TWI533178B - Background signal processing methods and systems - Google Patents

Description

Background signal processing method and system

A background signal processing technique, more specifically, is a touch panel background signal processing method and system.

Generally speaking, for a touch panel, especially a panel using a capacitive touch technology, filtering background noise is a necessary step in the process of capturing signals by the sensor, and the background noise can be accurately filtered. Identify the presence of the signal and avoid signal distortion. In most practical situations, the background noise of the sensor is not fixed. Therefore, it is necessary to periodically detect background noise and update the known background noise value to ensure the quality of the captured signal.

However, as the size of the touch panel increases or the precision demand increases, the number of sensors on the touch panel must also increase, and the burden of periodically detecting and updating the background noise is also aggravated. Further, if the background noise update is frequently performed in a situation where the system cannot be afforded, the negative influence of the reading frequency is reduced, and the operation of the touch panel cannot be satisfied, for example, in sensing the continuous touch signal. The signal that was sensed was interrupted.

Updating the background noise too low will cause the signal to be distorted; unable to load the background noise update will affect the signal reading, therefore, how to provide a way to reduce the burden of background noise update and increase the quality of the captured signal Update speed to improve signal reading frequency Technology has become an urgent issue in the industry.

In order to solve the problems of the prior art, the present invention provides a background signal processing method and system for reducing the burden of updating the background signal and increasing the update speed, thereby improving the frequency of reading the touch signal, while ensuring the quality of the captured signal. .

A background signal processing method provided by the present invention is applied to a sensing device having a plurality of wires, the sensing device includes a preset plurality of background signal standard threshold values and background substrate signal values, and the background signal processing method includes The following steps: detecting, from the nth wire, the first background signal measurement value of the first wire group of the plurality of wires, wherein n is a positive integer; determining the first background Whether the signal measurement value is the default threshold value of the first background signal, if yes, the step is ended, and if not, it is determined whether the first background signal measurement value is allowed to meet the preset second background signal standard threshold value. And if yes, performing an update of the background signal, if not, detecting the second background signal measurement of the second one of the plurality of wires from the n+mth wire at intervals of the first wire number Wherein, m is a positive integer; and calculating the plurality of wires other than the first wire group and the second wire group according to the first background signal measurement value and the second background signal measurement value Background signal group of three conductors, in order to obtain the estimated value of the background signal.

The background signal processing system provided by the present invention is applied to a sensing device having a plurality of wires, the sensing device includes a preset plurality of background signal standard threshold values and background substrate signal values, and the background signal processing system includes The storage unit is configured to store the threshold value of the background signal; the measuring unit is configured to detect the background signal measurement value of the plurality of wires; and the determining module is configured to determine the background signal measurement value Whether to allow the background signal The threshold is depreciated.

Compared with a conventional technique for measuring the background signal of all the wires, the present invention provides a background signal processing method and system for measuring the first background signal amount by first measuring a portion of the first wire group of all the wires. Measure the value and determine whether further action is required according to the first background signal measurement value. If the first background signal standard threshold value is allowed, the difference between the current background signal and the background substrate signal value is negligible, and the remaining The detection step greatly simplifies the background signal update step and reduces the burden.

If further action is required, the update or further measurement is determined according to the first background signal measurement value: if the first background signal measurement value satisfies the second background signal standard threshold value, the background signal is directly updated; If not, the second set of conductors is measured to obtain a more detailed value, and the measured second background signal measurement value and the previously measured first background signal measurement value are calculated. In the plurality of wires, the background signal estimation value of the first wire group and the third wire group other than the second wire group, by setting a threshold value, selecting an appropriate number of measurement wires, and calculating the remaining unmeasured wires The signal speculation value provides a complete background signal, so it can reduce the burden of updating the background signal while taking care of the quality of the signal.

A ₁ ~A ₉ ‧‧‧ wire

B ₁ ~B ₉ ‧‧‧Wire

S1~S7‧‧‧ steps

S7’‧‧‧ steps

1‧‧‧Background signal processing system

10‧‧‧ storage unit

11‧‧‧Measurement unit

12‧‧‧Judgement module

13‧‧‧Processing unit

14‧‧‧Computation Module

1 is a schematic diagram of a wire arrangement of a background signal processing method and system to which the present invention is applied; FIG. 2 is a flowchart of a background signal processing method of the present invention; and FIG. 3 is another background signal processing method of the present invention. The flowchart of the embodiment; and FIG. 4 is a schematic diagram of the architecture of the background signal processing system of the present invention.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can readily appreciate the other advantages and advantages of the present invention. The present invention may be embodied or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention.

Please refer to FIG. 1 , which is a schematic view of a wire arrangement according to a first embodiment of the present invention. The background signal processing method of the present invention can be applied to a sensing device having a plurality of wires, such as a sensing device of a touch panel, in particular, a touch panel using a capacitive sensing technology. For the arrangement of the plurality of wires of the sensing device, two sets of wire groups arranged orthogonally to each other can be used, and two sets of wire wires each having 9 wires are taken as an example. As shown in FIG. 1, the wires located in the row are A ₁ ~ A ₉ , the wires in the column are B ₁ ~ B ₉ , and each wire can have two functions of driving and sensing.

In one embodiment, the capacitive sensing technology is used to determine the address of the touch signal. The method of sensing the capacitance can be divided into the self-capacitance and the mutual capacitance of the measuring wire. Taking the wire arrangement of FIG. 1 as an example, when measuring the wire When the self-capacitance of A ₁ ~A ₉ is not, the wires B ₁ ~B ₉ are not driven, and the sensing functions of A ₁ ~A ₉ are respectively used to sense the self-capacitance; when measuring the mutual capacitance, first for the wire A ₁ , in order Drive the wires B ₁ ~B ₉ and use the sensing function of A ₁ to sense the mutual capacitance for the wires B ₁ ~B ₉ , and then perform the same steps for the wires A ₂ ~A ₉ respectively to obtain the wires A ₁ ~ A _{9 has} a mutual capacitance to the wires B ₁ to B ₉ , and so on. The background signal processing method and system of the present invention can be simultaneously applied to the measurement methods of self-capacitance and mutual capacitance.

The sensing device may have a preset plurality of background signal standard threshold values. In an embodiment, the sensing device is implemented in an environment that is insulated from electromagnetic compatibility (EMC). After multiple comprehensive background signal measurements (for example, 10 to 30 times), a set of background signal values are obtained statistically, including the average value of the background signal and the standard deviation, etc., as a background signal update. Base, and determining, according to the background signal value of the background, the preset threshold values of the plurality of background signals. For example, the plurality of threshold values may be absolute values of the two standard deviation values of the background signal value or The absolute value of multiple standard deviation values.

Please refer to FIG. 2, which is a flow chart of the background signal processing method of the present invention. A background signal processing method of the present invention includes the following steps: (S1) detecting, from the nth wire, a first background signal measurement value of the first wire group of the plurality of wires at intervals of the first wire number, Wherein, n is a positive integer; (S2) determining whether the first background signal measurement value is allowed to be a preset first background signal standard threshold value, and if so, ending the step, if not, proceeding to step (S3) (S3) determining whether the first background signal measurement value corresponds to the preset second background signal standard threshold value, and if yes, proceeding to step (S4), and if not, proceeding to step (S5); (S4) Performing an update of the background signal; (S5) detecting, from the n+mth line, a second background signal measurement value of the second one of the plurality of wires at the interval of the first wire, wherein a positive integer; and (S6) calculating, according to the first background signal measurement value and the second background signal measurement value, the first wire group and the second wire group The background signal of the three wire sets to obtain the background signal estimate.

In the step (S1) described, n is a positive integer. Please refer to Figure 1 and Figure 2 at the same time. Take two sets of wires with 9 wires as an example. As shown in Figure 1, when measuring wires A ₁ ~ A ₉ , let n = 1, meaning Starting from the wire A ₁ and detecting the wires A ₁ -A ₉ at the interval of the first wire (for example, 4), that is, measuring the wires A ₁ , A ₅ and A ₉ , which is the first wire group, thereby obtaining the first wire group A background signal measurement.

In the step (S2), determining whether the first background signal measurement value corresponds to the preset first background signal standard threshold value, to determine the current first background signal measurement value and the background base signal. Whether the difference between the two exceeds the preset allowable range. In an embodiment, the threshold value of the first background signal may be an absolute value of two standard deviation values of the background signal value, and the first background signal measurement value is a threshold value of the first background signal. The absolute value of the first background signal measurement value is less than the threshold value of the first background signal. If the condition is met, the difference between the background signal value and the background signal value is still within the preset tolerance range, and no update is needed. Or other further actions, so the end step can enter the detection mode of the touch signal; if the condition is not allowed, indicating that the difference between the background signal value and the background signal value exceeds the preset allowable range, then the step is required. (S3).

In the step (S3), it is determined whether the first background signal measurement value corresponds to the preset second background signal standard threshold value, so as to determine that the further action is to directly update or measure more wires. In an embodiment, the threshold value of the second background signal may be an absolute value of three or more standard deviation values of the background signal value, and the first background signal measurement value corresponds to the second background. The standard threshold value of the signal indicates that the absolute value of the first background signal measurement value is less than the threshold value of the second background signal. If the condition is met, the background signal can be directly updated, and the process proceeds to step (S4); If the difference between the background signal value and the background signal value exceeds the preset allowable range, the process proceeds to step (S5).

In the step (S4), the background signal value is corrected according to the first background signal measurement value, and all the background signals of the sensing device are updated, and then the detection mode of the touch signal is entered.

In the said step (S5), m is a positive integer, for example 2, as shown in FIG. 1, in the embodiment of n = 1, n + m from the first meaning of wires from wire A ₃ starting from Detecting the wires A ₁ ~A ₉ at the interval of the first wire (for example, 4), that is, detecting the wires A ₃ and A ₇ , which is the second wire group, thereby obtaining the second background signal measurement value .

In the said step (S6) in accordance with the wire A _1, A _5, and the first background signal A ₉ measured values measured, and lead from the second background A ₃ and A ₇ measured signal measuring value, calculated in the wire a ₁ ~ a _9, the first wire group a _1, a ₅ and a ₉ other than the second conductive wire group a ₃ and a ₇ of the third wire group a _2, a ₄ , A ₆ and A ₈ background signal speculation value.

In the background signal processing method of the present invention, by setting a plurality of background signal standard threshold values, an appropriate number of measuring wires is selected, and when the measured background signal is within a preset allowable range, less wires can be measured. Reduce system load and speed up system processing.

When the measured background signal exceeds the preset allowable range, more wires are measured to obtain a more detailed background signal, and the background signal measurement value or the estimated value of all the wires A ₁ to A ₉ is obtained as a reference. In the process of capturing the touch signal, the noise is filtered to ensure the accuracy and quality of the touch signal. Compared to conventional technology needs measurement all wires A signal processing method of the present invention the background is only measuring portion of the lead to the embodiments described above, for example, all the wires A ₁ ~ A _9, the measurement of the wire A _1, A ₃ , A ₅ , A ₇ and A ₉ , the required measurement is only five-fifths of the prior art, so the burden of updating the background signal can be greatly reduced and the update speed can be increased.

In an embodiment, the background signal processing method of the present invention may further include the following steps: (S7) updating according to the first background signal measurement value, the second background signal measurement value, and the background signal estimation value of the third wire group. All the background signals of the sensing device take the measured background signal measurement value and the estimated value as new benchmarks, and then enter the detection mode of the touch signal.

Please refer to FIG. 3, in another embodiment, the background signal processing party of the present invention The method includes the following steps: (S7') determining the ratio of the three values to the background signal value according to the first background signal measurement value, the second background signal measurement value, and the background signal estimation value of the third wire group Update all background signals of the sensing device, that is, multiply the background signal value by the ratio to calculate the background signal of all the wires for updating, and then enter the detection mode of the touch signal.

In an embodiment, the step (S4) may further include the following steps: (4-1) calculating a ratio of the first background signal measurement value to the background substrate signal value; and (4-2) according to the The ratio updates all background signals of the sensing device, and then enters the detection mode of the touch signal.

The background signal of all the wires is calculated for updating by calculating the ratio of the first background signal measurement value to the background substrate signal value and multiplying the background substrate signal value by the ratio.

In an embodiment, the step (S6) may use an interpolation method to calculate a background signal estimation value of the third wire group. For example, a Lagrangian interpolation method and a spline function interpolation method may be used. Or other suitable interpolation method to calculate the background signal estimation value of the third wire group. Taking the above-mentioned embodiment of measuring the wires A ₁ to A ₉ as an example, the background signal estimation value of A ₂ can be calculated by linear interpolation by the background signal measurement values of the wires A ₁ and A ₃ ; ₃ and A ₅ background signal measurement values, the linear signal interpolation method is used to calculate the background signal estimation value of A ₄ , and so on.

Please refer to FIG. 4, which is a schematic diagram of the architecture of the background signal processing system of the present invention. As shown in the figure, the background signal processing system of the present invention is applicable to a sensing device having a plurality of wires, the sensing device comprising a predetermined plurality of background signal standard threshold values and a background substrate signal value, the background signal The processing system 1 includes a storage unit 10, a measurement unit 11, and a determination module 12, and optionally includes a processing unit 13 or a calculation module 14.

The storage unit 10 is configured to store the threshold value of the background signal, and the threshold is determined according to the background signal value of the background.

The measuring unit 11 is configured to detect the background signal measurement value of the plurality of wires.

The determining module 12 is configured to determine whether the background signal measurement value is a threshold value of the background signal. In an embodiment, the threshold value may be an absolute value of two standard deviation values of the base signal, the background signal The measured value allows the threshold value to indicate that the absolute value of the background signal measurement value is less than the threshold value.

In a further embodiment, the sensing device includes a first threshold value of the background signal and a second threshold threshold of the background signal that is higher than the threshold of the first background signal. For example, the first background signal standard The threshold value may be an absolute value of two standard deviation values of the background substrate signal value; the second background signal standard threshold value may be an absolute value of three standard deviation values of the background substrate signal value. The determining module 12 can be used to determine that the absolute value of the background signal measurement value is greater than when the background signal measurement value does not meet the first background signal standard threshold but the second background signal threshold value is allowed. The first background signal update threshold is generated when the first background signal threshold is smaller than the second threshold threshold, and the background signal processing system 1 optionally includes the processing unit 13 for receiving the first After the background signal updates the signal, the background signal update is performed.

In an embodiment, the processing unit 13 is operative to calculate a ratio of the background signal measurement value to the background substrate signal value, and update the background signal value according to the ratio.

In one embodiment, the sensing device includes a first background signal standard threshold value and a second background signal standard threshold value that is higher than the first background signal standard threshold value. The determining module 12 can be used to send the background signal measurement value not to the threshold value of the second background signal. The second background signal update signal is generated, and the background signal processing system 1 can optionally include a processing unit 13 for performing background signal update after receiving the second background signal update signal.

In one embodiment, the background signal processing system 1 of the present invention is applicable to a sensing device having a plurality of wires, wherein the plurality of wires are arranged in an orthogonal manner, such as the arrangement shown in FIG.

In a further embodiment, the measuring unit 11 is configured to detect, from the nth wire, a first background signal measurement value of the first one of the plurality of wires at intervals of the first wire number, wherein n is a positive integer. The determining module 12 is configured to determine whether the first background signal measurement value corresponds to the preset first background signal standard threshold value, and when the determining module 12 determines that the first background signal measurement value does not match the The first background signal standard threshold value is multiplexed to determine whether the first background signal measurement value is allowed to be a preset second background signal standard threshold value; when the determining module 12 determines that the first background signal measurement value is not When the preset threshold value of the second background signal is allowed, the measuring unit 11 can be multiplexed to detect the second one of the plurality of wires from the n+mth wire. The second background signal measurement value, where m is a positive integer.

The background signal processing system 1 of the present invention can optionally include a computing module 14 for calculating the plurality of wires according to the first background signal measurement value and the second background signal measurement value. The background signal estimation value of the first wire group and the third wire group other than the second wire group, since the background signal measurement value or the estimated value of all the wires is obtained, it can be used as a reference and then retrieved. Noise is filtered during the touch signal to ensure the accuracy and quality of the touch signal.

In an embodiment, the computing module 14 can be used to calculate the number by interpolation. The background signal of the three-wire set, such as Lagrangian interpolation, spline function interpolation or other suitable interpolation, to obtain the background signal estimate.

In summary, the background signal processing method of the present invention and the system using the same method first measure a portion of the first wire group of all the wires, and determine whether further action is required according to the first background signal measurement value. If the first threshold threshold value of the background signal is allowed, the difference between the current background signal and the background signal value is negligible, and the remaining detection steps are omitted, which greatly simplifies the background signal update step and reduces the system load.

If further action is required, the update or further measurement is determined according to the first background signal measurement value, and if the second background signal standard threshold value is allowed, the background signal is directly updated, if not, the measurement is performed. a second set of wires of all the wires to obtain a more detailed value, and calculating the second background signal measurement value and the previously measured first background signal measurement value, and calculating the plurality of wires The background signal estimation value of the first wire group and the third wire group other than the second wire group, by setting a threshold value to select an appropriate number of measurement wires, and calculating a signal estimation value of the remaining unmeasured wires, providing completeness The background signal can reduce the burden of updating the background signal while taking care of the quality of the signal.

The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

S1~S7‧‧‧ steps

Claims (12)

A background signal processing method is applied to a sensing device having a plurality of wires, the sensing device includes a preset plurality of background signal standard threshold values and a background substrate signal value, and the background signal processing method comprises the following steps: (1) The first background signal measurement value of the first one of the plurality of wires is detected from the nth wire, wherein n is a positive integer; (2) determining the first Whether the background signal measurement value corresponds to the preset first background signal standard threshold value, and if so, the end step, if not, proceeds to step (3); (3) determines whether the first background signal measurement value is acceptable The preset second background signal standard threshold value, if yes, proceed to step (4), if not, proceed to step (5); (4) perform background signal update; (5) from n+m And detecting, by the first wire, the second background signal measurement value of the second one of the plurality of wires, wherein m is a positive integer; and (6) according to the first background signal Measuring the value and the second background signal measurement value, and calculating the plurality of wires The first signal wire group and the background other than the third wire group of the second wire group, to obtain the estimated value of the background signal. The method for processing the background signal according to the first aspect of the patent application includes: (7) updating the sensing device according to the first background signal measurement value, the second background signal measurement value, and the background signal estimation value. Background signal. The background signal processing method of claim 1, wherein the method comprises: (7') determining, according to the first background signal measurement value, the second background signal measurement value, and the background signal estimation value, the background signal value The ratio of the background signal of the sensing device is updated. The background signal processing method of claim 1, wherein the step (4) comprises the following steps: (4-1) calculating a ratio of the first background signal measurement value to the background substrate signal value; and (4-2) updating the background signal according to the ratio. The background signal processing method according to claim 1, wherein the plurality of wires are arranged in an orthogonal manner. The background signal processing method according to claim 1, wherein the step (6) calculates the background signal value of the third wire group by interpolation to obtain the background signal estimation value. A background signal processing system is applied to a sensing device having a plurality of wires, the sensing device comprising a preset first background signal standard threshold value, and a second background signal standard higher than the first background signal standard threshold value The background signal processing system includes: a storage unit for storing the first background signal standard threshold value, the second background signal standard threshold value, and the background base signal value; the measuring unit is The background signal measurement value for detecting the plurality of wires; the determining module is configured to: the background signal measurement value does not allow the first background signal standard threshold but the second background signal threshold is accepted When the value is received, the first background signal update signal is sent; and the processing unit is configured to perform the background signal update after receiving the first background signal update signal. The background signal processing system of claim 7, wherein the processing unit multiplexes to calculate a ratio of the background signal measurement value to the background substrate signal value, and updates the background signal value according to the ratio. The background signal processing system of claim 7, wherein the determining module is multiplexed to issue a second background signal update when the background signal measurement value does not exceed the second background signal threshold value. a signal, and the processing unit is multiplexed to receive the second background signal. After the new signal, the background signal update is performed. The background signal processing system of claim 7, wherein the plurality of wires are arranged in an orthogonal manner. The background signal processing system of claim 7, wherein the measuring unit is configured to detect the first one of the plurality of wires at intervals of the first number of wires from the nth wire a first background signal measurement value, and the determination module is configured to determine whether the first background signal measurement value is a preset first background signal standard threshold value; and wherein the determining module determines the first When the background signal measurement value does not exceed the preset threshold value of the first background signal, multiplexing is performed to determine whether the first background signal measurement value is allowed to be a preset second background signal standard threshold value; and wherein When the determining module determines that the first background signal measurement value does not exceed the preset second background signal standard threshold value, the measuring unit multiplexes from the n+mth wire to the first The wire number interval detects a second background signal measurement value of the second wire group of the plurality of wires, wherein m is a positive integer, and the background signal processing system further comprises a calculation module, wherein the calculation module is used According to the first background signal measurement value and the first BACKGROUND signal measuring value is calculated in the plurality of wires, the first wire group other than the background signal of the second lead wire group of a third group, to obtain the estimated value of the background signal. The background signal processing system of claim 11, wherein the calculation module is configured to calculate a background signal of the third wire group by interpolation to obtain the background signal estimation value.