WO2015087621A1 - タッチセンサ制御装置 - Google Patents
タッチセンサ制御装置 Download PDFInfo
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- WO2015087621A1 WO2015087621A1 PCT/JP2014/077933 JP2014077933W WO2015087621A1 WO 2015087621 A1 WO2015087621 A1 WO 2015087621A1 JP 2014077933 W JP2014077933 W JP 2014077933W WO 2015087621 A1 WO2015087621 A1 WO 2015087621A1
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- touch
- calibration
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- touch sensor
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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
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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
- G06F3/0412—Digitisers structurally integrated in a display
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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
Definitions
- the present invention relates to a touch sensor control device, a touch panel system including the same, and the like.
- touch panel systems that accept user instructions by detecting the position of an indicator that touches or approaches the detection surface of the touch panel (for example, the user's finger or stylus pen, the same applies hereinafter) Increasingly, it is mounted on electronic information equipment.
- projection capacitive touch panels capable of multi-touch are increasingly mounted on electronic information devices.
- an indicator that is in contact with or close to the detection surface is detected based on a processing result of a signal generated by the touch panel.
- the signal generated by the touch panel is affected by various influences such as non-uniformity in the structure of the touch panel, dirt attached to the detection surface, or aging deterioration. Therefore, when the indicator is detected by directly using the processing result of the signal generated by the touch panel, the detection sensitivity of the indicator in the detection surface becomes non-uniform.
- the indicator when the detection sensitivity of the indicator in the detection surface becomes non-uniform, for example, the indicator is likely to be detected at a certain position in the detection surface, but it is difficult to detect the indicator at other positions. obtain.
- non-instruction state a state where there is no indicator in contact with or close to the detection surface
- the distribution of the capacitance value of the touch panel changes due to a temperature change or a change with time, it is preferable that calibration is performed periodically at the time of power-on in addition to during the manufacture.
- Patent Document 1 describes that when the human sensor detects the presence of an approaching object during automatic calibration, the automatic calibration of the touch panel is stopped. This prevents incorrect calibration from being performed.
- JP 2012-118850 A (published on June 21, 2012)
- Patent Document 1 if a person approaches the touch panel for a long time, calibration cannot be performed during that period. Therefore, there is a possibility that the period during which calibration is not performed continues for a long time. Thereby, erroneous detection of the touch position may occur.
- a touch sensor control device that performs appropriate calibration can be realized.
- a touch sensor control device is a touch sensor control device that controls a touch sensor, the touch position specifying unit for specifying a touch position on a detection surface of the touch sensor, and the touch position according to the touch position.
- a mask setting unit that sets a mask region, and a calibration unit that calibrates the detection sensitivity of a touch for a region excluding the mask region on the detection surface.
- the touch sensor control method includes a touch position specifying step of specifying a touch position on a detection surface of the touch sensor, a mask setting step of setting a mask region in accordance with the touch position, and the detection And a calibration step for calibrating the touch detection sensitivity with respect to an area excluding the mask area on the surface.
- appropriate calibration can be performed at a desired timing.
- FIG. 3 is an enlarged plan view showing a touch sensor region corresponding to the mask region of FIG. 2. It is a figure which shows the flow of the calibration operation
- FIG. 1 is a block diagram illustrating a schematic configuration of an electronic information device 1 according to the present embodiment.
- the electronic information device 1 includes a touch panel 2, a touch sensor control unit 3 (touch sensor control device), and a host control unit 4.
- the touch panel 2 and the touch sensor control unit 3 constitute a touch panel system.
- Specific examples of the electronic information device 1 having a touch panel include a mobile phone, a smartphone, a notebook PC (personal computer), a tablet terminal, an e-book reader, or a PDA (Personal Digital Assistant), a large touch display, an automatic teller machine ( cash machine).
- the touch panel 2 includes a touch sensor 5 and a display unit 6.
- the touch panel 2 is a capacitive touch panel, but the system is not limited to this.
- the touch sensor 5 is a position input device arranged so as to overlap the display unit 6.
- the touch sensor 5 includes a plurality of detection signal lines SL extending along the horizontal direction and a plurality of drive signal lines DL extending along the vertical direction.
- a capacitance is formed at the intersection of the detection signal line SL and the drive signal line DL that overlap each other. Note that the detection signal line SL and the drive signal line DL may not be along the horizontal direction and the vertical direction, respectively.
- the display unit 6 is a display device such as a liquid crystal display device or an organic EL display, but is not limited thereto.
- the host control unit 4 mainly controls the electronic information device 1 that is a host.
- the host control unit 4 receives information on the touch position detected by the touch sensor control unit 3 and performs processing based on the touch position.
- the host control unit 4 supplies display data to be displayed on the display unit 6 and performs display control of the display unit 6.
- the touch sensor control unit 3 drives the touch sensor 5 and detects the touch position of the indicator with respect to the touch sensor 5.
- the touch sensor control unit 3 includes a drive unit 11, a signal acquisition unit 12 (signal acquisition unit), a signal value adjustment unit 13 (signal value adjustment unit), a touch position detection unit 14 (touch position specifying unit), and a mask generation unit 15 ( A mask setting unit), a calibration value generation unit 16 (calibration unit), and a storage unit 17.
- the drive unit 11 supplies a drive signal to the plurality of drive signal lines DL of the touch sensor 5 at a predetermined timing for detecting an indicator (for example, a user's finger or stylus pen). In addition, the drive unit 11 supplies a drive signal to the plurality of drive signal lines DL of the touch sensor 5 at a predetermined timing when the detection sensitivity calibration operation is performed.
- the signal acquisition unit 12 acquires (detects) sense signals output from the plurality of detection signal lines SL according to the drive signal.
- the capacitance value of the capacitance formed at the intersection (detection point) between the detection signal line SL and the drive signal line DL changes. Therefore, the value of the sense signal obtained from the detection signal line SL changes according to the capacitance value of the capacitance at the detection point.
- the signal acquisition unit 12 acquires sense signals corresponding to a plurality of detection points according to a combination of the plurality of drive signal lines DL and the plurality of detection signal lines SL.
- the signal acquisition unit 12 generates two-dimensional sense data representing the value of the sense signal corresponding to the detection surface of the touch sensor 5.
- the signal acquisition unit 12 outputs the sense data to the signal value adjustment unit 13.
- the signal acquisition unit 12 outputs sense data to the calibration value generation unit 16 in addition to the signal value adjustment unit 13.
- the output sense data may be a digital value converted corresponding to the value of the sense signal.
- Each element of the two-dimensional sense data represents a sense signal value and corresponds to the capacitance value of the capacitance of the corresponding detection point. That is, each element of the two-dimensional sense data has a value corresponding to the presence or absence of an indicator that is in contact with or close to each detection point.
- the signal value adjustment unit 13 adjusts the value of the sense data based on the stored detection sensitivity calibration data.
- the calibration data has a reference value (for example, an average value) of sense signal values acquired in the non-instruction state for each detection point.
- the calibration data is two-dimensional data including a reference value for each detection point.
- the non-instruction state is a state where there is no indicator that is in contact with or close to the detection surface.
- the signal value adjustment unit 13 generates an adjusted signal value by subtracting the reference value indicated by the calibration data from the sense signal value of the sense data for each detection point.
- the adjusted signal value in the non-instruction state is within a certain range (here, ⁇ 10 to +10) at a plurality of detection points.
- the adjusted signal value at the detection point where the indicator is not in contact with or in proximity is ⁇ 10 to +10
- the adjusted signal value at the detection point where the indicator is in contact or in proximity is a value greater than +10. .
- the signal value adjustment unit 13 outputs the two-dimensional adjusted sense data to the touch position detection unit 14.
- the two-dimensional adjusted sense data has adjusted signal values corresponding to a plurality of detection points as elements.
- the touch position detection unit 14 specifies the touch position where the indicator 7 is in contact with or close to the detection surface based on the adjusted sense data. For example, the touch position detection unit 14 may specify a position corresponding to a detection point where the adjusted signal value is a maximum (peak) and is equal to or greater than a predetermined threshold as the touch position. In addition, the touch position detection unit 14 may specify a position corresponding to a detection point where the adjusted signal value is equal to or greater than a predetermined threshold as the touch position. The touch position detection unit 14 may specify a plurality of positions as touch positions according to the peak of the adjusted signal value.
- the touch position detection unit 14 outputs information indicating the specified touch position to the host control unit 4.
- the touch position detection unit 14 outputs information indicating the specified touch position to the mask generation unit 15 in addition to the host control unit 4.
- the touch position detection unit 14 outputs that there is no touch to the host control unit 4 or the mask generation unit 15.
- the mask generation unit 15 sets a mask area according to the specified touch position.
- the mask area includes a touch position and a peripheral area of the touch position.
- the mask area is a predetermined range centered on the touch position.
- the mask generation unit 15 sets a plurality of mask areas corresponding to the plurality of touch positions.
- the mask generation unit 15 outputs information indicating the specified mask region to the calibration value generation unit 16.
- the calibration value generation unit 16 generates new calibration data based on the unadjusted sense data received from the signal acquisition unit 12, the mask region, and the previous calibration data.
- the calibration value generation unit 16 stores the generated calibration data in the storage unit 17 and outputs the generated calibration data to the signal value adjustment unit 13.
- the calibration value generation unit 16 also stores temporary calibration data generated in the process of generating calibration data in the storage unit 17.
- the calibration value generation unit 16 reads out these data stored in the storage unit 17 as necessary. The method of generating the calibration data by the calibration value generation unit 16 will be described in detail later.
- FIG. 2 is a diagram for explaining an outline of a method for generating calibration data according to the present embodiment.
- 2A shows a state where the indicator 7 (user's finger) is in contact with the screen (detection surface) of the touch panel 2 of the electronic information device 1.
- FIG. 2A shows a state where the indicator 7 (user's finger) is in contact with the screen (detection surface) of the touch panel 2 of the electronic information device 1.
- FIG. 2 shows the two-dimensional sense data 21 obtained when the indicator 7 is in contact.
- the point where the indicator 7 is in contact is the touch position 22.
- the value of the sense data (unadjusted sense signal value) increases.
- the sense data value increases to some extent even in the peripheral region of the touch position 22.
- a predetermined area centered on the touch position 22 is defined as a mask area 23.
- the mask area 23 includes an area where the value of the sense data is changed by the contact or proximity of the indicator 7.
- FIG. 2 shows the masked two-dimensional sense data 21.
- the data in the mask area 23 is removed (masked).
- data corresponding to the mask region 23 is extracted from the calibration data 26 generated in the past (for example, the previous time).
- Two-dimensional temporary calibration data 27 is generated by synthesizing the masked sense data 21 and the data extracted from the past calibration data 26 ((d) in FIG. 2).
- the temporary calibration data 27 for the area excluding the mask area 23, the data of the sense data 21 generated in the current calibration is used.
- the temporary calibration data 27 for the mask region 23 the data of the calibration data 26 generated in the past calibration is used. Even when a plurality of mask areas 23 are set, the same processing is performed for each mask area 23.
- the latest sense signal is reflected in the area other than the mask area 23 of the temporary calibration data 27, that is, the latest capacitance value of the touch sensor 5 is reflected.
- FIG. 3 is an enlarged plan view showing an area of the touch sensor 5 corresponding to the mask area 23 of FIG.
- the drive signal line DL includes a plurality of square electrodes 24 that are continuous in the vertical direction.
- the detection signal line SL includes a plurality of square electrodes 25 that are continuous in the horizontal direction.
- the electrodes 24 and 25 may be formed of transparent electrodes, or may be formed of grid-like metal wiring.
- the intersection (detection point) between the drive signal line DL and the detection signal line SL is indicated by a circle.
- the darkness of the circle indicates the magnitude of the influence (change in sense signal value) due to the contact of the indicator 7.
- a detection point closer to the touch position 22 has a larger change in the sense signal value.
- a rectangular area of detection points within 3 pitches in the vertical and horizontal directions with the touch position 22 as the center is set as a mask area.
- the pitch of the signal lines is 5 mm
- a 3 cm ⁇ 3 cm square area on the detection surface is included in the mask area. If at least an area of 3 cm in length ⁇ 3 cm in width is used as a mask area, an area where the sense signal value changes when the indicator 7 is a finger can be masked.
- the upper limit of the area of the mask region may be a predetermined ratio or less with respect to the area of the detection surface.
- An area including a touch position where the change in the sense signal value is greater than or equal to a predetermined value may be used as a mask area.
- the upper limit of the area of the mask region may be set to 1/5 of the area of the detection surface.
- the ratio of the area of the mask area to the detection surface exceeds 1/5, the noise of the non-touch area (area where the indicator is not in contact) due to crosstalk becomes significant, so that the touch sensor is correctly calibrated. I can't do that. Therefore, when the ratio of the area (or mask area) where the change in the sense signal value exceeds a predetermined value exceeds the upper limit (1/5), the touch sensor control unit 3 can also stop the calibration operation.
- FIG. 4 is a diagram illustrating a flow of the calibration operation according to the present embodiment.
- the calibration operation is automatically started, for example, when the electronic information device 1 is started up or returned from the sleep state. Further, the calibration operation may be automatically started at regular intervals during the operation of the electronic information device 1.
- the drive unit 11 supplies a drive signal to the plurality of drive signal lines DL of the touch sensor 5.
- the signal acquisition unit 12 acquires sense signals output from the plurality of detection signal lines SL according to the drive signal (step S1).
- the signal acquisition unit 12 generates sense data corresponding to the sense signal.
- the signal value adjustment unit 13 adjusts the value of the sense data based on the stored calibration data (calibration data generated in the previous calibration).
- the touch position detection unit 14 specifies the touch position based on the adjusted sense data.
- the mask generation unit 15 When the touch is not detected (No in S2), the mask generation unit 15 does not set the mask area. In addition, the calibration value generation unit 16 stores the sense data generated (not adjusted) by the signal acquisition unit 12 in the storage unit 17 as M-th temporary calibration data (S3).
- the mask generation unit 15 sets a mask area according to the specified touch position (S4).
- the calibration value generation unit 16 removes the mask area data from the sense data generated by the signal acquisition unit 12 (S5).
- the calibration value generation unit 16 acquires the calibration data generated last time from the storage unit 17, and extracts data corresponding to the mask area from the calibration data generated last time (S6).
- the calibration value generation unit 16 may use calibration data before that instead of the previous time.
- the calibration value generation unit 16 generates temporary calibration data by combining (summing) the masked sense data and the data extracted from the previously generated calibration data (S7). .
- the calibration value generation unit 16 stores the generated temporary calibration data in the storage unit 17 as M-th (1 ⁇ M ⁇ N, where M and N are integers) temporary calibration data (S3).
- the touch sensor control unit 3 repeats the processing from S1 to S7 N times (S8). That is, the sense data is generated N times at different timings, and N temporary calibration data corresponding to the N sense data are generated.
- the calibration value generation unit 16 reads out the N pieces of temporary calibration data from the storage unit 17.
- the calibration value generation unit 16 generates representative data of N pieces of temporary calibration data. Specifically, the calibration value generation unit 16 generates new calibration data by averaging N pieces of temporary calibration data for each element (detection point) (S9).
- the calibration data is updated in this way, and the updated calibration data is used for adjustment of the sense data by the signal value adjustment unit 13.
- the influence of noise can be reduced by using a calibration data obtained by averaging a plurality of temporary calibration data.
- the touch position detection unit 14 specifies the touch position of the indicator 7 every time N sense signals are detected.
- the mask areas for a plurality (N) of sense data can be different.
- the generation of representative data is not limited to the average value, and can be performed by obtaining an arbitrary representative value (for example, an intermediate value) for each element.
- FIG. 5 is a graph showing an example of sense data before adjustment in the non-instruction state.
- the x-axis indicates the coordinate in the horizontal direction
- the y-axis indicates the coordinate in the vertical direction
- the z-axis indicates the value of the sense signal.
- the value of the unadjusted sense data is generally not uniform. This non-uniformity is caused by, for example, the presence of a conductor such as a metal in the vicinity of the drive signal line DL or the detection signal line SL, the non-uniformity in the structure of the touch panel 2, the temperature distribution, or the like.
- the capacitance value that is, the sense signal value
- the touch position may be erroneously recognized.
- FIG. 6 is a graph showing an example of sense data adjusted using calibration data.
- the indicator 7 is in contact with the upper right of the detection surface.
- FIG. 6A shows sense data adjusted using calibration data that has not been updated for a long time.
- FIG. 6B shows sense data adjusted using appropriately updated calibration data.
- each axis shows the same thing as FIG.
- the value of the sense data whose line color is gray is in the range of ⁇ 10 to +10, and the value of the sense data whose line color is black is outside the above range.
- the value of the sense data at the position where the indicator 7 is not in contact with or in proximity is uniform. is there.
- the value of the sense data is between ⁇ 10 and 10. Therefore, the touch position can be accurately specified by comparing the adjusted sense data value with the threshold value.
- the calibration data can be updated based on the latest sense signal for the region excluding the touch position where the indicator 7 is in contact with or in proximity. Further, with respect to the touch position, the influence of contact and proximity of the indicator 7 can be eliminated by using past (previous) calibration data. Therefore, even if the indicator 7 is in contact with or close to the touch panel 2, the touch sensor control unit 3 can appropriately perform calibration. Therefore, the touch sensor control unit 3 can appropriately perform calibration at a desired timing. As a result, as shown in (b) of FIG. 6, it is possible to obtain adjusted sense data with uniform values at a position where the indicator 7 is not in contact with or in close proximity using appropriate calibration data. Further, the touch sensor control unit 3 can execute calibration while receiving a position input by the indicator 7. Further, in the configuration described in Patent Document 1, a human sensor different from the touch sensor is required, but the touch sensor control unit 3 of the present embodiment does not require another sensor.
- each time N sense signals are detected the touch position and the mask area are specified based on the Mth sense data, and the mask area is applied to the Mth sense data.
- the mask area may not be specified in time. That is, when the mask area is specified based on the Mth sense data, the next (M + 1) th sense data may be generated. The old (Mth) sense data may be erased due to memory limitations.
- the pointer is not moved, there is no problem even if the mask area is applied to the (M + 1) th sense data based on the Mth sense data.
- the indicator is moving, the mask area may not be able to mask the touch position in the (M + 1) th sense data.
- the touch sensor control unit predicts the movement of the indicator and sets the mask area. Since the configuration of the electronic information device 1 is the same as that of the first embodiment, detailed description thereof is omitted.
- FIG. 7 is a diagram for explaining the outline of the calibration data generation method according to this embodiment.
- FIG. 7A shows a state in which the indicator 7 (user's finger) is in contact with the screen (detection surface) of the touch panel 2 of the electronic information device 1.
- the indicator 7 has moved in the direction of the arrow shown.
- the detection of the sense signal is performed at regular intervals (for example, every 1/120 second or every 1/200 second). For example, the detection of the sense signal is performed at times t0, t1, and t2.
- FIG. 7 shows the two-dimensional sense data 21a at time t1.
- the touch position at time t1 is the touch position 22.
- the mask generation unit 15 obtains a motion vector 31 representing the movement of the touch position based on the touch positions at time t0 and time t1.
- the mask generation unit 15 can predict the touch position 32 at time t2 after time t1 from the touch position 22 at time t1 and the motion vector 31.
- the touch position 32 represents an arrival position where the indicator is predicted to arrive at time t2.
- the mask area 23 is set so as to include the touch position 32 and its peripheral area at the predicted time t2.
- the mask area 23 is a rectangular area including the touch position 22 and its peripheral area at time t1, and the touch position 32 and its peripheral area at time t2.
- the peripheral area is surrounded by a dotted line.
- the mask area 23 generated based on the sense data at time t1 includes an area where the indicator 7 is predicted to be in contact with or close to at time t2.
- the mask area 23 includes from the touch position 22 at time t 1 to the touch position 32 at time t 2 predicted by the motion vector 31. Therefore, even when the movement of the indicator 7 changes (when it stops) after time t1, the mask region 23 can include the position of the indicator 7 at time t2.
- FIG. 7 shows the masked two-dimensional sense data 21b at time t2.
- the data in the mask area 23 is removed (masked).
- data corresponding to the mask area 23 is extracted from the calibration data 26 generated in the past (previous).
- the two-dimensional temporary calibration data 27 is generated by synthesizing the masked sense data 21b and the data extracted from the past calibration data 26 ((d) in FIG. 7).
- the data of the sense data 21b generated in the current calibration is used for the area excluding the mask area 23.
- the data of the calibration data 26 generated in the past calibration is used. Even when a plurality of mask areas 23 are set, the same processing is performed for each mask area 23.
- FIG. 8 is a diagram illustrating a flow of the calibration operation according to the present embodiment. Note that time t1 is later than time t0, and time t2 is later than time t1. Since the processing of S2, S7 to S9 is the same as that of the first embodiment, the description thereof will be omitted as appropriate.
- the drive unit 11 supplies drive signals to the plurality of drive signal lines DL of the touch sensor 5 at regular intervals for detection of the touch position.
- the signal acquisition unit 12 acquires sense signals output from the plurality of detection signal lines SL in accordance with the drive signals at each time (step S1).
- the signal acquisition unit 12 generates sense data corresponding to the sense signal.
- the signal value adjusting unit 13 adjusts the value of the sense data based on the stored previous calibration data.
- the touch position detection unit 14 specifies the touch position based on the adjusted sense data.
- the mask generation unit 15 When the touch is not detected (No in S2), the mask generation unit 15 does not set the mask area. In addition, the calibration value generation unit 16 stores the sense data generated (not adjusted) by the signal acquisition unit 12 in the storage unit 17 as M-th temporary calibration data (S3).
- the mask generation unit 15 predicts the touch movement (S11). Specifically, the mask generation unit 15 specifies a motion vector representing the movement of the touch position (or indicator) based on the touch position at time t0 and the touch position at time t1. Note that the mask generation unit 15 stores a past touch position (time t0) for generating a motion vector. Further, the mask generation unit 15 sets a mask region so as to include the predicted touch position at time t2 according to the touch position at time t1 and the motion vector (S12).
- the calibration value generating unit 16 removes the mask area data set based on the touch position at time t1 from the sense data at time t2 (S13).
- the calibration value generation unit 16 acquires the calibration data generated last time from the storage unit 17, and extracts data corresponding to the mask area from the calibration data generated last time (S14).
- the calibration value generation unit 16 generates temporary calibration data by synthesizing the masked sense data and the data extracted from the previously generated calibration data (S7).
- the calibration value generation unit 16 stores the generated temporary calibration data in the storage unit 17 as M-th (1 ⁇ M ⁇ N, where M and N are integers) temporary calibration data (S3).
- the touch sensor control unit 3 predicts the touch position of the latest sense data by predicting the movement of the touch position.
- the touch sensor control unit 3 sets the mask area so as to include the predicted touch position.
- the touch sensor control unit 3 applies the mask area determined based on the past sense data to the latest sense data.
- the position of the mask area changes every time the sense data is acquired.
- the mask area in the first temporary calibration data (the area to which the past calibration data is applied) is not the mask area in the second temporary calibration data but the area to which the latest sense data is applied. Correspond. Therefore, by averaging a plurality of temporary calibration data, the latest sense data can be reflected in the calibration data over the entire detection surface.
- the mask generation unit 15 may predict the movement of the touch position not only from the sense data at two times but also from the sense data at three or more times.
- the mask area includes a predicted future touch position (time t2).
- the mask area preferably includes the predicted touch position and its peripheral area.
- the mask area does not necessarily include the current touch position (time t1) and the surrounding area.
- the mask area does not have to be a rectangle, and may be an arbitrary shape including the predicted touch position, such as an ellipse or an arbitrary polygon.
- a region centering on the predicted future touch position (32 in FIG. 7) and including at least the current touch position (22 in FIG. 7) is masked. It may be set as an area. That is, even if the mask area 23 is further expanded in the upper right direction (the direction of the motion vector) in FIG. 7B so that the predicted future touch position (32 in FIG. 7) becomes the center of the mask area. Good.
- the control block of the touch sensor control unit 3 (in particular, the signal acquisition unit 12, the signal value adjustment unit 13, the touch position detection unit 14, the mask generation unit 15, and the calibration value generation unit 16) is an integrated circuit (IC chip) or the like. It may be realized by a logic circuit (hardware) formed in the above, or may be realized by software using a CPU (Central Processing Unit).
- IC chip integrated circuit
- CPU Central Processing Unit
- the touch sensor control unit 3 includes a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by the computer (or CPU). ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it.
- a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
- the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
- a transmission medium such as a communication network or a broadcast wave
- the present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
- a touch sensor control device (touch sensor control unit 3) according to aspect 1 of the present invention is a touch sensor control device that controls a touch sensor, and specifies a touch position on a detection surface of the touch sensor.
- Touch position detection unit 14 mask setting unit (mask generation unit 15) for setting a mask area according to the touch position, and calibration of touch detection sensitivity for the area excluding the mask area on the detection surface
- a calibration unit (calibration value generation unit 16) that performs calibration.
- the mask area is set according to the touch position, and the touch detection sensitivity is calibrated for the area excluding the mask area. For this reason, the touch sensor control device can eliminate the influence of the contact and proximity of the indicator and perform appropriate calibration at a desired timing.
- the touch sensor control device includes a signal acquisition unit (signal acquisition unit 12) that acquires a sense signal from the touch sensor in the aspect 1, and the calibration unit performs calibration of detection sensitivity.
- the acquired sense signal may be used for an area excluding the mask area, and past calibration data may be used for the mask area.
- the touch sensor control device can update the calibration data using the acquired sense signal for the region excluding the mask region.
- the touch sensor control device uses the past calibration data for the mask area to eliminate the influence of the contact and proximity of the indicator and make the generated calibration data appropriate. be able to.
- the value of the sense signal corresponds to the capacitance value at each position on the detection surface.
- the mask area includes a rectangular area centered on the touch position, and the rectangular area is 3 cm ⁇ 3 cm on the detection surface.
- the structure corresponding to a square may be sufficient.
- the mask area includes a square area of at least 3 cm ⁇ 3 cm centered on the touch position. Therefore, the touch sensor control device can eliminate the influence of contact and proximity by a user's finger or stylus pen or the like in calibration.
- the mask setting unit predicts an arrival position at which the touch position reaches a certain time, and sets the mask region including the arrival position.
- the calibration unit may be configured to generate detection sensitivity calibration data by using the sense signal at the time for the region excluding the mask region.
- the calibration data is set so that the adjusted sense data has a value corresponding to the presence or absence of an indicator that is in contact with or close to the detection surface.
- a signal value adjusting unit (signal value adjusting unit 13) that generates the adjusted sense data by adjusting the value of the sense signal by using the sense position, and the touch position specifying unit is configured to detect the adjusted sense data from the adjusted sense data. Further, the touch position may be specified.
- the mask region may include the touch position.
- the calibration data corresponds to the value of the sense signal when there is no indicator that is in contact with or close to the detection surface. It may be a configuration.
- the touch panel system according to aspect 8 of the present invention may include the touch sensor control device according to aspects 1 to 7 described above and a touch panel including the touch sensor.
- An electronic information device includes a touch sensor control device according to the above aspects 1 to 7, a touch panel including the touch sensor, and a host control unit that controls the electronic information device based on the touch position. May be provided.
- the touch sensor control method includes a touch position specifying step for specifying a touch position on a detection surface of the touch sensor, a mask setting step for setting a mask area according to the touch position, and the detection A calibration step for calibrating the touch detection sensitivity with respect to the area excluding the mask area on the surface.
- the touch sensor control device may be realized by a computer.
- the touch sensor control device is operated by the computer by causing the computer to operate as each unit included in the touch sensor control device.
- a control program for the touch sensor control device to be realized and a computer-readable recording medium on which the control program is recorded also fall within the scope of the present invention.
- the present invention can be used for a touch sensor control device, a touch panel system, and an electronic information device.
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Abstract
Description
(電子情報機器の構成)
図1は、本実施形態に係る電子情報機器1の概略構成を示すブロック図である。電子情報機器1は、タッチパネル2、タッチセンサ制御部3(タッチセンサ制御装置)、およびホスト制御部4を備える。タッチパネル2およびタッチセンサ制御部3は、タッチパネルシステムを構成する。タッチパネルを備える電子情報機器1の具体例として、携帯電話機、スマートフォン、ノート型PC(personal computer)、タブレット端末、電子書籍リーダー、またはPDA(Personal Digital Assistant)、大型タッチディスプレイ、現金自動預け払い機(cash machine)等を挙げることができる。
タッチパネル2は、タッチセンサ5および表示部6を備える。本実施形態では、タッチパネル2は、静電容量方式のタッチパネルであるが、方式はこれに限定されない。
ホスト制御部4は、ホストである電子情報機器1の制御を主として行う。ホスト制御部4は、タッチセンサ制御部3が検出したタッチ位置の情報を受け取り、タッチ位置に基づいた処理を行う。また、ホスト制御部4は、表示部6に表示させる表示データを供給し、表示部6の表示制御を行う。
タッチセンサ制御部3は、タッチセンサ5を駆動し、タッチセンサ5に対する指示体のタッチ位置を検出する。タッチセンサ制御部3は、駆動部11、信号取得部12(信号取得部)、信号値調整部13(信号値調整部)、タッチ位置検出部14(タッチ位置特定部)、マスク生成部15(マスク設定部)、キャリブレーション値生成部16(キャリブレーション部)、および記憶部17を備える。
図2は、本実施形態におけるキャリブレーションデータの生成方法の概要を説明する図である。図2の(a)は、電子情報機器1のタッチパネル2の画面(検出面)に指示体7(ユーザの指)が接触している状態を示す。
図4は、本実施形態に係るキャリブレーション動作のフローを示す図である。キャリブレーション動作は、例えば電子情報機器1の起動時およびスリープ状態からの復帰時等に自動的に開始される。また、電子情報機器1の動作中の一定期間毎に自動的にキャリブレーション動作が開始されてもよい。
図5は、無指示状態における調整前のセンスデータの一例を示すグラフである。図5において、x軸は水平方向における座標を示し、y軸は垂直方向における座標を示し、z軸はセンス信号の値を示す。指示体7が接触および近接していない場合であっても、調整されていないセンスデータの値は、一般に均一ではない。この不均一性は、例えば、駆動信号線DLまたは検出信号線SLの付近に金属等の導電体が存在すること、タッチパネル2の構造上の不均一さ、または、温度分布等に起因する。図5の例では、左端の駆動信号線DLに沿った位置では、他の位置より静電容量値(すなわちセンス信号値)が大きくなっている。キャリブレーションデータを用いてセンスデータの調整を行わなければ、タッチ位置を誤認識してしまうおそれがある。
実施形態1では、N回のセンス信号の検出毎に、第M回目のセンスデータに基づいてタッチ位置およびマスク領域が特定され、第M回目のセンスデータに該マスク領域が適用される。しかしながら、タッチ位置の特定およびマスク領域の特定に時間がかかる場合、マスク領域の特定が間に合わない場合がある。すなわち、第M回目のセンスデータに基づいてマスク領域を特定したとき、次の第(M+1)回目のセンスデータの生成が行われている場合がある。そして古い(第M回目の)センスデータは、メモリの制限から消去される場合がある。指示体が移動していない場合、第M回目のセンスデータに基づいてマスク領域を第(M+1)回目のセンスデータに適用しても問題ない。しかしながら、指示体が移動している場合、該マスク領域は、第(M+1)回目のセンスデータにおけるタッチ位置をマスクできない可能性がある。
図7は、本実施形態におけるキャリブレーションデータの生成方法の概要を説明する図である。図7の(a)は、電子情報機器1のタッチパネル2の画面(検出面)に指示体7(ユーザの指)が接触している状態を示す。ここで、指示体7は、図示する矢印の方向に移動している。センス信号の検出は一定間隔(例えば1/120秒毎または1/200秒毎)で行われ、例えば時刻t0、t1、t2においてセンス信号の検出が行われる。
図8は、本実施形態に係るキャリブレーション動作のフローを示す図である。なお、時刻t1は時刻t0より後であり、時刻t2は時刻t1より後であるとする。S2、S7~S9の処理は実施形態1と同様であるので、適宜説明を省略する。
本実施形態によれば、タッチセンサ制御部3は、タッチ位置の動きを予測することで、最新のセンスデータについてのタッチ位置を予測する。タッチセンサ制御部3は、予測されたタッチ位置を含むようにマスク領域を設定する。タッチセンサ制御部3は、過去のセンスデータに基づいて決定したマスク領域を、最新のセンスデータに適用する。これにより、タッチ位置の特定およびマスク領域の特定に処理時間がかかる場合であっても、動く指示体による影響を排除して、適切にキャリブレーションを行うことができる。また、タッチ位置が移動する場合、センスデータの取得毎にマスク領域の位置が変化する。例えば、1回目の仮キャリブレーションデータにおけるマスク領域(過去のキャリブレーションデータが適用される領域)は、2回目の仮キャリブレーションデータでは、マスク領域ではなく、最新のセンスデータが適用される領域に対応する。そのため、複数の仮キャリブレーションデータを平均化することで、検出面の全体に渡って最新のセンスデータをキャリブレーションデータに反映することができる。
タッチセンサ制御部3の制御ブロック(特に、信号取得部12、信号値調整部13、タッチ位置検出部14、マスク生成部15、およびキャリブレーション値生成部16)は、集積回路(ICチップ)等に形成された論理回路(ハードウェア)によって実現してもよいし、CPU(Central Processing Unit)を用いてソフトウェアによって実現してもよい。
本発明の態様1に係るタッチセンサ制御装置(タッチセンサ制御部3)は、タッチセンサの制御を行うタッチセンサ制御装置であって、上記タッチセンサの検出面におけるタッチ位置を特定するタッチ位置特定部(タッチ位置検出部14)と、上記タッチ位置に応じてマスク領域を設定するマスク設定部(マスク生成部15)と、上記検出面における上記マスク領域を除いた領域について、タッチの検出感度のキャリブレーションを行うキャリブレーション部(キャリブレーション値生成部16)とを備える。
2 タッチパネル
3 タッチセンサ制御部
4 ホスト制御部
5 タッチセンサ
6 表示部
7 指示体
11 駆動部
12 信号取得部
13 信号値調整部
14 タッチ位置検出部(タッチ位置特定部)
15 マスク生成部(マスク設定部)
16 キャリブレーション値生成部(キャリブレーション部)
17 記憶部
22 タッチ位置
23 マスク領域
DL 駆動信号線
SL 検出信号線
Claims (5)
- タッチセンサの制御を行うタッチセンサ制御装置であって、
上記タッチセンサの検出面におけるタッチ位置を特定するタッチ位置特定部と、
上記タッチ位置に応じてマスク領域を設定するマスク設定部と、
上記検出面における上記マスク領域を除いた領域について、タッチの検出感度のキャリブレーションを行うキャリブレーション部とを備えることを特徴とするタッチセンサ制御装置。 - 上記タッチセンサからセンス信号を取得する信号取得部を備え、
上記キャリブレーション部は、検出感度のキャリブレーションデータの生成において、上記マスク領域を除いた領域については、取得された上記センス信号を使用し、上記マスク領域については、過去のキャリブレーションデータを使用することを特徴とする請求項1に記載のタッチセンサ制御装置。 - 上記マスク領域は、上記タッチ位置を中心とする矩形領域を含み、
上記矩形領域は、上記検出面における3cm×3cmの正方形に対応することを特徴とする請求項1または2に記載のタッチセンサ制御装置。 - 上記マスク設定部は、上記タッチ位置がある時刻に到達する到達位置を予測し、上記到達位置を含む上記マスク領域を設定し、
上記キャリブレーション部は、上記マスク領域を除いた領域については、該時刻の上記センス信号を使用することにより、検出感度のキャリブレーションデータを生成することを特徴とする請求項2に記載のタッチセンサ制御装置。 - 調整されたセンスデータが上記検出面に接触または近接する指示体の有無に対応した値を有するように、上記キャリブレーションデータを用いて上記センス信号の値を調整することにより、上記調整されたセンスデータを生成する信号値調整部を備え、
上記タッチ位置特定部は、上記調整されたセンスデータから、タッチ位置を特定することを特徴とする請求項2に記載のタッチセンサ制御装置。
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