WO2015119462A1 - Procédé pour obtenir des informations d'entrée tactile d'une électrode de détection particulière par connexion ensemble d'une pluralité d'électrodes de détection indépendantes - Google Patents

Procédé pour obtenir des informations d'entrée tactile d'une électrode de détection particulière par connexion ensemble d'une pluralité d'électrodes de détection indépendantes Download PDF

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Publication number
WO2015119462A1
WO2015119462A1 PCT/KR2015/001260 KR2015001260W WO2015119462A1 WO 2015119462 A1 WO2015119462 A1 WO 2015119462A1 KR 2015001260 W KR2015001260 W KR 2015001260W WO 2015119462 A1 WO2015119462 A1 WO 2015119462A1
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WIPO (PCT)
Prior art keywords
sensing
sensing electrodes
touch
electrodes
touch input
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PCT/KR2015/001260
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English (en)
Korean (ko)
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신형철
윤일현
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주식회사 센트론
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Publication of WO2015119462A1 publication Critical patent/WO2015119462A1/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
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • 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
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving

Definitions

  • the present invention relates to a technique for acquiring touch input information on a specific sensing electrode in a self-capacitance touch input sensing device.
  • user devices called smart phones, smart pads, and laptop computers have been disclosed.
  • these user devices may include a device that is arranged near a display screen of the user device and covers an entire area of the display screen as a user input device that receives a user command.
  • user input devices include so-called pressure sensitive touch panels, capacitive touch panels, and stylus pen touch panels (hereinafter, simply pen touch panels).
  • touch input technologies are products based on different technologies (hereinafter, touch input technologies). Since the above technologies have their own advantages and disadvantages, attempts have been made to provide a more convenient user input experience by combining the advantages of each other. The basic principle of operation of each of these techniques has been disclosed in several documents.
  • the present invention is to provide a method for increasing the SNR of the touch input sensing field.
  • a second step of obtaining a second output value y [1] from the circuit; And calculating information about a touch input with respect to any one of the M ( 4) sensing electrodes by using the first output value y [0] and the second output value y [1].
  • a third step is included.
  • a method of calculating touch input information comprising: first information including definitions for p time periods T_v; Each of the plurality of p time periods T_v is defined in correspondence with the second information including a definition of a sensing electrode combination TEC_v consisting of N_v sensing electrodes selected from the plurality of sensing electrodes.
  • different sensing electrode combinations belonging to the p sensing electrode combinations may include sensing electrodes of different combinations.
  • the method includes connecting all sensing electrodes belonging to the sensing electrode combination TEC_v together during the time period T_v to an input terminal of an arbitrary touch sensing circuit to obtain an output value TO_v from the arbitrary touch sensing circuit; And calculating information about a touch input to any one of the plurality of sensing electrodes using the p output values TO_v.
  • the plurality of sensing electrodes may be arranged in a matrix form.
  • the plurality of sensing electrodes may be provided separately from the display panel and disposed on the display panel.
  • the display panel may be any one of a TFT panel and an IPS panel.
  • the plurality of sensing electrodes may be a plurality of separate common electrodes used as components of the display panel to operate the display panel.
  • the plurality of sensing electrodes may be connected to input terminals of one or more touch input sensing circuits allocated in a predetermined manner during the p time periods T_v.
  • the plurality of sensing electrodes may be connected to a predetermined reference potential Vref2 during at least some of the periods other than the p time periods T_v.
  • the plurality of sensing electrodes may be adjacent to each other.
  • N_v may be a constant regardless of the v value.
  • the first sensing electrode of the plurality of sensing electrodes is not adjacent to any of the sensing electrodes except for the first sensing electrode of the plurality of sensing electrodes, and all of the sensing electrodes are adjacent to the first sensing electrode.
  • the sensing electrode may not be included in the plurality of sensing electrodes.
  • the touch sensing circuit TSC_a and the touch sensing circuit TSC_b are It may be the same touch detection circuit.
  • a and b are different values, and a and b each represent an integer of 1 to p.
  • the touch sensing circuit TSC_a and the touch sensing circuit TSC_b are It may be different touch sensing circuits. Provided that a and b are different values, and a and b each represent an integer of 1 to p.
  • Touch input sensing device a plurality of sensing electrodes; One or more touch sensing circuits; And a processing unit.
  • the processing unit may include: first information including definitions of p time periods T_v; Each of the plurality of p time periods T_v is defined in correspondence with the second information including a definition of a sensing electrode combination TEC_v consisting of N_v sensing electrodes selected from the plurality of sensing electrodes. A method of calculating information about a touch input to one of the sensing electrodes is performed.
  • different sensing electrode combinations belonging to the p sensing electrode combinations may include sensing electrodes of different combinations.
  • the processor is configured to connect all the sensing electrodes belonging to the sensing electrode combination TEC_v to the input terminal of an arbitrary touch sensing circuit together during the time period T_v to obtain an output value TO_v from the arbitrary touch sensing circuit. ; And calculating information on a touch input to any one of the plurality of sensing electrodes by using the p output values TO_v.
  • the present invention it is possible to provide a method of increasing the SNR by increasing the time for the touch input sensing device to receive an input signal from one sensing electrode.
  • FIG. 1 illustrates a cross-sectional structure of an input / output panel constituting an integrated input / output device in which a touch input device and a display device are combined according to an embodiment of the present invention.
  • FIG. 2 illustrates a structure of an integrated input / output device according to an embodiment of the present invention.
  • FIG. 3 shows in more detail the configuration near the four VCOM electrodes A1, B1, C1, D1 in the upper left of FIG.
  • FIG. 4A shows the structure near the image pixel N11 shown in FIG. 3 in more detail.
  • FIG. 4B shows the structure near VCOM, 11 shown in FIG. 3 in more detail.
  • 5A is a diagram illustrating a configuration of a circuit for detecting whether a touch input is made at a specific common electrode VCOM, xx and an operation principle thereof according to an embodiment of the present invention.
  • FIG. 5B shows an example in which the waveform of the periodic voltage signal Vdp shown in FIG. 5A is provided in the form of a periodic AC waveform without a DC component.
  • 5C illustrates a circuit structure in accordance with one embodiment of the present invention for removing the effects of parasitic capacitance in the circuit of FIG. 4B.
  • FIG. 6A illustrates a configuration of a touch input sensing circuit provided according to an embodiment of the present invention.
  • FIG. 6B illustrates a connection relationship between another multiplexer 555 or a switch 555 not shown in FIG. 6A.
  • FIG. 7A is an example of an internal structure illustrating the functions of the MUXs shown in FIG. 6A.
  • FIG. 7B is another example of an internal structure showing the functions of the MUXs shown in FIG. 6A.
  • FIG. 8A is a timing diagram illustrating a method of driving a touch input sensing circuit according to FIG. 6A, according to an exemplary embodiment.
  • FIG. 8B is a modification of the method of driving the touch input sensing circuit according to FIG. 8A.
  • FIG. 8C is a modification of the method of driving the touch input sensing circuit according to FIG. 8A.
  • FIG. 8D is a modification of the method of driving the touch input sensing circuit according to FIG. 8C.
  • FIG. 9A is a timing diagram illustrating a method of operating the touch input sensing circuit according to FIG. 2 during a touch input sensing wait time according to an embodiment of the present invention.
  • FIG. 9B illustrates an example in which the MUX M1 of FIG. 6A connects VCOM, 11, VCOM, 12, VCOM, 21, VCOM, and 22 to the touch sensing signal output unit 10 at one time.
  • FIG. 10 is a diagram for describing a method of detecting whether a touch input event occurs in a specific VCOM electrode according to another exemplary embodiment of the present invention.
  • FIG. 1 illustrates a cross-sectional structure of an input / output panel constituting an integrated input / output device in which a touch input device and a display device are combined according to an embodiment of the present invention.
  • the input / output panel 1050 includes a liquid crystal display panel having a thin film transistor array substrate 1020, a color filter array substrate 1030, a liquid crystal layer 1040 filled between the two substrates 1020 and 1030, and a thin film transistor array substrate ( It may include a backlight unit (BLU) 1060 formed under the 1020.
  • BLU backlight unit
  • the thin film transistor array substrate 1020 may include gate lines and data lines formed to cross each other on the first substrate 1021, thin film transistors formed at intersections of the gate lines and the data lines, and formed in a liquid crystal cell unit. And a TFT array 1023 including pixel electrodes connected to thin film transistors, and an alignment film 1025 coated thereon.
  • the gate lines and the data lines receive a signal from the driving circuits through the respective pad parts, and the thin film transistor may supply a pixel voltage signal supplied to the data line to the pixel electrode in response to a scan signal supplied to the gate line.
  • the color filter array substrate 1030 includes color filters 1033 formed in units of liquid crystal cells on the second substrate 1031, a black matrix 1035 for distinguishing between color filters and reflecting external light, and liquid crystal cells. It may include a common electrode (Vcom) 1037 for supplying a reference voltage to the common, and an alignment film 1039 coated on them.
  • the common electrode (Vcom) 1037 may be divided into a number provided. That is, a plurality of common electrodes may exist.
  • the plurality of common electrodes may be used as a device for detecting a touch input.
  • FIG. 2 illustrates a structure of an integrated input / output device according to an embodiment of the present invention.
  • the integrated input / output device may include an input / output panel 1050, a timing controller 1101, a data driver 1102, a gate driver 1103, a host computer 1120, and a touch IC.
  • a timing controller 1101 for convenience, only the first substrate 1021 and the plurality of common electrodes Vcom 1037 in which the gate lines and the data lines are formed in the input / output panel 1050 are illustrated.
  • the input / output panel 1050 may include a color filter array, a thin film transistor array, a liquid crystal layer disposed therebetween, and a spacer for maintaining a cell gap of the liquid crystal layer.
  • the color filter array may include an upper substrate, a color filter formed on one surface of the upper substrate, a black matrix, and a common electrode Vcom formed on the color filter and the black matrix.
  • the thin film transistor array includes a lower substrate and a plurality of data lines (DL) 1104, a plurality of gate lines (GL) 1105, gate lines 1105, and a plurality of data lines (DL) 1104 formed to cross each other on one surface of the lower substrate.
  • the thin film transistor may be formed in an area where the data line 1104 intersects, and pixels defined by the intersection of the gate line 1105 and the data line 1104.
  • the lower polarizer may be disposed on the other surface of the lower substrate.
  • the backlight unit may be disposed under the input / output panel 1050.
  • the backlight unit may uniformly irradiate light to the input / output panel 1050 including a plurality of light sources.
  • the backlight unit may be implemented as a direct type backlight unit or an edge type backlight unit.
  • the light source of the backlight unit may include any one or two or more light sources of a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode (LED).
  • HCFL hot cathode fluorescent lamp
  • CCFL cold cathode fluorescent lamp
  • EEFL external electrode fluorescent lamp
  • LED light emitting diode
  • the data driver 1102 may sample and latch the digital video data RGB under the control of the timing controller 1101.
  • the data driver 1102 may convert the digital video data RGB into a positive / negative gamma compensation voltage to reverse the polarity of the data voltage.
  • the positive / negative data voltage output from the data driver 1102 may be synchronized with the gate pulse output from the gate driver 1103.
  • Each of the source drive ICs of the data driver 1102 may be connected to the data lines 1104 of the input / output panel 1050 by a chip on glass (COG) process or a tape automated bonding (TAB) process.
  • the source drive IC may be integrated in the timing controller 1101 and implemented as a one-chip IC together with the timing controller 1101.
  • the gate driver 1103 sequentially outputs a gate pulse (or scan pulse) in the display mode under the control of the timing controller 1101, and shifts the swing voltage of the output to a gate high voltage and a gate low voltage.
  • the gate pulses output from the gate driver 1103 may be sequentially supplied to the gate lines 1105 in synchronization with the data voltages output from the data driver 1102.
  • the gate high voltage may be a voltage higher than or equal to the threshold voltage of the thin film transistor T, and the gate low voltage may be lower than the threshold voltage of the thin film transistor T.
  • the gate drive ICs of the gate driver 1103 may be connected to the gate lines 1105 of the lower substrate of the input / output panel 1050 through a TAP process, or may be connected to the gate lines 1105 of the input / output panel 1050 together with pixels through a GIP (Gate In Panel) process. It may be formed directly on the lower substrate.
  • GIP Gate In Panel
  • the timing controller 1101 uses a timing signal from the host computer 1120 to adjust the data timing control signal for controlling the operation timing of the data driver 1102 and the polarity of the data voltage, and the operation timing of the gate driver 1103.
  • a gate timing control signal for controlling may be generated.
  • the gate timing control signal may include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (Gate Output Enable, GOE), and the like.
  • the gate start pulse GSP is applied from the gate driver 1103 to the first gate drive IC that outputs the gate pulse first in every frame period to control the shift start timing of the gate drive IC.
  • the gate shift clock GSC is commonly input to gate drive ICs of the gate driver 1103 to shift the gate start pulse GSP.
  • the gate output enable signal GOE may control the output timing of the gate drive ICs of the gate driver 1103.
  • the data timing control signal includes a source start pulse (SSP), a source sampling clock (SSC), a polarity control signal (POL), and a source output enable signal (SOE). It may include.
  • the source start pulse SSP may be applied to the first source drive IC sampling data first in the data driver 1102 to control the data sampling start timing.
  • the source sampling clock SSC is a clock signal that controls sampling timing of data in the source drive ICs based on a rising or falling edge.
  • the polarity control signal POL may control the polarity of the data voltages output from the source drive ICs.
  • the source output enable signal SOE can control the output timing of the source drive ICs. If the digital video data RGB is input to the data driver 1102 through a low voltage differential signaling (LVDS) interface, the source start pulse SSP and the source sampling clock SSC may be omitted.
  • LVDS low voltage differential signaling
  • the host computer 1120 transmits the digital video data RGB of the input image and the timing signals Vsync, Hsync, DE, and MCLK required for driving the display through an interface such as an LVDS interface and a transition minimized differential signaling (TMDS) interface. It may transmit to the timing controller 1101.
  • an interface such as an LVDS interface and a transition minimized differential signaling (TMDS) interface. It may transmit to the timing controller 1101.
  • TMDS transition minimized differential signaling
  • the timing controller 1101, the data driver 1102, and the gate driver 1103 may be included in one DDI chip 2 (FIG. 6A).
  • 6A illustrates an example in which the DDI chip 2 includes a timing controller 1101, a data driver 1102, and a gate driver 1103 for convenience of description.
  • the common electrode 1037 may be referred to as a 'VCOM electrode 1037'.
  • the common electrode 1037 intersecting in the p-th row and the q-th column may be referred to as VCOM, pq.
  • the common electrodes 1037 may be used as a component for outputting the screen in the first time period, and may be used as a component for checking the touch input in the second time period.
  • FIG. 3 shows in more detail the configuration near the four VCOM electrodes A1, B1, C1, D1 in the upper left of FIG.
  • the plurality of data lines DL1, DL2, DL3, ... extend in the up and down direction in the drawing, and the plurality of gate lines GL1, GL2, GL3, ... extend in the left and right direction in the drawing. have.
  • the image output from the image pixel can be controlled.
  • the image pixels existing at the intersection point are denoted by the symbol Nxy.
  • the image pixel at the node where the data line DL1 and the gate line GL1 intersect is denoted by N11.
  • FIG. 4A shows the structure near the image pixel N11 shown in FIG. 3 in more detail.
  • an electrical signal applied through the data line DL1 affects the transistor T11, where the gate line GL1 adjusts the gate voltage of the transistor T11.
  • the data line DL1, the gate line GL1, the transistor T11, and VCOM, 11 exist near the image pixel N11.
  • various capacitors 61 to 66 exist between these components. Some of these capacitors 61 to 66 are intentionally formed, and others may be inadvertently generated capacitors.
  • a total of six capacitors 61 to 66 are modeled, but may be modeled in different numbers. It will be described below on the basis of the six modeled examples.
  • the touch input sensing characteristic is determined by the capacitors 64, 65, 66 directly connected to VCOM, 11 and the capacitance ⁇ Cx, 11 formed between VCOM, 11 and the touch input tool 17. I can understand. At this point, in view of the touch input processing, the capacitors 61 to 66 may be regarded as the parasitic capacitor C11 as a whole.
  • the parasitic capacitor C11 may be regarded as a capacitor having nodes n11 to n12 as the first pole and nodes n21 to n24 as the second pole.
  • the parasitic capacitor C11 is connected to a total of three points of VCOM, 11, the data line DL1, and the gate line GL1.
  • one end of the parasitic capacitor C11 may be regarded as a portion connected to VCOM, 11 and the other terminal is a portion connected to the data line DL1 and the gate line GL1.
  • FIG. 4B shows the structure near VCOM, 11 shown in FIG. 3 in more detail.
  • 5A is a diagram illustrating a configuration of a circuit for detecting whether a touch input is made at a specific common electrode VCOM, xx and an operation principle thereof according to an embodiment of the present invention.
  • the touch input sensing circuit 10 shown in FIG. 5A may include an operational amplifier 215 and an integrating capacitor Cf connected between an inverting input terminal and an output terminal of the operational amplifier 215.
  • the voltage signal Vdp may be input to the non-inverting input terminal of the operational amplifier 215.
  • the input terminal 11 of the touch input sensing circuit 10 may be defined.
  • the input terminal 11 may be the same terminal as the inverting input terminal of the operational amplifier 215.
  • the input terminal 11 may be connected to VCOM, xx.
  • the voltage signal Vdp may be a signal having periodicity. Furthermore, it may be a periodic signal in which the DC component is zero, that is, an AC periodic signal. Alternatively, the voltage signal Vdp may not be a periodic signal, but may be a signal having a component of frequency fc.
  • the magnitude of the current flowing through the node Nx, xx is equivalent to the capacitance Cx, xx formed between the common electrode VCOM, xx and the finger 17 combined with the parasitic capacitance Cp, xx. It can be influenced by the size of the capacitance.
  • This equivalent capacitance can be named Cxe.
  • the parasitic capacitance Cp, xx represents a result of modeling all parasitic capacitances connected to the common electrode VCOM, xx as one capacitor.
  • the parasitic capacitance Cp, xx may be modeled by one capacitor of the influence of four parasitic capacitors C11, C12, C21, and C22.
  • a process of checking whether a touch input is made at the common electrode VCOM, xx may be periodically updated, and when the update is required, the switch SWr may be reset to an on state for a while. .
  • FIG. 5B shows an example in which the waveform of the periodic voltage signal Vdp shown in FIG. 5A is provided in the form of a periodic AC waveform without a DC component.
  • Fig. 5B shows an alternating sine wave
  • (b) shows an alternating triangle wave
  • (c) shows an alternating square wave.
  • the output voltage Vo of the operational amplifier 215 outputs waveforms of the same or similar form as the AC sine wave, the AC triangle wave, and the AC square wave.
  • the output voltage Vo may have a frequency component different from the center frequency fc, and the other frequency component may be (1) a frequency component inherent in the voltage signal Vdp, or (2) a voltage according to a nonlinear transfer function. It may be a frequency component generated by being distorted from the signal Vdp, or (3) may be a frequency component provided by noise introduced from the outside.
  • the amplitude of the output voltage Vo may be proportional to the magnitude of the equivalent capacitance Cxe described above and may be inversely proportional to the magnitude of the integration capacitor Cf. Therefore, since the magnitude of the integrating capacitor Cf is known in advance, the magnitude of the equivalent capacitance Cxe can be calculated by measuring the amplitude of the output voltage Vo. At this time, if the value of the parasitic capacitance Cp, xx can be known in advance, the value of the capacitance Cx, xx formed between the electrode pad VCOM, xx and the finger 17 can also be determined.
  • the amplitude of the output voltage Vo may be measured directly, but a specific sine wave is applied to the output voltage Vo. You can also mix to measure the output voltage. In this case, only the same frequency component as the sine wave among the components of the output voltage Vo may be extracted. As the sine wave, the same signal sin (2 ⁇ fc) as the center frequency fc of the voltage signal Vdp may be used. As a result, noises of frequency components other than the center frequency fc may be removed.
  • 5C illustrates a circuit structure in accordance with one embodiment of the present invention for removing the effects of parasitic capacitance in the circuit of FIG. 4B.
  • the voltage of the inverting input terminal (-) of the operational amplifier 215 is considered to be the same as the voltage of the non-inverting input terminal (+). Therefore, the voltage at one node Nx, 11 of the parasitic capacitance Cp, 11 connected to the inverting input terminal ( ⁇ ) and the same node Nx, 11 is the same as the voltage signal Vdp.
  • the other node n2 of the parasitic capacitance Cp and 11 may be connected to the data lines DL1 and DL2 and the gate lines GL1 and GL2.
  • the switches SW1-1, SW1-2, SW1-3, etc. may be provided so that the voltage signal Vdp may be provided to the data lines DL1 and DL2 and the gate lines GL1 and GL2 at least in a time period for detecting a touch input.
  • SW1-4 can be installed. In other time periods, the switches SW1-1, SW1-2, SW1-3, and SW1-4 supply signals for display to the data lines DL1 and DL2 and the gate lines GL1 and GL2, respectively.
  • the terminal b of the switch SW1-1 may be provided with a superimposed DC voltage DC1 to the voltage signal Vdp, and the terminal b of the switch SW1-2 may be provided.
  • the DC voltage DC2 may be superimposed on the voltage signal Vdp, and the terminal b of the switch SW1-3 may be provided by superimposing the DC voltage DC3 on the voltage signal Vdp.
  • the terminal b of the SW1-4 may be provided by superimposing a DC voltage DC4 to the voltage signal Vdp.
  • the DC voltage DC1, the DC voltage DC2, the DC voltage DC3, and the DC voltage DC4 may be different values, or may be all the same value, or may be all zeros. May have a value.
  • the DC voltage is added to the voltage signal Vdp provided to the terminals b of the switches SW1-1, SW1-2, SW1-3, and SW1-4, the voltage across the parasitic capacitance Cp, 11 does not change with time. Since there is no current flowing through the parasitic capacitance Cp, 11, it can operate as if the parasitic capacitance Cp, 11 does not exist.
  • the switch SW1 may be connected to VCOM 11.
  • VCOM By the switch SW1, VCOM, 11 can be in a floating state in the time period for detecting the touch input. In other time periods, not only VCOM and 11 but all VCOM electrodes may be connected to a predetermined reference potential Vref2.
  • reference numeral 10 may be referred to as a 'touch detection signal output unit'.
  • FIG. 6A illustrates a configuration of a touch input sensing circuit provided according to an embodiment of the present invention.
  • each common electrode 1037 shown in FIG. 6A corresponds to VCOM, 11 in FIG. 5C.
  • the MUXs M1 to M9 illustrated in FIG. 6A are disposed between VCOM 11 and the touch sensing signal output unit 10 of FIG. 5C.
  • the switch SW1, the data line, and the gate line illustrated in FIG. 5C are not illustrated for convenience.
  • each common electrode is electrically separated from each other, and each common electrode may be connected to the DDI chip 2 through a wiring 2037.
  • the DDI chip 2 may include a timing controller 1101, a data driver 1102, and a gate driver 1103 shown in FIG. 2.
  • the size of the gap between the common electrodes 1037 shown in FIG. 6A is exaggerated for convenience of explanation.
  • the DDI chip 2 may include one or more MUXs M1 to M9. Each MUX may select one or a plurality of sets of common electrodes including a plurality of common electrodes 1037 adjacent to each other and connect the MUX to the touch sensing signal output unit 10.
  • the MUX M1 selects one or a plurality of common electrodes A1, B1, C1, and D1 adjacent to each other.
  • the touch sensing signal output unit 10 is configured to output whether or not a touch input is made from the common electrode 1037 connected through the MUX. In addition, the touch detection signal output unit 10 is configured to output a value relating to the input intensity when a touch input is made.
  • the output values 1 of the plurality of touch sensing signal output units 10 may be provided to the touch IC 3.
  • the touch IC 3 may determine the touch coordinate by calculating which part of the plurality of common electrodes the touch input is made based on the output values 1.
  • the host computer 1120 may receive the touch coordinates from the touch IC 3 and execute an application corresponding to the touch coordinates.
  • FIG. 6B illustrates a connection relationship between another multiplexer 555 or a switch 555 not shown in FIG. 6A.
  • the common electrode 1037 is illustrated as being directly connected to the MUXs M1 to M9, but in practice, the common electrode 1037 may be connected to the MUXs M1 to M9 through another multiplexer or switch 555. Can be.
  • the multiplexer or switch 555 connects the common electrode 1037 to the MUXs M1 to M9 during the touch input sensing time period, and connects the common electrode 1037 to the reference potential Vref2 during the screen update time period. It may be intended to be connected.
  • FIG. 7A is an example of an internal structure illustrating the functions of the MUXs shown in FIG. 6A.
  • each MUX may select one of four inputs IN1 to IN4 to connect to the output OUT.
  • a 2-bit input selector (Sel-2bit) may be provided.
  • FIG. 7B is another example of an internal structure showing the functions of the MUXs shown in FIG. 6A.
  • each MUX may select one or more of four inputs IN1 to IN4 to connect to the output OUT.
  • two or more inputs can be connected to the output at the same time.
  • a 4-bit input selector (Sel-4bit) may be provided.
  • FIG. 8A is a timing diagram illustrating a method of driving a touch input sensing circuit according to FIG. 6A, according to an exemplary embodiment.
  • the screen output through the input / output panel 1050 is updated at a frequency of 60 Hz.
  • This 8.7 ms time period can be referred to as a screen update time period 53 below.
  • a time period of 8 ms which is the remaining period of the screen update period, may be referred to as a touch input detection time period 52.
  • the common electrodes are touched by separating the plurality of common electrodes from the circuit unit providing the predetermined potential and connecting the touch electrodes to the touch sensing signal output unit 10 through the MUX. It can be used as a device for sensing.
  • the signal TOUCH_EN may have a low value in the screen update time period 53 and have a high value in the touch input detection time period 52.
  • the touch input sensing time period 52 is each A-time period 52A, B-time period 52B, C-time period 52C, and D- having a duration of 2 ms. It can be divided into time period 52D.
  • the MUXs M1 to M9 select the common electrodes A1 to A9 belonging to the group A in the A-time section 52A, respectively, and belong to the group B in the B-time section 52B.
  • the common electrodes B1 to B9 are selected, the common electrodes C1 to C9 belonging to the group C are selected at the C-time interval 52C, and the groups are selected at the D-time interval 52D.
  • the common electrodes D1 to D9 belonging to D are selected.
  • FIG. 8B is a modification of the method of driving the touch input sensing circuit according to FIG. 8A.
  • the screen output through the input / output panel 1050 is updated at a frequency of 60 Hz.
  • the touch input sensing time interval 52 may be divided into the A-time period_1 152A, the B-time period_1 152B, and the C-time period_1 (which each have a duration of 1 ms).
  • 152C D-time interval _1 (152D), A-time interval _2 (252A), B-time interval _2 (252B), C-time interval _2 (252C), D-time interval _2 ( 252D).
  • the MUXs M1 to M9 select the common electrodes A1 to A9 belonging to the group A in the A-time interval _1 152A and the A-time interval _2 252A, respectively.
  • the common electrodes B1 to B9 belonging to the group B are selected, and the C-time period_1 (152C) and the C-time period are selected.
  • the common electrodes C1 to C9 belonging to the group C are selected, and in the D-time interval _1 152D and the D-time interval _2 252D, the common electrodes C1 to C9 are selected.
  • the common electrodes D1 to D9 belong to each other.
  • FIG. 8C is a modification of the method of driving the touch input sensing circuit according to FIG. 8A.
  • the screen output through the input / output panel 1050 is updated at a frequency of 120 Hz.
  • the touch input sensing time interval 52 is each A-time period 52A, B-time period 52B, C-time period 52C, and D- having a duration of 1 ms. It can be divided into time period 52D. 8C may operate in the same manner as that of FIG. 8A according to such a condition.
  • FIG. 8D is a modification of the method of driving the touch input sensing circuit according to FIG. 8C.
  • the screen output through the input / output panel 1050 is updated at a frequency of 120 Hz.
  • the screen update time period is composed of a first screen update time period 531 and a second screen update time period 532 spaced apart by a predetermined time therefrom.
  • the first screen update time period 531 and the second screen update time period 532 may each have a duration of 2.15 ms.
  • the touch input sensing time period may include a first touch input sensing time period 521 and a second touch input sensing time period 522 spaced apart by a predetermined time therefrom.
  • the first touch input sensing time period 521 and the second touch input sensing time period 522 may each have a duration of 2 ms.
  • the first touch input sensing time period 521 may be divided into an A-time period 52A and a B-time period 52B, each having a duration of 1 ms, and the second touch input sensing time.
  • the time period 522 may be divided into a C-time period 52C and a D-time period 52D, each having a duration of 1 ms.
  • the MUXs M1 to M9 select the common electrodes A1 to A9 belonging to the group A in the A-time section 52A, respectively, and belong to the group B in the B-time section 52B.
  • the common electrodes B1 to B9 are selected, the common electrodes C1 to C9 belonging to the group C are selected at the C-time interval 52C, and the groups are selected at the D-time interval 52D.
  • the common electrodes D1 to D9 belonging to D are selected.
  • the MUX may have a structure such as, for example, FIG. 7A or 7B.
  • 9A is a timing diagram illustrating an operation method of a touch input sensing circuit according to FIG. 2 during a touch input sensing waiting time according to one embodiment of the present invention.
  • the touch input may not be made for a long time.
  • the touch input is detected in the same manner as described with reference to FIGS. 8A to 8D, there is a problem in that standby power is used a lot. Therefore, when it is determined that the touch input has not been made for a long time, it may be switched to the touch input sensing standby mode as shown in FIG. 9A.
  • FIG 9A illustrates an example in which the screen output through the input / output panel 1050 is updated at a frequency of 60 Hz.
  • the MUXs of FIG. 6A may have a structure such as that of FIG. 7B.
  • the MUX M1 of FIG. 6A may connect VCOM, 11, VCOM, 12, VCOM, 21, VCOM, 22 to the touch sensing signal output unit 10 at once.
  • FIG. 10 is a diagram for describing a method of detecting whether a touch input event occurs in a specific VCOM electrode according to another exemplary embodiment of the present invention.
  • the MUXs of FIG. 6A may have a structure such as that of FIG. 7B.
  • the touch input sensing time interval 52 is each A-time period 52A, B-time period 52B, C-time period 52C, and D- having a duration of 2ms. It can be divided into time period 52D.
  • the MUX of FIG. 6A indicates that the VCOM electrodes (ex: VCOM, 11) belonging to the group A are touch sensed signals during the A-time period 52A, the B-time period 52B, and the C-time period 52C.
  • the VCOM electrodes (ex: VCOM, 12) belonging to the group B are touch-sensitive during the A-time period 52A, the B-time period 52B, and the D-time period 52D.
  • VCOM electrodes (ex: VCOM, 21) belonging to the group C during the A-time section 52A, C-time section 52C, D-time section 52D Connected to the sensing signal output unit 10, and the VCOM electrodes (ex: VCOM, 22) belonging to the group D are connected during the B-time period 52B, the C-time period 52C, and the D-time period 52D. It may be connected to the touch detection signal output unit 10.
  • a result of sampling the output voltage Vo of the touch sensing signal output unit 10 may be expressed as y [2].
  • the result of sampling the output voltage Vo of the touch sensing signal output unit 10 may be expressed as y [3].
  • y [0], y [1], y [2], and y [3] may be expressed as in the following equations.
  • A represents the output value of the touch sensing signal output unit 10 when only the VCOM electrodes (ex: VCOM, 11) belonging to group A are connected to the touch sensing signal output unit 10 alone through MUX.
  • B represents an output value of the touch sensing signal output unit 10 when only the VCOM electrode (ex: VCOM, 12) belonging to the group B is connected to the touch sensing signal output unit 10 alone through MUX.
  • C represents the output value of the touch sensing signal output unit 10 when only the VCOM electrode (ex: VCOM, 21) belonging to the group C is connected to the touch sensing signal output unit 10 alone through MUX.
  • D represents an output value of the touch sensing signal output unit 10 when only the VCOM electrode (ex: VCOM, 22) belonging to the group D is connected to the touch sensing signal output unit 10 alone through MUX.
  • S When the touch input sensing time period 52 ends, a value S obtained by adding y [0], y [1], y [2], and y [3] to each other can be obtained.
  • S has the following relationship with A, B, C, and D.
  • A, B, C, D can be obtained by the following formula.
  • S, y [0], y [1], y [2], and y [3] are all values that can be obtained by measuring using the touch sensing signal output unit 10.
  • Using the method according to FIG. 10 has an advantage that the SNR can be increased because the time measured for one specific VCOM increases, for example, compared to the method according to the embodiment described with reference to FIG. 8A.
  • the method includes: first information including definitions for p time periods T_v;
  • T_1 52A
  • T_2 52B
  • T_3 52C
  • T_4 52D
  • M 4
  • TEC_2 ⁇ A, B, D ⁇
  • TEC_3 ⁇ A, C, D ⁇
  • TEC_4 ⁇ B, C, D ⁇ .
  • the method includes connecting all the sensing electrodes belonging to the sensing electrode combination TEC_v together during the time period T_v to an input terminal of an arbitrary touch sensing circuit to obtain an output value TO_v from the arbitrary touch sensing circuit. Include.
  • all of the sensing electrodes A, B, and D belonging to the sensing electrode combination TEC_2 during the time period T_2 may be connected together to an input terminal of an arbitrary second touch sensing circuit 10.
  • all of the sensing electrodes A, C, and D belonging to the sensing electrode combination TEC_3 during the time period T_3 may be connected to an input terminal of an arbitrary third touch sensing circuit 10.
  • all of the sensing electrodes B, C, and D belonging to the sensing electrode combination TEC_4 may be connected together to an input terminal of an arbitrary fourth touch sensing circuit 10.
  • the method may include calculating information about a touch input to any one of the sensing electrodes using the p output values TO_v.
  • p 4 output values y [0], y [1], y [2], and y [3] are used to detect one of the sensing electrodes belonging to the plurality of sensing electrodes. Information on the touch input may be calculated.
  • the plurality of sensing electrodes may be arranged in a matrix form. Or it may be arranged in a zigzag in a honeycomb structure.
  • the plurality of sensing electrodes may be provided as separate modules separated from the display panel and disposed on the display panel.
  • the display panel may be any one of a TFT panel and an IPS panel, but is not limited to a specific type.
  • the plurality of sensing electrodes may be a plurality of separated common electrodes used as components of the display panel to operate the display panel.
  • All of the plurality of sensing electrodes may be connected to a predetermined reference potential Vref2 during at least some of the time periods other than the p time periods T_v.
  • the plurality of sensing electrodes may be adjacent to each other. That is, when a first sensing electrode is arbitrarily selected among the plurality of sensing electrodes, at least one sensing electrode of the sensing electrodes except for the first sensing electrode of the plurality of sensing electrodes may be adjacent to the first sensing electrode. Can be.
  • a minimum distance between a first sensing electrode of the plurality of sensing electrodes and a second sensing electrode of the plurality of sensing electrodes is referred to as a first minimum distance, and one other predetermined one of the sensing electrodes other than the plurality of sensing electrodes is determined.
  • the first minimum distance may be greater than the second minimum distance.
  • the first sensing electrode of the plurality of sensing electrodes may not be adjacent to any of the remaining sensing electrodes except for the first sensing electrode of the plurality of sensing electrodes. That is, all of the sensing electrodes adjacent to the first sensing electrode may not be included in the plurality of sensing electrodes.
  • the touch sensing circuit TSC_a and the touch sensing circuit TSC_b are It may be the same one touch sensing circuit, provided that a and b are different values, and a and b are integers of 1 to p, respectively.
  • the touch sensing circuit TSC_a and the touch sensing circuit TSC_b are It may be different touch sensing circuits, provided that a and b are different values, and a and b are integers of 1 to p, respectively.

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

Abstract

L'invention concerne un procédé de détection d'entrée tactile qui comprend : une première étape consistant à obtenir une première valeur de sortie à partir d'un circuit de détection par connexion de N1 électrodes de détection sélectionnées parmi M électrodes de détection à une borne d'entrée du circuit de détection pendant une première période de temps ; une deuxième étape consistant à obtenir une seconde valeur de sortie à partir du circuit de détection par connexion de N2 électrodes de détection sélectionnées parmi les M électrodes de détection à la borne d'entrée du circuit de détection pendant une seconde période de temps ; et une troisième étape consistant à générer des informations d'entrée tactile par rapport à une électrode de détection des M électrodes de détection à l'aide de la première valeur de sortie et de la seconde valeur de sortie.
PCT/KR2015/001260 2014-02-08 2015-02-06 Procédé pour obtenir des informations d'entrée tactile d'une électrode de détection particulière par connexion ensemble d'une pluralité d'électrodes de détection indépendantes WO2015119462A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110022074A (ko) * 2006-06-09 2011-03-04 애플 인크. 터치 스크린 액정 디스플레이
KR20120119419A (ko) * 2011-04-21 2012-10-31 주식회사 실리콘웍스 터치감지회로
US20130155003A1 (en) * 2011-12-14 2013-06-20 Samsung Electro-Mechanics Co., Ltd. Touch sensing apparatus and method thereof
KR20130136360A (ko) * 2012-06-04 2013-12-12 크루셜텍 (주) 노이즈 감소를 위한 터치 검출 방법 및 장치
US20130342498A1 (en) * 2012-06-21 2013-12-26 Lg Display Co., Ltd. Touch Panel and Image Display Device Including the Same

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Publication number Priority date Publication date Assignee Title
US8994673B2 (en) 2011-12-09 2015-03-31 Lg Display Co., Ltd. Display device with integrated touch screen having electrical connections provided in inactive regions of display panel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110022074A (ko) * 2006-06-09 2011-03-04 애플 인크. 터치 스크린 액정 디스플레이
KR20120119419A (ko) * 2011-04-21 2012-10-31 주식회사 실리콘웍스 터치감지회로
US20130155003A1 (en) * 2011-12-14 2013-06-20 Samsung Electro-Mechanics Co., Ltd. Touch sensing apparatus and method thereof
KR20130136360A (ko) * 2012-06-04 2013-12-12 크루셜텍 (주) 노이즈 감소를 위한 터치 검출 방법 및 장치
US20130342498A1 (en) * 2012-06-21 2013-12-26 Lg Display Co., Ltd. Touch Panel and Image Display Device Including the Same

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