WO2016195309A1 - 터치 압력을 감지하는 터치 입력 장치의 감도 보정 방법 및 컴퓨터 판독 가능한 기록 매체 - Google Patents
터치 압력을 감지하는 터치 입력 장치의 감도 보정 방법 및 컴퓨터 판독 가능한 기록 매체 Download PDFInfo
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- WO2016195309A1 WO2016195309A1 PCT/KR2016/005505 KR2016005505W WO2016195309A1 WO 2016195309 A1 WO2016195309 A1 WO 2016195309A1 KR 2016005505 W KR2016005505 W KR 2016005505W WO 2016195309 A1 WO2016195309 A1 WO 2016195309A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—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; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0447—Position sensing using the local deformation of sensor cells
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
Definitions
- the present invention relates to a method for compensating the sensitivity of a touch input device for sensing touch pressure and a computer readable recording medium. More particularly, the present invention relates to sensing touch pressure that can uniformly correct touch pressure sensitivity for a touch sensor panel. A method of correcting the sensitivity of a touch input device and a computer-readable recording medium recording a program for performing the same.
- buttons, keys, joysticks, and touch screens have been developed and used.
- the touch screen has various advantages such as ease of operation, miniaturization of a product, and simplification of a manufacturing process.
- the touch screen may constitute a touch surface of a touch input device that includes a touch sensor panel, which may be a transparent panel having a touch-sensitive surface. Such a touch sensor panel can be attached to the front of the touch screen so that the touch-sensitive surface can cover the touch screen.
- the user may operate the computing system by touching the touch screen with a finger or the like. Accordingly, the computing system recognizes whether the user touches the touch screen and the touch position and performs an operation according to the intention of the user.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a touch input device that senses touch pressure.
- Sensitivity correction method for achieving the above object is a sensitivity correction method of a touch input device for detecting touch pressure, for a plurality of sets of touch input device, a plurality of touch sensor panel provided in the touch input device Defining a point of and detecting an amount of change in capacitance by applying pressure to the plurality of points; Generating row data for each point of capacitance change amount based on the detected capacitance change amount for each set; Extracting a maximum value in each set, dividing a data value in the set by the maximum value, and generating decimal data for each set; Calculating an average value for each point based on the set of decimal value data; Generating representative value data by calculating an average value of all points of the touch sensor panel based on the average value of each point; Calculating a balance coefficient based on the representative value data; And correcting the touch pressure sensitivity of the touch input device by using the calculated balance coefficient.
- the method may further include calibrating an amount of capacitance change detected by the touch input device corrected in the correcting step by the formulas of Equations 3 to 7 to be described later.
- the average value of the frame corresponding to the saturated section among the frame data measured at the plurality of defined points may be calculated to determine the capacitance change amount of the corresponding point.
- the average value of the arbitrary points may be calculated by interpolating an arbitrary point other than the plurality of defined points based on the average value of the plurality of points. .
- the pressure applied to the plurality of points defined above may be a pressure applied by 800 g 8 phi.
- the plurality of points may include 45 points having an array of 5 horizontally and 9 vertically.
- the balance coefficient may be calculated by multiplying the representative value data by a predetermined coefficient (A).
- the balance coefficient may be calculated by multiplying the representative value data by a predetermined coefficient (A).
- the sensitivity correction method of the touch input device for detecting the touch pressure, detecting the amount of change in capacitance according to the pressure applied to the touch input device; And calibrating the detected capacitance change amount by any one of Equations 3 to 7 to be described later.
- the computer-readable recording medium for achieving the above object can record a program for executing the sensitivity correction method.
- the sensitivity correction method and the computer-readable recording medium of the input device it is possible to correct the sensitivity of the touch input device so that the touch pressure is sensed with a uniform sensitivity in front of the display.
- FIG. 1 is a schematic diagram showing the configuration of a touch input device to which the sensitivity correction method of the present invention is applied.
- FIG. 2 is a cross-sectional view of a touch input device configured to detect a touch position and a touch pressure to which a sensitivity correction method according to an embodiment of the present invention is applied.
- FIG. 3 is a view for explaining a process of generating raw data in the sensitivity correction method according to an embodiment of the present invention.
- FIG. 4 is a diagram illustrating decimal value data in a sensitivity correction method according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a process of interpolating representative values of all nodes in a sensitivity correction method according to an embodiment of the present invention.
- 6 and 7 are graphs for explaining the interpolation method used in the sensitivity correction method according to an embodiment of the present invention.
- FIG. 9 is a graph comparing the sensitivity of each node before the balancing process and the sensitivity of each node after the balancing process.
- FIG. 10 is a graph illustrating a problem caused by multiplication calibration in a calibration process of a sensitivity correction method according to an embodiment of the present invention.
- FIG. 11 is a graph illustrating an effect of an addition method calibration in a calibration process of a sensitivity correction method according to an embodiment of the present invention.
- FIGS. 12 and 13 are graphs for explaining the effects of a hybrid calibration in a calibration process of a sensitivity correction method according to an embodiment of the present invention.
- FIG. 14 is a graph illustrating a calibration for supplementing a hybrid scheme in a calibration process of a sensitivity correction method according to an embodiment of the present invention.
- FIG. 1 is a schematic diagram showing the configuration of a touch input device to which the sensitivity correction method of the present invention is applied.
- the touch sensor panel 100 of the present invention includes a plurality of driving electrodes TX1 to TXn and a plurality of receiving electrodes RX1 to RXm, for operation of the touch sensor panel 100.
- the touch sensor panel 100 may include a plurality of driving electrodes TX1 to TXn and a plurality of receiving electrodes RX1 to RXm.
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm of the touch sensor panel 100 form an orthogonal array, the present invention is not limited thereto.
- the driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm may have any number of dimensions and application arrangements thereof, including diagonal lines, concentric circles, and three-dimensional random arrays.
- n and m are positive integers, which may have the same or different values, and may have different sizes.
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm may be arranged to cross each other.
- the driving electrode TX includes a plurality of driving electrodes TX1 to TXn extending in the first axis direction
- the receiving electrode RX includes a plurality of receiving electrodes extending in the second axis direction crossing the first axis direction. RX1 to RXm).
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm may be formed on the same layer.
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm may be formed on the same surface of the insulating film (not shown).
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm may be formed on different layers.
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm may be formed on both surfaces of one insulating film (not shown), or the plurality of driving electrodes TX1 to TXn may be formed.
- One surface of one insulating film (not shown) and a plurality of receiving electrodes RX1 to RXm may be formed on one surface of a second insulating film (not shown) different from the first insulating film.
- the plurality of driving electrodes TX1 to TXn and the plurality of receiving electrodes RX1 to RXm are made of transparent conductive material (eg, tin oxide (SnO 2 ), indium oxide (In 2 O 3 ), or the like. Oxide) or ATO (Antimony Tin Oxide).
- transparent conductive material eg, tin oxide (SnO 2 ), indium oxide (In 2 O 3 ), or the like. Oxide) or ATO (Antimony Tin Oxide).
- the driving electrode TX and the receiving electrode RX may be formed of another transparent conductive material or an opaque conductive material.
- the driving electrode TX and the receiving electrode RX may include at least one of silver ink, copper, or carbon nanotube (CNT).
- the driving electrode TX and the receiving electrode RX may be formed of a metal mesh or made of a silver silver material.
- the driver 120 which is one component of the touch input device 100 according to an exemplary embodiment, may apply a driving signal to the driving electrodes TX1 to TXn.
- a driving signal may be sequentially applied to one driving electrode from the first driving electrode TX1 to the nth driving electrode TXn at a time.
- the driving signal may be repeatedly applied again. This is merely an example, and a driving signal may be simultaneously applied to a plurality of driving electrodes in some embodiments.
- the sensing unit 110 provides information about the capacitance Cm 101 generated between the driving electrodes TX1 to TXn to which the driving signal is applied and the receiving electrodes RX1 to RXm through the receiving electrodes RX1 to RXm.
- a sensing signal that includes a touch can detect whether the touch position.
- the sensing signal may be a signal in which the driving signal applied to the driving electrode TX is coupled by the capacitance CM 101 generated between the driving electrode TX and the receiving electrode RX.
- the process of detecting the driving signal applied from the first driving electrode TX1 to the nth driving electrode TXn through the receiving electrodes RX1 to RXm is referred to as scanning the touch sensor panel 100. can do.
- the sensing unit 110 may include a receiver (not shown) connected to each of the receiving electrodes RX1 to RXm through a switch.
- the switch is turned on in a time interval for detecting the signal of the corresponding receiving electrode RX, so that the detection signal from the receiving electrode RX can be detected at the receiver.
- the receiver may comprise an amplifier (not shown) and a feedback capacitor coupled between the negative input terminal of the amplifier and the output terminal of the amplifier, i.e., in the feedback path. At this time, the positive input terminal of the amplifier may be connected to ground.
- the receiver may further include a reset switch connected in parallel with the feedback capacitor. The reset switch may reset the conversion from current to voltage performed by the receiver.
- the negative input terminal of the amplifier may be connected to the corresponding receiving electrode RX to receive a current signal including information on the capacitance CM 101 and integrate the converted signal into a voltage.
- the sensing unit 110 may further include an analog to digital converter (ADC) for converting data integrated through a receiver into digital data. Subsequently, the digital data may be input to a processor (not shown) and processed to obtain touch information about the touch sensor panel 100.
- the detector 110 may include an ADC and a processor.
- the controller 130 may perform a function of controlling the operations of the driver 120 and the detector 110. For example, the controller 130 may generate a driving control signal and transmit the driving control signal to the driving unit 120 so that the driving signal is applied to the predetermined driving electrode TX at a predetermined time. In addition, the control unit 130 generates a detection control signal and transmits it to the detection unit 110 so that the detection unit 110 receives a detection signal from a predetermined reception electrode RX at a predetermined time to perform a preset function. can do.
- the driving unit 120 and the sensing unit 110 may detect whether or not a touch is applied to the touch sensor panel 100 of the touch input device 1000 according to an exemplary embodiment of the present invention. (Not displayed) can be configured.
- the touch input device 1000 according to an embodiment of the present invention may further include a controller 130.
- the touch input device 1000 including the touch sensor panel 100 may be integrated and implemented on a touch sensing integrated circuit (IC), which is a touch sensing circuit.
- IC touch sensing integrated circuit
- the driving electrode TX and the receiving electrode RX included in the touch sensor panel 100 may include, for example, a touch sensing IC through a conductive trace and / or a conductive pattern printed on a circuit board. It may be connected to the driving unit 120 and the sensing unit 110 included in the 150.
- a capacitance C having a predetermined value is generated at each intersection of the driving electrode TX and the receiving electrode RX, and such an electrostatic discharge occurs when an object such as a finger approaches the touch sensor panel 100.
- the value of the dose can be changed.
- the capacitance may represent mutual capacitance Cm.
- the sensing unit 110 may detect the electrical characteristic to detect whether the touch sensor panel 100 is touched and / or the touch position. For example, it is possible to detect whether and / or a position of the touch on the surface of the touch sensor panel 100 formed of a two-dimensional plane formed of a first axis and a second axis.
- the position of the touch in the second axis direction may be detected by detecting the driving electrode TX to which the driving signal is applied.
- the position of the touch in the first axis direction may be detected by detecting a change in capacitance from a received signal received through the receiving electrode RX when the touch is applied to the touch sensor panel 100.
- the touch sensor panel for detecting whether a touch is present and the touch position in the touch input device 1000 according to an embodiment of the present invention.
- the self-capacitance method, surface capacitance method, projected capacitance method, resistive film method, surface acoustic wave method (SAW), infrared method, optical method other than the above-described method It may be implemented using any touch sensing method such as an imaging method, a dispersive signal technology, and an acoustic pulse recognition method.
- the touch sensor panel 100 for detecting a touch position in the touch input device 1000 may be located outside or inside the display module 200.
- the display module 200 of the touch input device 1000 may be a liquid crystal display (LCD).
- LCD liquid crystal display
- IPS In Plane Switching
- VA Very Alignment
- TN twisted nematic
- the display module 200 of the touch input device 1000 according to an embodiment of the present invention may be a display panel included in a plasma display panel (PDP), an organic light emitting diode (OLED), or the like.
- PDP plasma display panel
- OLED organic light emitting diode
- the display module 200 receives an input from a central processing unit (CPU) or an application processor (AP), which is a central processing unit on a main board, for the operation of the touch input device 100. It may include a control circuit for displaying the content.
- CPU central processing unit
- AP application processor
- control circuit for operating the display panel 200 may include a display panel control IC, a graphic controller IC, and other circuits necessary for operating the display panel 200.
- FIG. 2 is a cross-sectional view of a touch input device configured to detect a touch position and a touch pressure to which a sensitivity correction method according to an embodiment of the present invention is applied.
- the touch sensor panel 100 and the pressure detection module 400 for detecting the touch position in the touch input device 1000 including the display module 200 may be attached to the front surface of the display module 200. Accordingly, the display screen of the display module 200 may be protected and the touch detection sensitivity of the touch sensor panel 100 may be increased.
- the pressure detection module 400 may operate separately from the touch sensor panel 100 for detecting the touch position, for example, the pressure detection module 400 may be the touch sensor panel 100 for detecting the touch position. May be configured to detect pressure alone. In addition, the pressure detection module 400 may be configured to detect the touch pressure in combination with the touch sensor panel 100 for detecting the touch position. For example, at least one of the driving electrode TX and the receiving electrode RX included in the touch sensor panel 100 for detecting the touch position may be used to detect the touch pressure.
- the pressure detection module 400 is combined with the touch sensor panel 100 to detect a touch pressure.
- the pressure detection module 400 includes a spacer layer 420 spaced apart from the touch sensor panel 100 and the display module 200.
- the pressure detection module 400 may include a reference potential layer spaced apart from the touch sensor panel 100 through the spacer layer 420.
- the display module 200 may function as a reference potential layer.
- the reference potential layer may have any potential to cause a change in the capacitance 101 generated between the driving electrode TX and the receiving electrode RX.
- the reference potential layer may be a ground layer having a ground potential.
- the reference potential layer may be a ground layer of the display module 200. In this case, the reference potential layer may have a plane parallel to the two-dimensional plane of the touch sensor panel 100.
- the touch sensor panel 100 and the display module 200 which is a reference potential layer are spaced apart from each other.
- the spacer layer 420 between the touch sensor panel 100 and the display module 200 may be implemented as an air gap according to a difference in the bonding method between the touch sensor panel 100 and the display module 200. Can be.
- a double adhesive tape may be used to fix the touch sensor panel 100 and the display module 200.
- each of the touch sensor panel 100 and the display module 200 has an overlapping area, and each side of the touch sensor panel 100 and the display module 200 is provided with a double-sided adhesive tape 430 in the edge region of the touch sensor panel 100 and the touch sensor panel 200.
- Two layers may be bonded to each other, but the touch sensor panel 100 and the display module 200 may be spaced apart from each other by a predetermined distance d.
- the capacitance 101 (Cm) between the driving electrode TX and the receiving electrode RX changes. That is, when the touch sensor panel 100 is touched, the mutual capacitance Cm 101 may be reduced compared to the basic mutual capacitance. This is because when an object, such as a finger, is close to the touch sensor panel 100, the object serves as a ground (GND), and the fringing capacitance of the mutual capacitance (Cm) 101 is absorbed into the object. to be.
- the basic mutual capacitance is a value of mutual capacitance between the driving electrode TX and the receiving electrode RX when there is no touch on the touch sensor panel 100.
- the touch sensor panel 100 may be bent when a pressure is applied when the object is touched with an upper surface that is a touch surface of the touch sensor panel 100. In this case, the value of the mutual capacitance 101 (Cm) between the driving electrode TX and the receiving electrode RX may be further reduced. This is because the touch sensor panel 100 is bent and the distance between the touch sensor panel 100 and the reference potential layer is reduced, so that the fringe capacitance of the mutual capacitance 101 (Cm) is absorbed not only by the object but also by the reference potential layer. Because it becomes. When the touch object is an insulator, the change in mutual capacitance Cm may be simply caused by a change in distance between the touch sensor panel 100 and the reference potential layer.
- the touch input device 1000 including the touch sensor panel 100 and the pressure detection module 400 on the display module 200 the touch pressure as well as the touch position may be simultaneously detected. have.
- the touch sensor is not disposed between the touch sensor panel 100 and the display module 200 for detecting the touch position, and the touch sensor is made of an adhesive such as an optically clear adhesive (OCA).
- OCA optically clear adhesive
- the configuration of the touch input device 1000 to which the sensitivity correction method is applied according to an embodiment of the present invention is described in order to explain the touch position and the touch pressure detection principle.
- the sensitivity correction method according to the present invention can be applied to a touch input device having a structure different from that shown in FIGS. 1 and 2 as long as the touch input device is capable of touch pressure.
- a sensitivity correction method of a touch input device that senses touch pressure includes a balance process and a calibration process.
- the balance process is a process for making the positional deviation in the plurality of touch input device sets uniform.
- the balance process may be performed using about 20 to 200 samples in the final pre-volume DVT step.
- the balance process consists of four steps to be described later: (1) low data measurement (2) average value calculation (3) ratio to maximum value calculation (4) interpolation.
- any one of these processes may be omitted, and other processes may be included.
- the balance coefficients of 0 to 255 8-bit ranges (8 bit range) for each node are obtained, and the balance coefficients are applied to the touch input device, thereby touching the touch input device.
- the sensitivity of the sensor panel is evenly compensated.
- a process for acquiring raw data is performed.
- a total of 45 points, consisting of 5 horizontal x 9 vertical, are measured using an 800 g 8 phi weight.
- the number of points may be more or less depending on the size of the touch sensor panel. This may be appropriately selected according to the size of the touch sensor panel and the state of each set.
- the pressure is applied using a weight of 800g, 8phi, to optimally model the index finger of a person.
- the weight or radius of the weight can be set differently.
- a device such as a key life tester or MUSASHI can be used to generate the capacitance change, ie, raw data, for positional pressure using an 800 g 8 phi weight. Can be.
- Pressure is applied to the 45 points with a weight of 800 g 8 phi, and the amount of change in capacitance at each point is detected.
- the detection of the capacitance change amount is as described above.
- the process of calculating the capacitance change data checks the frame data measured at each point, detects the capacitance change amount over time, finds a sufficiently saturated section, and finds N pieces (N in the region). Is averaged to determine the amount of change in capacitance at that point.
- the 3 shows frame data and saturated sections at one point.
- the x-axis represents time and the y-axis represents the amount of capacitance change detected in each frame.
- the unit of time may be about 5 ms per unit, but is not limited thereto and may be changed to another value.
- the number of frames used to calculate the average value for determining the capacitance change amount is preferably 20 to 100. In the above manner, the average value of all points is obtained, and a total of 45 points of frame average data is generated.
- Fig. 4 shows the set point decimal value data for 45 points obtained by dividing the frame average value data by the maximum value in the set and converting it to a decimal number.
- each column represents a set name (set1, set2, set3 ...), and each row represents a point (p1, p2, p3, ..., p45).
- an average value is calculated for each point. That is, the average value of the first points p1 is calculated by dividing the number of sets by adding the first point values in all sets.
- the average value of the second points p2 is calculated by adding the second point values in all sets and dividing by the number of sets.
- the representative value data includes the average value for each point in all sets.
- the reason for calculating the ratio to the maximum value in the set is to equalize the ratio in which each set is reflected in the representative value.
- the balance process aims to reduce the deviation of each set of positions.
- the difference between each set is not very important, but the positional differences within the set are important.
- the ratio of the maximum value is calculated.
- the process of calculating the ratio to the maximum value may be omitted, in this case, the position where the capacitance change amount of 500 is detected when the maximum value is 3000 is the same as the position where the capacitance change amount of 500 is detected when the maximum value is 10,000 is the same. Since the average value is calculated, it is difficult to reduce the deviation for each position. In other words, if the ratio to the maximum value is calculated, the positional deviation can be effectively reduced.
- each node means each cell of FIG. 5. That is, when all the cells of FIG. 5 are viewed from the touch sensor panel surface, each node may correspond to the same position.
- the value measured at 45 points is interpolated by node and replaced with the value measured by node. At this time, the data of each point is brought to the node corresponding to the point measured using the pitch of the driving electrode Tx and the receiving electrode Rx.
- 45 points correspond to Y points
- a value corresponding to a node included in area B of FIG. 5 is calculated using Equation 1 below.
- region Y, region B, region G, and region O are shown, where region Y includes a node corresponding to 45 points, region B includes a node existing between nodes of region Y.
- the region G is immediately adjacent to the nodes of the region Y and the region B, the region including the nodes surrounding the region Y and the region B, and the region O includes the remaining nodes located outside the region G.
- X and Y are the values of the X node and the Y node
- x and y are the position of the node
- n is the distance between the node and the X node to calculate the value.
- Equation 2 a value corresponding to a node included in region G of FIG. 5 is calculated.
- X1 means the value of the node one column away from the node to be calculated
- X2 means the value of the node two spaces apart. That is, the value reduced by half of the slope of the previous node and the previous node is determined as the node value.
- the balance process is basically designed to be balanced based on the minimum value.
- the standard of the value to be balanced is determined. In this case, if the maximum value is used as a reference, a value equal to or greater than 1 is multiplied by a value greater than 1, so that a graph as shown in 2 of FIG. If it is based on the values between them, it will appear as a straight line between the graphs of 1 and 2.
- the balance coefficient for each node is finally obtained.
- the range of 0 to 255 for obtaining the balance coefficient for each node may have a different range of values. For example, it may be set in the range of 0-1 or the range of 0-65535. In this regard, the present invention is not limited to a specific range.
- the balance coefficient data of FIG. 8 to be described below is data obtained by multiplying the coefficient A by the inverse of each node value of FIG. 5, and the coefficient A is calculated by taking 8.4.
- the 9 is a graph comparing the sensitivity of each node before the balancing process and the sensitivity of each node after the balancing process.
- the x-axis represents the position (each point or node) on the touch sensor panel, and the y-axis is the capacitance change amount value.
- the graph shown by the dotted line is a graph based on the data before balance
- the graph shown by the solid line is a graph based on the data after balance.
- the balance had different sensitivity at each position of the touch sensor panel, but after balance (solid line), the sensitivity was equal at all positions.
- Calibration can be done simply by multiplication. That is, the calibration may be performed by multiplying the capacitance change value measured at all points of the touch sensor panel by a specific coefficient to uniformly adjust the value. In this case, Equation 3 below is used.
- Z is the capacitance change amount after calibration
- Diffsum is the capacitance change amount before calibration
- Target is a target value
- Center800g diff is the capacitance change amount of the center point (point located in the center of the touch sensor panel) before calibration.
- the target value may be set to a value corresponding to 80% of the capacitance change amount according to the pressure applied with a force of 800 g, but the present invention is not limited thereto. In another embodiment, the target value is set to fall within a different range. Can be. For example, in the case of the AP standard, 52428, which is a value corresponding to 80% of 0 to 65535, may be used as a target value.
- 10 is a graph for explaining such a problem, and shows the amount of change in capacitance according to the weight for each position to which Equation 3 above is applied.
- the x axis represents pressure (pressure according to weight), and the y axis represents capacitance change amount.
- the target value is lower than the capacitance change amount of the set showing the lowest capacitance change amount, which is meaningful.
- the calibration is performed to a value that is too low, and there is a problem of being vulnerable to noise.
- Equation 4 may be used.
- Z is the capacitance change amount after calibration
- Diffsum is the capacitance change amount before calibration
- Target is a target value
- Center800g diff is the capacitance change amount of the center point (point located in the center of the touch sensor panel) before calibration.
- FIG. 11 is a graph to which an additive calibration is applied. As shown in FIG. 11, when the addition-based calibration is used, the graph may be moved closer to the target value while maintaining the slope of the graph.
- the difference between the remaining two points based on the average value of 200 is ⁇ 100. do.
- the calibration used in the present invention is a complementary method to the multiplication method, and proposes a hybrid method that combines the advantages of multiplication and addition.
- Equation 5 may be used.
- Z is the capacitance change amount after calibration
- Diffsum is the capacitance change amount before calibration
- Target is a target value
- Center800g diff is the capacitance change amount of the center point (point located in the center of the touch sensor panel) before calibration.
- FIG. 12 illustrates a case of applying a hybrid calibration using Equation (5). As shown in Fig. 12, when the amount of change in capacitance is less than or equal to the target value, a multiplication calibration is applied, and when it is more than or equal to the target value, an addition calibration is applied.
- 13 is a graph showing a result of performing a hybrid calibration at three location points.
- the Z values after the calibration are 1000, 2000, and 2100, respectively. That is, the difference between the points becomes smaller, and in particular, even for values smaller than the target value, the data of the high pressure (pressure applied to the weight of 800g or more) exceeds 2000, which is the median value, and is switched to the addition method. The difference in capacity change is reduced.
- the difference in position is sensitively sensed when a large force is applied, and the user feels that the sensitivity correction is well performed.
- the target value is smaller than the capacitance change detected at the center point before calibration.
- the target value is set to be larger than the capacitance change amount of the center point, but there may be other cases.
- Equation 14 is a graph to which a hybrid calibration is applied when the target value is smaller than the capacitance change amount of the center point. As shown in FIG. 14, at low pressures (pressures weighing less than 500 g), a dead zone is created. In order to compensate for this, the following Equation 6 may be used in the present invention.
- Z is the capacitance change amount after calibration
- Diffsum is the capacitance change amount before calibration
- Target is a target value
- Center800g diff is the capacitance change amount of the center point (point located in the center of the touch sensor panel) before calibration.
- Equation 7 in consideration of the fact that the force control is different for each person, by setting the offset value so that everyone can feel a similar sensitivity.
- Equation 7 may be used.
- Z is the change in capacitance after calibration
- Diffsum is the change in capacitance before calibration
- Target is the target value
- Center800g diff is the change in capacitance at the center point (point located at the center of touch sensor panel) before calibration
- Offset is the offset to be applied. Indicates a value.
- Equation 7 it is possible to solve the offset problem that may occur in the above-described addition calibration.
- the offset value (Offset) in the equation (7) is assuming that a very weak force is applied, can assume a value of about 5 to 10% of the total. That is, if the displayed pressure value is 0-65535, the value of 3277-6553 which is its 5-10% can be assumed.
- the present invention is not limited to the above values, and in other embodiments, the offset values can be set in different ways.
- the present invention can be implemented in the form of a computer-readable recording medium recording a program for executing each step included in the above-described sensitivity correction method.
- At least one of a balance process and a calibration process may be performed by a program recorded on a recording medium according to an embodiment of the present invention.
- Program instructions recorded on the computer-readable recording medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in the computer software arts.
- Computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, and magneto-optical media such as floptical disks. And hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
- the program instructions may include not only machine code, such as produced by a compiler, but also high-level language code, which may be executed by a computer using an interpreter, and the like.
- the hardware device may be configured to operate as one or more software modules to carry out the process according to the invention, and vice versa.
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Abstract
Description
Claims (17)
- 터치 압력을 감지하는 터치 입력 장치의 감도 보정 방법으로,복수의 세트의 터치 입력 장치에 대하여, 터치 입력 장치에 구비된 터치 센서 패널에 정의된 복수의 포인트에 압력을 인가하여 정전용량 변화량을 검출하는 단계;상기 검출한 정전용량 변화량에 기초하여, 상기 정의된 포인트의 정전용량 변화량에 대한 로우 데이터를, 각 세트마다 생성하는 단계;세트 내의 최대값으로 세트 내의 데이터값을 나누어, 각 세트마다 소수값 데이터를 생성하는 단계;상기 각 세트마다 생성된 소수값 데이터에 기초하여, 상기 정의된 포인트별 평균값을 산출하는 단계;상기 포인트별 평균값에 기초하여, 상기 터치 센서 패널의 전체 포인트에 대응하는 값을 산출하여, 대표값 데이터를 생성하는 단계;상기 대표값 데이터에 기초하여 밸런스 계수를 산출하는 단계; 및상기 밸런스 계수를 이용하여, 상기 터치 입력 장치의 터치 압력 감도를 보정하는 단계;를 포함하는, 감도 보정 방법.
- 제1항에 있어서,상기 로우 데이터를 생성하는 단계는,상기 정의된 복수의 포인트에서 측정된 프레임 데이터 중에서 새츄레이션된 구간에 해당하는 프레임의 평균값을 계산하여, 해당 포인트의 정전용량 변화량으로 결정하는, 감도 보정 방법.
- 제1항에 있어서,상기 대표값 데이터를 산출하는 단계는,상기 정의된 복수의 포인트의 평균값을 기초로, 상기 복수의 포인트 이외의 임의의 포인트에 대해 인터폴레이션함으로써, 상기 임의의 포인트에 대한 평균값을 산출하는, 감도 보정 방법.
- 제1항에 있어서,상기 정의된 복수의 포인트에 인가되는 압력은, 800g 8phi에 의해 가해지는 압력인, 감도 보정 방법.
- 제1항에 있어서,상기 정의된 복수의 포인트는 가로 5개, 세로 9개의 배열을 가지는 45개의 포인트로 구성되는, 감도 보정 방법.
- 제1항에 있어서,상기 밸런스 계수를 산출하는 단계는, 상기 대표값 데이터에 소정의 계수(A)를 곱하여 밸런스 계수를 산출하는, 감도 보정 방법.
- 터치 압력을 감지하는 터치 입력 장치의 감도 보정 방법으로,상기 터치 입력 장치에 인가되는 압력에 따른 정전용량 변화량을 검출하는 단계; 및상기 검출된 정전용량 변화량을 아래의 수식으로 캘리브레이션하는 단계;를 포함하는, 감도 보정 방법.(Z: 해당 포인트의 캘리브레이션 후의 값, Diffsum: 캘리브레이션 전 해당 포인트에서 검출된 정전용량 변화량, Target: 목표값, Center800g diff: 캘리브레이션 전 중심포인트(상기 터치 센서 패널의 중심에 위치하는 포인트)에서 검출된 정전용량 변화량, Offset: 오프셋값)
- 제1항 내지 제16항 중 어느 한 항에 기재된 감도 보정 방법을 실행하는 프로그램을 기록한, 컴퓨터 판독 가능한 기록 매체.
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