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WO2013009117A2 - Dispositif de détection d'entrée utilisateur et dispositif électronique comprenant ledit dispositif de détection - Google Patents

Dispositif de détection d'entrée utilisateur et dispositif électronique comprenant ledit dispositif de détection Download PDF

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Publication number
WO2013009117A2
WO2013009117A2 PCT/KR2012/005550 KR2012005550W WO2013009117A2 WO 2013009117 A2 WO2013009117 A2 WO 2013009117A2 KR 2012005550 W KR2012005550 W KR 2012005550W WO 2013009117 A2 WO2013009117 A2 WO 2013009117A2
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WIPO (PCT)
Prior art keywords
touch
voltage
area
mode
capacitor
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PCT/KR2012/005550
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English (en)
Korean (ko)
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WO2013009117A3 (fr
Inventor
박지현
오영진
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material

Definitions

  • the present invention relates to a user input sensing device and an electronic device including the same. More particularly, the present invention relates to a touch sensing device and an electronic device including the same.
  • the touch panel is an input device that allows a user's command to be input by touching with a human hand or other contact means based on the content displayed by the image display device.
  • the touch panel is provided on the front face of the image display device to convert a contact position directly contacted by a human hand or other contact means into an electrical signal. Accordingly, the instruction selected at the contact position is received as an input signal.
  • Such a touch panel can replace an input device such as a keyboard and a mouse, its use range is gradually being expanded.
  • the capacitive touch panel converts a contact position into an electrical signal by detecting a change in capacitance that a conductive sensing pattern forms with other surrounding sensing patterns or ground electrodes when a human hand or an object comes in contact.
  • the sensing pattern includes a first sensing pattern (X pattern) formed to be connected along the first direction and a second sensing pattern (Y pattern) formed to be connected along the second direction to determine a contact position on the contact surface. .
  • 1 is an exploded plan view of a conventional touch panel.
  • the conventional touch panel 10 includes a transparent substrate 11, a first sensing pattern 12, a first insulating layer 13, a second sensing pattern 14, and a metal pattern 15 sequentially formed on the transparent substrate 11. And a second insulating film 16.
  • the first sensing pattern 12 is formed to be connected in a first direction on one surface of the transparent substrate 11.
  • the first sensing pattern 12 may be formed in a regular pattern in which a plurality of diamond shapes are lined up on the transparent substrate 11.
  • the first sensing pattern 12 may be formed of a plurality of X patterns formed such that the first sensing patterns 12 positioned in one column having the same X coordinate are connected to each other.
  • the first sensing pattern 12 includes a pad 12a to be electrically connected to the metal pattern 15 in units of columns.
  • the pads 12a of the first sensing pattern 12 may be formed in units of columns.
  • the second sensing pattern 14 is formed to be connected in a second direction on the first insulating layer 13, and is alternately disposed with the first sensing pattern 12 so as not to overlap the first sensing pattern 12.
  • the second sensing pattern 14 may be formed of the same diamond pattern as the first sensing pattern 12, and the second sensing patterns 14 positioned in one row having the same Y coordinate are connected to each other. .
  • the second sensing pattern 14 includes a pad 14a to be electrically connected to the metal pattern 15 in a row unit.
  • the pad 14a of the second sensing pattern 14 may be formed in a row unit.
  • the first and second sensing patterns 12 and 14 are made of a transparent conductive material such as indium tin oxide (hereinafter referred to as ITO), and the first insulating layer 13 is made of a transparent insulating material.
  • ITO indium tin oxide
  • Each of the sensing patterns 12 and 14 of the unit is electrically connected to a position detection line (not shown) to supply a contact position signal to a driving circuit (not shown) or the like.
  • the conventional touch panel 10 should have an ITO pattern in each layer for X and Y, and an insulation layer must be provided between the X and Y layers, the thickness increases.
  • touch detection is required to detect capacitive changes at a high frequency. This requires complex computational and statistical processing.
  • the difference between the electrical signals before and after the touch is extremely minute, it is influenced by the wiring resistance, which requires a metal wiring such as the metal pattern 15 to maintain the low resistance. An additional mask process is needed to form this metal pattern 15.
  • the touch panel 10 detects a touch by using a minute change in capacitance accumulated several times through a complicated calculation, the touch panel 10 cannot calculate an accurate touch area. Thus, it was practically impossible for a user to use the touch area as one means of user input.
  • An electronic device using a touch panel as an input device has a touch panel attached to a display device (for example, a liquid crystal panel or an organic light emitting diode (OLED) panel) and uses a graphic user interface (GUI). Command from the user.
  • the user may select an icon on the display screen or execute a command corresponding to the icon by touching an icon displayed on the display screen with a finger or other contact means, and also scroll the display screen using a movement of the touched finger or the like. can do.
  • the present invention provides a user input sensing device, a plurality of electrode pads of a transparent material arranged in a matrix form;
  • a driving unit including a switch and a first capacitor electrically connected to the plurality of electrode pads, and configured to output a voltage change in response to a voltage signal applied to the first capacitor after charging and floating the electrode pad using the switch.
  • a detector configured to output a touch detection value based on a difference between the output voltage change before and after the touch;
  • a signal processor configured to calculate a touch area using the touch detection value and calculate touch coordinates using the touch area.
  • the signal processor may calculate the touch area by extracting a touch cell group corresponding to touched adjacent electrode pads and summing touch detection values of the touched touch cell group.
  • the signal processor may calculate multi-touch coordinates by using touch areas of a plurality of touch cell groups.
  • the apparatus may further include a mode switching unit for switching the first mode and the second mode.
  • first mode and the second mode may be different in magnitude of the voltage signal applied to the first capacitor.
  • the present invention provides a display device including a touch detection function, comprising: a first substrate and a second substrate facing each other; A liquid crystal layer, a color filter layer, and a thin film transistor array layer positioned between the first substrate and the second substrate; And a plurality of electrode pads disposed on one surface of both surfaces of the first substrate, wherein the electrode pads detect a touch by a user input device.
  • the present invention is a drive device for driving a display device and a user input device, comprising a display device driver and a touch panel driver, wherein the touch panel driver includes a driver, a detector and a signal processor of the user input device. It provides a driving device.
  • a true one-layer touch panel made of only a transparent conductive material may be implemented.
  • the implemented touch panel may be easily integrated into an electronic device such as a display device.
  • 1 is an exploded plan view of a conventional touch panel.
  • FIG. 2 is a block diagram of a touch sensing apparatus according to an embodiment of the present invention.
  • FIG. 3 is an equivalent circuit diagram of a touch cell according to an embodiment of the present invention.
  • FIG. 4 is a waveform diagram of a touch cell according to an embodiment of the present invention.
  • FIG. 5 is a schematic block diagram of a touch cell and a detector according to an embodiment of the present invention.
  • FIG. 6 is a graph for explaining an operation of a detector according to an exemplary embodiment of the present invention.
  • FIG. 7 is a graph showing a voltage difference between a touch cell and a reference cell as a function of touch capacitance according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram illustrating a correspondence relationship between a touch cell and a memory in a touch sensing apparatus according to an embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a method of calculating touch area and touch coordinates according to an embodiment of the present invention.
  • 10 to 13 are diagrams illustrating in detail a method of calculating a touch area and touch coordinates according to an embodiment of the present invention.
  • FIG. 14 is a block diagram of an electronic device according to an embodiment of the present disclosure.
  • FIG. 15 is a diagram illustrating a touch panel integrated display device according to an exemplary embodiment of the present invention.
  • 16 is a diagram illustrating a touch panel integrated display device according to another exemplary embodiment of the present invention.
  • 17 is a view showing a driving apparatus according to an embodiment of the present invention.
  • FIG 18 illustrates an electronic device capable of switching modes according to an embodiment of the present invention.
  • 19 is a flowchart illustrating a mode switching method according to an embodiment of the present invention.
  • ... unit ... unit
  • module etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.
  • FIG. 2 is a block diagram of a touch sensing apparatus according to an embodiment of the present invention.
  • the touch sensing device includes a touch panel and a driving device.
  • the touch panel includes a plurality of electrode pads 110 formed on a substrate 100 such as glass or plastic film made of transparent material and a plurality of signal wires 120 connected thereto.
  • the plurality of electrode pads 110 may be, for example, rectangular or rhombic, but is not limited thereto.
  • the electrode pad 110 may be implemented in a polygonal shape of a uniform shape.
  • the electrode pads 110 may be arranged in the form of a matrix of substantially adjacent polygons.
  • Each signal line 120 has one end connected to the electrode pad 110 and the other end extending to the bottom edge of the substrate 100.
  • the line width of the signal wire 120 may be designed to be considerably narrow, on the order of several tens to several tens of micrometers.
  • the electrode pad 110 and the signal wire 120 may be made of a transparent conductive material such as indium-tin-oxide (ITO), indium-zinc-oxide (IZO), carbon nanotube (CNT), graphene, or graphene. .
  • ITO indium-tin-oxide
  • IZO indium-zinc-oxide
  • CNT carbon nanotube
  • graphene or graphene.
  • the electrode pad 110 and the signal wiring 120 can be formed at the same time by, for example, laminating an ITO film on the substrate 100 by sputtering or the like and then patterning the same using an etching method such as photolithography.
  • the electrode pad 110 and the signal wire 120 may be covered with a transparent insulating film (not shown).
  • the driving device for driving the touch panel may be directly mounted on a part of the substrate 100 or may be formed on a circuit board 200 such as a printed circuit board or a flexible circuit film.
  • the driving device may include a driver 210, a detector 220, a signal processor 230, a memory 240, and the like, and may be implemented as one or more integrated circuit (IC) chips.
  • IC integrated circuit
  • the driver 210 is connected to the signal wire 120, receives a signal from the signal processor 230, drives circuits for touch detection, and outputs a voltage corresponding to the determination result of the touch detection.
  • the driving unit 210 may include a plurality of switches and a capacitor connected to the electrode pad 110.
  • the detector 220 is connected to the driver 210 and converts, amplifies, or digitizes the difference in the voltage change of the electrode pad 110 received from the driver 210 to be stored in the memory 240.
  • the detector 220 may include an amplifier and an analog-digital converter.
  • the signal processor 230 applies a signal for controlling the driver 210 or processes the digital voltage stored in the memory 240 to generate necessary information.
  • the signal processor 230 may be implemented by being separated into an analog signal processor and a digital signal processor.
  • the analog signal processor may control the driver 210, and the digital signal processor may calculate the touch area and the touch coordinates based on the difference in the voltage change detected by the detector 220.
  • the signal processor 230 may include a micro controller unit (MCU), and may perform predetermined signal processing through firmware.
  • MCU micro controller unit
  • the memory 240 stores predetermined data used for touch detection, area calculation, touch calculation, or data received in real time according to a command of the signal processor 230.
  • the driver 210, the detector 220, the signal processor 230, and the memory 240 may be separated from each other, or two or more components may be integrated and implemented.
  • FIG. 3 is an equivalent circuit diagram of a touch cell according to an embodiment of the present invention
  • FIG. 4 is a waveform diagram of a touch cell according to an embodiment of the present invention.
  • the driving unit 210 may include a plurality of transistors Q and a plurality of first capacitors C1 that perform a switching operation, and may further include a plurality of pad capacitors Cp.
  • the transistor Q, the first capacitor C1 and the pad capacitor Cp may be grouped one by one for the electrode pad 110 and the signal wire 120, and in the future, the electrode pad 110, the signal wire 120,
  • the transistor Q, the first capacitor C1 and the pad capacitor Cp are collectively referred to as a "touch cell".
  • the touch cell is a concept including a case where each component is electrically connected by a multiplexer.
  • the transistor Q is a field effect transistor, for example, a control voltage Vc may be applied to a gate, a data voltage Vd may be applied to a source (or a drain), and a drain (or source) may be a signal wire ( 120).
  • the control voltage Vc and the data voltage Vd may be applied by the control of the signal processor 230.
  • the transistor Q other devices capable of switching may be used.
  • the first capacitor C1 may be formed between the gate and the drain of the transistor Q, and may be formed separately from the transistor Q by a designer to secure a necessary capacity.
  • the voltage signal applied to the first capacitor C1 may be the same signal as the voltage signal applied to the gate of the transistor Q, but a separate voltage signal if the first capacitor C1 is formed separately from the transistor Q May be applied.
  • the voltage signal applied to the first capacitor C1 is preferably a square wave signal, and may be applied when the transistor Q is turned on and then turned off.
  • the pad capacitor Cp is a kind of parasitic capacitance formed by the electrode pad 110, the signal wiring 120, or the like.
  • the pad capacitor Cp may include any parasitic capacitance generated by the driver 210, the touch panel, and the image display device.
  • reference numeral Ct denotes a capacitance formed between the electrode pad 110 and the user's finger when the user touches the electrode pad 110.
  • the cell can be arranged in a position that the user can not touch, or a cell having an electrical characteristic that is not always touched, which will be referred to as a "reference cell".
  • the "reference cell” may exist physically, but may be a virtual cell having only data values.
  • the signal processor 230 may apply the data voltage Vd and the control voltage Vc to the source and gate of the transistor Q, respectively.
  • the transistor Q After the data voltage Vd rises, the transistor Q is turned on when the control voltage Vc applied to the gate rises from the low voltage VL to the high voltage VH. Accordingly, the electrode pad is charged with the data voltage Vd, and the output voltage Vo will be the data voltage Vd.
  • the transistor Q is turned off, and the electrode pad 110 is in a floating state.
  • the voltage level of the output voltage Vo of the electrode pad 110 may drop instantaneously due to the level drop of the square wave applied to the first capacitor C1. This voltage drop is sometimes called "kick-back.”
  • V1 (C1 / (C1 + Cp)) (VH-VL)
  • Equation 1 is easily derived from equations for calculating the total charge amount before and after voltage drop.
  • a capacitor Ct is formed between the electrode pad 110 and the user's finger or the contact means, thereby forming an electrode.
  • a touch capacitor Ct is added in addition to the first capacitor C1 and the pad capacitor Cp.
  • the voltage drop V2 of the electrode pad 110 by these three capacitors C1, Cp, and Ct becomes as follows.
  • V2 (C1 / (C1 + Cp + Ct)) (VH-VL)
  • the voltage drop V2 when there is a touch (Case 2) is smaller than the voltage drop V1 when there is no touch (Case 1).
  • the difference between the voltage drop V2 and the voltage drop V1 depends on the touch capacitance Ct.
  • the touch area may be calculated using the difference in voltage drop of the electrode pads 110 before and after the touch. A detailed description of the touch area calculation will be described later.
  • the touch may be detected from the difference in the variation value of the output voltage Vo before and after the touch (that is, the difference between the voltage drop V2 and the voltage drop V1).
  • FIG. 5 is a schematic block diagram of a touch cell and a detector according to an embodiment of the present invention.
  • the detector may include an amplifier 222 and an analog-digital converter (ADC) 224.
  • ADC analog-digital converter
  • the two inputs of the amplifier 222 may be an output voltage Vo of the touch cell 250 and an output voltage Vr of the reference cell 260, and the amplifier 222 may have a difference between the two output voltages Vo and Vr. It may be a differential amplifier for amplifying and outputting.
  • Va represents the output voltage of the amplifier 222
  • VaD represents the digitization of the output voltage of the amplifier 222.
  • the touch cell 250 includes the electrode pad 110, the signal wire 120, the transistor Q, the first capacitor C1, and the pad capacitor Cp shown in FIG. 3, and there is a touch.
  • the reference cell 260 refers to a touch cell that does not include a touch capacitor Ct because a user's touch does not occur as mentioned above.
  • Equation 3 The voltage difference ⁇ V between the touch cell Vo and the reference cell Vr at the time when the control voltage Vc falls from the high voltage VH to the low voltage VL is expressed by Equation 3 below.
  • FIG. 6 is a graph illustrating the output of an amplifier in an embodiment of the present invention.
  • the amplifier 222 is a differential amplifier
  • the difference voltage ⁇ V is linearly amplified, but is saturated and outputs a constant value above a specific value.
  • the output voltage Va of the amplifier 222 may be Vas when the difference voltage ⁇ V is greater than or equal to the saturation voltage ⁇ Vs, and when it is smaller than this, the output voltage Va may have a magnitude proportional to the difference voltage ⁇ V. have. For example, if the difference voltage ⁇ V is 0, the output voltage Va is also 0, if the difference voltage ⁇ V is ⁇ V1, the output voltage Va is Va1, and if the difference voltage ⁇ V is ⁇ V2, the output voltage Va is When Va2 and the difference voltage ⁇ V are ⁇ V3, the output voltage Va may be Va3.
  • the difference voltage ⁇ V has a maximum value. It will not increase anymore.
  • linearity may be imparted to the amplifier.
  • the linearity can be used to calculate an accurate touch area.
  • the output voltage Va of the amplifier 222 is input to the ADC 224, and the ADC 224 may convert the input analog voltage Va into a digital signal VaD and output the digital signal VaD.
  • the ADC 224 may divide the output voltage Va of the amplifier 222 into four sections and give a two-bit digital value in order of magnitude to each section.
  • the amplifier 222 output voltage Va is about 0 to Va1, 00 for Va1 to Va2, 01 for Va2 to Va3, 10 for Va2 to Va3, and 11 for Va3 or more. Can be given.
  • setting the digital value to 2 bits is just one example. Other examples are 4 bits, 8 bits, and 10 bits.
  • FIG. 7 is a graph illustrating a relationship between a difference voltage and a touch capacitance in an embodiment of the present invention.
  • the touch capacitance Ct of Equation 3 is rearranged as a function of the difference voltage ⁇ V as follows.
  • K1 C1 (VH-VL)
  • K2 C1 + Cp
  • K1 and K2 are constants and greater than zero
  • the touch area A cannot be larger than the area of the electrode pad 110, as described above, when the entire area of the electrode pad 110 is completely covered by a touch such as a finger, the difference voltage ⁇ V is a maximum value.
  • the touch area A also becomes the maximum value.
  • the graph of FIG. 7 shows that the difference voltage ⁇ V is effective in a range between 0 and the maximum value ⁇ V_max, and the linearity between the difference voltage ⁇ V and the touch area A may be given using this characteristic. have.
  • a linear function may be generated in the valid period and the output value of the generated linear function may be matched for each difference voltage ⁇ V.
  • linearity can be imparted between the difference voltage ⁇ V and the touch area A by applying a predetermined weight to the output of each difference voltage ⁇ V.
  • linearity may be imparted by using an inverse function of the difference voltage ⁇ V and the touch area A, such as gamma correction.
  • This correction for linearity can reduce the amount of computation since the number of samples to be processed is limited if processed after or simultaneously with the analog-to-digital conversion.
  • the amplification value Va of the difference voltage ⁇ V is also the touch area A.
  • the digitized value VaD of the amplification value Va also has a linearity with the touch area A.
  • the relationship between the difference voltage ⁇ V defined by the various embodiments described above, its amplification value Va or VaD, and the touch area A is referred to as "substantially linear proportionality".
  • the touch sensing apparatus can detect a very accurate touch area and coordinates.
  • FIG. 8 is a schematic diagram illustrating a correspondence relationship between a touch cell and a memory in a touch sensing apparatus according to an embodiment of the present invention.
  • the memory 240 illustrated in FIG. 2 may be, for example, a plurality of memories having addresses corresponding to the touch cells 250 (strictly speaking, the electrode pads 110 should be used as the touch cells 250 for convenience of description). Cells, each memory cell may store amplified and digitized difference voltage VaD through the amplifier 222 and the ADC 224.
  • the amplified and digitized difference voltage VaD is substantially linearly proportional to the touch area for the electrode pad 110.
  • the amplified and digitized difference voltage VaD is treated the same as the touched digital area value.
  • the amplified and digitized difference voltage VaD is a value related to touch detection and is referred to as " touch detection value VaD " for convenience.
  • the touch detection value VaD may have four values of 00, 01, 10, and 11.
  • 00 means no touch
  • 11 means that the entire electrode pad is touched and covered.
  • the size of the touch detection value VaD corresponds to the size of the touch area for one electrode pad.
  • FIG. 8 illustrates a touch cell of C1 to C16 and a memory cell of M1 to M16, and M1 to M16 correspond to C1 to C16, respectively.
  • Touch occurs in touch cells C6, C7, C10, C11, C14, and C15, C6 is about 2/5 of the total area, C7 is about 3/5, C10 and C11 are all, C14 and C15 are about 1 Suppose that / 10 or less touched your finger.
  • 00 is stored in the memory cells C1 to C5, C8, C9, and C12 to C16 corresponding to the touch cells C1 to C5, C8, C9, and C12 to C16 having little or no touch, and 01 and M7 to M6.
  • 11 may be stored in 10, M10, and M11.
  • the signal processor 230 may read the digital area values of the touch cells C1 to C16 from the memory 240 to determine the touch area and the touch position. This will be described in detail with reference to FIGS. 9 to 13.
  • FIG. 9 is a flowchart illustrating a method of calculating touch area and touch coordinates according to an embodiment of the present invention.
  • the touch sensing apparatus first measures the touch detection value VaD of each touch cell (S10).
  • each electrode pad 110 is scanned in a predetermined frequency and order.
  • a touch cell in which the touch detection value VaD is not 0 is determined to have a touch, and the touch detection value VaD is recorded in the memory 240 corresponding to each touch cell.
  • a touch cell group consisting of adjacent touch cells whose touch detection value VaD is not 0 is extracted (S20).
  • the electrode pads 110 are each implemented in an isolated matrix form, the electrode pads 110 provide a multi-touch sensing function. Therefore, when multi-touch occurs, it is necessary to group touch cells in which touch occurs in order to calculate respective touch areas and coordinates.
  • the area of the touch area is calculated based on the touch detection value VaD of the touch cell group (S30). As described above, since the touch detection value VaD and the touch area are proportional to each other, the touch area may be calculated by summing the touch detection values VaD in the touch cell group.
  • the coordinates of the touch area are calculated from the calculated area of the touch area (S40).
  • the electrode pad 110 has a polygonal shape having a uniform size, and is densely arranged in a matrix form. Therefore, the image display device is covered in a state in which each of the electrode pads 110 has a predetermined area and address. Therefore, the occupation area of the electrode pad 110 may be matched with the coordinates of the image display device.
  • the touch area distribution of the X-axis and Y-axis of the electrode pad matrix can be obtained.
  • the touch coordinates can be calculated very accurately using the structure of the touch panel and the calculated touch area.
  • the process illustrated in FIG. 9 may be performed by a signal processor disposed inside and outside the touch sensing apparatus.
  • 10 to 13 are diagrams illustrating a process of calculating a touch area and a touch position according to an embodiment of the present invention.
  • FIG. 8 When the touch position of FIG. 8 is displayed as an area, it becomes a hatched area of FIG. 10.
  • a group consisting of four adjacent touch cells having a digital area value other than 00, for example, 2 ⁇ 2 cells is taken, and the sum of the digital area values of the touch cells belonging to this group, that is, 01, 10, 11, 11 is discretized. Can be regarded as a touch area.
  • the area value can be calculated because the touch detection value VaD and the touch area have a substantially linear proportional relationship.
  • a 2 ⁇ 2 cell group has been described as an example, a group consisting of more or fewer cells may be selected according to the size of the electrode pad and the size of the touch area.
  • the value of the touch cell is displayed as a 2-bit digitized touch detection value VaD, a total of four area values may be obtained for one cell, and 16 area values may be obtained in a 2 ⁇ 2 cell group.
  • the calculated area value can be more accurate, and the size of the adjacent touch cell group having a non-zero digital area value can be larger.
  • FIG. 11 illustrates a method of calculating touch coordinates according to an embodiment of the present invention.
  • the center position of the touch area illustrated in FIG. 10 may be a point indicated by X.
  • FIG. For the 2x2 touch cell group, the digital area value of the touch cells at the top left, top right, bottom left, and bottom right, that is, 01101111, which is a value of 01, 10, 11, and 11 in succession, is defined as a value representing a touch position.
  • the coordinates of the corresponding center position X can be shaped into a lookup table and stored in internal or external memory.
  • the touch coordinates may be calculated in real time based on a mutual relationship between the coordinates of the touch cell and the digital area value of the touch cell.
  • FIG. 12 is a diagram illustrating a method of calculating touch coordinates according to another embodiment of the present invention.
  • the digital area values of the touch cells are summed and graphed for each row X axis and each column Y axis of the touch cell group in the form of a 2 ⁇ 2 matrix.
  • FIG. 12 shows graphs at the bottom and the right, respectively.
  • the sum of the digital area values corresponding to the first column is 01 + 11, and likewise, the sum of the digital area values corresponding to the second column is 10 + 11.
  • the graph finds the X coordinate that bisects the value integrated on the X axis (that is, the area of the area between the horizontal axes).
  • the digital area value for the first row is 01 + 10 and 11 + 11, the sum of the digital area values for the second row.
  • the Y coordinate is found to be bisected by the value integrated on the Y axis (that is, the area of the area lying between the vertical axes).
  • the touch coordinates can be calculated by obtaining the x coordinates and the y coordinates as the centers of the touch areas.
  • the coordinates in the electrode pad matrix may match the coordinates of the image display device. Therefore, by using the coordinates of the center position of the area distribution of the X-axis and the Y-axis in the touch cell group in which the touch has occurred, the center position of the entire touch area may be calculated in the image display device.
  • the signal processor 230 may determine the touch position by using the touch area occupying each cell in this manner. Even when the value of the touch cell is displayed as 2 bits, a total of 256 positions can be obtained for one block, and thus a touch coordinate resolution higher than the number of touch cells can be obtained.
  • the resolution of the touch coordinates will be much higher. That is, if the digitized area value is provided with a higher bit, it is possible to detect a change in the fine touch area distribution and use it to detect a change in the fine touch coordinates.
  • FIG. 13 is a diagram illustrating touch coordinates and a touch area together based on an embodiment of the present invention.
  • an accurate touch area is calculated by adding digital area values of touch cells belonging to a touch cell group, which is a set of touch cells having a non-00 digital area value. By properly processing the distribution of area values, the exact center position of the contact can be found.
  • shape information of a region in which a touch occurs may be provided using coordinate information of a touch cell in which a touch occurs. For example, in FIG. 13, since a touch occurs in a 2 ⁇ 2 touch cell group, a circular touch area having a detected area may be calculated. However, if a touch occurs in a 2 ⁇ 3 touch cell group, an elliptical touch area having a long vertical axis may be calculated. Therefore, according to an embodiment of the present invention, the shape of the touch area may also be used as one of user inputs.
  • the touch area value in the touch cell of the touch cell group is considered, a more precise shape of the touch area may be calculated.
  • the touch area and the touch position thus obtained are determined by an electronic device including a display device associated with the touch sensing device, for example, a smart phone, a tablet PC, a mobile phone, an electronic notebook, a personal digital assistant (PDA), a web. It may be used as an input gesture for driving a pad, a portable multimedia player (PMP), an MP3 player, or the like.
  • a display device associated with the touch sensing device for example, a smart phone, a tablet PC, a mobile phone, an electronic notebook, a personal digital assistant (PDA), a web. It may be used as an input gesture for driving a pad, a portable multimedia player (PMP), an MP3 player, or the like.
  • PMP portable multimedia player
  • MP3 player MP3 player
  • FIG. 14 is a block diagram of an electronic device according to an embodiment of the present disclosure.
  • an electronic device 300 may include a touch panel 150, an input detector 270, an application processor 310, a display 320, and a memory 330. Include.
  • the touch panel 150 includes the substrate 100 shown in FIG. 2, a plurality of electrode pads 110, and a plurality of signal wires 120, and is combined with the display unit 320 to be integrated with the display unit 320. It may be, but is not limited to such. Since the touch panel 150 is the same as described in the above embodiment, a detailed description thereof will be omitted.
  • the input detector 270 includes the driver 210, the detector 220, the signal processor 230, and the memory 240 illustrated in FIG. 2, and touches a touch area and touch coordinates with respect to a user's touch input. The information is calculated and transmitted to the application processor 310. Since the input detector 270 is the same as described in the foregoing embodiment, a detailed description thereof will be omitted.
  • the application processor 310 executes an instruction and generates or uses data. For example, the application processor 310 may process input and output data between the components of the electronic device 300, and interpret the touch information received from the input detector 270 to display the image accordingly. ) Can be displayed.
  • the application processor 310 may be implemented on a single chip, a plurality of chips, or a plurality of electrical components, and may include, for example, a dedicated or embedded processor, a single purpose processor, a controller, or an application specific semiconductor (ASIC). .
  • the display unit 320 outputs various types of information to a screen and provides the information to a user.
  • the display unit 320 may include a liquid crystal display, an organic light emitting diode, and the like.
  • the display unit 320 may display a graphical user interface (GUI).
  • GUI graphical user interface
  • the graphical user interface provides an interface that allows a user to easily use an application running on the electronic device 300.
  • the graphical user interface may, for example, represent a program, function, file, and operation options in a graphical image.
  • Graphical images may include, for example, windows, dialogs, menus, icons, buttons, cursors, scroll bars, and the like. These images can be arranged in a predefined layout or dynamically generated to help the user do what they want.
  • the user can select and activate an image or perform a preset action on the image to initiate functions and tasks associated with the various graphical images.
  • the memory 330 provides a place for storing executable code and data used by the electronic device 300.
  • the memory 330 stores data according to a request from the application processor 310, and provides instructions and / or data to the application processor 310.
  • the memory 330 may include read-only memory (ROM), random access memory (RAM), flash memory, or the like.
  • FIG. 15 illustrates a display device in which a touch panel is integrated according to an embodiment of the present invention.
  • the display device 400 including a touch function includes a first substrate 410, a second substrate 412, a liquid crystal layer 414, a thin film transistor array layer 416, and a color filter layer ( 418, a conductive film 420, and a touch panel 450.
  • the first substrate 410 and the second substrate 412 face each other.
  • the liquid crystal layer 414, the thin film transistor array layer 416, and the color filter layer 418 are positioned between the first substrate 410 and the second substrate 412.
  • the thin film transistor array layer 416 and the color filter layer 418 are positioned with the liquid crystal layer 414 therebetween.
  • the thin film transistor array layer 416 includes a plurality of thin film transistors (TFTs). A gate line is connected to the gate electrode of the thin film transistor, a data line crossing the gate line is connected to the source electrode, and a pixel electrode is connected to the drain electrode.
  • TFTs thin film transistors
  • the pixel electrode is formed at the intersection of the gate line and the data line, and forms a vertical or horizontal electric field with the common electrode of the color filter layer 418 to control the liquid crystal movement of the liquid crystal layer 414.
  • the color filter layer 418 includes a color filter for implementing R, G, and B images, and a black matrix formed between the color filters and for increasing contrast and absorbing external light.
  • the sealing member 422 is disposed along the edges of the first and second substrates 410 and 412 to bond the first and second substrates 410 and 412.
  • the conductive film 420 is formed on the second substrate 412.
  • the conductive film 420 blocks an external electric field that may affect driving of the liquid crystal layer 414.
  • the conductive film 420 blocks the external electric field that may affect the operation of the liquid crystal layer 414 as described above.
  • the conductive film 420 may be made of ITO.
  • the touch panel 450 is formed on the conductive layer 420 with the insulating layer 424 interposed therebetween.
  • the insulating layer 424 may include SiO 2 or SiNX.
  • the first polarizer 426 is formed on the lower side of the first substrate 410 and on the opposite side of the thin film transistor array layer 416 based on the first substrate 410, and the upper side of the touch panel 450 and the touch.
  • the second polarizer 428 is positioned on the opposite side of the insulating layer 424 with respect to the panel 450.
  • the first polarizer 426 and the second polarizer 428 display an image by controlling the polarization of light.
  • FIG. 16 illustrates a display device in which a touch panel is integrated according to another exemplary embodiment of the present invention.
  • the conductive layer 420 ′ may cover the inner surface of the second substrate 412, that is, the liquid crystal layer 414. It is formed on one surface of the second substrate 412 facing.
  • the touch panel 450 is formed on the other surface of the second substrate 412.
  • the second substrate 412 also serves as the insulating layer 424 shown in FIG. 15, the configuration of the display device can be simplified.
  • the touch panel according to the exemplary embodiment of the present invention can be implemented using only a single layer of the transparent conductive material, the touch panel can be implemented on the upper or lower portion of the upper substrate of the display device as shown in FIG. 15 or 16. Therefore, the thickness of the electronic device including the touch panel can be reduced, and the production cost can be significantly reduced by patterning the pattern of the touch panel during the manufacturing process of the display device.
  • the IC of the user input device can be manufactured integrally with the driving IC of the display device.
  • 17 is a diagram for describing a user input device and a driving device of a display device, according to an exemplary embodiment.
  • the driving device 500 includes a display device driver 510 and a touch panel driver 520, wherein the touch panel driver 520 and the display device driver 510 are integrated to form a single integrated circuit chip. Is implemented.
  • the display device driver 510 includes a data processor 512, a memory 517, a duty controller 513, a converter 514, and a driver 515.
  • the data processor 512 calculates an RGB value of image data received from a controller (not shown) of the terminal.
  • the duty controller 513 calculates the duty by using the RGB value output from the data processor 512, and outputs a PWM signal having this duty.
  • the memory 517 stores image data input from a control unit (not shown) of the terminal.
  • the converter 514 reads the image data from the memory 517 and converts the image data according to a predetermined lookup table.
  • the look up table is a table in which a gradation level represented by an input image signal and an input level to a display device (LCD panel) corresponding to the gradation level are associated.
  • the driver 515 drives the display device according to the signal output from the converter 514.
  • the touch panel driver 520 includes a signal input / output unit 522, a signal processor 525, and a timing controller 527. Although not shown in FIG. 17, the touch panel driver 520 may further include memory means for temporarily storing the touch position.
  • the touch panel driver 520 may be implemented in the form of an integrated circuit (IC) chip in a space adjacent or separated from the touch panel.
  • IC integrated circuit
  • the signal input / output unit 522 may include a transparent conductive pad (not shown) in a matrix form and a plurality of sensing switches (not shown) respectively corresponding to each other.
  • each of the transparent conductive pads may be respectively connected to the sensing switch through a transparent conductor wiring such as ITO.
  • ITO transparent conductor wiring
  • the conductive pads 110 located in one row and one column are electrically connected to each other through the sensing switch SW1 and the transparent conductor wiring.
  • the conductive pad 11 is electrically connected to the sensing switch SW7 through a transparent conductor wire.
  • the embodiment of the present invention shown in FIG. 17 monitors a DC component drop irrespective of a resistance value so that a touch is sensed at one time, thereby eliminating the need for a wiring pattern to be implemented as a metal wiring, and provides high signal-to-noise ratio (SNR) performance.
  • SNR signal-to-noise ratio
  • This provides a simple structure and high sensitivity compared to the prior art.
  • the bezel regions located at both sides of the terminal may be removed or minimized. Therefore, there is an effect that the size of the display screen can be further expanded in the terminal having the same size.
  • the signal processor 525 controls a signal input through the signal input / output unit 522 and processes a signal output from the signal input / output unit 522 to sense a touch.
  • the timing controller 527 provides timing information to the signal processor 525 to control data input timing and monitoring timing of a sensing switch (not shown).
  • the driving device in which the display device driver 510 and the touch panel driver 520 are integrated as described above is manufactured in the form of IC and attached to the glass of the display device or attached to the flexible PCB so as to drive signals to the display device and the touch panel, respectively.
  • the touch panel integrated display device illustrated in FIGS. 15 and 16 may be driven more efficiently.
  • FIG 18 illustrates an electronic device capable of switching modes according to an embodiment of the present invention.
  • the appearance of the electronic device 600 may be implemented in the form of a smart phone provided with a touch input.
  • Smartphones provide a variety of applications using their own operating system (OS) based on hardware that provides a processor, memory, GPS, Bluetooth, and mobile communications.
  • OS operating system
  • the switch 610 is a hardware switch that adjusts the touch sensitivity outside the touch input device 600. When the touch sensitivity is provided in the first mode and the second mode, the switch 610 toggles between the two modes in one operation.
  • the switch 610 may switch between the first mode and the second mode in software.
  • the switch 610 may be provided in the form of an application manufactured using the API when the operating system provides an API that allows the smartphone to adjust the control voltage or the magnitude (VH, VL) of the voltage applied to the first capacitor. .
  • the user may be set to automatically switch between the first mode and the second mode according to the season or temperature change using the application.
  • the electronic device 600 further includes a mode control unit (not shown) and a mode switching unit (not shown), and receive a mode switching command from an external hardware or software so that the touch modes have different touch sensitivitys. Can switch between and the second mode.
  • a mode control unit not shown
  • a mode switching unit not shown
  • a first mode providing bare touch recognition sensitivity and a second mode providing touch recognition sensitivity of a gloved hand will be described as an example.
  • the mode controller adjusts the levels VH and VL of the high signal and the low signal applied to the first capacitor in the floating state in response to the mode switch signal received through the mode switch.
  • a touch input may be received by sensing a capacitance Ct generated by a gloved hand.
  • the first mode may receive a touch input by detecting a capacitance Ct generated by a bare hand as usual.
  • Maintaining high sensitivity at all times, such as the second mode can detect touch input of both bare and gloved hands, but requires a higher voltage than the first mode, and malfunctions due to friction in the pocket or rubs on other parts of the body. Since there is a risk of malfunction by the user, it is preferable to maintain the first mode if there is no inconvenience.
  • the mode switch may be switched by an external switch operation, but may be automatically driven by sensing a season or an external temperature.
  • the first mode for detecting the touch of the bare hand and the second mode for detecting the touch of the gloved hand have been described as an example, an embodiment for switching more modes than this is possible.
  • a mode may be set that provides touch sensitivity for a stylus pen provided on a capacitive touch screen.
  • the sensitivity may be adjusted by changing other variables of Equations 1 and 2, and the sensitivity may be adjusted by changing the amplification factor of the differential amplifier or the buffer.
  • FIG. 19 is a flowchart illustrating a touch sensitivity control method according to an embodiment of the present invention.
  • the touch input device is set to a first predetermined sensitivity.
  • the mode switching may be performed by a switch means external to the touch input device or a switch means of software interoperating with the touch input device.
  • the sensitivity parameter is corrected in step S120. For example, if the difference between the high signal and the low signal of the voltage applied to the first capacitor C1 is increased, the sensitivity can be increased.
  • the touch input device is set to the second sensitivity.
  • the sensitivity of touch recognition may be set as the second sensitivity even with a gloved hand.
  • the first sensitivity and the second sensitivity may be set respectively by determining sensitivity parameters based on data obtained from actual use.
  • the second sensitivity may be displayed on the screen of the touch input device (S140).
  • the display allows the user to confirm the sensitivity currently set in his or her touch input device, and maintain or change the sensitivity according to the result of the confirmation.
  • the resolution and accuracy of the touch can be increased, and the touch area can be calculated.
  • a new touch input method may be provided using a touch area.

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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)
  • Push-Button Switches (AREA)

Abstract

La présente invention se rapporte à un dispositif d'entrée utilisateur comprenant un écran tactile monocouche qui est réalisé dans un matériau conducteur transparent. L'écran tactile monocouche peut être intégré dans un dispositif d'affichage. Il peut fonctionner dans un premier mode et dans un second mode, les sensibilités tactiles des premier et second modes étant différentes.
PCT/KR2012/005550 2011-07-12 2012-07-12 Dispositif de détection d'entrée utilisateur et dispositif électronique comprenant ledit dispositif de détection Ceased WO2013009117A2 (fr)

Applications Claiming Priority (12)

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KR20110068740 2011-07-12
KR10-2011-0068737 2011-07-12
KR10-2011-0068740 2011-07-12
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KR20110068737 2011-07-12
KR20110068731 2011-07-12
KR10-2011-0068729 2011-07-12
KR10-2011-0068731 2011-07-12
KR20110082516 2011-08-19
KR10-2011-0082516 2011-08-19
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016115813A1 (fr) * 2015-01-22 2016-07-28 京东方科技集团股份有限公司 Panneau tactile en cellule et dispositif d'affichage
CN109656399A (zh) * 2017-10-11 2019-04-19 原相科技股份有限公司 驱动集成电路、触控面板的驱动方法以及触碰控制系统

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JP2010250624A (ja) * 2009-04-16 2010-11-04 Seiko Epson Corp タッチセンサ機能付き表示装置
KR101071168B1 (ko) * 2009-08-04 2011-10-10 이성호 터치입력 인식방법 및 장치
KR101059098B1 (ko) * 2009-12-24 2011-08-24 이성호 터치패널의 터치셀 구조, 그를 이용한 터치패널 및 터치입력 검출방법
KR101008441B1 (ko) * 2010-04-16 2011-01-14 이성호 충전식 터치스크린 패널

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016115813A1 (fr) * 2015-01-22 2016-07-28 京东方科技集团股份有限公司 Panneau tactile en cellule et dispositif d'affichage
US9798418B2 (en) 2015-01-22 2017-10-24 Boe Technology Group Co., Ltd. In-cell touch panel and display device
CN109656399A (zh) * 2017-10-11 2019-04-19 原相科技股份有限公司 驱动集成电路、触控面板的驱动方法以及触碰控制系统
CN109656399B (zh) * 2017-10-11 2021-11-12 原相科技股份有限公司 驱动集成电路、触控面板的驱动方法以及触碰控制系统

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