CN106886327B

CN106886327B - Signal measurement method and device of touch screen

Info

Publication number: CN106886327B
Application number: CN201610944775.3A
Authority: CN
Inventors: 张钦富
Original assignee: Empia Technology Inc
Current assignee: Egalax Empia Technology Inc
Priority date: 2012-07-27
Filing date: 2013-07-26
Publication date: 2020-02-07
Anticipated expiration: 2033-07-26
Also published as: TWI553535B; CN106886327A; TWI597640B; CN103577014B; TWI597642B; TW201602888A; TWI474247B; TW201405401A; TW201514821A; CN103577014A; TW201405402A

Abstract

The touch screen driving circuit comprises a driving circuit, a driving circuit and a control circuit, wherein the driving circuit provides a driving signal to one or a group of driving conductive strips in a plurality of driving conductive strips which are arranged in parallel; a detection circuit for generating an evaluation signal of the driving conductive strip to which the driving signal is supplied, based on a signal of at least one of a plurality of detection conductive strips arranged in parallel of the touch screen in one of the plurality of sets of parameters, each time the driving signal is supplied; and a control circuit, selecting a group of initial parameter groups as reference conductive strips according to the parameter groups, using the evaluation signal generated by the detection circuit according to the initial parameter groups as a leveling signal, and selecting the initial parameter groups of each strip or each group of non-reference conductive strips respectively according to the parameter groups. Different detection parameters are given to different corresponding driving conductive strips, so that signals detected according to the detection parameters of each driving conductive strip can approach as much as possible, and the signals of the image detected by the touch screen can be optimized or leveled.

Description

Signal measurement method and device of touch screen

The invention is the application number: 201310320729.2, filing date: 2013.7.26, filed as a divisional patent.

Technical Field

The present invention relates to a method and an apparatus for measuring a capacitive touch screen, and more particularly, to a method and an apparatus for measuring a capacitive touch screen capable of generating a flat image.

Background

The capacitive touch screen is coupled with a human body through capacitance, so that a detection signal is changed, and the touch position of the human body on the capacitive touch screen is judged. When a human body touches, the noise of the environment where the human body is located is injected along with the capacitive coupling between the human body and the capacitive touch screen, and changes are also generated on the detection signal. Since the noise is continuously changing and is not easily predicted, when the signal noise is small, it is easy to cause the judgment that the touch cannot be made or the judgment that the touch position is deviated.

In addition, the signals received by the sensing strips are out of phase with the signals provided to the driving strips due to the signals passing through some loading circuits, such as capacitive coupling. When the periods of the driving signals are the same, different phase differences indicate that the signals are received with different delays, and if the signals are directly detected by neglecting the phase differences, the initial phases of the signal measurement will be different, and different results will be generated. If the measurement results corresponding to different conductive strips are very different, it is difficult to determine the correct position.

In addition, the resistance values of the resistor-capacitor circuits through which the driving signals pass may be different from each other with respect to different driving conductive strips, which may cause the height of the image obtained by the touch screen during the mutual capacitance detection, which is not favorable for the detection.

Therefore, it is obvious that the conventional capacitive touch screen still has inconvenience and defects in structure and use, and further improvement is needed. Therefore, how to create a signal measurement method and apparatus for a touch screen with a new structure is also an object of great improvement in the industry.

Disclosure of Invention

The present invention is directed to a method and an apparatus for measuring signals of a touch screen with a novel structure, which overcome the drawbacks of the conventional capacitive touch screen, and solve the technical problem of providing different sensing parameters for different driving conductive strips, so that the signals sensed according to the sensing parameters of each driving conductive strip can approach as close as possible, and the signals of the image sensed by the touch screen can be optimized or leveled (best leveling).

The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The signal measuring device of the touch screen comprises a driving circuit, a signal processing circuit and a signal processing circuit, wherein the driving circuit provides a driving signal to one or one group of driving conductive strips in a plurality of driving conductive strips arranged in parallel of the touch screen, one or one group of driving conductive strips of the driving conductive strips is a reference conductive strip, and the other strips or the other groups of driving conductive strips are non-reference conductive strips;

a detection circuit for generating an evaluation signal of the driving conductive strip provided with the driving signal according to a signal of at least one detection conductive strip from among a plurality of detection conductive strips arranged in parallel of the touch screen in one of a plurality of sets of parameters each time the driving signal is provided, wherein the driving conductive strip and the detection conductive strip are overlapped in a plurality of overlapping regions; and a control circuit for selecting a set of initial parameter sets as the reference conductive strips according to the parameter sets, using the evaluation signals generated by the detection circuit according to the initial parameter sets as leveling signals, and selecting the initial parameter sets of each non-reference conductive strip or each set of non-reference conductive strips respectively according to the parameter sets, wherein the evaluation signals generated by each non-reference conductive strip or each set of non-reference conductive strips according to the initial parameter sets are closest to the leveling signals compared with the evaluation signals generated according to other parameter sets.

The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.

In an embodiment of the signal measuring device of the touch screen, the control circuit sequentially generates the evaluation signal of the reference conductive bar according to one of the parameter sets, and uses the parameter set according to which the maximum evaluation signal of the reference conductive bar is generated as the initial parameter set of the reference conductive bar.

In an embodiment of the signal measuring device of the touch screen, the control circuit sequentially generates the evaluation signal of the reference conductive bar according to one of the parameter sets, and uses the parameter set according to which the evaluation signal of the first qualified reference conductive bar is based as the initial parameter set of the reference conductive bar.

In the signal measuring device of the touch screen, the evaluation signal is generated by one of the detecting conductive strips.

In an embodiment of the signal measuring apparatus of the touch screen, the evaluation signal is generated by summing signals of at least two of the detecting conductive strips.

In an embodiment, the signal of the conductive strip is detected by a variable resistor to the detection circuit, wherein the detection circuit changes the resistance of the variable resistor according to the initial parameter set of the conductive strip to which the driving signal is provided.

In the foregoing signal measuring device for a touch screen, the variable resistor is built in an integrated circuit.

In an embodiment of the signal measuring device of the touch screen, the detecting circuit changes a time of detecting the signal according to the initial parameter set of the conductive strip provided with the driving signal.

In an embodiment of the signal measuring apparatus for a touch screen, the signal of the detecting conductive bar is amplified by an amplifier and then provided to the detecting circuit, wherein the detecting circuit changes an amplification factor of the amplifier according to the initial parameter set of the conductive bar to which the driving signal is provided.

In the signal measuring device of the touch screen, the detecting circuit starts to measure the signal of the at least one detecting conductive strip after a delay phase difference, wherein the detecting circuit changes the delay phase difference according to the initial parameter set of the conductive strip provided with the driving signal.

Compared with the prior art, the invention has obvious advantages and beneficial effects. The technical scheme shows that the main technical content of the invention is as follows: in a resistance-capacitance circuit (RC circuit), a signal varies depending on a load passed through. The purpose of the present invention is to provide different detection parameters for different driving conductive strips, so that the signals detected according to the detection parameters of each driving conductive strip can be approached as much as possible, so as to optimize or level the signals of the image detected by the touch screen (best level). According to the present invention, a signal measuring device for a touch screen comprises: the touch screen comprises a plurality of conductive strips consisting of a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, wherein the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas; the driving circuit provides driving signals to one or a group of driving conductive strips, wherein one or a group of driving conductive strips of the driving conductive strips are reference conductive strips, and the other driving conductive strips or the other group of driving conductive strips are non-reference conductive strips; a detection circuit for generating an evaluation signal of the driving conductive strip to which the driving signal is supplied from a signal of at least the detecting conductive strip according to one of the plurality of sets of parameters each time the driving signal is supplied; and a control circuit, selecting a group of initial parameter groups as reference conductive strips according to the parameter groups, using the evaluation signals generated by the detection circuit according to the initial parameter groups as leveling signals, and selecting the initial parameter groups of each or each group of non-reference conductive strips respectively according to the parameter groups, wherein the evaluation signals generated by each or each group of non-reference conductive strips according to the initial parameter groups are closest to the leveling signals compared with the evaluation signals generated according to other parameter groups. According to the signal measuring method of the touch screen provided by the invention, the method comprises the following steps: providing a touch screen, wherein the touch screen comprises a plurality of conductive strips consisting of a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas; selecting one or one group of driving conductive strips as a reference conductive strip, and selecting other strips or other groups of driving conductive strips as non-reference conductive strips; providing a driving signal to a reference conductive bar, and detecting a signal of the at least one detection conductive bar according to one of the parameter groups; when the signal of the at least one detection conductive bar is not in the preset signal range, sequentially detecting the signal of the at least one detection conductive bar according to one of other parameter groups until the signal of the at least one detection conductive bar falls in the preset signal range; taking a signal of the at least one detection conductive strip falling within a preset signal range when the reference conductive strip is provided with the driving signal as a level signal, and taking a parameter group according to the reference conductive strip as an initial parameter group of the reference conductive strip; respectively and sequentially providing a driving signal to each strip or each group of non-reference conductive strips; when each strip or each group of non-reference conducting strips is provided with a driving signal, respectively and sequentially detecting the signal of at least one detection conducting strip according to the parameter group; and determining an initial parameter set for each strip or each group of non-reference conductive strips, wherein a driving signal value is provided for each strip or each group of non-reference conductive strips, and a signal of the at least one detection conductive strip detected according to the initial parameter set is closest to a level signal compared with a signal of the at least one detection conductive strip detected according to other parameter sets.

By the technical scheme, the signal measuring method and the signal measuring device for the touch screen at least have the following advantages and beneficial effects: the signals of the photographic image detected by the touch screen can be optimized or leveled corresponding to different driving conductive strips and different detection parameters.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIGS. 1 and 4 are schematic diagrams of a capacitive touch screen and a control circuit thereof according to the present invention;

FIG. 2A is a schematic diagram of a single electrode driving mode;

FIG. 2B and FIG. 2C are schematic diagrams of a dual-electrode driving mode;

fig. 3A and 3B are schematic flow charts of a detection method for detecting a capacitive touch screen according to the present invention;

FIG. 5 is a schematic diagram of generating a complete image;

FIG. 6 is a schematic diagram of generating an interpolated image;

FIGS. 7A and 7B are schematic diagrams illustrating the generation of an extended image; and

FIG. 8 is a schematic flow chart illustrating the process of generating an extended image according to the present invention;

FIGS. 9A and 9B are schematic diagrams illustrating different phase differences generated by driving signals via different driving conductive strips;

FIGS. 10 and 11 are schematic flowcharts illustrating a signal measurement method of a touch screen according to a first embodiment of the invention; and

FIG. 12 is a flowchart illustrating another method for measuring signals of a touch screen according to the present invention.

[ description of main element symbols ]

11: the frequency circuit 12: pulse width adjusting circuit

131: driving the switch 132: detecting switch

141: drive selection circuit 142: detection selection circuit

151: drive electrode 152: detecting electrode

16: variable resistor 17: amplifying circuit

18: the measurement circuit 19: external conductive object

41: the drive circuit 42: detection circuit

43: the storage circuit 44: frequency setting

45: the control circuit 51: complete image

52: single electrode driven one-dimensional sensing information

62: one-dimensional sensing information driven by double electrodes

61: the contracted image 71: externally expanded image

721: one-dimensional sensing information driven by first side single electrode

722: one-dimensional sensing information driven by second-side single electrode

S: drive signal

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to the signal measuring method and device of the touch screen according to the present invention, and the detailed implementation, structure, features and effects thereof, with reference to the accompanying drawings and preferred embodiments.

Capacitive touch screens are susceptible to noise interference, particularly from a human body touching the touch screen. The invention adopts an adaptive driving mode to achieve the purpose of reducing noise interference.

In the capacitive touch screen, a plurality of electrodes arranged longitudinally and transversely are used for detecting the touch position, wherein the consumption of power is positively correlated with the number of simultaneously driven electrodes and the driving voltage. In touch detection, noise may be transmitted to the capacitive touch screen along with a touched conductor, so that a signal-to-noise ratio (S/N ratio) is deteriorated, and erroneous determination and position deviation of touch are easily caused. In other words, the signal-to-noise ratio changes dynamically with the touching object and the environment.

Referring to fig. 1, a schematic diagram of a capacitive touch screen and a control circuit thereof according to the present invention includes a frequency circuit 11, a pulse width modulation circuit 12, a driving switch 131, a detecting switch 132, a driving selection circuit 141, a detecting selection circuit 142, at least a driving electrode 151, at least a detecting electrode 152, a variable resistor 16, an amplifying circuit 17, and a measuring circuit 18. The capacitive touch screen may include a plurality of driving electrodes 151 and a plurality of detecting electrodes 152, wherein the driving electrodes 151 and the detecting electrodes 152 overlap at a plurality of overlapping positions.

The frequency circuit 11 provides a frequency signal for providing the whole system according to the working frequency, and the pulse width modulation circuit 12 provides a pulse width modulation signal according to the frequency signal and the pulse width modulation parameter to drive the driving electrode 151. The driving switch 131 controls driving of the driving electrodes, and at least one driving electrode 151 is selected by the selection circuit 141. In addition, the detection switch 132 controls the electrical coupling between the driving electrode and the measurement circuit 18. When the driving switch 131 is turned on, the detecting switch 132 is turned off, and the pwm signal is provided to the driving electrodes 151 coupled to the driving selection circuit 141 through the driving selection circuit 141, wherein the driving electrodes 151 may be a plurality of driving electrodes, and the selected driving electrodes 151 may be one, two, or more driving electrodes 151. When the driving electrodes 151 are driven by the pulse width modulation signal, capacitive coupling 152 occurs at the overlapping portions of the detecting electrodes 152 and the driven driving electrodes 151, and each detecting electrode 152 provides an input signal when capacitively coupled to the driving electrode 151. The variable resistor 16 provides impedance according to the resistance parameter, the input signal is provided to the detection selection circuit 142 through the variable resistor 16, the detection selection circuit 142 selects one, two, three, multiple or all of the detection electrodes 152 from the multiple detection electrodes 152 to be coupled to the amplification circuit 17, and the input signal is provided to the measurement circuit 18 through the amplification circuit 17 according to the gain parameter. The measuring circuit 18 detects the input signal according to the pwm signal and the clock signal, wherein the measuring circuit 18 samples the detected signal according to a phase parameter at least one phase, for example, the measuring circuit 18 has at least one integrating circuit, each of which integrates the input signal in the input signal according to the phase parameter at least one phase to measure the magnitude of the input signal. In an example of the present invention, each of the integration circuits may further integrate a signal difference of one of the input signals in at least one phase according to a phase parameter, or integrate a difference of signal differences of two pairs of the input signals in at least one phase according to a phase parameter. The measurement circuit 18 may further include at least one analog-to-digital converter (ADC) for converting the result detected by the integration circuit into a digital signal. In addition, as can be understood by those skilled in the art, the aforementioned input signal may be amplified by the amplifying circuit 17 and then provided to the measuring circuit 18 by the detecting selection circuit 142, and the invention is not limited thereto.

In the invention, the capacitive touch screen has at least two driving modes, which are divided into a single-electrode driving mode and a double-electrode driving mode with the lowest power consumption, and has at least one driving potential. Each driving mode has at least one working frequency corresponding to different driving potentials, each working frequency corresponds to a set of parameters, and each driving mode represents different degrees of power consumption corresponding to different driving potentials.

The electrodes of the capacitive touch screen can be divided into a plurality of driving electrodes 151 and a plurality of detecting electrodes 152, and the driving electrodes 151 and the detecting electrodes 152 are overlapped at a plurality of overlapping positions (intersections). Referring to fig. 2A, in the single-electrode driving mode, one driving electrode 151 is driven at a time, that is, only one driving electrode 151 is provided with the driving signal S at a time, and when any one driving electrode 151 is driven, signals of all the detecting electrodes 152 are detected to generate one-dimensional sensing information. Accordingly, after all the driving electrodes 151 are driven, one-dimensional sensing information corresponding to each driving electrode 151 can be obtained to construct a complete image with respect to all the overlaps.

Referring to fig. 2B and 2C, in the dual-electrode driving mode, a pair of adjacent driving electrodes 151 are driven at a time. In other words, n drive electrodes 151 are driven n-1 times in total, and when any pair of drive electrodes 151 is driven, the signals of all the detection electrodes 152 are detected to generate one-dimensional sensing information. For example, first, as shown in fig. 2B, the first pair of driving electrodes 151 are simultaneously supplied with the driving signal S and, if there are 5, are driven 4 times. Next, as shown in fig. 2C, the driving signal S is simultaneously provided to the second pair of driving electrodes 151, and so on. Accordingly, after each pair of driving electrodes 151 (n-1 pairs in total) is driven, one-dimensional sensing information corresponding to each pair of driving electrodes 151 can be obtained to form an interpolated image relative to the complete image, wherein the number of pixels of the interpolated image is smaller than the number of pixels of the complete image. In another example of the present invention, the dual-electrode driving mode further includes performing single-electrode driving on the two side driving electrodes 151, respectively, and detecting signals of all the detecting electrodes 152 to generate one-dimensional sensing information when any one side of the single driving electrode 151 is driven, so as to additionally provide two one-dimensional sensing information, and form an extended image with the contracted image. For example, the one-dimensional sensing information corresponding to the two sides is respectively arranged outside the two sides of the contracted image to form an expanded image.

It is understood by those skilled in the art that the present invention may further include a three-electrode driving mode, a four-electrode driving mode, etc., and will not be described herein.

The driving potential may include, but is not limited to, at least two driving potentials, such as a low driving potential and a high driving potential, and the higher driving potential has a higher signal-to-noise ratio.

According to the above, in the single-electrode driving mode, a complete image can be obtained, and in the dual-electrode driving mode, a contracted image or an expanded image can be obtained. The complete image, the contracted image or the expanded image can be obtained when the external conductive object 19 approaches or touches the capacitive touch screen, so as to generate the variation of each pixel to determine the position of the external conductive object 19. Wherein, the external conductive object 19 can be one or more. As also described above, when the external conductive object 19 approaches or touches the capacitive touch screen, or capacitively couples with the driving electrode 151 and the detecting electrode 152, which causes noise interference, even if the driving electrode 151 is not driven, the external conductive object 19 may be capacitively coupled with the driving electrode 151 and the detecting electrode 152. In addition, noise may interfere from other pathways as well.

Accordingly, in an example of the present invention, when the noise detection procedure is performed, the driving switch 131 is turned off, and the detecting switch 132 is turned on, and the measuring circuit can generate a dimension sensing information of noise detection according to the signal of the detecting electrode 152, so as to determine whether the noise interference is within the acceptable range. For example, whether the noise interference is within the allowable range may be determined by determining whether any value of the one-dimensional sensing information of the noise detection exceeds a threshold, or whether the sum or average of all values of the one-dimensional sensing information of the noise detection exceeds a threshold. Those skilled in the art can deduce other ways to determine whether the noise interference is within the acceptable range by using the one-dimensional sensing information of the noise detection, and the disclosure is not described herein.

The noise detection procedure may be performed when the system is started or each time the complete image, the contracted image or the expanded image is obtained, or may be performed at regular time or after multiple times of obtaining the complete image, the contracted image or the expanded image, or may be performed when an external conductive object is detected to approach or touch the conductive object.

The invention also provides a frequency conversion procedure, which is to switch the frequency when the noise interference is judged to be out of the allowable range. The measurement circuit is provided with a plurality of sets of frequency settings, which may be stored in a memory or other storage medium, for providing the measurement circuit with a selection in the frequency conversion procedure and controlling the frequency signal of the frequency circuit 11 according to the selected frequency. The frequency conversion procedure may be to select the appropriate frequency setting from the frequency settings one by one, for example, to select one set of frequency settings one by one and perform the noise detection procedure until the noise interference is detected to be within the acceptable range. The frequency conversion procedure may also be to select the best frequency setting one by one from the frequency settings. For example, the frequency settings are selected one by one and a noise detection procedure is performed to detect the frequency setting with the minimum noise interference, such as the frequency setting with the minimum maximum value of the one-dimensional sensing information of the noise detection or the frequency setting with the minimum sum or average of all the values of the one-dimensional sensing information of the noise detection.

The frequency setting corresponds to a driving mode, a frequency and a parameter set. The parameter set may be a group including, but not limited to, one selected from the following group: the resistance parameter, the gain parameter, the phase parameter and the pulse width modulation parameter can be derived by those skilled in the art from other related parameters suitable for the capacitive touch screen and the control circuit thereof.

The frequency setting may be as shown in the following table 1, and includes a plurality of driving potentials, and the following takes the first driving potential and the second driving potential as an example, and one having ordinary knowledge in the art can deduce that there may be more than three driving potentials. Each driving potential can have a plurality of driving modes, including but not limited to the group selected from the following group: a single electrode drive mode, a two electrode drive mode, a three electrode drive mode, a four electrode drive mode, and so forth. Each driving mode corresponding to each driving potential has a plurality of frequencies, and each frequency corresponds to one of the parameter sets. One of ordinary skill in the art can deduce that the frequency of each driving mode corresponding to each driving potential may be completely different or partially the same, and the present invention is not limited thereto. TABLE 1

In light of the above, the present invention provides a method for detecting a capacitive touch screen, please refer to fig. 3A. First, as shown in step 310, a plurality of frequency settings are sequentially stored according to the power consumption, each frequency setting corresponds to a driving mode of a driving potential, and each frequency setting has a frequency and a parameter set, wherein the driving potential has at least one. Next, in step 320, the setting of the measurement circuit is initialized according to the parameter set of one of the frequency settings, and in step 330, the signal from the detection electrode is detected by the measurement circuit according to the parameter set of the measurement circuit, and a piece of one-dimensional sensing information is generated according to the signal from the detection electrode. Next, as shown in step 340, it is determined whether the interference of the noise exceeds the allowable range according to the one-dimensional sensing information. Then, as shown in step 350, when the interference of the noise exceeds the allowable range, the operating frequency and the setting of the measurement circuit are sequentially changed according to a frequency and a parameter set of one of the frequency settings to generate the dimension sensing information, and whether the interference of the noise exceeds the allowable range is determined according to the dimension sensing information until the interference of the noise does not exceed the allowable range. As shown in step 360 of fig. 3B, when the interference of the noise exceeds the allowable range, the operating frequency and the setting of the measurement circuit are respectively changed according to the frequency and the parameter set for each frequency, and then the one-dimensional sensing information is generated, and the interference of the noise is determined according to the one-dimensional sensing information, and the operating frequency and the setting of the measurement circuit are respectively changed according to the frequency and the parameter set for the frequency with the lowest interference of the noise.

For example, as shown in fig. 4, a detecting device for detecting a capacitive touch screen according to the present invention includes: a storage circuit 43, a driving circuit 41, and a detection circuit 42. As shown in step 310, the storage circuit 43 includes a plurality of frequency settings 44, which are stored in sequence according to the power consumption. The storage circuit 43 may be an electrical circuit, a memory, or any storage medium capable of storing electromagnetic records. In the present embodiment, the frequency setting 44 may be formed by a look-up table, and the frequency setting 44 may further store the power consumption parameter.

The driving circuit 41 may be an integration of a plurality of circuits, including but not limited to the aforementioned frequency circuit 11, the pwm circuit 12, the driving switch 131, the detecting switch 132, and the driving selection circuit 141. The circuits listed in this example are for convenience of description of the present invention, and the driving circuit 41 may include only a part of the circuits or add more circuits, and the present invention is not limited thereto. The driving circuit is configured to provide a driving signal to at least a driving electrode 151 of a capacitive touch screen according to a working frequency, where the capacitive touch screen includes a plurality of driving electrodes 151 and a plurality of detecting electrodes 152, and the driving electrode 151 and the detecting electrodes 152 are overlapped at a plurality of overlapping positions.

The detection circuit 42 may be an integration of a plurality of circuits, including but not limited to the measurement circuit 18, the amplification circuit 17, the detection selection circuit 142, and even may include the variable resistor bank 16. The circuits listed in this example are for convenience of description, and the detection circuit 42 may include only a portion of the circuits or add more circuits, and the invention is not limited thereto. In addition, the detecting circuit 42 further performs the steps 320 to 340, and performs the step 350 or the step 360. In the example of fig. 3B, the frequency settings may be stored in order, not according to the power consumption.

As described previously, the one-dimensional sensing information used to determine whether the disturbance of the noise exceeds the allowable range is generated when the driving signal is not supplied to the driving electrode. For example, when the driving selection circuit 131 is turned off and the detection selection circuit 132 is turned on.

In one example of the present invention, there are at least a plurality of driving modes of the driving potential, the driving modes including a single-electrode driving mode in which the driving signal is supplied to only one of the driving electrodes at a time and a two-electrode driving mode in which the driving signal is supplied to only one pair of the driving electrodes at a time. Wherein the power consumption of the single-electrode driving mode is less than the power consumption of the dual-electrode driving mode. In addition, in the single-electrode driving type, the detection circuit generates the one-dimensional sensing information when each driving electrode is provided with a driving signal to form a complete image, and in the dual-electrode driving type, the detection circuit generates the one-dimensional sensing information when each pair of driving electrodes is provided with a driving signal to form a scaled-in image, wherein the pixels of the scaled-in image are smaller than the pixels of the complete image. In addition, the detecting circuit in the dual-electrode driving mode may further include driving the two side electrodes respectively, and detecting signals of all the detecting electrodes to generate the one-dimensional sensing information respectively when the single driving electrode on either side is driven, wherein two pieces of one-dimensional sensing information generated by driving the two side electrodes respectively are disposed outside both sides of the contracted image to form an expanded image, and pixels of the expanded image are larger than pixels of the complete image.

In another example of the present invention, the driving potentials include a first driving potential and a second driving potential, wherein the single-electrode driving mode corresponding to the first driving potential generates the full image with a power consumption larger than the two-electrode driving mode corresponding to the first driving potential generates the retracted image with a power consumption larger than the single-electrode driving mode corresponding to the second driving potential generates the full image.

In another example of the present invention, the driving potentials include a first driving potential and a second driving potential, wherein a power consumption of the single electrode driving mode corresponding to the first driving potential for generating the complete image > a power consumption of the single electrode driving mode corresponding to the second driving potential for generating the complete image.

In addition, in an example of the present invention, the signal of each detection electrode is provided to the detection circuit through a variable resistor, and the detection circuit sets the impedance of the variable resistor according to a parameter set of one of the frequency settings. In addition, the signal of the detection electrode is detected after being amplified by at least one amplifying circuit, and the detection circuit sets the gain of the amplifying circuit according to one parameter group set by the frequency. Furthermore, the driving signal is generated according to a parameter set of one of the frequency settings.

In an example of the present invention, each value of the one-dimensional sensing information is generated according to the signal of the detection electrode with a set period, wherein the set period is set according to a parameter set of one of the frequency settings. In another example of the present invention, each value of the one-dimensional sensing information is generated according to the signal of the detection electrode with at least a set phase, wherein the set phase is set according to a parameter set of one of the frequency settings.

In addition, the driving circuit 41, the detecting circuit 42 and the storage circuit 43 can be controlled by the control circuit 45. The control circuit 45 may be a programmable processor, or may be other control circuits, and the invention is not limited thereto.

Fig. 5 is a schematic diagram of a single-electrode driving mode according to the present invention. The driving signal S is sequentially supplied to the first driving electrode, the second driving electrode, and up to the last driving electrode, and generates one-dimensional sensing information 52 of a single electrode driving when each driving electrode is driven by the driving signal S. The complete image 51 is formed by integrating the one-dimensional sensing information 52 of the single electrode driving generated when each driving electrode is driven, and each value of the complete image 51 corresponds to the variation of the capacitive coupling at one of the electrode intersections.

Furthermore, each value of the complete image corresponds to a position of one of the overlaps, respectively. For example, the center of each driving electrode corresponds to a first one-dimensional coordinate, and the center of each detecting electrode corresponds to a second one-dimensional coordinate. The first one-dimensional coordinate may be one of a lateral (or horizontal, X-axis) coordinate and a longitudinal (or vertical, Y-axis) coordinate, and the second one-dimensional coordinate may be the other of the lateral (or horizontal, X-axis) coordinate and the longitudinal (or vertical, Y-axis) coordinate. Each overlapping part respectively corresponds to a two-dimensional coordinate of the driving electrode and the detecting electrode overlapped at the overlapping part, and the two-dimensional coordinate is composed of a first one-dimensional coordinate and a second one-dimensional coordinate, such as (the first one-dimensional coordinate and the second one-dimensional coordinate) or (the second one-dimensional coordinate and the first one-dimensional coordinate). In other words, each single-electrode-driven one-dimensional sensing information corresponds to a first one-dimensional coordinate at the center of one of the driving electrodes, and each value of the single-electrode-driven one-dimensional sensing information (or each value of the complete image) corresponds to a two-dimensional coordinate formed by the first one-dimensional coordinate at the center of one of the driving electrodes and the second one-dimensional coordinate at the center of one of the detecting electrodes. Similarly, each value of the complete image corresponds to a central position of one of the overlapping portions, i.e., a two-dimensional coordinate formed by a first one-dimensional coordinate corresponding to a center of the driving electrode and a second one-dimensional coordinate corresponding to a center of the detecting electrode.

Fig. 6 is a schematic diagram of a dual-electrode driving mode according to the present invention. The driving signal S is sequentially provided to the first pair of driving electrodes, the second pair of driving electrodes, until the last pair of driving electrodes, and generates one-dimensional sensing information 62 of the two-electrode driving when each pair of driving electrodes is driven by the driving signal S. In other words, N drive electrodes may constitute N-1 pairs (or multiple pairs) of drive electrodes. The contracted image 61 is formed by collecting one-dimensional sensing information 62 of the two-electrode driving generated when each pair of driving electrodes is driven. The number of values (or pixels) of the scaled-in image 61 is smaller than the number of values (or pixels) of the full image 51. For the complete image, the one-dimensional sensing information of each double-electrode drive of the contracted image respectively corresponds to a first one-dimensional coordinate of the central position between a pair of driving electrodes, and each value respectively corresponds to a two-dimensional coordinate formed by the first one-dimensional coordinate of the central position between the pair of driving electrodes and a second one-dimensional coordinate of the center of one of the detecting electrodes. In other words, each value of the scaled-in image corresponds to a position of a center between a pair of overlapping positions, i.e., a two-dimensional coordinate formed by a first one-dimensional coordinate corresponding to the center between a pair of driving electrodes (or one of the driving electrodes) and a second one-dimensional coordinate corresponding to a center of one of the detecting electrodes.

Fig. 7A is a schematic diagram illustrating a first side single-electrode driving in a dual-electrode driving mode according to the present invention. The driving signal S is supplied to the driving electrode closest to the first side of the capacitive touch screen, and the single-electrode driven first-side first-dimension sensing information 721 is generated when the driving electrode closest to the first side of the capacitive touch screen is driven by the driving signal S. Referring to fig. 7B, a schematic diagram of performing the second-side single-electrode driving in the dual-electrode driving mode according to the invention is shown. The drive signal S is provided to the drive electrode closest to the second side of the capacitive touch screen and produces single electrode driven second side one-dimensional sensing information 722 when the drive electrode closest to the second side of the capacitive touch screen is driven by the drive signal S. The one-dimensional sensing information 721 and 722 of single electrode driving generated when the driving electrodes of the first side and the second side are driven are respectively disposed outside the first side and the second side of the contracted image 61 to form the expanded image 71. The number of values (or pixels) of the extended image 71 is greater than the number of values (or pixels) of the full image 51. In one example of the present invention, the first-side one-dimensional sensing information 721 driven by a single electrode is generated, the scaled-in image 61 is generated, and the second-side one-dimensional sensing information 722 driven by a single electrode is generated to form the extended image 71. In another example of the present invention, the scaled-in image 61 is generated, and the first-side and second-side one-dimensional sensing information 721 and 722 driven by the single electrode are generated to form the extended image 71.

In other words, the outward-extended image is composed of the first-side one-dimensional sensing information driven by the single electrode, the inward-contracted image and the second-side one-dimensional sensing information driven by the single electrode in sequence. Since the scaled-in image 61 is driven by two electrodes, the average size is larger than the average size of the values of the one-dimensional images on the first side and the second side of the single-electrode driving. In an example of the present invention, the values of the first-side and second-side one-dimensional sensing information 721 and 722 are scaled up and then respectively placed outside the first side and the second side of the scaled-in image 61. The ratio may be a predetermined multiple, which is greater than 1, or may be generated according to a ratio between a value of the one-dimensional sensing information driven by the dual electrodes and a value of the one-dimensional sensing information driven by the single electrodes. For example, the ratio of the sum (or average) of all the values of the first-side one-dimensional sensing information 721 to the sum (or average) of all the values of the one-dimensional sensing information 62 adjacent to the first side in the contracted image is obtained, and the value of the first-side one-dimensional sensing information 721 is enlarged by the ratio and then placed outside the first side of the contracted image 61. Similarly, the ratio of the sum (or average) of all the values of the one-dimensional sensing information 722 on the second side to the sum (or average) of all the values of the one-dimensional sensing information 62 on the adjacent second side in the contracted image is obtained, and the value of the one-dimensional sensing information 722 on the second side is enlarged by the ratio and then placed outside the second side of the contracted image 61. For another example, the ratio may be a ratio of a sum (or average) of all values of the scaled-in image 61 to a sum (or average) of all values of the one-dimensional sensing information 721 and 722 on the first side and the second side.

In the single-electrode driving mode, each value (or pixel) of the complete image corresponds to a two-dimensional position (or coordinate) at the overlapping position, and is formed by a first one-dimensional position (or coordinate) corresponding to the driving electrode at the overlapping position and a second one-dimensional position (or coordinate) corresponding to the detecting electrode, such as (the first one-dimensional position, the second one-dimensional position) or (the second one-dimensional position, the first one-dimensional position). A single external conductive object may be capacitively coupled to one or more of the overlaps, where the capacitive coupling to the external conductive object changes in response to the corresponding value in the full image, i.e., in response to the corresponding value in the full image of the external conductive object. Therefore, the centroid position (two-dimensional coordinate) of the external conductive object can be calculated according to the corresponding value and the two-dimensional coordinate of the external conductive object in the complete image.

According to an exemplary embodiment of the present invention, in the single-electrode driving mode, the corresponding one-dimensional position of each electrode (the driving electrode and the detecting electrode) is the position of the center of the electrode. According to another example of the present invention, in the dual-electrode driving mode, the corresponding one-dimensional position of each pair of electrodes (driving electrode and detecting electrode) is the center position between the two electrodes.

In the scaled-in image, the first one-dimensional sensing information corresponds to a central position of the first pair of driving electrodes, i.e., a first one-dimensional position of a center between the first and second driving electrodes (the first pair of driving electrodes). If the centroid position is simply calculated, only the position between the center of the first pair of driving electrodes and the center of the last pair of driving electrodes can be calculated, and the range of the position calculated according to the scaled-in image lacks the range between the center position of the first pair of driving electrodes (the first dimension position of the center) and the center position of the first driving electrode and the range between the center position of the last pair of driving electrodes and the center position of the last driving electrode.

In the outward-extended image, the first-side and second-side one-dimensional sensing information respectively correspond to the positions of the centers of the first and last driving electrodes, and thus the range of the positions calculated according to the outward-extended image is increased by the range between the center position of the first pair of driving electrodes (the first one-dimensional position of the center) and the center position of the first driving electrode and the range between the center position of the last pair of driving electrodes and the center position of the last driving electrode, compared with the range of the positions calculated according to the inward-extended image. In other words, the range of positions calculated from the extended image includes the range of positions calculated from the full image.

Similarly, the dual-electrode driving mode can be further expanded to a multi-electrode driving mode, that is, a plurality of driving electrodes are driven simultaneously. In other words, the driving signals are provided to a plurality of (all) driving electrodes in a group of driving electrodes at the same time, for example, the number of driving electrodes in a group of driving electrodes is two, three or four. The multi-electrode driving mode includes the aforementioned two-electrode driving mode and does not include the aforementioned one-electrode driving mode.

Please refer to fig. 8, which is a detecting method for detecting a capacitive touch screen according to the present invention. In step 810, a capacitive touch screen having a plurality of driving electrodes and a plurality of detecting electrodes arranged in parallel in sequence is provided, wherein the driving electrodes and the detecting electrodes overlap at a plurality of overlapping positions. Such as the driving electrode 151 and the detecting electrode 152. Next, as shown in step 820, driving signals are provided to one of the driving electrodes and one set of driving electrodes in the single-electrode driving mode and the multi-electrode driving mode, respectively. That is, the drive signal is supplied to only one of the drive electrodes at a time in the unipolar drive mode, and the drive signal is supplied to one set of drive electrodes of the drive electrodes at a time simultaneously in the multi-electrode drive mode, wherein each drive electrode constitutes one set of drive electrodes simultaneously driven with two drive electrodes next adjacent except the last N drive electrodes, and N is the number of drive electrodes of one set of drive electrodes minus one. The supply of the drive signal may be provided by the aforementioned drive circuit 41. Next, as shown in step 830, each time the driving signal is provided, one-dimensional sensing information is obtained from the detection electrodes, so as to obtain a plurality of multi-electrode driven one-dimensional sensing information in the multi-electrode driving mode and obtain the first-side and second-side one-electrode driven one-dimensional sensing information in the single-electrode driving mode. For example, in the multi-electrode driving mode, one-dimensional sensing information of the multi-electrode driving is obtained when each group of driving electrodes is provided with a driving signal. For another example, in the single-electrode driving mode, when the first driving electrode and the last driving electrode provide the driving signal, the one-dimensional sensing information driven by the first side single electrode and the one-dimensional sensing information driven by the second side single electrode are respectively obtained. The one-dimensional sensing information can be obtained by the detection circuit 42. The one-dimensional sensing information includes one-dimensional sensing information (retracted image) driven by the multiple electrodes and one-dimensional sensing information driven by the first-side and second-side single electrodes. Next, as shown in step 840, an image (an extended image) is generated according to the one-dimensional sensing information of the first single-electrode drive, the one-dimensional sensing information of all the multi-electrode drives, and the one-dimensional sensing information of the second single-electrode drive. Step 840 may be performed by the control circuit described above.

As described above, the potential of the drive signal in the single-electrode drive mode and the potential of the drive signal in the multi-electrode drive mode are not necessarily the same, and may be the same or different. For example, the single-electrode drive is driven by a first ac potential that is larger than the first ac potential, and a ratio of the first ac potential to the second ac potential is a predetermined ratio with respect to a second ac potential of the multi-electrode drive. In addition, in step 840, the image is generated according to whether all the values of the one-dimensional sensing information driven by the first-side and second-side single electrodes are multiplied by the same or different predetermined ratios, respectively. Further, the frequency of the driving signal in the single-electrode driving mode is different from the frequency of the driving signal in the multi-electrode driving mode.

The number of the driving electrodes of one set of driving electrodes may be two, three or even more, and the invention is not limited thereto. In a preferred mode of the present invention, the number of the driving electrodes of one set of the driving electrodes is two. When the number of the driving electrodes of one group of driving electrodes is two, each driving electrode corresponds to a first dimension coordinate, wherein the dimension sensing information driven by each multi (double) electrode corresponds to a first dimension coordinate at the center between a pair of driving electrodes of the driving electrodes, and the dimension sensing information driven by the first side single electrode and the second side single electrode corresponds to a first dimension coordinate of a first driving electrode and a first dimension coordinate of a last driving electrode.

Similarly, when the number of the driving electrodes of one group of driving electrodes is multiple (more than two), each driving electrode corresponds to the first dimension coordinate, wherein the one-dimension sensing information of each multi-electrode driving corresponds to the first dimension coordinate of the center between the two driving electrodes that are farthest away from each other in the group of driving electrodes, and the one-dimension sensing information of the single-electrode driving of the first side and the second side corresponds to the first dimension coordinate of the first driving electrode and the first dimension coordinate of the last driving electrode.

In addition, each of the detecting electrodes corresponds to a second one-dimensional coordinate, and each value of each one-dimensional sensing information corresponds to a second one-dimensional coordinate of one of the detecting electrodes.

Fig. 9A and 9B are schematic diagrams illustrating the detection conductive strips receiving the capacitive coupling signals via the driving conductive strips. Since the signals pass through some loading circuits, such as capacitive coupling, the signals received by the detecting conductive strips are out of phase with the signals provided before the driving conductive strips. For example, when the driving signal is provided to the first driving conductive strip, the signal received by the first detecting conductive strip and the signal provided before the driving conductive strip generate a first phase difference ψ 1, as shown in fig. 9A, and when the driving signal is provided to the second driving conductive strip, the signal received by the first detecting conductive strip and the signal provided before the driving conductive strip generate a second phase difference ψ 2, as shown in fig. 9B.

The first phase difference ψ 1 and the second phase difference ψ 2 differ depending on a resistance capacitance circuit (RCcircuit) through which the drive signal passes. When the periods of the driving signals are the same, different phase differences indicate that the signals are received with different delays, and if the signals are directly detected by neglecting the phase differences, the initial phases of the signal measurement will be different, and different results will be generated. For example, assume that the phase difference is 0, and the signal is a sine wave, and the amplitude is a. When the signal is detected at 30 degrees, 90 degrees, 150 degrees, 210 degrees, 270 degrees and 330 degrees, signals of |1/2A |, |1/2A |, | -1/2A |, | -A | and |1/2A | are obtained, respectively. However, when the phase difference is 150 degrees, the measured phase is deviated so that the detection signals with the phases of 180 degrees, 240 degrees, 300 degrees, 360 degrees, 420 degrees and 480 degrees are obtained as 0, and 480 degrees, respectively,

0、And

of the signal of (1).

In the above example, it can be seen that the delay of the initial phase of measurement caused by the phase difference can make the signal measurement result completely different, and similar difference exists no matter whether the driving signal is a sine wave or a square wave (such as PWM).

In addition, each time the driving signal is provided, the driving signal may be provided to a plurality of adjacent driving bus bars, wherein the driving bus bars are sequentially arranged in parallel. In the preferred embodiment of the present invention, two adjacent driving conductive strips are provided, so that n driving conductive strips are provided with n-1 driving signals in a scan, each time one group of driving conductive strips is provided, for example, the first driving conductive strip is provided for the first time, the second driving conductive strip is provided for the second time, the third driving conductive strip is provided for the second time, and so on. As previously mentioned, the number of driving conductive strips provided each time a driving signal is provided may be one, two or more, and the present invention does not limit the number of driving conductive strips provided each time a driving signal is provided. Each time the driving signal is provided, all the signals measured by the detecting conductive strips can be integrated into one-dimensional sensing information, and all the one-dimensional sensing information in one scanning can be integrated into one two-dimensional sensing information which can be regarded as an image.

Accordingly, in the first embodiment of the best mode of the present invention, the detection signal is delayed by using different phase differences for different conductive strips. For example, a plurality of phase differences are determined, and when each set of driving conductive strips is provided with driving signals, the signals are measured according to each phase difference, and the phase difference according to the largest of the measured signals is the phase difference between the signal before being provided to the driving conductive strips and the signal after being received by the detecting conductive strips, and is referred to as the closest phase difference in the following description. The signal measurement may be performed by selecting one of the detecting conductive strips to perform measurement according to each phase difference, or selecting a plurality of or all of the detecting conductive strips to perform measurement according to each phase difference, and determining the most approximate phase difference according to a sum of signals of the plurality of or all of the detecting conductive strips. According to the above, the most approaching phase difference of each group of conductive strips can be determined, in other words, when each group of conductive strips is provided with the driving signal, the measurement is performed after all the detected conductive strip delays are provided with the most approaching phase difference of the driving signal.

In addition, it is not necessary to measure signals according to all aberrations, and the signals may be measured according to one phase difference in sequence among the phase difference(s) until the measured signals are found to decrease after increasing, wherein the phase difference according to the largest of the measured signals is the closest phase difference. Thus, a video with a large signal can be obtained.

In addition, a group of the driving bus bars may be selected as a reference bus bar, other bus bars may be called non-reference bus bars, the most approximate phase difference of the reference bus bar may be detected as a level phase difference, and then the phase difference of the most approximate level phase difference of the non-reference driving bus bars may be detected as a most level phase difference. For example, the signal measured according to the leveling phase difference of the reference conductive bar is used as the leveling signal, the signal is measured for each phase difference of each set of non-reference driving conductive bars, and the phase difference of the closest leveling signal in the measured signals is used as the leveling phase difference of the driving conductive bar to which the driving signal is provided. Therefore, the level phase difference of each group of driving conductive strips can be judged, and the measurement of the delayed signals is carried out according to the level phase difference of each group of driving conductive strips, so that a relatively level image can be obtained, namely the difference between the signals in the image is small. In addition, the leveling signal may fall within a predetermined working range, and does not necessarily need to be the best signal.

In the above description, it is assumed that all the detecting conductive strips use the same phase difference each time the driving signal is provided, and those skilled in the art can understand that each group of detecting conductive strips respectively use the respective closest phase difference or the average phase difference each time the driving signal is provided. In other words, each time the driving signal is provided, the signal is measured for each phase difference of each set of detecting conductive strips to determine the most approximate phase difference or the average phase difference.

In fact, in addition to using the aberration to delay the measurement to obtain a larger or more collimated image, the more collimated image may also be obtained with different magnification, impedance, and measurement time.

Accordingly, the present invention provides a signal measurement method for a touch screen, as shown in fig. 10. In step 1010, a touch screen is provided, where the touch screen includes a plurality of conductive strips formed by a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas. In addition, in step 1020, the delay phase difference of each driving conductive strip or each group of driving conductive strips is determined. Then, as shown in step 1030, a driving signal is sequentially provided to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signal and the detecting conductive strips are mutually capacitively coupled. Next, in step 1040, each time the driving signal is provided, the signal of each detected combination of the provided driving signals is delayed by the corresponding phase difference before being measured.

Accordingly, in the signal measuring apparatus of the touch screen of the present invention, the step 1030 can be implemented by the driving circuit 41. In addition, step 1040 can be implemented by the detection circuit 42.

In an exemplary embodiment of the present invention, the delay phase difference of each driving conductive strip or each group of driving conductive strips is selected from a plurality of predetermined phase differences, such as the aforementioned closest phase difference. Each group of conductive strips refers to a group of multiple conductive strips to which driving signals are simultaneously supplied during multiple driving, and is implemented by the driving selection circuit 141 of the driving circuit 41. For example, one or a group of the driving conductive strips is selected as the selected conductive strip in sequence, as implemented by the driving circuit 41. Next, the delay phase difference of the selected conductive strip is selected from a plurality of predetermined phase differences. Wherein when the drive signal is provided to the selected conductive strip, the signal measured after delaying the phase difference is greater than the signal detected after delaying other predetermined phase differences. For example, the delay phase difference detected by the detection circuit 42 can be stored in the storage circuit 43.

In addition, the aforementioned collimated phase difference may be selected. For example, one or a group of the driving conductive strips is selected as a reference conductive strip, and the other strips or the other group of conductive strips are selected as non-reference conductive strips, as implemented by the driving circuit 41. And then, selecting the delay phase difference of the reference conductive bar from a plurality of preset phase differences, wherein when the driving signal is provided for the reference conductive bar, the signal detected after delaying the delay phase difference is larger than the signal detected after delaying other preset phase differences. The delay phase difference of the reference conductive strip is the aforementioned flat phase difference. Then, the signal detected after delaying the delayed phase difference by the reference conductive strip is used as the reference signal, one or a group of non-reference conductive strips of the non-reference conductive strips are selected as the selected conductive strips in sequence, and the delayed phase difference of the selected conductive strips is selected from a plurality of predetermined phase differences, such as the above-mentioned most accurate phase difference, wherein when the driving signal is provided to the selected conductive strips, the signal detected after delaying the delayed phase difference is closest to the reference signal compared with the signal detected after delaying other predetermined phase differences. The above can be implemented by the detection circuit 42.

In the present example, when the driving signal is provided to the reference bus bar or the bus bar selected by be or become heir to, the signal measured by the plurality of detecting bus bars is the signal measured by one of the detecting bus bars. In other words, the delay phase difference is selected according to the signal of the same detection conductive strip. In another example of the present invention, when the driving signal is provided to the reference conductive strip or the selected conductive strip be or become heir to, the signals measured by the plurality of detecting conductive strips are the sum of the signals measured by at least two detecting conductive strips of the detecting conductive strips. In other words, the delay phase difference is selected according to the sum of the signals of the same plurality of detection conductive strips or all the detection conductive strips.

As mentioned above, the overlapping area of each driven conductive strip and each detection conductive strip may have a corresponding delay phase difference. In the following description, each or each group of driving conductive strips and each or each group of detecting conductive strips are overlapped to form a detecting assembly. In other words, the driving signal can be provided to one or more driving conductive strips at the same time, and the signal can also be measured by one or more detecting conductive strips. When the signals are generated by measurement, the combination of the driving bus bar or the driving bus bars provided with the driving signals and the detecting bus bar or the detecting bus bars to be measured is called as a detecting combination. For example, when driving a single or multiple drivers, a signal value is detected by one conductive strip, or a difference value is measured by two conductive strips, or a double difference value is measured by three conductive strips. Wherein the difference value is a difference of signals of two adjacent conductive strips, and the double difference value is a difference generated by subtracting a difference of signals of two subsequent conductive strips from a difference of signals of two previous conductive strips among three adjacent conductive strips.

Accordingly, another exemplary embodiment of the present invention is a method for measuring signals of a touch screen, as shown in fig. 11. In step 1110, a touch screen is provided, where the touch screen includes a plurality of conductive strips formed by a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas. In addition, as shown in step 1120, each or each group of driving conductive strips and each or each group of detecting conductive strips are overlapped respectively to form a detecting combination, and as shown in step 1130, the delay phase difference of each detecting combination is determined. Then, in step 1140, driving signals are sequentially provided to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals in the detecting combination provided with the driving signals are mutually capacitively coupled with the overlapped detecting conductive strips. Next, as shown in step 1150, each time the driving signal is provided, the signal of each detected combination of the provided driving signals is delayed by the corresponding phase difference before being measured.

Accordingly, in a signal measuring device of the present invention, the step 1140 can be implemented by the driving circuit 41, and the step 1150 can be implemented by the detecting circuit 42.

In an example of the present invention, step 1130 may include: sequentially selecting one of the detection combinations as the selected detection combination can be implemented by the driving circuit 41; and selecting the delayed phase difference of the selected detection combination from the plurality of predetermined phase differences, wherein the delayed measured signal is greater than the delayed detected signal by the detection circuit 42 when the driving signal is provided to the selected detection combination.

In another example of the present invention, determining the delay phase difference for each detected combination may also be performed as described below. Selecting one of the detection combinations as a reference detection combination, the other detection combinations as non-reference detection combinations, and sequentially selecting one of the non-reference detection combinations as a selected detection combination may be implemented by the driving circuit 41. In addition, a delayed phase difference of a reference detection combination is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the reference detection combination, the signal detected after delaying the delayed phase difference is larger than the signal detected after delaying other predetermined phase differences, and the signal detected after delaying the delayed phase difference by the reference detection combination is used as the reference signal. In addition, a delayed phase difference of the selected detection combination is selected from a plurality of predetermined phase differences, wherein when the driving signal is provided to the selected detection combination, the signal detected after delaying the delayed phase difference is closest to the reference signal compared with the signals detected after delaying other predetermined phase differences. The above can be implemented by the detection circuit 42.

In a second embodiment of the present invention, the signals are measured by a control circuit, the signals of each group of detecting conductive strips are measured after passing through a variable resistor, and the control circuit determines the impedance of the variable resistor according to each group of driving conductive strips. For example, one group of the driving conductive strips is selected as a reference conductive strip, and the other conductive strips are called non-reference conductive strips. First, a plurality of preset impedances are set, and a signal of one detection bus bar is detected when a driving signal is provided to a reference bus bar (which may be one or more), or the sum of signals of a plurality of or all detection bus bars is detected as a leveling signal. In addition, the leveling signal may fall within a predetermined operating range and does not necessarily need to be the best or maximum signal. In other words, any predetermined impedance that can make the leveling signal fall within the predetermined working range can be used as the leveling impedance of the reference conductive bar. When each set of non-reference bus bars is provided with a driving signal value, the variable resistor is adjusted according to each preset impedance respectively, and the signal of the detection bus bar is detected, or the sum of the signals of the multiple or all detection bus bars is detected, so as to compare the preset impedance closest to the leveling signal and serve as the leveling impedance of the set of non-reference bus bars relative to the driving signal provided. Therefore, the leveling impedance of each group of driving conductive strips can be judged, the impedance of the variable resistor (the variable resistor is adjusted to the leveling impedance) is adjusted according to the leveling impedance of each group of driving conductive strips, and a relatively leveled image can be obtained, namely, the difference between signals in the image is small.

In the above description, all the detecting conductive strips adopt the same level impedance every time the driving signal is provided, and those skilled in the art can understand that each group of detecting conductive strips adopts the respective level impedance every time the driving signal is provided. In other words, each time the driving signal is provided, the signal is measured for each preset impedance of each group of detecting conductive strips to determine the predicted impedance which most approaches the leveling signal, and accordingly, the leveling impedance of each detecting conductive strip when the driving signal is provided for each group of driving conductive strips is obtained respectively, so as to adjust the impedance of the variable resistor electrically coupled to each detecting conductive strip respectively.

The control circuit may be composed of one or more ICs, in addition to electronic components. In an example of the present invention, the variable resistor may be built in an IC, and the impedance of the variable resistor may be controlled by a programmable program (e.g., firmware in the IC). For example, the variable resistor is composed of a plurality of resistors and is controlled by a plurality of switches, and the impedance of the variable resistor is adjusted by turning on and off (on and off) different switches. The variable resistor in the IC can be applied to touch panels with different characteristics in a programmable program control mode through firmware modification, so that the cost can be effectively reduced, and the aim of commercial mass production is fulfilled.

In a third embodiment of the present invention, the signal is measured by a control circuit, the signal of each group of detection conductive bars is measured by a detection circuit (such as an integrator), and the control circuit determines the amplification factor of the detection circuit according to each group of driving conductive bars. For example, one group of the driving conductive strips is selected as a reference conductive strip, and the other conductive strips are called non-reference conductive strips. First, a plurality of preset amplification factors are set, and a signal of one detection conductive strip is detected when a driving signal is provided to a reference conductive strip (possibly one or more) or the sum of the signals of a plurality of or all detection conductive strips is detected as a leveling signal. In addition, the leveling signal may fall within a predetermined operating range and does not necessarily need to be the best or maximum signal. In other words, any preset magnification that can make the leveling signal fall within the preset working range can be used as the leveling magnification of the reference conductive bar. Next, when each set of non-reference bus bars is provided with a driving signal value, the detection circuit is adjusted according to each preset amplification factor respectively, and the signal of the detection bus bar is detected, or the sum of the signals of the multiple or all detection bus bars is detected, so as to compare the preset amplification factor closest to the leveling signal as the leveling amplification factor relative to the set of non-reference bus bars provided with the driving signal. Therefore, the horizontal magnification of each group of driving conductive strips can be judged, the magnification of the detection circuit is adjusted according to the horizontal magnification of each group of driving conductive strips, and a relatively horizontal image can be obtained, namely, the difference between signals in the image is small.

In the above description, it is assumed that all the detecting conductive strips use the same level amplification factor each time the driving signal is provided, and those skilled in the art can understand that each group of detecting conductive strips respectively use the respective level amplification factor each time the driving signal is provided. In other words, each time the driving signal is provided, the signal is measured for each preset amplification factor of each group of detecting conductive strips to determine the most approximate predicted amplification factor of the leveling signal, and accordingly, the leveling amplification factor of each group of detecting conductive strips when the driving signal is provided to each group of driving conductive strips is obtained.

In a fourth embodiment of the present invention, the signals are measured by a control circuit, the signals of each group of detection bus bars are measured by a detection circuit (such as an integrator), and the control circuit determines the measurement time of the detection circuit according to each group of driving bus bars. For example, one group of the driving conductive strips is selected as a reference conductive strip, and the other conductive strips are called non-reference conductive strips. First, a plurality of preset measurement times are set, and a signal of one detection bus bar is detected when the reference bus bar (possibly one or more) is provided with a driving signal, or the sum of the signals of a plurality of or all detection bus bars is detected as a leveling signal. In addition, the leveling signal may fall within a predetermined operating range and does not necessarily need to be the best or maximum signal. In other words, any predetermined measurement time that allows the leveling signal to fall within the predetermined working range can be used as the leveling time of the reference conductive bar. Next, when each set of non-reference bus bars is provided with a driving signal value, the detection circuit is adjusted according to each preset measurement time respectively, and the signal of the detected bus bar is detected, or the sum of the signals of the multiple or all detected bus bars is detected, so as to compare the preset measurement time closest to the leveling signal as the leveling measurement time relative to the set of non-reference bus bars provided with the driving signal. Therefore, the leveling time of each group of driving conductive bars can be judged, the measuring time of the detection circuit is adjusted according to the leveling time of each group of driving conductive bars, and a relatively leveled image can be obtained, namely, the difference between signals in the image is small.

In the above description, it is assumed that all the detecting conductive strips adopt the same leveling time each time the driving signal is provided, and those skilled in the art can understand that each set of detecting conductive strips adopts the respective leveling time each time the driving signal is provided. In other words, each time the driving signal is provided, the signal is measured for each preset measurement time of each group of detecting conductive bars respectively to determine the predicted measurement time which is closest to the leveling signal, and accordingly, the leveling measurement time of each group of detecting conductive bars when the driving signal is provided for each group of driving conductive bars is obtained respectively.

In the foregoing description, one or a mixture of the first embodiment, the second embodiment, the third embodiment and the fourth embodiment may be selected for implementation, and the present invention is not limited thereto. In addition, when the leveling signal is measured, one or more detection conductive strips farthest from the detection circuit may be selected for signal detection to generate the leveling signal. For example, the signal of the farthest detecting conductive strip may be used to generate a leveling signal, or the differential signals of the farthest detecting conductive strips may be used to generate a leveling signal (difference), or the difference between the differential signals of the first two and the last two of the farthest detecting conductive strips may be used to generate a leveling signal (double difference). In other words, the leveling signal may be a signal value, a difference value or a double difference value, or other values generated according to signals of one or more detection conductive strips.

Please refer to fig. 12, which illustrates a signal measurement method of a touch screen according to the present invention. In step 1210, a touch screen is provided, where the touch screen includes a plurality of conductive strips formed by a plurality of driving conductive strips arranged in parallel and a plurality of detecting conductive strips arranged in parallel, and the driving conductive strips and the detecting conductive strips are overlapped in a plurality of overlapping areas. In addition, as shown in step 1220, one or a group of the driving conductive strips is selected as a reference conductive strip, and the other strips or the other groups of the driving conductive strips are selected as non-reference conductive strips. The reference conductive strip may be the first driving conductive strip or the first group of driving conductive strips, or may be driving conductive strips at other positions, and the invention is not limited thereto. Next, in step 1230, a driving signal is provided to the reference conductive bar, and a signal of the at least one detection conductive bar is detected according to one of the parameter sets. In step 1240, when the signal of the at least one detection conductive strip is not within the predetermined signal range, the signal of the at least one detection conductive strip is detected sequentially according to one of the other parameter sets until the signal of the at least one detection conductive strip falls within the predetermined signal range. In addition, in step 1250, the signal of the at least one detection conductive strip falling within the predetermined signal range when the reference conductive strip is provided with the driving signal is used as the leveling signal, and the parameter group based on the reference conductive strip is used as the initial parameter group of the reference conductive strip. Then, as shown in step 1260, a driving signal is sequentially provided to each or each group of non-reference conductive strips, and as shown in step 1270, when each or each group of non-reference conductive strips is provided with a driving signal, the signal of the at least one detection conductive strip is sequentially detected according to the parameter group. Then, in step 1280, an initial parameter set for each non-reference conductive strip or each set of non-reference conductive strips is determined, wherein a driving signal value is provided for each non-reference conductive strip or each set of non-reference conductive strips, and a signal of the at least one detection conductive strip detected according to the initial parameter set is closest to a level signal compared to a signal of the at least one detection conductive strip detected according to other parameter sets.

According to the first, second, third and fourth embodiments, the parameter set can be used to change the delay phase difference, the resistance of the variable resistor, the amplification factor of the detection circuit and the measurement time of the detection circuit. In a first example of the present invention, the driving signal is transmitted to the at least detecting conductive bar through a variable resistor, wherein a resistance of the variable resistor is changed according to an initial parameter of the conductive bar to which the driving signal is provided. In a second example of the present invention, the time of detecting the signal is varied according to the initial parameter of the conductive strip to which the driving signal is applied. In a third example of the present invention, the driving signal is amplified by an amplifier and provided to the at least one detecting conductive strip, wherein the amplification factor of the amplifying circuit is changed according to an initial parameter of the conductive strip to which the driving signal is provided. In addition, in the fourth example of the present invention, the signals of at least the detecting conductive strips are delayed by a phase difference, wherein the phase difference is changed according to the initial parameters of the conductive strips to which the driving signals are provided.

Accordingly, referring to fig. 4, the signal measurement of the touch screen according to the present invention includes: a touch screen, a driving circuit 41, a detecting circuit 42 and a control circuit 45. The touch screen includes a plurality of driving conductive strips 151 arranged in parallel and a plurality of detecting conductive strips 152 arranged in parallel, wherein the driving conductive strips 151 and the detecting conductive strips 152 are overlapped in a plurality of overlapping regions. The driving circuit 41 provides driving signals to one or a group of driving conductive strips 151, wherein one or a group of driving conductive strips 151 of the driving conductive strips 151 is a reference conductive strip, and the other strips or the other groups of driving conductive strips 151 are non-reference conductive strips. The detection circuit 42 generates an evaluation signal of the driving conductive strip 151 to which the driving signal is provided from a signal of at least one detection conductive strip 152 according to one of a plurality of sets of parameters each time the driving signal is provided. The control circuit 45 selects a set of initial parameter sets as reference conductive bars according to the parameter sets, uses the evaluation signals generated by the detection circuit according to the initial parameter sets as leveling signals, and selects an initial parameter set of each non-reference conductive bar or each set of non-reference conductive bars according to the parameter sets, wherein the evaluation signals generated by each non-reference conductive bar or each set of non-reference conductive bars according to the initial parameter sets are closest to the leveling signals compared with the evaluation signals generated by other parameter sets. In addition, the parameter set may be stored in the storage circuit 43.

The evaluation signal may be generated according to signals of one or more detection conductive strips. For example, the evaluation signal is generated by one of the detection conductive strips. For another example, the evaluation signal is generated by summing signals of at least two of the detection conductive strips.

In addition, in an example of the present invention, the controller may sequentially generate the evaluation signals of the reference bus bars from the detection circuit according to one of the parameter sets, and use the parameter set according to which the maximum evaluation signal of the reference bus bar is generated as the initial parameter set of the reference bus bar. In another example of the present invention, the controller may sequentially generate the evaluation signals of the reference bus bars from the detection circuit according to one of the parameter sets, and use the parameter set according to which the evaluation signal of the first qualified reference bus bar is based as the initial parameter set of the reference bus bar.

According to the first, second, third and fourth embodiments, the parameter set can be used to change the delay phase difference, the resistance of the variable resistor, the amplification factor of the detection circuit and the measurement time of the detection circuit. In a first example of the present invention, the driving signal is transmitted to the at least detecting conductive bar through the variable resistor, wherein the detecting circuit changes the resistance of the variable resistor according to the initial parameter of the conductive bar to which the driving signal is transmitted. In a second example of the present invention, the detection circuit varies the time of the detection signal according to the initial parameter of the conductive strip to which the driving signal is applied. In a third example of the present invention, the driving signal is amplified by an amplifier and provided to the at least detecting conductive bar, wherein the detecting circuit changes the amplification factor of the amplifying circuit according to the initial parameter of the conductive bar to which the driving signal is provided. In addition, in the fourth example of the present invention, the detection circuit starts to measure the signals of at least the detection conductive bars after the delay phase difference, wherein the detection circuit changes the delay phase difference according to the initial parameter of the conductive bar to which the driving signal is provided.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A signal measuring device of a touch screen, comprising:

the driving circuit provides driving signals to one or one group of driving conductive strips in a plurality of driving conductive strips arranged in parallel of the touch screen, wherein one or one group of driving conductive strips of the driving conductive strips is a reference conductive strip, and the other strips or the other groups of driving conductive strips are non-reference conductive strips;

a detection circuit for generating an evaluation signal of the driving conductive strip provided with the driving signal according to a signal of at least one detection conductive strip from among a plurality of detection conductive strips arranged in parallel of the touch screen in one of a plurality of sets of parameters each time the driving signal is provided, wherein the driving conductive strip and the detection conductive strip are overlapped in a plurality of overlapping regions; and

and a control circuit for selecting a set of initial parameters from the parameter sets as the reference conductive strips, and using the evaluation signal generated by the detection circuit according to the initial parameter set as a leveling signal, wherein the leveling signal falls within a preset signal range, and selecting the initial parameter set of each non-reference conductive strip or each set of non-reference conductive strips respectively according to the parameter sets, wherein the evaluation signal generated by each non-reference conductive strip or each set of non-reference conductive strips according to the initial parameter set is closest to the leveling signal compared with the evaluation signals generated according to other parameter sets.

2. The apparatus of claim 1, wherein the control circuit sequentially generates the evaluation signals of the reference conductive bars from the detection circuit according to one of the parameter sets, and uses the parameter set according to which the maximum evaluation signal of the reference conductive bar is generated as the initial parameter set of the reference conductive bar.

3. The apparatus of claim 1, wherein the control circuit sequentially generates the evaluation signals of the reference conductive bars from the detection circuit according to one of the parameter sets, and uses the parameter set according to which the evaluation signal of the first qualified reference conductive bar is based as the initial parameter set of the reference conductive bar.

4. The apparatus of claim 1, wherein the evaluation signal is generated by one of the detecting conductive strips.

5. The apparatus of claim 1, wherein the evaluation signal is generated by summing signals of at least two of the detection conductive strips.

6. The apparatus of claim 1, wherein the signals for detecting the conductive strips are transmitted to the detection circuit via a variable resistor, wherein the detection circuit changes the resistance of the variable resistor according to the initial parameter set of the conductive strips to which the driving signals are applied.

7. The apparatus of claim 6, wherein the variable resistor is implemented in an integrated circuit.

8. The apparatus of claim 1, wherein the detection circuit varies the timing of the detection signal according to the initial parameter set of the conductive strip to which the driving signal is applied.

9. The apparatus of claim 1, wherein the signals of the detecting conductive strips are amplified by an amplifier and provided to the detecting circuit, wherein the detecting circuit varies the amplification factor of the amplifier according to the initial parameter set of the conductive strips provided with the driving signals.

10. The apparatus of claim 1, wherein the detection circuit starts measuring the signal of the at least one detection conductive strip after a delay phase difference, wherein the detection circuit changes the delay phase difference according to the initial parameter set of the conductive strip to which the driving signal is provided.