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CN102339166A - Foldable and flexibly-deformable piezoelectric touch screen - Google Patents

Foldable and flexibly-deformable piezoelectric touch screen Download PDF

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Publication number
CN102339166A
CN102339166A CN201110308151XA CN201110308151A CN102339166A CN 102339166 A CN102339166 A CN 102339166A CN 201110308151X A CN201110308151X A CN 201110308151XA CN 201110308151 A CN201110308151 A CN 201110308151A CN 102339166 A CN102339166 A CN 102339166A
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piezoelectric
piezoelectric film
electrode
touch screen
array
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褚祥诚
王林
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Tsinghua University
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Tsinghua University
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Abstract

本发明公开了属于压电触摸屏技术领域的一种可折叠、可柔性变形的压电触摸屏。该压电触摸屏包括柔性基板、压电薄膜、上电极和下电极，柔性基板放置于匹配的框架中，柔性基板的背面依次粘结有上电极、压电薄膜、下电极，上电极与下电极将压电薄膜划分成阵列式区域。在此基础上，另一种结构为柔性基板的背面依次粘结有上电极、第一压电薄膜、中部电极、第二压电薄膜和下电极。本发明的压电触摸屏可以随意变形、扭曲甚至折叠，仍然可以获得作用力位置、作用力大小、作用力运动轨迹等信息。且本压电触摸屏成本低、性能优异，极具市场竞争力。

Figure 201110308151

The invention discloses a foldable and flexible piezoelectric touch screen belonging to the technical field of piezoelectric touch screens. The piezoelectric touch screen includes a flexible substrate, a piezoelectric film, an upper electrode and a lower electrode. The flexible substrate is placed in a matching frame, and the back of the flexible substrate is sequentially bonded with an upper electrode, a piezoelectric film, and a lower electrode. Divide the piezoelectric film into arrayed regions. On this basis, another structure is that an upper electrode, a first piezoelectric film, a middle electrode, a second piezoelectric film and a lower electrode are sequentially bonded on the back of the flexible substrate. The piezoelectric touch screen of the present invention can be deformed, twisted or even folded at will, and information such as the location of the force, the magnitude of the force, and the trajectory of the force can still be obtained. Moreover, the piezoelectric touch screen has low cost, excellent performance and great market competitiveness.

Figure 201110308151

Description

But the piezoelectricity touch-screen of collapsible plastic deformation
Technical field
The invention belongs to piezoelectricity touch screen technology field, particularly a kind of back attaches the three dimensionality piezoelectricity touch-screen of array piezoelectric membrane, but and the collapsible plastic deformation of touch-screen, but operate as normal still after the distortion.
Background technology
Along with the development of infotech, man-machine interaction mode is not confined to traditional approachs such as mouse, keyboard, display yet.More convenience, fast, mode is just in the life of affect people's intuitively, wherein touch-screen is obtaining development rapidly as one of the most practical novel human-machine interaction mode over nearly 20 years.
Piezoelectric has played crucial effects on mechanics sensor, driver, this patent relates to a kind of brand-new piezoelectricity touch screen sensor technologies.
Compare with traditional electric capacity, resistive touch screen, the piezoelectricity touch-screen has following several respects significant advantage:
1, nonbinary response: the position that the piezoelectric type touch-screen not only can the perception contact, can also make response to this position amount of force, acting force variation characteristic, greatly improved the efficient of man-machine interaction.
2, material and the shape to the contact object do not have specific (special) requirements: because the piezoelectricity touch-screen is based on piezoelectric effect, no matter with the object of any material or Any shape to the screen effect, can make response; And and unlike traditional capacitance or resistance screen, requiring contact must be nonisulated plane or tip and hard object body.
3, good stable property:,, increase its stability so can greatly reduce piezoelectricity screen and extraneous contacting with under piezoelectric attaching and the screen because piezoelectric property is not limited to and acts on the close contact in source.
4, lower cost: the piezoelectricity screen is through the computing method location, and manufacturing process is simple.Through rational arranged, can reach the bearing accuracy that can compare favourably with capacitance plate again.The piezoelectricity screen need not transparent material in addition, can select the starting material that performance is better, cost is lower for use.
If 5 is compound with flexible display screen and piezoelectric ceramic film; Can form arbitrary deformation, distortion even folding flexible touch screen, promptly display screen self-deformation, distortion in addition folding after still can judge relevant informations such as force position, amount of force, acting force movement locus.
Existing piezoelectricity touch-screen is not also supported folding and plastic deformation.Simultaneously; Because the piezoelectricity touch-screen is a kind of new-type man-machine interactive; Touch accurate perception contact position information or touch size information, but the piezoelectricity touch-screen still has a lot of new functions to be found and excavate by the technician, such as: when finger or other any contactant (electric conductor, electrical insulator all can); Perhaps lift the moment of leaving screen surfaces on the surface that touches screen; Piezoelectric ceramics surface electric charge formation speed is different with disappearance speed near the contact, i.e. faster then electric charge generation of the speed of touch action or the speed that disappears are fast more, and the speed of slower then electric charge generation of the speed of touch action or disappearance is slow more.The present invention is based on a large amount of experiments, find the speed that this electric charge generates or disappears, also can use the variation of the detected voltage in piezoelectric ceramics surface to characterize, promptly rising edge and the negative edge with voltage waveform characterizes.Based on the essential characteristic that above-mentioned electric charge generates, the piezoelectricity touch screen of this patent has been given new functions of use.Except through the detection of the position of said charge generation, size is judged contact position and the amount of force function; The speed that can also detect the electric charge formation speed simultaneously also calculates; Obtain the information of further said acting force movement locus relevant information, acting force pace of change and speed and slidingly wipe action speed information etc., thereby realize more accurately and more real interactive capability.
Summary of the invention
But the present invention proposes still can operate as normal after a kind of collapsible plastic deformation and the distortion the piezoelectricity touch-screen, be the three dimensionality piezoelectricity touch-screen that a kind of back attaches the array piezoelectric membrane.Not only the advantage of touch-screens such as current collection appearance, resistance also has the inducing function to press degree, makes man-machine interaction freely convenient.
But 1, the piezoelectricity touch-screen of collapsible plastic deformation; This piezoelectricity touch-screen comprises substrate (display screen panel), piezoelectric membrane, top electrode and bottom electrode; Wherein, the flexible base, board (display screen panel) of deformation for taking place in said substrate, and flexible base, board is positioned in the framework of coupling; The back side of flexible base, board is bonded with top electrode, piezoelectric membrane, bottom electrode successively, and top electrode and bottom electrode are divided piezoelectric membrane in the zone that forms array.
The polarised direction of said piezoelectric membrane is parallel to the film normal direction.
It is quadrate array, rectangular array, regular hexagon array, Triangular array, circular array or fan-shaped array etc. that said top electrode and said bottom electrode are divided the array zone that forms with piezoelectric membrane.
When electrode design is comparatively complicated, can the charge signal of electrode be drawn through the circuit board that is arranged in the framework.
A kind of design proposal is: top electrode is identical with the surface size of piezoelectric membrane, and bottom electrode sticks on the lower surface of piezoelectric membrane, and is the array distribution of m * n, and wherein, m is the columns of bottom electrode, and n is the line number of bottom electrode, m >=2, n >=2.
Another kind of design proposal is: the strip bottom electrode that the m sheet is parallel to each other, vertically distributes is bonded in the lower surface of piezoelectric membrane; The n sheet is parallel to each other, the strip top electrode of cross direction profiles is bonded in the upper surface of piezoelectric membrane, piezoelectric membrane is divided formed rectangle or quadrate array, wherein m >=2; N >=2; Said top electrode turns over the lower surface that causes said piezoelectric membrane under the edge, forms under the top electrode and turns over the zone, in order to the circuit board in the connecting frame.
Said piezoelectric membrane can for the macromolecule piezoelectric membrane (vinylidene fluoride, PVDF) or photoetching composite piezoelectric material (PVDF and PZT particulate composite) film.
When piezoelectric membrane was the macromolecule piezoelectric membrane, the bonding mode of top electrode and flexible base, board can be common bonding mode (like the AB glue bond) or welding manner or some adhesive curing mode.
When piezoelectric membrane was photoetching composite piezoelectric material film, the bonding mode of top electrode and flexible base, board can be sputter or common bonding mode.
But 2, the piezoelectricity touch-screen of the collapsible plastic deformation of another kind of structure: this piezoelectricity touch-screen comprises flexible base, board, first piezoelectric membrane, middle electrode, second piezoelectric membrane, top electrode and bottom electrode; Wherein, Flexible base, board is positioned in the framework of coupling; The back side of flexible base, board is bonded with top electrode, first piezoelectric membrane, middle electrode, second piezoelectric membrane and bottom electrode successively, and top electrode, middle electrode and bottom electrode are divided the zone that forms array with first piezoelectric membrane and second piezoelectric membrane.
The polarised direction of said first piezoelectric membrane, second piezoelectric membrane is parallel to the film normal direction.
When electrode design is comparatively complicated, can the charge signal of electrode be drawn through the circuit board that is arranged in the framework.
Said top electrode, middle electrode and bottom electrode are quadrate array, rectangular array, regular hexagon array, Triangular array, circular array or fan-shaped array etc. with the array zone of first piezoelectric membrane and second piezoelectric membrane division formation.
A kind of design proposal is: the strip bottom electrode that the m sheet is parallel to each other, vertically distributes is bonded in the lower surface of second piezoelectric membrane, posts middle electrode at the second piezoelectric membrane upper surface, posts first piezoelectric membrane at the middle electrode upper surface; The n sheet is parallel to each other, the strip top electrode of cross direction profiles is bonded in the upper surface of first piezoelectric membrane; First piezoelectric membrane and second piezoelectric membrane measure-alike, the area of middle electrode is slightly less than the area of first piezoelectric membrane (or second piezoelectric membrane), m >=2; N >=2; Turn under the edge of top electrode to the second piezoelectric membrane lower surface, form under the top electrode and turn over the zone, turn under the edge of middle electrode to the second piezoelectric membrane lower surface; Form under the middle electrode and turn over the zone, in order to the circuit board in the connecting frame.
Said first piezoelectric membrane and second piezoelectric membrane can for the macromolecule piezoelectric membrane (vinylidene fluoride, PVDF) or photoetching composite piezoelectric material (PVDF and PZT particulate composite) film.
When first piezoelectric membrane and second piezoelectric membrane were the macromolecule piezoelectric membrane, the bonding mode of top electrode and flexible base, board can be common bonding mode (like the AB glue bond) or welding manner or some adhesive curing mode.
When first piezoelectric membrane and second piezoelectric membrane were photoetching composite piezoelectric material film, the bonding mode of top electrode and flexible base, board can be sputter or common bonding mode.
Principle of work of the present invention is: when the front of said flexible base, board (display screen panel) receives perpendicular to the acting force on said flexible base, board surface; Said flexible base, board will take place with said force position (x, y), said amount of force (F), said acting force touching or lift speed, said acting force glide direction or the relevant small amplitude flexural deformation of sliding speed on flexible base, board.Said distortion makes the piezoelectric membrane (is first piezoelectric membrane and second piezoelectric membrane for structure 2) at said flexible base, board back that the strain perpendicular to said flexible base, board normal direction take place.Because piezoelectric effect, said piezoelectric membrane will be parallel to said flexible base, board normal direction generation electric field, and on the said electrode on said piezoelectric membrane surface, produce electric charge.Through contact position (x is judged in the position of said charge generation, the detection of size; Y) and outside amount of force (F) function; The speed that can also detect the electric charge formation speed simultaneously also calculates; Obtain the information of further said acting force movement locus relevant information, acting force pace of change and speed and slidingly wipe action speed information etc., thereby realize more accurately and more real interactive capability.
Said flexible base, board, electrode and piezoelectric membrane can arbitrary deformations, distortion even collapsible, do not influence flexible screen and normally use, and form flexible display screen.Distortion, distortion in addition folding after screen still can obtain relevant information such as said force position, said amount of force, said acting force movement locus.
Said top electrode and said bottom electrode are opaque electrode (like aluminium electrode, silver electrode or copper electrode etc.) or transparency electrode.
Said flexible base, board is that display screen panel can be Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display screen.
Beneficial effect of the present invention is: the piezoelectricity touch-screen can arbitrary deformation, distortion even folding; But operate as normal still; Can with flexible Organic Light Emitting Diode (the Organic Light-Emitting Diode of present a new generation; OLED) display screen good fit, and the present invention still can obtain information such as force position, amount of force, acting force movement locus in distortion, distortion even after folding.This piezoelectricity touch screen structure has novelty and cost is low, excellent performance, has the market competitiveness.
Description of drawings
Fig. 1 is the sectional view of the embodiment of the invention 1;
Fig. 2 is the embodiment of the invention 1 an output end voltage signal;
Fig. 3 receives hum pattern for the embodiment of the invention 1 host computer;
Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are respectively upward view (concealing framework), stereographic map (concealing framework) and the explosive view (concealing framework) of the embodiment of the invention 1;
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are respectively upward view (concealing framework), stereographic map (concealing framework) and the explosive view (concealing framework) of the embodiment of the invention 2;
Fig. 6 (a), Fig. 6 (b) and Fig. 6 (c) are respectively upward view (concealing framework), stereographic map (concealing framework) and the explosive view (concealing framework) of the embodiment of the invention 3;
Fig. 7 (a) and Fig. 7 (b) are respectively the stereographic map (concealing framework) of the embodiment of the invention 4, the stereographic map (concealing framework) after the plastic deformation.
Label among the figure:
The 1-framework; 2-flexible base, board (display screen panel); The 3-top electrode; The 4-piezoelectric membrane; 4a-first piezoelectric membrane; 4b-second piezoelectric membrane; The 5-bottom electrode; The 6-adhesive glue; Turn over the zone under the 7-top electrode; The 8-middle electrode; Turn over the zone under the 9-middle electrode.
Embodiment
Following embodiment can make those skilled in the art more comprehensively understand the present invention, but does not limit the present invention in any way.
Embodiment 1
Fig. 1 is the sectional view of present embodiment, and Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) are respectively upward view (concealing framework), stereographic map (concealing framework) and the explosive view (concealing framework) of present embodiment.The piezoelectricity touch-screen comprises flexible base, board 2, piezoelectric membrane 4, top electrode 3 and bottom electrode 5, wherein:
In size is that square piezoelectric membrane 4 downsides of 54mm * 54mm, thickness 0.1mm post 93 * 3 square Copper Foil bottom electrodes 5 that distribute, and the size of Copper Foil bottom electrode 5 is 10mm * 10mm, spacing 5mm, thickness 0.07mm; At piezoelectric membrane 4 upsides the square Copper Foil top electrode 3 of size for 54mm * 54mm, thickness 0.07mm arranged.Top electrode 3 is sticking mutually with flexible base, board 2 through adhesive glue 6.
Flexible base, board 2 is positioned in the framework 1 of coupling; Piezoelectric membrane is the PVDF piezoelectric membrane; Flexible base, board 2 is the PVC material substrate; Flexible base, board 2 can adopt the OLED display screen in practical application, the PVC material substrate is close with the OLED display screen because of mechanical property, replaces the OLED display screen so choose the PVC material substrate in the present embodiment.
When the front of said flexible base, board 2 receives acting force; Can produce flexural deformation in the relevant position; Then make this position piezoelectric membrane produce strain; Because piezoelectric effect can produce electric charge on the top electrode (3) on piezoelectric membrane surface and the bottom electrode (5), top electrode 3 leads to charge signal in the external test circuitry through lead-in wire with bottom electrode 5.
Voltage-time curve after the charge signal that Fig. 2 produces for piezoelectric membrane amplifies via elementary operational amplifier.Wherein ordinate is amplifier out voltage (millivolt), and horizontal ordinate is time (microsecond).Fig. 2 reflected the monolithic piezoelectric film in the unit scan period because outside electric charge and time relation of pushing generation.Based on the essential characteristic that above-mentioned electric charge generates, the piezoelectricity touch screen of this patent has been given new functions of use.Except through the detection of the position of said charge generation, size is judged contact position and the amount of force function; The speed that can also detect the electric charge formation speed simultaneously also calculates; Obtain the information of further said acting force movement locus relevant information, acting force pace of change and speed and slidingly wipe action speed information etc., thereby realize more accurately and more real interactive capability.After the charge signal that Fig. 3 produces for piezoelectric membrane is handled via external circuit, single-chip microcomputer etc., finally be delivered to the digital signal-time curve of PC.Wherein ordinate is the digital signal (0-255,8) after the analog to digital conversion, and horizontal ordinate is time (second).Fig. 3 reacted the monolithic piezoelectric film in a plurality of scan periods because the outside electric charge of generation and the real-time relation of time of pushing.Following protuberance is divided into the response when screen applied external force, and upper convex portion is divided into the response when removing external force.Fig. 3 applies moment with external force is withdrawn moment through analog signal conversion is become after the digital signal in external force, the pace of change demonstration of this external force more obvious and clear.It is fast more that the external force touch screen is perhaps withdrawn the speed of screen, and then the waveform of following convex portion and epirelief part is steep more among Fig. 3, and the peak is sharp-pointed more.
Embodiment 2
Fig. 5 (a), Fig. 5 (b) and Fig. 5 (c) are respectively upward view (concealing framework), stereographic map (concealing framework) and the explosive view (concealing framework) of the embodiment of the invention 2.The piezoelectricity touch-screen comprises flexible base, board 2, piezoelectric membrane 4, top electrode 3 and bottom electrode 5, wherein:
In size is that square piezoelectric membrane 4 downsides of 54mm*54mm, thickness 0.1mm post 20 rectangle Copper Foil bottom electrodes 5 that are parallel to each other, vertically distribute, and the size of Copper Foil bottom electrode 5 is 54mm*2mm, spacing 0.5mm, thickness 0.07mm; Piezoelectric membrane 4 upsides post 20 be parallel to each other, the rectangle Copper Foil top electrode 3 of cross direction profiles; The size of Copper Foil top electrode 3 is 54mm*2mm, spacing 0.5mm, thickness 0.07mm; And turn under the edge with Copper Foil top electrode 3; Form and turn over zone 7 under the top electrode, in order to the circuit board in the connecting frame 1.Top electrode 3 is sticking mutually with flexible base, board (display screen panel) 2 through adhesive glue 6.
Flexible base, board 2 is positioned in the framework 1, is provided with circuit board in the framework 1, and this circuit board is drawn the charge signal on 40 copper foil electrodes.
Embodiment 3
Fig. 6 (a), Fig. 6 (b) and Fig. 6 (c) are respectively upward view (concealing framework), stereographic map (concealing framework) and the explosive view (concealing framework) of present embodiment.The piezoelectricity touch-screen comprises flexible base, board 2, the first piezoelectric membrane 4a, middle electrode 8, the second piezoelectric membrane 4b, top electrode 3 and bottom electrode 5.The back side of flexible base, board is bonded with top electrode 3, the first piezoelectric membrane 4a, middle electrode 8, the second piezoelectric membrane 4b and bottom electrode 5 successively, wherein:
In size is that the square second piezoelectric membrane 4b downside of 54mm*54mm, thickness 0.1mm posts 20 rectangle Copper Foil bottom electrodes 5 that are parallel to each other, vertically distribute, and the size of Copper Foil bottom electrode 5 is 54mm*2mm, spacing 0.5mm, thickness 0.07mm; Stick the rectangle Copper Foil middle electrode 8 of size at the second piezoelectric membrane 4b upside for 52mm*50mm, thickness 0.07mm; And turn under the edge with Copper Foil middle electrode 8 to the lower surface of the second piezoelectric membrane 4b; Form and turn over zone 9 under the middle electrode, in order to the circuit board in the connecting frame 1; Post the square first piezoelectric membrane 4a of size at Copper Foil middle electrode 8 upsides for 54mm*54mm, thickness 0.1mm; The first piezoelectric membrane 4a upside post 20 be parallel to each other, the rectangle Copper Foil top electrode 3 of cross direction profiles; The size of Copper Foil top electrode 3 is 52mm*2mm, spacing 0.5mm, thickness 0.07mm; And turn over the lower surface that causes the second piezoelectric membrane 4b under the edge with Copper Foil top electrode 3; Form and turn over zone 7 under the top electrode, in order to the circuit board in the connecting frame 1.Top electrode 3 sticks on flexible base, board 2 through adhesive glue 6.
Flexible base, board 2 is that (Organic Light-Emitting Diode, OLED) display screen, display screen are positioned in the framework 1 of coupling Organic Light Emitting Diode, are provided with circuit board in the framework 1, and this circuit board is passed to cell phone mainboard with the charge signal on the electrode.
Embodiment 4
The piezoelectricity touch-screen comprises flexible base, board 2, the first piezoelectric membrane 4a, middle electrode 8, the second piezoelectric membrane 4b, top electrode 3 and bottom electrode 5.The back side of flexible base, board is bonded with top electrode 3, the first piezoelectric membrane 4a, middle electrode 8, the second piezoelectric membrane 4b and bottom electrode 5 successively.
In size is that the square second piezoelectric membrane 4b downside of 54mm*54mm, thickness 0.1mm posts 20 rectangle Copper Foil bottom electrodes 5 that are parallel to each other, vertically distribute, and the size of Copper Foil bottom electrode 5 is 54mm*2mm, spacing 0.5mm, thickness 0.07mm; Post the rectangle Copper Foil middle electrode 8 of size at the second piezoelectric membrane 4b upside, and turn under the edge with Copper Foil middle electrode 8, form and turn over zone 9 under the middle electrode, in order to the circuit board in the connecting frame for 52mm*50mm, thickness 0.07mm; Post the square first piezoelectric membrane 4a of size at Copper Foil middle electrode 8 upsides for 54mm*54mm, thickness 0.1mm; The first piezoelectric membrane 4a upside post 20 be parallel to each other, the rectangle Copper Foil top electrode 3 of cross direction profiles; The size of Copper Foil top electrode 3 is 52mm*2mm, spacing 0.5mm, thickness 0.07mm; And turn under the edge with Copper Foil top electrode 3; Form and turn over zone 7 under the top electrode, in order to the circuit board in the connecting frame.It is on the flexible base, board 2 of 0.2mm that top electrode 3 sticks at thickness through adhesive glue 6.
Piezoelectric membrane is the PVDF piezoelectric membrane, and flexible base, board 2 is the PVC material substrate, and Fig. 7 (a) and Fig. 7 (b) are respectively the stereographic map (concealing framework) of present embodiment, the stereographic map (concealing framework) after the plastic deformation.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.

Claims (10)

1.可折叠、可柔性变形的压电触摸屏，其特征在于：该压电触摸屏采用结构一或结构二；1. A foldable and flexible piezoelectric touch screen, characterized in that: the piezoelectric touch screen adopts structure 1 or structure 2; 结构一：压电触摸屏包括基板、压电薄膜(4)、上电极(3)和下电极(5)，其中，所述基板为可发生形变的柔性基板(2)，柔性基板(2)放置于框架(1)中，柔性基板(2)的背面依次为上电极(3)、压电薄膜(4)和下电极(5)，上电极(3)与下电极(5)将压电薄膜(4)划分形成阵列式区域；Structure 1: The piezoelectric touch screen includes a substrate, a piezoelectric film (4), an upper electrode (3) and a lower electrode (5), wherein the substrate is a deformable flexible substrate (2), and the flexible substrate (2) is placed In the frame (1), the back of the flexible substrate (2) is an upper electrode (3), a piezoelectric film (4) and a lower electrode (5), and the upper electrode (3) and the lower electrode (5) connect the piezoelectric film (4) Divide and form an array area; 结构二：压电触摸屏包括柔性基板(2)、第一压电薄膜(4a)、中部电极、第二压电薄膜(4b)、上电极(3)和下电极(5)，其中，柔性基板(2)放置于框架(1)中，柔性基板(2)的背面依次为上电极(3)、第一压电薄膜(4a)、中部电极(8)、第二压电薄膜(4b)和下电极(5)，所述上电极(3)、中部电极(8)及下电极(5)将第一压电薄膜(4a)和第二压电薄膜(4b)划分形成阵列式的区域。Structure 2: The piezoelectric touch screen includes a flexible substrate (2), a first piezoelectric film (4a), a middle electrode, a second piezoelectric film (4b), an upper electrode (3) and a lower electrode (5), wherein the flexible substrate (2) Placed in the frame (1), the back of the flexible substrate (2) is the upper electrode (3), the first piezoelectric film (4a), the middle electrode (8), the second piezoelectric film (4b) and The lower electrode (5), the upper electrode (3), the middle electrode (8) and the lower electrode (5) divide the first piezoelectric film (4a) and the second piezoelectric film (4b) to form arrayed regions. 2.根据权利要求1所述的压电触摸屏，其特征在于：当所述柔性基板(2)的正面受到作用力时，上电极(3)和下电极(5)上会产生电荷，通过对所述电荷产生的位置、大小的检测来判断触点位置和作用力大小，通过检测电荷生成速度的快慢并加以计算，获得进一步的作用力运动轨迹相关的信息、作用力变化速度和快慢的信息以及滑擦动作快慢信息，从而实现人机交互。2. The piezoelectric touch screen according to claim 1, characterized in that: when the front of the flexible substrate (2) is subjected to a force, charges will be generated on the upper electrode (3) and the lower electrode (5), through the The detection of the position and size of the charge generation is used to judge the position of the contact point and the magnitude of the force. By detecting the speed of charge generation and calculating it, further information related to the movement track of the force, the change speed and speed of the force are obtained. And the speed information of the sliding action, so as to realize human-computer interaction. 3.根据权利要求1所述的压电触摸屏，其特征在于：结构一中所述上电极(3)与所述下电极(5)将压电薄膜(4)划分形成的阵列区域为正方形阵列、长方形阵列、正六边形阵列、正三角形阵列、圆形阵列或扇形阵列；3. The piezoelectric touch screen according to claim 1, characterized in that: in the first structure, the array area formed by dividing the piezoelectric film (4) by the upper electrode (3) and the lower electrode (5) is a square array , rectangular array, regular hexagonal array, regular triangular array, circular array or fan-shaped array; 结构二中所述上电极(3)、中部电极(8)及下电极(5)将第一压电薄膜(4a)和第二压电薄膜(4b)划分形成的阵列区域为正方形阵列、长方形阵列、正六边形阵列、正三角形阵列、圆形阵列或扇形阵列。The array area formed by dividing the first piezoelectric film (4a) and the second piezoelectric film (4b) by the upper electrode (3), the middle electrode (8) and the lower electrode (5) in structure two is a square array, a rectangular Array, Regular Hexagonal Array, Regular Triangular Array, Circular Array, or Sector Array. 4.根据权利要求1所述的压电触摸屏，其特征在于：对于结构一：上电极(3)与压电薄膜(4)的表面尺寸相同，下电极(5)粘贴在压电薄膜(4)的下表面，且呈m×n的阵列分布，其中，m为下电极(5)的列数，n为下电极(5)的行数，m≥2，n≥2。4. The piezoelectric touch screen according to claim 1, characterized in that: for structure one: the upper electrode (3) has the same surface size as the piezoelectric film (4), and the lower electrode (5) is pasted on the piezoelectric film (4) ) and is distributed in an m×n array, where m is the number of columns of the lower electrode (5), n is the number of rows of the lower electrode (5), m≥2, n≥2. 5.根据权利要求1所述的压电触摸屏，其特征在于：对于结构一：m片相互平行、纵向分布的长条形下电极(5)粘结在压电薄膜(4)的下表面，n片相互平行、横向分布的长条形上电极(3)粘结在压电薄膜(4)的上表面，将压电薄膜(4)划分形成长方形或正方形阵列，其中，m≥2，n≥2。5. The piezoelectric touch screen according to claim 1, characterized in that: for structure one: m strip-shaped lower electrodes (5) parallel to each other and longitudinally distributed are bonded to the lower surface of the piezoelectric film (4), n strip-shaped upper electrodes (3) parallel to each other and distributed laterally are bonded to the upper surface of the piezoelectric film (4), and the piezoelectric film (4) is divided to form a rectangular or square array, wherein, m≥2, n ≥2. 6.根据权利要求1所述的压电触摸屏，其特征在于：对于结构二：m片相互平行、纵向分布的长条形下电极(5)粘结在第二压电薄膜(4b)的下表面，n片相互平行、横向分布的长条形上电极(3)粘结在第一压电薄膜(4a)的上表面，第一压电薄膜(4a)和第二压电薄膜(4b)的尺寸相同，中部电极(8)的面积略小于第一压电薄膜(4a)的面积，m≥2，n≥2。6. The piezoelectric touch screen according to claim 1, characterized in that: for the second structure: m strip-shaped lower electrodes (5) parallel to each other and longitudinally distributed are bonded to the bottom of the second piezoelectric film (4b). On the surface, n pieces of strip-shaped upper electrodes (3) parallel to each other and distributed laterally are bonded on the upper surface of the first piezoelectric film (4a), the first piezoelectric film (4a) and the second piezoelectric film (4b) have the same size, the area of the middle electrode (8) is slightly smaller than the area of the first piezoelectric film (4a), m≥2, n≥2. 7.根据权利要求5所述的压电触摸屏，其特征在于：所述上电极(3)边缘下翻引至所述压电薄膜的下表面，形成上电极下翻区域(7)。7. The piezoelectric touch screen according to claim 5, characterized in that: the edge of the upper electrode (3) is turned down to the lower surface of the piezoelectric film to form an upper electrode turned down region (7). 8.根据权利要求6所述的压电触摸屏，其特征在于：所述上电极(3)边缘下翻引至所述第二压电薄膜(4b)的下表面，形成上电极下翻区域(7)。所述中部电极(8)的边缘下翻至第二压电薄膜(4b)下表面，形成中部电极下翻区域(9)。8. The piezoelectric touch screen according to claim 6, characterized in that: the edge of the upper electrode (3) is turned down to the lower surface of the second piezoelectric film (4b), forming an upper electrode turned down region ( 7). The edge of the middle electrode (8) is turned down to the lower surface of the second piezoelectric film (4b), forming a turned down region (9) of the middle electrode. 9.根据权利要求1所述的压电触摸屏，其特征在于：所述压电薄膜(4)、第一压电薄膜(4a)和第二压电薄膜(4b)为高分子压电薄膜或光刻复合压电材料薄膜。9. The piezoelectric touch screen according to claim 1, characterized in that: the piezoelectric film (4), the first piezoelectric film (4a) and the second piezoelectric film (4b) are polymer piezoelectric films or Photolithographic composite piezoelectric material thin films. 10.根据权利要求1所述的压电触摸屏，其特征在于：所述柔性基板(2)为有机发光二极管显示屏。10. The piezoelectric touch screen according to claim 1, characterized in that the flexible substrate (2) is an OLED display.
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