection target among the sensor nodes, is stored through the buffer 251 of the attenuation unit 250.
  • the specific sensing line Rx2 When applied to the other driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn except for the specific driving line Tx2 and the specific sensing line Rx2, respectively, the specific sensing line Rx2 ), The potential difference between the other driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn is minimized, and thus parasitic capacitance generated in the sensor node can be effectively attenuated.
  • the most contributing part of the parasitic capacitance Cp that is, the mutual capacitance Cm 'formed at the sensor node other than the specific sensor node through the attenuator 250 may be reduced to the minimum.
  • the buffer 251 is a driving line (Tx1, Tx3, ..., Txn) or a sensing line (Rx1, Rx3, ..., different from the sense line (Rx2) including the sensor node (Tx2Rx2) to be detected the current touch.
  • Rxn may be implemented as a buffer amplifier (buffer amplifier) that functions to prevent shorts, adjust signals, and prevent interference.
  • the output terminal voltage of the sensing line Rx2 including the sensor node Tx2Rx2 to be detected is applied as it is to the other driving lines Tx1, Tx3, ..., Txn and the sensing lines Rx1, Rx3, ..., Rxn.
  • the gain of the buffer amplifier must be 1, but may be changed as necessary. That is, the gain of the buffer 251 included in the attenuation unit 250 may be changed to bring the potential difference between the sensor nodes close to '0'.
  • the parasitic capacitance generated in the other sensor node may be suppressed by the attenuation unit 250, thereby minimizing the parasitic capacitance and improving the sensitivity of the detection of touch occurrence. Can be.
  • FIG. 12 illustrates only the function of the attenuator 250 in the touch detection device having the configuration as described with reference to FIG. 6, the attenuator 250 may perform the same function in the touch detection device described with reference to FIG. 5. have.
  • the attenuation unit 250 outputs the voltage at the output line of the sense line 130 at the sensor node 110 to which the touch is currently detected.
  • the influence of the parasitic capacitance can be minimized.

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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)
PCT/KR2013/004938 2012-06-04 2013-06-04 Procédé et appareil de détection de toucher Ceased WO2013183925A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR10-2012-0060010 2012-06-04
KR20120060010 2012-06-04
KR10-2012-0096676 2012-08-31
KR20120096676 2012-08-31
KR10-2013-0013249 2013-02-06
KR1020130013249A KR101553604B1 (ko) 2012-06-04 2013-02-06 터치 검출 장치 및 방법
KR10-2013-0024589 2013-03-07
KR1020130024589A KR101461926B1 (ko) 2012-06-04 2013-03-07 기생 정전용량을 감쇄하는 터치 검출 장치 및 방법

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Publication number Priority date Publication date Assignee Title
WO2015174581A1 (fr) * 2014-05-12 2015-11-19 주식회사 동부하이텍 Panneau tactile
WO2016017879A1 (fr) * 2014-07-30 2016-02-04 주식회사 동부하이텍 Dispositif intelligent et son procédé de commande
WO2016032085A1 (fr) * 2014-08-29 2016-03-03 주식회사 동부하이텍 Procédé pour balayer un panneau tactile et circuit intégré tactile pour le réaliser

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US20060097991A1 (en) * 2004-05-06 2006-05-11 Apple Computer, Inc. Multipoint touchscreen
WO2009096712A2 (fr) * 2008-01-29 2009-08-06 Melfas Appareil tactile présentant une structure de prévention de la capacité parasite
KR20110057501A (ko) * 2009-11-24 2011-06-01 삼성모바일디스플레이주식회사 터치 스크린 시스템 및 그 구동방법
KR101147616B1 (ko) * 2010-01-08 2012-05-24 세심광전자기술(주) 정밀도가 높은 단일층 터치스크린 장치 및 위치 결정방법
KR20120055354A (ko) * 2010-11-23 2012-05-31 삼성전자주식회사 입력 감지 소자 및 이를 구비한 터치 패널

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US20060097991A1 (en) * 2004-05-06 2006-05-11 Apple Computer, Inc. Multipoint touchscreen
WO2009096712A2 (fr) * 2008-01-29 2009-08-06 Melfas Appareil tactile présentant une structure de prévention de la capacité parasite
KR20110057501A (ko) * 2009-11-24 2011-06-01 삼성모바일디스플레이주식회사 터치 스크린 시스템 및 그 구동방법
KR101147616B1 (ko) * 2010-01-08 2012-05-24 세심광전자기술(주) 정밀도가 높은 단일층 터치스크린 장치 및 위치 결정방법
KR20120055354A (ko) * 2010-11-23 2012-05-31 삼성전자주식회사 입력 감지 소자 및 이를 구비한 터치 패널

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015174581A1 (fr) * 2014-05-12 2015-11-19 주식회사 동부하이텍 Panneau tactile
KR20150129355A (ko) * 2014-05-12 2015-11-20 주식회사 동부하이텍 터치 패널
KR101588521B1 (ko) 2014-05-12 2016-01-25 주식회사 동부하이텍 터치 패널
WO2016017879A1 (fr) * 2014-07-30 2016-02-04 주식회사 동부하이텍 Dispositif intelligent et son procédé de commande
WO2016032085A1 (fr) * 2014-08-29 2016-03-03 주식회사 동부하이텍 Procédé pour balayer un panneau tactile et circuit intégré tactile pour le réaliser

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