WO2014042128A1 - 静電容量値分布検出装置、タッチパネルシステム、および静電容量値分布検出装置の検出方法 - Google Patents
静電容量値分布検出装置、タッチパネルシステム、および静電容量値分布検出装置の検出方法 Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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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
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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
- G06F3/0446—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
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
- G01B2210/58—Wireless transmission of information between a sensor or probe and a control or evaluation unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
Definitions
- the present invention relates to a capacitance value distribution detection device that detects a distribution of a plurality of capacitance values respectively formed at intersections of a plurality of first signal lines and a plurality of second signal lines.
- the capacitive touch panel device can be operated with a user's finger or a mere conductive pen without depending on a special pen, and thus has high convenience.
- the human body when the human body receives electromagnetic noise (fluorescent lamp, switching power supply, electronic device, wireless, etc.), the noise enters the touch panel device via the indicator (finger, conductive pen). In this way, electromagnetic noise received by the human body or the like is mixed with the touch panel device via the indicator and is referred to as “external noise”. If there is external noise, the touch position may be erroneously recognized.
- electromagnetic noise fluorescent lamp, switching power supply, electronic device, wireless, etc.
- the noise enters the touch panel device via the indicator (finger, conductive pen).
- electromagnetic noise received by the human body or the like is mixed with the touch panel device via the indicator and is referred to as “external noise”. If there is external noise, the touch position may be erroneously recognized.
- Some conventional touch panel devices have a system for removing external noise.
- Patent Document 1 describes a capacitive touch panel device that avoids the influence of external noise.
- This touch panel device detects the degree of variation of the level signal output from the receiving unit, and performs sampling at a timing when the degree of variation becomes small.
- the sample timing of the sample hold unit is set or the frequency of the drive signal is set so that the variation degree becomes small. This makes it possible to obtain a stable output signal that is not affected by external noise.
- Patent Document 2 describes a capacitive touch panel device that avoids the influence of external noise. This touch panel device switches to another frequency when the frequency of the external noise matches any one frequency of the drive signal. As a result, the frequency of the voltage signal that is the same as the frequency of the drive signal is made different from the frequency of the external noise. In addition, the external noise is removed by a band-pass filter that cuts a frequency component different from the frequency of the drive signal.
- Patent Document 3 describes a surface acoustic wave type touch panel device. This touch panel device determines whether noise exists from a received signal based on a surface acoustic wave burst wave. If it is determined that noise exists, the detection of an object based on the received signal is not performed.
- Japanese Patent Publication “JP 2011-128858 A” (published on June 30, 2011) Japanese Patent Publication “Japanese Patent Laid-Open No. 2011-128857 (published on June 30, 2011)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2006-268288 (published on October 5, 2006)” Japanese Patent Publication “Japanese Unexamined Patent Publication No. 2012-118957 (published on June 21, 2012)”
- the present invention has been made in view of the present situation, and according to one aspect of the present invention, it is possible to realize a capacitance value distribution detection device capable of determining the presence or absence of external noise.
- a capacitance value distribution detection device detects a distribution of a plurality of capacitance values respectively formed at intersections of a plurality of first signal lines and a plurality of second signal lines.
- the first signal line is driven to output a charge corresponding to the capacitance from the second signal line, and at a second time after the first time, the first signal line is output.
- switching control of the connection of the second signal line, and at a third time after the second time, the second signal line is driven to charge corresponding to the capacitance from the first signal line.
- a capacitance value distribution detection device for output comprising an external noise determination unit that determines the presence or absence of external noise that occurs along the output direction of electric charge corresponding to the capacitance through a touched indicator. It is said.
- a capacitance value distribution detection device detects a distribution of a plurality of capacitance values respectively formed at intersections of a plurality of first signal lines and a plurality of second signal lines.
- the first signal line is driven to output a charge corresponding to the capacitance from the second signal line, and at a second time after the first time, the first signal line is output.
- switching control of the connection of the second signal line, and at a third time after the second time the second signal line is driven to charge corresponding to the capacitance from the first signal line.
- a capacitance value distribution detection device to output, an external noise determination unit for determining the presence or absence of external noise generated along the output direction of electric charge corresponding to the capacitance through the touched first and second indicators And a signal corresponding to the capacitance value exceeds a detection threshold.
- the extraneous noise determination unit includes the superthreshold capacitance number in the first detection region along the first signal line and the second signal. A superthreshold capacitance number in the second detection region along the line, a superthreshold capacitance number in the third detection region along the first signal line, and a fourth along the second signal line.
- the extraneous noise is detected based on the superthreshold capacitance number in the detection region, and the extraneous noise determination unit is configured to detect the superthreshold capacitance number in the second detection region and the first threshold at the first time. And detecting the number of superthreshold capacitances in the first detection region and the number of superthreshold capacitances in the third detection region at the third time. It is characterized by detecting.
- a capacitance value distribution detection device that detects a distribution of capacitance values
- the presence or absence of external noise mixed with electromagnetic noise received by a human body or the like through a pointer is determined. Can do.
- FIG. 1 It is a block diagram which shows the structure of the touch sensor system which concerns on one Embodiment of this invention. It is a schematic diagram which shows the structure of the touchscreen provided in the touch sensor system which concerns on one Embodiment of this invention. It is a circuit diagram showing a schematic structure of a multiplexer concerning one embodiment of the present invention. It is a circuit diagram which shows an example of a specific structure of the connection switching part which concerns on one Embodiment of this invention. (A) is a figure which shows intensity distribution of a sense signal when a vertical signal line is connected to a drive line and a horizontal signal line is connected to a sense line, and (b) is a horizontal signal line.
- FIG. 1 is a figure which shows the area
- (b) shows the area
- FIG. It is a figure which shows the flow of the noise detection which concerns on one Embodiment of this invention. In noise detection concerning one embodiment of the present invention, it is a graph which shows an example of a value of noise index NoiseMetric in a plurality of times of noise judgment processing when it ends normally.
- noise detection concerning one embodiment of the present invention, it is a graph which shows an example of a value of noise index NoiseMetric in a plurality of times of noise judgment processing at the time of carrying out conditional termination. It is a figure for demonstrating each parameter in the noise detection which concerns on one Embodiment of this invention. It is a figure which shows the specific example of intensity distribution of the sense signal measured in the 1st connection state of the said embodiment.
- FIG. 12 is a diagram corresponding to FIG. 11 and showing a specific example of an intensity distribution of a sense signal measured in the second connection state of the embodiment. It is a figure which shows another specific example of the intensity distribution of the sense signal measured in the 1st connection state of the said embodiment.
- FIG. 14 is a diagram corresponding to FIG.
- FIG. 13 shows another specific example of the sense signal intensity distribution measured in the second connection state of the embodiment. It is a figure which shows another specific example of the intensity distribution of the sense signal measured in the 1st connection state of the said embodiment.
- FIG. 16 is a view corresponding to FIG. 15 and showing another specific example of the intensity distribution of the sense signal measured in the second connection state of the embodiment.
- (A) is a figure which shows the condition in 1st time (1st frame) in case the indicator is moving at high speed
- (b) is a figure which shows the condition in 5th time (3rd frame). It is.
- (A) is a figure which shows the condition in the 3rd time (2nd frame) in case the indicator is moving at high speed
- (b) is a figure which shows the condition in the 7th time (4th frame). It is. It is a figure which shows the flow of the noise detection which concerns on another embodiment of this invention. It is a figure which shows the specific example of intensity distribution of the sense signal measured in the 1st flame
- FIG. 1 is a block diagram illustrating a configuration of a touch sensor system 1 (touch panel device) according to the present embodiment.
- FIG. 2 is a schematic diagram illustrating a configuration of the touch panel 3 provided in the touch sensor system 1.
- the touch sensor system 1 includes a touch panel 3 and a capacitance value distribution detection circuit 2 (capacitance value distribution detection device).
- the touch panel 3 extends along the horizontal direction (lateral direction) and is arranged in parallel to the horizontal signal lines HL1 to HLM (second signal lines) arranged in parallel to each other, and extends along the vertical direction (vertical direction).
- Vertical signal lines VL1 to VLM first signal lines
- Capacitances C11 to CMM are formed at the intersections of the horizontal signal lines HL1 to HLM and the vertical signal lines VL1 to VLM, respectively.
- the capacitance value distribution detection circuit 2 includes a multiplexer 4, a drive unit 5, a sense signal processing unit 6, an operation control unit 7 (external noise removal reduction unit), a noise detection unit 8 (external noise determination unit), and a touch position detection unit. 9 and a parameter storage unit 10.
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM in time series.
- the touch panel 3 outputs charges corresponding to the capacitance value from the sense lines SL1 to SLM.
- the sense signal processing unit 6 receives a sense signal corresponding to the drive signal and the capacitance supplied to the touch panel 3 via the sense lines SL1 to SLM.
- the sense signal processing unit 6 receives a sense signal corresponding to the value of capacitance at each intersection of the horizontal signal lines HL1 to HLM and the vertical signal lines VL1 to VLM.
- the distribution of the intensity of the received sense signal is a signal corresponding to the distribution of the capacitance value on the touch panel 3.
- the sense signal processing unit 6 outputs the intensity distribution of the sense signal to the noise detection unit 8.
- FIG. 3 is a circuit diagram showing a schematic configuration of the multiplexer 4.
- the multiplexer 4 includes M connection switching units 11 connected in cascade.
- a control line CL from the operation control unit 7 is input to the first connection switching unit 11.
- the multiplexer 4 switches between the first connection state (first operation mode) and the second connection state (second operation mode) in accordance with a control signal input from the operation control unit 7 via the control line CL.
- the vertical signal lines VL1 to VLM are connected to the drive lines DL1 to DLM of the drive unit 5, respectively
- the horizontal signal lines HL1 to HLM are connected to the sense lines SL1 to SLM of the sense signal processing unit 6, respectively. .
- the vertical signal lines VL1 to VLM are connected to the sense lines SL1 to SLM of the sense signal processing unit 6, respectively, and the horizontal signal lines HL1 to HLM are connected to the drive lines DL1 to DLM of the drive unit 5, respectively.
- FIG. 4 is a circuit diagram showing an example of a specific configuration of the connection switching unit 11.
- the connection switching unit 11 has four CMOS switches SW1 to SW4.
- the control line CL of the connection switching unit 11 is connected to the control line CL of the preceding connection switching unit 11 and the control line CL of the subsequent connection switching unit 11. That is, the control line CL from the operation control unit 7 is shared by each connection switching unit 11.
- the control line CL controls the control terminal of the p-type transistor of the CMOS switch SW1, the control terminal of the n-type transistor of the CMOS switch SW2, the control terminal of the p-type transistor of the CMOS switch SW3, and the control terminal of the n-type transistor of the CMOS switch SW4. It is connected to the terminal and the input of the inverter inv.
- the output of the inverter inv is the control terminal of the n-type transistor of the CMOS switch SW1, the control terminal of the p-type transistor of the CMOS switch SW2, the control terminal of the n-type transistor of the CMOS switch SW3, and the p-type transistor of the CMOS switch SW4. Connected to the control terminal.
- the horizontal signal line HLk is connected to one end of the CMOS switches SW1 and SW2.
- the vertical signal line VLk is connected to one end of the CMOS switches SW3 and SW4.
- the drive line DLk is connected to the other ends of the CMOS switches SW1 and SW4.
- the sense line SLk is connected to the other ends of the CMOS switches SW2 and SW3.
- HLk indicates the k-th (1 ⁇ k ⁇ M) horizontal signal line.
- the horizontal signal lines HL1 to HLM are connected to the sense lines SL1 to SLM, and the vertical signal lines VL1 to VLM are connected to the drive lines DL1 to DLM, respectively (first connection state).
- the control signal of the control line CL is set to Low, the horizontal signal lines HL1 to HLM are connected to the drive lines DL1 to DLM, respectively, and the vertical signal lines VL1 to VLM are connected to the sense lines SL1 to SLM, respectively (second connection state). .
- the operation control unit 7 supplies the multiplexer 4 with a control signal that instructs the connection state.
- the operation control unit 7 generates signals that define the operations of the drive unit 5 and the sense signal processing unit 6, and supplies the signals to the drive unit 5 and the sense signal processing unit 6.
- the noise detection unit 8 determines the presence or absence of external noise from the intensity distribution of the sense signal. Detailed processing of the noise detection unit 8 will be described later.
- the noise detection unit 8 outputs the determination result of the presence / absence of external noise and the intensity distribution of the sense signal to the touch position detection unit 9.
- electromagnetic noise received by a human body or the like is mixed with the touch sensor system via an indicator and is referred to as “external noise”.
- the touch position detection unit 9 identifies the position where the indicator is touching from the intensity distribution of the sense signal.
- the parameter storage unit 10 stores predetermined parameters used for determining the presence or absence of noise or the touch position.
- the parameter is read by the noise detection unit 8 and the touch position detection unit 9.
- FIG. 5A shows the intensity distribution of the sense signal when the vertical signal line is connected to the drive line and the horizontal signal line is connected to the sense line.
- the height in the graph indicates the intensity of the sense signal.
- the intensity of a sense signal obtained from a certain horizontal signal line (sense line) when a drive signal is supplied to a certain vertical signal line (drive line) is plotted at the intersection of the vertical signal line and the horizontal signal line.
- the center peak in FIG. 5A is a sense signal resulting from touch.
- a small peak is detected in addition to the touched position.
- This small peak is a sense signal caused by external noise, and a plurality of small peaks appear on the touched sense line.
- FIG. 5B shows the intensity distribution of the sense signal when the horizontal signal line is connected to the drive line and the vertical signal line is connected to the sense line. Also in this case, the peak of the sense signal due to the external noise appears on the touched sense line.
- noise includes noise generated by high-speed movement of the indicator on the touch panel, in addition to external noise in which electromagnetic noise received by the human body or the like is mixed into the touch panel device via the indicator.
- noise caused by the indicator moving at high speed on the touch panel is referred to as “phantom noise”.
- phantom noise When the indicator is moving at high speed, a plurality of peaks of sense signals due to phantom noise appear on the sense line touched by the indicator. Even when phantom noise is present, a sense signal intensity distribution as shown in FIGS. 5A and 5B is obtained.
- the touched position can be specified by comparing the intensity of the sense signal with the threshold value.
- the threshold value is increased too much in order not to erroneously detect external noise, the sensitivity for detecting a touch is lowered.
- the capacitance value distribution detection circuit 2 of the present embodiment uses the property that the external noise appears on the touched sense line.
- the capacitance value distribution detection circuit 2 detects the presence of external noise using the intensity distribution of the sense signal obtained in the first connection state and the intensity distribution of the sense signal obtained in the second connection state.
- FIG. 6 is a figure which shows the area
- FIG. 6B is a diagram illustrating a region touched in the second connection state and a region where noise is generated.
- the direction in which the vertical signal lines extend is the x direction
- the direction in which the horizontal signal lines extend is the y direction.
- the first connection state FIG. 6A
- the external noise appears in the sense signal of the sense line (horizontal signal line) passing through the area A. Therefore, external noise appears in the sense signal in the region B on the sense line (horizontal signal line) passing through the region A.
- the number of intersections (capacitance number) where the signal strength exceeds the signal threshold in the first connection state is counted, and is set as b. This is considered to represent the number of intersections where the signal intensity exceeds the signal threshold in the region B (second detection region).
- the number of intersections where the signal intensity exceeds the signal threshold is defined as the superthreshold capacitance number.
- the number of intersections where the signal strength exceeds the signal threshold in the second connection state is counted and is set as c.
- a noise index is obtained by subtracting twice the number of intersections a in the region A from the sum of b and c.
- the number of intersections a in the region A is defined as the touch-capable capacitance number. If the noise index (b + c ⁇ 2 ⁇ a) is greater than zero (0), it is considered that there is an intersection having a signal intensity that exceeds the signal threshold at a position other than the touched region A. That is, if the noise index (b + c ⁇ 2 ⁇ a) is greater than 0, it is considered that external noise exists. If the noise index (b + c ⁇ 2 ⁇ a) is 0 or less, it is considered that no external noise exists.
- FIG. 7 is a diagram illustrating a flow of noise detection according to the present embodiment.
- the operation control unit 7 outputs a control signal to the multiplexer 4 via the control line CL, and switches the multiplexer 4 to the first connection state (ST1).
- the vertical signal lines VL1 to VLM are connected to the drive lines DL1 to DLM of the drive unit 5, respectively, and the horizontal signal lines HL1 to HLM are connected to the sense lines SL1 to SLM of the sense signal processing unit 6, respectively. .
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM. Further, the sense signal processing unit 6 receives a sense signal via the sense lines SL1 to SLM (ST2).
- the sense signal is a signal corresponding to the capacitance value at the intersection.
- the noise detection unit 8 reads predetermined parameters (external parameters) NoiseTh and FingerWidthwithMargin from the parameter storage unit 10.
- NoiseTh is a signal threshold (detection threshold) for detecting the touched position and noise. That is, when the signal intensity at a certain intersection exceeds NoiseTh, it is considered that the intersection may be touched by the indicator. However, there may be a case where the signal intensity exceeds the signal threshold value NoiseTh due to external noise or the like.
- FingerWidth with Margin indicates the upper limit (first threshold value, second threshold value) of the vertical or horizontal width (number of intersections) of the touched area when the assumed indicator touches the touch panel 3.
- FingerWidthwithMargin may be different in the vertical direction and the horizontal direction.
- the spread in the vertical direction and the spread in the horizontal direction at a plurality of intersections where the signal intensity exceeds the signal threshold NoiseTh is considered to be within the upper limit value FingerWidthwithMargin. It is done. That is, when there is no external noise, it can be assumed that the width in the vertical direction and the width in the horizontal direction of region A in FIG. 6 are within the upper limit value FingerWidthwithMargin.
- the noise detection unit 8 obtains parameters NoiseIndicator (i), NoisesyLineSet (first), NumNoisyLine (first), and NumNoise (first) in the first connection state from the obtained intensity distribution of the sense signal (ST3).
- the noise detection unit 8 obtains, for each sense line, the number of intersections (capacitance) having a signal intensity (signal absolute value) exceeding the signal threshold value NoiseTh as NoiseIndicator (i).
- NoiseIndicator (i) is a variable representing the number of intersections (superthreshold capacitance number) having a signal intensity (signal absolute value) exceeding the signal threshold value NoiseTh on the i-th sense line.
- noisyLineSet (first) is a set of sense lines that satisfy the relationship NoiseIndicator (i)> FingerWidthwithMargin in the first connection state.
- NoiseIndicator (i)> FingerWidthwithMargin in the first connection state can be defined as an array including 3, 4, 5, and 6 as elements.
- NumNoisyLine (first) is a variable indicating the number of elements of the set NoisyLineSet (first) in the first connection state. That is, NumNoisyLine (first) indicates the number of sense lines (second line number) that satisfies the relationship NoiseIndicator (i)> FingerWidthwithMargin.
- NumNoise (first) is a variable indicating the sum of NoiseIndicator (i) for the sense lines included in noisysyLineSet (first) in the first connection state. That is, the total (second total) of NoiseIndicator (i) of the sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidthwithMargin is NumNoise (first).
- the operation control unit 7 outputs a control signal to the multiplexer 4 via the control line CL, and switches the multiplexer 4 to the second connection state (ST4).
- the vertical signal lines VL1 to VLM are connected to the sense lines SL1 to SLM of the sense signal processing unit 6, respectively, and the horizontal signal lines HL1 to HLM are connected to the drive lines DL1 to DLM of the drive unit 5, respectively. .
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM. Further, the sense signal processing unit 6 receives a sense signal via the sense lines SL1 to SLM (ST5).
- the noise detection unit 8 obtains parameters NoiseIndicator (i), NoisesyLineSet (second), NumNoisyLine (second), and NumNoise (second) in the second connection state from the obtained intensity distribution of the sense signal (ST6).
- noisyLineSet (second) is a set of sense lines that satisfy the relationship NoiseIndicator (i)> FingerWidth with Margin in the second connection state.
- NumNoisyLine (second) is a variable indicating the number of elements of the set NoisyLineSet (second) in the second connection state. That is, NumNoisyLine (second) indicates the number of sense lines (first line number) that satisfies the relationship of NoiseIndicator (i)> FingerWidth with Margin.
- NumNoise (second) is a variable indicating the sum of NoiseIndicator (i) for the sense lines included in noisysyLineSet (second) in the second connection state. That is, the total (first total) of NoiseIndicator (i) of the sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidthwithMargin is NumNoise (second).
- the noise detection unit 8 obtains the following noise index NoiseMetric from the first connection state parameter and the second connection state parameter.
- NoiseMetric NumNoise (first) + NumNoise (second) -2 x NumNoisyLine (first) x NumNoisyLine (second) It is considered that the noise index NoiseMetric increases as the external noise increases. If NoiseMetric> 0 (Yes in ST7), the noise detector 8 determines that there is external noise.
- the noise detection unit 8 determines that there is no external noise, and notifies the touch position detection unit 9 of the determination result.
- the touch position detection unit 9 specifies the position touched by the indicator based on the intensity distribution of the sense signal in the first connection state and / or the second connection state (ST8).
- the noise detection unit 8 determines that noise exists. And the noise detection part 8 determines whether the noise determination process of ST1 to ST7 was performed more than predetermined times. The noise detection unit 8 accumulates (stores) the noise index NoiseMetric and the corresponding signal intensity distribution.
- the noise detection unit 8 touches the intensity distribution of the sense signal when NoiseMetric is the smallest among the multiple noise determination processes. Output to the position detector 9.
- the touch position detection unit 9 specifies the position touched by the indicator based on the received intensity distribution of the sense signal (ST8).
- the noise detection unit 8 (notification unit) may notify the presence or absence of external noise to the touch position detection unit 9 or to a device (host device) that uses the touch sensor system 1.
- the noise detection unit 8 determines that there is external noise and outputs an instruction to perform noise removal to the operation control unit 7. .
- the operation control unit 7 changes the operation condition in order to remove noise (ST10). For example, the frequency of the drive signal is changed to remove noise. Other noise removing means can also be applied.
- the capacitance value distribution detection circuit 2 repeats the noise determination processing of ST1 to ST7 under the changed operating condition.
- the noise detection unit 8 notifies the host of a warning indicating the presence of external noise, and the touch position detection unit 9 identifies the position touched by the indicator. May be.
- This warning may include a NoiseMetric value. Since the influence of external noise is considered to be smaller as NoiseMetric is smaller, the host can recognize the amount (intensity) of the influence of external noise.
- FIG. 8 is a graph showing an example of the value of the noise index NoiseMetric in a plurality of times of noise determination processing at the normal end.
- the noise index NoiseMetric is set to 0 in the fourth process by changing the noise removal operation condition.
- the noise detection unit 8 employs the intensity distribution of the sense signal in the fourth process for detecting the touch position.
- FIG. 9 is a graph showing an example of the value of the noise index NoiseMetric in a plurality of noise determination processes when conditional termination is performed.
- the noise index NoiseMetric does not become 0 even if the noise removal operation condition is changed, and the noise determination processing has reached the predetermined number of times (six times), so the processing ends.
- the noise detection unit 8 employs the intensity distribution of the sense signal when the noise index NoiseMetric is minimum (fourth time) for detection of the touch position. Thereafter, the operation control unit 7 can perform noise removal under the fourth operation condition in which the noise index NoiseMetric is minimized.
- the capacitance value distribution detection circuit 2 can detect the presence of external noise and can perform noise removal processing when the external noise exists. Further, as a result of removing the noise, the capacitance value distribution detection circuit 2 can determine whether the external noise has been removed or whether the external noise still remains. The capacitance value distribution detection circuit 2 can quantitatively determine the magnitude of the external noise included in the signal as a noise index NoiseMetric. Therefore, it is possible to select an optimal noise removal process so that external noise is minimized.
- FIG. 10 is a diagram for explaining each parameter.
- FIG. 10A is a graph showing the intensity distribution of the sense signal at each intersection
- FIG. 10B is a graph showing the intensity distribution in the i-th sense line.
- NoiseTh is a signal strength threshold. The number of intersections where the signal strength (signal absolute value) exceeds NoiseTh is NoiseIndicator (i).
- a set of sense lines whose NoiseIndicator (i) exceeds FingerWidthwithMargin is noisysyLineSet.
- ⁇ Ai, Aj, Ak ⁇ represents the i-th to k-th sense lines. The number of sense lines where NoiseIndicator (i) exceeds FingerWidthwithMargin is NumNoisyLine.
- FIG. 11 is a diagram illustrating a specific example of the intensity distribution of the sense signal measured in the first connection state.
- FIG. 12 is a diagram corresponding to FIG. 11 and illustrating a specific example of the intensity distribution of the sense signal measured in the second connection state.
- the signal threshold NoiseTh is 100
- FingerWidthwithMargin is 7.
- the vertical signal line is a drive line
- the horizontal signal line is a sense line
- S0 to S10 indicate sense line numbers
- D0 to D20 indicate drive line numbers.
- the horizontal signal line is a drive line
- the vertical signal line is a sense line.
- S0 to S20 indicate sense line numbers
- D0 to D10 indicate drive line numbers.
- the noise index NoiseMetric 0. Since the noise index NoiseMetric does not exceed 0, in the case shown in FIGS. 11 and 12, the noise detection unit 8 determines that there is no external noise.
- FIG. 13 is a diagram showing a specific example of the intensity distribution of the sense signal measured in the first connection state.
- FIG. 14 corresponds to FIG. 13 and shows a specific example of the intensity distribution of the sense signal measured in the second connection state.
- the signal threshold NoiseTh is 100
- FingerWidthwithMargin is 7.
- the vertical signal line is a drive line
- the horizontal signal line is a sense line.
- NumNoisyLine (first) 4.
- the horizontal signal line is a drive line
- the vertical signal line is a sense line.
- NumNoisyLine (second) 2.
- FIG. 15 is a diagram illustrating a specific example of the intensity distribution of the sense signal measured in the first connection state.
- FIG. 16 corresponds to FIG. 15 and is a diagram illustrating a specific example of the intensity distribution of the sense signal measured in the second connection state.
- the signal threshold NoiseTh is 100
- FingerWidthwithMargin is 7.
- the vertical signal line is a drive line
- the horizontal signal line is a drive line
- the vertical signal line is a sense line.
- the operation control unit 7 may have a subsystem (external noise removal reduction unit) for removing external noise.
- a subsystem external noise removal reduction unit
- a method of removing or reducing various external noises can be considered.
- the operation control unit 7 includes a subsystem in which an execution unit for adding and averaging a plurality of linear sum signals based on the same phase drive in the same vector drive is a frame unit, a subsystem in which the execution unit to be averaged is a vector unit, and It has a subsystem whose phase unit is the execution unit to be averaged.
- the operation control unit 7 may be configured to select these subsystems so as to reduce the external noise based on the frequency characteristic between the normalized frequency and the amplitude change rate.
- a subsystem having a function of inverting the sign of the drive signal may be provided in the operation control unit 7.
- a subsystem having a drive reversal period of 2 phase units is provided in the operation control unit 7 and the subsystem is selected to reduce external noise based on the frequency characteristics. It is good also as composition to do.
- a subsystem for shortening the reset time of the reset signal for resetting the amplifier circuit may be provided.
- the presence or absence of phantom noise caused by the indicator moving at high speed on the touch panel is determined. As shown in FIG. 25, when the indicator (finger) moves at high speed while touching the touch panel 3, phantom noise appears in the sense signal of the sense line touched by the indicator.
- the noise detection unit 8 of the touch sensor system 1 also determines the presence or absence of phantom noise when the phantom noise detection switch is ON. Information about whether the phantom noise detection switch is ON or OFF can be stored in, for example, the parameter storage unit 10. In the first embodiment, the case where the phantom noise detection switch is OFF has been described. Since the configuration of the touch sensor system 1 is the same as that of the first embodiment, detailed description thereof is omitted.
- the touch sensor system 1 measures the capacitance at each intersection twice in the first connection state and twice in the second connection state.
- FIG. 17 and FIG. 18 are diagrams showing a situation where the indicator touching the touch panel is moving at high speed from the first frame to the fourth frame. Under such circumstances, phantom noise occurs on the sense line touched by the indicator regardless of the direction in which the indicator moves. An area touched by the moving indicator is indicated by D. Here, the indicator moves at a high speed in the downward direction along the vertical signal line VL3.
- FIG. 17 is a figure which shows the condition in 1st time (1st frame).
- the touch sensor system 1 In the first frame, the touch sensor system 1 is in the first connection state.
- a drive signal is supplied from the vertical signal line VL, and a sense signal is output from the horizontal signal line HL.
- the indicator In the first frame, the indicator is on the horizontal signal lines HL6 and HL7 which are sense lines.
- the peak position of the signal intensity due to the touch is on the horizontal signal lines HL6 and HL7. Therefore, phantom noise appears in the sense signals of the horizontal signal lines HL6 and HL7.
- the touch sensor system 1 is switched from the first connection state to the second connection state.
- FIG. 18 is a figure which shows the condition in 3rd time (2nd frame).
- the touch sensor system 1 In the second frame, the touch sensor system 1 is in the second connection state.
- a drive signal is supplied from the horizontal signal line HL, and a sense signal is output from the vertical signal line VL.
- the indicator In the second frame, the indicator is on the vertical signal line VL3 which is a sense line.
- the peak position of the signal intensity due to the touch is on the vertical signal line VL3. Therefore, phantom noise appears in the sense signal of the vertical signal line VL3.
- the touch sensor system 1 is switched from the second connection state to the first connection state.
- FIG. 17 is a figure which shows the condition in the 5th time (3rd frame).
- the touch sensor system 1 is in the first connection state.
- a drive signal is supplied from the vertical signal line VL, and a sense signal is output from the horizontal signal line HL.
- the indicator is on the horizontal signal lines HL8 and HL9 which are sense lines.
- the peak position of the signal intensity due to the touch is on the horizontal signal lines HL8 and HL9. Therefore, phantom noise appears in the sense signals of the horizontal signal lines HL8 and HL9. Since the indicator moves during the passage of time, the signal line in which phantom noise appears is different between the first frame and the third frame.
- the touch sensor system 1 is switched from the first connection state to the second connection state.
- FIG. 18 is a figure which shows the condition in the 7th time (4th frame).
- the touch sensor system 1 is in the second connection state.
- a drive signal is supplied from the horizontal signal line HL, and a sense signal is output from the vertical signal line VL.
- the indicator is on the vertical signal line VL3 which is a sense line.
- the peak position of the signal intensity due to the touch is on the vertical signal line VL3. Therefore, phantom noise appears in the sense signal of the vertical signal line VL3.
- the noise is phantom noise. Can be determined. Further, when the moving direction of the indicator is along the horizontal signal line, noise is generated by comparing the sense lines in which noise is generated between the second frame and the fourth frame in the second connection state. It can be detected that the sense line is shifted.
- FIG. 19 is a diagram illustrating a flow of noise detection according to the present embodiment.
- the touch sensor system 1 determines the presence or absence of both phantom noise and external noise.
- the operation control unit 7 outputs a control signal to the multiplexer 4 via the control line CL, and switches the multiplexer 4 to the first connection state (ST21).
- the vertical signal lines VL1 to VLM are connected to the drive lines DL1 to DLM of the drive unit 5, respectively, and the horizontal signal lines HL1 to HLM are connected to the sense lines SL1 to SLM of the sense signal processing unit 6, respectively. .
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM.
- the sense signal processing unit 6 receives a sense signal via the sense lines SL1 to SLM.
- the noise detection unit 8 reads predetermined parameters (external parameters) NoiseTh and FingerWidthwithMargin from the parameter storage unit 10. Further, the noise detection unit 8 calculates parameters NoiseIndicator (i), NoisesyLineSet (first), NumNoisyLine (first), and NumNoise (first) in the first frame (first connection state) from the obtained intensity distribution of the sense signal. Obtained (ST22).
- NoiseIndicator (i) is a variable representing the number of intersections having a signal intensity (signal absolute value) exceeding the signal threshold NoiseTh on the i-th sense line in the first frame.
- noisyLineSet (first) is a set of sense lines that satisfy the relationship of NoiseIndicator (i)> FingerWidthwithMargin in the first frame. Since extraneous noise and phantom noise occur in the sense line at the position touched by the indicator, the sense line corresponding to the peak position of the signal intensity due to the touch in the first frame is included in the set NoisyLineSet (first). Conceivable.
- NumNoisyLine (first) is a variable indicating the number of elements of the set NoisyLineSet (first) in the first frame. That is, NumNoisyLine (first) indicates the number of sense lines that satisfy the relationship NoiseIndicator (i)> FingerWidthwithMargin.
- NumNoise (first) is a variable indicating the sum of NoiseIndicator (i) for the sense lines included in noisysyLineSet (first) in the first frame. That is, the sum of NoiseIndicator (i) of the sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidthwithMargin is NumNoise (first).
- the operation control unit 7 outputs a control signal to the multiplexer 4 via the control line CL, and switches the multiplexer 4 to the second connection state (ST23).
- the vertical signal lines VL1 to VLM are connected to the sense lines SL1 to SLM of the sense signal processing unit 6, respectively, and the horizontal signal lines HL1 to HLM are connected to the drive lines DL1 to DLM of the drive unit 5, respectively. .
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM. Further, the sense signal processing unit 6 receives a sense signal via the sense lines SL1 to SLM.
- the noise detector 8 obtains parameters NoiseIndicator (i), NoisesyLineSet (second), NumNoisyLine (second), and NumNoise (second) in the second frame (second connection state) from the obtained intensity distribution of the sense signal ( ST24).
- NoiseIndicator (i) is a variable representing the number of intersections having a signal intensity (signal absolute value) exceeding the signal threshold NoiseTh on the i-th sense line in the second frame.
- noisyLineSet (second) is a set of sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidth with Margin in the second frame.
- the sense line corresponding to the peak position of the signal intensity due to the touch in the second frame is considered to be included in the set NoisyLineSet (second).
- NumNoisyLine (second) is a variable indicating the number of elements of the set NoisyLineSet (second) in the second frame. That is, NumNoisyLine (second) indicates the number of sense lines that satisfy the relationship NoiseIndicator (i)> FingerWidthwithMargin.
- NumNoise (second) is a variable indicating the sum of NoiseIndicator (i) for the sense lines included in noisysyLineSet (second) in the second frame. That is, the sum of NoiseIndicator (i) of the sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidthwithMargin is NumNoise (second).
- the operation control unit 7 outputs a control signal to the multiplexer 4 via the control line CL, and switches the multiplexer 4 to the first connection state (ST25).
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM.
- the sense signal processing unit 6 receives a sense signal via the sense lines SL1 to SLM.
- the noise detection unit 8 calculates parameters NoiseIndicator (i), NoisesyLineSet (third), NumNoisyLine (third), and NumNoise (third) in the third frame (first connection state) from the obtained intensity distribution of the sense signal. Obtained (ST26).
- NoiseIndicator (i) is a variable representing the number of intersections having a signal intensity (signal absolute value) exceeding the signal threshold NoiseTh on the i-th sense line in the third frame.
- noisyLineSet (third) is a set of sense lines that satisfy the relationship of NoiseIndicator (i)> FingerWidth with Margin in the third frame.
- the sense line corresponding to the peak position of the signal intensity due to the touch in the third frame is considered to be included in the set NoisyLineSet (third).
- NumNoisyLine (third) is a variable indicating the number of elements of the set NoisyLineSet (third) in the third frame. That is, NumNoisyLine (third) indicates the number of sense lines that satisfy the relationship NoiseIndicator (i)> FingerWidthwithMargin.
- NumNoise (third) is a variable indicating the sum of NoiseIndicator (i) for the sense lines included in noisysyLineSet (third) in the third frame. That is, the sum of NoiseIndicator (i) of the sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidthwithMargin is NumNoise (third).
- the operation control unit 7 outputs a control signal to the multiplexer 4 via the control line CL, and switches the multiplexer 4 to the second connection state (ST27).
- the drive unit 5 supplies drive signals to the drive lines DL1 to DLM. Further, the sense signal processing unit 6 receives a sense signal via the sense lines SL1 to SLM.
- the noise detector 8 obtains parameters NoiseIndicator (i), NoisesyLineSet (fourth), NumNoisyLine (fourth), and NumNoise (fourth) in the fourth frame (second connection state) from the obtained intensity distribution of the sense signal ( ST28).
- NoiseIndicator (i) is a variable representing the number of intersections having a signal intensity (signal absolute value) exceeding the signal threshold NoiseTh on the i-th sense line in the fourth frame.
- noisyLineSet (fourth) is a set of sense lines that satisfy the relationship of NoiseIndicator (i)> FingerWidth with Margin in the fourth frame.
- the sense line corresponding to the peak position of the signal intensity due to the touch in the fourth frame is considered to be included in the set noisysyLineSet (fourth).
- NumNoisyLine (fourth) is a variable indicating the number of elements of the set NoisyLineSet (fourth) in the fourth frame. That is, NumNoisyLine (fourth) indicates the number of sense lines that satisfy the relationship NoiseIndicator (i)> FingerWidthwithMargin.
- NumNoise (fourth) is a variable indicating the sum of NoiseIndicator (i) for the sense lines included in noisysyLineSet (fourth) in the fourth frame. That is, the sum of NoiseIndicator (i) of the sense lines satisfying the relationship of NoiseIndicator (i)> FingerWidthwithMargin is NumNoise (fourth).
- the noise detection unit 8 reads a predetermined parameter (external parameter) MoveTh from the parameter storage unit 10.
- MoveTh is a threshold for the shift amount of the sense line.
- the noise detection unit 8 compares noisysyLineSet (first) of the first frame in the first connection state with noisysyLineSet (third) of the third frame in the first connection state. By this comparison, the noise detection unit 8 obtains the shift amount of the sense line that is considered to cause noise between the first frame and the third frame. Similarly, the noise detection unit 8 compares NoisyLineSet (second) of the second frame in the second connection state with noisysyLineSet (fourth) of the fourth frame in the second connection state. By this comparison, the noise detection unit 8 obtains the shift amount of the sense line considered that noise appears between the second frame and the fourth frame (ST29).
- the set noisysyLineSet stores sense lines whose intersection having a signal intensity (signal absolute value) exceeding the signal threshold NoiseTh exceeds the threshold FingerWidthwithMargin. That is, the sense lines included in the set NoisyLineSet include many intersections with high signal strength. The sense lines included in the set NoisyLineSet are sense lines that are highly likely to generate noise.
- the noise detection unit 8 determines that the shift amount between the first frame and the third frame exceeds the threshold value MoveTh, or the shift amount between the second frame and the fourth frame is a threshold value. If MoveTh is exceeded (Yes in ST30), it is determined that phantom noise exists. In this case, the noise detection unit 8 notifies the host device that phantom noise exists (ST31), and ends the process. In this case, in order to avoid generation
- the noise detection unit 8 has a shift amount between the first frame and the third frame equal to or less than the threshold MoveTh, and a shift amount between the second frame and the fourth frame is equal to or less than the threshold MoveTh (in ST30). No), determination processing of external noise after ST32.
- the noise detection unit 8 obtains a noise index NoiseMetric from the first connection state parameter and the second connection state parameter. At this time, the noise detection unit 8 obtains the first noise index NoiseMetric from the parameters of the first frame and the second frame, obtains the second noise index NoiseMetric from the parameters of the second frame and the third frame, A third noise index NoiseMetric is obtained from the parameters of the three frames and the parameters of the fourth frame (ST32). Since two consecutive frames have different connection states, the noise detection unit 8 can obtain a plurality of noise indexes.
- the noise detection unit 8 determines that there is external noise when NoiseMetric> 0 for any NoiseMetric (Yes in ST33).
- the noise detection unit 8 determines that there is no external noise, and notifies the touch position detection unit 9 of the determination result.
- the touch position detection unit 9 specifies the position touched by the indicator based on the intensity distribution of the sense signal of any frame (ST34).
- the noise detection unit 8 determines that noise exists. And the noise detection part 8 determines whether the noise determination process from ST21 was performed more than predetermined times. The noise detection unit 8 accumulates (stores) the noise index NoiseMetric and the corresponding signal intensity distribution.
- the noise detection unit 8 uses the touch signal to calculate the intensity distribution of the sense signal when NoiseMetric is the smallest among the plurality of noise determination processes. Output to the detector 9. When the value of NoiseMetric is small, the influence of external noise is considered to be small. Then, the touch position detection unit 9 specifies the position touched by the indicator based on the received intensity distribution of the sense signal (ST34).
- the noise detection unit 8 determines that there is external noise and outputs an instruction to perform noise removal to the operation control unit 7.
- the operation control unit 7 changes the operation condition in order to remove noise (ST36). For example, the frequency of the drive signal is changed to remove noise. Other noise removing means can also be applied.
- the capacitance value distribution detection circuit 2 repeats the noise determination process from ST21 under the changed operating condition.
- the noise detection unit 8 notifies the host of a warning indicating the presence of external noise, and then the touch position detection unit 9 is touched by the indicator.
- the position may be specified.
- This warning may include a NoiseMetric value. Since the influence of external noise is considered to be smaller as NoiseMetric is smaller, the host can recognize the amount (intensity) of the influence of external noise.
- the noise detection unit 8 may obtain only one noise index NoiseMetric between two frames and use it for the external noise determination process.
- the capacitance value distribution detection circuit 2 can determine the presence or absence of phantom noise. Further, the capacitance value distribution detection circuit 2 can distinguish between external noise and phantom noise having different causes. Therefore, the capacitance value distribution detection circuit 2 can perform appropriate processing (noise removal processing or the like) depending on whether the noise is external noise or phantom noise.
- FIG. 20 is a diagram showing a specific example of the intensity distribution of the sense signal measured in the first frame (first connection state).
- FIG. 21 is a diagram illustrating a specific example of the intensity distribution of the sense signal measured in the second frame (second connection state).
- FIG. 22 is a diagram illustrating a specific example of the intensity distribution of the sense signal measured in the third frame (first connection state).
- FIG. 23 is a diagram illustrating a specific example of the intensity distribution of the sense signal measured in the fourth frame (second connection state).
- the signal threshold NoiseTh is 100
- FingerWidthwithMargin is 7
- the threshold MoveTh is 1.
- the vertical signal lines are drive lines and the horizontal signal lines are sense lines.
- S0 to S10 indicate sense line numbers
- D0 to D20 indicate drive line numbers.
- Set noisysyLineSet (first) ⁇ S3, S4, S5, S6 ⁇ .
- NumNoisyLine (first) 4.
- the horizontal signal line is a drive line
- the vertical signal line is a sense line.
- Set NoisyLineSet (second) ⁇ S6, S7 ⁇ .
- NumNoisyLine (second) 2.
- the vertical signal lines are drive lines, and the horizontal signal lines are sense lines.
- Set NoisyLineSet (third) ⁇ S3, S4, S5, S6 ⁇ .
- NumNoisyLine (third) 4.
- the horizontal signal lines are drive lines, and the vertical signal lines are sense lines.
- Set noisysyLineSet (fourth) ⁇ S8, S9 ⁇ .
- NumNoisyLine (fourth) 2.
- the shift amount between the first frame and the third frame is zero.
- FIG. 24 is a block diagram showing a configuration of the mobile phone 100 of the present embodiment.
- FIG. 25 is a diagram illustrating an appearance of the mobile phone 100.
- the mobile phone 100 (smart phone) includes a CPU 110, a RAM 112, a ROM 111, a camera 113, a microphone 114, a speaker 115, an operation key 116, a display panel 118, a display control circuit 109, and a touch sensor system 1. It has. Each component is connected to each other by a data bus.
- the CPU 110 controls the operation of mobile phone 100.
- the CPU 110 executes a program stored in the ROM 111, for example.
- the operation key 116 receives an instruction input from the user to the mobile phone 100.
- the RAM 112 volatilely stores data generated by executing a program by the CPU 110 or data input via the operation keys 116.
- the ROM 111 stores data in a nonvolatile manner.
- the ROM 111 is a ROM capable of writing and erasing, such as an EPROM (Erasable Programmable Read-Only Memory) or a flash memory.
- EPROM Erasable Programmable Read-Only Memory
- flash memory a flash memory
- the mobile phone 100 may include an interface (IF) for connecting to another electronic device by wire.
- IF interface
- the camera 113 captures a subject in accordance with the operation of the operation key 116 by the user.
- the image data of the photographed subject is stored in the RAM 112 or an external memory (for example, a memory card).
- the microphone 114 receives user's voice input.
- the mobile phone 100 digitizes the input voice (analog data). Then, the mobile phone 100 sends the digitized voice to a communication partner (for example, another mobile phone).
- the speaker 115 outputs a sound based on, for example, music data stored in the RAM 112.
- the touch sensor system 1 includes a touch panel 3 and a capacitance value distribution detection circuit 2.
- the display panel 118 displays images stored in the ROM 111 and the RAM 112 by the display control circuit 109.
- the display panel 118 may be superimposed on the touch panel 3 or may incorporate the touch panel 3.
- the capacitance value distribution detection device includes a plurality of capacitance value distribution detection devices formed at intersections of a plurality of first signal lines (vertical signal lines VL) and a plurality of second signal lines (horizontal signal lines HL), respectively.
- first signal lines vertical signal lines VL
- second signal lines horizontal signal lines HL
- the first signal line is driven to output a charge corresponding to the capacitance from the second signal line, and the first time.
- the second signal line is switched at a second time later than the second time, and the second signal line is driven at a third time later than the second time.
- a capacitance value distribution detecting device for outputting a charge corresponding to a capacitance from the first signal line, wherein presence / absence of external noise generated along an output direction of the charge corresponding to the capacitance through a touched indicator is detected.
- An external noise determination unit (noise detection unit 8) for determination is provided.
- the capacitance value distribution detection device that detects the distribution of capacitance values, it is possible to determine the presence or absence of external noise in which electromagnetic noise received by a human body or the like is mixed through the indicator. .
- the external noise determination unit is located in the first detection region along the first signal line.
- the presence or absence of the external noise can be determined based on the number of superthreshold capacitances and the number of superthreshold capacitances in the second detection region along the second signal line.
- the presence / absence of external noise can be determined based on the number of capacitances whose signals exceed the detection threshold.
- the extraneous noise determination unit detects the number of superthreshold capacitances in the second detection region from a signal corresponding to the capacitance value obtained at the first time, and is obtained at the third time.
- the super-threshold capacitance number in the first detection region may be detected from a signal corresponding to the capacitance value.
- the extraneous noise determination unit calculates the number of capacitances exceeding the detection threshold for each of the second signal lines from the signal corresponding to the capacitance value obtained at the first time. Obtained as the number of capacitances, among the plurality of second signal lines, the number of the second signal lines whose superthreshold capacitance number exceeds the second threshold is obtained as the second number of lines, and the plurality of second signal lines Among the superthreshold capacitance numbers of the second signal lines whose superthreshold capacitance number exceeds a second threshold value as a second total, and the capacitance obtained at the third time For each first signal line, the number of capacitances exceeding the detection threshold is obtained as the superthreshold capacitance number from the signal corresponding to the value, and the superthreshold static value among the plurality of first signal lines is obtained.
- the number of the first signal lines whose capacitance number exceeds the first threshold is obtained as the first line number
- a sum of the superthreshold capacitance numbers of the first signal lines in which the superthreshold capacitance number exceeds a first threshold is obtained as a first sum, and the first sum
- a configuration may be adopted in which the presence or absence of the external noise is determined based on the second total, the first number of lines, and the second number of lines.
- the presence or absence of external noise can be determined according to the number of capacitances exceeding the detection threshold.
- the external noise determination unit obtains, as a noise index, a value obtained by subtracting a value that is twice the product of the first line number and the second line number from the sum of the first sum and the second sum. When the index is greater than zero, it can be determined that the external noise has occurred.
- the number of signals due to external noise can be expressed by a noise index from the signal due to external noise and the signal due to touch of the indicator. For this reason, the presence or absence of external noise can be appropriately determined based on the noise index.
- the external noise determination unit obtains, as a noise index, a value obtained by subtracting a value that is twice the product of the first line number and the second line number from the sum of the first sum and the second sum. When the index is less than or equal to zero, it can be determined that the external noise is not generated.
- the capacitance value distribution detection device further includes an external noise removal reduction unit (operation control unit 7) that removes and reduces the external noise based on a determination result of the external noise determination unit, and the external noise determination unit includes: A configuration may be adopted in which the presence or absence of the external noise is determined after execution of the external noise removal reduction process by the external noise removal reduction unit.
- the capacitance value distribution detection device may further include a notification unit (noise detection unit 8) that notifies the host device of the determination result of the external noise determination unit.
- a notification unit noise detection unit 8 that notifies the host device of the determination result of the external noise determination unit.
- the external noise determination unit measures and accumulates a noise amount of the external noise, and the external noise removal reduction unit removes and reduces the external noise based on a condition when the accumulated noise amount is minimum. It can also be configured.
- the external noise removal reduction unit can appropriately remove and reduce external noise based on the amount of noise.
- the capacitance value distribution detection device includes a phantom noise determination unit (noise detection unit 8) that determines the presence or absence of phantom noise that occurs along the output direction of charges corresponding to the capacitance through a touch of an indicator that moves at high speed. ).
- phantom noise determination unit noise detection unit 8
- the capacitance value distribution detection device switches and controls connection of the first and second signal lines at a fourth time after the third time, and a fifth time after the fourth time.
- the first signal line is driven to output a charge corresponding to the capacitance from the second signal line, and the external noise determination unit causes the signal corresponding to the capacitance value to exceed a detection threshold.
- the extraneous noise determination unit determines the superthreshold capacitance number in the first detection region along the first signal line and the second signal line.
- the presence or absence of the external noise is determined based on the superthreshold capacitance number in the second detection region along the line, and the external noise determination unit is configured to determine the superthreshold value in the second detection region at the first time. Detecting the number of capacitances, and at the third time, a superthreshold in the first detection region; The capacitance number is detected, and the phantom noise determination unit detects a peak position along the second signal line of a signal corresponding to the capacitance at the first time, and the static noise at the fifth time. It can also be set as the structure which detects the peak position along the said 2nd signal line of the signal corresponding to an electric capacity.
- the capacitance value distribution detection device switches and controls connection of the first and second signal lines at a sixth time after the fifth time, and a seventh time after the sixth time. And driving the second signal line to output the electric charge corresponding to the capacitance from the first signal line, and the external noise determination unit is configured to output a signal in the second detection region at the fifth time.
- the threshold capacitance number may be detected, and the superthreshold capacitance number in the first detection region may be detected at the seventh time.
- the capacitance value distribution detection device switches and controls connection of the first and second signal lines at a sixth time after the fifth time, and a seventh time after the sixth time.
- the second signal line is driven to output a charge corresponding to the capacitance from the first signal line, and the phantom noise determination unit outputs a signal corresponding to the capacitance at the first time.
- First determination result obtained by detecting a peak position along the second signal line and detecting a peak position along the second signal line of a signal corresponding to the capacitance at the fifth time. And detecting a peak position along the first signal line of the signal corresponding to the capacitance at the third time, and detecting the peak position along the first signal line of the signal corresponding to the capacitance at the seventh time. Detecting peak position along It may be determined constituting whether the phantom noise based on the second determination result more obtained.
- the capacitance value distribution detection device may further include a notification unit that notifies the host device of the determination result of the phantom noise determination unit.
- the capacitance value distribution detection device may be configured to end the external noise removal reduction process based on the determination result of the phantom noise determination unit.
- the extraneous noise determination unit includes a first determination result based on a detection result at the first time and a detection result at the third time, a detection result at the third time, and a detection result at the fifth time.
- 2 may be configured to determine the presence or absence of the external noise based on a determination result and a third determination result based on the detection result at the fifth time and the detection result at the seventh time.
- a capacitance value distribution detection device detects a distribution of a plurality of capacitance values respectively formed at intersections of a plurality of first signal lines and a plurality of second signal lines.
- the first signal line is driven to output a charge corresponding to the capacitance from the second signal line, and at a second time after the first time, the first signal line is output.
- switching control of the connection of the second signal line, and at a third time after the second time the second signal line is driven to charge corresponding to the capacitance from the first signal line.
- a capacitance value distribution detection device to output, an external noise determination unit for determining the presence or absence of external noise generated along the output direction of electric charge corresponding to the capacitance through the touched first and second indicators And a signal corresponding to the capacitance value exceeds a detection threshold.
- the extraneous noise determination unit includes the superthreshold capacitance number in the first detection region along the first signal line and the second signal. A superthreshold capacitance number in the second detection region along the line, a superthreshold capacitance number in the third detection region along the first signal line, and a fourth along the second signal line.
- the extraneous noise is detected based on the superthreshold capacitance number in the detection region, and the extraneous noise determination unit is configured to detect the superthreshold capacitance number in the second detection region and the first threshold at the first time. And detecting the number of superthreshold capacitances in the first detection region and the number of superthreshold capacitances in the third detection region at the third time. Is detected.
- the present invention can be used for electronic devices such as a capacitance value distribution detection device, a touch panel device, and a mobile phone.
- Touch Sensor System Capacitance Value Distribution Detection Circuit (Capacitance Value Distribution Detection Device) 3 Touch Panel 4 Multiplexer 5 Drive Unit 6 Sense Signal Processing Unit 7 Operation Control Unit (External Noise Removal Reduction Unit) 8 Noise detection unit (external noise determination unit, phantom noise determination unit, notification unit) 9 Touch position detection unit 10 Parameter storage unit 11 Connection switching unit 100 Mobile phone 109 Display control circuit 110 CPU 111 ROM 112 RAM 113 Camera 114 Microphone 115 Speaker 116 Operation key 118 Display panel C11 to CMM Capacitance CL Control line DL1 to DLM Drive line HL1 to HLM Horizontal signal line (second signal line) SL1 to SLM Sense lines SW1 to SW4 CMOS switches VL1 to VLM Vertical signal lines (first signal lines) inv inverter
Abstract
Description
以下、本発明の実施形態について、詳細に説明する。
図1は、本実施形態に係るタッチセンサシステム1(タッチパネル装置)の構成を示すブロック図である。図2は、タッチセンサシステム1に設けられたタッチパネル3の構成を示す模式図である。
ここで、外来ノイズが存在する場合に、センス信号にどのように影響を与えるかについて簡単に説明する。
図7は、本実施形態のノイズ検出のフローを示す図である。
-2×NumNoisyLine(first)×NumNoisyLine(second)
外来ノイズが大きいほどノイズ指標NoiseMetricは大きくなると考えられる。ノイズ検知部8は、NoiseMetric>0である場合(ST7でYes)、外来ノイズが存在すると判定する。
垂直信号線が21本、水平信号線が11本であるタッチパネルを例に挙げて、ノイズ判定処理の具体例を説明する。
次に、別の強度分布が得られた場合のノイズ判定処理の具体例について説明する。
次に、別の強度分布が得られた場合のノイズ判定処理の具体例について説明する。ここでは、2つの指示体が互いに離れた位置に同時にタッチしている状況について説明する。
なお、以上では各ドライブラインに駆動信号を順次出力する形態に基づいて説明したが、これに限らない。本実施形態は、複数の駆動信号を符号化し、複数のドライブラインを並列駆動するタッチパネル装置(例えば特許文献4参照)についても適用することが可能である。複数の駆動信号は、それぞれが直交する信号(線形独立な信号、基底ベクトル)となるようなパルスを有する。この場合は、センスラインから出力された信号は、複数の静電容量(交点)に対応する信号の線形和として得られる。センスラインから出力された信号を所定の演算で復号することで、各静電容量値に対応する信号強度を有する信号を得ることができる。
本発明の他の実施形態について説明する。なお、説明の便宜上、前記実施形態にて説明した図面と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本実施形態では、タッチセンサシステム1は、第1接続状態で2回および第2接続状態で2回、各交点の静電容量の測定を行う。
図19は、本実施形態のノイズ検出のフローを示す図である。本実施形態では、タッチセンサシステム1は、ファントムノイズおよび外来ノイズの両方の有無を判定する。
垂直信号線が21本、水平信号線が11本であるタッチパネルを例に挙げて、ノイズ判定処理の具体例を説明する。
本発明の他の実施形態について説明する。なお、説明の便宜上、前記実施形態にて説明した図面と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。本実施形態では、実施形態1のタッチセンサシステム1を搭載した電子機器の例である携帯電話機100について説明する。
図24は、本実施形態の携帯電話機100の構成を示すブロック図である。図25は、携帯電話機100の外観を示す図である。
本発明の一態様に係る静電容量値分布検出装置は、複数の第1信号線(垂直信号線VL)と複数の第2信号線(水平信号線HL)との交点にそれぞれ形成される複数の静電容量の値の分布を検出するために、第1時刻において、前記第1信号線を駆動して前記静電容量に対応する電荷を前記第2信号線から出力させ、前記第1時刻よりも後の第2時刻において、前記第1及び前記第2信号線の接続を切替制御し、前記第2時刻よりも後の第3時刻において、前記第2信号線を駆動して前記静電容量に対応する電荷を前記第1信号線から出力させる静電容量値分布検出装置であって、タッチした指示体を通じて前記静電容量に対応する電荷の出力方向に沿って生じる外来ノイズの有無を判定する外来ノイズ判定部(ノイズ検知部8)を備える。
2 静電容量値分布検出回路(静電容量値分布検出装置)
3 タッチパネル
4 マルチプレクサ
5 駆動部
6 センス信号処理部
7 動作制御部(外来ノイズ除去低減部)
8 ノイズ検知部(外来ノイズ判定部、ファントムノイズ判定部、通知部)
9 タッチ位置検出部
10 パラメータ記憶部
11 接続切替部
100 携帯電話機
109 表示制御回路
110 CPU
111 ROM
112 RAM
113 カメラ
114 マイクロフォン
115 スピーカ
116 操作キー
118 表示パネル
C11~CMM 静電容量
CL 制御ライン
DL1~DLM ドライブライン
HL1~HLM 水平信号線(第2信号線)
SL1~SLM センスライン
SW1~SW4 CMOSスイッチ
VL1~VLM 垂直信号線(第1信号線)
inv 反転器
Claims (19)
- 複数の第1信号線と複数の第2信号線との交点にそれぞれ形成される複数の静電容量の値の分布を検出するために、第1時刻において、前記第1信号線を駆動して前記静電容量に対応する電荷を前記第2信号線から出力させ、前記第1時刻よりも後の第2時刻において、前記第1及び前記第2信号線の接続を切替制御し、前記第2時刻よりも後の第3時刻において、前記第2信号線を駆動して前記静電容量に対応する電荷を前記第1信号線から出力させる静電容量値分布検出装置であって、
タッチした指示体を通じて前記静電容量に対応する電荷の出力方向に沿って生じる外来ノイズの有無を判定する外来ノイズ判定部を設けたことを特徴とする静電容量値分布検出装置。 - 前記静電容量値に対応する信号が検出閾値を超える静電容量の数を超閾値静電容量数としたとき、
前記外来ノイズ判定部は、前記第1信号線に沿った第1検出領域内の超閾値静電容量数と、前記第2信号線に沿った第2検出領域内の超閾値静電容量数とに基づいて前記外来ノイズの有無を判定する請求項1に記載の静電容量値分布検出装置。 - 前記外来ノイズ判定部は、前記第1時刻において得られた前記静電容量値に対応する信号から前記第2検出領域内の超閾値静電容量数を検出し、前記第3時刻において得られた前記静電容量値に対応する信号から前記第1検出領域内の超閾値静電容量数を検出する請求項2に記載の静電容量値分布検出装置。
- 前記外来ノイズ判定部は、
前記第1時刻において得られた前記静電容量値に対応する信号から、前記第2信号線毎に、前記検出閾値を超える静電容量の数を前記超閾値静電容量数として求め、
前記複数の第2信号線のうち、前記超閾値静電容量数が第2閾値を超える前記第2信号線の数を第2線数として求め、
前記複数の第2信号線のうち、前記超閾値静電容量数が第2閾値を超える前記第2信号線の前記超閾値静電容量数の合計を第2合計として求め、
前記第3時刻において得られた前記静電容量値に対応する信号から、前記第1信号線毎に、前記検出閾値を超える静電容量の数を前記超閾値静電容量数として求め、
前記複数の第1信号線のうち、前記超閾値静電容量数が第1閾値を超える前記第1信号線の数を第1線数として求め、
前記複数の第1信号線のうち、前記超閾値静電容量数が第1閾値を超える前記第1信号線の前記超閾値静電容量数の合計を第1合計として求め、
前記第1合計、前記第2合計、前記第1線数、および前記第2線数に基づいて、前記外来ノイズの有無を判定することを特徴とする請求項2に記載の静電容量値分布検出装置。 - 前記外来ノイズ判定部は、前記第1合計および前記第2合計の和から、前記第1線数および前記第2線数の積の2倍した値を減算した値をノイズ指標として求め、前記ノイズ指標が零より大きい場合、前記外来ノイズが発生したと判定する請求項4に記載の静電容量値分布検出装置。
- 前記外来ノイズ判定部は、前記第1合計および前記第2合計の和から、前記第1線数および前記第2線数の積の2倍した値を減算した値をノイズ指標として求め、前記ノイズ指標が零以下の場合、前記外来ノイズが発生していないと判定する請求項4に記載の静電容量値分布検出装置。
- 前記外来ノイズ判定部の判定結果に基づいて前記外来ノイズを除去低減する外来ノイズ除去低減部をさらに備え、
前記外来ノイズ判定部は、前記外来ノイズ除去低減部による外来ノイズ除去低減処理の実行後、前記外来ノイズの有無を判定する請求項1に記載の静電容量値分布検出装置。 - 前記外来ノイズ判定部の判定結果をホスト装置に通知する通知部をさらに備える請求項1に記載の静電容量値分布検出装置。
- 前記外来ノイズ判定部は、前記外来ノイズのノイズ量を測定して蓄積し、
前記外来ノイズ除去低減部は、前記蓄積されたノイズ量が最小のときの条件に基づいて前記外来ノイズを除去低減する請求項7に記載の静電容量値分布検出装置。 - 高速に移動する指示体のタッチを通じて前記静電容量に対応する電荷の出力方向に沿って生じるファントムノイズの有無を判定するファントムノイズ判定部をさらに備える請求項1に記載の静電容量値分布検出装置。
- 前記静電容量値分布検出装置は、前記第3時刻よりも後の第4時刻において、前記第1及び前記第2信号線の接続を切替制御し、前記第4時刻よりも後の第5時刻において、前記第1信号線を駆動して前記静電容量に対応する電荷を前記第2信号線から出力させ、
前記外来ノイズ判定部は、前記静電容量値に対応する信号が検出閾値を超える静電容量の数を超閾値静電容量数としたとき、
前記外来ノイズ判定部は、前記第1信号線に沿った第1検出領域内の超閾値静電容量数と、前記第2信号線に沿った第2検出領域内の超閾値静電容量数とに基づいて前記外来ノイズの有無を判定し、
前記外来ノイズ判定部は、前記第1時刻において、前記第2検出領域内の超閾値静電容量数を検出し、前記第3時刻において、前記第1検出領域内の超閾値静電容量数を検出し、
前記ファントムノイズ判定部は、前記第1時刻において前記静電容量に対応する信号の前記第2信号線に沿ったピーク位置を検出し、前記第5時刻において前記静電容量に対応する信号の前記第2信号線に沿ったピーク位置を検出する請求項10に記載の静電容量値分布検出装置。 - 前記静電容量値分布検出装置は、前記第5時刻よりも後の第6時刻において、前記第1及び前記第2信号線の接続を切替制御し、前記第6時刻よりも後の第7時刻において、前記第2信号線を駆動して前記静電容量に対応する電荷を前記第1信号線から出力させ、
前記外来ノイズ判定部は、前記第5時刻において、前記第2検出領域内の超閾値静電容量数を検出し、前記第7時刻において、前記第1検出領域内の超閾値静電容量数を検出する請求項11に記載の静電容量値分布検出装置。 - 前記静電容量値分布検出装置は、前記第5時刻よりも後の第6時刻において、前記第1及び前記第2信号線の接続を切替制御し、前記第6時刻よりも後の第7時刻において、前記第2信号線を駆動して前記静電容量に対応する電荷を前記第1信号線から出力させ、
前記ファントムノイズ判定部は、前記第1時刻において前記静電容量に対応する信号の前記第2信号線に沿ったピーク位置を検出し、前記第5時刻において前記静電容量に対応する信号の前記第2信号線に沿ったピーク位置を検出することにより得られた第1判定結果と、前記第3時刻において前記静電容量に対応する信号の前記第1信号線に沿ったピーク位置を検出し、前記第7時刻において前記静電容量に対応する信号の前記第1信号線に沿ったピーク位置を検出することにより得られた第2判定結果とに基づいて前記ファントムノイズの有無を判定する請求項11に記載の静電容量値分布検出装置。 - 前記ファントムノイズ判定部の判定結果をホスト装置に通知する通知部をさらに備える請求項10に記載の静電容量値分布検出装置。
- 前記ファントムノイズ判定部の判定結果に基づいて外来ノイズ除去低減処理を終了する請求項13に記載の静電容量値分布検出装置。
- 前記外来ノイズ判定部は、前記第1時刻での検出結果及び前記第3時刻での検出結果による第1判定結果と、前記第3時刻での検出結果及び前記第5時刻での検出結果による第2判定結果と、前記第5時刻での検出結果及び前記第7時刻での検出結果による第3判定結果とに基づいて前記外来ノイズの有無を判定する請求項12に記載の静電容量値分布検出装置。
- 複数の第1信号線と複数の第2信号線との交点にそれぞれ形成される複数の静電容量の値の分布を検出するために、第1時刻において、前記第1信号線を駆動して前記静電容量に対応する電荷を前記第2信号線から出力させ、前記第1時刻よりも後の第2時刻において、前記第1及び前記第2信号線の接続を切替制御し、前記第2時刻よりも後の第3時刻において、前記第2信号線を駆動して前記静電容量に対応する電荷を前記第1信号線から出力させる静電容量値分布検出装置であって、
タッチした第1及び第2指示体を通じて前記静電容量に対応する電荷の出力方向に沿って生じる外来ノイズの有無を判定する外来ノイズ判定部を設け、
前記静電容量値に対応する信号が検出閾値を超える静電容量の数を超閾値静電容量数としたとき、
前記外来ノイズ判定部は、前記第1信号線に沿った第1検出領域内の超閾値静電容量数と、前記第2信号線に沿った第2検出領域内の超閾値静電容量数と、前記第1信号線に沿った第3検出領域内の超閾値静電容量数と、前記第2信号線に沿った第4検出領域内の超閾値静電容量数とに基づいて前記外来ノイズを検出し、
前記外来ノイズ判定部は、前記第1時刻において、前記第2検出領域内の超閾値静電容量数と前記第4検出領域内の超閾値静電容量数とを検出し、前記第3時刻において、前記第1検出領域内の超閾値静電容量数と前記第3検出領域内の超閾値静電容量数とを検出することを特徴とする静電容量値分布検出装置。 - 請求項1から17のいずれか一項に記載の静電容量値分布検出装置を備えることを特徴とするタッチパネルシステム。
- 複数の第1信号線と複数の第2信号線との交点にそれぞれ形成される複数の静電容量の値の分布を検出する静電容量値分布検出装置の検出方法であって、
前記第1信号線を駆動して、前記静電容量に対応する第1の電荷を前記第2信号線から出力させるステップと、
前記第2信号線を駆動して、前記静電容量に対応する第2の電荷を前記第1信号線から出力させるステップと、
前記第1の電荷と前記第2の電荷に基づき、タッチした指示体を通じて前記静電容量に対応する電荷の出力方向に沿って生じる外来ノイズの有無を判定するステップとを含むことを特徴とする静電容量値分布検出装置の検出方法。
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JP (1) | JP5714778B2 (ja) |
TW (1) | TWI536216B (ja) |
WO (1) | WO2014042128A1 (ja) |
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TWI536216B (zh) | 2016-06-01 |
JPWO2014042128A1 (ja) | 2016-08-18 |
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TW201423515A (zh) | 2014-06-16 |
US20150184991A1 (en) | 2015-07-02 |
US9335148B2 (en) | 2016-05-10 |
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