TWI597640B - Detecting method and device for touch screen - Google Patents

Description

Signal measurement method and device for touch screen

The present invention relates to a method and apparatus for measuring a capacitive touch screen, and more particularly to a method and apparatus for measuring a capacitive touch screen that compensates for phase delay of a resistor-capacitor circuit.

The capacitive touch screen is a capacitive coupling between the human body and the human body, causing a change in the detection signal to determine the position of the human body on the capacitive touch screen. When the human body touches, the noise of the environment in which the human body is located is also injected with the capacitive coupling between the human body and the capacitive touch screen, and also changes the detection signal. Since the noise is constantly changing, it is not easy to be predicted. When the noise is relatively small, it is easy to make no judgment or touch the positional deviation.

In addition, since the signal passes through some load circuit, such as capacitive coupling, the phase difference between the signal received by the detecting strip and the signal supplied to the driving strip is generated. When the periods of the driving signals are the same, different phase differences indicate that the signal delays are received at different times. If the phase difference is directly ignored, the starting phase of the signal measurement is different and different results are produced. If the results of the measurements corresponding to different conductive strips are very different, it will be difficult to determine the correct position.

It can be seen that the above prior art obviously has inconveniences and defects, and needs to be further improved. In order to solve the above problems, the relevant manufacturers do not bother to find a solution, but the design that has not been applied for a long time has been developed, and the general products and methods have no suitable structure and methods to solve the above problems. Obviously it is an issue that the relevant industry is anxious to solve. Therefore, how to create a new technology is one of the current important research and development topics, and it has become the goal that the industry needs to improve.

In a RC circuit, the signal will have a delay due to the different loads. If such a delay is ignored, the detected signal will not meet expectations. It is an object of the present invention to provide different delay times (or phase differences) for different drive strips in order to optimize or level the signal of the image detected by the touch screen.

The object of the present invention and solving the technical problems thereof are achieved by the following technical solutions. A method for measuring a signal level of a touch screen according to the present invention includes: providing a touch screen, the touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving Conducting strips overlap the detecting conductive strips in a plurality of overlapping regions; determining a retardation phase difference of each or each set of driving conductive strips; sequentially providing a driving signal to the driving conductive strips One or a group, is provided with a drive signal Driving the conductive strip to produce a mutual capacitive coupling with the detecting conductive strip; and delaying a delay phase difference corresponding to one or a group of driving conductive strips of the supplied driving signal each time the driving signal is supplied The detecting at least one of the conductive strips detects the conductive strip measurement signal.

The object of the present invention and solving the technical problems thereof can also be achieved by the following technical solutions. A method for measuring a signal level of a touch screen according to the present invention includes: providing a touch screen, the touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving The conductive strip overlaps the detecting conductive strip in a plurality of overlapping regions; driving the conductive strips for each or each group and respectively overlapping each or each set of detecting conductive strips as a detection combination; a delay phase difference of each detection combination; sequentially providing a driving signal to one or a group of the driving conductive strips, and driving the conductive strips provided with the driving signals in the detecting combination of the driving signals The stacked detection strips produce mutual capacitive coupling; and each time the drive signal is provided, the signal of each detected combination of the provided drive signals is measured after delaying the corresponding phase difference.

The object of the present invention and solving the technical problems thereof can also be achieved by the following technical solutions. A signal measuring device for a touch screen according to the present invention includes: a touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips And the detecting conductive strip overlaps the plurality of overlapping regions; a driving electric And sequentially providing a driving signal to one or a group of the driving conductive strips, wherein the driving conductive strips provided with the driving signals and the detecting conductive strips generate mutual capacitive coupling, wherein each or each The group driving strip corresponds to a delay phase difference; and a detecting circuit determines a delay phase difference of each or each group of driving strips and delays a strip corresponding to the supplied driving signal each time the driving signal is supplied Or detecting a strip measurement signal by at least one of the detecting strips after a delay phase difference of the driving strips.

The object of the present invention and solving the technical problems thereof can also be achieved by the following technical solutions. A signal measuring device for a touch screen according to the present invention includes: a touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips And the detecting conductive strip overlaps the plurality of overlapping regions; a driving circuit sequentially provides a driving signal to one or a group of the driving conductive strips, and is provided in the detecting combination of the driving signals The driving conductive strip provided with the driving signal and the overlapping detecting conductive strips generate mutual capacitive coupling, wherein each or each group of driving conductive strips and respectively overlapping each or each group of detecting conductive strips as a detection Combining and each detection combination corresponds to a delay phase difference; and a detecting circuit is measured after each driving signal is supplied, each detected combination signal of the driving signal is delayed by a corresponding phase difference .

With the above technical solution, the present invention has at least the following advantages and advantages: different delay times (or phases) are given for different driving conductive strips. Poor), which can optimize or level the signal of the image detected by the touch screen.

The invention will be described in detail below with some embodiments. However, the invention may be applied to other embodiments in addition to the disclosed embodiments. The scope of the present invention is not limited by the embodiments, which are subject to the scope of the claims. To provide a clearer description and to enable those skilled in the art to understand the invention, the various parts of the drawings are not drawn according to their relative dimensions, and the ratio of certain dimensions to other related dimensions will be highlighted. The exaggerated and irrelevant details are not completely drawn to illustrate the simplicity of the illustration.

Capacitive touch screens are susceptible to noise interference, especially from the human body that touches the touch screen. The invention adopts an adaptive driving method to achieve the purpose of reducing noise interference.

In a capacitive touch screen, a plurality of electrodes arranged longitudinally and laterally are used to detect the position of the touch, wherein the power consumption is positively correlated with the number of electrodes driven at the same time and the voltage of the driving. When performing touch detection, the noise may be transmitted to the capacitive touch screen along with the touched conductor, so that the signal-to-noise ratio (S/N ratio) is deteriorated, which may easily cause misjudgment and positional deviation of the touch. In other words, the signal-to-noise ratio changes dynamically with the object being touched and the environment in which it is located.

1 is a schematic diagram of a capacitive touch screen and a control circuit thereof, including a clock circuit 11, a pulse width modulation circuit 12, a driving switch 131, a detecting switch 132, and a driving selection. The circuit 141, a detection selection circuit 142, at least one driving electrode 151, at least one 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, and the driving electrodes 151 and the detecting electrodes 152 overlap at a plurality of overlaps.

The clock circuit 11 provides a clock signal for providing the entire system according to an operating frequency, and the pulse width modulation circuit 12 provides a pulse width modulation signal according to the clock signal and a pulse width modulation parameter to drive the driving electrode 151. The drive switch 131 controls the driving of the drive electrodes, and at least one drive electrode 151 is selected by the selection circuit 141. In addition, the detection switch 132 controls the electrical coupling between the drive electrode and the measurement circuit 18. When the driving switch 131 is on, the detecting switch 132 is off, and the pulse width modulation signal is supplied to the driving electrode 151 coupled by the driving selection circuit 141 via the driving selection circuit 141, wherein the driving electrode 151 can be There are a plurality of strips, and the selected driving electrodes 151 may be one, two, or a plurality of the driving electrodes 151. When the driving electrode 151 is driven by the pulse width modulation signal, the overlapping of the detecting electrode 152 and the driven driving electrode 151 overlaps, and a capacitive coupling 152 is generated, and each detecting electrode 152 is in capacitance with the driving electrode 151. An input signal is provided for sexual coupling. The variable resistor 16 provides a resistance according to a resistance parameter The input signal is provided to the detection selection circuit 142 via the variable resistor 16. The detection selection circuit 142 selects one, two, three, multiple or all of the detection electrodes 152 from the plurality of detection electrodes 152 to be coupled to the amplification. In circuit 17, the input signal is supplied to measurement circuit 18 via amplification circuit 17 in accordance with a gain parameter. The measurement circuit 18 detects the input signal according to the pulse width modulation signal and the pulse signal. The measurement circuit 18 can sample the detection signal according to at least one phase according to a phase parameter. For example, the measurement circuit 18 can have at least An integrating circuit, each integrating circuit integrating an input signal of the input signal in at least one phase according to a phase parameter to measure a size of the input signal. In an example of the present invention, each of the integrating circuits may further integrate the signal difference of the pair of input signals in the input signal according to the phase parameter, or respectively according to the phase parameter, and at least one phase according to the phase parameter respectively. Integrating the difference in signal differences of the two pairs of input signals in the input signal. In addition, the measurement circuit 18 can also include a less analogy of the digital power (ADC) to convert the result detected by the integration circuit into a digital signal. In addition, one of ordinary skill in the art can deduce that the aforementioned input signal may be first amplified by the amplifying circuit 17 and then supplied to the measuring circuit 18 by the detecting and selecting circuit 142, which is not limited by the present invention.

In the present invention, the capacitive touch screen has at least two driving modes, which are divided into a most power-saving single-electrode driving mode, a two-electrode driving mode, and have at least one driving potential. Each drive mode has a corresponding drive potential There is one less operating frequency, each operating frequency corresponds to a set of parameters, and each driving mode represents a different degree of power consumption corresponding to different driving potentials.

The electrode 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 overlap at a plurality of 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 supplied with the driving signal S at the same time, and when any driving electrode 151 is driven, all detecting electrodes are detected. The signal of 152 is used to generate one-dimensional sensing information. Accordingly, after driving all of the driving electrodes 151, one-dimensional sensing information corresponding to each of the driving electrodes 151 can be obtained to constitute a complete image with respect to all the overlapping portions.

Referring to FIGS. 2B and 2C, in the two-electrode driving mode, adjacent pairs of driving electrodes 151 are driven at a time. In other words, the n driving electrodes 151 are driven a total of n-1 times, and when any pair of driving electrodes 151 are driven, the signals of all the detecting electrodes 152 are detected to generate one-dimensional sensing information. For example, first, as shown in FIG. 2B, a driving signal S is simultaneously supplied to the first pair of driving electrodes 151, and if there are five, it is driven four times. Next, as shown in FIG. 2C, the driving signal S is simultaneously supplied to the second pair of driving electrodes 151, and so on. Accordingly, after driving each pair of driving electrodes 151 (total n-1 pairs), one-dimensional sensing information corresponding to each pair of driving electrodes 151 can be obtained to constitute a complete image relative to the foregoing For a retracted image of the image, the number of pixels in the retracted image is less than the number of pixels in the full image. In another example of the present invention, the two-electrode driving mode further includes performing single-electrode driving on the driving electrodes 151 on both sides, and detecting the signals of all the detecting electrodes 152 to generate signals when the single driving electrodes 151 are driven on either side. The one-dimensional sensing information provides two additional one-dimensional sensing information, and the inflated image forms an expanded image. For example, the one-dimensional sensing information corresponding to the two sides is respectively placed on both sides of the retracted image to form an expanded image.

A person having ordinary knowledge in the art can infer that the present invention can further include a three-electrode driving mode, a four-electrode driving mode, and the like, and details are not described herein again.

The aforementioned 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 a higher driving potential has a higher signal to noise ratio.

According to the foregoing, in the single electrode driving mode, a complete image can be obtained, and in the two electrode driving mode, a retracted image or an expanded image can be obtained. The complete image, the inner thumbnail or the expanded image may be obtained when the external conductive object 19 approaches or touches the capacitive touch screen and the capacitive touch screen, thereby generating a variation amount of each pixel to determine the position of the external conductive object 19. Wherein, the external conductive object 19 may be one or more. As described above, when the external conductive object 19 approaches or touches the capacitive touch screen, or is capacitively coupled with the driving electrode 151 and the detecting electrode 152, causing noise interference, Even when the driving electrode 151 is not driven, the external conductive member 19 may be capacitively coupled with the driving electrode 151 and the detecting electrode 152. In addition, noise may also interfere with other channels.

Accordingly, in an example of the present invention, when the noise detection process is performed, the driving switch 131 is turned off, and the detecting switch 132 is turned on. At this time, the measuring circuit can generate a signal according to the signal of the detecting electrode 152. One-dimensional sensing information of noise detection to determine whether the noise interference is within the allowable range. For example, it may be determined whether the one-dimensional sensing information of the noise detection has any value exceeding a threshold value, or whether the sum or average of all values of the one-dimensional sensing information of the noise detection exceeds one threshold. Limits to determine if the noise interference is within the acceptable range. A person skilled in the art can infer other ways of determining whether the noise interference is within the allowable range by using the one-dimensional sensing information of the noise detection, and the present invention does not describe it.

The noise detection program may be performed when the system is started or each time the complete image, the retracted image or the expanded image is acquired, or the complete image, the retracted image or the expanded image may be obtained periodically or repeatedly. When performing, or detecting that an external conductive object is approaching or touching, a person skilled in the art can infer other appropriate timings for performing the noise detection procedure, and the present invention is not limited thereto.

The present invention further provides a frequency changing procedure for performing frequency switching when it is determined that the noise interference exceeds the allowable range. The measurement circuit is provided with multiple sets of frequency settings, Therefore, it is stored in a memory or other storage medium to provide a measurement circuit for selection in the frequency changing program, and controls the clock signal of the clock circuit 11 according to the selected frequency. The frequency changing procedure may be to select an appropriate frequency setting one by one in the frequency setting, for example, selecting one of the frequency settings one by one and performing a noise detection procedure until the noise interference is detected to be within an allowable range. The frequency changing procedure may also be to select an optimum frequency setting one by one in the frequency setting. For example, the frequency setting is selected one by one and a noise detection process is performed to detect a frequency setting in which the noise interference is minimized, for example, the maximum value of the one-dimensional sensing information for detecting the noise detection is the minimum frequency setting. , or the sum or average of all values of the one-dimensional sensing information of the noise detection is the minimum frequency setting.

The frequency setting corresponds to, but not limited to, a driving mode, a frequency, and a parameter group. The parameter group may be a group including, but not limited to, the following set of parameters: the foregoing resistance parameter, the aforementioned gain parameter, the aforementioned phase parameter, and the aforementioned pulse width modulation parameter, and those skilled in the art having ordinary knowledge may infer that other Capacitive touch screen and related parameters of its control circuit.

The frequency setting may be as shown in the following Table 1, including a plurality of driving potentials. The following is exemplified by the first driving potential and the second driving potential. Those having ordinary knowledge in the art may infer that there may be more than three types of driving. Potential. Each of the driving potentials may have a plurality of driving modes, including but not limited to a group selected from the group consisting of a single electrode driving mode and a two-electrode driving mode. , three-electrode drive mode, four-electrode drive mode, and more. Each of the drive modes corresponding to each of the drive potentials has a plurality of frequencies, each of which corresponds to one of the aforementioned parameter sets. Those of ordinary skill in the art can deduce that the frequency of each of the driving modes corresponding to each driving potential may be completely different or partially the same, and the present invention is not limited thereto.

According to 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 is a driving mode corresponding to a driving potential, and each frequency setting has a frequency and a parameter group, wherein the driving potential There is at least one. Next, as shown in step 320, the setting of the detecting circuit is initialized according to the parameter set of one of the frequency settings, and as shown in step 330, detecting the circuit is detected by the detecting circuit according to a parameter group of the detecting circuit. Detecting the signal of the electrode and generating one-dimensional sensing information according to the signal from the detecting electrode. Then, as shown in step 340, it is determined whether the interference of a noise exceeds an 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 detecting circuit are respectively changed according to the frequency and the parameter group of one of the frequency settings. After the setting, the one-dimensional sensing information is generated, and determining whether the interference of the noise exceeds the allowable range according to the one-dimensional sensing information until the interference of the noise does not exceed the allowable range of the process. Alternatively, 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 detecting circuit are respectively changed according to the frequency and parameter set set by each frequency. Post production Generating the one-dimensional sensing information, and determining the interference of the noise according to the one-dimensional sensing information, and changing the working frequency and the parameter group respectively with a frequency set by a frequency at which the noise interference is lowest The setting of the detection circuit.

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 detecting circuit 42. As shown in the foregoing step 310, the storage circuit 43 includes a plurality of frequency settings 44, which are sequentially stored according to the power consumption size. The storage circuit 43 can be a circuit, a memory or any storage medium capable of storing electromagnetic recordings. In an example of the present invention, the frequency setting 44 may be configured in a look-up manner. In addition, the frequency setting 44 may also store power consumption parameters.

The driving circuit 41 may be an integration of a plurality of circuits, including but not limited to the aforementioned clock circuit 11, pulse width modulation circuit 12, drive switch 131, detection switch 132, and drive selection circuit 141. The circuit listed in this example is convenient for the description of the present invention, and the driving circuit 41 may include only a part of the circuit or add more circuits, and the invention is not limited thereto. The driving circuit is configured to provide a driving signal to at least one driving electrode 151 of a capacitive touch screen according to an operating frequency. The capacitive touch screen includes a plurality of driving electrodes 151 and a plurality of detecting electrodes 152, and the driving electrodes 151 The detection electrode 152 overlaps the plurality of overlaps.

The detection circuit 42 can be an integration of multiple circuits, including but not limited to the front The measurement circuit 18, the amplification circuit 17, and the detection selection circuit 142 may even include a variable electrical group 16. The circuit listed in this example is convenient for the description of the present invention. The detecting circuit 42 may include only a part of the circuit or add more circuits, and the invention is not limited thereto. In addition, the detecting circuit 42 further includes performing the foregoing steps 320 to 340, and performing step 350 or step 360. In the example of FIG. 3B, the frequency setting may be stored in order not according to the power consumption.

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

In an example of the present invention, the at least one driving potential has a plurality of driving modes, and the driving mode includes a single-electrode driving mode and a two-electrode driving mode, wherein the driving signal simultaneously provides only the driving in the single-electrode driving mode One of the electrodes, and in the two-electrode drive mode, the drive signal provides only one pair of the drive electrodes at the same time. The power consumption of the single-electrode driving mode is smaller than the power consumption of the two-electrode driving mode. In addition, in the single-electrode driving type, the detecting circuit generates the one-dimensional sensing information when each driving electrode is supplied with a driving signal to form a complete image, and wherein the two electrodes are In the driving mode, the detecting circuit generates the one-dimensional sensing information when each pair of driving electrodes is provided with a driving signal to form a retracted image, wherein the pixels of the retracted image are smaller than The pixel of the complete image. In addition, the detecting circuit in the two-electrode driving mode may further comprise driving the two electrodes separately, and when a single driving electrode on either side is driven, detecting signals of all detecting electrodes to respectively generate the one-dimensional sensing Information, wherein two one-dimensional sensing information generated by driving the electrodes on both sides are disposed on both sides of the retracted image to form an expanded image, and the pixels of the expanded image are larger than the The pixels of the full image.

In another example of the present invention, the driving potential includes a first driving potential and a second driving potential, wherein the single-electrode driving mode corresponding to the first driving potential generates power consumption of the complete image The size > the two-electrode driving mode corresponding to the first driving potential generates a power consumption amount of the retracted image > the single-electrode driving mode corresponding to the second driving potential generates a consumption of the complete image Electric size.

In another example of the present invention, the driving potential includes a first driving potential and a second driving potential, wherein the single-electrode driving mode corresponding to the first driving potential generates power consumption of the complete image The size > the single electrode driving mode corresponding to the second driving potential produces a power consumption of the complete image.

In addition, in an example of the present invention, the signals of each detecting electrode are respectively supplied to the detecting circuit through a variable resistor, and the detecting circuit is a parameter group according to one of the frequency settings. The impedance of the variable resistor is set. In addition, the signal of the detecting electrode is first passed through at least one amplifying circuit The large signal is detected, and the detecting circuit sets the gain of the amplifying circuit according to a parameter group of one of the frequency settings. Furthermore, the drive signal is generated based on 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 a signal of the detecting electrode in a set period, wherein the set period is one according to the frequency setting. The parameter group is set. In another example of the present invention, each value of the one-dimensional sensing information is generated according to a signal of the detecting electrode by at least one set phase, wherein the set phase is according to the frequency. Set one of the parameter groups to set.

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

Please refer to FIG. 5, which 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, ... until the last driving electrode, and generates a single-electrode driving one-dimensional sensing information when each driving electrode is driven by the driving signal S. 52. The single-element driving one-dimensional sensing information 52 generated when each driving electrode is driven may constitute a complete image 51, and each value of the complete image 51 respectively changes the capacitive coupling of one of the electrode intersections. .

Furthermore, each value of the complete image corresponds to the position of one of the overlaps, respectively. For example, the central positions of each of the driving electrodes respectively correspond to a first one-dimensional coordinate, and the centers of each of the detecting electrodes respectively correspond to a second one-dimensional coordinate. The first dimension coordinate may be one of a lateral (or horizontal, X-axis) coordinate and a longitudinal (or vertical, Y-axis) coordinate, and the second dimension coordinate may be a lateral (or horizontal, X-axis) coordinate and a longitudinal direction (or Vertical, Y-axis) Another of the coordinates. Each of the overlapping portions corresponds to a two-dimensional coordinate of the driving electrode and the detecting electrode overlapping the overlapping portion, and the two-dimensional coordinate is composed of the first one-dimensional coordinate and the second one-dimensional coordinate, such as (first one Dimension coordinates, second dimension coordinates) or (second dimension coordinates, first dimension coordinates). In other words, the one-dimensional sensing information of each single-electrode driving respectively corresponds to the first one-dimensional coordinate in the center of one of the driving electrodes, wherein each value of one-dimensional sensing information driven by the single electrode (or each of the complete images) A value) respectively corresponds to a two-dimensional coordinate formed by a first one-dimensional coordinate in the center of one of the driving electrodes and a second one-dimensional coordinate in the center of one of the detecting electrodes. Similarly, each value of the complete image corresponds to a central position of one of the overlaps, that is, a first one-dimensional coordinate corresponding to a center of one of the driving electrodes and a center of one of the detecting electrodes, respectively. The two-dimensional coordinates formed by the second dimension coordinates.

Please refer to FIG. 6, which is a schematic diagram of a two-electrode driving mode according to the present invention. The driving signal S is sequentially supplied to the first pair of driving electrodes, the second pair of driving electrodes, ... until the last pair of driving electrodes, and is driven at each pair of driving electrodes The two-electrode-driven one-dimensional sensing information 62 is generated when the motion signal S is driven. In other words, the N drive electrodes can constitute N-1 pairs (multiple pairs) of drive electrodes. The two-electrode-driven one-dimensional sensing information 62 generated when each pair of driving electrodes is driven may constitute a retracted image 61. The number of values (or pixels) of the retracted image 61 is less than the number of values (or pixels) of the full image 51. Relative to the complete image, each of the two-electrode-driven one-dimensional sensing information of the indented image corresponds to a first one-dimensional coordinate of a central position between the pair of driving electrodes, and each value corresponds to the pair of driving electrodes respectively A two-dimensional coordinate formed by the first dimension coordinate of the central location and the second one-dimensional coordinate of the center of one of the detecting electrodes. In other words, each value of the indented image corresponds to a position between the centers of the pair of overlaps, that is, a first one-dimensional coordinate corresponding to a central position between the pair of driving electrodes (or one of the plurality of pairs of driving electrodes), respectively. a two-dimensional coordinate formed by a second one-dimensional coordinate in the center of one of the detecting electrodes.

Please refer to FIG. 7A, which is a schematic diagram of performing first-side single-electrode driving in the two-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 generates a first-side one-dimensional sensing information of the single-electrode driving when the driving electrode closest to the first side of the capacitive touch screen is driven by the driving signal S 721. Referring again to FIG. 7B, a schematic diagram of the second side single electrode driving in the two-electrode driving mode according to the present invention is shown. The drive signal S is supplied to the drive electrode closest to the second side of the capacitive touch screen, and is produced when the drive electrode closest to the second side of the capacitive touch screen is driven by the drive signal S The second side one-dimensional sensing information 722 is driven by a single electrode. The one-electrode driving one-dimensional sensing information 721 and 722 generated when the driving electrodes of the first side and the second side are driven are respectively placed outside the first side and the second side of the retracted image 61 to form an expanded image. 71. The number of values (or pixels) of the expanded image 71 is greater than the number of values (or pixels) of the full image 51. In an example of the present invention, the first side one-dimensional sensing information 721 of the single-electrode driving is generated first, and then the retracted image 61 is generated, and then the second-side one-dimensional sensing information 722 of the single-electrode driving is generated to form An external expansion image 71. In another example of the present invention, the indented image 61 is first generated, and the first side and second side one-dimensional sensing information 721 and 722 of the single electrode driving are respectively generated to form an expanded image 71.

In other words, the expanded image is composed of a first side one-dimensional sensing information driven by a single electrode, a retracted image, and a second-side one-dimensional sensing information driven by a single electrode. Since the value of the retracted image 61 is a two-electrode drive, the average size will be greater than the average size of the values of the first- and second-side one-dimensional images of the single-electrode drive. In an example of the present invention, the values of the first side and the second side one-dimensional sensing information 721 and 722 are respectively scaled and then placed outside the first side and the second side of the retracted image 61, respectively. The ratio may be a preset multiple, and the preset multiple is greater than 1, or may be generated according to a ratio between a value of the one-dimensional sensing information driven by the two electrodes and a value of the one-dimensional sensing information driven by the single electrode. For example, the sum (or average) of all values of the one-dimensional sensing information 721 on the first side and the sum (or average) of all values of the one-dimensional sensing information 62 on the adjacent first side in the indented image. The ratio of the first side one-dimensional sensing information 721 is amplified by the scale and placed outside the first side of the retracted image 61. Similarly, the sum (or average) of all values of the one-dimensional sensing information 722 of the second side and the sum (or average) of all values of the one-dimensional sensing information 62 of the adjacent second side of the indented image, second The value of the side-one-dimensional sensing information 722 is placed outside the second side of the retracted image 61 after being scaled up. For another example, the aforementioned ratio may be a ratio of the sum (or average) of all values of the indented image 61 to the sum (or average) of all values of the one-dimensional sensing information 721 and 722 of 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 a stack, which is the first one-dimensional position corresponding to the driving electrodes stacked one above the other. (or coordinates) formed by a second dimensional position (or coordinate) corresponding to the detecting electrode, such as (first dimension position, second dimension position) or (second dimension position, first dimension position) . A single external conductive object may be capacitively coupled to one or more overlaps, and a capacitive coupling change at the intersection with the external conductive object may cause a change in capacitive coupling, corresponding to a corresponding value in the complete image, ie, the reaction is external The conductive object corresponds to the corresponding value in the complete image. Therefore, according to the corresponding value and the two-dimensional coordinate of the external conductive object corresponding to the complete image, the centroid position (two-dimensional coordinate) of the external conductive object can be calculated.

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

In the retracted image, the first one-dimensional sensing information corresponds to a central position of the first pair of driving electrodes, that is, a first one-dimensional position 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 from the indented image lacks the center position of the first pair of driving electrodes ( The range between the central first dimension position) and the central position of the first drive electrode and the center position of the last pair of drive electrodes and the central position of the last drive electrode.

Compared with the retracted image, in the expanded image, the first side and the second side one-dimensional sensing information respectively correspond to the positions of the center of the first strip and the last driving electrode, so the range ratio of the position calculated according to the expanded image is The range of positions calculated from the retracted image increases the range between the center position of the first pair of driving electrodes (the first one-dimensional position in the center) and the central position of the first driving electrode, and the center position and the last position of the last pair of driving electrodes The range between the central positions of the drive electrodes. In other words, the range of positions calculated from the expanded image includes the range of positions calculated from the complete image.

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

Please refer to FIG. 8 , which illustrates a method for detecting a capacitive touch screen according to the present invention. As shown in step 810, a capacitive touch screen having a plurality of driving electrodes and a plurality of detecting electrodes arranged in parallel is provided, wherein the driving electrodes and the detecting electrodes overlap at a plurality of overlaps. For example, the driving electrode 151 and the detecting electrode 152 described above. Next, as shown in step 820, a driving signal is supplied to one of the driving electrodes and one of the driving electrodes to drive the electrodes in the single electrode driving mode and the multi-electrode driving mode, respectively. That is, the driving signal is supplied to only one of the driving electrodes at a time in a unipolar driving mode, and the driving signal is a group which is simultaneously supplied with the driving electrodes at a time in a multi-electrode driving mode. The driving electrodes, wherein each of the driving electrodes and the two adjacent driving electrodes constitute a group of driving electrodes that are simultaneously driven, except for the last N driving electrodes, and the number of driving electrodes of N being a group of driving electrodes is reduced by one. The supply of the drive signal may be provided by the aforementioned drive circuit 41. Then, as shown in step 830, one-dimensional sensing information is acquired by the detecting electrode each time the driving signal is supplied, to obtain a multi-electrode driving one-dimensional sensing in the multi-electrode driving mode. The information and the one-dimensional sensing information of the first side and the second side single electrode driving are obtained in the single electrode driving mode. E.g, In the multi-electrode driving mode, one-electrode-driven one-dimensional sensing information is respectively obtained when each group of driving electrodes is supplied with a driving signal. For example, in the single-electrode driving mode, when the first driving electrode and the last driving electrode provide the driving signal, respectively, a first-side single-electrode driving one-dimensional sensing information and a second-side single-electrode driving one are obtained. Dimensional sensing information. The acquisition of the one-dimensional sensing information may be obtained by the detecting circuit 42 described above. The one-dimensional sensing information includes one-dimensional sensing information (inward image) driven by the multi-electrode and one-dimensional sensing information driven by the first side and the second side single electrode. Then, as shown in step 840, the first-dimensional sensing information of the first-side single-electrode driving, the one-dimensional sensing information of all the multi-electrode driving, and the one-dimensional sensing information of the second-side single-electrode driving are sequentially followed. Generate an image (extended image). Step 840 can be accomplished by the aforementioned control circuitry.

As described earlier, the potential of the driving signal in the single-electrode driving mode is not necessarily the same as the potential of the driving signal in the multi-electrode driving mode, and may be the same or different. For example, the single electrode driving is driven by a large first alternating current potential, and the ratio of the first alternating current potential to the second alternating current potential is a predetermined ratio with respect to the second alternating current potential driven by the multi-electrode. In addition, step 840 is to generate the image according to all the values of the one-dimensional sensing information driven by the first side and the second side single electrode being multiplied by the same or different preset ratios respectively. Further, the frequency of the drive signal in the single-electrode drive mode is different from the frequency of the drive signal in the multi-electrode drive mode.

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

Similarly, when the number of driving electrodes of a group of driving electrodes is plural (two or more), each driving electrode respectively corresponds to a first dimension coordinate, wherein one-dimensional sensing information of each multi-electrode driving respectively corresponds to a first one-dimensional coordinate centered between the two driving electrodes of the driving electrode, and one-dimensional sensing information driven by the first side and the second side single electrode respectively corresponding to the first The first dimension coordinate with the last drive electrode.

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

Please refer to FIG. 9A and FIG. 9B , which are schematic diagrams for detecting that a conductive strip receives a capacitive coupling signal via a driving strip. Since the signal passes through some load circuit, such as capacitive coupling, the phase difference between the signal received by the detecting strip and the signal supplied to the driving strip is generated. For example, the drive signal is provided to the When driving a conductive strip, the first signal detected by the conductive strip and the signal supplied to the driving strip will generate a first phase difference ψ1, as shown in FIG. 9A, and the driving signal is supplied to the second driving strip. When the first signal detected by the conductive strip and the signal supplied to the driving strip are generated, a second phase difference ψ2 is generated, as shown in FIG. 9B.

The first phase difference ψ1 and the second phase difference ψ2 may differ depending on the RC circuit through which the drive signal passes. When the periods of the driving signals are the same, different phase differences indicate that the signal delays are received at different times. If the phase difference is directly ignored, the starting phase of the signal measurement is different and different results are produced. For example, suppose the phase difference is 0, and the signal is a sine wave, and the amplitude is A. When measuring signals at phases of 30 degrees, 90 degrees, 150 degrees, 210 degrees, 270 degrees, and 330, |1/2A|, |A|, |1/2A|, |-1/2A are obtained, respectively. |, |-A| and |-1/2A| signals. However, when the phase difference is 150 degrees, the phase of the measurement begins to be biased, so that when the phase measurement signals are 180 degrees, 240 degrees, 300 degrees, 360 degrees, 420 degrees, and 480, a value of 0 is obtained. , , 0, versus signal of.

From the foregoing example, it can be seen that the delay of the initial phase of the measurement due to the aforementioned phase difference causes the result of the signal measurement to be completely different, regardless of whether the driving signal is a sine wave or a square wave (such as PWM). The difference exists.

In addition, each time a driving signal is supplied, it may be provided to an adjacent plurality of driving conductive strips, wherein the driving conductive strips are sequentially arranged in parallel. In the preferred embodiment of the invention, the two adjacent driving strips are provided, so that in one scan, the n driving strips are supplied with n-1 driving signals, each time providing a set of driving strips. For example, the first and second drive conductive strips are provided for the first time, the second and third drive conductive strips are provided for the second time, and so on. As previously described, each time a drive signal is provided, the set of drive strips provided may be one, two or more strips, and the present invention does not limit the number of drive strips provided per drive signal. Each time the driving signal is provided, all the signals for detecting the measured strips can be combined into one-dimensional sensing information, and all the one-dimensional sensing information in one scan can form a two-dimensional sensing information, which can be regarded as one. image.

Accordingly, in a first embodiment of the preferred mode of the present invention, different phase differences are used for different conductive strips to delay the detection signal. For example, a plurality of phase differences are first determined, and when each group of driving strips is supplied with a driving signal, the signals are measured according to each phase difference, and the phase difference according to the largest one of the measured signals is closest. The phase difference between the signal supplied to the front of the driving strip and the signal after the detecting strip is received is referred to as the closest phase difference in the following description. The measurement of the signal may be selecting one of the detecting conductive strips to measure according to each phase difference, or selecting a plurality of or all detecting conductive strips to measure according to each aberration, according to multiple or all Detect the sum of the signals of the conductive strips To determine the closest phase difference. According to the above, the closest phase difference of each set of conductive strips can be judged. In other words, when each set of conductive strips is supplied with a driving signal, all the detected conductive strips are delayed by the closest phase difference of the supplied driving signals. Make measurements.

In addition, the signal may not need to be measured according to all the aberrations, and the signal may be measured according to a phase difference in the phase difference(s) until the measured signal is incremented and then decremented. Stop, where the phase difference based on the largest of the measured signals is the closest phase difference. In this way, an image with a larger signal can be obtained.

In addition, a set of the driving conductive strips may be first selected as a reference conductive strip, and the other conductive strips are referred to as non-reference conductive strips, and the closest phase difference of the reference conductive strips is first detected as a level phase. Poor, and then detect the phase difference of the non-reference drive strip closest to the leveling phase difference, called the most leveling phase difference. For example, a signal measured according to the leveling phase difference of the reference conductive strip is used as a leveling signal, and each phase difference of each set of non-reference driving strips is separately measured, and the measured signal is the most connected. The phase difference on which the leveling signal is applied is the leveling phase difference of the driving conductive strip to which the driving signal is supplied. In this way, the leveling phase difference of each group of driving strips can be determined, and the measurement of the post-delay signal can be performed according to the leveling phase difference of each group of driving strips, so that a relatively flat image, that is, a difference between signals in the image can be obtained. Very small. In addition, the leveling signal can fall within a preset working range, and does not necessarily need to be the best. Big signal.

In the foregoing description, each time the drive signal is supplied, the same phase difference is used for all of the detected conductive strips, and those skilled in the art can infer that, each time a drive signal is supplied, each time A set of detecting conductive strips adopts respective closest phase difference or leveling phase difference. In other words, each time the driving signal is supplied, the signal is measured for each phase difference of each group of detecting strips to determine the closest phase difference or level difference.

In fact, in addition to using aberrations to delay the measurement to obtain larger or more horizontal images, it is also possible to obtain a relatively flat image with different magnification, impedance, and measurement time.

Accordingly, the present invention proposes a signal measurement method for a touch screen, as shown in FIG. As shown in step 1010, a touch screen is provided. The touch screen includes a plurality of conductive strips arranged in parallel and a plurality of strips of parallel detecting strips, the driving strips and the detecting conductive The strips overlap in multiple overlapping zones. Additionally, as shown in step 1020, a delay phase difference for each or each set of drive strips is determined. Then, as shown in step 1030, a driving signal is sequentially supplied to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals and the detecting conductive strips are mutually capacitively coupled. Next, as shown in step 1040, each time the drive signal is supplied, the signal of each detected combination of the supplied drive signals is delayed by the corresponding phase difference. Only after being measured.

Accordingly, in the signal measuring device of the touch panel of the present invention, the aforementioned step 1030 may be implemented by the aforementioned driving circuit 41. Additionally, step 1040 can be implemented by the aforementioned detection circuit 42.

In an example of the invention, the retardation phase difference of each or each set of drive strips is selected from a plurality of predetermined phase differences, such as picking the aforementioned nearest phase difference. Each set of conductive strips refers to a plurality of conductive strips that are simultaneously supplied with drive signals during a plurality of driving operations, for example, by the drive selection circuit 141 of the aforementioned drive circuit 41. For example, one or a set of conductive strips of the drive strips are sequentially selected as selected strips, as implemented by drive circuitry 41. Next, the delayed phase difference of the selected conductive strips is selected from a plurality of predetermined phase differences. Wherein, when the driving signal is supplied to the selected conductive strip, the signal measured after delaying the delayed phase difference is greater than the signal detected after delaying other predetermined phase differences. For example, it is implemented by the detection circuit 42 described above, and the detected delay phase difference can be stored in the storage circuit 43.

In addition, the aforementioned leveling phase difference may also be selected. For example, one or a set of conductive strips of the drive strips are selected as reference strips, and other strips or other sets of strips are used as non-reference strips, as implemented by drive circuitry 41. Thereafter, a delay phase difference of the reference conductive strip is selected from a plurality of predetermined phase differences, wherein when the driving signal is supplied to the reference conductive strip, the signal detected after delaying the delayed phase difference is greater than delaying other predetermined phase differences Detected signal of. The delay phase difference of the reference conductive strip is the aforementioned leveling phase difference. Next, the signal detected by delaying the delayed phase difference is used as a reference signal, and then one or a group of non-reference conductive strips of the non-reference conductive strip are sequentially selected as the selected conductive strip, and Determining a delay phase difference of the selected conductive strip from a plurality of predetermined phase differences, such as the most leveling phase difference described above, wherein the delayed phase difference is detected after the driving signal is supplied to the selected conductive strip The signal detected by the signal is closest to the reference signal compared to the signal delayed by other predetermined phase differences. The above may be implemented by the detection circuit 42.

In an example of the present invention, when the driving signal is supplied to the reference conductive strip or the selected conductive strip, the plurality of measured signals in the detecting conductive strip are detected by the detecting conductive strip One of the measured signals. In other words, the delay phase difference is selected based on the same signal that detects the conductive strip. In another example of the present invention, when the driving signal is supplied to the reference conductive strip or the selected conductive strip, the plurality of measured signals in the detecting conductive strip are detected by the detecting conductive At least two of the strips detect the sum of the signals measured by the strips. In other words, the delay phase difference is selected based on the sum of the signals of the same plurality of detecting conductive strips or all of the detecting conductive strips.

As previously described, there may be a corresponding delay phase difference for each or each set of overlapping regions of the driven conductive strip that overlap each of the detecting conductive strips. In the following description, each or each group drives the conductive strips and overlaps each One or each set of detection strips acts as a detection combination. In other words, the drive signal can be provided to one or more drive strips simultaneously, and the signal can also be measured by one or more sense strips. When a signal is generated by measurement, one or more driving strips provided by the driving signal and one or more detecting strips being measured are referred to as a detecting combination. For example, in a single drive or multiple drives, the signal value is measured by a conductive strip, or a difference is measured by two conductive strips, or a double difference is measured by three conductive strips. The difference is the difference between the signals of the two adjacent conductive strips, and the double difference is among the three adjacent conductive strips, and the difference between the signals of the first two conductive strips is subtracted from the difference between the signals of the two conductive strips. difference.

Accordingly, in another example of the present invention, a signal measurement method of a touch screen is shown in FIG. As shown in step 1110, a touch screen is provided. The touch screen includes a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the detecting conductive The strips overlap in multiple overlapping zones. In addition, as shown in step 1120, each or each group of conductive strips is driven and each strip or each set of detecting strips is overlapped as a detection combination, and as shown in step 1130, each detection is determined. A delayed phase difference of the combination. Thereafter, as shown in step 1140, a driving signal is sequentially supplied to one or a group of the driving conductive strips, and the driving conductive strips and overlapping detectors of the driving signals provided in the detecting combination of the driving signals are provided. The conductive strips are tested for mutual capacitive coupling. Next, as shown in step 1150, at Each time a drive signal is supplied, the signal of each detected combination of the supplied drive signals is measured after delaying the corresponding phase difference.

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

In an example of the present invention, the step 1130 may include: sequentially selecting one of the detection combinations as the selected detection combination, which may be implemented by the foregoing driving circuit 41; and by a plurality of predetermined phase differences Selecting a delay phase difference of the selected detection combination, wherein when the driving signal is provided to the selected detection combination, the signal measured after delaying the delay phase difference is greater than the signal detected after delaying other predetermined phase differences It can be implemented by the aforementioned detection circuit 42.

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

In a second embodiment of the present invention, the signal is measured by a control circuit, and the signals of each group of detecting conductive strips are respectively measured through a variable resistor, and the control circuit is driven according to each group. The conductive strip determines the impedance of the variable resistor. For example, a set of the drive strips is first selected as a reference strip, and the other strips are referred to as non-reference strips. First, a plurality of preset impedances are set, and a signal for detecting the conductive strips is detected when the reference conductive strips (possibly one or more) are supplied with the driving signals, or signals of the plurality of or all of the detected conductive strips are detected. Add up as a leveling signal. In addition, the leveling signal may fall within a predetermined working range and does not necessarily need to be the best or maximum signal. In other words, any preset impedance that can cause the leveling signal to fall within the preset operating range can be used as the leveling impedance of the reference strip. Next, when each set of non-reference conductive strips is supplied with a driving signal value, the variable resistor is respectively adjusted according to each preset impedance, and the signal of the detecting strip is detected, or the plurality or all of the detecting strips are detected. The sum of the signals of the conductive strips is measured to compare the preset impedance of the most advanced leveling signal as a leveling impedance relative to the set of non-reference conductive strips to which the drive signal is supplied. In this way, the leveling impedance of each group of driving strips can be determined, according to each A set of leveling impedances that drive the conductive strips to adjust the impedance of the variable resistor (adjusting the variable resistor to the leveling impedance) results in a more levelable image, ie, the difference between the signals in the image is small.

In the foregoing description, each time the drive signal is supplied, the same leveling impedance is used for all of the detected conductive strips, which can be inferred by those skilled in the art, or each time a drive signal is supplied, A set of detecting conductive strips adopts respective leveling impedances. In other words, each time the driving signal is supplied, the measurement of each predetermined impedance of each group of detecting strips is performed to determine the predicted impedance of the closest leveling signal, thereby obtaining each A set of driving conductive strips is provided with a leveling impedance of each of the strips when the driving signal is supplied to respectively adjust the impedance of the variable resistor electrically coupled to each of the detecting strips.

The aforementioned 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 into the IC, and the impedance of the variable resistor may be controlled by a programmable program such as a 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 on and off of different switches, since the variable resistor and the programmable program are well-known technologies. , will not repeat them here. The variable resistors in the IC can be controlled by the programmable program to be applied to different characteristics of the touch panel via the body correction method, which can effectively reduce the cost and achieve commercial mass production.

In a third embodiment of the present invention, the signal is measured by a control circuit, and the signals of each group of detecting conductive strips are respectively measured by a measuring circuit (such as an integrator), and the control circuit is based on Each set of drive strips determines the magnification of the measurement circuit. For example, a set of the drive strips is first selected as a reference strip, and the other strips are referred to as non-reference strips. First, a plurality of preset magnifications are set, and a signal for detecting the conductive strips is detected when the reference conductive strips (possibly one or more) are supplied with driving signals, or signals for detecting multiple or all of the conductive strips are detected. The sum of the signals is used as a leveling signal. In addition, the leveling signal may fall within a predetermined working range and does not necessarily need to be the best or maximum signal. In other words, any preset magnification that can cause the leveling signal to fall within the preset working range can be used as the leveling magnification of the reference conductive strip. Next, when each set of non-reference conductive strips is provided with a driving signal value, the measuring circuit is respectively adjusted according to each preset magnification, and the signal of the detecting conductive strip is detected, or the plurality or all of the detecting strips are detected. A summation of the signals of the conductive strips is detected to compare the preset magnification of the most advanced leveling signal as a leveling magnification of the set of non-reference conductive strips to which the drive signal is supplied. In this way, the leveling magnification of each group of driving strips can be determined, and the magnification of the measuring circuit can be adjusted according to the leveling magnification of each group of driving strips, so that a relatively flat image can be obtained, that is, between the signals in the image. The difference is small.

In the foregoing description, each time the drive signal is supplied, the same level of magnification is used for all of the detected conductive strips, which is common in the art. The technician can infer that each set of detecting conductive strips adopts a respective leveling magnification when each driving signal is supplied. In other words, each time the driving signal is supplied, the signal is measured for each preset magnification of each group of detecting strips to determine the predicted magnification of the closest leveling signal, respectively. The leveling magnification of each of the detected conductive strips is obtained when each set of driving conductive strips is supplied with a driving signal.

In a fourth embodiment of the present invention, the signal is measured by a control circuit, and each group of signals for detecting the conductive strips is respectively measured by a measuring circuit (such as an integrator), and the control circuit is based on Each set of drive strips determines the measurement time of the measurement circuit. For example, a set of the drive strips is first selected as a reference strip, and the other strips are referred to as non-reference strips. First, a plurality of preset measurement times are set, and a signal for detecting the conductive strip is detected when the reference conductive strip (possibly one or more) is supplied with the driving signal, or a plurality of or all detecting conductive strips are detected. The sum of the signals is used as a leveling signal. In addition, the leveling signal may fall within a predetermined working range and does not necessarily need to be the best or maximum signal. In other words, any preset measurement time that can cause the leveling signal to fall within the preset working range can be used as the leveling measurement time of the reference conductive strip. Next, when each set of non-reference conductive strips is supplied with a driving signal value, the measuring circuit is respectively adjusted according to each preset measuring time, and the signal of the detecting conductive strip is detected, or the plurality of strips or signals are detected. All of the signals of the detected conductive strips are summed to compare the preset measurement time of the most connected leveling signal as a relative drive The leveling time of the set of non-reference conductive strips of the dynamic signal. In this way, the leveling measurement time of each group of driving strips can be determined, and the measuring time of the measuring circuit can be adjusted according to the leveling measurement time of each group of driving strips, so that a relatively flat image, that is, an image in the image, can be obtained. The difference between the signals is small.

In the foregoing description, each time the drive signal is supplied, the same leveling time is used for all of the detected conductive strips, which can be inferred by those skilled in the art, or each time a drive signal is supplied. Each group of detecting conductive strips adopts respective leveling measurement times. In other words, each time the driving signal is supplied, the measurement of each preset measurement time of each group of detecting strips is performed to determine the predicted measuring time of the closest leveling signal. This obtains the leveling measurement time of each of the detecting conductive strips when each set of driving conductive strips is supplied with a driving signal.

In the foregoing description, one or a plurality of mixed implementations may be selected from the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment, and the present invention is not limited thereto. In addition, when measuring the leveling signal, one or more detecting conductive strips farthest from the measuring circuit may be selected for signal detection to generate a leveling signal. For example, the farthest signal of the detecting strip can be used to generate the leveling signal, or the farthest detecting the differential signal of the strip to generate the leveling signal (difference value), or the farthest three detectors The difference between the differential signals of the first two and the last two detecting conductive strips in the conductive strip is measured to generate a leveling signal (double difference). In other words, the leveling signal can be a signal value, a difference value or a double difference value, It can be other values generated from one or more signals that detect the conductive strip.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the claims of the present invention; any equivalent changes or modifications which are made in the spirit of the present invention should be included in the following. The scope of the patent application.

11‧‧‧ clock circuit

12‧‧‧ Pulse width adjustment circuit

131‧‧‧Drive Switch

132‧‧‧Detection switch

141‧‧‧Drive selection circuit

142‧‧‧Detection selection circuit

151‧‧‧ drive electrodes

152‧‧‧Detection electrode

16‧‧‧Variable resistor

17‧‧‧Amplification circuit

18‧‧‧Measurement circuit

19‧‧‧External conductive objects

41‧‧‧Drive circuit

42‧‧‧Detection circuit

43‧‧‧Storage circuit

44‧‧‧ Frequency setting

51‧‧‧Complete image

52‧‧‧One-dimensional sensing of single-electrode drive News

61‧‧‧Retracted image

62‧‧‧One-dimensional sensing of two-electrode drive News

71‧‧‧Extended image

45‧‧‧ Controller

721‧‧‧One-dimensional sensing information for the first side single-electrode drive

722‧‧‧One-dimensional sensing information for the second side single-electrode drive

S‧‧‧ drive signal

1 and FIG. 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 two-electrode driving mode; FIG. 3A and FIG. FIG. 5 is a schematic diagram of generating a complete image; FIG. 6 is a schematic diagram of generating a retracted image; FIG. 7A and FIG. 7B are schematic diagrams of generating an expanded image; FIG. 8 is a schematic diagram of a method for detecting a capacitive touch screen; FIG. A schematic diagram of a process for generating an expanded image according to the present invention; FIGS. 9A and 9B are schematic diagrams showing different phase differences of driving signals via different driving conductive strips; FIG. 10 and FIG. 11 are schematic flowcharts of a signal measurement method of a touch screen according to a first embodiment of the present invention.

Step 1010‧‧ Providing a capacitive touch screen having a plurality of driving electrodes and a plurality of detecting electrodes arranged in parallel in sequence

Step 1020‧‧‧Determine a delay phase of each or each set of drive strips difference

Step 1030‧‧ ‧ sequentially providing a driving signal to one or a group of the driving conductive strips, and the driving conductive strips provided with the driving signals and the detecting conductive strips generate mutual capacitive coupling

Step 1040‧‧‧ When each driving signal is supplied, the signal of each detected combination of the supplied driving signals is measured after delaying the corresponding phase difference

Claims (20)

A method for measuring a signal of a touch screen, comprising: providing a touch screen, the touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the Detecting conductive strips overlap in a plurality of overlapping regions; determining a delayed phase difference of each or each set of driving conductive strips; sequentially providing a driving signal to one or a group of the driving conductive strips, a driving conductive strip provided with a driving signal and a mutual capacitive coupling of the detecting conductive strip; and delaying a delay phase corresponding to one or a group of driving conductive strips of the supplied driving signal each time the driving signal is supplied Determining the conductive strip measurement signal by at least one of the detecting conductive strips; wherein determining a delay phase difference of each or each set of driving conductive strips comprises: sequentially selecting the driving conductive strips One or a set of conductive strips as the selected conductive strip; and a delayed phase difference of the selected conductive strips selected from the plurality of predetermined phase differences, wherein the drive signal is provided to be selected When the bus bars, the phase delay amount of the delay measurement signal is greater than another predetermined delayed signal to the phase difference detector. According to the signal measurement method of claim 1, wherein when the driving signal is supplied to the selected conductive strip, the plurality of measured signals in the detecting conductive strip are detected by the detecting The sum of the signals measured by one of the conductive strips. According to the signal measurement method of claim 1, wherein when the driving signal is supplied to the selected conductive strip, the plurality of measured signals in the detecting conductive strip are detected by the detecting At least two of the conductive strips detect the sum of the signals measured by the conductive strips. A method for measuring a signal of a touch screen, comprising: providing a touch screen, the touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the Detecting conductive strips overlap in a plurality of overlapping regions; driving each of the conductive strips and each of the sets of detecting conductive strips as a detection combination; determining each detection combination a delay phase difference; sequentially providing a driving signal to one or a group of the driving conductive strips, the driving conductive strips provided with the driving signals in the detecting combination of the driving signals and the overlapping detecting conductive The strips produce mutual capacitive coupling; and each time the drive signal is provided, the signal of each detected combination of the provided drive signals is measured after delaying the corresponding phase difference. According to the signal measurement method of claim 4, wherein determining the delay phase difference of each detection combination comprises: sequentially selecting one of the detection combinations as the selected detection combination; and by a plurality of predetermined phases Selecting a delay phase difference of the selected detection combination, wherein when the driving signal is provided to the selected detection combination, the signal measured after delaying the delay phase difference is greater than the delay after detecting the other predetermined phase difference signal of. According to the signal measurement method of claim 4, wherein determining the delay phase difference of each detection combination comprises: selecting one of the detection combinations as a reference detection combination, and other detection combinations as non-reference detection Combining; selecting a delay phase difference of the reference detection combination from among a plurality of predetermined phase differences, wherein when the driving signal is supplied to the reference detection combination, the signal detected after delaying the delay phase difference is greater than delaying other predetermined phases The signal detected after the difference; The signal detected by the reference detection combination delaying the delayed phase difference is used as a reference signal; one of the non-reference detection combinations is sequentially selected as the selected detection combination; and selected from a plurality of predetermined phase differences a delay phase difference of the selected detection combination, wherein when the driving signal is supplied to the selected detection combination, the signal detected after delaying the delayed phase difference is detected after delaying the delay of other predetermined phase differences The signal is closest to the reference signal. A signal measuring device for a touch screen, comprising: a touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the detecting The conductive strips overlap the plurality of overlapping regions; a driving circuit sequentially provides a driving signal to one or a group of the driving conductive strips, the driving conductive strips for providing the driving signals and the detecting The conductive strips are mutually capacitively coupled, wherein each or each set of drive strips corresponds to a delay phase difference; and a detection circuit determines a delay phase difference of each or each set of drive strips and drives each time When the signal is provided, delaying the delay phase difference corresponding to one or a group of driving conductive strips of the provided driving signal, the conductive strip measuring signal is detected by at least one of the detecting conductive strips, wherein the driving circuit further comprises Selecting one or a group of conductive strips of the driving conductive strips as devices for selecting the conductive strips, and the detecting circuit further comprises selecting one of a plurality of predetermined phase differences to be selected Means for delaying a phase difference of the electrical strip, which is provided to the conductive strips is selected, the phase delay amount of the delay of the measured signal is greater than the other delayed signal to a predetermined phase difference detected in the drive signal. According to the signal measuring device of claim 7, wherein the driving signal is supplied to the selected conductive strip, the plurality of measured signals in the detecting conductive strip The number is the sum of the signals measured by one of the detected conductive strips. According to the signal measuring device of claim 7, wherein the driving signal is supplied to the selected conductive strip, the plurality of measured signals in the detecting conductive strip are detected by the detecting At least two of the conductive strips detect the sum of the signals measured by the conductive strips. A signal measuring device for a touch screen, comprising: a touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the detecting Measuring a conductive strip overlapping the plurality of overlapping regions; a driving circuit sequentially providing a driving signal to one or a group of the driving conductive strips, and providing a driving signal in the detecting combination of the driving signals The driving conductive strip and the overlapping detecting conductive strips generate mutual capacitive coupling, wherein each or each group of driving conductive strips and respectively overlapping each or each set of detecting conductive strips as a detecting combination and each detecting The measurement combination corresponds to a delay phase difference; and a detection circuit is measured after each detection signal of the drive signal is delayed by a corresponding phase difference each time the drive signal is supplied. According to the signal measuring device of claim 10, wherein the driving circuit sequentially selects one of the detecting combinations as the selected detecting combination; and the detecting circuit selects the selected ones from the plurality of predetermined phase differences. The combined delay phase difference is measured, wherein when the driving signal is supplied to the selected detection combination, the signal measured after delaying the delayed phase difference is greater than the signal detected after delaying other predetermined phase differences. The signal measuring device according to claim 10, wherein the driving circuit selects one of the detecting combinations as a reference detecting combination, and the other detecting combinations are used as a non-reference detecting combination, and the driving circuit sequentially selects the One of the non-reference detection combinations is selected as the detection combination; and the detection circuit selects the delay phase difference of the reference detection combination from among the plurality of predetermined phase differences, wherein when the driving signal is supplied to the reference detection combination, The signal detected after delaying the delay phase difference is greater than the delay The signal detected after the other predetermined phase difference is delayed, and the detecting circuit is configured to delay the detected phase difference difference signal as the reference signal, and the selected one of the plurality of predetermined phase differences is selected. Detecting a combined delay phase difference, wherein when the driving signal is supplied to the selected detection combination, the signal detected after delaying the delayed phase difference is closest to the signal detected after delaying other predetermined phase differences On the reference signal. A method for measuring a signal of a touch screen, comprising: providing a touch screen, the touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the Detecting conductive strips overlap in a plurality of overlapping regions; determining a delayed phase difference of each or each set of driving conductive strips; sequentially providing a driving signal to one or a group of the driving conductive strips, a driving conductive strip provided with a driving signal and a mutual capacitive coupling of the detecting conductive strip; and delaying a delay phase corresponding to one or a group of driving conductive strips of the supplied driving signal each time the driving signal is supplied Determining the conductive strip measurement signal by at least one of the detecting conductive strips; wherein determining a delay phase difference of each or each set of driving conductive strips comprises: selecting one of the driving conductive strips or A set of conductive strips is used as a reference conductive strip, and other strips or other sets of conductive strips are used as non-reference conductive strips; a delay phase difference of the reference conductive strips is selected from a plurality of predetermined phase differences, When the driving signal is supplied to the reference conductive strip, the signal detected after delaying the delayed phase difference is greater than the signal detected after delaying the predetermined predetermined phase difference; and the delayed conductive phase difference is detected by the reference conductive strip a signal as a reference signal; sequentially selecting one or a group of non-reference conductive strips of the non-reference conductive strip a strip as the selected strip; and a delay phase difference of the selected strip selected from the plurality of predetermined phase differences, wherein the delayed phase difference is detected after the driving signal is supplied to the selected strip The signal detected by the signal is closest to the reference signal compared to the signal delayed by other predetermined phase differences. According to the signal measurement method of claim 13, wherein when the driving signal is supplied to the reference conductive strip or the selected conductive strip, the plurality of measured signals in the detecting conductive strip are The signal for detecting one of the conductive strips is described. According to the signal measurement method of claim 13, wherein when the driving signal is supplied to the reference conductive strip or the selected conductive strip, the plurality of measured signals in the detecting conductive strip are The sum of the signals of the at least two detecting strips detecting the strips is detected. A signal measuring device for a touch screen, comprising: a touch screen comprising a plurality of conductive strips arranged in parallel and a plurality of strips of conductive strips arranged in parallel, the driving strips and the detecting The conductive strips overlap the plurality of overlapping regions; a driving circuit sequentially provides a driving signal to one or a group of the driving conductive strips, the driving conductive strips for providing the driving signals and the detecting The conductive strips are mutually capacitively coupled, wherein each or each set of drive strips corresponds to a delay phase difference; and a detection circuit determines a delay phase difference of each or each set of drive strips and drives each time When the signal is provided, delaying the delay phase difference corresponding to one or a group of driving strips of the provided driving signal, the strip measuring signal is detected by at least one of the detecting strips, wherein the driving circuit selects The device for driving one or a group of conductive strips of the conductive strip as a reference conductive strip, using other strips or other sets of conductive strips as non-reference conductive strips, and the driving circuit is sequentially selected A non-reference or non-reference conductive strip of conductive strips of said set is selected as the conductive strips; electrically detected Routing a plurality of predetermined phase differences to select a delay phase difference of the reference conductive strip, wherein when the driving signal is supplied to the reference conductive strip, the signal detected after delaying the delayed phase difference is greater than the delay after detecting other predetermined phase differences a signal to be detected, and the detecting circuit delays the delayed phase difference detected by the reference conductive strip as a reference signal, and selects a delayed phase difference of the selected conductive strip from the plurality of predetermined phase differences, wherein When the driving signal is supplied to the selected conductive strip, the signal detected after delaying the delayed phase difference is closest to the reference signal than the signal detected after delaying other predetermined phase differences. According to the signal measuring device of claim 16, wherein the driving signal is supplied to the reference conductive strip or the selected conductive strip, the plurality of measured signals in the detecting conductive strip are The signal for detecting one of the conductive strips is described. According to the signal measuring device of claim 16, wherein the driving signal is supplied to the reference conductive strip or the selected conductive strip, the plurality of measured signals in the detecting conductive strip are The sum of the signals of the at least two detecting strips detecting the strips is detected. A signal measurement processor for a touch screen performs the following steps: sequentially selecting one or a group of driving conductive strips in the touch screen as selected conductive strips; and selecting a delayed phase difference of the selected conductive strips from a plurality of predetermined phase differences And wherein when the driving signal is supplied to the selected conductive strip, the signal measured after delaying the delayed phase difference is greater than the signal detected after delaying other predetermined phase differences; sequentially providing a driving signal to the driving One or a group of the conductive strips, the driving conductive strips provided with the driving signals and the plurality of detecting conductive strips in the touch screen are mutually capacitively coupled; and each time the driving signal is provided, the delay corresponds to the supplied driving signal The strip measurement signal is detected by at least one of the detecting strips after the delay phase difference of one or a group of driving strips. A signal measurement processor for a touch screen performs the following steps: selecting one or a group of driving conductive strips in the touch screen as reference conductive strips, and other strips or other sets of conductive strips as non-reference conductive strips; selecting from a plurality of predetermined phase differences a delay phase difference of the reference conductive strip, wherein when the driving signal is supplied to the reference conductive strip, the signal detected after delaying the delayed phase difference is greater than the signal detected after delaying other predetermined phase differences; Delaying the signal detected after the delay phase difference as a reference signal; sequentially selecting one or a group of non-reference conductive strips of the non-reference conductive strip as selected conductive strips; and selecting from a plurality of predetermined phase differences And a delayed phase difference of the selected conductive strip, wherein when the driving signal is supplied to the selected conductive strip, the signal detected after delaying the delayed phase difference is compared with the signal detected after delaying other predetermined phase differences Proximate to the reference signal; sequentially providing a driving signal to one or a group of the driving conductive strips, being driven by the driving signal The strips are mutually capacitively coupled to the detecting conductive strips; and each time the driving signal is provided, delaying a delay phase difference corresponding to one or a group of driving conductive strips of the supplied driving signal is performed by the Detecting at least one detecting strip measurement signal of the conductive strip.