TW201525819A - Touch controller, touch system, and method for detecting a touch screen - Google Patents

Abstract

The invention discloses a touch controller, a touch system and a method for detecting a touch screen. At first, a full screen driven detection is performed on a touch screen to determine whether at least one external object is touching or approaching the touch screen. Next, when the full screen driven detection represents that no external object touches or approaches the touch screen, an updating determination is performed to determine whether reference values are updated during a predetermined period of time. When the updating determination represents that updating determination is not performed over predetermined period of time, the reference values are updated based on a first 2D sensing information.

Description

Touch controller, touch system and touch screen detection method

The invention relates to a method for detecting a touch controller, a touch system and a touch screen, in particular to a method for detecting a touch controller, a touch system and a touch screen for avoiding water misjudgment.

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.

According to this, the capacitance value image when not touched can be obtained as a reference by The difference between the reference and the subsequently detected capacitance value image is used to determine whether the external conductive object is approached or covered, and the position to be approached or covered is further determined.

However, if there is a conductive material that spans more than two conductive layers on the insulating surface When the strip 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, thereby causing misjudgment. For example, when water stains cross two or more conductive strips on an insulating surface layer, the capacitance value image changes, which is mistaken for finger pressure.

It can be seen that the above prior art obviously has inconveniences and defects, and it is extremely difficult to add To further improve. 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.

According to an embodiment of the present invention, a method for detecting a touch screen includes: performing a full screen drive detection on the touch screen to determine whether at least one external object approaches or touches the touch screen; and when the full screen drive detects the display When there is no at least one external object approaching or touching the touch screen, performing an update determination to determine whether to update a reference during a predetermined update time; and not performing when the update determination indicates that the reference exceeds the predetermined update time When updating, the benchmark is updated based on a first 2D sensing information.

According to another embodiment of the present invention, a touch controller is provided to perform a full screen drive detection on a touch screen to determine whether there is at least one external object connection. Approaching or touching the touch screen; when the full screen drive detection indicates that the at least one external object is approaching or touching the touch screen, performing an update determination to determine whether to update a reference during a predetermined update time; When the update judges that the reference does not perform the update beyond the predetermined update time, the reference is updated according to a first 2D sensing information.

According to another embodiment of the present invention, a touch system is provided, including: a touch And a touch controller, performing: performing a full screen drive detection on the touch screen to determine whether there is at least one external object approaching or touching the touch screen; when the full screen drive detection display does not exist the at least one When the external object approaches or touches the touch screen, an update determination is performed to determine whether to update a reference during a predetermined update time; and when the update determines that the reference exceeds the predetermined update time, the update is not performed, according to The first 2D sensing information updates the reference.

With the above technical solution, the present invention has at least the following advantages and advantages: 1. No matter whether there is water stain or other conductive object on the touch screen that is not coupled to the external ground, full-screen drive detection can determine whether there is a coupled external The external conductive object of the ground approaches or covers, and can further confirm or adjust the external conductive object of the ground without the coupling to perform the reference update; and 2. The full-screen drive detection is compared with the two-dimensional mutual capacitance detection, When saving power, it is more suitable for judging whether to enter the power saving mode.

100‧‧‧ position detection device

110‧‧‧ display

120‧‧‧ touch screen

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 screen

72‧‧‧Second touch screen

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

800~850‧‧‧Steps

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.

FIG. 3 is a flow chart showing the determination position according to the result of full-screen driving detection and two-dimensional mutual capacitance detection according to the second embodiment of the present invention.

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 a touch screen communication according to a sixth embodiment of the present invention.

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

FIG. 8 is a block flow diagram of a method for detecting a touch screen according to an embodiment of the invention.

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

Referring to FIG. 1A, the present invention provides a position detecting device 100 including a touch. The screen 120 is coupled to a driving/detecting unit 130. The touch screen 120 has a sensing layer. In one example of the present invention, a first sensing layer 120A and a second sensing layer 120B may be included. The first sensing layer 120A and the second sensing layer 120B respectively have a plurality of conductive strips 140, of which the first The plurality of first conductive strips 140A of the sensing layer 120A overlap the plurality of second conductive strips 140B of the second sensing layer 120B. 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 screen 120 may be disposed on the display 110. The touch screen 120 and the display 110 may be provided with a shielding layer (not shown) or no shielding layer. In a preferred example of the present invention, in order to make the thickness of the touch screen 120 thinner, no shielding layer is disposed between the touch screen 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 screen 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, I2C, Bluetooth, WiFi, IR Various wired or wireless transmission interfaces. In one 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 information that the controller 160 can provide.

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 screen 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 screen, including an insulating substrate 17 and a portion of the second conductive strip ( 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 screen includes an insulating surface layer, a first sensing layer having the first conductive strip, an insulating layer, and a second surface having the second conductive strip. Sensing layer. In another example of the present invention, the capacitive touch screen 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 two conductive strips are arranged in parallel with the opposite long sides.

1F is a cross-sectional view of a single-layer capacitive touch screen, including an insulating substrate 17 and a portion of a second conductive strip (including Two connecting wires 12), an insulating layer 18, and a portion of the first conductive strip (including conductive The sheet 14, the first connecting line 15, the conductive sheet 16) and the insulating surface layer 19. The conductive strips 14 and 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 bridges the second connecting line 12 in a bridging manner, wherein the first connecting line 15 is The second connecting wires 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 screen to the external conductive object and then flowing into the capacitive touch screen. 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 based on the second conductive strip The signal generation of 22 may also 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 generated based on the current, voltage, capacitive coupling amount, amount of charge, or other electronic characteristics of the signal, and may be in the form of analog or digital. 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 (center of gravity) position is calculated from the signal value of the range of the proximity or touch of the external conductive object (centroid) Position). The position detecting device may generate a reference from the signal of the second conductive strip when there is actually no external conductive object approaching or covering the touch screen, or when the system does not determine that the external conductive object approaches or covers the touch screen. 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 screen, 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 screen by the external conductive object, and the proximity or covering of the touch screen 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 screen. 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 exhibit 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 screen has the shielding conductive strip 21, the full-screen driving further includes simultaneously providing driving signals to all of the shielding conductive strips 21, that is, simultaneously providing driving signals to the whole The first conductive strip 23 of the portion is shielded from the conductive strip 21. In the following description, at the time of full-screen drive detection, simultaneously providing a drive signal to all of the first conductive strips 23 also means providing a drive signal to all of the shielded conductive strips 21 at the same time. If the touch screen 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 and 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 screen.

In an example of the invention, the touch screen has the aforementioned shielding 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 a driving signal is provided, the The shielded strip is simultaneously provided with a constant current potential or coupled to the ground of the system.

For example, a touch screen detecting device according to the present invention includes: a touch screen, the touch screen includes a plurality of first conductive strips, a plurality of second conductive strips, and a plurality of shielding conductive strips, wherein the first conductive strips, 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; and simultaneously providing a driving signal When all the first conductive strips and all the shielding conductive strips are detected, the mutual capacitive coupling signals of all the second conductive strips are detected to obtain one-dimensional sensing information according to the signals of all the second conductive strips; and according to a dimension Sensing information to determine whether at least one external conductive object coupled to the ground approaches and touches the touch screen; and the controller determines, according to the one-dimensional sensing information, that at least one external conductive object coupled to the ground approaches and touches the touch screen, and executes A two-dimensional mutual capacitance detection to obtain a two-dimensional sensing information, to determine each coupling according to the two-dimensional sensing information The position of the external conductive object on the ground, wherein the two-dimensional mutual capacitance detection comprises: providing one driving signal to the different one or more conductive strips in the first conductive strip in turn, and providing all the shielding conductive strips to be galvanically charged Bits; respectively, when each of the one or more conductive strips in the first conductive strip is supplied with a driving signal, detecting signals of all the second conductive strips to obtain mutual capacitive coupling according to all the second conductive strips The signal generates one-dimensional sensing information corresponding to the first conductive strip to which the driving signal is supplied; and a set of one-dimensional sensing information corresponding to the first conductive strip to which the driving signal is supplied to generate two-dimensional sensing 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 the one-dimensional sensing information is stored. At least one zero-crossing between adjacent positive values and a negative value, when there is at least one zero crossing, indicating that at least one external conductive object coupled to the ground approaches or touches Touch the touch screen. 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 capacitive touch screen detection 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 there is at least one value exceeding the threshold value, indicates that at least one external conductive object coupled to the ground approaches or touches the touch screen. 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 screen. 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.

Briefly, 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 connected to the ground is close to or touched. touch screen. A person skilled in the art can infer that the one-dimensional sensing information can also be other than 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 This is not limited.

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 screen increases, the number of conductive strips also increases. However, the controller can be used to 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 or coverage of the external conductive object, the positive touch will not be judged with or without the adhesion of the conductive material, 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 overlay of the external conductive object is not determined The cover returns to step 210 to perform full-screen drive detection again. In an example of the present invention, the period for performing full-screen drive detection is fixed, that is, during a period of continuous full-screen drive detection, the interval between two adjacent full-screen drive detections is one. Detection cycle. 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 and touches the touch screen, the drive signal is provided 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 of the first conductive strips, it is determined that there is an external conductive object coupled to the ground when approaching and touching the touch screen, and the driving signal is The number is supplied to all of the first conductive strips at the first frequency.

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, according to the one-dimensional sensing information, whether at least one external conductive object coupled to the ground approaches and touches the touch screen to determine whether to perform a two-dimensional mutual capacitance detection, wherein the two-dimensional mutual capacitance The detecting method is to detect the mutual capacitive coupling signals of all the second conductive strips when a part of the first conductive strips of the first conductive strip is 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 340 As shown, at least one mutual capacitance detection range is determined according to a conductive strip that is approached or covered by the external conductive object. 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 and touches the touch screen, including: determining, according to the first one-dimensional sensing information. 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 dimension sensing information determines a second one-dimensional coordinate of each of the outer conductive objects coupled to the ground; respectively, each of the first one-dimensional coordinates respectively corresponds to a two-dimensional coordinate formed by each of the second one-dimensional coordinates; respectively The intersection of the first conductive strip and the second conductive strip closest to each two-dimensional coordinate is a corresponding overlap; and mutual capacitance is respectively performed on the corresponding detected overlap of each two-dimensional coordinate Detection detects a mutual capacitive coupling signal at the corresponding overlap of each two-dimensional coordinate to determine one or two external conductive objects coupled to the ground. Degree coordinate.

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 there is at least one external conductive object coupled to the ground approaching and touching the touch screen, including: according to the first The one-dimensional sensing information determines a mutual capacitance detection range according to the first one-dimensional sensing information and the second one-dimensional sensing information; and the mutual capacitance detection of the mutual capacitance detection range is performed according to the The mutual capacitive coupling signal at the intersection of all the first conductive strips and the second conductive strip in the mutual capacitance detection range generates a two-dimensional sensing information; and each coupling is determined according to the two-dimensional sensing information The location of the external conductive object on the 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, Mut-capacitance detection is performed on the first mutual capacitance detection range to determine at least one second one-dimensional coordinate corresponding to each first one-dimensional coordinate. 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 is close to the touch touch screen comprises: determining at least one first one-dimensional coordinate according to the first dimension 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 one corresponding to each first one-dimensional coordinate Dimensional sensing information; generating at least one second dimension coordinate corresponding to each first dimension coordinate according to a second one-dimensional sensing information corresponding to each first dimension node; and respectively The one-dimensional coordinates and the corresponding second one-dimensional coordinates 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 third The one-dimensional 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 and touches the touch screen according to the one-dimensional sensing information, the method further includes: determining, according to the first dimension sensing information, at least one first one-dimensional coordinate; A first one-dimensional coordinate determines a first mutual capacitance detection range, and performs mutual capacitance detection on the first mutual capacitance detection range to generate one corresponding to each first one-dimensional coordinate a second dimension sensing information; generating at least one second dimension coordinate corresponding to each first dimension coordinate according to a second one-dimensional sensing information corresponding to each first dimension node; respectively A second one-dimensional coordinate determines a second mutual capacitance detection range, and performs mutual capacitance detection on the second mutual capacitance detection range to generate one corresponding to each second one-dimensional coordinate The third dimension sensing information; generating at least one third corresponding to each second dimension coordinate according to the third one-dimensional sensing information corresponding to each second dimension coordinate Dimensional coordinates; 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, with the above-mentioned full-screen driving detection, whether or not there is water stain or other conductive object on the touch screen that is not coupled to the external ground, it can be judged whether there is an external conductive object that is coupled to the external ground to approach and touch. Further, when it is determined that the external conductive object with the ground outside the coupling is close to and touched, the two-dimensional mutual capacitance detection can determine that the external conductive object outside the coupling is close to or touched. Water stains or other conductive objects that do not couple to the outside of the ground. 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 screen 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 the proximity and contact of the conductive strips of the externally coupled ground, and the two-dimensional sensing information generated by the two-dimensional mutual capacitive detection can detect the ground coupled to the outside. The external conductive object is not coupled to the outside of the conductive strip 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 screen 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 screen, a corresponding negative touch or a negative touch with a positive touch will be presented in the two-dimensional sensing information. If the reference is updated, the reference will include the The negative touch 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 screen by means of 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. It is judged that the touch screen 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 screen. 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 invention, the reference is updated when no external conductive objects approach or cover the touch screen. For example, as described above, the full-screen drive detection first determines whether an external conductive object approaches or covers the touch screen, and the reference update is performed when no external conductive object approaches or covers the touch screen, which may include full-screen drive detection or/and mutual capacitance. The baseline update detected. For another 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 screen, and updates the reference when no external conductive object approaches or covers the touch screen.

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 determining, according to the one-dimensional sensing information, whether the external conductive object coupled to the ground contacts or covers the touch screen. If there is no at least one external conductive object coupled to the ground that approaches or covers the touch screen for more than a preset time, then as shown in step 210, full-screen drive detection continues. 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 approaching or covering the touch screen for a predetermined period of time, then as shown in steps 260 and 270, performing a two-dimensional mutual capacitance detection The measurement is performed to obtain a two-dimensional sensing information to update a reference according to 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 use the two-dimensional sensing information as an average of the original reference. 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 screen detecting device according to the present invention includes: a touch screen, the touch screen includes a plurality of first conductive strips and a plurality of second conductive strips; and a controller that performs a full screen driving detection, including: Simultaneously providing a driving signal to all of the first conductive strips; and simultaneously providing a driving signal to all of the first conductive strips, detecting mutual capacitive coupling signals of all the second conductive strips to obtain all the second conductive strips The signal generates one-dimensional sensing information; and determining, according to the one-dimensional sensing information, whether at least one external conductive object coupled to the ground approaches and touches the touch screen; and the controller determines that the preset is continued according to the one-dimensional sensing information. When there is no at least one external conductive object coupled to the ground approaching and touching the touch screen, performing a two-dimensional mutual capacitance detection to obtain a two-dimensional sensing information to update a reference according to the two-dimensional sensing information, wherein two Dimensional mutual capacitance detection includes: providing one driving signal in a different one or more of the first conductive strips in turn And detecting a signal of all the second conductive strips to obtain a mutual capacitive coupling signal according to all the second conductive strips when each of the one or more conductive strips in the first conductive strip is provided with a driving signal Generating one-dimensional sensing information corresponding to the first conductive strip to which the driving signal is supplied; and collecting one-dimensional sensing information corresponding to each of the first conductive strips to which the driving signal is supplied to generate two-dimensional sensing 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 screen, to sense information according to the two-dimensionality The position of each of the external conductive objects coupled to the ground is determined.

When the touch screen device is in the handheld device, it is possible to hold the hand of the handheld device when the device is turned on. Being close to or covering the touch screen. 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 screen 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 approaching or covering 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 screen or no conductive material is attached to the touch screen, so the normal reference (including the original reference DS) obtained should not exhibit a positive 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 screen or no conductive material is attached to the touch screen, 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 device is turned on, the hand is pressed against the touch screen, and not only the reference is positively touched, but the sensing information RS is also positively touched, and the two are the same, so even if the hand presses the touch The screen does not judge the proximity or contact of the external conductive object, and thus ignores the presence of the pressed part of the hand when the device is turned on, but the other parts of the touch screen can still operate normally. Once the hand is continuously pressed against the touch screen, 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 update can be performed. . 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 screen of the present invention can be used for transmitting information and receiving information, that is, the touch screen can be used for capacitive communication, and one or more or all of the first conductive signals of the driving signal are provided on the touch screen through the controller. The strip provides signal transmission and detects one, more or all of the second conductive strips through the controller to provide signal reception, so that the two touch screens can communicate in one direction or two directions.

In an example of the present invention, the touch screen may be in face-to-face communication, that is, the touch screen is capacitively communicated face to face across the insulating surface. For example, the touch screens of two handheld devices are stacked face to face for capacitive communication. In another example of the present invention, the touch screen may be capacitively communicated through the human body. For example, the user touches the touch screen of one handheld device with one hand, and touches the touch screen of the other handheld device with the other hand, and performs capacitive communication with the human body as a conductive medium. For another example, the first user and the second user respectively touch the touch screen of the first handheld device and the touch screen of the second handheld device, and when the first hand user contacts the second user body, the first handheld device can be made Capacitive communication with the touch screen 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 screens may be placed in separate pockets of two people, and when the two people shake hands or touch, the two touch screens can communicate.

Accordingly, the present invention provides a communication method of a touch screen, in which a first touch screen communicates with a second touch screen. The first touch screen and the second touch screen have a detection mode for detecting proximity or touch of the external conductive object. In addition, the first touch screen and the second touch screen have a communication mode via capacitive coupling communication between the first touch screen and the second touch screen to exchange or transmit a message. Therefore, a communication system is formed by the first touch screen and the second touch screen. 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 screen according to a sixth embodiment of the present invention. As shown in step 610, a first touch screen and a second touch screen are provided. Next, as shown in steps 620 and 630, a detection of the first touch screen and the second touch screen The mode detects proximity or touch of the external conductive object, respectively, and communicates in a communication mode between the first touch screen and the second touch screen via a capacitive coupling between the first touch screen and the second touch screen to exchange or transmit a message.

For example, the first touch screen has a transparent insulating layer and a conductive layer, and information is transmitted through the conductive layer via capacitive coupling with the second touch screen via the transparent insulating layer. In contrast, the second touch screen has a transparent insulating layer and a conductive layer, and the information is received through the conductive layer via the transparent insulating layer and capacitively coupled to the first touch screen. The capacitive coupling between the first touch screen and the second touch screen may be that the first touch screen is capacitively coupled to the second touch screen through capacitive coupling with the at least one external conductive object. For example, the first touch screen and the second touch screen 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, and the first touch screen in the communication mode The first conductive strip and/or the second conductive strip are in communication with the second touch screen being accessed 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 screen of the transmission end. The coded signal or packet sends a transmission request, and the touch screen as the receiving end responds to the transmission confirmation by the signal or the packet after receiving and confirming the transmission request, and the touch screen of the transmitting end can transmit the data to the receiving end, and those skilled in the art can infer other Serial communication protocol.

When the two touch screens are close to or in contact with each other, a touch screen can confirm the presence of the other touch screen by providing a driving signal to the conductive strip and detecting the signal of the conductive strip, thereby performing electricity Volume communication. In an example of the present invention, the driving signal may be provided by a first touch screen. If a second touch screen is in contact with the first touch screen or within a predetermined distance, the signal of the conductive strip of the first touch screen is relatively smaller than the second The signal of the conductive strip of the first touch screen when the touch screen 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 screen is also capacitively coupled by the driving signal of the first touch screen, and the conductive strip for detecting the second touch screen can also be informed that capacitive communication can be performed.

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 transmission strips of the first touch screen is provided with a driving signal, a first strip or a first group of receiving strips of the second touch screen are capacitively coupled, and the controller of the second touch screen When detecting the signals of the respective conductive strips, the conductive strips that are capacitively coupled can be determined. In this case, the second touch screen may select one or more conductive strips as a second strip or a second group of conductive strips in addition to the first strip or the first group of receiving strips, and provide a driving signal. Similarly, the first touch screen 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 screen. In other words, the capacitive communication of the touch screen provided by the present invention may be simplex or full duplex. Since the touch screens are not necessarily aligned flat when placed face to face, and the size of the first touch screen and the second touch screen or the number of conductive strips are not necessarily the same, the capacitive communication of the touch screen provided by the present invention can be applied to misaligned or different sizes or conductive. A different number of touch screens.

In the communication of the touch screen of the present invention, including but not limited to, simplex, half duplex and full duplex. The capacitive coupling between the first touch screen and the second touch screen is a direct capacitive coupling of the first touch screen and the second touch screen, wherein the first touch screen and the second touch screen face each other include a first area and a second area, a touch screen and a second touch screen are transmitted through Capacitive coupling of a region to a second region for half-duplex or full-duplex transmission. In an example of the present invention, the first touch screen and the second touch screen respectively have a plurality of conductive strips, and the conductive strips of the first touch screen in the first area and the conductive strips of the second touch screen in the second area do not overlap.

The one or more transmission conductive strips and the one or more receiving conductive strips corresponding to the first touch screen and the second touch screen may be referred to as a group of communication conductive strips. In other words, the capacitive communication of the touch screen 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 screen may first detect a portion where the hand approaches or covers the touch screen, 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 full-screen driving. Similarly, the second touch screen may also detect a portion of the conductive medium that approaches or covers the touch screen, and receives signals from one or more conductive strips covered by the conductive medium.

A person skilled in the art can deduce that the capacitive communication of the touch screen provided by the present invention 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 screens are not limited to handheld devices. In addition, the aforementioned touch screen is not limited to a projected capacitive touch screen, and may be a surface capacitive touch screen, a resistive touch screen, or the like. For example, the aforementioned first touch screen for communication is a surface type The capacitive touch screen, and the second touch screen is a projected capacitive touch screen.

Please refer to FIG. 7 , which is a schematic diagram of communication performed by a touch screen according to a seventh embodiment of the present invention, which is an optimal mode. While the capacitive touch screen is provided with the driving signal, the ground potential of the first touch screen 71 is provided to the at least one conductive strip 73 of the first touch screen 71, and the ground potential of the second touch screen 72 is provided to the at least one conductive layer of the second touch screen 72. The strip 74 is such that the first touch screen 71 is capacitively coupled to the conductive strip of the second touch screen 72 that is provided with a ground potential, thereby reducing the difference in potential between the first touch screen and the second touch screen.

For example, the conductive strips of the first touch screen aligned toward the first direction are supplied with drive signals, and the conductive strips facing the second direction are provided with a ground potential, and the conductive strips of the second touch screen oriented toward the first direction are provided with a ground potential, and Conductive strips oriented in the second direction are used to detect the transmitted material. For another example, a plurality of consecutively arranged conductive strips of the first touch screen may be provided with drive signals, all other conductive strips being provided with a ground potential, and the second touch screen without the detected conductive strips being provided with a ground potential.

In a preferred mode of the invention, the first touch screen has the aforementioned shielded conductive strips, and the shielded conductive strips are 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 screen and the second touch screen are respectively provided with a ground potential during communication, and the first touch screen and the second touch screen are provided with a ground potential. At least a portion of the capacitive coupling is face to face to pull the ground potential between the first touch screen and the second touch screen. The capacitive coupling between the first touch screen and the second touch screen is a direct capacitive coupling of the first touch screen and the second touch screen, wherein the first touch screen and the second touch screen face each other include a first area and a second area. The first touch screen and the second touch screen are capacitively coupled through the first area and the second area Perform half-duplex or full-duplex transmission.

In a first example of the present invention, the first touch screen and the second touch screen 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, The first conductive strip is communicated in the first area and the second area, and the second conductive strip is provided with a ground potential in the detection mode.

In a second example of the present invention, the first touch screen and the second touch screen 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, Communicating in the first region with the second region is a second conductive strip, and the first conductive strip is provided with a ground potential in the detection mode.

In a third example of the present invention, the first touch screen and the second touch screen 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, And the first touch screen and the face-to-face area of the second touch screen further comprise a third area, wherein the first area communicates with the second area is a second conductive strip, and in the detecting mode, the second conductive strip of the third area is Provide ground potential.

In a fourth example of the present invention, the first touch screen and the second touch screen 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, Wherein in the communication mode, one of the first conductive strip and the second conductive strip 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, the present invention further provides a method for detecting a touch screen, and further includes performing an update determination to determine whether an update reference has been executed within a predetermined update time. The update reference is made when the update judgment indicates that the update of the reference is not performed beyond the scheduled update time.

Please refer to FIG. 8 , which is a block flow diagram of a method for detecting a touch screen according to an embodiment of the invention. First, as shown in step 800, a full screen drive detection is performed on the touch screen. Then, as shown in step 810, it is determined whether there is at least one external object approaching or touching the touch screen according to the detection result of the full-screen drive detection. As shown in step 820, when the full screen drive detection indicates that there is no at least one external object approaching or touching the touch screen, an update determination is performed to determine whether to update a reference during a predetermined update time. As shown in step 830, when the update determination indicates that the reference does not perform the update after the predetermined update time, the reference is updated according to a first 2D sensing information, wherein when the full-screen driving detection is performed for more than one predetermined detection time or continuously executed more than one When the predetermined number of detections has not detected that at least one external object approaches or touches the touch screen, the full screen drive detection indicates that there is no at least one external object approaching or touching the touch screen. Finally, after updating the benchmark, the full screen drive detection of step 800 is repeatedly performed.

When the full screen drive detection indicates that there is no at least one external object approaching or touching the touch screen, as shown in step 840, performing a 2D mutual capacitance detection to obtain the first 2D sensing information. Then, the update reference of step 830 is performed according to the first 2D sensing information.

When the update determination of step 820 indicates that the reference has performed an update within a predetermined update time, the full screen drive detection of step 800 is repeatedly performed.

Moreover, as shown in step 842, when the full-screen driving detection indicates that at least one external object approaches or touches the touch screen, performing 2D mutual capacitance detection to obtain a second 2D sensing information. Then, the position of the at least one external object is determined according to the second 2D sensing information, as shown in step 850. After determining the position of at least one external object, the full screen driving detection of step 800 is repeatedly performed.

Referring to FIG. 1A, the touch screen 120 includes a plurality of first conductive strips 140A and more. The second conductive strip 140B, and the full-screen driving detection includes: simultaneously providing a driving signal to all of the first conductive strips 140A; and simultaneously providing a driving signal to all of the first conductive strips 140A, for all the second conductive strips 140B The capacitively coupled signal is detected to obtain a 1D sensing information according to the signals of all the second conductive strips 140B; and determining whether there is at least one external object approaching or touching the touch screen 120 according to the 1D sensing information.

Furthermore, the 2D mutual capacitance detection includes: providing one driving signal to the different one or more conductive strips in the first conductive strip in turn; respectively, each of the different ones of the first conductive strips Or when the plurality of conductive strips are supplied with the driving signal, detecting signals of all the second conductive strips to obtain a 1D sense corresponding to the first conductive strips of the supplied driving signals according to the mutual capacitive coupling signals of all the second conductive strips Measuring information; and collecting each of the 1D sensing information corresponding to the first conductive strip to which the driving signal is supplied to generate the first 2D sensing information or the second 2D sensing information.

Referring to FIG. 1A and FIG. 1B, the present invention further provides a touch system including a touch screen 120 and a touch controller (ie, the aforementioned controller 160). The touch controller 160 performs the following operations: performing a full screen drive detection on the touch screen 120 to determine whether there is at least one external object approaching or touching the touch screen 120; when the full screen drive detection indicates that the at least one external object is not present or When the touch screen 120 is touched, an update determination is performed to determine whether a reference to update is performed during a predetermined update time; and when the update indicates that the reference does not perform an update after the predetermined update time, according to a first 2D sensing Information updates the benchmark.

Accordingly, the present invention further provides a touch controller 160 that performs a full screen drive detection on a touch screen 120 to determine whether there is at least one external object approaching or touching the touch screen 120; when the full screen drive is detected Displaying the absence of the at least one external object approaching or touching When the touch screen 120 is touched, an update determination is performed to determine whether to update a reference during a predetermined update time; and when the update indicates that the reference does not perform an update after the predetermined update time, according to a first 2D sensing information Update the benchmark. The remaining relevant details have been disclosed in the above description and will not be described again here.

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.

800-850‧‧ steps

Claims (21)

A method for detecting a touch screen includes: performing a full-screen driving detection on the touch screen to determine whether at least one external object approaches or touches the touch screen; and when the full-screen driving detection indicates that the at least one external object is not present or When the touch screen is touched, an update determination is performed to determine whether to update a reference during a predetermined update time; and when the update determines that the reference exceeds the predetermined update time, the update is not performed, according to a first 2D sense The test information updates the benchmark. According to the detecting method of claim 1, wherein the full-screen driving detection is performed for more than one predetermined detection time or continuously for more than one predetermined detection number, the presence or absence of the at least one external object is not detected. In the touch screen, the full screen drive detection display does not exist that the at least one external object approaches or touches the touch screen. According to the detecting method of claim 1, wherein the full screen driving detection is repeatedly performed after updating the reference. The detecting method of claim 1, wherein the full screen driving detection is repeatedly performed when the update judgment indicates that the reference has performed an update during the predetermined update time. According to the detection method of item 1 of the scope of application for patents, it further includes: When the full-screen driving detection indicates that at least one external object approaches or touches the touch screen, performing a 2D mutual capacitance detection to obtain a second 2D sensing information, to determine the second 2D sensing information according to the second 2D sensing information. At least one location of the external object; and repeating the full screen drive detection. According to the detecting method of claim 1, wherein the touch screen comprises a plurality of first conductive strips and a plurality of second conductive strips, and the full screen driving detection comprises: simultaneously providing a driving signal to all the first conductive strips Simultaneously providing a driving signal to all of the first conductive strips, detecting mutual capacitive coupling signals of all the second conductive strips to obtain a 1D sensing information according to signals of all the second conductive strips; and according to the 1D The sensing information determines whether there is at least one external object approaching or touching the touch screen. The detecting method of claim 1, wherein the touch screen comprises a plurality of first conductive strips and a plurality of second conductive strips, and when the full screen driving detection indicates that there is no at least one external object approaching or touching the touch screen Performing a 2D mutual capacitance detection to obtain the first 2D sensing information, wherein the first 2D mutual capacitance detection comprises: providing a driving signal in a different one of the first conductive strips in turn or 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 produces a 1D sensed information corresponding to the first conductive strip to which the drive signal is provided; Each of the 1D sensing information corresponding to the first conductive strip to which the driving signal is supplied is collected to generate the first 2D sensing information. Touching the controller to perform a full screen driving detection on a touch screen to determine whether there is at least one external object approaching or touching the touch screen; when the full screen driving detection indicates that the at least one external object is not present Or when the touch screen is touched, an update determination is performed to determine whether to update a reference during a predetermined update time; and when the update determines that the reference exceeds the predetermined update time and the update is not performed, according to a first 2D Sensing information updates the benchmark. According to the touch controller of claim 8, wherein the full-screen drive detection is performed for more than a predetermined detection time or continuously for more than a predetermined number of detections, the presence or absence of the at least one external object is not detected. When the touch screen is touched, the full screen drive detects that there is no such at least one external object approaching or touching the touch screen. The touch controller according to item 8 of the patent application scope, wherein the full screen drive detection is repeatedly performed after updating the reference. The touch controller according to item 8 of the patent application scope, wherein the full screen drive detection is repeatedly performed when the update judgment indicates that the reference has performed an update during the predetermined update time. According to the touch controller of the eighth application patent, the following operations are further performed: when the full-screen drive detection indicates that at least one external object approaches or touches the touch screen, performing a 2D mutual capacitance detection to obtain a first The second 2D sensing information is used to determine the position of the at least one external object according to the second 2D sensing information; and repeatedly perform the full screen driving detection. The touch controller according to claim 8 , wherein the touch screen comprises a plurality of first conductive strips and a plurality of second conductive strips, and the full screen driving detection comprises: simultaneously providing a driving signal to all of the first conductive lines While providing a driving signal to all of the first conductive strips, detecting mutual capacitive coupling signals of all the second conductive strips to obtain a 1D sensing information according to signals of all the second conductive strips; The 1D sensing information determines whether there is at least one external object approaching or touching the touch screen. The touch controller according to claim 8 , wherein the touch screen comprises a plurality of first conductive strips and a plurality of second conductive strips, and when the full screen driving detection indicates that there is no at least one external object approaching or touching the During the touch screen, performing a 2D mutual capacitance detection to obtain the first 2D sensing information, wherein the first 2D mutual capacitance detection comprises: providing a driving signal in a different one of the first conductive strips in turn Or a plurality of conductive strips; respectively, when each of the one or more conductive strips in the first conductive strip is provided with a driving signal, detecting signals of all the second conductive strips to obtain all the second conductive strips Mutual capacitance The coupling signal generates a 1D sensing information corresponding to the first conductive strip to which the driving signal is supplied; and collecting 1D sensing information corresponding to each of the first conductive strips to which the driving signal is supplied to generate the first 2D sensing information . a touch system comprising: a touch screen; and a touch controller, performing: performing a full screen drive detection on the touch screen to determine whether there is at least one external object approaching or touching the touch screen; when the full screen drive Detecting that there is no presence of the at least one external object approaching or touching the touch screen, performing an update determination to determine whether to update a reference during a predetermined update time; and when the update determination indicates that the reference exceeds the predetermined update When the time is not updated, the reference is updated based on a first 2D sensing information. According to the touch system of claim 15 , when the full-screen drive detection is performed for more than a predetermined detection time or continuously for more than one predetermined detection number, the presence or absence of the at least one external object is not detected. In the touch screen, the full screen drive detection display does not exist that the at least one external object approaches or touches the touch screen. According to the touch system of claim 15, wherein the full screen drive detection is repeatedly performed after updating the reference. According to the touch system of claim 15, wherein the update judges that the reference has performed an update during the predetermined update time, the full screen drive detection is repeatedly performed. According to the touch system of claim 15, wherein the touch controller further performs the following operations: when the full screen drive detection indicates that at least one external object approaches or touches the touch screen, performing a 2D mutual capacitance detection The second 2D sensing information is obtained to determine the position of the at least one external object according to the second 2D sensing information; and the full screen driving detection is repeatedly performed. The touch system of claim 15 , wherein the touch screen comprises a plurality of first conductive strips and a plurality of second conductive strips, and the full screen driving detection comprises: simultaneously providing a driving signal to all of the first conductive strips Simultaneously providing a driving signal to all of the first conductive strips, detecting mutual capacitive coupling signals of all the second conductive strips to obtain a 1D sensing information according to signals of all the second conductive strips; and according to the 1D The sensing information determines whether there is at least one external object approaching or touching the touch screen. The touch system of claim 15, wherein the touch screen comprises a plurality of first conductive strips and a plurality of second conductive strips, and when the full screen drive detects that there is no at least one external object When the touch screen is touched or touched, performing a 2D mutual capacitance detection to obtain the first 2D sensing information, wherein the first 2D mutual capacitance detection comprises: providing a driving signal to the first conductive strip in turn Different one or more conductive strips; detecting a signal of all the second conductive strips to obtain a basis for each of the different one or more conductive strips in the first conductive strip a mutual capacitive coupling signal of the second conductive strip generates a 1D sensing information corresponding to the first conductive strip to which the driving signal is supplied; and a set of 1D sensing information corresponding to each of the first conductive strips to which the driving signal is supplied The first 2D sensing information is generated.