Method for adjusting touch sensing signals of a touch device

Abstract

The present application provides a method for adjusting a touch sensing signal of a touch device. The adjusting method includes determining a fundamental frequency and a plurality of harmonics of the touch sensing signal according to a design of the touch device, and determining a time length of a flat region of a pulse of the touch sensing signal; setting a rising slope and a falling slope of the pulse, and combining the rising slope, the flat region and the falling slope into the touch sensing signal; measuring an electromagnetic interference result of the touch sensing signal in the touch device; and adjusting the rising slope and the falling slope of the pulse when the electromagnetic interference result does not meet a preset electromagnetic interference specification of the touch device.

Description

Technical Field

[0001] This invention relates to the technical field of touch devices, and more particularly to a method for adjusting the touch sensing signal of a touch device. Background Technology

[0002] Touch devices utilize touch sensing signals to sense touch points or touch trajectories. Current touch sensing signals include fixed waveforms such as square waves, triangular waves, or trapezoidal pulses. The swing of the touch sensing signal generates electromagnetic interference (EMI). Depending on the application, touch devices may have specific EMI specifications. However, due to the design of touch devices, the touch sensing signal can generate harmonic interference at different frequencies. Such harmonic interference may interfere with components within the touch device (such as the display module) or peripheral devices. Therefore, providing a method for adjusting the touch sensing signal to reduce harmonic interference and comply with the EMI specifications of different touch devices is a key research focus for those skilled in the art. Summary of the Invention

[0003] This invention provides a method for adjusting the touch sensing signal of a touch device, which can reduce harmonic interference of the touch device.

[0004] The method for adjusting the touch sensing signal of the touch device of the present invention includes: determining the fundamental frequency and multiple harmonics of the touch sensing signal according to the design of the touch device, and determining the time length of the flat region of the pulse of the touch sensing signal; setting the rising ramp and falling ramp of the pulse according to the multiple harmonics, and combining the rising ramp, the flat region and the falling ramp into the touch sensing signal; measuring the electromagnetic interference result of the touch sensing signal in the touch device; and adjusting the rising ramp and falling ramp of the pulse when the electromagnetic interference result does not meet the preset electromagnetic interference specification of the touch device.

[0005] Based on the above, the adjustment method of the present invention sets the rising and falling ramps of the pulse wave according to the plurality of harmonics and generates a touch sensing signal. Furthermore, when the electromagnetic interference result does not meet the preset electromagnetic interference specifications of the touch device, the rising and falling ramps of the pulse wave are adjusted. The adjustment method sets or adjusts the waveform of the touch sensing signal based on the fundamental frequency, the plurality of harmonics, and the preset electromagnetic interference specifications. In this way, harmonic interference caused by the touch sensing signal can be suppressed according to the requirements of the touch device.

[0006] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of an adjustment system according to an embodiment of the present invention;

[0008] Figure 2 This is a flowchart of the adjustment method according to the first embodiment of the present invention;

[0009] Figure 3 This is a flowchart of the adjustment method according to the second embodiment of the present invention;

[0010] Figure 4A This is a waveform diagram of a touch sensing signal having a first pulse, according to an embodiment of the present invention.

[0011] Figure 4B This is another waveform diagram of a touch sensing signal having a first pulse, according to an embodiment of the present invention;

[0012] Figure 5A This is a waveform diagram of a touch sensing signal with a second pulse, according to an embodiment of the present invention.

[0013] Figure 5B This is another waveform diagram of a touch sensing signal with a second pulse, according to an embodiment of the present invention.

[0014] Figure 6 This is a comparison diagram of the responses of a trapezoidal pulse, a first pulse, and a second pulse, according to an embodiment of the present invention.

[0015] Figure 7 This is a flowchart of the adjustment method according to the third embodiment of the present invention;

[0016] Figure 8 This is a schematic diagram of different pulse waves according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures

[0018] 100: Adjust the system

[0019] 110: Controller

[0020] 120: Sensors

[0021] A1~A4: Angle range

[0022] BF: Baseband

[0023] DE: Preset Electromagnetic Interference Standards

[0024] DS: Descending ramp

[0025] HW1~HWn: Harmonics

[0026] I: Intensity

[0027] PL: Flat area

[0028] PW1: First pulse wave

[0029] PW2: Second pulse

[0030] PWA~PWH: Pulse Wave

[0031] PWT: Trapezoidal pulse wave

[0032] REMI: Electromagnetic Interference Results

[0033] RS: Rising Slope Wave

[0034] S1~S3: First slope

[0035] S100, S200, S300: Adjustment Method

[0036] S110~S150: Steps

[0037] S210~S260: Steps

[0038] S310, S311, S312, S320, S330, S340, S350, S351, S352: Steps

[0039] S4~S6: Second slope

[0040] ST: Touch sensing signal

[0041] t: time

[0042] TB: Time Range

[0043] TD: Touchscreen device

[0044] TT1, TT2: During touch sensing

[0045] V: Voltage Detailed Implementation

[0046] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same component reference numerals are used in the drawings and description to denote the same or similar parts.

[0047] Please also refer to Figure 1 as well as Figure 2 , Figure 1 This is a schematic diagram of an adjustment system according to an embodiment of the present invention. Figure 2This is a flowchart of an adjustment method according to a first embodiment of the present invention. In this embodiment, adjustment method S100 is, for example, applicable to adjustment system 100. Adjustment system 100 is used to adjust the touch sensing signal ST applicable to the touch device TD. In this embodiment, adjustment method S100 includes steps S110 to S150. In step S110, adjustment system 100 determines the fundamental frequency BF and harmonics HW1 to HWn of touch sensing signal ST according to the design of touch device TD, and determines the time length of the flat region PL of pulse PW of touch sensing signal ST. In this embodiment, adjustment system 100 includes controller 110 and sensor 120. Controller 110 obtains the touch sensing signal according to the design of touch device TD. Therefore, controller 110, for example, knows the fundamental frequency BF of touch sensing signal ST required by touch device TD. When the fundamental frequency BF is known, the harmonics HW1 to HWn are also known. The frequencies of harmonics HW1 to HWn are respectively equal to different integer multiples of the fundamental frequency. For example, the touch device TD is an automotive touch display panel. The fundamental frequency BF of the touch sensing signal ST is 25kHz. Harmonic HW1 is the third harmonic of the fundamental frequency BF. Harmonic HW2 is the fifth harmonic of the fundamental frequency BF, and so on. Therefore, the frequency of harmonic HW1 is 75kHz. The frequency of harmonic HW2 is 125kHz. Furthermore, the controller 110 determines the duration of the flat region PL of the pulse PW by knowing, for example, the circuit impedance, capacitance, and circuit response speed of the touch panel of the touch device TD. The circuit impedance and capacitance affect the circuit response speed of the touch panel of the touch device TD. Therefore, the duration of the flat region PL of the pulse PW is negatively correlated with the circuit response speed of the touch panel of the touch device TD. Based on the circuit response speed, the actual duration of the flat region PL can be greater than or equal to 0.

[0048] In step S120, the adjustment system 100 sets the rising ramp RS and falling ramp DS of the pulse PW according to the harmonics HW1~HWn. The adjustment system 100 combines the rising ramp RS, the flat region PL, and the falling ramp DS into a touch sensing signal ST. In this embodiment, different slopes of the rising ramp RS and the falling ramp DS suppress the intensity of a corresponding harmonic HW1~HWn. Therefore, when the frequencies of the harmonics HW1~HWn are determined, the controller 110 sets at least one rising slope of the rising ramp RS and at least one falling slope of the falling ramp DS to suppress the intensity of at least one of the harmonics HW1~HWn. Furthermore, after at least one rising slope of the rising ramp RS and at least one falling slope of the falling ramp DS are set, the controller 110 combines the rising ramp RS, the flat region PL, and the falling ramp DS into a touch sensing signal ST. In this embodiment, the flat region PL immediately follows the rising ramp RS. The descending ramp DS immediately follows the flat region PL.

[0049] In step S130, the adjustment system 100 measures the electromagnetic interference result REMI of the touch sensing signal ST at the touch device TD. In this embodiment, the controller 110 provides the touch sensing signal ST to the touch device TD. The sensor 120 receives the electromagnetic interference result REMI generated by the touch device TD in response to the touch sensing signal ST. Furthermore, the sensor 120 provides the electromagnetic interference result REMI to the controller 110.

[0050] In step S140, the controller 110 determines whether the electromagnetic interference result REMI conforms to the preset electromagnetic interference specification DE of the touch device TD. When the electromagnetic interference result REMI does not conform to the preset electromagnetic interference specification DE, it means that the intensity of at least one of the harmonics HW1~HWn is greater than the intensity specified by the preset electromagnetic interference specification DE. Therefore, in step S150, the controller 110 adjusts the rising ramp RS and falling ramp DS of the pulse PW.

[0051] On the other hand, when the electromagnetic interference result REMI conforms to the preset electromagnetic interference specification DE, it means that the intensity of harmonics HW1~HWn is less than the intensity specified by the preset electromagnetic interference specification DE. Therefore, the adjustment method S100 ends.

[0052] It is worth mentioning that adjustment method S100 sets the rising ramp RS and falling ramp DS of pulse PW based on harmonics HW1~HWn and generates touch sensing signal ST. When the electromagnetic interference result REMI does not meet the preset electromagnetic interference specification DE of touch device TD, the rising ramp RS and falling ramp DS of pulse PW are adjusted. Adjustment method S100 sets or adjusts the waveform of touch sensing signal ST based on fundamental frequency BF, harmonics HW1~HWn and preset electromagnetic interference specification DE. In this way, harmonic interference caused by touch sensing signal ST can be suppressed according to the requirements of touch device TD.

[0053] In this embodiment, the touch device TD can be a touch display device, touchpad, stylus, or fingerprint recognition device used in various systems or electronic devices. Depending on the application, the preset electromagnetic interference standard DE will also differ. Therefore, the harmonics HW1~HWn that need to be suppressed will also differ.

[0054] In some embodiments, at least one of the controller 110 and the sensor 120 may be built into the touch device TD. For example, the controller 110 may be located in a Touch and Display Driver Integration (TDDI) chip or a touch driver unit, and the sensor 120 may be located outside the touch display chip or touch driver unit.

[0055] Please also refer to Figure 1 as well as Figure 3 , Figure 3 This is a flowchart of the adjustment method according to the second embodiment of the present invention. In this embodiment, the adjustment method S200 includes steps S210 to S260. The touch device TD in this embodiment is a touch display device. Implementation details of steps S210 and S220 are already provided. Figure 1 as well as Figure 2 The embodiments are clearly illustrated and will not be repeated here. In step S230, sensor 120 measures the electromagnetic interference result REMI of the touch display chip of the touch device TD during touch sensing.

[0056] In step S240, the controller 110 determines whether the electromagnetic interference result REMI conforms to the preset electromagnetic interference specification DE of the touch device TD. When the electromagnetic interference result REMI does not conform to the preset electromagnetic interference specification DE, the controller 110 adjusts the rising ramp RS and falling ramp DS of the pulse PW in step S250.

[0057] On the other hand, when the electromagnetic interference result REMI meets the preset electromagnetic interference specification DE, the sensor 120 will further measure the electromagnetic interference result of the touch device TD in the overall environment in step S260. The operation of step S260 and the subsequent adjustment of the rising ramp RS and falling ramp DS are similar to the operation of steps S140 and S150 of the adjustment method S100, and therefore will not be repeated here.

[0058] The following section will further explain the different states of the touch sensing signal ST.

[0059] Please refer to Figure 4A , Figure 4AThis is a waveform diagram of a touch sensing signal with a first pulse wave according to an embodiment of the present invention. In this embodiment, the touch sensing signal ST1 has a first pulse wave PW1 during touch sensing periods TT1 and TT2. The first pulse wave PW1 includes a rising ramp wave RS, a flat region PL, and a falling ramp wave DS. The rising ramp wave RS of the first pulse wave PW1 is a first sine wave. The falling ramp wave DS of the first pulse wave PW1 is a second sine wave. Taking this embodiment as an example, the rising ramp wave RS of the first pulse wave PW1 is a first sine wave. The falling ramp wave DS of the first pulse wave PW1 is a second sine wave. Further, the angle range A1 of the first sine wave is greater than -90° and less than 90°. The angle range A2 of the second sine wave is greater than 90° and less than 270°. For example, the first pulse wave PW1 may start from an angle of -80°, and the first pulse wave PW1 may enter the flat region PL when it reaches, for example, 80°. The rising ramp wave RS may start from, for example, an angle of 100° and end when it reaches, for example, 260°. In other words, the first pulse PW1 is clamped into a flat region PL in the angular range of greater than 80° and less than 100°.

[0060] In this embodiment, the time interval TB lies between the touch sensing periods TT1 and TT2. The time interval TB is the period during which the touch sensing signal ST1 is not provided. The time interval TB may be, for example, the display period. In some embodiments, the time interval TB may be ignored.

[0061] Please refer to Figure 4B , Figure 4B This is another waveform diagram of a touch sensing signal with a first pulse, according to an embodiment of the present invention. In this embodiment, the touch sensing signal ST1 has a first pulse PW1 during touch sensing periods TT1 and TT2. The first pulse PW1 includes a rising ramp RS, a flat region PL, and a falling ramp DS. Taking this embodiment as an example, the rising ramp RS of the first pulse PW1 is a first cosine wave. The falling ramp DS of the first pulse PW1 is a second cosine wave. Further, the angle range A3 of the first cosine wave is greater than or equal to -180° and less than or equal to 0°. The angle range A4 of the second cosine wave is greater than or equal to 0° and less than or equal to 180°. For example, the first pulse PW1 starts from an angle of -180°, and the first pulse PW1, for example, reaches 0° and enters the flat region PL. The falling ramp DS, for example, starts from an angle of 0° and enters another flat region, for example, reaching 180°.

[0062] Please refer to Figure 5A , Figure 5AThis is a waveform diagram of a touch sensing signal with a second pulse wave according to an embodiment of the present invention. In this embodiment, the touch sensing signal ST2 has a second pulse wave PW2 during touch sensing periods TT1 and TT2. The second pulse wave PW2 includes a rising ramp wave RS, a flat region PL, and a falling ramp wave DS. The rising ramp wave RS of the second pulse wave PW2 has a first slope S1 to S3. The first slope S1 is called the first segment slope. The first slope S2 is called the second segment slope. The first slope S3 is called the third segment slope. In terms of timing, the first slope S2 is located between the first slopes S1 and S3. The falling ramp wave DS of the second pulse wave PW2 has a second slope S4 to S6. The second slope S4 is called the fourth segment slope. The second slope S5 is called the fifth segment slope. The second slope S6 is called the sixth segment slope. In terms of timing, the second slope S5 is located between the second slopes S4 and S6. The first slopes S1 to S3 are all slopes greater than 0. The first slopes S1 to S3 are not completely identical. In this embodiment, the first slope S2 is different from the first slopes S1 and S3. The second slopes S4 to S6 are all slopes less than 0. The second slopes S4 to S6 are not entirely the same. In this embodiment, the second slope S5 is different from the second slopes S4 and S6. For example, the first slope S2 is greater than the first slopes S1 and S3. The absolute value of the second slope S5 is greater than the absolute values ​​of the second slopes S4 and S6. Furthermore, the first slope S1 is approximately equal to the absolute value of the second slope S4. The first slope S2 is approximately equal to the absolute value of the second slope S5. The first slope S3 is approximately equal to the absolute value of the second slope S6.

[0063] For ease of explanation, this embodiment uses three first slopes S1~S3 and three second slopes S4~S6 as examples. However, the present invention is not limited to the number of first slopes and the number of second slopes. The present invention can have multiple first slopes and multiple second slopes.

[0064] Please refer to Figure 5B , Figure 5B This is another waveform diagram of a touch sensing signal with a second pulse, according to an embodiment of the present invention. In this embodiment, the touch sensing signal ST2 has a second pulse PW2 during touch sensing of TT1 and TT2. The second pulse PW2 includes a rising ramp RS, a flat region PL, and a falling ramp DS. The rising ramp RS of the second pulse PW2 has a first slope S1 to S3. The falling ramp DS of the second pulse PW2 has a second slope S4 to S6. The first slopes S1 to S3 are all greater than 0. The first slopes S1 to S3 are not all the same. The second slopes S4 to S6 are all less than 0. The second slopes S4 to S6 are not all the same. For example, in this embodiment, the first slope S2 is less than the first slopes S1 and S3. The absolute value of the second slope S5 is less than the absolute values ​​of the second slopes S4 and S6.

[0065] Please also refer to Figure 1 as well as Figure 6 In this embodiment, Figure 6 This is a comparison diagram of the responses of a trapezoidal pulse, a first pulse, and a second pulse, according to an embodiment of the present invention. Figure 6 The waveforms of trapezoidal pulse PWT, first pulse PW1, and second pulse PW2, as well as the response results of these pulses, are shown. The vertical axis of the waveforms for trapezoidal pulse PWT, first pulse PW1, and second pulse PW2 represents the voltage value, measured in volts (volts). The horizontal axis represents time t, measured in seconds. The vertical axis of the response results for trapezoidal pulse PWT, first pulse PW1, and second pulse PW2 represents the intensity I, measured in decibels (dB). The horizontal axis represents the frequency f, measured in kHz.

[0066] The waveforms of the first pulse PW1 and the second pulse PW2 have already been... Figure 4A , Figure 4B , Figure 5A , Figure 5B Detailed explanations are omitted here. In this embodiment, Figure 6 The fundamental frequency (BF) and multiple harmonics are shown. These harmonics include at least the third harmonic (HW1) and the fifth harmonic (HW2) of the fundamental frequency (BF). In this embodiment, the fundamental frequency (BF) is, for example, 25 kHz. The third harmonic (HW1) is 75 kHz. The fifth harmonic (HW2) is 125 kHz. The touch device TD generates a first third harmonic intensity (approximately -34.11 dB) of the third harmonic (HW1) and a first fifth harmonic intensity (approximately -35.57 dB) of the fifth harmonic (HW2) based on electromagnetic interference from a touch sensing signal ST with a first pulse (PW1). The touch device TD generates a third third harmonic intensity (approximately -17.19 dB) of the third harmonic (HW1) and a third fifth harmonic intensity (approximately -28.07 dB) of the fifth harmonic (HW2) based on electromagnetic interference from a touch sensing signal ST with a trapezoidal pulse (PWT). The first third harmonic intensity is less than the third third harmonic intensity. The intensity of the first fifth harmonic is less than that of the third fifth harmonic. In other words, the touch sensing signal ST with the first pulse PW1 can suppress the third harmonic HW1 and the fifth harmonic HW2.

[0067] The touch device TD generates a second-third harmonic intensity (approximately -47.20 dB) of the third harmonic HW1 and a second-fifth harmonic intensity (approximately -34.75 dB) of the fifth harmonic HW2 based on electromagnetic interference from the touch sensing signal ST with a second pulse PW2. The second-third harmonic intensity is less than the third-third harmonic intensity. The second-fifth harmonic intensity is less than the third-fifth harmonic intensity. In other words, the touch sensing signal ST with the second pulse PW2 can also suppress the third harmonic HW1 and the fifth harmonic HW2.

[0068] Furthermore, based on different preset electromagnetic interference (EMI) standards (DE), one of the first pulse PW1 and the second pulse PW2 can be selected. For example, if the preset EMI standard DE indicates that the third harmonic intensity is less than -20 dB, then either the first pulse PW1 or the second pulse PW2 can be selected. As another example, if the preset EMI standard DE indicates that the third harmonic intensity is less than -40 dB, then the second pulse PW2 can be selected.

[0069] Please also refer to Figure 1 , Figure 2 as well as Figure 6 In this embodiment, in step S120, the controller 110 sets the pulse PW to one of the first pulse PW1 and the second pulse PW2. In step S150, the controller 110 adjusts the rising ramp RS and falling ramp DS of the pulse PW set in step S120, or sets the pulse PW to the other of the first pulse PW1 and the second pulse PW2.

[0070] Please also refer to Figure 1 , Figure 6 as well as Figure 7 , Figure 7 This is a flowchart of the adjustment method according to the third embodiment of the present invention. In this embodiment, the adjustment method S300 includes steps S310 to S350. Similar to step S110, in step S310, the adjustment system 100 determines the fundamental frequency BF and harmonics HW1 to HWn of the touch sensing signal ST based on the design of the touch device TD, and determines the duration of the flat region PL of the pulse PW of the touch sensing signal ST. Further, step S310 includes steps S311 and S312. In step S311, the controller 110 determines the fundamental frequency BF and harmonics HW1 to HWn of the touch sensing signal ST based on a preset electromagnetic interference specification. In step S312, the controller 110 determines the duration of the flat region PL of the pulse PW of the touch sensing signal ST based on the response speed of the touch device TD.

[0071] In this embodiment, the controller 110 preferentially selects the first pulse PW1 in step S320. The duration of the flat region PL of the first pulse PW1 is the duration determined in step S312. In this embodiment, since the waveform of the second pulse PW2 has a more obvious voltage transition compared to the waveform of the first pulse PW1, a more obvious voltage transition will generate a larger harmonic intensity in the high-frequency band. Therefore, in the initial stage of adjustment, the controller 110 will preferentially select the first pulse PW1.

[0072] In step S330, sensor 120 measures the electromagnetic interference result REMI of the touch sensing signal ST at the touch device TD. Sensor 120 also provides the electromagnetic interference result REMI to controller 110.

[0073] In step S340, the controller 110 determines whether the electromagnetic interference result REMI conforms to the preset electromagnetic interference specification DE of the touch device TD. When the electromagnetic interference result REMI does not conform to the preset electromagnetic interference specification DE, it means that the intensity of at least one of the harmonics HW1~HWn is greater than the intensity specified by the preset electromagnetic interference specification DE. Therefore, the controller 110 adjusts the waveform of the first pulse PW1 in step S350.

[0074] Step S350 includes steps S351 and S352. In step S351, the controller 110 analyzes and simulates the frequency response of the touch sensing signal to obtain optimized multiple first slopes (such as...). Figure 5A , Figure 5B The first slope (S1~S3) and multiple second slopes (such as...) are shown. Figure 5A , Figure 5B The second slopes S4-S6 are shown. In step S352, the controller 110 selects an optimized plurality of first slopes and a plurality of second slopes to generate a second pulse PW2. In other words, the controller 110 sets the pulse PW as the second pulse PW2 in step S350.

[0075] The implementation of step S351 will be further explained below. Please refer to [link / reference]. Figure 8 , Figure 8 This is a schematic diagram illustrating different pulse waves according to an embodiment of the present invention. In this embodiment, Figure 8 The pulses PWA to PWH are shown, each with a different rising and falling ramp. The rising and falling ramps of the pulses PWA to PWH are distinct from each other.

[0076] The rising and falling slopes of a pulse wave PWA have the smallest absolute values ​​of slope. A pulse wave PWA is, for example, a triangular wave. The rising and falling slopes of a pulse wave PWB have greater absolute values ​​of slope than those of a pulse wave PWA. A pulse wave PWB is, for example, a trapezoidal wave. The rising and falling slopes of a pulse wave PWC have greater absolute values ​​of slope than those of a pulse wave PWB. And so on. The rising and falling slopes of a pulse wave PWH have the largest slope. A pulse wave PWH is, for example, a square wave.

[0077] It should be noted that pulses with different slopes can suppress specific harmonics. Please also refer to... Figure 8 And Table 1. Table 1 shows the results of harmonic suppression by pulses PWA~PWH. The values ​​in Table 1 are in dB. The fundamental frequency BF is 25 kHz. The frequency of the third harmonic is 75 kHz. The frequency of the fifth harmonic is 125 kHz. The frequency of the fifth harmonic is 175 kHz.

[0078] Table 1:

[0079]

[0080] In Table 1, the PWE pulse exhibits the best suppression effect for the third harmonic. The PWC pulse exhibits the best suppression effect for the fifth harmonic. Different slopes can effectively suppress harmonics of different multiples. Therefore, pulses with multiple slopes can more flexibly distribute the suppression effect of each harmonic and can meet the requirements of different electromagnetic interference specifications as needed.

[0081] In summary, the adjustment method of the present invention sets the rising and falling ramps of the pulse wave based on the plurality of harmonics to generate a touch sensing signal. Furthermore, when the electromagnetic interference result does not conform to the preset electromagnetic interference specifications of the touch device, the rising and falling ramps of the pulse wave are adjusted. The adjustment method of the present invention sets or adjusts the waveform of the touch sensing signal based on the fundamental frequency, the plurality of harmonics, and the preset electromagnetic interference specifications. Based on the design and requirements of the touch device, harmonic interference caused by the touch sensing signal can be suppressed.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adjusting the touch sensing signal of a touch device, characterized in that, The adjustment method includes: The fundamental frequency and multiple harmonics of the touch sensing signal are determined based on the design of the touch device, and the time length of the flat region of the pulse of the touch sensing signal is determined. The rising ramp and falling ramp of the pulse are set according to the multiple harmonics, and the rising ramp, the flat area and the falling ramp are combined into the touch sensing signal; The electromagnetic interference results of the touch sensing signal in the touch device are measured; and When the electromagnetic interference result does not meet the preset electromagnetic interference specification of the touch device, the rising ramp and the falling ramp of the pulse are adjusted. The step of setting the rising ramp and the falling ramp of the pulse based on the multiple harmonics and combining the rising ramp, the flat area, and the falling ramp into the touch sensing signal includes: The pulse wave is set to one of the first pulse wave and the second pulse wave. The rising slope wave of the first pulse is the first sine wave. The descending slope of the first pulse wave is the second sine wave. The rising slope of the second pulse has multiple first slopes, and The second pulse wave has a descending ramp with multiple second slopes.

2. The adjustment method according to claim 1, characterized in that, The steps of determining the fundamental frequency and multiple harmonics of the touch sensing signal based on the design of the touch device, and determining the time length of the flat region of the pulse of the touch sensing signal, include: The fundamental frequency and multiple harmonics of the touch sensing signal are determined according to the preset electromagnetic interference standard.

3. The adjustment method according to claim 1, characterized in that, The steps of determining the fundamental frequency and multiple harmonics of the touch sensing signal based on the design of the touch device, and determining the time length of the flat region of the pulse of the touch sensing signal, include: The duration of the flat region of the pulse of the touch sensing signal is determined based on the response speed of the touch device.

4. The adjustment method according to claim 1, characterized in that, The frequencies of the plurality of harmonics are each equal to different integer multiples of the fundamental frequency.

5. The adjustment method according to claim 1, characterized in that: The flat region immediately follows the rising ramp, and The descending ramp immediately follows the flat region.

6. The adjustment method according to claim 1, characterized in that, The plurality of first slopes and the plurality of second slopes are not exactly the same.

7. The adjustment method according to claim 1, characterized in that: The plurality of first slopes includes a first slope, a second slope, and a third slope. The plurality of second slopes includes a fourth slope, a fifth slope, and a sixth slope. The second slope is located between the first slope and the third slope, and is different from both the first slope and the third slope. The fifth slope is located between the fourth slope and the sixth slope, and is different from both the fourth slope and the sixth slope.

8. The adjustment method according to claim 1, characterized in that: The rising slope wave is the first sine wave. The descending ramp wave is a second sine wave. The angle range of the first sine wave is greater than -90° and less than 90°, and The angle range of the second sine wave is greater than 90° and less than 270°.

9. The adjustment method according to claim 1, characterized in that: The rising slope wave is a first cosine wave. The rising slope wave is a second cosine wave. The angle range of the first cosine wave is greater than or equal to -180° and less than or equal to 0°, and The angle range of the second cosine wave is greater than or equal to 0° and less than or equal to 180°.

10. The adjustment method according to claim 9, characterized in that, When 0° is reached, the first pulse enters the flat region.

11. The adjustment method according to claim 1, characterized in that, The step of setting the pulse wave to one of the first pulse wave and the second pulse wave includes: The pulse wave is preferentially set to the first pulse wave. The plurality of harmonics includes at least the third harmonic of the fundamental frequency and the fifth harmonic of the fundamental frequency, and The touch device generates the first third harmonic intensity of the third harmonic and the first fifth harmonic intensity of the fifth harmonic based on the electromagnetic interference of the touch sensing signal having the first pulse.

12. The adjustment method according to claim 11, characterized in that, The intensity of the first and third harmonics is less than -30dB.

13. The adjustment method according to claim 11, characterized in that, The intensity of the first fifth harmonic is less than -30dB.

14. The adjustment method according to claim 11, characterized in that, When the electromagnetic interference result does not meet the preset electromagnetic interference specification of the touch device, the steps of adjusting the rising ramp and the falling ramp of the pulse include: Set the pulse wave to the second pulse wave.

15. The adjustment method according to claim 14, characterized in that: The touch device generates the second-third harmonic intensity of the third harmonic and the second-fifth harmonic intensity of the fifth harmonic based on the electromagnetic interference of the touch sensing signal having the second pulse. The intensity of the second third harmonic is less than that of the first third harmonic.

16. The adjustment method according to claim 14, characterized in that, The adjustment method further includes: The frequency response of the touch sensing signal is analyzed and simulated to obtain the optimized plurality of first slopes and the plurality of second slopes.

17. The adjustment method according to claim 14, characterized in that, The step of setting the pulse wave as the second pulse wave includes: The optimized plurality of first slopes and the plurality of second slopes are selected to generate the second pulse.

18. The adjustment method according to claim 1, characterized in that, The time length of the flat region is greater than or equal to 0.

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