WO2022105723A1

WO2022105723A1 - Sensing input apparatus and method based on capacitive touch input device

Info

Publication number: WO2022105723A1
Application number: PCT/CN2021/130792
Authority: WO
Inventors: 谢峰
Original assignee: 深圳市纳木智联科技有限公司
Priority date: 2020-11-17
Filing date: 2021-11-16
Publication date: 2022-05-27
Also published as: CN112256160A

Abstract

A sensing input apparatus and method based on a capacitive touch input device. The apparatus comprises a conductive sensing layer, wherein the conductive sensing layer is provided with a plurality of conductive sensing units, which are arranged in an array and in X and Y directions of a conductive sensing layer plane; the plurality of conductive sensing units are arranged isolated from each other; and when the conductive sensing layer is connected to a capacitive touch input device, the conductive sensing units are located in a projection region directly above corresponding touch sensor units in the capacitive touch input device. A conductive sensor corresponding to a touch sensor unit is arranged in a conductive sensing layer, such that a conductive path is formed between the conductive sensing layer, a conductor connected to the conductive sensing layer, and the ground, and thus, a main control system can capture a touch action and calculate the position of a touch point, and can completely replace an active/passive capacitive pen and electromagnetic pen, thereby greatly facilitating a usage scenario in which there is no direct touch by a finger.

Description

A sensor input device and method based on capacitive touch input device

technical field

The present invention relates to the field of touch input devices, and in particular, to a sensing input device and method based on capacitive touch input devices.

Background technique

Capacitive screens are currently widely used in various smart devices. The realization principle is: using the electrical conductor characteristics of the human body, when a finger touches the surface of the capacitive touch screen, a weak inductive capacitance Cf will be generated with the touch sensor unit at the corresponding position, making The original capacitance Cp between the touch sensor units captured by the main control system changes, and the main control performs relevant calculations to detect the position of the touch point. In theory, any conductive body can directly operate the capacitive touch screen. Although the conventional pen tip can conduct electricity, the inductive capacitance between it and the touch sensor unit is too small to be recognized by the touch sensor unit.

The existing solutions are as follows: First, an active capacitive pen is used, but the structure is complex, the cost is high, and the manufacturing is difficult. Convenience; second, special large-sized conductive pen caps, such as conductive silicone, conductive fiber cloth, metal conductive tips, etc., but only when the area of the pen cap reaches a certain size can it be recognized by the capacitive sensor, which affects the visual sense when writing, and the use experience is not good. Third, the electromagnetic pen is used, which has a complex structure and requires the addition of an electromagnetic input film on the host side to complete the input. The overall design is complex and the implementation cost is high, making it difficult to popularize. The above methods are either complicated in structure and require the host side to cooperate with the design and use, or the volume is too large, which affects the appearance and vision, and the use experience is not good, which makes the traditional capacitive screen inconvenient to use.

SUMMARY OF THE INVENTION

The present invention provides a sensing input device and method based on a capacitive touch input device in order to solve the technical problem that the existing common pen tip cannot operate on a capacitive screen.

The present invention provides a sensing input device based on a capacitive touch input device, comprising a conductive sensing layer, wherein the conductive sensing layer is provided with a plurality of conductive sensing layers arranged in an array along the X and Y directions of the plane of the conductive sensing layer. A plurality of the conductive sensing units are arranged in isolation from each other; when the conductive sensing layer is connected to the capacitive touch input device, the conductive sensing units are located just above the corresponding touch sensor units in the capacitive touch input device In the projection area; one or more conductive sensing units correspond to one or more touch sensor units.

Further, the length of the conductive sensing unit is L1, the width is L2, and the thickness is L3; along the width direction, the distance between adjacent conductive sensing units is L4; along the length direction, the distance between adjacent conductive sensing units is L5; the length of the touch sensor unit is L6, the width is L7, and the thickness is L8; along the width direction, the distance between adjacent touch sensor units is L9; along the length direction, the distance between adjacent touch sensor units is L10; set Lsx =L1+L5, Lsy=L2+L4, Ltx=L6+L10, Lty=L7+L9; the following relationship exists between the conductive sensing unit and the touch sensor unit: Lsx≤2*Ltx and/or Lsy≤2*Lty and/or L1≤2*Ltx and/or L2≤2*Lty.

Further, the following relationship exists between the conductive sensing unit and the touch sensor unit: Lsx=Ltx and/or Lsy=Lty and/or L1=L6 and/or L2=L7.

Further, the conductive sensing layer is made of conductive material.

Further, the area S(Usen) of the conductive sensing unit is greater than or equal to the minimum sensing area Smin of the touch sensor unit.

Further, one side of the conductive sensing layer is connected with the capacitive touch input device, and the other side is also provided with an anisotropic conductive material layer connected with the conductive sensing unit.

Further, the square resistance of the conductive sensing unit is less than or equal to 10 megohms.

On the other hand, the present invention also provides a sensing input method based on a capacitive touch input device, comprising the following steps:

Step S1, connecting a conductive sensing layer on the surface of the capacitive touch input device;

Step S2, the conductive sensing unit of the conductive sensing layer senses the user's touch operation signal;

Step S3, the conductive sensing unit of the conductive sensing layer transmits the touch operation signal to the touch sensor unit of the corresponding capacitive touch input device;

In step S4, the main control system of the capacitive touch input device scans the touch sensor unit, checks the signal change of the touch sensor unit, and transmits the user's touch operation signal to the main control system, and the main control system performs identification and execution.

Further, the step S2 specifically includes:

When a conductor with any shape and connected to the ground or power ground touches the conductive sensing layer, the corresponding conductive sensing unit is immediately connected to the ground and converted into an electrode, thereby sensing the user's touch operation signal.

Further, the step S3 specifically includes:

When the conductive sensing unit is converted into an electrode, an inductive capacitance Cf is formed between the conductive sensing unit and the corresponding touch sensor unit in the capacitive touch input device, so that the capacitance Cp between the touch sensor units changes, so that the touch operation can be changed. The signal is transmitted to the touch sensor unit of the corresponding capacitive touch input device; the capacitance Cf≥εSmin/4πkd; wherein Smin is the minimum sensing area of the touch sensor unit.

The beneficial effects of the present invention are: the present invention provides the conductive sensing layer corresponding to the touch sensor unit on the surface of the capacitive touch input device, and the conductive sensor corresponding to the touch sensor unit is arranged in the conductive sensing layer, so that the conductive sensing layer is formed. A conductive path is formed between the layer, the conductor connected to the conductive sensing layer and the human body; after this path is formed, the sensing unit in the conductive sensing layer and the touch sensor unit in the capacitive touch input device can generate sufficient strength. Inductive capacitance Cf, so that the main control system can capture the touch action and calculate the position of the touch point, which greatly facilitates the use of non-finger direct touch scenarios, and can replace active and passive capacitive pens and electromagnetic pens; in addition, a conductive sensing layer is provided. It can also play a protective role similar to a protective film on the surface of the capacitive touch input device, so that the original touch display screen is less likely to be damaged in daily use.

Description of drawings

FIG. 1 is a schematic diagram of the principle of contact between a conventional capacitive touch input device and a human finger.

FIG. 2 is a schematic diagram showing the principle of contact between a conventional capacitive touch input device and a common pen tip.

FIG. 3 is a schematic diagram of the principle of connecting the sensing input device based on the capacitive touch input device and the capacitive touch input device according to the present invention.

FIG. 4 is a schematic diagram of the connection between the sensing input device based on the capacitive touch input device, the common pen tip and the capacitive touch input device of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in FIG. 1 to FIG. 4 , the present invention provides a sensing input device based on a capacitive touch input device, including a conductive sensing layer, and the conductive sensing layer is provided with a plurality of Xs along the plane of the conductive sensing layer. , Conductive sensing units arranged in an array in the Y direction; a plurality of the conductive sensing units are isolated and insulated from each other; when the conductive sensing layer is connected to the capacitive touch input device, the conductive sensing unit is located in the capacitive touch input device In the projection area directly above the corresponding touch sensor unit in the device; one or more conductive sensing units correspond to one or more touch sensor units.

In the present invention, the conductive sensing layer corresponding to the touch sensor unit is arranged on the surface of the capacitive touch input device, and the conductive sensor corresponding to the touch sensor unit is arranged in the conductive sensing layer, so that the conductive sensing layer and the conductive sensing layer A conductive path is formed between the connected conductors and the earth or power ground; after this path is formed, the sensing unit in the conductive sensing layer and the touch sensor unit in the capacitive touch input device can generate sufficient strength inductive capacitance Cf, Therefore, the main control system can capture the touch action and calculate the position of the touch point, which greatly facilitates the use scenarios of non-finger direct touch; in addition, setting the conductive sensing layer can also act as a protective film on the surface of the capacitive touch input device. The protective effect makes the original touch display screen less likely to be damaged in daily use.

In an optional embodiment, the area S(Usen) of the conductive sensing unit is greater than or equal to the minimum sensing area Smin of the touch sensor unit.

In this embodiment, according to the capacitance determination formula C=εS/4πkd, the reason why the capacitive touch screen can detect the capacitance change caused by the human hand is that the finger acts as the conductor electrode with the contact area Sf and the capacitive touch sensor electrode forms an inductive capacitance between the electrodes. Cf, the equivalent change capacitance that can be detected and amplified by the touch processing chip itself is set to Cc; then Cf(min)=Cc=εS/4πkd; so when other parameters remain unchanged, there is an amount that can be detected by the touch sensor unit. The minimum sensing area is: Smin=4πkdCf(min)/ε. The reason why the ordinary conductive pen tip cannot operate the capacitive touch screen is because the pen tip area Sp is smaller than Smin and cannot generate an effective inductive capacitance Cf. After the conductive sensing layer is introduced in the present invention, when a conductor with any shape connected to the ground or the power ground touches a certain conductive sensing unit Use(x, y) of the surface conductive sensing layer, Usen(x, y) y) Immediately connected to ground, converted into an electrode. This electrode corresponds to the touch sensor unit Utouch(x, y) and forms a sensing capacitance Cf. The minimum effective area is the area S(Usen) of the conductive sensing unit. As long as S(Usen) ≥ Smin in the early design, Cf ≥ Cf(min) can be made to effectively trigger the touch recognition circuit. In order to simplify the description and understanding, all the above parameters are equivalent parameters, which are equivalently converted according to the relevant parameters of the actual use scene.

In addition, the touch processing chip scans the touch sensing unit, and the value of Cf at the touch sensing unit Utouch(x, y) enables the chip to detect the change of the original capacitance Cp, and the touch processing chip sends the relevant touch information to the host. The control system enables the main control system to effectively identify the input to the system by the conductive body of any shape such as the pen tip. It is not necessary to adjust the original circuit and software algorithm of the touch chip. Whether a touch action occurs in the touch sensing unit Utouch(x, y). And when you continue to operate the structure with your fingers without using tools such as writing pens, the electrodes that cooperate with the touch sensing units to generate the sensing capacitance change from the fingers to the conductive sensing units Usen (may be one or more), Since S(Usen)≥Smin, the finger touch operation can be recognized by the touch chip normally. The addition of a conductive sensing layer will not affect the use of the original device.

In an optional embodiment, the length of the conductive sensing units is L1, the width is L2, and the thickness is L3; along the width direction, the distance between adjacent conductive sensing units is L4; along the length direction, adjacent conductive The distance between the sensing units is L5; the length of the touch sensor unit is L6, the width is L7, and the thickness is L8; along the width direction, the distance between adjacent touch sensor units is L9; along the length direction, the distance between adjacent touch sensor units is L10; set Lsx=L1+L5, Lsy=L2+L4, Ltx=L6+L10, Lty=L7+L9; the following relationship exists between the conductive sensing unit and the touch sensor unit: Lsx≤2*Ltx and/or Lsy≤2*Lty and/or L1≤2*Ltx and/or L2≤2*Lty. Preferably, the following relationship exists between the conductive sensing unit and the touch sensor unit: Lsx=Ltx and/or Lsy=Lty and/or L1=L6 and/or L2=L7.

In this embodiment, in order to avoid undesirable phenomena such as jumping points and inaccurate reporting points due to one conductive sensing unit corresponding to multiple touch sensor units, the following relationship exists between the conductive sensing unit and the touch sensor unit: Lsx≤2* Ltx and/or Lsy≤2*Lty and/or L1≤2*Ltx and/or L2≤2*Lty. Preferably, the area of the conductive sensing unit is equal to the area of the touch sensor unit, and the one-to-one method can effectively avoid generating signals to multiple touch sensor units, thereby causing undesirable phenomena such as jumping points and inaccurate reporting points. In addition, relevant parameters can be adjusted according to specific usage scenarios and performance requirements (such as surface conductive sensing layer substrate material, conductive sensing unit conductive material, conductive square resistance, conductivity, and L1/L2/L3 mentioned above). /L4/L5/Lsx/Lsy and other related parameters that affect performance),

In an optional embodiment, the conductive sensing layer is made of conductive material.

In this embodiment, the conductive sensing layer can be made of any conductive material depending on the application requirements, that is, it can be a transparent conductive film (nano-scale thickness), such as ITO, nano-silver, organic conductive film and other conductive films, or a non-conductor and Opaque conductor. Specifically, the conductive sensing layer can either be directly attached to the cover plates of various materials on the surface of the capacitive touch input device by various processes, and be integrated with the capacitive touch input device, or it can be used separately in the form of accessories such as protective film and tempered film. Existing, the conductive sensing unit is placed on a variety of different substrates, and then mounted on the surface of the capacitive touch input device for use. The implementation of the present invention is not limited by the specific implementation type and main control system of the corresponding capacitive touch input device, as long as it is a capacitive touch sensing device, it can be used and regarded as a corresponding embodiment (such as GG, GF, GFF, Incell, Oncell Various capacitive touch screen implementations can be used).

In an optional embodiment, the same effect of the present invention can be achieved by increasing the number of conductive sensing layers or changing the specific shape of the conductive sensing unit, as well as various recombinations of the two methods.

In an optional embodiment, one side of the conductive sensing layer is connected to the capacitive touch input device, and the other side is further provided with an anisotropic conductive material layer connected to the conductive sensing unit. The conductive sensing layer can be extended and connected to the outer surface by the effect of the anisotropic conductive material layer.

In an optional embodiment, the square resistance of the conductive sensing unit is less than or equal to 10 megohms.

In this embodiment, since the touch chip itself scans the touch sensing unit at a certain frequency (fscan), based on the corresponding time requirements, the materials of the conductive sensing unit constituting the conductive sensing layer are not limited. The square resistance of the unit is adjusted according to different usage requirements, but the maximum value should not be greater than 10 megohms. Preferably, it should not be greater than 1 megohm under normal circumstances, so as to avoid undesired phenomena such as disconnection, no response, and missing points in actual use.

In the present invention, the conductive sensing layer corresponding to the touch sensor unit is arranged on the surface of the capacitive touch input device, and the conductive sensor corresponding to the touch sensor unit is arranged in the conductive sensing layer, so that the conductive sensing layer and the conductive sensing layer A conductive path is formed between the connected conductors and the ground; after this path is formed, the sensing unit in the conductive sensing layer and the touch sensor unit in the capacitive touch input device can generate a sufficient strength of the sensing capacitance Cf, so that the main The control system can capture the touch action and calculate the position of the touch point, which greatly facilitates the use of non-finger direct touch; in addition, the setting of the conductive sensing layer can also play a protective role similar to the protective film on the surface of the capacitive touch input device. The original touch display screen is less likely to be damaged in daily use.

In an optional embodiment, the step S2 specifically includes:

When a conductive body with any shape and connected to the ground or power ground touches the conductive sensing layer, the corresponding conductive sensing unit is immediately connected to the ground and converted into an electrode, thereby sensing the user's touch operation signal.

In this embodiment, after the conductive sensing layer is introduced into the present invention, when a conductor with any shape connected to the ground or power ground touches a conductive sensing unit Usen(x, y) of the surface conductive sensing layer, The Usen(x, y) is immediately connected to the ground and converted into an electrode; through the relative area of the conductive sensing unit and the touch sensor unit, the signal of the pen tip can be amplified and transmitted to the touch sensor unit, which is simple and convenient.

In an optional embodiment, the step S3 specifically includes:

In this embodiment, in this embodiment, according to the capacitance determination formula C=εS/4πkd, the reason why the capacitive touch screen can detect the capacitance change caused by the human hand is actually that the finger acts as the conductor electrode with the contact area Sf and the capacitive touch sensor electrode The inductive capacitance Cf is formed between them, and the equivalent capacitance that the touch processing chip itself can detect and amplify is set to Cc; then Cf(min)=Cc=εS/4πkd; so when other parameters remain unchanged, there are sensors that can be touched by the touch The minimum sensing area detected by the unit is: Smin=4πkdCf(min)/ε. The reason why the ordinary conductive pen tip cannot operate the capacitive touch screen is because the area Sp of the pen tip is smaller than Smin, and an effective inductive capacitance Cf cannot be generated. After the conductive sensing layer is introduced in the present invention, when a conductor with any shape connected to the ground or the power ground touches a certain conductive sensing unit Use(x, y) of the surface conductive sensing layer, Usen(x, y) y) Immediately conducts with the ground and turns into an electrode. This electrode corresponds to the touch sensor unit Utouch(x, y) and forms a sensing capacitance Cf. The minimum effective area is the area S(Usen) of the conductive sensing unit. As long as S(Usen) ≥ Smin in the early design, Cf ≥ Cf(min) can be made to effectively trigger the touch recognition circuit. In order to simplify the description and understanding, all the above parameters are equivalent parameters, which are equivalently converted according to the relevant parameters of the actual use scenario.

In addition, the touch processing chip scans the touch sensing unit, and the value of Cf at the touch sensing unit Utouch(x, y) enables the chip to detect the change of the original capacitance Cp, and the touch processing chip sends the relevant touch information to the host. The control system enables the main control system to effectively identify the input to the system by the conductive body of any shape such as the pen tip. It is not necessary to adjust the original circuit and software algorithm of the touch chip. Whether a touch action occurs in the touch sensing unit Utouch(x, y). And when you continue to operate the structure with your fingers without using tools such as writing pens, the electrodes that cooperate with the touch sensing units to generate the sensing capacitance change from the fingers to the conductive sensing units Usen (may be one or more), Since S(Usen)≥Smin, the finger touch operation can be recognized by the touch chip normally.

In the description of this specification, reference is made to the description of the terms "one embodiment", "some embodiments", "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. It is intended that a particular feature, structure, material or characteristic described in connection with this embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above content is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art to which the present invention pertains, some simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

A sensing input device based on a capacitive touch input device is characterized in that it comprises a conductive sensing layer, and the conductive sensing layer is provided with a plurality of conductive sensing layers arranged in an array along the X and Y directions of the plane of the conductive sensing layer. A plurality of the conductive sensing units are isolated and insulated from each other; when the conductive sensing layer is connected to the capacitive touch input device, the conductive sensing units are located on the positive side of the corresponding touch sensor units in the capacitive touch input device. In the upper projection area; one or more conductive sensing units correspond to one or more touch sensor units.
The sensing input device based on a capacitive touch input device according to claim 1, wherein the length of the conductive sensing unit is L1, the width is L2, and the thickness is L3; The distance between the sensing units is L4; along the length direction, the distance between adjacent conductive sensing units is L5; the length of the touch sensor unit is L6, the width is L7, and the thickness is L8; along the width direction, the adjacent touch sensor units are The distance is L9; along the length direction, the distance between adjacent touch sensor units is L10; set Lsx=L1+L5, Lsy=L2+L4, Ltx=L6+L10, Lty=L7+L9; The following relationships exist between the sensor units: Lsx≤2*Ltx and/or Lsy≤2*Lty and/or L1≤2*Ltx and/or L2≤2*Lty.
The sensing input device based on a capacitive touch input device according to claim 2, wherein the following relationship exists between the conductive sensing unit and the touch sensor unit: Lsx=Ltx and/or Lsy=Lty and/or L1=L6 and/or L2=L7.
The sensing input device based on a capacitive touch input device according to claim 1, wherein the conductive sensing layer is made of a conductive material.
The sensing input device based on a capacitive touch input device according to claim 2, wherein the area S(Usen) of the conductive sensing unit is greater than or equal to the minimum sensing area Smin of the touch sensor unit.
The sensing input device based on a capacitive touch input device according to claim 1, wherein one side of the conductive sensing layer is connected to the capacitive touch input device, and the other side is further provided with a conductive sensing unit. Connected layers of anisotropic conductive material.
The sensing input device based on a capacitive touch input device according to claim 1, wherein the square resistance of the conductive sensing unit is less than or equal to 10 megohms.
A sensing input method based on a capacitive touch input device, characterized in that it comprises the following steps:

Step S1, connecting a conductive sensing layer on the surface of the capacitive touch input device;

Step S2, the conductive sensing unit of the conductive sensing layer senses the user's touch operation signal;

Step S3, the conductive sensing unit of the conductive sensing layer transmits the touch operation signal to the touch sensor unit of the corresponding capacitive touch input device;

In step S4, the main control system of the capacitive touch input device scans the touch sensor unit, checks the signal change of the touch sensor unit, and transmits the user's touch operation signal to the main control system, and the main control system performs identification and execution.
The sensing input method based on a capacitive touch input device according to claim 8, wherein the step S2 specifically comprises:

When a conductive body with any shape and connected to the ground or power ground touches the conductive sensing layer, the corresponding conductive sensing unit is immediately connected to the ground, converted into an electrode, which cooperates with the touch sensing unit's own electrode to generate a Sensing inductive capacitance to sense the user's touch operation signal.
The sensing input method based on a capacitive touch input device according to claim 9, wherein the step S3 specifically comprises:

When the conductive sensing unit is converted into an electrode, an inductive capacitance Cf is formed between the conductive sensing unit and the corresponding touch sensor unit in the capacitive touch input device, so that the capacitance Cp between the touch sensor units changes, so that the touch operation can be changed. The signal is transmitted to the touch sensor unit of the corresponding capacitive touch input device; the capacitance Cf≥εSmin/4πkd; wherein Smin is the minimum sensing area of the touch sensor unit.