TWI536223B - 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.

In general, for touch panels, especially those using capacitive touch technology, the background noise must be filtered out during the sensor's signal acquisition to accurately 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 background signal threshold value, and the background signal processing method includes the following steps: from the nth The first background signal measurement value of the first one of the plurality of wires is detected by the number of the first wires, wherein n is a positive integer; determining whether the first background signal measurement value is The preset background signal threshold value, if yes, the end step, if not, the second wire group of the plurality of wires is detected from the n+m wire from the first wire number interval a background signal measurement value, wherein m is a positive integer; and calculating, according to the first background signal measurement value and the second background signal measurement value, the first wire group and the first wire group The background signal estimate of the third set of conductors other than the second set of conductors.

A 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 background signal threshold value, and the background signal processing system includes: a storage unit for The threshold value of the background signal is stored; 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 whether the background signal measurement value conforms to the background signal standard Threshold value.

Compared with the prior art which needs to measure the background signal of all the wires, the present invention provides a background signal processing method and system, which firstly measures all the wires. The first wire set measures the first background signal measurement value, and determines whether further measurement is needed according to the first background signal measurement value. If not, the remaining detection steps can be omitted, thereby greatly simplifying the background signal update. Steps and lighten the burden; if further measurements are required, measure a portion of the second set of conductors in all of the conductors and calculate the measured value of the second background signal and the previously measured first background signal measurement In the plurality of wires, the background signal estimation value of the third wire group other than the first wire group and the second wire group is relatively unknown because only a part of the wire groups of all the wires are not measured. Technically, the invention has a low burden and calculates the signal estimation value of the remaining unmeasured wires, so that a complete background signal can still be provided to ensure the quality of the captured signal.

A ₁ ~A ₉ ‧‧‧ wire

B ₁ ~B ₉ ‧‧‧Wire

S1~S5‧‧‧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 a background signal processing system of the present invention. Schematic diagram of the architecture.

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 diagram of a wire arrangement of a background signal processing method and system to which the present invention is applied. 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 driven, the wires B ₁ to B ₉ are not driven, and the sensing functions of A ₁ to A ₉ are respectively used to sense the self-capacitance. On the other hand, when measuring the mutual capacitance, first, for the wire A ₁ , the wires B ₁ to B _{9 are} sequentially driven, and the sensing function of A ₁ is used to sense the mutual capacitance for the wires B ₁ to B ₉ , after that, The same steps are performed for the wires A ₂ to A ₉ respectively to obtain mutual capacitances of the wires A ₁ to A ₉ for 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 background signal threshold value. In an embodiment, the sensing device performs multiple comprehensive background signal measurements in an environment that is insulated from electromagnetic compatibility (EMC). (for example, 10 to 30 times), statistically obtaining a set of background signal signals, including the average value and standard deviation of the background signal, etc., as a basis for updating the background signal, and determining the basis signal according to the background signal The default background signal threshold value, for example, the threshold value may be the absolute value of two (or more) standard deviation values of the background substrate signal.

Please refer to FIG. 2, which is a flow chart of the background signal processing method of the present invention. The 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 agrees with the preset background The standard threshold value of the signal, if yes, the end step, if not, proceed to step (S3); (S3) from the n+mth wire, detecting the number of the plurality of wires at the interval of the first wire a second background signal measurement value of the two wire sets, wherein m is a positive integer; and (S4) calculating the plurality of wires according to the first background signal measurement value and the second background signal measurement value a background signal estimation value of the first wire group and the third wire group other than the second wire group.

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 background signal threshold value to determine the current first background signal measurement value and the background substrate signal. Whether the difference exceeds the preset allowable range. In an embodiment, the threshold value of the background signal may be an absolute value of two standard deviation values of the background signal, but is not limited thereto. When the first background signal measurement value satisfies the threshold value of the background signal, it means that the absolute value of the first background signal measurement value is less than the threshold value of the background signal, if the condition is met, the background is displayed The difference between the signals is still within the preset tolerance, no need to be updated, so the end step can enter the detection mode of the touch signal; if this condition is not allowed, the difference between the signal and the background signal exceeds the preset. For the allowable range, it is necessary to proceed to step (S3).

In the said step (S3), 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 (S4) 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.

The background signal processing method of the present invention can obtain the background signal measurement value or the estimation value of all the wires A ₁ to A ₉ , so that it can be used as a reference, and the noise is filtered out during the process of capturing the touch signal to ensure the noise. The accuracy and quality of the touch signal are captured, and all the wires are measured compared to the prior art. The background signal processing method of the present invention only needs to measure a part of the wire, and the above embodiment is taken as an example, in all the wires A ₁ ~A ₉ needs to measure the wires A ₁ , A ₃ , A ₅ , A ₇ and A ₉ , and the required measurement is only five-fifths of the prior art, so the burden of background noise update can be greatly reduced and increased. refresh rate.

In an embodiment, the background signal processing method of the present invention may further include the step (S5) of updating the background signal measurement value, the second background signal measurement value, and the background signal estimation value of the third wire group according to the first background signal measurement value. 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.

In an embodiment, the step (S4) may calculate the background signal estimation value of the third wire group by using interpolation, for example, using Lagrangian interpolation, spline function interpolation or other suitable The interpolation method calculates 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. 3, 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 includes a preset background signal threshold value, and the background signal processing system 1 includes a storage unit 10. The measuring unit 11 and the determining module 12 may additionally include a processing unit 13 or a computing 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 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 corresponds to the threshold value of the background signal. In an embodiment, the threshold value may be an absolute value of two standard deviation values of the background substrate signal, the background The signal measurement value allows the threshold value to indicate that the absolute value of the background signal measurement value is less than the threshold value.

In other embodiments, the determining module 12 can be used to determine that the background signal measurement value does not match the background signal threshold value, that is, the difference between the background signal measurement value and the background substrate signal exceeds a preset. The background signal processing system 1 can optionally include a processing unit 13 for performing the background signal update after receiving the 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 other embodiments, the measuring unit 11 can be configured to detect, from the nth wire, the first background signal amount of the first one of the plurality of wires at intervals of the first wire number The value is determined, and the determining module 12 is configured to determine whether the first background signal measurement value corresponds to the preset background signal threshold value, where n is a positive integer.

The measuring unit 11 is configured to detect the complex number of the first wire number interval from the n+m wire when the first background signal measurement value does not meet the preset background signal threshold value. A second background signal measurement of the second set of conductors, wherein m is a positive integer.

In other embodiments, the background signal processing system 1 of the present invention optionally includes a computing module 14 for determining the first background signal measurement value and the second background signal measurement value according to the first background signal measurement value. Calculating the background signal estimation value of the third wire group other than the first wire group and the second wire group in the plurality of wires, since the background signal measurement value or the estimated value of all the wires is obtained, As a benchmark, the noise is filtered out during the process of capturing the touch signal to ensure the accuracy and quality of the touch signal.

In an embodiment, the calculation module 14 can be used to calculate the background signal of the third wire group by interpolation, such as Lagrangian interpolation, spline function interpolation or other suitable interpolation. To obtain the background signal estimation value.

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 measurement is needed according to the measured first background signal measurement value. If not, the remaining detection steps can be omitted, the background signal update step is greatly simplified and the burden is reduced; if further measurement is required, a portion of the second set of wires in all of the wires is measured, and the second background is measured. The signal measurement value and the previously measured first background signal measurement value, and the background signal estimation value of the third wire group other than the first wire group and the second wire group in the plurality of wires is calculated, since only Need to measure all the middle of the wire The wire group is divided into not all, so the burden is lower than the prior art, and the signal estimation value of the remaining unmeasured wire is calculated, so that a complete background signal can still be provided to ensure the quality of the captured 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~S5‧‧‧Steps

Claims (8)

A background signal processing method is applied to a sensing device having a plurality of wires, the sensing device includes a preset background signal threshold value, and the background signal processing method comprises the following steps: (1) starting from the nth wire Detecting, by the first wire number interval, a first background signal measurement value of the first wire group of the plurality of wires, wherein n is a positive integer; (2) determining an absolute value of the first background signal measurement value Whether the value is less than the preset threshold value of the background signal, and if so, the step is ended; if not, proceeding to step (3); (3) starting from the n+mth line, detecting the number of the first wire Detecting a second background signal measurement value of the second one of the plurality of wires, wherein m is a positive integer; and (4) determining the measured value according to the first background signal and the second background signal And calculating a background signal estimation value of the third wire group other than the first wire group and the second wire group in the plurality of wires. The method for processing a background signal according to the first aspect of the patent application includes: (5) 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 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 (4) calculates the background signal estimation value of the third wire group by interpolation. A background signal processing system is applied to a sensing device having a plurality of wires, the sensing device includes a preset background signal threshold value, and the background signal processing system includes: a storage unit for storing the background signal standard Threshold value; the measuring unit is configured to detect the complex number at intervals of the first wire from the nth wire The first background signal measurement value of the first wire group of the wire; the determining module is configured to determine whether the absolute value of the first background signal measurement value is less than a threshold value of the background signal; wherein the measurement The unit is multiplexed to detect the plurality of lines from the n+mth line when the absolute value of the first background signal measurement value is not less than the preset background signal threshold value a second background signal measurement value of the second wire group in the wire, wherein m is a positive integer; and a calculation module configured to measure the first background signal value and the second background signal And calculating a background signal estimation value of the third wire group other than the first wire group and the second wire group in the plurality of wires. The background signal processing system of claim 5, wherein the determining module multiplexes the background signal update when the absolute value of the first background signal measurement value is greater than or equal to the background signal threshold value. And the background signal processing system comprises: a processing unit configured to perform background signal update after receiving the background signal update signal. The background signal processing system of claim 5, wherein the plurality of wires are arranged in an orthogonal manner. The background signal processing system of claim 5, wherein the computing module is configured to calculate a background signal of the third wire group by interpolation to obtain the background signal estimation value.