TW201734741A - Touch processor and method - Google Patents

Abstract

The invention discloses a touch processor and method, applied to a touch screen including M drive electrodes and N sense electrodes, wherein the touch processor executes the following steps: determining at least one first drive electrode and at least one first sense electrode touched or approached by a first external object; and performing a first mutual capacitive detection of X of the M drive electrodes and Y of the N sense electrodes, wherein the X drive electrodes comprises the at least one first drive electrode, and the Y sense electrodes comprises the at least one first sense electrode, wherein X is less than M, and Y is less than or equal to N.

Description

Touch processor and touch method

The present invention relates to a touch processor and a touch method, and more particularly to a touch processor and a touch method for detecting the movement of an external object.

A conventional mutual capacitive sensor includes an insulating surface layer, a first conductive layer, a dielectric layer, and a second conductive layer, wherein the first conductive layer and the second conductive layer respectively have a plurality of first conductive layers The strip and the second conductive strip may be composed of a connecting line of a plurality of conductive sheets and a series of conductive sheets.

When performing mutual capacitance detection, one of the first conductive layer and the second conductive layer is driven, and the other of the first conductive layer and the second conductive layer is detected. For example, driving signals are supplied to each of the first conductive strips one by one, and corresponding to each of the first conductive strips to which the driving signals are supplied, detecting signals of all the second conductive strips to represent the first conductive provided with the driving signals A capacitive coupling signal at the intersection of the strip and all of the second strips. Thereby, a capacitive coupling signal representing the intersection between all the first conductive strips and the second conductive strip can be obtained as a capacitance value image.

Accordingly, it is possible to obtain a capacitance value image when the touch is not touched as a reference, and determine whether the external conductive object is approached or covered by the difference between the comparison reference and the subsequently detected capacitance value image, and further Determine the location that is approached or covered.

However, if there is a conductive material crossing two or more conductive strips on the insulating surface layer, when it is not approached or covered by the external conductive object, the capacitance value image may be changed due to the capacitive coupling between the conductive material and the conductive strip. And caused a misjudgment. For example, water stains on the insulating surface When more than two conductive strips are crossed, the capacitance value image will change, which is mistaken for finger pressure.

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.

The object of the present invention and solving the technical problems thereof are achieved by the following technical solutions. A touch control device according to the present invention is electrically coupled to a touch panel, the touch panel includes M driving electrodes and N sensing electrodes, wherein the touch processor performs the following steps: determining a first external At least one first driving electrode and at least one first sensing electrode that are touched or approached by the object; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, wherein the X driving electrodes The at least one first driving electrode is included, and the Y sensing electrodes comprise the at least one first sensing electrode, X is smaller than M, and Y is less than or equal to N.

The object of the present invention and solving the technical problems thereof can also be achieved by the following technical solutions. A touch method according to the present invention is applied to a touch panel, the touch panel includes M driving electrodes and N sensing electrodes, wherein the touch processor performs the following steps: determining a first external object touch Touching or approaching at least one first driving electrode and at least one first sensing electrode; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, wherein the X driving electrodes comprise the At least one first driving electrode, the Y sensing electrodes include the at least one first sensing electrode, X is smaller than M, and Y is less than or equal to N.

The object of the present invention and solving the technical problem thereof may also be to adopt the following technical methods. The case was realized. A touch control device is electrically coupled to a touch panel. The touch panel includes a plurality of first conductive strips and a plurality of second conductive strips, wherein the touch processor performs the following steps: And providing a driving signal to all of the first conductive strips; detecting, when each of the first conductive strips is provided with a driving signal, detecting signals of all the second conductive strips to obtain a first dimension sensing corresponding to the first conductive strips Information: generating a first dimension sensing information according to all the first dimension sensing information; determining, according to the first dimension sensing information, whether at least one external object approaches or covers the touch panel; When the dimension sensing information determines that at least one external object approaches or covers the touch panel, the touch processor further performs the following steps: determining, according to the first dimension sensing information, that the at least one external object is approaching or Covering at least one first dimension dimension and at least one second dimension dimension of the touch panel; respectively according to the at least one first dimension dimension and the at least one second dimension Determining at least one mutual capacitance detection range, and performing mutual capacitance detection on the at least one mutual capacitance detection range to generate a second 贰 dimensional sensing corresponding to the at least one mutual capacitance detection range And determining, according to the second dimension sensing information, at least one third dimension coordinate and at least one fourth dimension coordinate.

100‧‧‧ position detection device

110‧‧‧ display

120‧‧‧Touch panel

120A‧‧‧First sensing layer

120B‧‧‧Second Sensing Layer

130‧‧‧Drive/Detection Unit

140‧‧‧ Conductive strip

160‧‧‧ Controller

161‧‧‧ processor

162‧‧‧ memory

170‧‧‧Host

171‧‧‧Central Processing Unit

173‧‧‧ storage unit

11,13,14,16‧‧‧conductive sheets

12‧‧‧second cable

15‧‧‧First cable

17‧‧‧Insulation base

18‧‧‧Insulation

19‧‧‧Insulation surface

21‧‧‧Shielding strips

140B, 22‧‧‧second conductive strip

140A, 23‧‧‧ first conductive strip

24‧‧‧ openings

25‧‧‧Conductor

PWM‧‧‧ pulse width modulation signal

S‧‧‧ signal

71‧‧‧First touch panel

72‧‧‧Second touch panel

73, 74‧‧‧ Conductive strips coupled to ground potential

802-822‧‧‧Steps

EO1‧‧‧ first external object

EO2‧‧‧Second external object

1A and 1B are schematic views of a position detecting system.

1C to 1F are schematic structural views of a sensing layer.

2A and 2B are schematic views of a capacitive sensor with a shielded conductive strip.

2C is a schematic diagram of two-dimensional mutual capacitance detection.

2D is a schematic diagram of full screen drive detection.

FIG. 2E is a schematic flow chart of performing full-screen drive detection and then performing two-dimensional mutual capacitance detection according to the first embodiment of the present invention.

3 is a diagram showing full-screen driving detection and two-dimensional mutual capacitance according to a second embodiment of the present invention. The result of the type detection is a schematic diagram of the process of determining the position.

4A to FIG. 4C are schematic diagrams showing the process of judging a position according to the result of full-screen driving detection and mutual capacitance detection according to the third embodiment of the present invention.

FIG. 5A is a schematic flow chart of an update reference according to a fourth embodiment of the present invention.

FIG. 5B is a schematic flow chart of an update reference according to a fifth embodiment of the present invention.

FIG. 6 is a schematic flow chart of communication of a touch panel according to a sixth embodiment of the present invention.

FIG. 7 is a schematic diagram of communication performed by a touch panel according to a seventh embodiment of the present invention.

FIG. 8 is a schematic flow chart of a touch method according to an embodiment of the invention.

FIG. 9A is a schematic diagram of detecting a first external object in a first period of time.

FIG. 9B is a schematic diagram of detecting a first external object in a second time period.

FIG. 10A is a schematic diagram of detecting a first external object and a second external object in a first period of time.

FIG. 10B is a schematic diagram of detecting a first external object and a second external object in a second time period.

The invention will be described in detail below with some embodiments. However, the scope of the present invention is not limited by the embodiments, except as to the disclosed embodiments, which are subject to the scope of the claims. In order to provide a clearer description and to enable those skilled in the art to understand the present invention, the various parts of the drawings are not drawn according to their relative sizes, and the ratio of certain dimensions or other related scales may be highlighted. It is exaggerated to come out, and the irrelevant details are not completely drawn, in order to simplify the illustration.

Referring to FIG. 1A , the present invention provides a position detecting device 100 including a touch panel 120 and a driving/detecting unit 130 . The touch panel 120 has a sensing layer. In an example of the present invention, a first sensing layer 120A and a second sensing layer 120B may be included. The sensing layer 120A and the second sensing layer 120B respectively have a plurality of conductive strips 140, wherein the plurality of first conductive strips 140A of the first sensing layer 120A and the plurality of second conductive strips 140B of the second sensing layer 120B intersect Stack. In another example of the present invention, the plurality of first conductive strips 140A and second conductive strips 140B may be disposed in a coplanar sensing layer. The driving/detecting unit 130 generates a sensing information according to the signals of the plurality of conductive strips 140. For example, in the self-capacitance detection, the driven conductive strip 140 is detected, and in the mutual capacitance detection, a part of the conductive strip 140 that is not directly driven by the driving/detecting unit 130 is detected. In addition, the touch panel 120 may be disposed on the display 110. The touch panel 120 and the display 110 may be provided with a shielding layer (not shown) or a shielding layer. In a preferred embodiment of the present invention, in order to make the thickness of the touch panel 120 thinner, no shielding layer is disposed between the touch panel 120 and the display 110.

The position detecting device 100 of the present invention may be applied to a computer system, as shown in FIG. 1B, including a controller 160 and a host 170. The controller includes a drive/detect unit 130 to operatively couple the touch panel 120 (not shown). In addition, the controller 160 can include a processor 161 that controls the driving/detecting unit 130 to generate sensing information, which can be stored in the memory 162 for access by the processor 161. In addition, the host 170 constitutes a main body of the computing system, and mainly includes a central processing unit 171, and a storage unit 173 for access by the central processing unit 171, and a display 110 for displaying the result of the operation.

In another example of the present invention, the controller 160 includes a transmission interface with the host 170, and the control unit transmits the data to the host through the transmission interface. Those skilled in the art may infer that the transmission interface includes but is not limited to UART, USB, Various wired or wireless transmission interfaces such as I2C, Bluetooth, WiFi, and IR. In an example of the present invention, the transmitted material may be a location (such as a coordinate), a recognition result (such as a gesture code), a command, a sensing information, or other controller 160. Information that can be provided.

In an example of the present invention, the sensing information may be initial sensing information generated by the processor 161, and the host 170 performs position analysis, such as position analysis, gesture determination, command recognition, and the like. . In another example of the present invention, the sensing information may be analyzed by the processor 161 first, and the determined position, gesture, command, and the like are delivered to the host 170. The present invention includes, but is not limited to, the foregoing examples, and one of ordinary skill in the art can infer the interaction between other controllers 160 and the host 170.

Referring to FIG. 1C , a pattern of a capacitive touch panel includes a plurality of conductive plates and a plurality of connecting lines. The connecting lines include a plurality of first connecting lines and a plurality of second connecting lines. The first connecting lines are arranged in a first direction (such as one of a lateral direction or a longitudinal direction) to connect a portion of the conductive sheets to form a plurality of conductive strips arranged in a first direction. Similarly, the second connecting lines are arranged in a second direction (such as the other of the lateral direction or the longitudinal direction) to connect the other portions of the conductive sheets to form a plurality of conductive strips arranged in the second direction.

The conductive strips (the first conductive strip and the second conductive strip) may be made of a transparent or opaque material, for example, may be made of transparent indium tin oxide (ITO). The structure can be divided into a single layer structure (SITO; Single ITO) and a double layer structure (DITO; Double ITO). The materials of other conductive strips can be inferred by those skilled in the art and will not be described again. For example, a carbon nanotube.

In this example, the longitudinal direction is taken as the first direction and the lateral direction is taken as the second direction, so that the longitudinal conductive strip is the first conductive strip and the lateral conductive strip is the second conductive strip. One of ordinary skill in the art can deduce that the above description is one of the examples of the invention and is not intended to limit the invention. For example, the lateral direction may be the first direction and the longitudinal direction may be the second direction. In addition, the number of the first conductive strips and the second conductive strips may be the same or different, for example, the first conductive strips have N strips, and the second conductive strips have M strips.

1E is a cross-sectional view taken along line II of FIG. 1C, including an insulating substrate 17, a portion of the second conductive strip (including the conductive sheet 11, the second connecting line 12, the conductive sheet 13), the insulating layer 18, and A portion of the first conductive strip (including the first connecting line 15) and the insulating surface layer 19. In an example of the present invention, the substrate 17, the insulating layer 18 and the insulating surface layer 19 may be formed of a transparent or opaque material such as a glass or a plastic film, and those skilled in the art may infer other examples of the present example. The manner of composition will not be described here.

In an example of the present invention, FIG. 1D is a cross-sectional view taken along line II-II of FIG. 1C, which is a schematic structural view of a double-layer capacitive touch panel, including an insulating substrate 17 and a second conductive strip. Parts (including the second connecting line 12), the insulating layer 18, and a portion of the first conductive strip (including the conductive sheet 14, the first connecting line 15, the conductive sheet 16) and the insulating surface layer 19. In other words, in an example of the present invention, the capacitive touch panel includes an insulating surface layer, a first sensing layer having the first conductive strip, an insulating layer, and a second conductive strip. The second sensing layer. In another example of the present invention, the capacitive touch panel is a rectangle having two opposite long sides and opposite two short sides, wherein the first conductive strip is arranged in parallel with the opposite two short sides, and the The second conductive strip is arranged in parallel with the opposite two long sides.

1F is a cross-sectional view of a single-layer capacitive touch panel, including an insulating substrate 17 and a portion of a second conductive strip (FIG. 1F). The second connecting line 12), the insulating layer 18, and a portion of the first conductive strip (including the conductive sheet 14, the first connecting line 15, the conductive sheet 16) and the insulating surface layer 19. The conductive strips 14, 15 of the first conductive strip and the second connecting line 12 of the second conductive strip are coplanar, and the first connecting line 15 is framed The bridge spans the second connecting line 12, wherein the first connecting line 15 and the second connecting line 12 are separated by an insulating layer 18. Other bridging methods can be inferred by those skilled in the art and will not be described herein. For example, with respect to the upward bridging method of the present example, it may be a downward bridging method.

A guarding or shielding conductive strip may be added between the first conductive strip and the second conductive strip, and the shielding conductive strip may increase the amount of change of the detected mutual electrical coupling signal, and may also reduce the amount of the external conductive object from the external conductive object. The noise and the negative touch caused by the external conductive object flowing from the capacitive touch panel to the external conductive object and flowing into the capacitive touch panel. The shielding conductive strip shields the first conductive strip from the second conductive when the shielding conductive strip is interposed between the first conductive strip and the second conductive strip, and the shielding conductive strip is provided with a DC potential or coupled to the ground of the system The direct capacitive coupling between the strips increases the amount of variation in the inter-electrical coupling signal that can be affected by external conductive objects coupled to ground.

For example, as shown in FIG. 2A and FIG. 2B, which is a schematic diagram of a capacitive sensor with a shielded conductive strip, the shielded conductive strip 21 is alternately arranged with the first conductive strip 23 and exposed to each other, and the first conductive strip 23 has a plurality of openings. 24 causes the conductive sheets 25 of the second conductive strip 22 to be exposed to the first conductive strips 22.

Referring to FIG. 2C, when performing two-dimensional mutual capacitance detection, an AC driving signal (for example, a pulse width modulation signal PWM) is sequentially supplied to each of the first conductive strips 23, and via the second conductive The signal S of the strip 22 obtains one-dimensional sensing information corresponding to each of the conductive strips to which the driving signal is supplied, and the sensing information corresponding to all the first conductive strips 23 constitutes a two-dimensional sensing information. The one-dimensional sensing information may be generated according to the signal of the second conductive strip 22, or may be generated according to the difference between the signal of the second conductive strip 22 and the reference. In addition, the sensing information may be based on the current, voltage, and capacitive coupling of the signal, The amount of charge or other electronic properties are produced and may be in the form of analogies or digits. In this example, the drive signal is provided to one of the first conductive strips 23 in turn, and those skilled in the art will infer that the drive signals are alternately provided to adjacent ones of the first conductive strips 23 Article or more.

For example, in an example of the present invention, a driving signal is provided in turn in one of the first conductive strips, and when each of the first conductive strips is provided with a driving signal. Detecting signals of all the second conductive strips to obtain one-dimensional sensing information corresponding to the first conductive strips to which the driving signals are supplied according to the signals of all the second conductive strips, each of the sets corresponding to the supplied driving signal One-dimensional sensing information of a conductive strip to generate a two-dimensional sensing information. In another example of the present invention, a pair of driving signals are provided in a pair of the first conductive strips, and each of the first conductive strips is simultaneously provided with a driving signal. Detecting signals of all the second conductive strips to obtain one-dimensional sensing information corresponding to the first conductive strips of the supplied driving signals according to the signals of all the second conductive strips, each set corresponding to the supplied driving signal The one-dimensional sensing information of the first conductive strips generates a two-dimensional sensing information.

Those skilled in the art having ordinary knowledge can infer that the position of each of the external conductive objects coupled to the ground is determined based on the two-dimensional sensing information. For example, the watershed algorithm, the connected object method or other image segmentation method is used to determine the range of proximity or touch of each external conductive object coupled to the ground, and further determine the position. For example, the centroid position is calculated from the signal value of the range of proximity or touch of the external conductive object. When there is actually no external conductive object approaching or covering the touch panel, or the system does not determine that the external conductive object approaches or covers the touch panel, the position detecting device may be The signal of the second conductive strip produces a reference. The sensing information may be generated according to the signal of the second conductive strip or by subtracting the reference according to the signal of the second conductive strip. In the former, the difference between the sensing information and the reference can be used to determine the positive touch and/or the negative touch, and the latter is a preferred example of the present invention. The sensing information itself has a difference from the reference, which can be directly used for judging Positive and/or negative touch. The reference may be taken at an initial stage of the position detecting device and/or repeatedly during the operational phase of the position detecting device.

In the following description, when the external conductive object approaches or covers the touch panel, a positive touch is caused, and a portion corresponding to the positive touch in the sensing information is regarded as positive touch sensing information. Conversely, the portion of the sensing information that exhibits the opposite characteristic to the positive touch sensing information is collectively referred to as negative touch sensing information, indicating a negative touch. The formation of the positive touch sensing information is not necessarily caused by the proximity or covering of the touch panel by the external conductive object, and the proximity or covering of the touch panel by the external conductive object is only one of the reasons for forming a positive touch. The sensing information includes, but is not limited to, one-dimensional sensing information or two-dimensional sensing information. In addition, the formation of a negative contact does not necessarily have an external conductive object or any substance located at a corresponding location. Moreover, the positive touch sensing information may be the matching or similar sensing information corresponding to the positive touch, and is not necessarily caused by the actual external conductive object approaching or covering the touch panel. For example, when the one-dimensional sensing information presents the signal value of the conductive strip, the positive touch sensing information may be a positive value of increasing or decreasing, or a negative value of decreasing and increasing, and the negative touch sensing information and the positive touch sensing information. in contrast. For another example, when the one-dimensional sensing information presents a difference between the conductive strip and the other conductive strip, the positive touch sensing information may be a positive value of increasing and decreasing, plus a negative value of decreasing and increasing, that is, a positive value. Negative value, and negative touch sensing information is opposite to positive touch sensing information.

When a conductive material is adhered to the insulating surface layer, such as water, the sensing information may vary due to the size of the area where the conductive material adheres. When the area where the conductive material adheres is small, The capacitive coupling between the conductive material and the conductive strip may present negative touch sensing information. However, when the area where the conductive material adheres is large, the capacitive coupling between the conductive material and the conductive strip may present positive touch sensing information in addition to the negative touch sensing information. When water is distributed in many areas, many positive touch sensing information and negative touch sensing information may be presented, resulting in misjudgment.

If only the negative touch sensing information is present in the sensing information, and there is no positive touch sensing information, it can be determined that the insulating surface is adhered with the conductive material. In addition, if there is negative touch sensing information in the sensing information, and there is positive touch sensing information at the edge of the negative touch sensing information, it may be determined that the insulating surface is contaminated with the conductive material. When it is determined that the insulating surface is contaminated with a conductive substance, the system or the user may be prompted to adhere the conductive material to the insulating surface and wait for further disposal. For example, it may be an update of the pause reference or no location of any detected external conductive objects until the adhesion of the conductive material is excluded. However, the above situation is limited to the adhesion of conductive substances to a small area.

In addition, the present invention provides a one-way mutual capacitive detection with full screen driven, hereinafter referred to as full screen driven detection. Referring to FIG. 2D, in a preferred embodiment of the present invention, the position detecting device must have the capability of simultaneously providing a driving signal to all of the first conductive strips. Hereinafter, the driving signal (for example, the pulse width modulation signal PWM) is simultaneously provided. All of the first conductive strips are driven in full screen. At each full screen drive, at least one dimensional sensing information is generated based on the signals of all or a portion of the conductive strips. As mentioned previously, full-screen drive one-dimensional mutual capacitance detection also has its reference. In addition, when the touch panel has the shielding conductive strip 21, the full-screen driving further includes simultaneously providing a driving signal to all of the shielding conductive strips 21, that is, simultaneously providing driving signals to all of the first conductive strips 23 and the shielding conductive strips 21. In the following description, in the full-screen drive detection, simultaneously providing the driving signal to all of the first conductive strips 23 also means providing the driving signals to all at the same time. Shielding conductive strips 21. If the touch panel only has the first conductive strip 23 and the second conductive strip 22, and the shielded conductive strip is not present, the full screen drive only includes simultaneously providing a driving signal to all of the first conductive strips.

If only a drive signal is provided to a single conductive strip, the drive signal may be capacitively coupled to other conductive strips via the adhered conductive material to cause a negative or positive contact. When all of the first conductive strips of the full screen are supplied with the driving signal, the potential of each of the first conductive strips is the same, and the above problem will not occur.

In addition, when all the first conductive strips of the full screen are provided with driving signals, the proximity or coverage of the external conductive objects may present positive touch sensing information, thereby determining whether there is proximity or coverage of the external conductive objects, and external conductive objects. A one-dimensional coordinate of the proximity or coverage of the conductive strips and/or external conductive objects.

For example, a driving signal is simultaneously provided to all of the first conductive strips, and when the first conductive strips are simultaneously supplied with a driving signal, signals of all the second conductive strips are detected to obtain signals of all the second conductive strips. One-dimensional sensing information. When each value of the one-dimensional sensing information is a signal for presenting one of the second conductive strips, it may be determined by using a threshold value whether at least one value exceeding the threshold value exists in the one-dimensional sensing information. When at least one value exceeds the threshold value, it indicates that at least one external conductive object coupled to the ground approaches or touches the touch panel.

In an example of the present invention, the touch panel has the aforementioned shielding conductive strip. When performing full-screen drive detection, the drive signal is simultaneously supplied to the shielded conductive strip and the first conductive strip. When performing two-dimensional mutual capacitance detection, when the driving signal is supplied, the shielding conductive strip is simultaneously supplied with a direct current potential or coupled to the ground of the system.

For example, a touch panel detection device according to the present invention includes: a touch panel including a plurality of first conductive strips, a plurality of second conductive strips, and a plurality of shielded conductive strips, wherein The first conductive strip, the second conductive strip and the shielding conductive strip are mutually exposed; a controller, the controller performs a full-screen driving detection, comprising: simultaneously providing a driving signal to all the first conductive strips and all the shielding conductive strips; Simultaneously providing a driving signal to all the first conductive strips and all the shielding conductive strips, detecting the mutual capacitive coupling signals of all the second conductive strips to obtain a one-dimensional sensing according to the signals of all the second conductive strips And determining, according to the one-dimensional sensing information, whether at least one external conductive object coupled to the ground approaches or covers the touch panel; and the controller determines, according to the one-dimensional sensing information, that at least one external conductive object coupled to the ground is in proximity Or covering the touch panel, performing a two-dimensional mutual capacitance detection to obtain a two-dimensional sensing information, according to the two-dimensional sensing information a position of each of the external conductive objects coupled to the ground, wherein the two-dimensional mutual capacitive detection comprises: alternately providing a driving signal to the different one or more conductive strips in the first conductive strip, and providing all shielded conductive a strip current potential; detecting a signal of all the second strips to obtain a mutual basis according to all the second strips when each of the one or more strips in the first strip is provided with a driving signal The capacitively coupled signal generates one-dimensional sensed information corresponding to the first conductive strip to which the drive signal is provided; and a set of one-dimensional sensed information corresponding to the first conductive strip to which the drive signal is provided to generate a two-dimensional sense Measurement information.

In addition, the one-dimensional sensing information may also be generated in the form of a difference or a double difference. For example, when each value of the one-dimensional sensing information is a difference of the signals of the pair of the second conductive strips, it may be determined whether at least one of the one-dimensional sensing information is located adjacent to each other. a zero-crossing between a positive value and a negative value, when present to When there is one less zero crossing, it indicates that at least one external conductive object coupled to the ground approaches or touches the touch panel. Wherein, the adjacent one of the positive value and the adjacent one of the negative values means that there is no value or only zero value between the positive value and the negative value. Moreover, in an example of the invention, values falling within a predetermined range of zero values are considered to be zero values, wherein the range of zero values includes zero. Since the capacitive touch panel is susceptible to interference from external noise, the use of a zero value range reduces false positives and simplifies data. In an example of the present invention, it is assumed that the signals of the second conductive strip are sequentially S1, S2, . . . , Sn, and the one-dimensional sensing information is a difference, and the value of the one-dimensional sensing information is The order is S1-S2, S2-S3, ..., Sn-1-Sn.

When each value of the one-dimensional sensing information is a difference between the signal differences of the two pairs of second conductive strips in the second conductive strip, respectively, it may be determined by using a threshold value whether one-dimensional sensing information exists in excess At least one value of the threshold value, when at least one value exceeds the threshold value, indicates that at least one external conductive object coupled to the ground approaches or touches the touch panel. In addition, it may be determined whether there is at least one value exceeding the threshold value between the two zero-crossing intersections, and when there is at least one value exceeding the threshold value between the two zero-crossing intersections, at least one coupled to the ground The external conductive object approaches or touches the touch panel. In an example of the present invention, it is assumed that the signals of the second conductive strip are sequentially S1, S2, . . . , Sn, and the one-dimensional sensing information is a double difference value, and the value of one-dimensional sensing information is used. In order, they are ((S2-S3)-(S1-S2)), ((S3-S4)-(S2-S3)),...,((Sn-1-Sn)-(Sn-2- Sn-1)). In a preferred mode of the invention, the one-dimensional sensing information is a double difference.

In brief, in the foregoing example, it may be determined whether there is a value exceeding the threshold value or a zero intersection to determine whether at least one conductive object coupled to the ground contacts or touches the touch panel. Those skilled in the art having ordinary knowledge can infer that one-dimensional sensing resources The signal may also be in the form of a signal value, a difference value, or a double difference value. For example, each value is a difference of non-adjacent signal values, and the present invention is not limited thereto.

In a best mode of the present invention, the position detecting device must have the ability to simultaneously provide a drive signal to all of the first conductive strips and the ability to detect the second conductive strip. That is, while driving in full screen, one-dimensional sensing information is generated according to the signal of the second conductive strip. The detecting of the second conductive strip may be performed by scanning a plurality of strips at the same time and simultaneously scanning all the second conductive strips to obtain sensing information of all the second conductive strips, which is referred to as full-screen driving detection in the following description. . In other words, full-screen drive detection includes detecting mutual capacitive coupling signals of all detected conductive strips (eg, all second conductive strips) while driving all of the driven conductive strips (eg, all of the first conductive strips).

When sufficient resolution is satisfied, as the size of the touch panel increases, the number of conductive strips also increases. However, the controller can simultaneously detect the position of the conductive strips without necessarily increasing. In the two-dimensional mutual capacitance detection, it is only required to be detected by a single axial conductive strip, such as the aforementioned second conductive strip. Therefore, the position detecting device can directly use the original detection structure of the second conductive strip to perform full-screen driving detection as long as the capability of full-screen driving is increased. In a preferred embodiment of the invention, the number of second conductive strips is less than the number of first conductive strips.

In another example of the present invention, the position detecting device must have the ability to simultaneously provide a drive signal to all of the first conductive strips and the ability to detect all of the conductive strips. That is, while driving in the full screen, the first one-dimensional sensing information is generated according to the signal of the first conductive strip, and the second one-dimensional sensing information is generated according to the signal of the second conductive strip. Compared with the previous example, the position detecting device must also have the ability to detect the first conductive strip.

In summary, in the case of full-screen drive detection, if there is no proximity of external conductive objects Or covering, whether or not there is adhesion of conductive substances, will not judge the positive touch, that is, the sensing information will not present the positive touch sensing information. In an example of the present invention, it is determined by full-screen driving detection whether there is a positive touch or whether there is proximity or coverage of an external conductive object. In another example of the present invention, the conductive strip that is approached or covered by the external conductive object is determined by full-screen driving detection, and may be only the second conductive strip covered, or may be the covered first conductive strip and The second conductive strip. In another example of the present invention, the coordinate is detected by the full-screen driving, and the one-dimensional coordinate is determined by the single-dimensional sensing information, or the first one-dimensional sensing information and the second dimension are The sensing information respectively determines the coordinates of the first dimension and the coordinates of the second dimension, that is, the two-dimensional coordinates.

The foregoing position detecting device can be capable of full-screen driving detection and two-dimensional mutual capacitance detection. For example, the driving signal may be provided to all, a plurality of or one first conductive strip at the same time, and one-dimensional sensing information or two-dimensional sensing information is detected by the second conductive strip.

Please refer to FIG. 2E , which is a schematic flowchart of performing full-screen drive detection and then performing two-dimensional mutual capacitance detection according to the first embodiment of the present invention. As shown in step 210, full screen drive detection is performed to generate one-dimensional sensing information. Next, as shown in step 220, it is determined whether to perform two-dimensional mutual capacitance detection according to the one-dimensional sensing information. For example, if the one-dimensional sensing information determines that the external conductive object is close to or covered, then as shown in step 230, two-dimensional mutual capacitance detection is performed to generate two-dimensional sensing information, and as shown in step 240, The position of the external conductive object is judged according to the two-dimensional sensing information.

In step 220, if the proximity or coverage of the external conductive object is not determined, then return to step 210 to perform full-screen drive detection again. In an example of the present invention, full screen is performed The period of the drive detection is fixed, that is, during a period of continuous full-screen drive detection, the interval between the two adjacent full-screen drive detections is a detection period. In any detection cycle, if the proximity or coverage of the external conductive object is not determined, only one power of the full-screen drive detection is consumed, and vice versa, the power for performing a full-screen drive detection is required to perform N times of one-dimensional mutual interaction. Capacitive detection (ie, two-dimensional mutual capacitance detection) of electricity. The detection period can be adjusted according to requirements. For example, in the power saving mode, the detection period can be extended to save power, and in the normal mode, the detection period can be shortened to improve the detection frequency. That is to increase the rate of the report (coordinate). In contrast, in another example of the present invention, the detection period may be unfixed. For example, in step 220, it is determined that there is no proximity or coverage of the external conductive object, and step 210 is performed again. For example, in normal mode, full-screen drive detection is repeated, unless two-dimensional full-capacity detection is required. If it is necessary to perform two-dimensional full-capacity detection, after step 230 or after steps 230 and 240, step 210 is performed again.

In addition, the full-screen drive detection is performed according to a first detection frequency. After a preset time or number of times, there is no proximity or coverage of the external conductive object, and then the full-screen drive detection is performed according to a second detection frequency. Until the proximity or coverage of the external conductive object is detected, the full-screen drive detection is performed according to the first detection frequency. For example, the driving signal is supplied to all of the first conductive strips at a first frequency, and the first conductive strips are supplied to the first conductive strips at the first frequency for a predetermined time or number of times without determining that there is an external conductive coupled to the ground. When the object approaches or covers the touch panel, the driving signal is supplied to all of the first conductive strips at a second frequency, wherein the first frequency is faster than the second frequency. In addition, when the driving signal is changed to a second frequency and is supplied to all the first conductive strips, it is determined that when an external conductive object coupled to the ground approaches or covers the touch panel, the driving signal is supplied to the first conductive at the first frequency. article.

In addition, after two-dimensional mutual capacitance detection is performed to determine the proximity or coverage of the external conductive object, the two-dimensional mutual capacitance detection is continued, and steps 210 and 220 are skipped, and full-screen drive detection is not performed. Until the two-dimensional mutual capacitance detection does not determine the proximity or coverage of the external conductive object.

Accordingly, in an example of the present invention, when a driving signal is simultaneously provided to all the first conductive strips, the mutual capacitive coupling signals of all the second conductive strips are detected to obtain signals according to all the second conductive strips. Generating one-dimensional sensing information, and determining whether there is at least one external conductive object coupled to the ground approaching or covering the touch panel to determine whether to perform a two-dimensional mutual capacitance detection according to the one-dimensional sensing information, wherein the two-dimensional mutual mutual detection The capacitive detection detects the mutual capacitive coupling signals of all the second conductive strips when a portion of the first conductive strips of the first conductive strip are supplied with a driving signal.

Please refer to FIG. 3 , which is a flow chart of determining a position according to a result of full-screen driving detection and two-dimensional mutual capacitance detection according to a second embodiment of the present invention. As shown in step 310, full screen drive detection is performed to generate one or two one-dimensional sensing information. For example, generating a one-dimensional sensing information according to the signal of the first conductive strip or the second conductive strip, or corresponding to the signal of the first conductive strip and the second conductive strip The first one-dimensional sensing information of the first conductive strip and the second one-dimensional sensing information corresponding to the second conductive strip. Next, as shown in step 320, it is determined whether there is proximity or coverage of at least one external conductive object according to the one-dimensional sensing information. If there is no proximity or coverage of the at least one external conductive object, proceed to step 310, otherwise, as shown in step 330, determine the conductive strip that is approached or covered by the external conductive object according to the one-dimensional sensing information, and as steps As shown at 340, at least one mutual capacitance is determined according to a conductive strip that is approached or covered by the external conductive object. Range of detection. Next, as shown in step 350, mutual capacitance detection is performed on the mutual capacitance detection range, and a two-dimensional sensing is generated according to the mutual capacitive coupling of all the overlapping portions in the mutual electric detection range. News. For example, the capacitive coupling of the overlapping touches outside the mutual capacitance detection range is specified as a preset value (eg, a zero value), and is detected by capacitive coupling according to the mutual capacitance detection range. The resulting value produces a two-dimensional sensing information. Next, as shown in step 360, the position of each of the external conductive objects is determined based on the two-dimensional sensing information. After that, proceed to step 310. The aforementioned two-dimensional sensing information may also be an incomplete full-screen image, and only exhibits capacitive coupling within the mutual capacitance detection range, thereby determining the position of each external conductive object.

In an example of the present invention, one-dimensional sensing information is generated according to the signal of the first conductive strip, and the mutual capacitive detection range is all overlapping of the first conductive strips that are approached or covered by the external conductive object. At the office. In other words, the driving signals are provided one by one to the first conductive strips that are approached or covered by the external conductive objects, and when each of the first conductive strips is supplied with the driving signal, the two-dimensional sensing information is generated according to the signals of all the second conductive strips. . The advantages of this example save a lot of time compared to two-dimensional full-capacity detection.

In another example of the present invention, the one-dimensional sensing information is generated according to the signal of the second conductive strip, and the mutual capacitive detection range is all intersections of the second conductive strip that is approached or covered by the external conductive object. Stacked. In other words, the driving signals are supplied to the first conductive strips one by one, and when each of the first conductive strips is supplied with the driving signal, the two-dimensional sensing is generated according to the signal of the second conductive strip that is approached or covered by the external conductive object. News. Compared with the two-dimensional full-capacity detection, this example can ignore the noise outside the mutual capacitance detection range.

In a preferred embodiment of the present invention, the first conductive strip and the The signal of the second conductive strip generates the first one-dimensional sensing information and the second one-dimensional sensing information, and the mutual capacitive detecting range is between the first conductive strip and the second conductive strip that is close to or covered by the external conductive object. All overlaps. In other words, the driving signals are supplied one by one to the first conductive strips that are approached or covered by the external conductive objects, and the signals of the second conductive strips that are approached or covered by the external conductive objects are provided when each of the first conductive strips is supplied with a driving signal. Generate two-dimensional sensing information. Compared with two-dimensional full-capacity detection, the advantages of this example can save a lot of time and neglect the noise outside the mutual capacitance detection range.

In addition, in an example of the present invention, it may be determined that, according to the first one-dimensional sensing information, the presence of at least one external conductive object coupled to the ground approaches or covers the touch panel, including: sensing information according to the first dimension. Determining a first dimension coordinate of each of the external conductive objects coupled to the ground; detecting signals of all the second conductive strips to obtain a second one-dimensional sensing information according to signals of all the second conductive strips; The first-dimensional sensing information determines a second-dimensional coordinate of each of the external conductive objects coupled to the ground; respectively, each of the first-dimensional coordinates respectively corresponds to a two-dimensional coordinate formed by each of the second-dimensional coordinates; respectively Intersecting the intersection of the first conductive strip and the second conductive strip closest to each two-dimensional coordinate as a corresponding overlap; and respectively performing the detected overlapping of each two-dimensional coordinate Capacitive detection detects a mutual capacitive coupling signal at the corresponding overlap of each two-dimensional coordinate to determine one of each external conductive object coupled to the ground Dimensional coordinates.

The mutual capacitive detection for any detected overlap may be to provide a drive signal to at least one first conductive strip including a first conductive strip overlapping the detected overlap, and to detect A signal comprising a second conductive strip that overlaps the detected overlap is detected to detect a mutual capacitive coupling signal at each overlap. Where the overlap on the same first conductive strip is The signal is simultaneously detected while the driving signal is supplied to the at least one first conductive strip including the first conductive strip overlapping the detected overlap. Wherein, the signal of the two-dimensional coordinate of the external conductive object coupled to the ground exceeds a threshold value.

In another example of the present invention, determining, according to the first one-dimensional sensing information and/or the second one-dimensional sensing information, that at least one external conductive object coupled to the ground approaches or covers the touch panel, including: The one-dimensional sensing information or the mutual-capacitive detection range is determined according to the first-dimensional sensing information and the second-dimensional sensing information; and the mutual-capacitive detection range of the mutual-capacitive detection range is performed according to The mutual capacitive coupling signal at the intersection of all the first conductive strips and the second conductive strips in the mutual capacitance detection range generates a two-dimensional sensing information; and each of the two sensing information is determined according to the two-dimensional sensing information. The location of the external conductive object coupled to ground.

The mutual capacitance detection range may be based on the first one-dimensional sensing information or determining, according to the first one-dimensional sensing information and the second one-dimensional sensing information, that the external conductive object is coupled to the first conductive object. The intersection of all the first conductive strips on the first conductive strip and the second conductive strip or at the intersection of all the first conductive strips and the second conductive strips that are coupled to or touched by the first outer conductive object Decide. Please refer to FIG. 4A , which is a flow chart of determining a position according to a result of full-screen driving detection and mutual capacitance detection according to a third embodiment of the present invention. As shown in step 410, full-screen drive detection is performed to generate a one-dimensional sensing information. Next, as shown in step 420, it is determined whether there is proximity or coverage of at least one external conductive object according to the one-dimensional sensing information. If there is no proximity or coverage of the at least one external conductive object, proceed to step 410. Otherwise, as shown in step 430, at least a first one-dimensional coordinate is determined according to the one-dimensional sensing information. Then, according to step 440, at least one first mutual capacitance detection range is determined according to the at least one conductive strip corresponding to the one-dimensional coordinate, and according to step 450 The first mutual capacitance detection range is mutually capacitively detected to determine at least one second one-dimensional coordinate corresponding to each of the first one-dimensional coordinates. For example, two first one-dimensional coordinates are determined in step 430, and two mutual capacitance detection ranges are determined in step 440 by two conductive strips that are closest to the two first one-dimensional coordinates, and step 450 Performing an electrical cross-detection to generate one-dimensional sensing information corresponding to each of the first one-dimensional coordinates, and further determining at least one second-dimensional coordinate corresponding to each of the first one-dimensional coordinates. The first one-dimensional coordinate and the second one-dimensional coordinate may constitute a two-dimensional coordinate, such as (first first-dimensional coordinate, second-dimensional coordinate) or (second-dimensional coordinate, first-dimensional coordinate).

For example, when the first conductive strip is simultaneously provided with the driving signal, the signals of all the second conductive strips are detected to obtain a first one-dimensional sensing information according to the signals of all the second conductive strips. In addition, determining, according to the one-dimensional sensing information, that the external conductive object coupled to the ground approaches or covers the touch panel further includes: determining at least one first-dimensional coordinate according to the first-dimensional sensing information; The one-dimensional coordinate determines a first mutual capacitance detection range, and performs mutual capacitance detection on the first mutual capacitance detection range to generate a second corresponding to each first one-dimensional coordinate One-dimensional sensing information; generating at least one second-dimensional coordinate corresponding to each first-dimensional coordinate according to a second one-dimensional sensing information corresponding to each first-dimensional coordinate; and respectively according to each The first dimension coordinate and the corresponding second dimension coordinate each generate a two-dimensional coordinate.

Referring to FIG. 4B, the method further includes the step 460, determining at least one second mutual capacitance detection range according to the second one-dimensional coordinate, and including the step 470, the second mutual capacitance The detection range performs mutual capacitance detection to respectively determine a third dimension coordinate corresponding to each second dimension coordinate. The second dimension coordinate and the The three-dimensional coordinate coordinates may constitute a two-dimensional coordinate, such as (third-dimensional coordinate, second-dimensional coordinate) or (second-dimensional coordinate, third-dimensional coordinate).

For example, when the first conductive strip is simultaneously provided with the driving signal, the signals of all the second conductive strips are detected to obtain a first one-dimensional sensing information according to the signals of all the second conductive strips. In addition, when it is determined that the external conductive object coupled to the ground approaches or covers the touch panel according to the one-dimensional sensing information, the method further includes: determining, according to the first dimension sensing information, at least one first dimension coordinate; Each of the first one-dimensional coordinates determines a first mutual capacitance detection range, and the first mutual capacitance detection range is mutually capacitively detected to generate a first one-dimensional coordinate corresponding to each a second one-dimensional sensing information; generating at least one second-dimensional coordinate corresponding to each first-dimensional coordinate according to a second one-dimensional sensing information corresponding to each first-dimensional coordinate; respectively Each of the second dimension coordinates determines a second mutual capacitance detection range, and the second mutual capacitance detection range is mutually capacitively detected to generate a coordinate corresponding to each of the second one dimensional coordinates. a third one-dimensional sensing information; generating at least one corresponding to each of the second one-dimensional coordinates according to the third one-dimensional sensing information corresponding to each of the second one-dimensional coordinates A dimension coordinate; and generate a second dimension based on each of the corresponding coordinates and a third dimension coordinate of each dimension twelve coordinates.

In FIG. 4A, each of the first one-dimensional coordinate pairs corresponds to each of the second one-dimensional coordinates representing the position of one of the outer conductive objects. In addition, step 410 is continued after the external conductive object is judged. In FIG. 4B, each of the third one-dimensional coordinates corresponding to each of the second one-dimensional coordinates represents the position of one of the outer conductive objects. In addition, step 410 is continued after the external conductive object is judged.

Please refer to FIG. 4C , which is a flow chart of determining a position according to the result of full-screen driving detection and mutual capacitance detection according to the third embodiment of the present invention. As shown in step 410, full-screen drive detection is performed to generate two one-dimensional sensing information. Next, as shown in step 420, it is determined whether there is proximity or coverage of at least one external conductive object according to the one-dimensional sensing information. If there is no proximity or coverage of the at least one external conductive object, proceed to step 410, otherwise, as shown in step 480, all possible two-dimensional coordinates are determined according to the one-dimensional sensing information, and according to the The two-dimensional coordinate determines at least one mutual capacitance detection range, and as shown in step 490, the two-dimensional coordinate corresponding to the positive touch is determined according to the mutual capacitance detection range.

Obviously, by using the above-mentioned full-screen driving detection, whether or not there is water stain or other conductive object on the touch panel that is not coupled to the external ground, it can be determined whether there is an external conductive object that is coupled to the external ground to approach or cover. . Further, when it is determined that the external conductive object with the ground outside the coupling is close to or covered, the two-dimensional mutual capacitance detection can determine that the external conductive object outside the coupling is close to or outside the touch range. The range of water stains or other conductive objects that are coupled to the ground outside. When judging the range of water stains or other conductive objects that are not coupled to the outside, it is possible to provide any coordinates detected by water stains or other conductive objects in the ground that are not coupled to the outside, or to display cleaning. Information or signals on the surface of the touch panel to indicate interference with water or other conductive objects that are not coupled to the outside.

In another example of the present invention, the two-dimensional mutual capacitance detection is performed first and then the full-screen drive detection is performed. The full-screen drive detection can determine that the conductive strips of the external conductive objects that are coupled to the external ground are close to or covered, and are compared with the two-dimensional sensing information generated by the two-dimensional mutual capacitance detection, and can detect the external part of the ground coupled to the outside. Uncoupling of conductive strips that are close to or covered by conductive objects Water stains or other conductive objects on the outside of the ground.

As the system operates, the impact and interference of the external environment on the touch panel has been changing. In order to adapt to such changes, it can be overcome by periodically or irregularly updating the benchmark. Therefore, the update of the reference may be continuous, and may be in the process of full screen drive detection and/or mutual capacitance detection.

In the case of mutual capacitance detection, if a conductive substance is attached to the touch panel, a corresponding negative touch or a negative touch with a positive touch will be presented in the two-dimensional sensing information, and if the reference is updated, the reference will be Including the negative touches described. Prior to the next baseline update, the position of the external conductive object can be detected normally as long as the external conductive object is not in the area of the negative touch. However, if the conductive material is wiped off, the area of the original reference that exhibits a negative touch will present a positive touch on the two-dimensional sensing information, causing a judgment error.

By comparing the one-dimensional sensing information generated by the full-screen driving detection described above, if there is a corresponding positive contact between the two-dimensional sensing information and the one-dimensional sensing information, the above problem may be reflected, so the mutual capacitance is performed. The benchmark update of the detection detects the above problem. For example, one-dimensional sensing information may be generated by one-dimensional projection of the two-dimensional sensing information, or one-dimensional sensing information may be generated by summing the values corresponding to the overlaps on each of the second conductive strips. The one-dimensional sensing information derived from the two-dimensional sensing information can be used to compare with the one-dimensional sensing information generated by the full-screen driving detection to determine whether there is a corresponding non-corresponding positive touch to determine whether to perform mutual capacitance in advance. Benchmark update for detection.

In addition, it is also possible to determine whether or not a conductive substance is attached to the touch panel by only two-dimensional full-capacity detection. For example, in the two-dimensional sensing information, only the negative touch is presented without presenting the positive touch, or the positive touch only appears around the negative touch without the positive touch exceeding the threshold value. This judges that the touch panel may have a conductive substance adhered thereto. In an example of the present invention, it may be directly estimated that the conductive material is adhered to the touch panel. In another example of the present invention, full screen drive detection is additionally performed in this case to confirm whether there is proximity or coverage of the external conductive object.

In an example of the present invention, the reference is updated when no external conductive object approaches or covers the touch panel. For example, as described above, the full-screen driving detection first determines whether an external conductive object approaches or covers the touch panel, and the reference update is performed when no external conductive object approaches or covers the touch panel, which may include full-screen driving detection or Benchmark update with mutual capacitance detection. For example, the two-dimensional sensing information generated by the two-dimensional full-compatibility detection determines whether an external conductive object approaches or covers the touch panel, and updates the reference when no external conductive object approaches or covers the touch panel. .

Referring to FIG. 5A, it is a schematic flowchart of an update reference according to a fourth embodiment of the present invention. Compared with FIG. 2E , the method further includes, as shown in step 250 , determining whether the at least one external conductive object coupled to the ground approaches or covers the touch panel according to the one-dimensional sensing information. If there is no at least one external conductive object coupled to the ground to approach or cover the touch panel for more than a preset time, then as shown in step 210, full-screen drive detection is continued. On the other hand, if it is determined according to the one-dimensional sensing information that there is no at least one external conductive object coupled to the ground to approach or cover the touch panel for a predetermined period of time, then as shown in steps 260 and 270, performing a two-dimensional mutual capacitance Detection to obtain a two-dimensional sensing information to update a reference based on the two-dimensional sensing information. The step of updating the reference of FIG. 5A may be performed by the aforementioned controller 160. In an example of the present invention, updating a reference according to the two-dimensional sensing information is to use the two-dimensional sensing information as a new reference or to sense the information in two dimensions. The benchmark average is used as the new benchmark. In addition, the position of each of the external conductive objects coupled to the ground is determined based on the amount of change between the two-dimensional sensing information and the reference mutual capacitive coupling signal.

For example, a touch panel detection device according to the present invention includes: a touch panel including a plurality of first conductive strips and a plurality of second conductive strips; and a controller that executes a full screen The driving detection includes: simultaneously providing a driving signal to all the first conductive strips; and simultaneously providing a driving signal to all the first conductive strips, detecting mutual capacitive coupling signals of all the second conductive strips to obtain a basis The signals of all the second conductive strips generate one-dimensional sensing information; and determine whether there is at least one external conductive object coupled to the ground to approach or cover the touch panel according to the one-dimensional sensing information; and sense the sensor according to one dimension The information is determined to be continuous for a predetermined period of time when at least one external conductive object coupled to the ground approaches or covers the touch panel, and performs a two-dimensional mutual capacitance detection to obtain a two-dimensional sensing information according to the two-dimensional sense The measurement information updates a reference, wherein the two-dimensional mutual capacitance detection comprises: providing a driving signal in a different one of the first conductive strips in turn a plurality of conductive strips; each time a different one or more conductive strips in the first conductive strip are provided with a driving signal, detecting signals of all the second conductive strips to obtain mutual mutual interference according to all the second conductive strips The capacitively coupled signal generates one-dimensional sensed information corresponding to the first conductive strip to which the drive signal is provided; and a set of one-dimensional sensed information corresponding to the first conductive strip to which the drive signal is provided to generate a two-dimensional sense Measurement information.

Performing a two-dimensional mutual capacitance detection to obtain a two-dimensional sensing information according to the one-dimensional sensing information to determine that at least one external conductive object coupled to the ground approaches or touches the touch panel, according to the two-dimensional sense The measurement information determines the position of each of the external conductive objects coupled to the ground.

When the touch panel device is in the handheld device, it is possible that the hand holding the handheld device is approaching or covering the touch panel when the device is turned on. If the baseline update is performed at this time, the initial reference obtained will contain the positive touch sensing information, so that the location of the positive touch sensing information in the reference cannot reflect the proximity or coverage of the external conductive object, even if the reference touch sensing information is later caused. The removal of the touch panel by the finger or the palm may still cause the portion to fail to respond to the proximity or coverage of the external conductive object, for example, the position of the external conductive object that approaches or covers the portion cannot be normally judged.

Referring to FIG. 5B, it is a schematic flowchart of an update reference according to a fifth embodiment of the present invention. The present invention proposes to store an original reference in advance, and the original reference may be stored in a non-volatile storage unit, so that it does not disappear even if it is turned off. First, as shown in steps 510 and 520, the obtained reference IS will be compared with the original reference DS. If it matches, the normal job (operation) is executed as shown in step 530, otherwise, as shown in step 540, the original is compared. Whether the reference and the obtained sensing information (one-dimensional sensing information or two-dimensional sensing information) match, if not, then perform a normal job (operation) as shown in step 560, otherwise, as shown in step 550, update Benchmark.

Under normal circumstances, the reference is updated when there is no external conductive object approaching or covering the touch panel or no conductive material is attached to the touch panel, so the normal reference (including the original reference DS) should not show a positive touch. Or negative touch. It is assumed that the original reference DS is normal, and the external conductive object approaches or covers when the reference IS is updated. When the sensing information RS is obtained, the original reference DS is compared with the reference IS, and the matching will not be performed at this time. Therefore, the sensing information RS and the reference DS are compared. If the two match, it means that no external conductive object has approached or covered the touch panel or no conductive material is attached to the touch panel, and the reference IS update can be performed immediately. If the two do not match, the reference IS cannot be updated and the normal operation can only be continued. For example, when the phone is turned on, the hand is pressed against the touch surface. The board not only presents the positive touch, but the sensing information RS also shows the positive touch. The two are the same, so even if the hand presses the touch panel, it will not judge that the external conductive object is close or touched, and then ignores The presence of the pressed part of the hand when the device is turned on, but the rest of the touch panel still functions normally. Once the hand is continuously pressed against the touch panel, the other parts are not close to or covered by the external conductive object. In step 540, it is determined that the sensing information RS matches the original reference DS, and the reference can be made. Update. If, in step 540, the other portion still has access or coverage of the external conductive object, normal operation continues until the reference IS is updated without the proximity or coverage of the external conductive object. In addition, if the original reference DS is not normal, the sensing information RS will not match the original reference DS, and the normal operation can still be continued as shown in step 560.

The above benchmarks can be applied to self-capacitance detection, mutual capacitance detection or full-screen drive detection.

In addition, the baseline update can be either a full baseline update or a partial baseline update. As described above, self-capacitance detection and full-screen drive detection generate one-dimensional sensing information. When this is used as a reference, the update of the reference is all updated. In the mutual capacitance detection, the two-dimensional sensing information is formed by a set of one-dimensional sensing information corresponding to each of the first conductive strips (the first conductive strips to which the driving signals are provided), so the reference update may be only A corresponding partial reference update is performed for a single first conductive strip, that is, only one of the plurality of one-dimensional sensing information in the reference is updated.

The touch panel of the present invention can be used for transmitting information and receiving information, that is, the touch panel can be used for capacitive communication, and one or more of the driving signals are provided on the touch panel through the controller. Or all of the first conductive strips provide signal transmission and detect one, more or all of the second conductive strips through the controller, The signal is received so that the two touch panels can communicate in one direction or two directions.

In an example of the present invention, the touch panel may be in face-to-face communication, that is, the touch panel is capacitively communicated across the surface of the touch panel via an insulating surface. For example, the touch panels of two handheld devices are stacked face to face for capacitive communication. In another example of the present invention, the touch panel may be capacitively communicated through the human body. For example, the user touches the touch panel of one handheld device with one hand, and touches the touch panel of the other handheld device with the other hand, and performs capacitive communication with the human body as a conductive medium. For example, the first user and the second user respectively touch the touch panel of the first handheld device and the touch panel of the second handheld device, and when the first hand user is in contact with the second user, The first handheld device performs capacitive communication with the touch panel of the second handheld device. Those skilled in the art can deduce that capacitive communication is not limited to one-to-one communication, but also can perform many-to-many communication, and is not present in the human body as a conductive medium, but also other conductive media. . For example, the two touch panels may be placed in different pockets of two people respectively, and when the two people shake hands or touch, the two touch panels can communicate.

Accordingly, the present invention provides a communication method for a touch panel, in which a first touch panel communicates with a second touch panel. The first touch panel and the second touch panel have a detection mode for detecting proximity or touch of the external conductive object. In addition, the first touch panel and the second touch panel have a communication mode via capacitive coupling communication between the first touch panel and the second touch panel to exchange or transmit a message. Therefore, a communication system is formed by the first touch panel and the second touch panel. In an example of the present invention, the detection mode and the communication mode may be alternately performed. In another example of the present invention, switching between a detection mode and a communication mode may be performed by a user interface.

Please refer to FIG. 6 , which is a schematic flowchart of a communication method of a touch panel according to a sixth embodiment of the present invention. As shown in step 610, a first touch panel and a second touch panel are provided. Next, as shown in steps 620 and 630, a detection mode of the first touch panel and the second touch panel respectively detect proximity or touch of the external conductive object, and the first touch panel and the second touch A communication mode of the control panel communicates via capacitive coupling between the first touch panel and the second touch panel to exchange or transmit a message.

For example, the first touch panel has a transparent insulating layer and a conductive layer, and the information is transmitted through the conductive layer via the transparent insulating layer and the second touch panel. In contrast, the second touch panel has a transparent insulating layer and a conductive layer, and the information is received by capacitively coupling the conductive layer to the first touch panel via the transparent insulating layer. The capacitive coupling between the first touch panel and the second touch panel may be that the first touch panel is capacitively coupled to the second touch panel through capacitive coupling with the at least one external conductive object. For example, the first touch panel and the second touch panel respectively have a plurality of first conductive strips that are provided with driving signals in the detecting mode and a plurality of second conductive strips that provide capacitive coupling signals by the driving signals, in the communication mode. The first touch panel and the second touch panel communicate with the first conductive strip and/or the second conductive strip that are close to or touched by the external conductive object. The transmission of the signal may be transmitted in an analog or digital manner. In a preferred example of the present invention, the signal is encoded in a digital manner, for example, a binary string or a packet, and the number of bits in a single transmission may be The fixed may also be variable. For example, it may be a fixed-length balanced code, a Berger Code, or a packet with a packet header. For example, the capacitive communication may be a handshake function as a touch of the transmission end. The panel transmits the transmission request by using the encoded signal or the packet. After receiving and confirming the transmission request, the touch panel as the receiving end responds with a signal or a packet to confirm the transmission, and the touch panel of the transmitting end can transmit the data to the receiving end. Those skilled in the art will be able to deduce other serial communication protocols.

When the two touch panels are close to or in contact with each other, a touch panel can confirm the existence of the other touch panel by providing a driving signal to the conductive strip and detecting the signal of the conductive strip, thereby performing capacitive communication. In an example of the present invention, the driving signal is provided by a first touch panel. If a second touch panel is in contact with the first touch panel or within a predetermined distance, the first touch panel is electrically conductive. The signal of the strip is relatively smaller than the signal of the conductive strip of the first touch panel when the second touch panel is not in contact or within a preset distance, thereby confirming whether capacitive communication is possible. At the same time, the conductive strip of the second touch panel is also capacitively coupled to the driving signal of the first touch panel, and the conductive strip of the second touch panel can also be notified to perform capacitive communication.

In an example of the invention, the controller performing the capacitive communication has the ability to identify the conductive strips that receive the signals. For example, when a first strip or a first group of conductive strips of the first touch panel is provided with a driving signal, a first strip or a first group of receiving strips of the second touch panel are capacitively coupled, and second When the controller of the touch panel detects the signals of the conductive strips, it can determine the conductive strips that are capacitively coupled. In this case, the second touch panel may select one or more conductive strips as a second strip or a second group of conductive strips and provide driving outside the first strip or the first group of receiving conductive strips. signal. Similarly, the first touch panel can detect a second strip or a second group of receiving strips that are capacitively coupled to the driving signals transmitted by the second touch panel. In other words, the capacitive communication of the touch panel provided by the present invention may be simplex or full duplex. The capacitive touch communication of the touch panel provided by the present invention may not be the same when the touch panels are placed in a face-to-face manner, and the size of the first touch panel and the second touch panel are not necessarily the same. Applicable to touch panels that are not aligned or have different sizes or different numbers of conductive strips.

In the communication of the touch panel of the present invention, including but not limited to, simplex, half duplex and full duplex. The capacitive coupling between the first touch panel and the second touch panel is a direct capacitive coupling between the first touch panel and the second touch panel, wherein the first touch panel and the second touch panel face each other The first touch panel and the second touch panel are configured to perform half-duplex or full-duplex transmission through capacitive coupling between the first region and the second region. In an example of the present invention, the first touch panel and the second touch panel respectively have a plurality of conductive strips, and the conductive strips of the first touch panel in the first area and the second touch panel are conductive in the second area The bars are not overlapping.

The one or more transmission conductive strips and the one or more receiving conductive strips corresponding to the first touch panel and the second touch panel may be referred to as a group of communication conductive strips. In other words, the capacitive communication of the touch panel provided by the present invention can separate a plurality of communication conductive strips, and can simultaneously provide multi-group communication for multi-bit parallel communication or multi-group serial communication. In an example of the present invention, two groups of communication conductive strips may be used for dual-rail communication, and the first group of communication strips and the second group of communication strips simultaneously transmit signals only by a group of communication strips, for example, A group of communication strips represents a signal when transmitting a signal, and a second group of communication strips represents a signal when transmitting a signal, thereby confirming whether the signal is correctly transmitted.

In addition, the first touch panel may first detect a portion where the hand approaches or covers the touch panel, and provides a driving signal to transmit signals by one or more conductive strips covered by the conductive medium, which saves a lot of power compared to the full screen driving. . Similarly, the second touch panel may also detect a portion of the conductive medium that approaches or covers the touch panel, and receives signals from one or more conductive strips covered by the conductive medium.

A person skilled in the art can infer the touch surface provided by the present invention. The capacitive communication of the board can be used to transmit sound data, image data, text data, commands or other information, especially for mobile phones, tablets, touch panels or other devices with touch panels, and is not limited to handheld devices. In addition, the touch panel is not limited to a projected capacitive touch panel, and may be a surface capacitive touch screen, a resistive touch screen, or the like. For example, the first touch panel for communication is a surface capacitive touch panel, and the second touch panel is a projected capacitive touch panel.

Please refer to FIG. 7 , which is a schematic diagram of communication performed by a touch panel according to a seventh embodiment of the present invention. Providing a driving signal to the capacitive touch panel, providing a ground potential of the first touch panel 71 to the at least one conductive strip 73 of the first touch panel 71, and providing a ground potential of the second touch panel 72 The at least one conductive strip 74 of the second touch panel 72 is such that the first touch panel 71 and the second touch panel 72 are capacitively coupled by a conductive strip that provides a ground potential, thereby reducing the first touch panel and the second touch The difference in the potential of the control panel indirectly.

For example, the conductive strips of the first touch panel arranged in the first direction are provided with driving signals, and the conductive strips facing the second direction are provided with a ground potential, and the conductive strips of the second touch panel aligned toward the first direction are provided. The ground potential and the conductive strips arranged in the second direction are used to detect the transmitted data. For another example, a plurality of continuously arranged conductive strips of the first touch panel may be provided with a driving signal, and all other conductive strips are provided with a ground potential, and the second touch panel is not provided with a conductive strip of the detected signal. Ground potential.

In a preferred mode of the present invention, the first touch panel has the aforementioned shielding conductive strip, and the shielding conductive strip is provided with a ground potential.

In an example of the present invention, in the foregoing step 630, at least one portion of the first touch panel and the second touch panel are respectively provided with a ground potential during communication, and the first touch panel and the first touch panel The two touch panels are capacitively coupled face-to-face with at least a portion of the ground potential to provide a ground potential between the first touch panel and the second touch panel. The capacitive coupling between the first touch panel and the second touch panel is a direct capacitive coupling between the first touch panel and the second touch panel, wherein the first touch panel and the second touch panel are face to face The area includes a first area and a second area. The first touch panel and the second touch panel perform half-duplex or full-duplex transmission through capacitive coupling between the first area and the second area.

In the first example of the present invention, the first touch panel and the second touch panel respectively have a plurality of first conductive strips that are provided with driving signals in the detecting mode and a plurality of first conductive strips that provide capacitive coupling signals by the driving signals. The two conductive strips communicate with each other in the first area and the second area, and the second conductive strip is provided with a ground potential in the detecting mode.

In the second example of the present invention, the first touch panel and the second touch panel respectively have a plurality of first conductive strips that are provided with driving signals in the detecting mode and a plurality of first conductive strips that provide capacitive coupling signals by the driving signals. The second conductive strip communicates with the second conductive strip in the first region and the second region, and the first conductive strip is provided with a ground potential in the detecting mode.

In a third example of the present invention, the first touch panel and the second touch panel respectively have a plurality of first conductive strips that are provided with driving signals in the detecting mode and a plurality of first conductive strips that provide capacitive coupling signals by the driving signals. a second conductive strip, and the first touch panel and the second touch panel face each other further include a third area, wherein the first area and the second area communicate with each other in a second conductive strip, and in the detection mode The second conductive strip of the three regions is supplied with a ground potential.

In the fourth example of the present invention, the first touch panel and the second touch panel respectively Having a plurality of first conductive strips that are provided with a drive signal in a detection mode and a plurality of second conductive strips that provide a capacitive coupling signal by a drive signal, wherein in the communication mode, the first conductive strip and the second One of the conductive strips is simultaneously provided with a drive signal, and the other of the first conductive strip and the second conductive strip are simultaneously provided with a ground signal.

According to the above method, in order to obtain a moving trajectory of an external object, a first full-screen mutual capacitance detection must be performed at a first time point to obtain a first 贰 dimensional sensing information, thereby determining that the external object is in the first At a time point, a first dimension coordinate of a touch panel is touched. Then, a second full-screen mutual capacitance detection is performed at a second time point to obtain a second dimension sensing information, thereby determining that the external object touches a second of the touch panel at the second time point.贰 Dimension coordinates. Then, the foregoing steps are repeated to obtain the movement trajectory of the external object.

For example, the touch panel includes M driving electrodes and N sensing electrodes. At the first time point, while driving a first driving electrode, sequentially detecting N sensing electrodes to obtain N driving the first driving electrodes corresponding to the N sensing electrodes The electrical signal of the sensing point. Accordingly, in order to obtain an electrical signal corresponding to each of the N sensing points of the N sensing electrodes, each of the driving electrodes must drive the M driving electrodes, and each driving driving electrode must detect N sensing electrodes. electrode. Therefore, it takes a total of M times to perform a full-screen mutual capacitance detection, detecting M x N times, which is quite time consuming.

Therefore, the present invention provides a touch method for the touch panel described above, and the touch method includes the following steps. As shown in FIG. 8, in step 802, a full-screen mutual capacitance detection is performed on the M driving electrodes and the N sensing electrodes in a first period to obtain M x N first electrical signals. In step 804, the at least one first driving electrode and the at least one first sensing electrode that the first external object touches or approaches are detected according to the M x N first electrical signals. In the steps 808, in a second period, performing a first mutual capacitance detection on the X strips of the driving electrodes and the Y strips of sensing electrodes to obtain X x Y second electrical signals. The M drive electrodes comprise the X drive electrodes, wherein the X is less than M. The N drive electrodes comprise the Y drive electrodes, wherein Y is less than or equal to N.

After the step 804, the first external object is determined to be at a first touch position of the first time period according to the M x N first electrical signals, as shown in step 810. After the step 808, the second external position of the first external object in the second time period can be determined according to the X x Y second electrical signals, as shown in step 812.

Moreover, after step 808, steps 804 and 808 may be repeatedly performed to detect the movement trajectory of the first external object.

In addition, a plurality of external objects can be simultaneously detected during the first time period, and a plurality of external objects can be simultaneously detected during the second time period. For example, in step 814, detecting at least one second driving electrode and at least one second sensing electrode that a second external object touches or approaches according to the M x N first electrical signals. In step 818, a second mutual capacitance detection is performed on the J driving electrodes and the K sensing electrodes in a second period to obtain J x K second electrical signals. The M drive electrodes comprise the J drive electrodes, wherein J is less than M. The N drive electrodes comprise the K drive electrodes, wherein K is less than or equal to N.

After step 814, the third external object is determined to be at a third touch position of the first time period according to the M x N first electrical signals, as shown in step 820. After step 818, the second external object is determined to be at a fourth touch position of the second time period according to the J x K second electrical signals, as shown in step 822.

Furthermore, after step 818, steps 814 and steps can be performed repeatedly. 818, to detect a movement trajectory of the second external object.

Referring to FIG. 9A, a touch panel includes M driving electrodes and N sensing electrodes. During a first period of time, a full-screen mutual capacitance detection is performed on the M driving electrodes and the N sensing electrodes to obtain M x N first electrical signals. And detecting, according to the M x N first electrical signals, the third and fourth driving electrodes and the third and fourth sensing electrodes that are touched or approached by the first external object EO1. In a second period, the third and fourth driving electrodes and the third and fourth sensing electrodes are selected to perform a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes. The X strips of the driving electrodes include the 3rd and 4th driving electrodes, and the Y strips of the sensing electrodes include the 3rd and 4th sensing electrodes.

Therefore, as shown in FIG. 9B, in the second period, the first mutual capacitance detection system is implemented on five driving electrodes and five sensing electrodes, wherein the five driving electrodes include the second driving electrode to the sixth Driving electrodes, the five sensing electrodes comprising a second sensing electrode to a sixth sensing electrode. In this way, the movement path of the first external object can be detected without completely detecting the full screen.

In another embodiment, as shown in FIG. 10A, according to the M x N first electrical signals of the first time period, the third and fourth pieces of the first external object EO1 touched or approached are simultaneously detected. The driving electrodes are the sixth and seventh driving electrodes and the fourth and fifth sensing electrodes that are in contact with or close to the third and fourth sensing electrodes, and a second external object EO2.

As shown in FIG. 10B, in the second period, the third and fourth driving electrodes and the third and fourth sensing electrodes are selected to perform the first mutual capacitance detection on the X driving electrodes and the Y sensing. The electrodes are selected, and the sixth and seventh driving electrodes and the fourth and fifth sensing electrodes are selected to perform a second mutual capacitance detection on the J driving electrodes and the K sensing electrodes.

For example, in the second period, the first mutual capacitance detection system is implemented in 5 drivers. The electrode and the five sensing electrodes, wherein the five driving electrodes comprise a second driving electrode to a sixth driving electrode, and the five sensing electrodes comprise a second sensing electrode to a sixth sensing electrode. In the same second period, the second mutual capacitance detection is performed on five driving electrodes and five sensing electrodes, wherein the five driving electrodes include a fourth driving electrode to an eighth driving electrode, and the five The sensing electrode includes a third sensing electrode to a seventh sensing electrode.

The above X, J may be any integer greater than 1, but less than M. The above Y, K may also be any integer greater than 1, but less than or equal to N.

Furthermore, in the above-mentioned full-screen mutual capacitance detection, when one driving electrode is driven, the N first electrical signals are obtained in D sub-periods. In each sub-period, the first electrical signal of the N/D sensing points is continuously detected, where Y is less than or equal to N/D. For example, the touch panel includes 60 sensing electrodes, and a multiplexer can electrically couple 20 sensing electrodes. In each sub-period, the multiplexer is electrically coupled to the 20 sensing electrodes for mutual capacitance detection. Therefore, only 20 first electrical signals can be detected in each sub-period, so the complete mutual capacitance detection corresponding to one driving electrode needs to be performed in 3 sub-periods.

According to the above, the present invention provides a touch control device, which is electrically coupled to a touch panel. The touch panel includes M driving electrodes and N sensing electrodes, wherein the touch processor performs the following steps: determining at least one a first driving electrode and at least one first sensing electrode touched or accessed by the external object; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, wherein the X driving The electrode includes the at least one first driving electrode, and the Y sensing electrodes comprise the at least one first sensing electrode, X is smaller than M, and Y is less than or equal to N.

In an embodiment of the present invention, the touch processor determines the at least one first driving electrode and the at least one first sensing electrode in a first period of time, and in a second period of time, the touch The control processor performs the first mutual capacitance detection, wherein the second time period is shorter than the first time period.

In another embodiment of the present invention, the touch processor performs a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes during the first time period to obtain M x N first electrical properties. signal. Then, the touch processor detects the at least one first driving electrode and the at least one first sensing electrode according to the M x N first electrical signals, thereby determining that the first external object is at the first A first touch position of the time period.

The above-mentioned full-screen mutual capacitance detection comprises the steps of: driving each driving electrode sequentially; detecting the first electrical signal of the driving electrode corresponding to the N sensing points of the N sensing electrodes by mutual capacitance detection The N first electrical signals are obtained in the D sub-periods, and the first electrical signals of the N/D sensing points are continuously detected in each sub-period, wherein Y is less than or equal to N/D And obtaining the M x N first electrical signals according to the N first electrical signals of each of the driving electrodes.

In another embodiment of the present invention, the touch processor obtains X x Y second electrical signals according to the first mutual capacitance detection to determine that the first external object is in a second time of the second time period. Touch the location.

In another embodiment of the present invention, the touch processor determines at least one second driving electrode and at least one second sensing electrode that the second external object touches or approaches during the first time period. Then, the touch processor performs a second mutual capacitance detection on the J driving electrodes and the K sensing electrodes in the second period, wherein the J driving electrodes comprise the at least one second driving electrode, and the K senses The measuring electrode comprises the at least one second sensing electrode, J is smaller than M, and K is less than or equal to N.

In another embodiment of the present invention, the touch processor performs a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes during the first time period to obtain M x N numbers. An electrical signal. Then, the touch processor detects the at least one second driving electrode and the at least one second sensing electrode according to the M x N first electrical signals, thereby determining that the second external object is at the first A third touch position of the time period.

In another embodiment of the present invention, the touch processor obtains J x K second electrical signals according to the second mutual capacitance detection to determine a fourth external object in the second time period. Touch the location.

According to the above, the present invention provides a touch method for a touch panel comprising M driving electrodes and N sensing electrodes. The touch method includes the following steps: determining at least one first driving electrode and at least one first sensing electrode that a first external object touches or approaches; and performing a first mutual capacitance detection on the X driving electrodes and Y sensing electrodes, wherein the X driving electrodes comprise the at least one first driving electrode, the Y sensing electrodes comprising the at least one first sensing electrode, X is less than M, and Y is less than or equal to N.

Determining the at least one first driving electrode and the at least one first sensing electrode in a first period of time, and performing the first mutual capacitance detection in a second period, wherein the second period is longer than the first period short.

In another embodiment of the present invention, during the first time period, performing a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes to obtain M x N first electrical signals; Determining, by the M x N first electrical signals, the at least one first driving electrode and the at least one first sensing electrode that are touched or approached by the first external object, thereby determining the first external object At a first touch position of the first time period.

The above-mentioned full-screen mutual capacitance detection comprises the steps of: driving each of the driving electrodes in sequence; detecting the driving electrode driven by the mutual capacitance corresponding to the N sensing electrodes a first electrical signal of the sensing point, wherein the N first electrical signals are obtained in the D sub-periods, and the first electrical signals of the N/D sensing points are continuously detected in each sub-period Where Y is less than or equal to N/D; and the M x N first electrical signals are obtained from the N first electrical signals of each of the drive electrodes.

The touch control method further includes: acquiring X x Y second electrical signals according to the first mutual capacitance detection to determine a second touch position of the first external object in the second time period.

The touch control method further includes: determining, during the first time period, at least one second driving electrode and at least one second sensing electrode that a second external object touches or approaches; and performing, in the second time period, a The second mutual capacitance is detected by the J driving electrodes and the K sensing electrodes, wherein the J driving electrodes comprise the at least one second driving electrode, and the K sensing electrodes comprise the at least one second sensing electrode, J Less than M, K is less than or equal to N.

In another embodiment of the present invention, the full-screen mutual capacitance detection is performed on the M driving electrodes and the N sensing electrodes to obtain the M x N first electrical signals. And detecting the at least one second driving electrode and the at least one second sensing electrode according to the M x N first electrical signals, thereby determining that the second external object is in a third of the first time period Touch the location.

The touch control method further includes: obtaining, according to the second mutual capacitance detection, J x K second electrical signals to determine a fourth touch position of the second external object in the second time period.

Furthermore, the present invention provides a touch method for the touch panel described above, and the touch method includes the following steps. As shown in FIG. 8, in step 802, a first time period is performed. A full-screen mutual capacitance is detected in the M driving electrodes and the N sensing electrodes to obtain M x N first electrical signals. In step 804, the at least one first driving electrode and the at least one first sensing electrode that the first external object touches or approaches are detected according to the M x N first electrical signals. In step 806, a first one of the at least one first driving electrode is selected, and one of the at least one first sensing electrodes is selected. In step 808, a first mutual capacitance detection is performed on the X driving electrodes and the Y sensing electrodes in a second period to obtain X x Y second electrical signals. The M driving electrodes comprise the X driving electrodes, and the X driving electrodes comprise the selected first driving electrodes, wherein the X is less than M. The N driving electrodes comprise the Y driving electrodes, and the Y sensing electrodes comprise the selected first sensing electrodes, wherein Y is less than N.

After the step 804, the first external object is determined to be at a first touch position of the first time period according to the M x N first electrical signals, as shown in step 810. After the step 808, the second external position of the first external object in the second time period can be determined according to the X x Y second electrical signals, as shown in step 812.

Moreover, after step 808, step 806 to step 808 may be repeatedly performed to detect the movement trajectory of the first external object.

In addition, a plurality of external objects can be simultaneously detected during the first time period, and a plurality of external objects can be simultaneously detected during the second time period. For example, in step 814, detecting at least one second driving electrode and at least one second sensing electrode that a second external object touches or approaches according to the M x N first electrical signals. In step 816, a second one of the at least one second driving electrode is selected, and one of the at least one second sensing electrodes is selected. In step 818, in a second period, a second mutual capacitance detection is performed on the J driving electrodes and K sense electrodes to obtain J x K second electrical signals. The M driving electrodes comprise the J driving electrodes, and the J driving electrodes comprise the selected second driving electrodes, wherein J is less than M. The N driving electrodes comprise the K driving electrodes, and the K sensing electrodes comprise the selected second sensing electrodes, wherein K is less than N.

After step 814, the third external object is determined to be at a third touch position of the first time period according to the M x N first electrical signals, as shown in step 820. After step 818, the second external object is determined to be at a fourth touch position of the second time period according to the J x K second electrical signals, as shown in step 822.

Moreover, after step 818, steps 816 to 818 may be repeatedly performed to detect the movement trajectory of the second external object.

Referring to FIG. 9A, a touch panel includes M driving electrodes and N sensing electrodes. During a first period of time, a full-screen mutual capacitance detection is performed on the M driving electrodes and the N sensing electrodes to obtain M x N first electrical signals. And detecting, according to the M x N first electrical signals, the third and fourth driving electrodes and the third and fourth sensing electrodes that are touched or approached by the first external object EO1. In a second period, the fourth driving electrode and the fourth sensing electrode are selected to perform a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes. The X strip of the drive electrode includes a fourth drive electrode, and the Y strip of the sense electrode includes a fourth sense electrode.

Therefore, as shown in FIG. 9B, in the second period, the first mutual capacitance detection system is implemented on five driving electrodes and five sensing electrodes, wherein the five driving electrodes include the second driving electrode to the sixth Driving electrodes, the five sensing electrodes comprising a second sensing electrode to a sixth sensing electrode. In this way, the movement path of the first external object can be detected without completely detecting the full screen.

In another embodiment, as shown in FIG. 10A, according to the M x N first electrical signals of the first time period, the third and fourth pieces of the first external object EO1 touched or approached are simultaneously detected. The driving electrodes are the sixth and seventh driving electrodes and the fourth and fifth sensing electrodes that are in contact with or close to the third and fourth sensing electrodes, and a second external object EO2.

As shown in FIG. 10B, in the second period, the fourth driving electrode and the fourth sensing electrode are selected to perform the first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, and selecting The sixth driving electrode and the fifth sensing electrode are configured to perform a second mutual capacitance detection on the J driving electrodes and the K sensing electrodes.

For example, in the second period, the first mutual capacitance detection system is performed on five driving electrodes and five sensing electrodes, wherein the five driving electrodes include a second driving electrode to a sixth driving electrode, and the fifth driving electrode The strip sensing electrode includes a second sensing electrode to a sixth sensing electrode. In the same second period, the second mutual capacitance detection is performed on five driving electrodes and five sensing electrodes, wherein the five driving electrodes include a fourth driving electrode to an eighth driving electrode, and the five The sensing electrode includes a third sensing electrode to a seventh sensing electrode.

The above X, J may be any integer greater than 1, but less than M. The above Y and K may also be any integer greater than 1, but less than N.

However, the first mutual capacitance detection system is performed from the second driving electrode to the sixth driving electrode, and the second sensing electrode to the sixth sensing electrode. Therefore, in the second period, the second driving electrode to the eighth driving electrode are sequentially driven, and the second sensing electrode is detected to the seventh sensing electrode by mutual capacitance, so that the first The movement trajectory of the outer object EO1 and the second outer object EO2.

Furthermore, in the above-mentioned full-screen mutual capacitance detection, when driving one driving electrode, The N first electrical signals are obtained in D sub-periods. In each sub-period, the first electrical signal of the N/D sensing points is continuously detected, where Y is less than or equal to N/D. For example, the touch panel includes 60 sensing electrodes, and a multiplexer can electrically couple 20 sensing electrodes. In each sub-period, the multiplexer is electrically coupled to the 20 sensing electrodes for mutual capacitance detection. Therefore, only 20 first electrical signals can be detected in each sub-period, so the complete mutual capacitance detection corresponding to one driving electrode needs to be performed in 3 sub-periods.

According to the above, the present invention provides a touch processor electrically coupled to a touch panel. The touch panel includes M driving electrodes and N sensing electrodes, wherein the touch processor performs the following steps: determining a first a first driving electrode and a first sensing electrode touched by the external object; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, wherein the X driving electrodes comprise the first a driving electrode, the Y sensing electrodes comprising the first sensing electrode, X is less than M, and Y is less than N.

In an embodiment of the invention, the touch processor determines the first driving electrode and the first sensing electrode in a first time period, and in a second time period, the touch processor executes the first mutual Capacitance detection, wherein the second time period is shorter than the first time period.

In another embodiment of the present invention, the touch processor performs a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes during the first time period to obtain M x N first electrical properties. signal. Then, according to the M x N first electrical signals, the touch processor detects at least one first driving electrode and at least one first sensing electrode that the first external object touches or approaches, thereby determining the The first external object is in a first touch position of the first time period, wherein the at least one first driving electrode comprises the first driving electrode, and the at least one first sensing electrode comprises the first sensing electrode.

The above-mentioned full-screen mutual capacitance detection comprises the steps of: driving each driving electrode sequentially; detecting the first electrical signal of the driving electrode corresponding to the N sensing points of the N sensing electrodes by mutual capacitance detection The N first electrical signals are obtained in the D sub-periods, and the first electrical signals of the N/D sensing points are continuously detected in each sub-period, wherein Y is less than or equal to N/D And obtaining the M x N first electrical signals according to the N first electrical signals of each of the driving electrodes.

In another embodiment of the present invention, the touch processor obtains X x Y second electrical signals according to the first mutual capacitance detection to determine that the first external object is in a second time of the second time period. Touch the location.

In another embodiment of the present invention, the touch processor determines a second driving electrode and a second sensing electrode that are touched by the second external object during the first time period. Then, the touch processor performs a second mutual capacitance detection on the J driving electrodes and the K sensing electrodes in the second period, wherein the J driving electrodes comprise the second driving electrodes, and the K sensing electrodes The second sensing electrode is included, J is less than M, and K is less than N.

In another embodiment of the present invention, the touch processor performs a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes during the first time period to obtain M x N first electrical properties. signal. Then, the touch processor detects at least one second driving electrode and at least one second sensing electrode that the second external object touches or approaches according to the M x N first electrical signals, thereby determining the The second external object is in a third touch position of the first time period, wherein the at least one second driving electrode comprises the second driving electrode, and the at least one second sensing electrode comprises the second sensing electrode.

In another embodiment of the present invention, the touch processor detects the second mutual capacitance The J x K second electrical signals are obtained to determine a fourth touch position of the second external object during the second time period.

According to the above, the present invention provides a touch method for a touch panel comprising M driving electrodes and N sensing electrodes. The touch method includes the following steps: determining a first driving electrode and a first sensing electrode touched by a first external object; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing The measuring electrode, wherein the X driving electrodes comprise the first driving electrode, the Y sensing electrodes comprise the first sensing electrode, X is smaller than M, and Y is smaller than N.

Determining the first driving electrode and the first sensing electrode during a first time period, and performing the first mutual capacitance detection in a second time period, wherein the second time period is shorter than the first time period.

The touch control method further includes: performing a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes to obtain M x N first electrical signals during the first time period; The M x N first electrical signals detect the at least one first driving electrode and the at least one first sensing electrode that the first external object touches or approaches, thereby determining that the first external object is a first touch position of the first time period, wherein the at least one first driving electrode comprises the first driving electrode, and the at least one first sensing electrode comprises the first sensing electrode.

The above-mentioned full-screen mutual capacitance detection comprises the steps of: driving each driving electrode in sequence; detecting the first electrical property of the driving electrode corresponding to the N sensing points of the N sensing electrodes by mutual capacitance detection a signal, wherein in the D sub-periods, the N first electrical signals are obtained, and in each sub-period, the first electrical signals of the N/D sensing points are continuously detected, where Y is less than or equal to N/ D; and obtaining the M x N according to the N first electrical signals of each of the driving electrodes The first electrical signal.

The touch control method further includes: acquiring X x Y second electrical signals according to the first mutual capacitance detection to determine a second touch position of the first external object in the second time period.

The touch control method further includes: determining, during the first time period, a second driving electrode and a second sensing electrode touched by the second external object; and performing a second mutual capacitance during the second time period Detecting J driving electrodes and K sensing electrodes, wherein J driving electrodes comprise the second driving electrodes, and K sensing electrodes comprise the second sensing electrodes, J is smaller than M, and K is smaller than N.

The touch control method further includes: performing, during the first time period, the full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes to obtain the M x N first electrical signals; Determining, according to the M x N first electrical signals, at least one second driving electrode and at least one second sensing electrode that the second external object touches or approaches, thereby determining that the second external object is in the a third touch position of the first time period, wherein the at least one second driving electrode comprises the second driving electrode, and the at least one second sensing electrode comprises the second sensing electrode.

The touch control method further includes: obtaining, according to the second mutual capacitance detection, J x K second electrical signals to determine a fourth touch position of the second external object in the second time period.

Furthermore, the present invention further provides a touch processor electrically coupled to a touch panel, the touch panel includes a plurality of first conductive strips and a plurality of second conductive strips, wherein the touch processor performs the following steps Providing a driving signal to all of the first conductive strips in sequence; detecting a signal of all the second conductive strips to obtain a corresponding first when each of the first conductive strips is supplied with a driving signal a first dimension sensing information of the conductive strip; generating a first dimension sensing information according to all the first dimension sensing information; determining, according to the first dimension sensing information, whether at least one external object is approaching or covering The touch panel.

When the at least one external object approaches or covers the touch panel according to the first dimension sensing information, the touch processor further performs the following steps: determining the at least one according to the first UI dimension sensing information. The external object approaches or covers at least one first dimension coordinate and at least one second dimension coordinate of the touch panel; and determines at least one mutual capacitance according to the at least one first dimension dimension and the at least one second dimension dimension respectively Detecting the range, and performing mutual capacitance detection on the at least one mutual capacitance detection range to generate a second 贰 dimensional sensing information corresponding to the at least one mutual capacitance detection range; The two-dimensional dimension sensing information determines at least one third-dimensional dimension coordinate and at least one fourth-dimensional dimension coordinate.

In an embodiment of the present invention, the at least one external object includes a first external object, and the touch processor further performs the following steps: determining, according to the first 贰 dimension sensing information, the first external object The first 壹 dimension coordinate and the second 壹 dimension coordinate to determine a first mutual capacitance detection range; and the first mutual capacitance detection range is mutually capacitively detected to generate corresponding to the first The second 贰 dimension sensing information of the mutual capacitance detection range; and determining the third 壹 dimension coordinate and the fourth 壹 dimension coordinate corresponding to the first external object according to the second 贰 dimension sensing information.

The at least one external object further includes a second external object, and the touch processor further performs the following steps: determining, according to the first 贰 dimension sensing information, the first 壹 dimension coordinates corresponding to the second external object The second dimension is configured to determine a second mutual capacitance detection range; and the second mutual capacitance detection range and the second mutual capacitance detection range are simultaneously performed Mutual capacitance detection to generate the second 贰 dimensional sensing information corresponding to the first mutual capacitance detection range and the second mutual capacitance detection range; and determining the sensing information according to the second 贰 dimension The third 壹 dimension coordinate corresponding to the first external object and the third 壹 dimension coordinate and the third 壹 dimension coordinate and the fourth 壹 dimension coordinate corresponding to the second external object.

Accordingly, the present invention further provides a touch method for a touch panel, the touch panel includes a plurality of first conductive strips and a plurality of second conductive strips, wherein the touch method includes the following steps: sequentially providing Driving a signal to all of the first conductive strips; detecting a signal of all the second conductive strips to obtain a first sensed dimension sensing information corresponding to the first conductive strips when each of the first conductive strips is provided with a driving signal; Generating a first dimension sensing information according to all the first dimension sensing information; determining, according to the first dimension sensing information, whether at least one external object approaches or covers the touch panel.

When the at least one external object approaches or covers the touch panel according to the first dimension sensing information, the touch method further includes the following steps: determining the at least one external component according to the first UI dimension sensing information. The object approaches or covers at least one first 壹 dimension coordinate and at least one second 壹 dimension coordinate of the touch panel; and at least one mutual capacitance is determined according to the at least one first 壹 dimension coordinate and the at least one second 壹 dimension coordinate respectively Detecting the range, and performing mutual capacitance detection on the at least one mutual capacitance detection range to generate a second 贰 dimensional sensing information corresponding to the at least one mutual capacitance detection range; and according to the second The dimension sensing information determines at least one third dimension coordinate and at least one fourth dimension coordinate.

In an embodiment of the present invention, the at least one external object includes a first external object, and the touch method further includes the step of: determining the corresponding external object based on the first 贰 dimension sensing information The first dimension dimension and the second dimension coordinate are determined a first mutual capacitance detection range; performing mutual capacitance detection on the first mutual capacitance detection range to generate the second 贰 dimensional sensing information corresponding to the first mutual capacitance detection range; And determining, according to the second 贰 dimension sensing information, the third 壹 dimension coordinate and the fourth 壹 dimension coordinate corresponding to the first external object.

The at least one external object further includes a second external object, and the touch method further comprises the steps of: determining, according to the first 贰 dimension sensing information, the first 壹 dimension coordinate corresponding to the second external object and the a second dimensioning block is configured to determine a second mutual capacitance detection range; and the second mutual capacitance detection range and the second mutual capacitance detection range are mutually capacitively detected to generate a corresponding The first mutual capacitance detection range and the second 贰 dimension sensing information of the second mutual capacitance detection range; and determining, according to the second 贰 dimension sensing information, the corresponding to the first external object The third 壹 dimension coordinate and the fourth 壹 dimension coordinate and the third 壹 dimension coordinate and the fourth 壹 dimension coordinate corresponding to the second external object.

The first mutual capacitance detection range and the second mutual capacitance detection range may be separated or overlapped.

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.

802-822‧‧‧Steps

Claims (20)

A touch control device electrically couples a touch panel, the touch panel includes M driving electrodes and N sensing electrodes, wherein the touch processor performs the following steps: determining whether a first external object touches or approaches At least one first driving electrode and at least one first sensing electrode; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, wherein the X driving electrodes comprise the at least one a driving electrode, the Y sensing electrodes comprising the at least one first sensing electrode, X being less than M, and Y being less than or equal to N. According to the touch processor of claim 1, wherein the touch processor determines the at least one first driving electrode and the at least one first sensing electrode in a first period of time, and in a second period of time, The touch processor performs the first mutual capacitance detection, wherein the second time period is shorter than the first time period. According to the touch processor of claim 2, in the first time period, performing a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes to obtain M x N An electrical signal; and detecting the at least one first driving electrode and the at least one first sensing electrode according to the M x N first electrical signals, thereby determining that the first external object is at the first A first touch position of the time period. According to the touch processor of claim 3, wherein the full-screen mutual capacitance detection comprises the steps of: driving each of the driving electrodes in sequence; detecting the driving electrodes driven by the mutual capacitance corresponding to the N senses N of the measuring electrode a first electrical signal of the sensing points, wherein the N first electrical signals are obtained in the D sub-periods, and the first electrical properties of the N/D sensing points are continuously detected in each of the sub-periods a signal, wherein Y is less than or equal to N/D; and obtaining the M x N first electrical signals based on the N first electrical signals of each of the drive electrodes. According to the touch processor of claim 2, the method further comprises: obtaining X x Y second electrical signals according to the first mutual capacitance detection, to determine that the first external object is in the second time period The second touch position. According to the touch processor of claim 2, in the first period, determining at least one second driving electrode and at least one second sensing electrode that a second external object touches or approaches; During the second time period, a second mutual capacitance detection is performed on the J driving electrodes and the K sensing electrodes, wherein the J driving electrodes comprise the at least one second driving electrode, and the K sensing electrodes comprise the at least one The second sensing electrode, J is smaller than M, and K is less than or equal to N. According to the touch processor of claim 6 , in the first time period, performing a full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes to obtain M x N An electrical signal; and detecting the at least one second driving electrode and the at least one second sensing electrode according to the M x N first electrical signals, thereby determining that the second external object is at the first A third touch position of the time period. According to the touch processor of the second application patent scope, the implementation further: According to the second mutual capacitance detection, J x K second electrical signals are obtained to determine a fourth touch position of the second external object in the second time period. A touch method is applied to a touch panel, the touch panel includes M driving electrodes and N sensing electrodes, wherein the touch processor performs the following steps: determining that at least a first external object touches or approaches a first driving electrode and at least one first sensing electrode; and performing a first mutual capacitance detection on the X driving electrodes and the Y sensing electrodes, wherein the X driving electrodes comprise the at least one first driving The electrode, the Y sensing electrodes comprise the at least one first sensing electrode, X is less than M, and Y is less than or equal to N. The touch method of claim 9, wherein the at least one first driving electrode and the at least one first sensing electrode are determined in a first period of time, and the first mutual capacitance is performed in a second period of time Detecting, wherein the second time period is shorter than the first time period. According to the touch method of claim 10, in the first time period, a full-screen mutual capacitance detection is performed on the M driving electrodes and the N sensing electrodes to obtain M x N first And detecting, according to the M x N first electrical signals, the at least one first driving electrode and the at least one first sensing electrode that are touched or approached by the first external object, thereby determining The first outer object is at a first touch position of the first time period. According to the touch method of claim 10, the full-screen mutual capacitance detection comprises the following steps: driving each driving electrode in sequence; The first electrical signal corresponding to the N sensing points of the N sensing electrodes is detected by the mutual capacitance detection, wherein the N first electrical signals are obtained in the D sub-periods, In each sub-period, continuously detecting a first electrical signal of the N/D sensing points, where Y is less than or equal to N/D; and obtaining the M according to the N first electrical signals of each driving electrode x N first electrical signals. According to the touch method of claim 10, the method further includes: obtaining X x Y second electrical signals according to the first mutual capacitance detection, to determine that the first external object is in the second time period Two touch positions. The touch method of claim 10, further comprising: determining, during the first time period, at least one second driving electrode and at least one second sensing electrode that a second external object touches or approaches; and During the second time period, a second mutual capacitance detection is performed on the J driving electrodes and the K sensing electrodes, wherein the J driving electrodes comprise the at least one second driving electrode, and the K sensing electrodes comprise the at least one Two sensing electrodes, J is less than M, and K is less than or equal to N. According to the touch method of claim 14, the method further includes: performing the full-screen mutual capacitance detection on the M driving electrodes and the N sensing electrodes during the first time period to obtain the M x N An electrical signal; and detecting the at least one second driving electrode and the at least one second sensing electrode according to the M x N first electrical signals, thereby determining that the second external object is at the first A third touch position of the time period. According to the touch method of claim 10, the method further includes: obtaining, according to the second mutual capacitance detection, J x K second electrical signals to determine that the second external object is in the second time period Four touch positions. A touch control device is electrically coupled to a touch panel, the touch panel includes a plurality of first conductive strips and a plurality of second conductive strips, wherein the touch processor performs the following steps: sequentially providing driving signals to All of the first conductive strips; when each of the first conductive strips is supplied with a driving signal, detecting signals of all the second conductive strips to obtain a first sensed dimension sensing information corresponding to the first conductive strips; The first dimension sensing information generates a first dimension sensing information; determining, according to the first dimension sensing information, whether at least one external object approaches or covers the touch panel; and sensing according to the first dimension When the information is that the at least one external object approaches or covers the touch panel, the touch processor further performs the following steps: determining, according to the first 贰 dimension sensing information, that the at least one external object approaches or covers the touch panel At least one first 壹 dimension coordinate and at least one second 壹 dimension coordinate; determining at least one mutual according to the at least one first 壹 dimension coordinate and the at least one second 壹 dimension coordinate respectively Capturing the detection range, and performing mutual capacitance detection on the at least one mutual capacitance detection range to generate a second 贰 dimensional sensing information corresponding to the at least one mutual capacitance detection range; The second dimension sensing information determines at least one third dimension coordinate and at least one fourth dimension coordinate. The touch processor of claim 17, wherein the at least one external object comprises a first external object, and the touch processor further performs the following steps: Determining, according to the first 贰 dimension sensing information, the first 壹 dimension coordinate and the second 壹 dimension coordinate corresponding to the first external object to determine a first mutual capacitance detection range; the first mutual capacitance The detection range performs mutual capacitance detection to generate the second 贰 dimensional sensing information corresponding to the first mutual capacitance detection range; and determining, according to the second 贰 dimensional sensing information, corresponding to the The third dimension coordinate of the outer object and the fourth dimension coordinate. The touch processor of claim 18, wherein the at least one external object further comprises a second external object, and the touch processor further performs the following steps: determining the right according to the first 贰 dimension sensing information The first 壹 dimension coordinate of the second external object and the second 壹 dimension seat should be determined to determine a second mutual capacitance detection range; and the second mutual capacitance detection range and the second mutual capacitance type The detection range is mutually capacitively detected to generate the second 贰 dimensional sensing information corresponding to the first mutual capacitance detection range and the second mutual capacitance detection range; and according to the second 贰 dimension The sensing information determines the third 壹 dimension coordinate and the fourth 壹 dimension coordinate corresponding to the first external object and the third 壹 dimension coordinate and the fourth 壹 dimension coordinate corresponding to the second external object. The touch processor according to claim 19, wherein the first mutual capacitance detection range is separated or overlapped from the second mutual capacitance detection range.