WO2021172645A1 - Capteur tactile et son procédé de commande - Google Patents

Capteur tactile et son procédé de commande Download PDF

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Publication number
WO2021172645A1
WO2021172645A1 PCT/KR2020/003507 KR2020003507W WO2021172645A1 WO 2021172645 A1 WO2021172645 A1 WO 2021172645A1 KR 2020003507 W KR2020003507 W KR 2020003507W WO 2021172645 A1 WO2021172645 A1 WO 2021172645A1
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WIPO (PCT)
Prior art keywords
sensing
data
sensing node
touch
row
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PCT/KR2020/003507
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English (en)
Korean (ko)
Inventor
박지헌
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주식회사 에이코닉
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Publication of WO2021172645A1 publication Critical patent/WO2021172645A1/fr

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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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
    • 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
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04186—Touch location disambiguation

Definitions

  • the present invention relates to a touch sensor and a method of driving the same, and more particularly, to a touch sensor capable of improving touch sensitivity by removing the influence of display noise and a method of driving the same.
  • Such display devices include a liquid crystal display device, a field emission display device, a plasma display device, and an organic light emitting display device. .
  • an organic light emitting display device displays an image using an organic light emitting diode that generates light by recombination of electrons and holes, which has a fast response speed and is driven with low power consumption.
  • a recent display device includes a touch sensor for receiving a user's touch as well as an image display function. Accordingly, the user can more conveniently use the display device through the touch sensor.
  • the capacitive touch sensor detects the point where the capacitance changes according to the contact of a person's hand or an object to detect the touch position,
  • the touch detection is easy and the accuracy is excellent, so it has been widely used recently.
  • the spatial distance between the display panel and the touch sensor has been reduced according to the trend of flexible organic light emitting display devices and miniaturization and thinness, and accordingly, the size of display driving noise induced by the touch sensor is increased to obtain the desired touch sensing sensitivity. It is reaching a level where it becomes impossible.
  • noise data is calculated for each row of the sensing node using a touch sensing unit including a plurality of sensing nodes composed of j rows, and sensing data output from the touch sensing unit. and a touch calculator that calculates touch data by subtracting the calculated total noise data from the sensing data corresponding thereto when the noise data calculation for each row is completed by the noise calculator,
  • the calculator sets the noise data of each sensing node included in the m (1 ⁇ m ⁇ j)-th row to the sensing data received from the touch sensing unit, and a touch event occurs at the n-th sensing node included in the m-th row.
  • the noise data of the n-th sensing node may be updated to a value obtained by adding the tracking change amount to the noise data of the n-1st sensing node included in the m-th row.
  • the noise calculator when the sum of the tracking change amount to the difference in the sensed data of the n-th sensing node and the n-1 th sensing node is greater than a preset threshold value, the touch event occurs at the n-th sensing node can be judged as
  • the tracking change amount is set as an average value of a difference in sensing data from a previous sensing node for each sensing node included in the m-th row, or at least one sensing node located before the n-th sensing node. It may be set to a value obtained by averaging the difference between the sensing data and the sensing node.
  • the noise calculator when the sum of the tracking change amount to the difference between the sensing data of the n-th sensing node and the n-1 th sensing node is greater than a preset threshold value, the n-th sensing node together with the n- It may be determined that a touch event has occurred in the first sensing node and the n+1th sensing node.
  • the touch sensing unit includes driving electrodes and sensing electrodes that are disposed to cross each other, the driving electrodes are formed to be elongated in a row direction, a plurality of the driving electrodes are arranged along a column direction, and receive a touch driving signal;
  • the sensing electrodes may be elongated in the column direction, arranged in plurality along the row direction, and may provide the sensing data to the noise calculator.
  • a method of driving a touch sensor includes: acquiring sensing data for each sensing node from a touch sensing unit including a plurality of sensing nodes composed of j rows and k columns; Comprising the steps of calculating noise data for each row of the sensing node, and when the calculation of the noise data for each row is completed, calculating touch data by subtracting the calculated total noise data from the sensing data corresponding thereto; In the step of calculating noise data for each row of the sensing node using the sensing data, the noise data of each sensing node included in the m (1 ⁇ m ⁇ j)-th row is converted into sensing data received from the touch sensing unit.
  • noise data of the n-th sensing node is added to the n-1th sensing node included in the m-th row. It can be updated as a value obtained by adding the tracking change amount to the noise data of the sensing node.
  • the step of calculating the noise data for each row of the sensing node using the sensing data includes a value obtained by adding the tracking change amount to the difference between the sensing data of the nth sensing node and the n ⁇ 1st sensing node. If it is greater than the threshold, it may be determined that a touch event has occurred in the nth sensing node.
  • the tracking change amount is set as an average value of a difference in sensing data from a previous sensing node for each sensing node included in the m-th row, or at least one sensing node located before the n-th sensing node. It may be set to a value obtained by averaging the difference between the sensing data and the sensing node.
  • the step of calculating the noise data for each row of the sensing node using the sensing data includes a value obtained by adding the tracking change amount to the difference between the sensing data of the nth sensing node and the n ⁇ 1st sensing node. If it is greater than the threshold value, it may be determined that a touch event has occurred in the n-1 th sensing node and the n+1 th sensing node together with the n th sensing node.
  • the touch sensing unit includes driving electrodes and sensing electrodes that are disposed to cross each other, the driving electrodes are formed to be elongated in a row direction, a plurality of the driving electrodes are arranged along a column direction, and receive a touch driving signal;
  • the sensing electrodes are formed to be elongated in the column direction, and are arranged in plurality along the row direction to provide the sensing data.
  • FIG. 1 is a diagram schematically illustrating a display device including a touch sensor according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating in detail the configuration of a display device having a touch sensor according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a touch sensing unit and a touch control unit according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a touch map reconstructed through sensing data output from a touch sensing unit according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a touch map from which display noise is removed by the touch controller according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a method of driving a touch sensor according to an embodiment of the present invention.
  • FIG. 7A to 7F are diagrams for explaining a method of driving the touch sensor illustrated in FIG. 6 .
  • FIG. 8 is a diagram illustrating a method of driving a touch sensor according to another embodiment of the present invention.
  • 9A to 9F are diagrams for explaining a method of driving the touch sensor illustrated in FIG. 8 .
  • ⁇ unit (unit) means a unit that processes at least one function or operation, which is hardware, software, or hardware and a combination of software.
  • terms such as “comprises”, “comprises” or “have” described in the present specification mean that the corresponding component may be embedded, so other components are excluded. Rather, it should be construed as being able to include other components further.
  • each constituent unit in the present specification is merely a classification for each main function that each constituent unit is responsible for. That is, two or more components to be described below may be combined into one component, or one component may be divided into two or more for each more subdivided function.
  • each of the constituent units to be described below may additionally perform some or all of the functions of other constituent units in addition to the main function it is responsible for. Of course, it may be carried out by being dedicated to it.
  • FIG. 1 is a diagram schematically showing a display device having a touch sensor according to an embodiment of the present invention
  • FIG. 2 is a diagram showing the configuration of a display device having a touch sensor according to an embodiment of the present invention in detail.
  • a display device including a touch sensor includes a touch sensor 100 , a display panel 210 , a display driving circuit 220 , and a host 250 . can do.
  • the touch sensor 100 may include a touch sensing unit 110 and a touch control unit 120 .
  • the touch sensing unit 110 may be positioned on the display panel 210 to perform a role of receiving a touch input by a user.
  • a plurality of electrodes may be provided to sense a change in capacitance due to the touch.
  • the touch control unit 120 controls the touch sensing unit 110 , and by sensing a change in capacitance using the sensing data output from the touch sensing unit 110 , it is possible to detect whether a touch event occurs and a location.
  • the touch sensor 100 composed of the above-described touch sensing unit 110 and touch control unit 120 may operate as a capacitive touch sensor.
  • the touch sensing unit 110 may be connected to the main FPCB 202 through a first flexible printed circuit board (FPCB) 201, and the touch control unit 120 is formed in the form of an integrated circuit (Integrated Circuit) to form a first FPCB It may be located on (201).
  • FPCB flexible printed circuit board
  • the touch controller 120 may transmit/receive signals to and from the host 250 located in the main FPCB 202 .
  • the location of the touch control unit 120 is not limited thereto, and may be located in another location such as the main FPCB 202 .
  • the display panel 210 includes a plurality of pixels, and a predetermined image may be displayed through the pixels.
  • the display panel 210 may display an image under the control of the display driving circuit 220 .
  • the display panel 210 may be implemented as an organic light emitting display panel.
  • the display driving circuit 220 may control an image display operation of the display panel 210 by supplying a display driving signal to the display panel 210 .
  • the display driving circuit 220 may generate a display driving signal by using the digital image data DAT and the timing signal Ts supplied from the outside.
  • the display driving circuit 220 may receive the image data DAT and the timing signal Ts from the host 250 , and the timing signal Ts may include a vertical synchronization signal and a horizontal synchronization signal.
  • the signal may include a horizontal synchronization signal, a main clock signal, a data enable signal, and the like.
  • the display driving signal may include a scan signal, a data signal, and the like.
  • the display driving circuit 220 may be formed in the form of an integrated circuit and mounted on the display panel 210 . In addition, it may be connected to the main FPCB 202 through the second FPCB 203 , and accordingly, the display driving circuit 220 may transmit/receive a signal to/from the host 250 located in the main FPCB 202 .
  • the position of the display driving circuit 220 is not limited thereto, and for example, may be connected to the display panel 210 through a separate component (eg, FPCB).
  • FPCB separate component
  • the touch control unit 120 and the display driving circuit 220 may be separately located as shown, but is not limited thereto. That is, the touch controller 120 and the display driving circuit 220 may be integrated into one chip.
  • data may be exchanged with the touch controller 120 and the display driving circuit 220 through an interface.
  • the host 250 and the touch controller 120 transmit and receive data through a low-frequency control interface such as I2C for transmitting touch coordinate information, and the host 250 and the display driving circuit 220 transmit image data.
  • a high-speed data interface such as MIPI can be used.
  • the display driving circuit 220 may include a scan driver 221 , a data driver 222 , and a timing controller 223 .
  • the scan driver 221 may supply a scan signal to the display panel 210
  • the data driver 222 may supply a data signal to the display panel 210 .
  • the timing controller 223 may control the operations of the scan driver 221 and the data driver 222 , and may receive digital image data DAT and a timing signal Ts from the host 250 for this purpose.
  • FIG. 3 is a view showing a touch sensing unit and a touch control unit according to an embodiment of the present invention
  • FIG. 4 is a view showing a touch map reconstructed through sensing data output from the touch sensing unit according to an embodiment of the present invention
  • 5 is a diagram illustrating a touch map from which display noise is removed by the touch controller according to an embodiment of the present invention.
  • the touch sensing unit 110 may include a plurality of touch electrodes Tx and Rx.
  • the touch electrodes Tx and Rx include a plurality of driving electrodes (or, referred to as transmitting electrodes, Tx1 to Txj) and a plurality of sensing electrodes (or, referred to as receiving electrodes, Rx1 to Rxk). can do.
  • the driving electrodes Tx1 to Txj may be formed to be elongated in the row direction (eg, the X-axis direction), and a plurality of the driving electrodes Tx1 to Txj may be arranged along a column direction (eg, the Y-axis direction) crossing the row direction.
  • the sensing electrodes Rx1 to Rxk may be formed to be elongated in a column direction (eg, a Y-axis direction), and a plurality of sensing electrodes Rx1 to Rxk may be arranged along a row direction (eg, an X-axis direction).
  • the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk are positioned to cross each other, thereby operating as a capacitive touch sensor.
  • the intersection of the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk may form a plurality of sensing nodes, and when a touch event occurs in the touch sensor 100 , a position (sensing) associated with the touch event node) will change the mutual capacitance.
  • a touch position may be detected by detecting a change in capacitance of the sensing node.
  • a plurality of sensing nodes including j rows and k columns may be formed through j driving electrodes Tx1 to Txj and k sensing electrodes Rx1 to Rxk that are intersected with each other.
  • each of the driving electrodes Tx1 to Txj includes a plurality of first touch sensing cells 411 arranged at a predetermined interval along a row direction (eg, an X-axis direction), and the first touch A plurality of first connection patterns 412 for electrically connecting the sensing cells 411 to each other may be included.
  • each of the sensing electrodes Rx1 to Rxk includes a plurality of second touch sensing cells 421 arranged at a predetermined interval along a column direction (eg, a Y-axis direction), and the second touch sensing A plurality of second connection patterns 422 that electrically connect the cells 421 to each other may be included.
  • the second touch sensing cells 421 may be dispersedly disposed between the first touch sensing cells 411 so as not to overlap the first touch sensing cells 411 .
  • first touch sensing cells 411 and the second touch sensing cells 421 have a polygonal shape is illustrated in FIG. 3 , the first touch sensing cells 411 and the second touch sensing cells ( 421) can be variously changed.
  • the shapes of the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk are not limited thereto, and may be variously changed.
  • the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk may include a conductive material.
  • it may include a metal or an alloy thereof.
  • the metal include gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and platinum. (Pt) etc. are mentioned.
  • the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk may be formed of a transparent conductive material.
  • the transparent conductive material include silver nanowires (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), antimony zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), and SnO 2 (Tin Oxide), carbon nanotubes (Carbon Nano Tube), graphene (graphene), and the like.
  • Each of the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk may be formed of a single layer or a multilayer.
  • the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk may be made of the same material or different materials.
  • the driving electrodes Tx1 to Txj and the sensing electrodes Rx1 to Rxk may be disposed on a substrate (not shown).
  • a substrate may be implemented as a separate substrate or may be implemented as various components included in the display device.
  • the substrate may be an encapsulation layer of the display panel 210 .
  • the touch sensor 100 may be designed in an on-cell method.
  • the touch sensing unit 110 may be disposed above the display panel 210 .
  • the touch driving unit 121 may supply a touch driving signal Td to the touch sensing unit 110 to drive the touch sensor 100 .
  • the touch driving unit 121 may sequentially supply the touch driving signal Td from the first driving electrode Tx1 to the j-th driving electrode Txj.
  • the present invention is not limited thereto, and the touch driving unit 121 may time-divisionally supply the touch driving signal Td according to a different order, and may also supply the touch driving signal Td to the plurality of driving electrodes according to the characteristics of the touch driving signal Td.
  • a simultaneous supply method can also be used.
  • the spatial distance between the touch sensing unit 110 and the display panel 210 has been reduced in order to achieve a trend toward miniaturization and thinning of the display device and to implement flexible characteristics, and accordingly, the touch sensing unit 110 and the display panel.
  • the effect of the parasitic capacitance (Cp) existing between (210) is also increased.
  • the parasitic capacitance Cp mainly exists between the touch electrode included in the touch sensing unit 110 and the power supply surface 211 included in the display panel 210 , and the power supply surface 211 has a voltage according to pixel operation. Since an IR drop occurs, display noise through the power supply surface 211 is induced in the touch sensing unit 110 , so that a desired touch sensing sensitivity cannot be obtained.
  • each row sharing the driving time of the driving electrodes Tx1 to Txj is affected by the same display noise, but a mismatch of the panel and the receiving end
  • the influence of the display noise for each row due to mismatch of (sensing electrodes) has a gentle slope change.
  • the influence of the display noise increases as the screen change increases, so it is necessary to properly remove the noise of the corresponding display by tracking the change in the inclination.
  • the present invention intends to utilize the noise calculator 122 and the touch calculator 123 .
  • the noise calculating unit 122 may calculate noise data for each row of the sensing node having the commonality of display noise using the sensing data output from the touch sensing unit 110 , and the touch calculating unit 123 may When the noise calculation unit 122 completes the calculation of the noise data for each row, touch data may be calculated by subtracting the calculated total noise data from the sensing data corresponding thereto.
  • the noise calculating unit 122 calculates the noise of each sensing node included in the m (1 ⁇ m ⁇ j)-th row.
  • Data is set as the sensing data received from the touch sensing unit 110, and when it is determined that a touch event has occurred in the nth sensing node included in the mth row, noise data of the nth sensing node is included in the mth row It can be updated as a value obtained by adding the tracking change amount to the noise data of the n-1th sensing node.
  • the noise calculator 122 determines that a touch event has occurred at the nth sensing node when the sum of the tracking change amount to the difference in sensing data between the nth sensing node and the n ⁇ 1st sensing node is greater than a preset threshold value. can do.
  • the tracking change amount may be set as an average value of the difference between sensing data and the previous sensing node for at least one sensing node located before the n-th sensing node in order to accurately track the change in display noise for each row of the sensing node.
  • the tracking change amount may be set as an average value of the difference between sensing data and the previous sensing node for each sensing node included in the m-th row.
  • the noise calculator 122 may sense the n ⁇ 1th sensing node together with the n ⁇ th sensing node. It can be determined that a touch event has occurred in the node and the n+1th sensing node.
  • a display noise component for each row of the sensing node can be effectively calculated, and a touch map including effective touch data as shown in FIG. 5 can be calculated by subtracting the calculated display noise component from the sensing data.
  • the touch calculator 123 may determine the location and intensity of a touch event on the touch sensor by performing a predetermined logical operation based on the calculated touch data.
  • FIG. 6 is a diagram illustrating a method of driving a touch sensor according to an embodiment of the present invention
  • FIGS. 7A to 7F are diagrams for explaining a method of driving the touch sensor shown in FIG. 6 .
  • FIG. 6 has described a method of driving the touch sensor for one frame period.
  • the touch sensing unit 110 includes a plurality of sensing nodes composed of 5 rows and 5 columns. is illustrated as an example.
  • sensing data for each sensing node is obtained from the touch sensing unit 110 including a plurality of sensing nodes consisting of j (j is an integer greater than or equal to 2) rows and k (k is an integer greater than or equal to 2) columns.
  • step ST100 may be performed. This step ST100 may be performed by the above-described noise calculator 122 .
  • the touch sensing unit 110 may include a total of 25 sensing nodes composed of 5 rows and 5 columns, and through this, the noise calculating unit 122 may each Sensing data S11 to S55 for each sensing node may be acquired (refer to FIG. 7A ).
  • a step ST110 of grouping the acquired sensing data S11 to S55 for each sensing node by row may be performed.
  • This step ST110 may be performed by the noise calculator 122 described above.
  • grouping may be performed on the obtained sensing data (S11 to S55) for each sensing node based on each row having a common display noise (see FIG. 7B ).
  • a step ST120 of setting (initializing) the noise data N11 to N55 of each sensing node as the sensing data S11 to S55 for each sensing node obtained from the touch sensing unit 110 may be performed.
  • This step ST120 may be performed by the above-described noise calculator 122 .
  • the noise data N11 to N55 of the sensing nodes included in each grouped row may be set to the same value as the sensing data S11 to S55 for each sensing node corresponding thereto (see FIG. 7C ). Accordingly, noise data of each sensing node included in the m (1 ⁇ m ⁇ j)-th row may be set as sensing data received from the touch sensing unit 110 .
  • the step of updating the noise data for each group (G1 to G5) of the sensing nodes may be performed.
  • This step may be performed by the noise calculator 122 described above, and when it is determined that a touch event has occurred in the n (2 ⁇ n ⁇ k)-th sensing node included in the m-th row, the touch event is generated.
  • the noise data of the nth sensing node may be updated as a value obtained by adding the tracking change amount to the noise data of the n ⁇ 1th sensing node included in the mth row. For example, a method of updating noise data for the first group G1 located in the first row will be described.
  • the step ST130 of calculating the tracking change amount of the first group G1 may be performed.
  • the tracking change amount may be set as an average value of the difference (D11 to D14) of sensing data from the previous sensing node for each sensing node included in the first row (refer to FIG. 7D ). That is, the initial tracking change amount of the first group G1 may be set as an average change amount of sensing data calculated for all sensing nodes.
  • the sensing data difference D1n-1 between the n-th sensing node and the n-1 sensing node is equal to the sensing data S1n of the n-th sensing node and n It may be set as a difference value between the sensing data S1n-1 of the -1th sensing node.
  • a step ST140 of determining whether a touch event has occurred in the nth sensing node included in the first group G1 may be performed.
  • This step ST140 may be performed by the above-described noise calculator 122 .
  • the noise calculator 122 is configured to calculate the n-th sensing node included in the m-th row when the sum of the tracking change amount to the difference between the sensing data of the n-th sensing node and the n-th sensing node is greater than a preset threshold, the n-th sensing node. It may be determined that a touch event has occurred in the sensing node. That is, when the following equation is satisfied, it can be determined that the touch event has occurred in the nth sensing node.
  • Smn is the sensing data of the n-th sensing node included in the m-th row
  • Smn-1 is the sensing data of the n-1 sensing node included in the m-th row
  • Vt is the tracking change amount
  • REF is a preset threshold.
  • the touch event has occurred when the following equation is satisfied, otherwise it is determined that the touch event has not occurred. have.
  • the noise data N12 of the second sensing node may be maintained without being updated (Fig. 7e), and thereafter, the step of updating the tracking variation (ST150) may be performed.
  • This step ST150 may be performed through the noise calculator 122 described above, and may be omitted if necessary.
  • the tracking change amount is set as the difference in sensing data between the nth sensing node and the previous sensing node, or The value obtained by averaging the difference in sensing data from the previously located specific sensing node to the n-th sensing node with the previous sensing node for each sensing node may be updated.
  • the tracking change is the difference between the sensing data of the second sensing node and the first sensing node ( D11) can be updated.
  • a step ST170 of determining whether the touch determination operation for the current group G1 is completed may be performed. Since the remaining sensing nodes still remain in the first group G1, the step of determining whether to touch the third sensing node (ST140) may be performed.
  • the noise data N13 of the third sensing node may be maintained without being updated.
  • the tracking variation may be updated as an average value of the difference D12 between the sensing data between the third sensing node and the second sensing node and the difference between the sensing data D11 between the second sensing node and the first sensing node.
  • the noise data N14 of the fourth sensing node may be maintained without being updated.
  • the tracking change amount is the difference between the sensing data of the 4th sensing node and the 3rd sensing node (D13), the sensing data difference between the 3rd sensing node and the 2nd sensing node (D12), and the difference between the 2nd sensing node and the 1st sensing node.
  • the average value of the sensing data difference D11 may be updated.
  • the noise data of the n-th sensing node is traced to the noise data of the n-1st sensing node included in the m-th row It can be updated with the sum of the changes.
  • the noise data N15 of the fifth sensing node is the noise data of the fourth sensing node ( It may be updated to a value (N15') obtained by adding the current tracking change amount to N14).
  • a step (ST180) of checking whether noise data of all groups has been acquired may be performed. Accordingly, each step ( S130 , ST140 , ST150 , ST160 , ST170 , ST180 ) for the remaining groups G2 to G5 may be repeatedly performed, and as noise data of all groups is acquired, finally as shown in FIG. 7f Total noise data can be calculated.
  • step ST190 the step of calculating the touch data by subtracting the calculated total noise data N11 to N55' from the corresponding sensing data (ST190) may proceed.
  • This step ST190 may be performed by the above-described touch calculator 123 .
  • the step of updating the amount of tracking variation (ST150) described above may be omitted in order to minimize the load on hardware.
  • the tracking variation average variation of sensing data calculated for all sensing nodes
  • the tracking variation initially calculated for each row in the tracking variation calculation step ST130 may be maintained and used.
  • FIG. 8 is a diagram illustrating a method of driving a touch sensor according to another embodiment of the present invention
  • FIGS. 9A to 9F are diagrams for explaining a method of driving the touch sensor illustrated in FIG. 8 .
  • FIG. 8 has described a method of driving the touch sensor for one frame period
  • FIG. 9A for convenience of explanation, the touch sensing unit 110 includes a plurality of sensing nodes composed of 5 rows and 5 columns. is illustrated as an example.
  • sensing data for each sensing node is obtained from the touch sensing unit 110 including a plurality of sensing nodes consisting of j (j is an integer greater than or equal to 2) rows and k (k is an integer greater than or equal to 2) columns.
  • step ST200 may be performed. This step ST200 may be performed by the noise calculator 122 described above.
  • the touch sensing unit 110 may include a total of 25 sensing nodes composed of 5 rows and 5 columns, and through this, the noise calculating unit 122 may each Sensing data S11 to S55 for each sensing node may be acquired (refer to FIG. 9A ).
  • a step ST210 of grouping the acquired sensing data S11 to S55 for each sensing node by row may be performed.
  • This step ST210 may be performed by the noise calculator 122 described above.
  • grouping may be performed on the obtained sensing data (S11 to S55) for each sensing node based on each row having a common display noise (refer to FIG. 9B ).
  • a step ST220 of setting (initializing) the noise data N11 to N55 of each sensing node as the sensing data S11 to S55 for each sensing node obtained from the touch sensing unit 110 may be performed.
  • This step ST220 may be performed by the above-described noise calculator 122 .
  • the noise data N11 to N55 of the sensing nodes included in each grouped row may be set to the same value as the sensing data S11 to S55 for each sensing node corresponding thereto (refer to FIG. 9C ). Accordingly, noise data of each sensing node included in the m (1 ⁇ m ⁇ j)-th row may be set as sensing data received from the touch sensing unit 110 .
  • the step of updating the noise data for each group (G1 to G5) of the sensing nodes may be performed.
  • This step may be performed by the noise calculator 122 described above, and when it is determined that a touch event has occurred in the n (2 ⁇ n ⁇ k)-th sensing node included in the m-th row, the touch event is generated.
  • the noise data of the nth sensing node may be updated as a value obtained by adding the tracking change amount to the noise data of the n ⁇ 1th sensing node included in the mth row. For example, a method of updating noise data for the first group G1 located in the first row will be described.
  • the tracking change amount may be set as an average value of the difference (D11 to D14) of sensing data with the previous sensing node for each sensing node included in the first row (refer to FIG. 9D ). That is, the initial tracking change amount of the first group G1 may be set as an average change amount of sensing data calculated for all sensing nodes.
  • the sensing data difference D1n-1 between the n-th sensing node and the n-1 sensing node is equal to the sensing data S1n of the n-th sensing node and n It may be set as a difference value between the sensing data S1n-1 of the -1th sensing node.
  • a step ST240 of determining whether a touch event has occurred in the n-th sensing node included in the first group G1 may be performed.
  • This step ST240 may be performed by the noise calculator 122 described above.
  • the noise calculator 122 is configured to calculate the n-th sensing node included in the m-th row when the sum of the tracking change amount to the difference between the sensing data of the n-th sensing node and the n-th sensing node is greater than a preset threshold, the n-th sensing node. It may be determined that a touch event has occurred in the sensing node. That is, when the following equation is satisfied, it can be determined that the touch event has occurred in the nth sensing node.
  • Smn is the sensing data of the n-th sensing node included in the m-th row
  • Smn-1 is the sensing data of the n-1 sensing node included in the m-th row
  • Vt is the tracking change amount
  • REF is a preset threshold.
  • the touch event has occurred when the following equation is satisfied, otherwise it is determined that the touch event has not occurred. have.
  • an update step ST250 of the tracking change may be performed. This step ST250 may be performed through the noise calculator 122 described above, and may be omitted if necessary.
  • the tracking change amount is set as the difference in sensing data between the nth sensing node and the previous sensing node, or The value obtained by averaging the difference in sensing data from the previously located specific sensing node to the n-th sensing node with the previous sensing node for each sensing node may be updated.
  • the tracking change amount of the second sensing node is determined by the second sensing node and the first sensing node. may be updated with the sensing data difference D11 of .
  • a step ST280 of determining whether a touch determination operation for the current group G1 is completed may be performed. Since the remaining sensing nodes still remain in the first group G1, the step of determining whether to touch the third sensing node (ST240) may be performed.
  • the updating step ST250 of the tracking change may be performed. Accordingly, the tracking change amount of the third sensing node is the average value of the sensing data difference (D12) between the third sensing node and the second sensing node and the sensing data difference (D11) between the second sensing node and the first sensing node. Can be updated. have.
  • the number of sensing data difference values used in calculating the tracking variation is excessively large, the burden on hardware increases. In order to alleviate this, the number of sensing data difference values used in calculating the tracking variation may be appropriately adjusted.
  • the step of setting the touch area may be performed.
  • This step ST260 may be performed through the noise calculator 122 described above. For example, when it is determined that a touch event has occurred in the n-th sensing node included in the m-th row, n- adjacent to the n-th sensing node. It may be determined that a touch event has occurred in the first sensing node and the n+1th sensing node.
  • this step (ST260) when it is determined that the touch event has occurred in the n-th sensing node included in the m-th row, the n-1 th sensing node, the n th sensing node, and the n+1 th sensing node are selected as the touch event. It can be set as a touch area.
  • the third sensing node, the fourth sensing node, and the fifth sensing node may be set as a touch region in which a touch event occurs.
  • the third sensing node even if it is determined that the touch event has not occurred in the previous step, since it is located adjacent to the fourth sensing node recognized as the touch area, it may be set as the touch area.
  • the fifth sensing node even if it is determined that the touch event does not occur in a later step, since it is located adjacent to the fourth sensing node recognized as the touch area, it may be set as the touch area.
  • step ST270 of maintaining the same tracking change amount as the previous tracking change amount without updating the tracking change amount may be performed.
  • This step ST270 may be performed through the noise calculator 122 described above.
  • the tracking change amount maintenance step S270 may be performed.
  • the step of checking the touch area may be performed.
  • step ST290 it may be determined whether each sensing node included in the first group G1 has been set as a touch area in the previous step. Thereafter, the step of updating noise data ( ST300 ) may be performed for the sensing node determined as the touch area.
  • noise data of the n-th sensing node is combined with noise data of the n-th sensing node included in the m-th row It can be updated with the sum of the tracking change amount.
  • the noise data N13 of the third sensing node set as the touch area in the previous step may be updated to a value N13' that is the sum of the tracking change amount to the noise data N12 of the second sensing node, and the fourth sensing
  • the noise data N14 of the node may be updated as a value (N14') obtained by adding the tracking change amount to the noise data N13 of the 3rd sensing node, and the noise data N15 of the 5th sensing node is the 4th sensing node. It may be updated as a value (N15') obtained by adding the tracking change amount to the noise data (N14) of .
  • existing noise data may be maintained for a sensing node that is not set as a touch area.
  • a step ST310 of determining whether the touch area check for the current group G1 is completed may be performed, and when the touch area check for the corresponding group is completed, all groups
  • a step ST320 of checking whether noise data is acquired may be performed. Accordingly, each step (S230, ST240, ST250, ST260, ST270, ST280, ST290, ST300, ST310) for the remaining groups G2 to G5 may be repeatedly performed, and as noise data of all groups is acquired Finally, total noise data as shown in FIG. 9F may be calculated.
  • a step ST330 of calculating the touch data by subtracting the calculated total noise data N11 to N55' from the corresponding sensing data may proceed (ST330).
  • This step ST330 may be performed by the above-described touch calculator 123 .
  • the step of updating the tracking variation ( ST250 ) and the step of maintaining the tracking variation ( S270 ) described above may be omitted in order to minimize the load on hardware.
  • the tracking variation average variation of sensing data calculated for all sensing nodes
  • the tracking variation initially calculated for each row in the tracking variation calculating step ST230 may be maintained and used.

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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

La présente invention peut fournir un capteur tactile comprenant : une unité de détection tactile comprenant de multiples nœuds de détection agencés en j rangées ; une unité de calcul de bruit pour calculer des données de bruit pour chaque rangée des nœuds de détection en utilisant des données de détection délivrées par l'unité de détection tactile ; et une unité de calcul de toucher pour déduire des données de bruit total calculées à partir de données de détection correspondant à celles-ci de sorte à calculer des données tactiles lorsque les données de bruit pour chaque rangée ont été calculées par l'unité de calcul de bruit, l'unité de calcul de bruit configurant des données de bruit de chacun des nœuds de détection inclus dans une mième (1 ≤ m ≤ j) rangée en tant que données de détection reçues de l'unité de détection tactile, et, lorsqu'il est déterminé qu'un événement tactile s'est produit dans un nième nœud de détection inclus dans la mième rangée, des données de bruit du nième nœud de détection sont mises à jour avec une valeur obtenue par ajout de données de bruit d'un (n-1)ième nœud de détection inclus dans la mième rangée à une variance de suivi.
PCT/KR2020/003507 2020-02-28 2020-03-13 Capteur tactile et son procédé de commande WO2021172645A1 (fr)

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CN113986046B (zh) * 2021-11-12 2024-04-05 北京集创北方科技股份有限公司 触摸检测的报点方法及装置、电子设备

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