TW201409329A - Capacitive touch screen - Google Patents

Abstract

The present invention provides a mutual capacitive multi-touch screen. The conductive strip pattern allows that, when a touch range of each external conductive object on the mutual capacitive multi-touch screen is larger than a predetermined condition, capacitive coupling between each external conductive object and first conductive strip is greater than capacitive coupling between each external conductive object and second conductive strip, such that the proportion of a driving signal flowing out of the first conductive strip via at least one first external conductive object in the external conductive objects and into the second conductive strip via at least one second external conductive object in the external conductive objects decreases as the number of second external conductive objects increases.

Description

Capacitive touch screen

The present invention relates to a capacitive touch screen, and more particularly to a capacitive touch screen that reduces the effects of negative touch.

Referring to FIG. 1A, when the driving signal D passes through a driven conductive strip, the signal I may flow from the first finger A of the same hand to the second finger B, resulting in scanning the sensing information SI. Corresponding to the sensed coupling strips of the first finger A and the second finger B, the mutual capacitive coupling signal changes are sensed, as indicated by the touch-related sensing information SA and SB, respectively. It can be seen from the first A diagram that the change of the touch-related sensing information SA and the SB is reversed, that is, the signals are opposite.

The touch-related sensing information SA represents a change in the capacitive coupling corresponding to the intersection of the sensed conductive strip and the driven conductive strip where the first finger A is located, and there is a real touch. Similarly, the touch-related sensing information SB represents a change in the capacitive coupling corresponding to the intersection of the sensed conductive strip and the driven conductive strip where the second finger B is located, however, the touch-related sensing information SB represents The intersection area was not touched, and the unreal touch, phantom touch, was misjudged. In the following description, the capacitive flow of the first finger A flows out The signal of the conductive strip is referred to as a positive touch signal, and the signal flowing into the conductive strip due to the capacitive coupling of the second finger B is referred to as a negative touch signal. Therefore, the capacitive coupling change corresponding to the positive touch signal and the negative touch signal detected by the conductive strip is the touch-related sensing information of the positive touch and the touch-related sensing information of the negative touch, respectively.

Referring to FIG. 1B, when the first finger A and the second finger B are located on the same or the same sensed conductive strip, the corresponding touch-related sensing information SA and SB are mutually canceled due to the opposite signals, so that The signal becomes smaller. When the touch-related sensing information SA and the SB intensity are close, the signal may be too small to be read out. In the following description, the case where the negative contact signal is adjacent to the positive touch signal and the detected capacitive coupling change amount of the positive touch is distorted is called a negative touch effect.

In the above example, the first finger A and the second finger B are capacitively coupled to the conductive strip via an insulating surface layer, and the thinner the insulating surface layer, the greater the negative touch effect. That is, the detected capacitive coupling variation of the positive touch is more severely distorted. In addition, the greater the number of second fingers B that cause a negative touch, the greater the total amount of negative touch signals, the more severe the distortion of the detected capacitive coupling changes, and even the touch that would otherwise be touched. The touch-related sensing information is presented as a touch-sensitive sensing information of a negative touch. In other words, in the worst case, all second fingers B and one first finger A are located in the same detected electrode strips, and the negative touch effect is maximum. Obviously, in the case of mutual capacitance detection, the tolerance of the negative touch effect determines whether the position of the positive touch and the number of positive touch positions that can be detected simultaneously can be correctly detected.

The negative touch effect described above is more severe on portable devices because the ground of the portable device system is different from the human body. Due to the market demand, portable devices are required to be thinner and thinner, so capacitive touch screens are also required to be thinner and thinner. Capacitive touch screens are often placed on the display. The noise from the display will constantly interfere with the capacitive touch screen. The most direct method is to add a layer of back shield on the back of the capacitive touch screen (near the display). Layer), a ground potential is applied to the back shield to isolate the noise from the display. However, the increase of the back shield layer will inevitably increase the thickness of the capacitive touch screen, which is difficult to meet the market demand.

In order to reduce the interference of noise transmitted from the display without increasing the back shield layer, the most commonly used technique is to provide a conductive strip for driving signals in a two-layer structure (DITO; double ITO). The driven conductive strip is placed in the lower layer, and the sensed conductive strip is placed on the upper layer, wherein the driven conductive strip covers most of the display, and the ground potential is provided except for the conductive strip provided with the driving signal. , producing an effect similar to the back shield layer. Since the sensed conductive strip is on the upper layer, the thickness of the insulating surface layer cannot be effectively thinned in order to reduce the negative touch effect. When the insulating surface layer is made of glass, the sensed conductive strip needs to be kept at about 1.1 mm or more between the fingers. Even if a plastic material is used to fit the glass for support, the sensed conductive strip needs to be kept at about 0.7 mm or more between the fingers. In the case where the thickness of the insulating surface layer is so severely limited, only the gap between the driven conductive strip and the sensed conductive strip can be reduced. The thickness of the insulating interposer.

Compared with the double-layer structure, the insulating layer of the single-layer structure (SITO; single ITO) also has the same thickness limit of the insulating surface layer, but since there is no insulating interposer, the overall thickness is much thinner than the double-layer structure, but the above is also lost. Similar to the effect of the back shield layer. If the interference of the noise transmitted from the display cannot be effectively reduced, the single layer structure is more suitable to be disposed in the display (In cell). If you want to be placed above the display, the back shield layer may become a necessary choice.

The interference of the noise transmitted by the display reduces the ability to determine the position of the positive touch, while the negative touch effect affects the ability to determine the position of multiple positive touches. Obviously, to reduce the thickness of the capacitive touch screen, it may be necessary to consider the distance between the sensed conductive strip and the finger, and may even consider how to resist the interference of the noise transmitted from the display.

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

When performing multi-touch detection on a mutual capacitive multi-touch screen, the drive signal may be capacitively coupled through the first hand in the palm of the hand. Refers to the flow of the second finger, which may reduce the amount of signal or signal change used to indicate the position of the positive touch, resulting in a false positive of the positive touch. The purpose of the negative touch is to reduce the negative touch effect of the flow between the fingers.

Capacitive coupling of signals flowing between multiple external conductive objects into mutual capacitance when performing multi-touch mutual-multiple touch detection in a mutual capacitive multi-touch screen The multi-touch screen may cause severe distortion of the capacitive coupling change of the detected positive touch. To avoid this problem, the thickness of the insulating surface layer cannot be effectively thinned.

Therefore, the object of the present invention is to make the capacitive coupling between the driven conductive strip and the external conductive object larger than the capacitive coupling of the detected conductive strip and the external conductive object by the conductive strip of the mutual capacitive multi-touch screen. The ratio of the driving signal flowing out of the conductive strip through the capacitive coupling of the plurality of external conductive objects through the insulating surface and then flowing into the detected conductive strip. Thereby, the negative touch effect can be reduced, and as the negative touch signal is lowered, the thickness of the insulating surface layer can be made thinner.

In addition, by presenting the capacitive coupling signal provided by the detected conductive strip in a difference or double difference manner, the noise interference from the back display is effectively reduced. Eliminating the setting of the back shield layer can further reduce the thickness of the mutual capacitive multi-touch screen. Wherein, the capacitive coupling signal provided by the detected conductive strip is presented in a double difference manner, which can simultaneously reduce the signal distortion caused by the compression deformation.

In a mutual capacitance type multi-touch screen proposed by the present invention, the conductive strips cause the contact range of the effective touch to be detected at the correct position to cover the exposed area of the shielding pattern larger than the exposed area of the detected conductive strip. Or greater than the exposed area of the conductive strip state, or the contact range covers the exposed conductive area of the shielded conductive strip and the driven conductive strip is larger than the area of the conductive strip to be detected. Therefore, when the driving signal flows out of the conductive strip through the capacitive coupling of the plurality of external conductive members through the insulating surface and then flows into the conductive strip, the influence of the signal flowing into the detected conductive strip on the position detection can be relatively reduced.

In another mutual capacitance type multi-touch screen proposed by the present invention, the driven conductive strip is separated from the external conductive object by a distance larger than the distance of the detected conductive strip from the external conductive object, so that the driven conductive strip and the external conductive object are driven. The capacitive coupling is greater than the capacitive coupling of the detected conductive strip. Therefore, when the driving signal flows out of the conductive strip through the capacitive coupling of the plurality of external conductive members through the insulating surface and then flows into the conductive strip, the influence of the signal flowing into the detected conductive strip on the position detection can be relatively reduced.

Obviously, in the aforementioned mutual capacitance type multi-touch screen, the driven conductive strips may be closer to the outer conductive objects than the detected conductive strips, and the exposed area is larger, which has the advantages of both.

The object of the present invention and solving the technical problems thereof are achieved by the following technical solutions. A method for detecting a capacitive touch screen according to the present invention includes: providing a capacitive touch screen having a rectangular shape with opposite long sides and opposite short sides, including: for mutual capacitance detection operation a plurality of first conductive strips that are provided with a driving signal, wherein each of the first conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of first conductive sheets, and each of the first conductive sheets is squared Or each of the four sides of the diamond protrudes an extension piece, wherein the first conductive strip is parallel to the short side; and a plurality of second conductive strips providing a mutual capacitive coupling signal, wherein each of the second conductive strips is plural The second connecting line is composed of a plurality of second conductive sheets, and each of the second conductive sheets is recessed by a recessed space on each side of the square or the four sides of the diamond, wherein the second conductive strip is parallel to the long side; And providing the drive signal, and receiving the mutual capacitive coupling signal by the second conductive strip when the at least one conductive strip is provided with the drive signal; wherein the first A second electrically conductive strip and the strip is exposed and separated from each other, and each said recess accommodating space extending one sheet. First conductive strip second conductive strip

The object of the present invention and solving the technical problems thereof are also achieved by the following technical solutions. According to the present invention, a device with a capacitive touch screen for detecting proximity or touch of an external conductive object includes: a capacitive touch screen: operatively provided with a driving signal for mutual capacitance detection a plurality of first conductive strips, wherein each of the first conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of first conductive sheets, and each of the first conductive strips is surrounded by four sides of a square or a diamond Extending an extension piece; and providing a plurality of second conductive strips providing mutual capacitive coupling signals, wherein each of the second conductive strips is composed of a plurality of second connecting lines connected in series with a plurality of second conductive sheets, and each of the first conductive strips The two conductive sheets are recessed by a recessed space on each side of the square or the four sides of the diamond; and a control circuit for providing the driving signal and receiving the second conductive strip when the at least one conductive strip is supplied with the driving signal a mutual capacitive coupling signal; wherein the first conductive strip and the second conductive strip are exposed and separated from each other, and each recessed space accommodates one of the extension sheets.

The object of the present invention and solving the technical problems thereof are also achieved by the following technical solutions. According to the present invention, a capacitive touch screen for detecting proximity or touch of an external conductive object includes: a plurality of first conductive strips operatively provided with a driving signal for mutual capacitance detection, Each of the first conductive strips is composed of a plurality of first connecting wires connected in series with a plurality of first conductive sheets, and each of the first conductive strips protrudes from each of four sides of a square or a diamond shape; and provides mutual a plurality of second conductive strips of the capacitively coupled signal, wherein each of the second conductive strips is composed of a plurality of second connecting lines connected in series with a plurality of second conductive sheets, and each of the second conductive sheets is square or diamond shaped Each of the four sides is recessed into a recessed space; wherein the first conductive strip and the second conductive strip are exposed and separated from each other, and each recessed space accommodates one of the extension sheets. First conductive strip second conductive strip

External conductors that are supplied to the conductive strips in the prior art The more the pieces, the larger the negative touch effect, and the more the outer conductive articles provided to the conductive strips in the disclosed technical solution, the smaller the negative touch effect, contrary to the prior art. It also means that the tolerance for the virtual touch effect is higher, and the thickness of the insulating surface layer can also be thinner.

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. 1C , the present invention provides a position detecting device 100 , which includes a sensing device 120 and a driving/detecting unit 130 . The sensing device 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. Drive/detect unit The 130 generates a sensing information based on 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 driven is detected. In addition, the sensing device 120 may be disposed on the display 110. The sensing device 120 and the display 110 may be configured with a shielding layer (not shown) or a back shield layer. In a preferred embodiment of the present invention, in order to make the thickness of the sensing device 120 thinner, the back shield layer is not disposed between the sensing device 120 and the display 110.

The first conductive strip and the second conductive strip may be a plurality of row conductive strips and column conductive strips arranged in rows or columns, or may be a plurality of first dimensional conductive strips arranged in a first dimension and a second dimension. The two-dimensional conductive strip is a plurality of first-axis conductive strips and second-axis conductive strips arranged along the first axis and the second axis. In addition, the first conductive strip and the second conductive strip may overlap each other orthogonally or may be non-orthogonally overlapped. For example, in a polar coordinate system, one of the first conductive strips or the second conductive strips may be radially arranged, and the other of the first conductive strips or the second conductive strips may be annularly arranged. Furthermore, one of the first conductive strips or the second conductive strips may be a driving conductive strip, and the other of the first conductive strips or the second conductive strips may be a detecting conductive strip. The "first dimension" and "second dimension", "first axis" and "second axis", "drive" and "detect", "driven" and "detected" conductive strips are available The foregoing "first" and "second" conductive strips are included, including but not limited to constituting orthogonal grids, and may also constitute other The first dimension intersects the second dimension to intersect the geometric configurations of the conductive strips.

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

In another example of the present invention, the controller 160 includes a transmission interface with the host 170, and the control unit transmits the data to the host through the transmission interface. Those skilled in the art may infer that the transmission interface includes but is not limited to UART, USB, Various wired or wireless transmission interfaces such as I2C, Bluetooth, WiFi, and IR. In 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. Wait. 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.

In the overlapping area of each of the conductive strips, the upper and lower conductive strips form two poles. Each overlapping area can be regarded as a pixel in an image, and when one or more external conductive objects are approached or touched, the image can be regarded as a captured image (such as a finger). Touch the pattern of the sensing device).

When a driven conductive strip is provided with a drive signal, the driven conductive strip itself constitutes a self capacitance, and each overlap region on the driven conductive strip constitutes a mutual capacitance. The self-capacitance detection described above is to detect the self-capacitance of all the conductive strips, and is particularly suitable for judging the proximity or contact of a single external conductive object.

In the foregoing mutual capacitance detection, when all the driven conductive strips are provided with a driving signal, all the tested conductive strips arranged in different dimensions from the driven conductive strips detect the electrical power of all overlapping regions on the driving conductive strip. The amount of capacitance or capacitance change to be considered as a column of pixels in the image. Accordingly, the pixels of all the columns are combined to constitute the image. When one or more external conductive objects are approaching or touching, the image can be regarded as a captured image, and is particularly suitable for judging the proximity or contact of a plurality of external conductive objects.

Referring to FIG. 1E, a pattern of a capacitive touch sensor 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 (ITTO). 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 the example of the present invention, the longitudinal direction is the first direction and the lateral direction is 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.

1F is a cross-sectional view of FIG. 1E, 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 part of the first conductive strip (including the first The connecting line 15) is insulated from the 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.

1G is a cross-sectional view of the double-layer capacitive touch sensor of FIG. Parts (including the second connecting line 12), the insulating layer 18, and a portion of the first conductive strip (including the conductive sheet 14, the first connecting line 15, the conductive sheet 16) and the insulating surface layer 19.

1H is a cross-sectional view of a portion of the capacitive touch sensor of FIG. Parts (including the second connecting line 12), the insulating layer 18, and a portion of the first conductive strip (including the conductive sheet 14, the first connecting line 15, the conductive sheet 16) and the insulating surface layer 19. 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.

Referring to FIG. 1A, the touch-related sensing information SA presents a change in mutual capacitive coupling between the first finger A and the driven conductive strip and the sensed conductive strip. The touch-related sensing information SB presents a change in the mutual capacitive coupling between the second finger B and the sensed conductive strip.

Since the first finger A and the second finger B of the same palm approach or touch the sensed conductive strip at the same time, the signal of the positive touch may be offset by the opposite signal flowing between the fingers, as shown in FIG. 1B, to solve this problem. The most straightforward way to solve this problem is to reduce the signal flowing between the fingers to the sensed strip. The degree of capacitive coupling is That is, the degree C of capacitive coupling is proportional to the area A of the capacitive coupling, and the distance d of the capacitive coupling is inversely proportional.

Since the finger and the sensed conductive strip are separated by an insulating surface layer, one of the ways to reduce the signal flowing between the fingers to the sensed conductive strip is to increase the thickness of the insulating surface insulating surface layer. In an example of the present invention, the insulating skin layer may be a skin glass having a suitable thickness of 1.1 mm or more.

However, as the portable device is more and more stressed, the thickness of the surface glass is also required to be thinner and thinner. In an example of the present invention, the required insulating surface insulating surface thickness may be less than 0.7 mm, so In one example of the invention, the other way to reduce the signal flowing between the fingers to the sensed strip is to reduce the exposed area of the strip being sensed.

Referring to FIG. 2A, the first finger and the second finger of the human body are in contact with the first contact area P1 and the second contact area P2 of the capacitive touch screen, and the first contact area P1 covers the first conductive strip Tx1 and the second conductive strip Rx1. Overlapping area and second connection The contact region P2 covers the overlapping region of the first conductive strip Tx2 and the second conductive strip Rx2. When the first conductive strip Tx1 is supplied with a driving signal SD, the remaining first conductive strips including the first conductive strip Tx2 are supplied with a direct current signal, and each of the second conductive strips is respectively detected. In an example of the present invention, the second conductive strip that has not been detected may be provided with a DC signal. The DC signal may be provided by a ground circuit or a circuit for maintaining a DC signal. Therefore, in the present invention, the circuit coupled to the ground circuit or the DC signal may be supplied with a DC signal, such as a grounded circuit or a grounded conductive. article. Similarly, a circuit coupled to provide a drive signal can be considered to be provided with a drive signal as a driven circuit, such as a driven conductive strip. In addition, the driving signal SD may be simultaneously supplied to the plurality of first conductive strips. In a preferred example of the present invention, it may be an adjacent plurality of conductive strips, such as two or three conductive strips. Simultaneously driving some of the conductive strips can adaptively control (enhance) the signal detected by the detected conductive strips, and can reduce the moisture attached to the insulating surface during self-capacitance detection. Or the effect of conductive particles.

In the illustration, when the driving signal SD is supplied to the first conductive strip Tx1, the finger contacting the first contact region P1 is a positive touch, and when the driving signal SD is supplied to the first conductive strip Tx2, contacting the second contact region The finger of P2 is a positive touch. Likewise, a finger that causes a negative touch will also change as the drive signal SD is provided to a different first conductive strip. For convenience of explanation, in the following description, the finger that is touching is used as the first finger, and the finger that causes the negative touch effect is the second finger.

Accordingly, the capacitive coupling amount formed in the first contact region P1 includes: a capacitive coupling amount Ctr1 between the first conductive strip Tx1 and the second conductive strip Rx1, the first conductive strip Tx1 and the first finger H1 The capacitive coupling amount Cht1, the capacitive coupling amount Chr1 between the second conductive strip Rx1 and the first finger H1. Similarly, the capacitive coupling amount formed in the second contact region P2 includes: a capacitive coupling amount Ctr2 between the first conductive strip Tx2 and the second conductive strip Rx2, a first conductive strip Tx2 and a second finger H2 The capacitive coupling amount Cht2, the capacitive coupling amount Chr2 between the second conductive strip Rx2 and the second finger H2.

In addition, there is a capacitive coupling amount Chg between the body and the device to which the first finger H1 and the second finger H2 are connected, and the value is generally between 10 pf and 250 pF, wherein the signal flowing through is Sg.

Therefore, when the driving signal SD is supplied to the one or more first conductive strips Tx1, each of the second conductive strips and the first conductive strip Tx1 can be represented or obtained by detecting the signal of each of the second conductive strips. The amount of signal or signal change in the overlapping layers (relative to the amount of signal change in the signal when not in contact). Similarly, the signal or signal variation of all the overlapping regions can be represented or obtained by providing the driving signal SD to the other first conductive strips. For example, by sensing the signals Sr1 and Sr2 by the second conductive strips Rx1 and Rx2, respectively, the amount of capacitive coupling on the overlap region can be represented, and the signal can be obtained compared with the amount of capacitive coupling when the in-phase overlap region is not in contact. The amount of change. Thus, when an external conductive object (e.g., a finger) is in contact, the position or position of contact can be indicated by the amount or amount of capacitive coupling of the overlapping regions. although The first finger H1 and the second finger H2 are capacitively coupled to a first conductive strip and a second conductive strip, respectively, and those skilled in the art can infer that each finger can be capacitively coupled. Strips.

The driving signal SD does not simply flow out of the signal Sr1, and it is possible to flow from the conductive strip to the external conductive object to become the signal S1, such as by the conductive strip to capacitively flow out to the first finger H1. All or part of the signal S1 becomes the signal Sg is capacitively coupled to the ground or the ground by the external conductive object, wherein a part of the signal S1 may become the signal S2 flowing through the external conductive object to capacitively flow to the conductive strip For example, the flow to the second conductive strip becomes the signal Sr2 or / and flows to the first conductive strip to which the DC signal is supplied.

Therefore, not only the change of the capacitive coupling representing the overlapping region of the first conductive strip Tx1 and the second conductive strip Rx1 but also the first conductive strip Tx1 and the second conductive strip Rx2 can be detected. The change in capacitive coupling of the overlapping regions. Since there is no actual capacitive coupling on the overlapping region of the first conductive strip Tx1 and the second conductive strip Rx2, the detected signal indicates a change in capacitive coupling, which constitutes a non-existent negative touch. And because the signal flows from the first finger H1 to the second finger H2, so that the signals detected by the second conductive strips Rx1 and Rx2 are opposite, when the true contact signal Sr1 detected by the second conductive strip Rx1 is viewed When the signal is a positive touch, the signal Sr2 that the second conductive strip Rx2 detects the false contact can be regarded as a negative touch signal. If the first contact region P1 and the second contact region P2 correspond to the second conductive strip or the first contact region When P1 and the second contact area P2 are expanded to the same second conductive strip, the signals of the positive touch and the negative touch may cause each other to cancel each other, and the signal of the positive touch may be too small to be detected. The more the number of negative touches, the more obvious this situation is, and it is even possible to cancel the signal of the positive touch to become the signal of the negative touch. In the impedance/capacitance analysis, the capacitance of the circuit to which the DC signal is supplied in the second contact region P2 is Chg+Cht2 (the first conductive strip Tx2 is supplied with a DC signal when the first conductive strip Tx1 is supplied with the driving signal ( For example, grounding)), the negative touch signal and the second conductive strip Rx2 have a capacitance of Chr2. Therefore, the ratio of negative touch to positive touch GTR = (Chr2) / (Chg + Cht2). The smaller the ratio GTR of the negative touch and the positive touch, the smaller the effect of the negative touch signal and the positive touch signal. To remove or reduce the effect of the negative touch signal on the positive touch, the area of the circuit to which the DC signal is supplied can be adjusted such that when the second finger H2 approaches or contacts, most of the contact range covers the DC signal being supplied. A circuit (such as a first conductive strip that is not provided with a drive signal).

To solve the problem of positive touch error caused by the cancellation of the positive and negative touch signals, the negative touch signal is reduced as much as possible. The most direct way is to increase the distance between the external conductive object and the second conductive strip. For example, increase the distance between the second finger H2 and the second conductive strip Rx2. In an example of the present invention, when the insulating surface layer is glass and the distance between the second finger H2 and the second conductive strip Rx2 is about 1.1 mm, the problem that the single positive touch and the single negative touch signal are cancelled can be effectively solved. However, when the problem is that a single positive touch is cancelled by multiple negative touch signals, it may be necessary to add a larger distance between the finger and the second conductive strip. Obviously, can The ability to tolerate the cancellation of the positive and negative touch signals without causing the positive touch position to be misjudged is limited by the distance between the finger and the second conductive strip, which is difficult to be less than 0.7 mm. Therefore, to minimize the negative touch signal, it is necessary to increase the distance between the finger and the second conductive strip as much as possible. However, this runs counter to the growing demand for capacitive touch screens on the market.

It can be known from the ratio GTR of the negative touch and the positive touch proposed by the present invention that GTR=(Chr2)/(Chg+Cht2), to reduce the influence of the cancellation of the signal of the positive touch and the negative touch (hereinafter referred to as the negative touch effect), It is necessary to reduce the capacitive coupling amount Chr2 between the second conductive strip and the finger, and/or to increase the capacitive coupling amount (Chg+Cht2) between the finger and the DC signal circuit.

According to this, in an example of the present invention, a plurality of first conductive strips of a conductive strip pattern and a plurality of second conductive strips overlap each other and are exposed to each other, and the exposed area of the first conductive strip is larger than The exposed area of the second conductive strip. In another example of the present invention, when the capacitive coupling range of an effective contact of the external conductive member approaching or contacting is large enough to be judged to be a position, the conductive strip pattern makes coverage or capacitive in the capacitive coupling range The area exposed to the first conductive strip is greater than the area covered or capacitively coupled to the second conductive strip. For example, the exposed area of the second conductive strip is less than half of the area exposed by the first conductive strip, and the capacitive coupling range is larger than the area of each of the overlapping regions. When the first conductive strip and the second conductive strip are filled or approach an active area of the capacitive touch screen, such a conductive strip pattern causes any of the overlapping areas to overlap The area of the capacitive contact that is effectively contacted or capacitively coupled to the first conductive strip is greater than the area covered or capacitively coupled to the second conductive strip.

The foregoing external conductive object causes an effective touch when the contact range is greater than a predetermined condition, wherein the effective touch can cause a signal or a signal change amount sufficient to determine the position, and the preset range may be a width (length), an area, etc. Wait. For example, the maximum or minimum width of the contact range is greater than a preset condition or the area is greater than a preset condition. Therefore, in a single layer structure, the capacitive coupling amount of the second finger H2 and the second conductive strip will be less than the capacitive coupling amount with the DC signal.

Further, in the two-layer structure, the first conductive strip is located on the upper layer, and the second conductive strip is located on the lower layer, that is, the first conductive strip is located on a layer closer to the outer conductive object. Therefore, when the contact range of the external conductive object to the capacitive touch screen is greater than a preset condition to form an effective touch, and the contact range covers the area of the first conductive strip is greater than or equal to the contact area covering the area of the second conductive strip, The capacitive coupling amount between the two fingers H2 and the second conductive strip will be less than the capacitive coupling amount with the DC signal circuit.

In the prior art, in the case where it is not ensured that the capacitive coupling amount of the second finger H2 and the second conductive strip is smaller than the capacitive coupling amount with the DC signal circuit, the number of the second finger H2 is increased by the two fingers H2 and The more the capacitive coupling of the second conductive strips flows into the second conductive strip.

Referring to FIG. 2B, a schematic diagram of the negative touch signal S2 flowing into the conductive strip, the impedance R in the figure indicates the impedance of the negative touch signal S2 before flowing into the conductive strip. Because the signal of the driving signal capacitively coupled to the first finger H1 forms a capacitive coupling Cr with the second conductive strip and a circuit that provides a DC signal via the second finger H2 (eg, the first conductive strip that is not provided with the driving signal) Capacitively coupling Cg to form a signal Ir flowing into the second conductive strip and a signal Ig flowing into the circuit to which the DC signal is supplied, respectively. Obviously, the driving signal is connected in parallel to the second conductive strip and the circuit providing the DC signal after being capacitively coupled to the first finger H1. When the second finger H2 is increased, the relative capacitive coupling of Cr and Cg is also increased. . If the amount of capacitive coupling Cr increases is greater than the amount of capacitive coupling Cg increases, since the resistance is inversely proportional to the capacitance, the signal Ir will increase and the signal Ig will decrease, ie, the negative touch effect increases.

Therefore, as the number of the second fingers H2 causing the negative touch increases, the distance between the second conductive strip and the second finger H2 must also be larger, and the thicker the insulating surface layer is, the tolerance of the negative touch effect can not be tolerated. A misjudgment that caused the position of the positive touch. However, the thickening of the insulating surface is contrary to the goal of thinning the capacitive touch screen.

Accordingly, in an example of the present invention, the technical means for reducing the negative touch effect is to adopt a conductive strip state. When the contact range of the effective touch is greater than the preset condition, the design of the conductive strip pattern is based on any greater than the pre-predetermined condition. The conditional contact range covers the exposed area of the first conductive strip necessarily greater than the exposed area of the second conductive strip. Therefore, as the number of second fingers H2 increases, the capacitive coupling Cg increases. The amount is greater than the amount by which the capacitive coupling Cr increases. Since the resistance is inversely proportional to the capacitance, the signal Ig will increase, and the signal Ir will decrease, that is, the negative touch effect will decrease.

In a preferred mode of the invention, the first conductive strip is on the upper layer of the two-layer structure and the second conductive strip is on the lower layer of the two-layer structure.

According to the above, in a mutual capacitive multi-touch screen provided in an example of the present invention, the conductive strips are in such a manner that when a contact range of each external conductive object to the mutual capacitive multi-touch screen is greater than a preset condition, The amount of each of the outer conductive members capacitively coupled to the first conductive strip is greater than the amount capacitively coupled to the second conductive strip such that the drive signal is at least one of the outer conductive members a ratio of an outer conductive member flowing out of the conductive strip and then flowing into the second conductive strip by at least one second outer conductive member of the outer conductive member, along with the second outer conductive member The number increases and decreases.

In the present invention, under the condition that the signal amount of the capacitive coupling out of the conductive strip is the same, the more the number of the second finger H2 is, the more the signal flows into the second conductive strip by the capacitive coupling of the two fingers H2 and the second conductive strip. less. Under this condition, the thickness of the insulating surface layer can be tolerated by the influence of a negative touch caused by a second finger H2, and is equivalent to the influence of a negative touch caused by a plurality of second fingers H2. The above-mentioned effect of tolerating negative touch means that when there is a negative touch caused by one or more second fingers H2, the position of each positive touch can still be correctly judged.

According to the above, when the capacitive touch screen is opaque, for example, as a touch screen of a notebook computer, the sensed conductive strip (such as the second conductive strip) is thinned, and the negative touch effect can also be reduced. However, if the sensed conductive strip is too sparse, when the finger is slanted straight, a series of coordinates representing the position of the finger may be a zigzag oblique line, and the more the configuration of the sensed conductive strip is sparse, the more serious the zigzag is.

In addition, when the capacitive touch screen is transparent (for example, when the display is formed with a touch sensitive display), in order to make the transmittance as uniform as possible, the wire strip on the capacitive touch screen needs to be evenly distributed as much as possible. An active area on the touch screen, such as shown in FIG. 1E. Although the conductive sheet in the figure is a diamond shape, those skilled in the art can infer that the conductive sheet can also be a polygon such as a hexagon, an octagon or the like, or other geometric figures.

Referring to FIG. 3A to FIG. 3D , a capacitive touch screen according to an example of the present invention is used to detect the proximity or touch of an external conductive object. The capacitive touch screen includes a plurality of first conductive strips 31 and a plurality of second conductive strips 32. The first conductive strips 31 and the second conductive strips 32 are exposed and separated from each other.

The first conductive strip 31 is operatively provided with a driving signal for mutual capacitance detection, wherein each of the first conductive strips 31 is connected to the plurality of first conductive sheets 33 by a plurality of first connecting lines 35. It is composed, and each piece of the first conductive sheet 33 is protruded by an extending piece 37 from each of four sides of a square or a diamond. In a preferred embodiment of the invention, the extension piece 37 is triangular, such that the first guide The electric piece 33 has a hexagonal shape. Those skilled in the art will recognize that the extension sheet 37 can also be rectangular, diamond shaped or other polygonal.

The second conductive strip 32 provides a mutual capacitive coupling signal, wherein each of the second conductive strips 32 is composed of a plurality of second connecting lines 36 connected in series with a plurality of second conductive sheets 34, and each of the second conductive strips 34 is a recessed space 38 recessed by each side of the square or diamond. Each of the recessed spaces 38 accommodates one of the extending pieces 37. In a preferred embodiment of the invention, the recessed space 38 is triangular such that the second conductive sheet 34 becomes a hexagonal shape. Those skilled in the art will recognize that the recessed space 38 can also be rectangular, diamond shaped or otherwise polygonal.

In a preferred mode of the present invention, the first conductive sheet 33 is a hexagonal shape formed by a square or diamond-shaped expansion of the extending piece 37, and the second conductive sheet 34 has a recessed space 38 square or diamond-shaped retraction. Hexagon.

The exposed space between the first conductive strip 31 and the second conductive strip 32 may be a plurality of isolated third conductive pads 39, and the conductive strips 39 and the first conductive strips 31 may be The same material. In addition, the conductive sheet 39 and the second conductive strip 32 may be the same material.

In an example of the present invention, the area of the first conductive sheet 33 removed from the extending sheet 37 is equal to the area of each of the second conductive sheets 34 plus the recessed space 38, so that the first conductive sheet 33 is exposed. The area is larger than the second conductivity The area of the sheet 34. In another example of the present invention, the area of the first conductive sheet 33 is less than the area of each of the second conductive sheets 34 plus the recessed space 38, so that the first conductive sheet 33 The exposed area is larger than the area of the second conductive sheet 34. In fact, the area of each of the first conductive sheets 33 that removes the extension sheet 37 and the area of each of the second conductive sheets 34 plus the recessed space 38 are about equal to or equal to each of the second conductive layers. The area of the third conductive sheet 39 around the sheet 34.

In addition, in an example of the present invention, the capacitive touch screen adopts a single layer structure (SITO; single ITO). The first conductive sheet 33 and the second conductive sheet 34 are in the same plane. Each of the first connecting lines 35 spans one of the second connecting lines 36 or each of the second connecting lines 36 across one of the first connecting lines 35, wherein the intersecting first connecting lines 35 are connected to the second Lines 36 are separated by an insulator (not shown).

In another example of the present invention, the capacitive touch screen is a two-layer structure (DITO; double ITO). The first conductive strip 33 and the second conductive strip 34 are not in the same plane, wherein the first conductive strip 33 is closer to the external conductive object than the second conductive strip 34.

In addition, in an example of the present invention, the first conductive sheet 33 and the second conductive sheet 34 do not include conductive sheets that are incomplete at both ends of the first conductive strip 31 and the second conductive strip 32. The first conductive strip 31 is respectively half of the first conductive strips, and also belongs to a part of the first conductive strip, and is connected to the first guide by the first connecting line 35. Electric film 33. Similarly, the two ends of the second conductive strip 32 are respectively a half second conductive sheet. Connected to the second conductive sheet 34 by the second connection line 36.

In another example of the present invention, the capacitive touch screen may further include two first side conductive strips respectively located on two sides of the first conductive strip and two second side conductive strips respectively located on the second conductive Two sides of the strip, wherein each of the first side conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of half sheets of first conductive sheets, and each of the second side conductive strips is composed of a plurality of second connecting lines A plurality of half-piece second conductive sheets are connected in series.

The aforementioned driving signal is an alternating current signal, which may be a sine wave (such as a sin wave) or a square wave (such as a PWM).

Referring to FIG. 4, in a preferred mode of the present invention, the capacitive touch screen 40 has a rectangular shape with opposite long sides 42 and opposite short sides 42, wherein the first conductive strip 31 and the short side 41 is parallel and the second conductive strip 32 is parallel to the long side 42. In other words, the capacitive touch screen has a rectangular shape with opposite long sides 42 and opposite two short sides 41, wherein the first conductive strips 31 are arranged in parallel with the two short sides 41 between the two short sides 41, and The second conductive strip 32 is arranged in parallel with the two long sides 42 between the two long sides 42. In an example of the invention, the number of first conductive strips 31 is greater than the number of second conductive strips 32. In other words, the number of first conductive strips 31 that are provided with drive signals is greater than the number of second conductive strips 32 that provide mutual capacitive coupling signals.

As previously described, the mutual capacitive coupling signal provided by the second conductive strip 32 can be provided to the controller 160, which can be an integrated circuit (IC). Control circuit 160 provides the drive signals described above and receives the mutual capacitive coupling signals by the second conductive strips 32 when at least one of the conductive strips 31 is provided with a drive signal. Accordingly, the present invention employs a controller 160 and a capacitive touch screen to form a device having a capacitive touch screen.

In an example of the invention, the mutual capacitive coupling signals are received simultaneously, requiring the same number of components to receive the mutual capacitive coupling signals. Connecting the second conductive strip 32 from the short side is preferred to connecting to the first conductive strip 31 from the long side because fewer capacitive elements can be used to receive the mutual capacitive coupling signal to obtain an image.

In another example of the present invention, the second conductive strips are arranged in parallel in sequence, and have N strips, N being a natural number, wherein the control circuit generates N-1 differences according to the mutual capacitive coupling signals, each A difference is generated by subtracting the mutual capacitive coupling signals of a pair of adjacent second conductive strips, respectively.

In another example of the present invention, the second conductive strips are arranged in parallel in sequence, and have N strips, N being a natural number, wherein the control circuit generates N-2 double differences according to the mutual capacitive coupling signals. Each double difference is based on the difference between the mutual capacitive coupling signal of the first two electrical two conductive strips of the three adjacent second conductive strips and the mutual capacitive coupling signal of the latter two electrical two conductive strips. Reduced to produce.

Since the adjacent conductive strips are equally affected by the noise from the display, the signal difference generated when the signals of the adjacent second conductive strips 32 are simultaneously received can cancel most of the noise interference from the display. Therefore, it is not necessary to add a layer of a shielding layer between the capacitive touch screens. When a general drive signal is provided, the back shield layer is provided with a constant current potential or the drive signal to mask noise from the display.

According to the foregoing, the present invention provides a method for detecting a capacitive touch screen for detecting proximity or touch of an external conductive object, as shown in FIG. First, as shown in step 510, the capacitive touch screen is provided in a rectangular shape with opposite long sides and opposite short sides. The capacitive touch screen includes a plurality of first conductive strips and a plurality of second conductive strips. The first conductive strip is operatively provided with a driving signal for mutual capacitance detection, wherein each of the first conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of first conductive sheets, and each A piece of the first conductive sheet protrudes from each of the sides of the square or the diamond by an extending piece, wherein the first conductive strip is parallel to the short side. The second conductive strip provides a mutual capacitive coupling signal, wherein each of the second conductive strips is composed of a plurality of second connecting lines connected in series with a plurality of second conductive sheets, and each of the second conductive strips is formed of a square or a diamond Each side of the four sides is recessed into a recessed space, wherein the second conductive strip is parallel to the long side. Next, as shown in step 520, a driving signal is supplied from the long side to the at least one first conductive strip, and when the at least one first conductive strip is supplied with the driving signal, the second conductive strip is received by the second conductive strip on the short side. Mutual capacitive coupling signal.

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.

A, B‧‧‧ fingers

D‧‧‧ drive signal

I‧‧‧ signal

SI‧‧‧ Sensing Information

SA, SB‧‧‧ Touch related sensing information

100‧‧‧Detection device

110‧‧‧ display

120‧‧‧Sensing device

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

SD‧‧‧ drive signal

P1‧‧‧ first contact area

P2‧‧‧Second Contact Area

H1‧‧‧first finger

H2‧‧‧ second finger

140A, Tx1, Tx2‧‧‧ first conductive strip

140B, Rx1, Rx2‧‧‧ second conductive strip

Sg‧‧‧Signal from the body to the ground

S1‧‧‧ Signals flowing out of the strip

S2‧‧‧ Signals flowing into the conductive strip

Sr1, Sr2‧‧‧ detected signals

Ctr1‧‧‧Capacitive coupling between the first conductive strip Tx1 and the second conductive strip Rx1

Cht1‧‧‧ Capacitive coupling between the first conductive strip Tx1 and the first finger H1

Chr1‧‧‧Capacitive coupling between the second conductive strip Rx1 and the first finger H1

Ctr2‧‧‧ Capacitive coupling between the first conductive strip Tx2 and the second conductive strip Rx2

Cht2‧‧‧Capacitive coupling between the first conductive strip Tx2 and the second finger H2

Chr2‧‧‧Capacitive coupling between the second conductive strip Rx2 and the second finger H2

Chg‧‧‧Capacitive coupling between body and device

R‧‧‧ impedance

Cr‧‧‧ Capacitive coupling between the second finger and the second conductive strip

Cg‧‧‧ Capacitive coupling between the second finger and the circuit to which the DC signal is supplied

Ir‧‧‧current flowing into the second conductive strip

Ig‧‧‧current flowing into the circuit that is supplying the DC signal

31‧‧‧First Conductive Strip

32‧‧‧Second strip

33‧‧‧First conductive sheet

34‧‧‧Second conductive sheet

35‧‧‧First cable

36‧‧‧second cable

37‧‧‧Extension

38‧‧‧ recessed space

39‧‧‧ Third conductive sheet

40‧‧‧Capacitive touch screen

41‧‧‧ Short side

42‧‧‧Longside

1A and FIG. 1B are schematic diagrams of a negative touch effect in the prior art; FIG. 1C and FIG. 1D are schematic diagrams of a position detecting system; FIG. 1E to FIG. 1H are schematic structural views of a sensing layer; FIGS. 2A and 2B are virtual touches. FIG. 3A to FIG. 3D are schematic diagrams showing a structure of a conductive strip; FIG. 4 is a schematic diagram of a capacitive touch screen; and FIG. 5 is a flow chart of a method for detecting a conductive touch screen.

33‧‧‧First conductive sheet

34‧‧‧Second conductive sheet

35‧‧‧First cable

36‧‧‧second cable

39‧‧‧ Third conductive sheet

Claims (25)

A method for detecting a capacitive touch screen for detecting proximity or touch of an external conductive object includes: providing a capacitive touch screen having a rectangular shape with opposite long sides and opposite short sides, including: a plurality of first conductive strips operatively provided with a driving signal during mutual capacitance detection, wherein each of the first conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of first conductive sheets, and each a first conductive sheet is an extension piece protruding from each of four sides of a square or a diamond, wherein the first conductive strip is parallel to the short side; and a plurality of second conductive strips providing a mutual capacitive coupling signal, wherein each a second conductive strip is composed of a plurality of second connecting lines connected in series with a plurality of second conductive sheets, and each of the second conductive sheets is recessed by a recessed space on each side of the square or diamond four sides, wherein the second conductive strip The second conductive strip is parallel to the long side; and the driving signal is provided, and the mutual capacitive coupling signal is received by the second conductive strip when the at least one conductive strip is supplied with the driving signal ; Provided by the long sides a driving signal to at least a first conductive strip, and receives the signal generated by mutual capacitive coupling of said second conductive strips at at least a first conductive strip is provided in the short-side driving signal. A device with a capacitive touch screen for detecting proximity or touch of an external conductive object, comprising: a capacitive touch screen: a plurality of first conductive electrodes operatively provided with a driving signal for mutual capacitance detection a strip, wherein each of the first conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of first conductive sheets, and each of the first conductive sheets protrudes from each of four sides of a square or a diamond shape; and Providing a plurality of second conductive strips of the mutual capacitive coupling signal, wherein each of the second conductive strips is composed of a plurality of second connecting lines connected in series with a plurality of second conductive sheets, and each of the second conductive strips is square or a recessed space recessed on each side of the four sides of the diamond; and a control circuit for providing the drive signal and receiving the mutual capacitive coupling signal by the second conductive strip when the at least one conductive strip is provided with the drive signal; The first conductive strip and the second conductive strip are exposed and separated from each other, and each recessed space accommodates one of the extension sheets. The device of claim 2, wherein each of the first conductive sheets has an area of the extension sheet that is equal to or larger than an area of each of the second conductive sheets plus the recessed space, such that The exposed area of the first conductive sheet is larger than the area of the second conductive sheet. A device having a capacitive touch screen according to claim 2, wherein the first conductive sheet and the second conductive sheet are in the same plane. A device having a capacitive touch screen according to claim 2, wherein the number of the first conductive strips is greater than the number of the second conductive strips. The device with a capacitive touch screen according to claim 2, wherein each of the first connecting lines spans one of the second connecting lines or each of the second connecting lines across one of the first connecting lines, The first connecting line and the second connecting line of the intersection are separated by an insulator. The device of claim 2, wherein the first conductive strip and the second conductive strip are not in the same plane, wherein the first conductive strip is closer to the outer portion than the second conductive strip Conductive object. The device of claim 7 , wherein the capacitive touch screen further comprises an insulating layer interposed between the first conductive strip and the second conductive strip. The device of claim 2, further comprising a display, wherein the display and the second conductive sheet do not have an insulating layer provided with a certain potential or the driving signal, wherein the constant potential Or the drive signal is provided when the second conductive strip provides the mutual capacitive coupling signal. The device with a capacitive touch screen according to claim 2, wherein the first conductive sheet and the second conductive sheet are not in the same plane, wherein the second guide The electric strip is closer to the display than the first conductive strip. The device of claim 2, wherein the capacitive touch screen has a rectangular shape with opposite long sides and opposite short sides, wherein the first conductive strip is between the two short sides. Arranged in parallel with the two short sides, and the second conductive strip is arranged in parallel with the two long sides between the two long sides. The device of claim 2, wherein the capacitive touch screen further comprises two first side conductive strips on opposite sides of the first conductive strip and two second side conductive strips. Separately located on two sides of the second conductive strip, wherein each of the first side conductive strips is composed of a plurality of first connecting lines connected in series with a plurality of half-piece first conductive sheets, and each of the second side conductive strips is The plurality of second connecting wires are composed of a plurality of second connecting wires connected in series. The device of claim 2, wherein the second conductive strips are arranged in parallel and have N strips, N being a natural number, wherein the control circuit generates N according to the mutual capacitive coupling signal. - 1 difference, each difference being generated by subtracting the mutual capacitive coupling signals of a pair of adjacent second conductive strips, respectively. The device of claim 2, wherein the second conductive strips are arranged in parallel and have N strips, N being a natural number, wherein the control circuit generates N according to the mutual capacitive coupling signal. - 2 double differences, each of which is based on the first two of the three adjacent second conductive strips The difference between the mutual capacitive coupling signals of the conductive strips is subtracted from the difference between the mutual capacitive coupling signals of the latter two electrical two conductive strips. The device of claim 2, wherein the exposed space between the first conductive strip and the second conductive strip has a plurality of isolated third conductive sheets, the conductive sheet and the conductive sheet The first conductive strips are of the same material. The device with a capacitive touch screen according to claim 2 of the patent application further includes a display, and a back shield layer for shielding noise from the display is not present between the first conductive strip and the display. The device of claim 1 , wherein the first conductive sheet is a hexagonal shape formed by a square or diamond-shaped extension of a triangular extension piece, and the second conductive piece has The triangular recessed space square or the hexagonal shape formed by the rhombic indentation. A capacitive touch screen for detecting proximity or touch of an external conductive object includes: a plurality of first conductive strips operatively provided with a driving signal for mutual capacitance detection, wherein each of the first conductive strips The strip is composed of a plurality of first connecting lines connected in series with a plurality of first conductive sheets, and each of the first conductive sheets protrudes from each of four sides of a square or a diamond shape; and a plurality of mutual capacitive coupling signals are provided a second conductive strip, wherein each of the second conductive strips is a plurality of second conductive sheets connected in series by a plurality of second connecting lines Composed, and each of the second conductive sheets is recessed by a recessed space on each side of the square or the four sides of the diamond; wherein the first conductive strip and the second conductive strip are exposed and separated from each other, and each recess One of the extension sheets is accommodated in the space. The capacitive touch screen of claim 18, wherein an area of each of the first conductive sheets to remove the extension sheets is equal to an area of each of the second conductive sheets plus the recessed spaces, such that the first conductive sheets are exposed The area is larger than the area of the second conductive sheet. The capacitive touch screen of claim 18, wherein the first conductive sheet and the second conductive sheet are in the same plane. The capacitive touch screen of claim 18, wherein the number of the first conductive strips is greater than the number of the second conductive strips. The capacitive touch screen of claim 18, wherein each of the first connecting lines spans one of the second connecting lines or each of the second connecting lines across one of the first connecting lines, wherein the intersection The first connecting line and the second connecting line are separated by an insulator. The capacitive touch screen of claim 18, wherein the first conductive strip and the second conductive strip are not in the same plane, wherein the first conductive strip is closer to the external conductive object than the second conductive strip. Capacitive touch screen according to item 18 of the patent application scope, including two first The side conductive strips are respectively located on two sides of the first conductive strip and the two second side conductive strips are respectively located on two sides of the second conductive strip, wherein each of the first side conductive strips is composed of a plurality of strips A connecting line is composed of a plurality of half-piece first conductive sheets connected in series, and each of the second side conductive strips is composed of a plurality of second connecting lines connected in series with a plurality of half-piece second conductive sheets. The device of claim 18, wherein the first conductive sheet is a hexagonal shape formed by a square or diamond-shaped extension of a triangular extension piece, and the second conductive piece has The triangular recessed space square or the hexagonal shape formed by the rhombic indentation.