CN111857415B

CN111857415B - Multi-point type resistance touch screen and addressing method

Info

Publication number: CN111857415B
Application number: CN202010628876.6A
Authority: CN
Inventors: 孙树清; 邵若梅
Original assignee: Shenzhen International Graduate School of Tsinghua University
Current assignee: Shenzhen International Graduate School of Tsinghua University
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2024-02-27
Anticipated expiration: 2040-07-01
Also published as: CN111857415A

Abstract

The invention provides a multipoint resistive touch screen and an addressing method, wherein the multipoint resistive touch screen comprises a first conductive layer, a second conductive layer and a first conductor, wherein the first conductor is an array structure formed by a plurality of strip conductors, is isolated from the second conductive layer through the support of a first insulating layer under the condition of no external pressure, and is in electrical contact with the second conductive layer through the deformation of the first insulating layer under the condition of external pressure; and the second conductive layer comprises a second conductor, a first electrode and a second electrode which are electrically connected with the second conductor, the second conductor is a whole-surface transparent conductor, and the second conductor is adhered on the second insulating layer. Only the first conductive layer and the second conductive layer are in a two-layer structure, the first insulating layer supports the first conductive body, isolation of the first conductive body and the second conductive body is achieved, an intermediate isolation lattice/net layer is directly omitted, and the integration degree and the light transmittance of the touch screen are improved.

Description

Multi-point type resistance touch screen and addressing method

Technical Field

The invention relates to the technical field of flexible electronics, in particular to a multipoint resistive touch screen and an addressing method.

Background

The widely used touch screen technology in the market at present is divided into two major categories, namely capacitive and resistive. Capacitive principle touch screens exist as single-point surface capacitive touch screens and as multi-point self-capacitance/mutual-capacitance touch screens. The sensing principle determines some limitations in the use of capacitive touch screens. The single-point surface capacitance touch screen has nonlinear distortion of coordinate mapping, and is extremely easy to be interfered by signals such as external power frequency, humidity degree and the like. The multipoint capacitive touch screen occupies the dominant position of the market, but the capacitive principle determines that signal crosstalk exists between adjacent pixel points of the touch screen, so that the physical resolution is low. The touch screen based on the resistive principle in the market basically stays in the single-point touch stage. The single-point touch screen based on the resistive principle has certain advantages in performance, for example, continuous analog signal position information output is realized based on the touch principle, so that the touch resolution is only dependent on the AD sampling precision of the control IC; meanwhile, the application object for touch control is not limited, and can be a conductive body, such as a finger or a non-conductive body, such as a rubber nib or a finger with thick gloves. However, the multi-point resistive touch screen in the prior art adopts a multi-layer structure design and has limitations.

The multipoint touch screen is an important index for restricting marketization of the multipoint touch screen in terms of response speed and point reporting rate. The existing multi-point touch screen quick response can only carry out optimal design on a control IC from the aspect of software. A conventional multi-touch screen (length x width=m x n) addressing refresh means that at least every physical pixel point needs to be accessed once, i.e. refreshed once every m x n times. In order to greatly improve the refresh rate, public technology adopts a mode of simultaneously powering up one side interface to reduce the refresh rate to m+n times. However, this design causes problems of ghost points, increasing the error rate and uncertainty of position recognition.

The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the invention and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by the present application without undue evidence prior to the present application.

Disclosure of Invention

The invention provides a multipoint resistive touch screen and an addressing method for solving the existing problems.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a multi-point resistive touch screen, comprising: the first conductive layer is positioned above the second conductive layer and comprises a first conductive body, the first conductive body is an array structure formed by a plurality of strip conductors, the first conductive body is isolated from the second conductive layer through the support of the first insulating layer under the condition of no external pressure, and the first conductive body is in electrical contact with the second conductive layer through the deformation of the first insulating layer under the condition of external pressure; the second conductive layer comprises a second conductive body, a first electrode and a second electrode, wherein the first electrode and the second electrode are electrically connected with the second conductive body, the second conductive body is a whole-surface transparent conductive body, and the second conductive body is adhered on the second insulating layer.

Preferably, the first insulating layer includes a first face, a second face, a third face, and a fourth face; the first surface is attached to the second conductor, and the strip conductor of the first conductor is embedded in a first space formed by the second surface, the third surface and the fourth surface under the condition of no external pressure, so that the height of the first conductor is higher than that of the second conductor; the first electrical conductor is in electrical contact with the second electrical conductor by deformation of the first insulating layer in the presence of an external pressure.

Preferably, the first insulating layer and the second insulating layer encapsulate the first electrical conductor and the second electrical conductor.

Preferably, each of the strip conductors of the first electrical conductor is connected to a terminal for acquiring an electrical signal of the strip conductor; the first electrode and the second electrode are respectively connected with terminals for applying a direct current level to the second conductor.

Preferably, the first conductor and the second conductor are made of an oil-water two-phase ion conductive composite gel material.

Preferably, the oil-water two-phase ion conductive composite gel material comprises: ion-conductive composite PAAM/sodium alginate hydrogel, ion-conductive composite PEGDA hydrogel, ion-conductive composite PMMA hydrogel or ion-conductive composite chitosan hydrogel.

Preferably, the preparation method of the ion-conductive composite PAAM/sodium alginate hydrogel material comprises the following steps: A. uniformly mixing sodium alginate, acrylamide, N-dimethyl bisacrylamide, ammonium persulfate and glycerol to obtain a prepolymer aqueous solution, vacuum drying the prepolymer aqueous solution, and then introducing the prepolymer aqueous solution into a prefabricated mold; B. taking out the material in the prefabricated mold for solidification; C. and (3) soaking the cured material in neutral saline solution, taking out, and then placing the cured material into an oven with the temperature higher than room temperature for surface drying or directly drying to obtain the PAAM/sodium alginate hydrogel material.

Preferably, benzophenone is used as a radical initiator to bond the first electrical conductor to the first insulating layer and/or to bond the second electrical conductor to the second insulating layer.

Preferably, bonding the first electrical conductor and the first insulating layer together and/or bonding the second electrical conductor and the second insulating layer together specifically includes: immersing the first insulating layer or the second insulating layer in a first solution, wherein the first solution is formed by dissolving benzophenone in an ethanol solution; then taking out the first insulating layer or the second insulating layer, cleaning the surface by using ethanol and deionized water, and then soaking the first insulating layer or the second insulating layer in a glycerol-free precursor aqueous solution of the oil-water two-phase ion conductive composite gel; and D, taking out, then dropwise adding the prepolymer aqueous solution prepared in the step A containing the photosensitizer, and carrying out light curing.

The invention also provides an addressing method, which adopts the multipoint resistive touch screen as described in any one of the above, and specifically comprises the following steps: s1: measuring the resistance R1 of the strip conductor and the resistance R0 of the second conductor in the first conductor respectively; the method comprises the steps of obtaining mapping between a physical limit position of a multipoint resistance touch screen and a logic position on a screen of a controlled terminal through calibration; s2: acquiring direction information of the controlled terminal screen and starting to poll and detect voltage signals and current signals of the strip conductors in the first conductor; the direction information comprises a horizontal screen mode and a vertical screen mode, wherein the direction of the controlled terminal screen is perpendicular to the direction of the strip-shaped conductor in the first conductor in the horizontal screen mode, and the direction of the controlled terminal screen is parallel to the direction of the strip-shaped conductor in the first conductor in the vertical screen mode; s3: in the horizontal screen mode, the normalized coordinates of the single-point touch contact are (np/n, vp/V), the piezoresistance is rp=v/Ap-Vp/V (R1-R0) -R0, where Rp is the resistance value of the strip-shaped conductors in the first conductor, np is the number of the strip-shaped conductors in the first conductor, n is the total number of the strip-shaped conductors in the first conductor, vp is the voltage value measured by np of the strip-shaped conductors in the first conductor, ap is the current value measured by np of the strip-shaped conductors in the first conductor, and V is the dc level value of the second conductor; the two-point touch control needs to increase the voltage value extraction of the contact edge, and the compensation calculation is carried out on the contact center according to the contact edge information, wherein the compensation value is determined by the average value of the diameter of the contact; and in the vertical screen mode, judging the number of the contacts according to the distance of an effective voltage signal in the voltage detection of the strip conductor in the first conductor, and sequentially carrying out the normalized coordinates and piezoresistance of each contact according to the single-point touch mode for measurement.

The beneficial effects of the invention are as follows: the multi-point type resistance touch screen and the addressing method are provided, and through designing an integrated structure of an insulation package and an intermediate insulation layer, only a first conductive layer and a second conductive layer are provided, the first insulation layer supports the first conductive body, the isolation of the first conductive body and the second conductive body is realized, an intermediate isolation lattice/mesh layer is directly omitted, and the integrated degree and the light transmittance of the touch screen are improved.

Further, the bonding reliability of the whole multipoint type resistance touch screen is greatly improved, the manufacturing process is simpler and more effective, and the service life is prolonged.

In terms of functions, as the second conductor is of a whole-surface structure and the first conductor is of a strip-shaped array structure (such as m strips), the design of the invention fully utilizes various information of the resistance signal to prevent ghost points, and the refresh once under m addressing accesses can be realized through the integral one-time power-on of the second conductor; further, the multi-touch screen can detect the position and pressure of each contact in terms of functions.

Drawings

Fig. 1 is a schematic structural diagram of a multi-point resistive touch screen according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a multi-point resistive touch screen according to another embodiment of the present invention.

FIG. 3 is a flow chart of an addressing method according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of an addressing method in an embodiment of the invention.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the embodiments of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for both the fixing action and the circuit communication action.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the invention and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

The multi-point type resistance touch screen in the prior art is designed into a multi-layer structure, and particularly, the existence of an intermediate isolation dot matrix/mesh layer is that the spacer layer is thicker and heavier than a capacitance screen and is more complicated to prepare no matter the spacer layer is prepared by adopting methods such as chemical deposition and the like on a rigid screen or adopting modes such as screen printing and the like on a flexible screen. Meanwhile, the lamination reliability among the layers of the structure is more outstanding on the flexible touch screen in the field of the electronic front edge, so that the promotion of the resistive touch screen in the market of the flexible field is seriously hindered. The more rare multi-point resistive touch screen designs of the prior art still retain this structure.

Referring to fig. 1, the present invention provides a multi-point resistive touch screen, including:

the first conductive layer is positioned above the second conductive layer and comprises a first conductive body 1, the first conductive body 1 is an array structure formed by a plurality of strip conductors, the first conductive body is isolated from the second conductive layer through the support of the first insulating layer 2 under the condition of no external pressure, and the first conductive body is in electrical contact with the second conductive layer through the deformation of the first insulating layer under the condition of external pressure;

the second conductive layer comprises a second conductive body 3, a first electrode and a second electrode which are electrically connected with the second conductive body, wherein the second conductive body is a whole-surface transparent conductive body, and the second conductive body is adhered on the second insulating layer 4.

It can be understood that the invention designs an integrated structure of the insulating package and the middle insulating layer, only has a two-layer structure of the first conducting layer and the second conducting layer, the first insulating layer supports the first conducting body, the isolation of the first conducting body and the second conducting body is realized, the middle isolating lattice/net layer is directly omitted, and the integrated degree and the light transmittance of the touch screen are improved.

Unlike the prior art multi-point resistive touch screen, the rapid response of the prior multi-point touch screen can only be optimally designed on the control IC from the software aspect. A conventional multi-touch screen (length x width=m x n) addressing refresh means that at least every physical pixel point needs to be accessed once, i.e. refreshed once every m x n times. In order to greatly improve the refresh rate, public technology adopts a mode of simultaneously powering up one side interface to reduce the refresh rate to m+n times. However, this design causes problems of ghost points, increasing the error rate and uncertainty of position recognition.

As shown in fig. 1, in one embodiment of the present invention, the first insulating layer includes a first face 5, a second face 6, a third face 7, and a fourth face 8; the first surface 5 is attached to the second conductor 3, and the strip conductor of the first conductor 1 is embedded in a first space formed by the second surface 6, the third surface 7 and the fourth surface 8 under the condition of no external pressure, so that the height of the first conductor 1 is higher than that of the second conductor 3; in the presence of an external pressure, the first electrical conductor 1 is in electrical contact with the second electrical conductor 3 by deformation of the first insulating layer 2.

The first insulating layer 2 and the second insulating layer 4 encapsulate the first electrical conductor 1 and the second electrical conductor 3.

The first conductor 1 is embedded in the first insulating layer 2, the first conductor 1 is isolated from the second conductor 3 by a structure similar to a bridge type first insulating layer 2, and meanwhile, the first insulating layer 2 is made of flexible materials and can deform under the action of pressure, so that the first conductor 1 and the second conductor 3 can be tried to be electrically contacted through the deformation of the first insulating layer 2.

With the advent of flexible OLED electronic screens in the market, mobile phones, watches, and other wearable electronic devices have increasingly demanded flexible electronics, and flexible touch input devices have emerged as a market demand and development opportunity. However, most of the touch screens of the prior art controllers in the current market are made of glass-based Indium Tin Oxide (ITO). Such a controller touch screen is rigid and transparent. The ITO material is coated on the glass screen by chemical methods such as vapor deposition, has rigidity and brittleness, has light transmittance of less than 80 percent, and is yellow due to light wave interference. In terms of material sources, indium tin oxide is a rare earth material, and along with the gradual increase of the use amount of electronic equipment such as mobile phones and the like, the material is less and less in stock, and the price is high. The market needs to develop alternative flexible touch screen materials and designs to replace the existing technology.

The nano silver wire flexible touch screen technology which is about to enter the market has the limitation. The nanometer silver particles are subjected to imaging self-assembly by a nanometer technology, the preparation process is complex, and the shapes and the sizes are different. And silver has certain cost as noble metal, and is easy to oxidize and blacken in the air, so that the conductivity and the stability of the material are seriously affected. Secondly, the flexible bending radius of the nano silver flexible screen is limited to a certain extent, and the nano silver flexible screen can complete limited curling operation, but resists other mechanical operations such as folding, stretching, twisting and the like.

Other conductive materials based on micro-nano technology, such as graphene, carbon nanotube and other carbon-based conductive films, have the limitation of complexity and flexibility in the manufacturing process. In addition, the conductive materials including nano silver are opaque due to the intrinsic material matrix, the transmittance of the prepared conductive materials is not high, and the conductive materials are provided with different degrees of ground colors, such as a carbon nano tube conductive film with a slight dark cyan color, which can bring color bias to the OLED screen display below. Further, if the film coating degree cannot ensure high uniformity, the display color shift degree is emphasized.

Therefore, in the aspect of material selection, the novel oil-water two-phase conductive gel and silica gel are preferably used as materials. The price is extremely low, and the market popularization is facilitated. Based on the characteristics of transparent gel, the exploring requirement of future markets on depth flexibility (arbitrary bending, curling and stretching) is solved; instead of using rare metal thin films (ITO) and noble metal thin films. In the existing water phase ion conductive material technology, the glycerin/water mixed two-phase hydrogel has the characteristic of low-temperature operation, and the operating temperature is as low as minus 30 degrees. Meanwhile, in the use process of the oil-water mixed hydrogel, the problem of adhesion of the fine micro-nano structure gel layer and the insulating layer becomes a new challenge.

In one embodiment of the present invention, the first conductor and the second conductor are made of an oil-water two-phase ion conductive composite gel material. The oil-water two-phase ion conductive composite gel material comprises:

ion-conductive composite PAAM/sodium alginate hydrogel, ion-conductive composite PEGDA hydrogel, ion-conductive composite PMMA hydrogel or ion-conductive composite chitosan hydrogel.

The preparation method of the ion-conductive composite PAAM/sodium alginate hydrogel material comprises the following steps:

A. uniformly mixing sodium alginate, acrylamide, N-dimethyl bisacrylamide, ammonium persulfate and glycerol to obtain a prepolymer aqueous solution, vacuum drying the prepolymer aqueous solution, and then introducing the prepolymer aqueous solution into a prefabricated mold;

B. taking out the material in the prefabricated mold for solidification;

C. and (3) soaking the cured material in neutral saline solution, taking out, and then placing the cured material into an oven with the temperature higher than room temperature for surface drying or directly drying to obtain the PAAM/sodium alginate hydrogel material.

Compared with the traditional rigid ITO touch screen and the latest nano silver flexible touch screen scheme, the oil-water two-phase ion conductive gel has the advantages that the cost is greatly reduced, the ultimate performances such as fatigue strength, tensile property and torsion are greatly improved (the tensile property can reach more than 15 times), and good biocompatibility is achieved.

The novel oil-water two-phase ion conductive material and the insulating layer (silica gel) are combined, so that the colorless, high-transparency and stretchable resistive multi-point flexible touch screen with high reliability and wide temperature range is realized.

In one embodiment of the invention, 1.5wt% sodium alginate, 12.44wt% acrylamide, 0.0074wt% N, N-dimethyl bisacrylamide (MBAA) and 0.2wt% ammonium persulfate are uniformly mixed to form a suspension, and the suspension is placed into a vacuum drying oven to be vacuumized for 15min, taken out and then introduced into a prefabricated mold; the neutral salt may be a calcium chloride solution, a sodium chloride solution; the cross-linking degree of the sodium alginate can be further increased and the surface viscosity can be reduced by soaking the solidified material in neutral salt solution.

In one embodiment of the invention, benzophenone is used as a free radical initiator to bond the first electrical conductor to the first insulating layer and/or to bond the second electrical conductor to the second insulating layer. And performing chemical bonding and pasting aiming at the pasting problem of the first conductor and the insulating layer.

Bonding the first electrical conductor to the first insulating layer and/or bonding the second electrical conductor to the second insulating layer specifically includes: immersing the first insulating layer or the second insulating layer in a first solution, wherein the first solution is formed by dissolving benzophenone in an ethanol solution; then taking out the first insulating layer or the second insulating layer, cleaning the surface by using ethanol and deionized water, and then soaking the first insulating layer or the second insulating layer in glycerol-free precursor aqueous solution of the oil-water two-phase ion conductive composite gel, wherein the precursor is deeply diffused in the surface to be bonded, and the step of reliably bonding is particularly important in a fine structure; and D, taking out, then dropwise adding the prepolymer aqueous solution prepared in the step A containing the photosensitizer, and carrying out light curing. Can be cured by irradiation with light under an ultraviolet lamp (preferably 8W).

In a specific embodiment, the concentration of the first solution ranges from 5% to 40% by weight.

In another embodiment of the invention, as shown in fig. 2, each of the strip conductors of the first electrical conductor is connected to a terminal 9 for obtaining an electrical signal of the strip conductor; the first electrode 10 and the second electrode 11 are connected to terminals, respectively, for applying a dc level to the second electrical conductor.

The first conductor is divided into very fine strip conductors embedded in the first insulating layer. And the whole second conductor is stuck on the second insulating layer. The lower surface of the first insulating layer naturally conforms to the upper surface of the second conductor and the first conductor is isolated from the second conductor before the contact event does not occur. After the contact is pressed, the first conductor is pressed against the second conductor, so that (1) a voltage-position signal and (2) a current-pressure signal can be measured from the point where each strip-shaped conductor of the first conductor is connected to one terminal 9.

The second conductor is added with a dc level V-0 as shown in fig. 2. When contact pdot 12 is pressed, the first and second conductors are brought into contact conduction at pdot 12. By polling each terminal 9 (m), one refresh can be completed through voltage measurement and current measurement under m addressing. Assuming that the voltage value Vp measured at the number np (total terminal number N) in the first conductor is based on the resistive voltage division principle, the normalized coordinate of the P point 12 is (np/N, vp/V). Meanwhile, the principle of pressure measurement at point P12: the magnitude of the pressure is responsive to the magnitude of the contact resistance between the first electrical conductor and the second electrical conductor being different. When the pressure at the P point 12 is smaller, the contact resistance Rp is larger, and when the pressure at the P point 12 is increased, the contact surface resistance at the P point 12 is reduced under the influence of the deformation of the upper surface, so that the current measured at the np terminal is increased, and the pressure is in direct proportion to the current and in inverse proportion to the piezoresistance Rp.

The resistance value can be obtained by the formula Fp oc 1/rp=1/(V/Ap-Vp/V (R1-R0), where Rp is the piezoresistive value at point p, ap is the measured current value at terminal np, R1 is the resistance of the first conductor, and R0 is the resistance of the second transparent conductor. Fig. 2 shows a vertical screen in use state, and multi-point (+.gtoreq.two-point) touch control can be realized. Two-point touch control can be realized in the horizontal screen state.

Fig. 3 is a schematic flow chart of an addressing method of the present invention.

As shown in fig. 4, an addressing method is characterized by adopting the multi-point resistive touch screen as described in any one of the foregoing, and specifically includes the following steps:

s1: measuring the resistance R1 of the strip conductor and the resistance R0 of the second conductor in the first conductor respectively; the method comprises the steps of obtaining mapping between a physical limit position of a multipoint resistance touch screen and a logic position on a screen of a controlled terminal through calibration;

it is understood that the calibration may be performed by using the four corner positions of the multi-point resistive touch screen using the methods in the prior art.

S2: acquiring direction information of the controlled terminal screen and starting to poll and detect voltage signals and current signals of the strip conductors in the first conductor; the direction information comprises a horizontal screen mode and a vertical screen mode, wherein the direction of the controlled terminal screen is perpendicular to the direction of the strip-shaped conductor in the first conductor in the horizontal screen mode, and the direction of the controlled terminal screen is parallel to the direction of the strip-shaped conductor in the first conductor in the vertical screen mode;

the direction information of the controlled terminal screen can be obtained through a gyroscope and the like.

S3: in the horizontal screen mode, the normalized coordinates of the single-point touch contact are (np/n, vp/V), the piezoresistance is rp=v/Ap-Vp/V (R1-R0) -R0, where Rp is the resistance value of the strip-shaped conductors in the first conductor, np is the number of the strip-shaped conductors in the first conductor, n is the total number of the strip-shaped conductors in the first conductor, vp is the voltage value measured by np of the strip-shaped conductors in the first conductor, ap is the current value measured by np of the strip-shaped conductors in the first conductor, and V is the dc level value of the second conductor;

the two-point touch control needs to increase the voltage value extraction of the contact edge, and the compensation calculation is carried out on the contact center according to the contact edge information, wherein the compensation value is determined by the average value of the diameter of the contact;

and in the vertical screen mode, judging the number of the contacts according to the distance of an effective voltage signal in the voltage detection of the strip conductor in the first conductor, and sequentially carrying out the normalized coordinates and piezoresistance of each contact according to the single-point touch mode for measurement.

The embodiment of the application also provides a control device, which comprises a processor and a storage medium for storing a computer program; wherein the processor is adapted to perform at least the method as described above when executing said computer program.

It can be understood that the optimal state that the structure of the invention can achieve is to detect two points when the screen is horizontal and to detect multiple points when the screen is vertical. The first conductive layer is an array electrode formed by strip electrodes, and the number of the strip electrodes is the physical resolution of the X axis. Theoretically, the Y-axis signals of all fingers (namely, the signals can be obtained through conversion and calculation of the I/O port voltage signals corresponding to all strip electrodes of the A layer) can be measured. And the number of the strip electrodes in the transverse screen mode becomes the physical resolution of the Y axis. If a plurality of points are pressed on the same bar electrode in the using process, the I/O port voltage signal corresponding to the bar electrode is the central value of the pressing point position. Therefore, the center position of the contact can be judged by detecting the edge of the contact only through the distribution of the strip-shaped electrodes with high resolution (the micron scale can be realized).

It can be understood that based on the structure of the multipoint resistive touch screen, an ultrafast response algorithm is designed to reduce the response speed from m×n addressing/refreshing to m addressing/refreshing, and no false "ghost points" are generated.

The algorithm of the invention does not relate to pressure detection, is a multifunctional integrated algorithm, and subdivides the calculation of the contact positions of the horizontal screen and the vertical screen.

The embodiments also provide a storage medium storing a computer program which, when executed, performs at least the method as described above.

Embodiments of the present application also provide a processor executing the computer program, at least performing the method as described above.

The storage medium may be implemented by any type of volatile or non-volatile storage device, or combination thereof. The nonvolatile Memory may be a Read Only Memory (ROM), a programmable Read Only Memory (PROM, programmable Read-Only Memory), an erasable programmable Read Only Memory (EPROM, erasableProgrammable Read-Only Memory), an electrically erasable programmable Read Only Memory (EEPROM, electricallyErasable Programmable Read-Only Memory), a magnetic random Access Memory (FRAM, ferromagneticRandom Access Memory), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disk, or a compact disk Read Only (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronousStatic Random Access Memory), dynamic random access memory (DRAM, dynamic Random AccessMemory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random AccessMemory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data RateSynchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The storage media described in embodiments of the present invention are intended to comprise, without being limited to, these and any other suitable types of memory.

In the several embodiments provided in this application, it should be understood that the disclosed systems and methods may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.

The units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware associated with program instructions, where the foregoing program may be stored in a computer readable storage medium, and when executed, the program performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk or an optical disk, or the like, which can store program codes.

Alternatively, the above-described integrated units of the present invention may be stored in a computer-readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, ROM, RAM, magnetic or optical disk, or other medium capable of storing program code.

The methods disclosed in the several method embodiments provided in the present application may be arbitrarily combined without collision to obtain a new method embodiment.

The features disclosed in the several product embodiments provided in the present application may be combined arbitrarily without conflict to obtain new product embodiments.

The features disclosed in the several method or apparatus embodiments provided in the present application may be arbitrarily combined without conflict to obtain new method embodiments or apparatus embodiments.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several equivalent substitutions and obvious modifications can be made without departing from the spirit of the invention, and the same should be considered to be within the scope of the invention.

Claims

1. A multi-point resistive touch screen, comprising:

the first conductive layer is positioned above the second conductive layer and comprises a first conductive body, the first conductive body is an array structure formed by a plurality of strip-shaped conductors, the first conductive body is embedded in a bridge-type inverted concave similar to a bridge-type first insulating layer, the first conductive body is isolated from the second conductive layer through a bridge-type support similar to the bridge-type first insulating layer under the condition of no external pressure, an intermediate isolating lattice/net layer between the first conductive layer and the second conductive layer is omitted, namely, a separate intermediate insulating layer is omitted, and the first conductive body embedded in the bridge-type inverted concave of the first insulating layer is electrically contacted with the second conductive layer through deformation similar to the bridge-type first insulating layer under the condition of external pressure;

the second conductive layer comprises a second conductive body, a first electrode and a second electrode, wherein the first electrode and the second electrode are electrically connected with the second conductive body, the second conductive body is a whole-surface transparent conductive body, and the second conductive body is adhered on the second insulating layer;

the first insulating layer and the second insulating layer encapsulate the first conductor and the second conductor, and the support of the first insulating layer is used for realizing an integrated structure of insulating encapsulation and an intermediate insulating layer.

2. The multi-point resistive touch screen of claim 1, wherein the first insulating layer comprises a first face, a second face, a third face, and a fourth face;

the first surface is attached to the second conductor,

the strip-shaped conductor of the first conductor is embedded in a first space formed by the second surface, the third surface and the fourth surface under the condition of no external pressure, and the height of the first conductor is higher than that of the second conductor;

the first electrical conductor is in electrical contact with the second electrical conductor by deformation of the first insulating layer in the presence of an external pressure.

3. The multi-point resistive touch screen of claim 1, wherein each of the strip conductors of the first electrical conductor is connected to a terminal for acquiring an electrical signal of the strip conductor;

the first electrode and the second electrode are respectively connected with terminals for applying a direct current level to the second conductor.

4. A multi-point resistive touch screen as recited in any of claims 1-3 wherein said first electrical conductor and said second electrical conductor are formed from a gel material of the oil-water two-phase ionic conduction composite type.

5. The multi-point resistive touch screen of claim 4, wherein the oil-water two-phase ion conductive composite gel material comprises:

6. The multi-point resistive touch screen of claim 5, wherein the method for preparing the ion-conductive composite PAAM/sodium alginate hydrogel material comprises:

B. taking out the material in the prefabricated mold for solidification;

7. The multi-point resistive touch screen of claim 4, wherein benzophenone is used as a radical initiator to bond the first electrical conductor to the first insulating layer and/or to bond the second electrical conductor to the second insulating layer.

8. The multi-point resistive touch screen of claim 7, wherein bonding the first electrical conductor to the first insulating layer and/or bonding the second electrical conductor to the second insulating layer comprises: immersing the first insulating layer or the second insulating layer in a first solution, wherein the first solution is formed by dissolving benzophenone in an ethanol solution; then taking out the first insulating layer or the second insulating layer, cleaning the surface by using ethanol and deionized water, and then soaking the first insulating layer or the second insulating layer in a glycerol-free precursor aqueous solution of the oil-water two-phase ion conductive composite gel; and D, taking out, then dropwise adding the prepolymer aqueous solution prepared in the step A containing the photosensitizer, and carrying out light curing.

9. An addressing method, characterized in that a multi-point resistive touch screen according to any one of claims 1-8 is used, comprising the following steps: