CN209803768U - flexible touch screen and flexible touch device based on surface electromagnetic wave - Google Patents
flexible touch screen and flexible touch device based on surface electromagnetic wave Download PDFInfo
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- CN209803768U CN209803768U CN201920586863.XU CN201920586863U CN209803768U CN 209803768 U CN209803768 U CN 209803768U CN 201920586863 U CN201920586863 U CN 201920586863U CN 209803768 U CN209803768 U CN 209803768U
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Abstract
The utility model provides a flexible touch screen and flexible touch device based on surface electromagnetic wave, the utility model discloses a flexible touch screen includes flexible dielectric basement, locates a plurality of surface electromagnetic wave input unit of flexible dielectric basement one side locate the periodic conductor pattern on flexible dielectric basement surface, and for surface electromagnetic wave input unit locates a plurality of surface electromagnetic wave output unit of the relative opposite side of flexible dielectric basement. The utility model discloses a flexible touch screen, its straight line propagation along flexible dielectric substrate surface through the surface electromagnetic wave that utilizes the input to and the touch object to the surface electromagnetic wave's of propagation absorption and the decay of scattering and the surface electromagnetic wave signal that causes, can obtain the position coordinate of touch point, with this can provide a new flexible touch part based on surface electromagnetic wave.
Description
Technical Field
the utility model relates to a touch screen technical field, in particular to flexible touch screen based on surface electromagnetic wave, the utility model discloses still relate to one kind and use the flexible touch device who has this flexible touch screen based on surface electromagnetic wave.
background
The touch control component is a component for inputting signals in a touch control mode and is a basic medium for man-machine interaction information. Due to the advantages of direct and simple operation and the like, the touch control device has wide application in touch control sensing of electronic control equipment and robots, but the common touch control component has the defects of hard texture, large volume, inconvenience in carrying and the like. The flexible touch control component just makes up the defects of the common touch control component, and the characteristic of bending is widely concerned by people.
At present, most of the flexible touch control components researched are fabric switches and flexible sensor arrays, and most of the touch control parts of the existing flexible touch control components are capacitive type and resistive type, and the specific touch position is determined by detecting the change of a direct current signal at the touch position. Although these conventional flexible touch members can achieve a function of moderate bending and touch, they have the following disadvantages.
1. when the requirement on the touch points is more, the flexibility is reduced by increasing the induction points of the touch part, and the number of wires is increased, so that the structure is complex, and the manufacture and the use of the part are not facilitated;
2. the flexible touch control component senses the touch position according to a resistance voltage division principle, and due to the fact that touch control induction cannot be conducted at the insulating point of the middle insulating layer, touch control points cannot be continuous and the resolution ratio is low;
3. The traditional flexible printed circuit board needs to be connected with the printed circuit board after being attached with the lead of the transparent conductive film, and the attaching process is complex, so that the production efficiency is low.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a flexible touch screen based on surface electromagnetic waves, so as to provide a new flexible touch component.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
A flexible touch screen based on surface electromagnetic waves, comprising:
A flexible dielectric substrate;
The surface electromagnetic wave input units are arranged on one side of the flexible dielectric substrate so as to form the coupling of the externally generated electromagnetic wave with specific frequency on the surface of the flexible dielectric substrate and form surface electromagnetic waves;
A periodic conductor pattern, which is arranged on the surface of the flexible dielectric substrate, wherein the characteristic dimension of each conductor pattern is a sub-wavelength dimension, and the conductor pattern is configured to be adapted to the structure of the flexible dielectric substrate, so that the surface electromagnetic wave of a specific frequency input by the surface electromagnetic wave input unit forms self-collimation propagation along the surface of the flexible dielectric substrate;
and the surface electromagnetic wave output units are arranged on the other opposite side of the flexible dielectric substrate relative to the surface electromagnetic wave input units and are arranged in one-to-one correspondence with the surface electromagnetic wave input units, and the surface electromagnetic wave output units are used for coupling and receiving the self-collimating transmission surface electromagnetic waves and outputting electric signals corresponding to the received surface electromagnetic waves outwards.
Further, a flexible protective layer covers the surface of the side, provided with the conductor patterns, of the flexible dielectric substrate, and is made of a transparent or non-transparent material, and the thickness of the flexible protective layer is 0-1 cm.
Furthermore, the flexible dielectric substrate is made of transparent or non-transparent flexible materials, the relative dielectric constant of the flexible dielectric substrate is 1-100, and the thickness of the flexible dielectric substrate is 10 nm-10 cm.
further, the flexible material comprises polydimethylsiloxane, polyimide plastic, polyether ether ketone or a high polymer flexible material.
further, the material of the conductor pattern includes ITO, silver nanowires, metal, graphene, polyethylenedioxythiophene, and a conductive polymer.
Further, the pattern of the conductor pattern includes a concave polygon, a convex polygon, a circle, an ellipse and a fractal pattern, and the basic pattern of the fractal pattern includes a square, a diamond shape, a cross shape, an H shape and an i shape.
further, the basic graph of the fractal graph is an H-shaped graph formed by a transverse bar-shaped body and vertical bar-shaped bodies which are orthogonally connected to two ends of the transverse bar-shaped body; the conductor pattern comprises a first-level figure in an H shape, a second-level figure in an H shape arranged at two ends of the two vertical bar-shaped bodies of the first-level figure, and a third-level figure in an H shape arranged at two ends of the two vertical bar-shaped bodies of the second-level figure; the lengths of two vertical bar bodies in the first-level graphs are different, and the lengths between the second-level graphs and the lengths between the third-level graphs both satisfy the following conditions: the length of the horizontal bar-shaped bodies is the same, and the length of the vertical bar-shaped body positioned on one side of the first level graph is smaller than that of the vertical bar-shaped body positioned on the other side of the first level graph.
Further, each conductor pattern is arranged in a rectangular area formed on the surface of the flexible dielectric substrate, the side length of each rectangular area is 50nm-10cm, and the rectangular areas are separated from each other.
further, the surface electromagnetic wave input unit and the surface electromagnetic wave output unit include a gradient super-surface or a microstrip line that can couple the surface electromagnetic wave.
Furthermore, the flexible dielectric substrate is rectangular or square, the surface electromagnetic wave input unit is respectively arranged on two adjacent sides of the flexible dielectric substrate, and the surface electromagnetic wave output unit is respectively arranged on the other two adjacent sides of the flexible dielectric substrate.
Compared with the prior art, the utility model discloses following advantage has:
flexible touch screen, based on surface electromagnetic wave position sensing principle, its collimation that follows flexible dielectric substrate surface through the surface electromagnetic wave that utilizes the input is propagated to and the touch object is to the surface electromagnetic wave's of propagation absorption and the decay of the surface electromagnetic wave signal that the scattering and cause, can obtain the position coordinate of touch point by the coordinate that the propagation path of the surface electromagnetic wave that takes place the decay corresponds, with this can provide a new flexible touch part based on surface electromagnetic wave.
Furthermore, the utility model discloses a flexible touch screen only needs to select suitable flexible dielectric basement and flexible protective layer alright accomplish flexible, collapsible. The flexible touch screen can realize a surface electromagnetic wave auto-collimation artificial super-surface structure, and a main body structure consisting of the dielectric substrate and the periodic conductor patterns on the dielectric substrate can further realize the single-layer structure characteristic, so that the manufacturing and calibration processes of the flexible touch screen can be effectively simplified.
Additionally, the utility model discloses a flexible touch screen can change the performance of flexible screen through the structural parameter who adjusts dielectric basement and conductor pattern, not only can realize the regulation of flexible touch screen resolution ratio, also can adjust the operating frequency of flexible touch screen, therefore can satisfy the resolution ratio needs of the flexible touch-control part of electron under different scenes.
Meanwhile, because the surface electromagnetic wave is sensitive to the dielectric constant of the substance, the detection of the substance with different dielectric constants can be realized by adjusting the relative dielectric constant of the medium on the attenuation side of the surface electromagnetic wave, the selectivity and the accuracy of the detection can be improved, and because the surface electromagnetic wave has no scattering property under the working frequency, the energy loss of the surface electromagnetic wave in the transmission process can be reduced, and the surface electromagnetic wave can be used for position detection in any area size.
To sum up, the utility model discloses a flexible touch screen based on surface electromagnetic wave can accomplish that the flexible is collapsible, can simplify touch screen preparation and calibration process, the loss in the reducible propagation process to can do benefit to the characteristic of surface electromagnetic wave and effectively avoid the sound wave in the environment and the interference of electromagnetic wave, in order to obtain more accurate location effect, and have fine practicality.
another object of the present invention is to provide a flexible touch device based on surface electromagnetic waves, which includes:
A flexible touch screen based on surface electromagnetic waves as described above;
The electromagnetic wave generating unit is connected with the surface electromagnetic wave input unit to generate electromagnetic waves with specific frequencies and transmit the electromagnetic waves to the surface electromagnetic wave input unit;
the signal processing unit is connected with the surface electromagnetic wave output unit and is configured to process the output electric signals so as to calculate and obtain coordinates of touch points on the flexible touch screen;
The output unit is connected with the signal processing unit so as to output the coordinate information of the touch point obtained by the signal processing unit;
and the power supply unit is provided with an electric connection end connected with an external power supply, and is connected with the electromagnetic wave generation unit, the surface electromagnetic wave input unit, the surface electromagnetic wave output unit, the signal processing unit and the output unit so as to supply power to each unit.
Further, the method also comprises the following steps:
And a wireless signal transmission unit connected to the output unit to wirelessly transmit the coordinate information output from the output unit to the outside.
Further, the coordinates of the touch points are one-dimensional coordinates along one direction of the flexible dielectric substrate, or the coordinates of the touch points are two-dimensional coordinates along two orthogonal directions of the flexible dielectric substrate.
flexible touch device based on surface electromagnetic wave through adopt as above flexible touch screen based on surface electromagnetic wave can make flexible touch device's preparation and calibration technology obtain simplifying, also can increase the application scope of flexible touch screen, and make the resolution ratio of flexible touch screen adjustable, have fine practicality.
meanwhile, by expanding and increasing the wireless signal transmission unit, the flexible touch device can have a wireless function, and the practicability of the flexible touch device can be further increased.
drawings
the accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
Fig. 1 is a schematic structural diagram of a flexible touch screen according to a first embodiment of the present invention;
fig. 2 is a structural diagram of a flexible touch screen according to a first embodiment of the present invention;
Fig. 3 is an exemplary structural diagram of a conductor pattern according to a first embodiment of the present invention;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a schematic diagram of a conductor pattern according to an embodiment of the present invention;
FIG. 6 shows the distribution of electric field when the excitation frequency is 13.4GHz, 14.5GHz, 15.5GHz and 16.5GHz respectively along the x-direction;
FIG. 7 is a graph showing the distribution of electric fields at excitation frequencies of 21.5GHz, 22.5GHz, 23.5GHz and 25GHz in the y-direction;
fig. 8 is a structural diagram of a flexible touch device according to a second embodiment of the present invention;
Fig. 9 is a structural diagram of a flexible touch device having a wireless signal transmission unit;
Description of reference numerals:
1-a flexible touch screen, 11-a flexible dielectric substrate, 12-a conductor pattern, 13-a surface electromagnetic wave input unit, 14-a surface electromagnetic wave output unit, and 15-a flexible protective layer;
2-an electromagnetic wave generating unit;
3-a signal processing unit;
4-an output unit;
5-a power supply unit;
6-wireless signal transmission unit.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example one
The embodiment relates to a flexible touch screen based on surface electromagnetic waves, and an exemplary structure of the flexible touch screen based on surface electromagnetic waves (referred to as a flexible touch screen for short) is shown in fig. 1, and the flexibility of the flexible touch screen is that the flexible touch screen can be bent and curved compared with the existing commonly-used hard touch screen, so that the effects that the hard touch screen cannot achieve volume change, portability and the like can be realized.
as shown in fig. 2, the flexible touch panel 1 of the present embodiment generally includes a flexible dielectric substrate 11, a periodic conductor pattern 12 disposed on a surface of the flexible dielectric substrate 11, a plurality of surface electromagnetic wave input units 13 disposed on one side of the flexible dielectric substrate 11, and a surface electromagnetic wave output unit 14 located on the other side of the flexible dielectric substrate 11 relative to the surface electromagnetic wave input units 13, and the surface electromagnetic wave output units 14 and the surface electromagnetic wave input units 13 on the two opposite sides are arranged in a one-to-one correspondence.
The flexible dielectric substrate 11 constitutes a carrying body of the flexible touch screen 1, and the surface electromagnetic wave input unit 13 is configured to couple externally generated electromagnetic waves to the surface of the flexible dielectric substrate 11, so as to form surface electromagnetic waves. The flexible dielectric substrate 11 preferably has a flexible plate-like structure having dielectric properties. The periodicity of the conductor pattern 12, that is, referring to fig. 2, the conductor pattern 12 has repeatability in two dimensions x and y of the dielectric substrate 11, and the arrangement of the periodically arranged conductor patterns 12 of the present embodiment can be adapted to the structure of the flexible dielectric substrate 11, so that the surface electromagnetic wave at the specific frequency coupled in by the surface electromagnetic wave input unit forms a self-aligned propagation along the surface of the flexible dielectric substrate 11. Meanwhile, the characteristic dimension of each conductor pattern 12 of the present embodiment is also a sub-wavelength dimension, that is, the characteristic dimension of a single conductor pattern 12 is smaller than the wavelength of the surface electromagnetic wave.
Specifically, the structure of the flexible dielectric substrate 11 includes parameters such as the relative dielectric constant of the flexible dielectric substrate 11 and the size of the flexible dielectric substrate 11, and the term "adapted" indicates that the conductor pattern 12 is matched with the flexible dielectric substrate 11 under different structural parameters, so that the frequency of the surface electromagnetic wave capable of self-collimating propagation is different, the flexible dielectric substrate 11 and the conductor pattern 12 under the specific structural parameters correspond to the surface electromagnetic wave capable of self-collimating propagation at the specific frequency, and the self-collimating propagation angle of the surface electromagnetic wave at the specific frequency is also fixed.
The surface electromagnetic wave output unit 14 is used for coupling and receiving the surface electromagnetic wave propagating by auto-collimation, and the surface electromagnetic wave output unit 14 can also convert the received surface electromagnetic wave into an electrical signal to conduct electricity to the outside, and the magnitude of the derived electrical signal represents the magnitude of the received surface electromagnetic wave signal, corresponding to the surface electromagnetic wave input unit 13 for coupling and inputting the surface electromagnetic wave. At this time, the magnitude of the surface electromagnetic wave signal output by one of the surface electromagnetic wave output units 14, that is, the magnitude of the received surface electromagnetic wave signal is compared with the magnitude of the surface electromagnetic wave signal input by the corresponding surface electromagnetic wave input unit 13, so that whether a touch object exists on the transmission path of the surface electromagnetic wave signal can be determined, and the surface electromagnetic wave signal is attenuated.
In addition, as a preferred exemplary structure, the flexible dielectric substrate 11 is rectangular or square (in a flat state), the surface electromagnetic wave input unit 13 is disposed on two adjacent sides of the flexible dielectric substrate 11, and the surface electromagnetic wave output unit 14 is disposed on the other two adjacent sides of the flexible dielectric substrate 11, as also shown in fig. 2.
at this time, as also shown in fig. 2, the flexible dielectric substrate 11 is located at the bottom, the periodic conductor patterns 12 are arranged on one side end surface of the flexible dielectric substrate 11 and are repeated in two dimensions, and the surface electromagnetic wave input units 13 located at one side of the flexible dielectric substrate 11 are specifically arranged at two adjacent side edges of the flexible dielectric substrate 11 along the x direction and the y direction, respectively, and the corresponding surface electromagnetic wave output units 14 are located at the other two adjacent side edges of the flexible dielectric substrate 1. The input units and the output units in the x direction and the y direction are arranged side by side, and the input units and the output units in all directions form one-to-one correspondence.
In this embodiment, in order to protect the conductor pattern 12, the surface electromagnetic wave input units 13, and the surface electromagnetic wave output units 14 disposed on the flexible dielectric substrate 11 from being accidentally damaged, a flexible protection layer 15 as shown in fig. 2 may be further disposed on the end surface of the flexible dielectric substrate 11 on the side where the conductor pattern 12 is disposed, and the flexible protection layer 15 may be directly disposed on the flexible dielectric substrate 11. In this embodiment, the material of the flexible protection layer 15 may be transparent or non-transparent, for example, it may be polymer nano material such as high molecular polyethylene, or material such as polypropylene film. In addition, the thickness of the flexible protection layer 15 may be 0-1 cm, for example, 0.5mm, and the thickness of 0 indicates that the flexible protection layer 15 may not be disposed on the flexible dielectric substrate 11.
In the embodiment, when the flexible dielectric substrate 11 is disposed, the relative dielectric constant of the material of the flexible dielectric substrate 11 is in a range of 1-100, the thickness of the dielectric substrate 11 is 10 nm-10cm, and the material of the flexible dielectric substrate 11 may be specifically made of a transparent or non-transparent material such as polydimethylsiloxane, polyimide plastic, polyetheretherketone, or a polymer flexible material, so that the types of the material of the flexible dielectric substrate 11 can be greatly increased. For the conductor pattern 12, the material of the conductor pattern 2 in this embodiment includes, but is not limited to, ITO, silver nanowires, metal, graphene, polyethylenedioxythiophene, and conductive polymer, and the metal may be, for example, copper. Meanwhile, the patterns of the conductor pattern 12 to be formed also include, but are not limited to, concave polygons, convex polygons, circles, and ovals, and fractal patterns, wherein basic patterns of the fractal patterns include, but are not limited to, squares, diamonds, crosses, H-shapes, and i-shapes, and the like.
in addition, regarding the conductor patterns 12, in the present embodiment, when the conductor patterns are disposed on the flexible dielectric substrate 11, for convenience of disposition, each conductor pattern 12 is also disposed in a rectangular region on the surface of the flexible dielectric substrate 11, the side length of the rectangular region is between 50nm and 10cm, the rectangular regions where the plurality of conductor patterns 12 are located are separated from each other and spread along the surface of the flexible dielectric substrate 11, so that the periodic repetition of the conductor patterns 12 on the surface of the flexible dielectric substrate 11 can be realized. Of course, in addition to locating each conductor pattern 12 in the rectangular area with the side length range, in the present embodiment, when the conductor patterns 12 are arranged, the shape and size of the planar area occupied by the surface of the flexible dielectric substrate 11 can also be designed according to the requirement or the specific shape of the conductor patterns 12.
In the present embodiment, the surface electromagnetic wave input unit 13 and the surface electromagnetic wave output unit 14 disposed at the side edge of the flexible dielectric substrate 11 may be designed as a gradient super-surface or a microstrip line capable of coupling the surface electromagnetic wave, and other coupling methods such as direct coupling may be used to realize the surface electromagnetic wave coupling instead of the gradient super-surface and the microstrip line.
for the arrangement of the surface electromagnetic wave input unit 13 and the surface electromagnetic wave output unit 14 formed by the gradient super surface, the microstrip line, the direct coupling, and the like, reference may be made to related patent application documents (CN201710787503.1 or CN201710786274.1) previously applied by the present inventor. Meanwhile, as for an exemplary structure of the conductor pattern 12, for example, it can refer to the above two patent application documents that the present inventor has previously applied, and the characteristics based on the surface electromagnetic wave under the conductor pattern 12 propagating along the surface of the dielectric substrate 11 in a self-collimation manner are described in the two previous applications, and at this time, for example, the detection of the path of the surface electromagnetic wave propagating through two orthogonal directions, where attenuation occurs, enables the determination of the position coordinates of the touch point.
However, it should be noted that, in addition to the above-mentioned structure of the conductor pattern referred to in the previous application of the present inventor, the conductor pattern 12 of the present embodiment may also be the structure shown in fig. 3 and combined with fig. 4 and 5, in which the conductor pattern 12 is a fractal pattern, and the basic pattern of the fractal pattern is an H-shape formed by a horizontal bar-shaped body and vertical bar-shaped bodies orthogonally connected to both ends of the horizontal bar-shaped body.
Wherein, the end of the horizontal bar-shaped body is connected with the middle part of the vertical bar-shaped body. The conductor pattern 12 of this embodiment specifically includes a first level pattern in an H-shape, a second level pattern in an H-shape disposed at two ends of two vertical bar bodies of the first level pattern, and a third level pattern in an H-shape disposed at two ends of two vertical bar bodies of the second level pattern. And the lengths of two vertical bar bodies in the first level graph are set to be different, the lengths of all the horizontal bar bodies in all the second level graphs and all the third level graphs are the same in design, but the length of the vertical bar body on one side of the first level graph in all the second level graphs is smaller than that of the vertical bar body on the other side of the first level graph, the length of the vertical bar body on one side of the first level graph in all the third level graphs is smaller than that of the vertical bar body on the other side of the first level graph, and meanwhile, the vertical bar bodies with smaller lengths in the second level graph and the third level graphs are on the same side of the first level graph.
The conductor pattern 12 provided above in the present embodiment can make the surface electromagnetic waves input by each surface electromagnetic wave input unit 113 form a straight axis scan or an oblique axis scan along a specific angle of the surface of the dielectric substrate 11, which will be confirmed by specific sample preparation and detection below. At this time, based on the dimensional parameters shown in fig. 3 and 4, the side length Dx of the rectangular region where each conductor pattern 12 is located is 2mm, Dy is 2mm, the thickness t of the conductor pattern 12 is 1um, and the thickness h of the dielectric substrate 11 is 2 mm. In the first-level pattern of the conductor pattern 12, the length a of the horizontal bar is 1mm, the lengths of the two vertical bars are b 1mm 1mm, and b 2mm 0.8mm, respectively. The lengths c1 and c2 of the horizontal strip-shaped bodies in the second-level graph are both 0.5mm, and the lengths of the vertical strip-shaped bodies positioned at two sides of the first-level graph are d 1-0.5 mm and d 2-0.4 mm respectively. The lengths e1 and e2 of the horizontal strip bodies in the third-level graph are both 0.25mm, and the lengths of the vertical strip bodies positioned at two sides of the first-level graph are respectively f 1-0.25 mm and f 2-0.2 mm. The width w of each horizontal bar-shaped body and each vertical bar-shaped body in each level of graph is 0.05 mm.
The material of the dielectric substrate 11 is selected to be polyimide plastic having a relative dielectric constant of 6.3, a magnetic permeability of 1, and a tangential loss of one thousandth, and the material of the conductor pattern 12 is metallic copper. The method comprises the steps of preparing a flexible touch screen sample by adopting the above size parameter values, detecting the prepared flexible touch screen sample, inputting a plurality of electromagnetic waves with specific frequencies and different frequency values at one side of the flexible touch screen during detection, and enabling the input methods of the electromagnetic waves to be along two orthogonal directions of x and y. At this time, as shown in fig. 6 and 7, through the detection of the field intensity distribution of the propagating surface electromagnetic wave, the inventor finds that the electromagnetic wave input by a specific frequency corresponding to the excited different frequency values forms a collimated propagation along a certain angle after being coupled to the surface of the flexible touch screen, and if the propagation along the x and y directions is taken as a straight axis propagation and the propagation at an angle with the x and y directions is taken as an oblique axis propagation, the surface electromagnetic wave propagating straight or the oblique axis propagation at a desired angle can be formed by selecting the frequency value of the input specific frequency.
The detection of the coordinates of the touch points of the touch object placed on the flexible touch screen, particularly the coordinates of the touch points during multi-point touch, using the direct axis propagation and the oblique axis propagation of the surface electromagnetic wave, generally includes the following steps.
first, a surface electromagnetic wave of a specific frequency is input through the surface electromagnetic wave input unit 13, and a straight axis scan and an oblique axis scan along the surface of the flexible touch screen are respectively performed. In the scanning process, due to the absorption and scattering of the touch object on the surface of the flexible touch screen, the attenuation of surface electromagnetic wave signals of straight axis scanning and inclined axis scanning on the transmission path where the touch object is located is formed. Next, reception of the surface electromagnetic wave on each transmission path of the linear axis scanning and the oblique axis scanning is performed by the surface electromagnetic wave output unit 14, respectively, and an electric signal corresponding to the received surface electromagnetic wave on each transmission path is output to the outside. Then, the output electric signals are processed, and then the touch position coordinates of each touch object on the surface of the flexible touch screen can be obtained through calculation.
In this embodiment, the angle of the oblique axis scanning may be selected according to the design requirement, and the method of obtaining the touch position coordinate of the touch object by combining the straight axis scanning and the oblique axis scanning (i.e. oblique scanning) to perform calculation processing may specifically refer to a multi-point positioning method such as CN103019461A or other existing infrared touch screens, which will not be described herein again. In this embodiment, the coordinate information of the touch point obtained by processing is output outwards, so that the position of the touch point on the flexible touch screen can be identified, and the accuracy of coordinate identification can be improved by adding the identifiable pseudo-coordinate by oblique axis scanning.
Example two
The present embodiment relates to a flexible touch device based on surface electromagnetic waves, which is shown in fig. 8 and includes a flexible touch screen based on surface electromagnetic waves as described in the first embodiment, and further includes an electromagnetic wave generating unit 2 connected to a surface electromagnetic wave input unit 13, a signal processing unit 3 connected to a surface electromagnetic wave output unit 14, and an output unit 4 and a power supply unit 5 connected to the signal processing unit 3.
Specifically, the electromagnetic wave generating unit 2 is used for generating an electromagnetic wave with a specific frequency and transmitting the electromagnetic wave to the surface electromagnetic wave input unit 13, and the signal processing unit 3 is used for processing the electrical signal output by the surface electromagnetic wave output unit 114 and then obtaining the position coordinates of the touch position through calculation, wherein the signal processing unit 4 is generally a computer installed with a corresponding processing program. The output unit 4 is configured to output the coordinate information of the touch point identified by the signal processing unit, and the electromagnetic wave generating unit 2 and the output unit 4 of this embodiment may be implemented by using an existing electromagnetic wave generating and transmitting related module. The power supply unit 5 of the present embodiment has an electrical connection terminal connected to an external power supply, and is connected to the electromagnetic wave generation unit 2, the surface electromagnetic wave input unit 13, the surface electromagnetic wave output unit 14, and the signal processing unit 3, the output unit 4, and the like, to supply power to the respective units.
By using the flexible touch screen in the first embodiment, the flexible touch device of the present embodiment can determine the frequency of the surface electromagnetic wave that travels in a self-collimation manner at a specific angle by determining the geometric parameters of the flexible dielectric substrate 11 and the conductor pattern 12, which is the specific frequency of the electromagnetic wave that should be generated by the electromagnetic wave generating unit 2, that is, the operating frequency of the flexible touch device.
The electromagnetic wave generating means 2 generates an electromagnetic wave of a specific frequency, that is, an operating frequency, and forms a surface electromagnetic wave through coupling of the surface electromagnetic wave input means 13, and the autocollimation propagation of the surface electromagnetic wave and the reception of the surface electromagnetic wave by the surface electromagnetic wave output means 14 and the processing of the signal processing means 3 enable the position coordinates of the touch point to be recognized.
In addition, as an improvement of the application of the flexible touch device of the present embodiment, as shown in fig. 9, a wireless signal transmission unit 6 connected to the output unit 4 may be further provided, so as to wirelessly transmit the coordinate information output by the output unit 4 to the outside. In this embodiment, the wireless signal transmission unit 6 may be an existing wireless signal transmission module. Of course, in addition to the wireless signal transmission unit 6, other modules connected to the output unit 4 may be further provided to increase the functions of the touch device by expanding different modules, so as to improve the practicability of the flexible touch device.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a flexible touch screen based on surface electromagnetic wave which characterized in that: the method comprises the following steps:
A flexible dielectric substrate;
the surface electromagnetic wave input units are arranged on one side of the flexible dielectric substrate so as to form the coupling of the externally generated electromagnetic wave with specific frequency on the surface of the flexible dielectric substrate and form surface electromagnetic waves;
a periodic conductor pattern, which is arranged on the surface of the flexible dielectric substrate, wherein the characteristic dimension of each conductor pattern is a sub-wavelength dimension, and the conductor pattern is configured to be adapted to the structure of the flexible dielectric substrate, so that the surface electromagnetic wave of a specific frequency input by the surface electromagnetic wave input unit forms self-collimation propagation along the surface of the flexible dielectric substrate;
And the surface electromagnetic wave output units are arranged on the other opposite side of the flexible dielectric substrate relative to the surface electromagnetic wave input units and are arranged in one-to-one correspondence with the surface electromagnetic wave input units, and the surface electromagnetic wave output units are used for coupling and receiving the self-collimating transmission surface electromagnetic waves and outputting electric signals corresponding to the received surface electromagnetic waves outwards.
2. the flexible touch screen based on surface electromagnetic waves of claim 1, wherein: further comprising:
the flexible protective layer is covered on the surface of one side, provided with the conductor patterns, of the flexible dielectric substrate, is made of a transparent or non-transparent material, and is 0-1 cm thick.
3. The flexible touch screen based on surface electromagnetic waves of claim 1, wherein: the flexible dielectric substrate is made of transparent or non-transparent flexible materials, the relative dielectric constant of the flexible dielectric substrate is 1-100, and the thickness of the flexible dielectric substrate is 10 nm-10 cm.
4. The flexible touch screen based on surface electromagnetic waves of claim 3, wherein: the flexible material comprises polydimethylsiloxane, polyimide plastic, polyether-ether-ketone or high-molecular flexible material.
5. the flexible touch screen based on surface electromagnetic waves of claim 1, wherein: the material of the conductor pattern comprises ITO, silver nanowires, metal, graphene, polyethylene dioxythiophene and a conductive polymer.
6. the flexible touch screen based on surface electromagnetic waves of claim 1, wherein: the pattern of the conductor pattern comprises a concave polygon, a convex polygon, a circle, an ellipse and a fractal pattern, and the basic pattern of the fractal pattern comprises a square, a diamond shape, a cross shape, an H shape and an I shape.
7. The flexible touch screen based on surface electromagnetic waves of claim 6, wherein: the basic graph of the fractal graph is an H-shaped graph formed by a transverse bar-shaped body and vertical bar-shaped bodies which are orthogonally connected to two ends of the transverse bar-shaped body; the conductor pattern comprises a first-level figure in an H shape, a second-level figure in an H shape arranged at two ends of the two vertical bar-shaped bodies of the first-level figure, and a third-level figure in an H shape arranged at two ends of the two vertical bar-shaped bodies of the second-level figure; the lengths of two vertical bar bodies in the first-level graphs are different, and the lengths between the second-level graphs and the lengths between the third-level graphs both satisfy the following conditions: the length of the horizontal bar-shaped bodies is the same, and the length of the vertical bar-shaped body positioned on one side of the first level graph is smaller than that of the vertical bar-shaped body positioned on the other side of the first level graph.
8. The flexible touch screen based on surface electromagnetic waves of claim 1, wherein: each conductor pattern is arranged in a rectangular area formed on the surface of the flexible dielectric substrate, the side length of each rectangular area is 50nm-10cm, and the rectangular areas are separated from each other.
9. the flexible touch screen based on surface electromagnetic waves of claim 1, wherein: the surface electromagnetic wave input unit and the surface electromagnetic wave output unit comprise gradient super surfaces or microstrip lines which can couple the surface electromagnetic waves.
10. the flexible touch screen based on surface electromagnetic waves of any one of claims 1 to 9, wherein: the flexible dielectric substrate is rectangular or square, the surface electromagnetic wave input unit is respectively arranged on two adjacent sides of the flexible dielectric substrate, and the surface electromagnetic wave output unit is respectively arranged on the other two adjacent sides of the flexible dielectric substrate.
11. a flexible touch device based on surface electromagnetic waves is characterized in that: the method comprises the following steps:
The surface electromagnetic wave based flexible touch screen according to any one of claims 1 to 10;
the electromagnetic wave generating unit is connected with the surface electromagnetic wave input unit to generate electromagnetic waves with specific frequencies and transmit the electromagnetic waves to the surface electromagnetic wave input unit;
the signal processing unit is connected with the surface electromagnetic wave output unit and is configured to process the output electric signals so as to calculate and obtain coordinates of touch points on the flexible touch screen;
The output unit is connected with the signal processing unit so as to output the coordinate information of the touch point obtained by the signal processing unit;
And the power supply unit is provided with an electric connection end connected with an external power supply, and is connected with the electromagnetic wave generation unit, the surface electromagnetic wave input unit, the surface electromagnetic wave output unit, the signal processing unit and the output unit so as to supply power to each unit.
12. The flexible touch device based on surface electromagnetic waves of claim 11, wherein: further comprising:
and a wireless signal transmission unit connected to the output unit to wirelessly transmit the coordinate information output from the output unit to the outside.
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| CN113745826A (en) * | 2021-08-25 | 2021-12-03 | 电子科技大学 | Elliptical fractal circular patch antenna |
| CN113745826B (en) * | 2021-08-25 | 2023-02-21 | 电子科技大学 | Elliptical fractal circular patch antenna |
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