A dynamic and static combined electroluminescent flexible screen, preparation method and system

Abstract

The present invention discloses a dynamic and static combined electroluminescent flexible screen, preparation method, and system. The screen comprises, from top to bottom, an upper emitting layer, a bridging layer, a lower emitting layer, and an electrode layer. The upper emitting layer utilizes a sliding electroluminescent film, while the lower emitting layer utilizes a pressing electroluminescent film. An isolation ring layer is provided between the bridging layer and the lower emitting layer, so that when the lower emitting layer is under pressure, the lower emitting layer can contact the bridging layer and emit light. The upper emitting layer is bonded to the bridging layer, and the lower emitting layer is bonded to the electrode layer. The luminescent flexible screen can achieve both upper-layer sliding triboelectric electroluminescence and lower-layer pressing contact electroluminescence.

Description

Technical Field

[0001] The present invention relates to the technical field of electroluminescent flexible screens, and in particular to a dynamic and static combined electroluminescent flexible screen, a preparation method and a system. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Flexible electroluminescent screens can be used for information hiding and encryption, selective information transmission, and intelligent human-computer interaction. They utilize patterned bottom electrodes or emissive layers to display information in real time. This pattern can be designed as numbers or letters, surpassing traditional physical encryption methods and potentially applicable to commercial and military information encryption.

[0004] Flexible electroluminescent screens can display patterns using a bridging medium or frictional surface, and can also control external power sources to display patterns. This improves the reliability of information encryption and addresses the problem of traditional sensors used in human-computer interaction lacking light signal response, which limits their operation at night. Furthermore, most flexible electroluminescent screens can be placed on clothing or on other parts of the body, such as the chest, arms, wrists, knees, and back, enhancing the feasibility of human-computer interaction.

[0005] However, the inventors discovered that existing electroluminescent devices can only display patterns by rubbing or pressing, resulting in a single operation method and low luminous intensity and clarity, making them difficult to meet the diverse requirements of information encryption. Specifically, electroluminescent devices that display patterns by rubbing or sliding are difficult to use for long-term static displays, such as QR codes and barcodes, because the information they convey is transient. Electroluminescent devices that display patterns by pressing can statically display patterns and other information, but they lack dynamic interactive information and cannot display a portion of the pattern. Summary of the Invention

[0006] In order to solve the above problems, the present invention proposes a dynamic and static combined electroluminescent flexible screen, preparation method and system, which can display the pattern on the electrode layer by friction sliding, and can also display the pattern on the electrode layer by pressing, realizing diversified information interaction.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] First, a dynamic and static combined electroluminescent flexible screen is proposed, comprising, from top to bottom, an upper emission layer, a bridging layer, a lower emission layer, and an electrode layer;

[0009] The upper emission layer uses a sliding electroluminescent film; the lower emission layer uses a pressing electroluminescent film; an isolation layer is set between the bridge layer and the lower emission layer. When the lower emission layer is under pressure, the lower emission layer can contact the bridge layer and emit light;

[0010] The upper emission layer is attached to the bridge layer, and the lower emission layer is attached to the electrode layer.

[0011] In the second aspect, a method for preparing a dynamic and static combined electroluminescent flexible screen proposed in the first aspect is proposed, comprising:

[0012] An upper emission layer is prepared by sliding the electroluminescent film;

[0013] The lower emission layer is prepared by pressing the electroluminescent film;

[0014] Prepare a bridging layer and an isolation ring layer;

[0015] Laminating the upper emission layer onto the bridging layer;

[0016] Placing the bridge layer on the lower emission layer, and placing an isolation ring layer between the bridge layer and the lower emission layer;

[0017] The lower emission layer is attached to the electrode layer.

[0018] Thirdly, a trolley control system is proposed, including:

[0019] The first aspect proposes a dynamic and static combined electroluminescent flexible screen, which is used to generate corresponding pressing or sliding signals according to the operator's pressing or sliding operation;

[0020] The controller uses a multi-level switch model to generate a switch array signal based on the sliding signal, and determines the driving direction of the car based on the switch array signal; the pressure sensor array model generates a pressure array signal based on the pressing signal, and determines the driving speed of the car based on the pressure array signal; the car is controlled according to the driving direction and speed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention adheres the upper emission layer to the bridging layer, places the bridging layer on the lower emission layer, and provides an isolation ring layer between the bridging layer and the lower emission layer, and adheres the lower emission layer to the electrode layer. It is achieved that the pattern on the electrode layer can be displayed by performing a friction sliding operation on the upper emission layer or a pressing operation on the lower emission layer, thereby realizing diversified information interaction.

[0023] 2. The present invention adds MXene nanomaterials to the upper emission layer, which can enhance the luminescence effect, increase the luminescence intensity, and thus improve the clarity of the pattern display.

[0024] 3. The present invention sets a microstructure on the upper surface of the upper emission layer, which can increase the potential difference generated by the upper emission layer when the upper emission layer is slid, effectively improving the luminous intensity and the clarity of the pattern display.

[0025] 4. The addition of BaTiO3 nanomaterials to the lower emission layer of the present invention can enhance the dielectric constant and alternating electric field strength of the lower emission layer, thereby improving the luminous intensity and clarity of pattern display.

[0026] 5. The present invention adds glycerol and salt to the bridging layer, which can improve the conductivity of the bridging layer and further improve the luminous intensity and clarity of the pattern display.

[0027] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0029] Figure 1 The overall structural diagram of the flexible screen disclosed in Example 1;

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the flexible screen disclosed in Example 1;

[0031] FIG3( a ) is a flow chart of the preparation of the upper emission layer disclosed in Example 1;

[0032] FIG3( b ) is a flow chart of the preparation of the lower emission layer disclosed in Example 1;

[0033] Figure 4 This is a surface image of the upper emission layer microstructure disclosed in Example 1;

[0034] Figure 5 is a cross-sectional view of the upper emission layer microstructure disclosed in Example 1;

[0035] Figure 6 The graph of the response of the electroluminescent power density of the lower emission layer to different AC voltages disclosed in Example 1 is as follows;

[0036] Figure 7 The response curve of the electroluminescent power density of the upper emission layer to different sliding frequencies disclosed in Example 1 is as follows;

[0037] Figure 8 This is a diagram showing the actual response when the bridging layer and the lower emitting layer disclosed in Example 1 are attached;

[0038] Figure 9This is a diagram showing the actual response when sliding the upper emission layer disclosed in Example 1;

[0039] Figure 10 This is a schematic diagram of the trolley control system disclosed in Example 3;

[0040] Figure 11 This is a simulation diagram of the system controlling the car to move forward at high speed according to Example 3;

[0041] Figure 12 This is a simulation diagram of the system controlling the car to move backward at medium speed according to Example 3;

[0042] Figure 13 This is a simulation diagram of the system controlling the car to move to the left at a low speed according to Example 3;

[0043] Figure 14 This is a simulation diagram of the system controlling the car to move to the right at medium speed according to Example 3;

[0044] Figure 15 This is a simulation diagram of the system controlling the vehicle to stop motion in Example 3.

[0045] Among them: 1. Upper emission layer, 2. PET substrate, 3. Bridging layer, 4. Isolation ring layer, 5. Lower emission layer, 6. Electrode layer, 7. Packaging substrate, 8. Wire. DETAILED DESCRIPTION

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0048] Example 1

[0049] In this embodiment, a dynamic and static combined electroluminescent flexible screen is disclosed, such as Figure 1 、 Figure 2 As shown, it includes, from top to bottom, an upper emitting layer 1, a bridging layer 3, a lower emitting layer 5, and an electrode layer 6; the upper emitting layer adopts a sliding electroluminescent film, and the lower emitting layer 5 adopts a pressing electroluminescent film; an isolation ring layer 4 is provided between the bridging layer 3 and the lower emitting layer 5, so that when the lower emitting layer 5 is under pressure, the lower emitting layer 5 can contact the bridging layer 3 and emit light;

[0050] The upper emission layer 1 is attached to the bridge layer 3 , and the lower emission layer 5 is attached to the electrode layer 6 .

[0051] The sliding electroluminescent film uses a silicone rubber matrix, into which electroluminescent powder and MXene nanomaterials are added. The addition of MXene nanomaterials to the sliding electroluminescent film enhances the luminescence effect and increases the luminous intensity, thereby improving the clarity of the pattern displayed.

[0052] In order to improve the luminous intensity, a plurality of microstructures are provided on the upper surface of the upper emission layer, and the lower surface of the upper emission layer is adhered to the bridging layer.

[0053] By setting the microstructure, the potential difference generated by the upper emission layer can be increased when the upper emission layer is slid, thereby effectively improving the luminous intensity and the clarity of the pattern display.

[0054] The microstructure can be a convex structure or a concave-convex structure. The convex structure includes a cone structure, a pyramid structure, and a dome structure, and the concave-convex structure includes a sandpaper structure and a biological leaf structure.

[0055] The microstructure on the upper emission layer is produced by a template method, and the template used is an inverted microstructure copper template produced by laser marking.

[0056] In specific implementation, the sliding electroluminescent film is based on silicone rubber Ecoflex00-30, and electroluminescent powder of ZnS:Cu particles and a small amount of single-layer MXene nanomaterials are added to the matrix. ZnS:Cu particles are the main materials for electroluminescence, and MXene nanomaterials mainly play a role in enhancing the luminous effect. Silicone rubber Ecoflex00-30 is the main carrier of the triboelectric effect and the matrix of the film material. The surface of Ecoflex00-30 has microstructured protrusions to enhance the triboelectric effect. Figure 4 As shown, the raised microstructures on the surface of the silicone rubber are arranged in a regular pattern. The bottom diameter of the inverted microstructure on the copper template used to prepare the upper emission layer is 100 μm. Therefore, the bottom diameter of the raised part of the microstructure on the prepared upper emission layer is 99-101 μm, and the height of the raised part of the microstructure is 40-50 μm. The size of the microstructure can be changed and selected according to actual use requirements.

[0057] The cross section of the upper emission layer is observed to obtain Figure 5 The cross-sectional view shown, through Figure 5 As shown in the cross-sectional view of the upper emission layer, a large number of ZnS:Cu particles and a small amount of single-layer MXene nanomaterials are wrapped in the silicone rubber matrix, confirming the material prepared for the upper emission layer disclosed in this embodiment.

[0058] A silicone rubber matrix film is grown on a PET substrate 2 using a spin coating process to prepare an upper emission layer. A large number of ZnS:Cu particles and a small amount of a single layer of MXene nanomaterial are encapsulated in the silicone rubber matrix, as shown in Figure 3(a). The process of preparing the upper emission layer includes:

[0059] 1.0 g of Ecoflex00-30 agent A was taken, 1.0 g of Ecoflex00-30 agent B was taken, and mixed with agent A. Then, 0.8 g of electroluminescent powder and 2 mg of single-layer MXene nanomaterial were added to the mixture to obtain a composite silicone rubber reagent;

[0060] The composite material silicone rubber reagent was quickly rotated and stirred in a homogenizer for 30 seconds at a speed of about 3000 r / min, and then slowly stirred manually for about half an hour to obtain a uniformly mixed reagent;

[0061] A composite film of about 500 microns thick was grown on the PET substrate 2 using a spin coating process using a uniformly mixed reagent to prepare an uncured sliding electroluminescent film. The film was placed in a vacuum box for defoaming treatment and then a copper template with an inverted microstructure was attached. The film was placed in an oven at 80°C for 5 hours, the copper template was taken out and peeled off to obtain a cured sliding electroluminescent film containing the PET substrate 2, which was then cut to obtain an upper emission layer 1 containing the PET substrate 2.

[0062] The bridging layer 3 is prepared using an ionic hydrogel, which is used as the main conductive material of the bridging layer. Sodium acrylate, N,N-methylenebisacrylamide, sodium persulfate, N,N,N',N'-tetramethylethylenediamine, salt, and glycerol are added to deionized water in sequence, and chemical reactions occur in sequence to form a hydrogel under the cross-linking effect of functional groups. The ionic hydrogel contains glycerol and salt, wherein the salt is NaCl and LiCl. The main function of adding salt is to enhance the conductivity of the hydrogel, and the main function of adding glycerol is to retain the moisture of the hydrogel.

[0063] The isolation ring layer can be made of PDMS, polyurethane (PU), thermoplastic polyurethane elastomer rubber (TPU) or acrylonitrile-butadiene-styrene copolymer (ABS) material.

[0064] The specific process of preparing the bridging layer 3 and the isolation ring layer 4 is as follows:

[0065] Take 8.0g of deionized water and add 2.5g of acrylamide to it. After magnetic stirring for 5min, 5mg of N,N-methylenebisacrylamide and 5mg of sodium persulfate were added, and magnetic stirring was continued for another 5min. Finally, 10μL of N,N,N`,N`-tetramethylethylenediamine liquid was dropped into the solution, as well as 0.5g of NaCl and 0.5g of LiCl. After magnetic stirring for 5min, 2g of glycerol was added and mixed to obtain a hydrogel composite liquid.

[0066] Since the composite liquid is easy to aggregate and difficult to make into a thin film, a layer of film about 1 mm thick is dropped on the culture dish and placed horizontally in an 80-degree Celsius oven for 2 hours to react and cross-link, obtaining a transparent ionic hydrogel film with good stretchability. The bridging layer is obtained through the ionic hydrogel film.

[0067] A 2 mm thick PDMS membrane was prepared by mixing silicone rubber (PDMS) and a crosslinker in a mass ratio of 10:1. The membrane was vacuum-degassing and then dried at 80°C in a Petri dish. The membrane was then cut into a ring using a pair of scissors to create an isolation ring.

[0068] By attaching the ionic hydrogel to the isolation layer, the bridging layer is attached to the isolation layer.

[0069] The lower emission layer adopts a pressed electroluminescent film, which uses PVDF-HFP as a base film, and electroluminescent powder and dielectric material are added to the base film.

[0070] Among them, the electroluminescent powder here is preferably ZnS:Cu particles, and the dielectric material is preferably BaTiO3 particles. The electroluminescent powder ZnS:Cu particles are the main material for bridging luminescence, and the main function of the dielectric material BaTiO3 particles is to enhance the dielectric constant and alternating electric field strength of the emission layer, thereby improving the luminous brightness and the clarity of the pattern display.

[0071] The specific process of preparing the lower emission layer is shown in Figure 3(b), including:

[0072] Weigh 0.55 g of polytetrafluoroethylene-hexafluoropropylene (PVDF-HFP) particles and add them to 3 ml of NN' dimethylformamide (DMF) solution, weigh 0.5 g of electroluminescent powder ZnS:Cu and add it to the mixed solution, then weigh 0.5 g of dielectric material BaTiO3 and add it to the mixed solution to obtain a composite solution.

[0073] The composite solution was magnetically stirred at a speed of 1000 r / min for 10 h, and then ultrasonically dispersed for 1 h to obtain a viscous liquid.

[0074] A viscous liquid is scraped onto a glass plate using a doctor blade method to obtain a thin film with a thickness of tens to 100 microns. The film is then dried in an oven at 80°C to obtain a lower emission layer.

[0075] The electrode layer 6 includes a substrate and patterned electrodes disposed on the substrate, and the electrodes are connected to the wires 8 .

[0076] To fabricate the patterned electrodes, pre-prepared MXene ink was screen-printed onto a PET substrate. The MXene single-layer nanomaterial was obtained by etching aluminum titanium carbide with hydrofluoric acid to create a multilayer MXene nanomaterial. This was followed by washing, ultrasonication, multiple centrifugation steps, and freeze-drying. 270 mg of the single-layer MXene nanomaterial was mixed with 3 ml of deionized water, and two drops of single-walled carbon nanotube liquid were added to enhance crosslinking. The resulting MXene ink was then dispersed ultrasonically.

[0077] Furthermore, the choice of electrodes can be flexibly designed according to needs, and the electrode materials can also be conductive tape, aluminum electrodes, copper electrodes, or silver electrodes, etc. The electrode pattern can also be flexibly designed according to needs, and is not limited to MXene ink-printed interdigitated electrodes.

[0078] The lower emission layer is placed on the electrode layer to obtain a static electroluminescent layer.

[0079] The static electroluminescent layer film is isolated from the bridging layer by an isolation ring layer, wherein the bridging layer is placed on the lower emission layer. The patterned electrode is displayed only when and only when the bridging layer contacts the lower emission layer under the action of external force.

[0080] The upper emission layer is bonded to the bridge layer, the upper surface of the electrode layer is bonded to the lower emission layer, and the lower surface of the electrode layer is packaged with the substrate 7 to prepare an electroluminescent flexible screen that combines sliding display and pressing display.

[0081] In addition to polyethylene terephthalate (PET), the substrate in this embodiment may also be made of polyvinylidene fluoride (PVDF), poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)), poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)), polytetrafluoroethylene (PTFE), polyimide (PI), polyvinyl chloride (PVC), polyvinyl pyrrolidone (PVP), polymethyl methacrylate (PMMA) or polyethylene naphthalate (PEN).

[0082] This embodiment discloses the luminous mechanism of the luminous flexible screen. Figure 8 、 Figure 9 As shown in the figure, when the external force presses the lower emission layer, the bridging layer is completely attached to the lower emission layer, and the external alternating current of the electrode layer will make the luminous flexible screen produce stable blue-green light. This is mainly due to the two parts of the patterned electrodes tightly attached to the lower emission layer. The two parts of the patterned electrodes refer to two parts in the same layer of electrodes that are not connected to each other. These two parts are used to connect the two ends of the AC power supply, that is, the live wire and the neutral wire respectively; for example, when the electrode is a forked electrode, such as Figure 8As shown, there are two parts on the left and right that are not connected to each other. When the patterned electrode is connected to an alternating current but is not in contact with the bridging layer, although there is an alternating electric field in the lower emission layer, the electric field strength is too small to make the electroluminescent powder ZnS:Cu particles in the lower emission layer have high-energy electrons, and there are no high-energy electrons colliding with the luminescence center, and no luminescence phenomenon occurs. When the patterned electrode is connected to an alternating current and a conductive bridging layer is attached to the lower emission layer, the upper bridging layer will also induce a corresponding alternating current, which greatly increases the electric field strength between the bridging layer and the electrode, and the lower emission layer in the interlayer will also have an alternating electric field. Of course, the intensity of the alternating electric field is less than the electric field strength between the two unconnected parts of the patterned electrode, but it is sufficient to make the electric field strength, under the enhancement of the dielectric material, generate high-energy electrons in the electroluminescent powder ZnS:Cu particles, and the high-energy electrons repeatedly collide with the luminescence center in the alternating electric field, which makes Zn 2+ Leave the original position, generate holes, Cu 2+ The hole position will be filled, energy level transition will occur, and energy will be emitted in the form of light energy, producing blue-green light visible to the human eye.

[0083] As the finger continuously slides over the upper emission layer, the upper emission layer will generate blue-green light following the finger. The main mechanism is that when the finger or other materials are passed over the silicone rubber material, due to the electrostatic induction and friction electrification effect, a higher potential difference is instantly generated where the finger passes. This potential difference is between the ZnS:Cu particles and the surrounding silicone rubber. MXene nanomaterials have good conductivity and high edge density. Friction makes it easier for electrons to transfer, thus increasing the potential difference. This instantaneous potential difference generates instantaneous high-energy electrons. The movement of the same high-energy electrons hits the luminescence center, causing the ZnS:Cu particles in the microscopic world to 2+ Movement, generating holes, Cu 2+ The filled hole position produces energy level transition and releases light energy, which is emitted as visible blue light or blue-green light.

[0084] The flexible screen disclosed in this embodiment is a combination of upper sliding friction electroluminescence and lower pressing contact electroluminescence. In essence, the luminescence mechanism of both is that high-energy electrons in electroluminescent ZnS:Cu particles collide with the luminescence center.

[0085] This example also tests the response of the proposed flexible screen's electroluminescence intensity to changes in various parameters, including measurements of static electroluminescence under pressure and dynamic electroluminescence under sliding.

[0086] Measurement 1: This measurement uses a light detector to measure blue light with a wavelength of 450nm to verify the change of luminous power density with applied voltage, such as Figure 6As shown in the figure, when the electrodes of the flexible screen device are connected to a fixed 50Hz sinusoidal AC power supply, and the device is subjected to external force so that the bridging layer is completely attached to the lower emission layer, the luminous power density of the device increases with the increase of the external voltage. From the measured fitting curve, it can be seen that the tangent slope of the curve increases with the increase of voltage, that is, increasing the voltage also increases the increase in luminous power density. In addition, from the measurement results, it can be seen that the initial voltage of luminescence under the drive of 50Hz AC is about 70V. Under the condition of applying 50Hz, 300V sinusoidal AC, the luminous power density of the device exceeds 0.4μw / cm 2 , luminous effects such as Figure 8 Shown is completely clear and visible.

[0087] Measurement 2: This measurement uses an optical probe to measure the change in the luminous power density of the emitting layer with different sliding frequencies under a contact force of 10N on nylon material. The optical power density at a wavelength of 450nm was tested with sliding frequencies ranging from 1Hz to 10Hz; Figure 7 As shown in Figure 1, under the above conditions, the luminous power density of the upper emission layer increases with the increase of the applied frequency. However, unlike measurement 1, the luminous power density increase decreases with the increase of the sliding frequency. At a sliding frequency of 10 Hz, the luminous power density of the device is close to 0.4 μW / cm 2 This is mainly related to the saturation sliding luminescence limit of the device. When the sliding frequency is too high, the friction potential generated per unit area remains basically stable, causing the luminous power density of the upper emission layer to gradually approach stability.

[0088] It should be noted that the luminous power density of different bands under a voltage of 220V is additionally measured to verify how the static luminous power density of the device changes with light of different bands. The device electrodes are externally connected to a fixed 50Hz, 220V sinusoidal AC power supply, and the light detector is adjusted to measure the light power density of different wavelengths. The luminous power density of the device at a fixed voltage first increases and then decreases with increasing wavelength, and the peak line is approximately 450nm, that is, the luminous power density of the device is mainly concentrated in blue light, and there are also light components of other bands such as purple light and red light. However, the main color of the luminous power is blue-green light or blue light.

[0089] This example uses a controlled variable method to measure the main parameters influencing luminescence characteristics. It was found that the primary factor affecting the luminescence of the lower emissive layer is the voltage of the applied alternating current. The primary factors affecting the luminescence of the upper emissive layer are the frequency of friction and the pressure at the friction contact point. This also demonstrates that the flexible light-emitting screen disclosed in this example can generate both dynamic electroluminescence through sliding and static electroluminescence through pressure.

[0090] Example 2

[0091] In this embodiment, a method for preparing a dynamic and static combined electroluminescent flexible screen disclosed in Example 1 is disclosed, comprising:

[0092] An upper emission layer is prepared by sliding the electroluminescent film;

[0093] The lower emission layer is prepared by pressing the electroluminescent film;

[0094] Prepare a bridging layer and an isolation ring layer;

[0095] Laminating the upper emission layer onto the bridging layer;

[0096] Placing the bridge layer on the lower emission layer, and placing an isolation ring layer between the bridge layer and the lower emission layer;

[0097] The lower emission layer is attached to the electrode layer.

[0098] Example 3

[0099] In this embodiment, a trolley control system is disclosed, including:

[0100] The first embodiment discloses a dynamic and static combined electroluminescent flexible screen, which is used to generate corresponding pressing or sliding signals according to the operator's pressing or sliding operation;

[0101] The controller uses a multi-level switch model to generate a switch array signal based on the sliding signal, and determines the driving direction of the car based on the switch array signal; the pressure sensor array model generates a pressure array signal based on the pressing signal, and determines the driving speed of the car based on the pressure array signal; the car is controlled according to the driving direction and speed.

[0102] The controller includes a core MCU module and a slave MCU module. The controller is mounted on a car with wheels and turn signals. The controller is connected to the electroluminescent flexible screen, receives sliding or pressing signals from the electroluminescent flexible screen, analyzes the signals, determines the driving direction and speed of the car, and controls the car according to the determined driving direction and speed.

[0103] The electroluminescent flexible screen is made into a large-area array to form a combined electroluminescent screen, which can display a variety of pressing and sliding signals.

[0104] For example, if nine electroluminescent flexible screens are combined in a rectangular array to form a combined electroluminescent screen, the controller constructs a multi-level switch model and a pressure sensor array model based on the array of the nine electroluminescent flexible screens. The pressure sensors in the pressure sensor array model correspond one-to-one to the electroluminescent flexible screens, and the ports in the multi-level switch model correspond one-to-one to four of the electroluminescent flexible screens.

[0105] The multi-stage switch model includes four ports, port one, port two, port three and port four. When sliding to the electroluminescent flexible screen corresponding to the port, the port is closed and disconnected at other times. The four ports can be closed and disconnected according to the operator's sliding direction, thereby generating different switch array signals. The controller can determine the closed and open status of each port based on the switch array signal, and then determine the driving direction of the car. Specifically: when all four ports are disconnected, the car stops; when port one is closed, the car is determined to go straight (front); when port two is closed, the car is determined to go backward (back); when port three is closed, the car is determined to turn left (left); when port four is closed, the car is determined to turn right (right).

[0106] The pressure sensor array model contains nine pressure sensors. When the flexible screen is pressed, the pressure sensor corresponding to the flexible screen generates a pressure signal. The controller determines the driving speed of the car based on the pressure signal generated by the pressure sensor. Specifically: the driving speed of the car is divided into 0, first gear, second gear and third gear. When none of the nine pressure sensors are pressed, that is, no pressure signal is generated, the driving speed of the car is 0; when one to three pressure sensors are pressed, that is, one to three sensors generate pressure signals, the driving speed of the car is the first gear; when four to six of the pressure sensors are pressed, that is, four to six sensors generate pressure signals, the driving speed of the car is the second gear; when seven to nine pressure sensors are pressed, that is, seven to nine pressure sensors generate pressure signals, the driving speed of the car is the third gear; the speeds of the first, second and third gears can be set according to actual needs, such as 10km / h, 30km / h and 50km / h respectively.

[0107] In specific implementation, the upper emission layer of the electroluminescent flexible screen is a triboelectric sensor. When a finger rubs against it, the electrode generates a triboelectric signal, which can be regularized through rectification and filtering. When the finger slides, the upper emission layer array will generate array signals with different timings according to the sliding direction, which can distinguish the four directions of front, back, left and right. A multi-pole switch is used in the slave MCU module to simulate the array signal. The closure of the multi-pole switch indicates the sliding direction of the upper emission layer array. Figure 10 As shown, the four sliding directions are simulated by a four-port switch.

[0108] The lower emission layer of the electroluminescent flexible screen is a sensor that senses the properties of alternating current, similar to a capacitor sensor working under alternating current. When the bridge layer contacts the lower emission layer, the bridge layer generates an alternating current signal. Similarly, the AC signal can be regularized through rectification and filtering. When the lower emission layer array is pressed by external force, it will generate a corresponding module pressure array signal, and the threshold value will be used to determine how many modules in the array are under force. Figure 10As shown in the figure, a pressure sensor is used in the slave MCU module to simulate the array signal. When the pressure sensor is subjected to force, it generates a regular voltage-stabilized signal, which represents the induced AC signal of the lower emission layer under the action of external force. Each pressure sensor is connected to an LED light for intuitively judging the array pressing state. When the pressure sensor generates a pressure signal, the LED light connected to the pressure sensor lights up. Figure 10 As shown, the pressing of the lower emission layer array is simulated by pressing the pressure sensor array and turning the LED array on and off.

[0109] like Figure 11 As shown in the figure, for the device side, the pressure array signal collected by the pressure sensor array and the switch array signal generated by the multi-pole switch are both transmitted to the core MCU module for signal processing to determine the driving speed and direction of the car.

[0110] The core MCU module is preferably an AT89C52 single-chip microcomputer, and the slave MCU module is preferably an ADC0808 chip. The core MCU module and the slave MCU module communicate using a serial port.

[0111] The analog signal of the pressure sensor array is digitized by the ADC0808 chip, and the digital signal is connected to the I / O port of the core MCU. The core MCU determines whether the input pressure signal is a press signal. When the input pressure signal is greater than or equal to the set threshold of 2000N, it is determined to be a press signal, the press operation is valid, and the driving speed is determined based on the pressure array signal.

[0112] like Figure 11 As shown in the figure, for the car side, an AT89C52 microcontroller processes the switch array and pressure array signals input from its serial port. First, the car is represented by four-wheel drive wheels and turn signals. The microcontroller processes the switch array signals to determine the driving direction and turns on the corresponding turn signals through the I / O port. Then, the microcontroller processes the pressure array signals to determine the driving speed.

[0113] After a 10s delay, the car is started for 10s. In addition, the car controller is also connected to a liquid crystal display screen, which is used to display the car's speed (0, 10km / h, 30km / h or 50km / h) and direction (front, back, left or right), preferably an LCD1602 liquid crystal display screen.

[0114] like Figure 11As shown in the figure, when all pressure sensors are pressed and the multipole switch is set to port 1, all LED array lights turn on. The ADC0808 and its MCU transmit the signal via the serial port to the AT89C52 MCU. After processing by the AT89C52, the headlights turn on. After a delay, the wheels rotate at 50 km / h for 10 seconds, and the LCD1602 displays "50 km / h, front".

[0115] like Figure 12 As shown in the figure, when the six pressure sensors are pressed and the multipole switch is set to port 2, the six small LED array lights turn on. The ADC0808 and its MCU transmit the signal via the serial port to the AT89C52 MCU. After processing, the AT89C52 turns on the taillights. After a delay, the wheels rotate at 30 km / h for 10 seconds, and the LCD1602 displays "30 km / h, back".

[0116] like Figure 13 As shown in the figure, when the three pressure sensors are pressed and the multipole switch is set to port 3, the three small LED array lights turn on. The ADC0808 and its MCU transmit the signal via the serial port to the AT89C52 MCU. After processing, the AT89C52 turns on the left light. After a delay, the wheels rotate at 10 km / h for 10 seconds, and the LCD1602 displays "10 km / h, left".

[0117] like Figure 14 As shown in the figure, when the six pressure sensors are pressed and the multipole switch is set to port 4, the six small LED array lights turn on. The ADC0808 and its MCU transmit the signal via the serial port to the AT89C52 MCU. After processing, the AT89C52 turns on the right light. After a delay, the wheels rotate at 30 km / h for 10 seconds, and the LCD1602 displays "30 km / h, right".

[0118] like Figure 15 As shown in the figure, when neither sensor is pressed and the multi-pole switch is unused, all LED array lights are off. The ADC0808 and its MCU transmit signals via the serial port to another AT89C52 MCU. After processing by the AT89C52, all turn signals are turned off, the wheels are stationary at 0 km / h, and the LCD1602 displays "0 km / h, stop."

[0119] In addition, the core MCU module is not limited to the AT89C52 microcontroller, but can also be other types of microcontrollers, embedded development boards such as Arduino and ESP8266 development boards, FPGAs, and host computers, etc. The display mode can also be changed from LCD to digital tubes, etc.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A dynamic and static combined electroluminescent flexible screen, characterized in that: It includes an upper emission layer, a bridging layer, a lower emission layer and an electrode layer from top to bottom; The upper emission layer adopts a sliding electroluminescent film; The lower emission layer adopts a press-type electroluminescent film; an isolation ring layer is set between the bridge layer and the lower emission layer. When the lower emission layer is under pressure, the lower emission layer can contact the bridge layer and emit light; The upper emission layer is attached to the bridge layer, and the lower emission layer is attached to the electrode layer.

2. The dynamic and static combined electroluminescent flexible screen according to claim 1, characterized in that: The sliding electroluminescent film is based on silicone rubber, and electroluminescent powder and MXene nanomaterials are added to the matrix.

3. The dynamic and static combined electroluminescent flexible screen according to claim 1, characterized in that: A plurality of microstructures are arranged on the upper surface of the upper emission layer, and the lower surface of the upper emission layer is attached to the bridging layer.

4. The dynamic and static combined electroluminescent flexible screen according to claim 3, characterized in that: The microstructure is a convex structure or a concave-convex structure.

5. The dynamic and static combined electroluminescent flexible screen according to claim 1, characterized in that: The press electroluminescent film uses PVDF-HFP as the base film, and electroluminescent powder and dielectric materials are added to the base film.

6. The dynamic and static combined electroluminescent flexible screen according to claim 1, characterized in that: The electrode layer includes a substrate and patterned electrodes arranged on the substrate, and the electrodes are connected to the wires.

7. The dynamic and static combined electroluminescent flexible screen according to claim 1, characterized in that: The bridging layer is made of ionic hydrogel containing glycerol and salt.

8. The dynamic and static combined electroluminescent flexible screen according to claim 1, characterized in that: The upper surface of the electrode layer is attached to the lower emission layer, and the lower surface of the electrode layer encapsulates the substrate.

9. The method for preparing a dynamic and static combined electroluminescent flexible screen according to any one of claims 1 to 8, characterized in that: include: An upper emission layer is prepared by sliding the electroluminescent film; The lower emission layer is prepared by pressing the electroluminescent film; Prepare a bridging layer and an isolation ring layer; Laminating the upper emission layer onto the bridging layer; Placing the bridge layer on the lower emission layer, and placing an isolation ring layer between the bridge layer and the lower emission layer; The lower emission layer is attached to the electrode layer.

10. A trolley control system, characterized in that: include: A dynamic and static combined electroluminescent flexible screen according to any one of claims 1 to 8, which is used to generate corresponding pressing or sliding signals according to the pressing or sliding operation of the operator; The controller uses a multi-level switch model to generate a switch array signal based on the sliding signal, and determines the driving direction of the car based on the switch array signal; the pressure sensor array model generates a pressure array signal based on the pressing signal, and determines the driving speed of the car based on the pressure array signal; the car is controlled according to the driving direction and speed.

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