A flexible electroluminescent device with touch function
By introducing a high-capacitance capacitor layer and a signal feedback control chip into the touch screen, the integration of thin-film electroluminescence and touch screen is realized, solving the problems of complex, heavy and inflexible structure of existing touch screen devices, and achieving a flexible and bendable touch effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI KERUN PHOSPHOR TECH
- Filing Date
- 2026-03-12
- Publication Date
- 2026-06-12
AI Technical Summary
Existing touch screen devices are complex, bulky, and cannot be folded or bent, limiting their area and making it impossible to integrate thin-film electroluminescence with touch screens.
A thin-film electroluminescent screen is connected in series with a frequency converter and a switching power supply. The capacitor layer is formed by a mixture of barium titanate and mica powder to increase the capacitance and sensitivity. The signal feedback control chip realizes the touch function. The capacitor feedback layer is composed of a smooth and dense plastic film coated with a metal layer. The transparent conductive layer is insulated from the back conductive layer.
It achieves the integration of thin-film electroluminescence and touch screen, is flexible and bendable, and the capacitive feedback layer improves sensitivity and reduces environmental absorption, making it suitable for a variety of application scenarios.
Smart Images
Figure CN122195286A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of flexible electroluminescent display technology applications. Technical Background
[0002] Existing touch screens mainly include capacitive screens, resistive screens, infrared matrix screens, and pressure-sensitive conductive screens. They are used in flat panel displays, electrical switches, mobile phone screens, instrument control buttons, and other fields, and are important media for human-computer interaction. The light emission of these display devices and touch switches is provided by the backlight of the screen. They are formed by multi-layer superimposed complex structures, combined with LED light guide illumination or OLED backlight display, which makes the device structure functional, process complex and heavy, and cannot be folded or bent, and the area is limited.
[0003] This invention discloses a flexible electroluminescent device with touch functionality. Utilizing the principle of capacitance change upon touch and a signal feedback control chip, it integrates thin-film electroluminescence with a touch screen. The device comprises a thin-film electroluminescent screen, a frequency converter, and a switching power supply. The thin-film electroluminescent screen sequentially includes: a base layer, a transparent conductive layer, an electroluminescent layer, a capacitor layer, a back conductive layer, an insulating layer, and a capacitor feedback layer. The frequency converter includes a flicker control chip, a transformer, and circuitry. When the thin-film electroluminescent screen, the frequency converter, and the switching power supply are connected in series, touching any area of the thin-film electroluminescent screen with a human finger causes a change in capacitance, which is transmitted to the flicker control chip, automatically generating various flicker modes.
[0004] The present invention discloses a flexible thin-film light-emitting and touch-control integrated device, which is thin, light and flexible, and can be widely used in electrical switches, advertising, lighting, automobiles, displays, instruments, meters, safety lighting, clothing and other fields. Summary of the Invention
[0005] A flexible electroluminescent device with touch function includes a thin-film electroluminescent screen 13, a frequency converter driver 11, and a switching power supply 12. The thin-film electroluminescent screen sequentially includes: a base layer 1, a transparent conductive layer 2, an electroluminescent layer 3, a capacitor layer 4, a back conductive layer 5, an insulating layer 6, and a capacitor feedback layer 7. The frequency converter driver 11 includes a flashing control chip, a transformer, and circuitry. When the lead electrodes 8-9 of the thin-film electroluminescent screen are connected in series with the frequency converter driver and the switching power supply, and a human finger touches any area of the thin-film electroluminescent screen, the capacitance change of the flexible thin-film electroluminescent screen is conducted to the flashing control chip, and the light emission state will control the generation of various flashing modes.
[0006] This invention utilizes the basic structure of alternating current electroluminescence to increase capacitance and sensitivity. It employs the principle of capacitance change caused by touch and a signal feedback control chip to achieve the integration of thin-film electroluminescence and touch screen. The capacitor layer in this invention is formed by coating a high-capacitance material, which is a mixture of barium titanate and mica powder. These materials possess the basic high dielectric constant of electroluminescence and also satisfy capacitance sensitivity. Using mica powder alone would reduce the electroluminescence intensity.
[0007] The capacitive feedback layer 7 set in the thin-film electroluminescent screen of the present invention can increase the sensitivity of the reflection amplification capacitance change and reduce environmental absorption. The capacitive feedback layer 7 is composed of a smooth and dense plastic film coated with a metal layer. The metal layer needs to be set independently and cannot be connected to the electrode.
[0008] The thin-film electroluminescent screen 13 of this invention is prepared by fabricating an ITO transparent conductive layer 2 on a PET film base layer 1; printing an electroluminescent layer 3 on all or part of the surface of the transparent conductive layer, with partial printing resulting in localized light emission from the pattern; printing a capacitor layer 4 on all surfaces of the electroluminescent layer and the transparent conductive layer, the capacitor layer insulating the transparent conductive layer from the back conductive layer; completely covering the back conductive layer 5 on the surface of the capacitor layer; completely covering the surface of the back conductive layer with an insulating layer 6; completely covering the surface of the insulating layer with a capacitor feedback layer 7; and finally sealing with a transparent plastic encapsulation layer 10; and leading out electrodes 8-9 at the edges of the transparent conductive layer and the back conductive layer. The insulating layer 6 is an insulating ink or an insulating plastic film. The transparent plastic encapsulation layer 10 is a PVC protective film, a plastic sealant, etc.
[0009] The frequency converter driver in this invention consists of a transformer, inductor, flashing control chip, infrared remote control module, and circuitry. During operation, it converts 12V DC to 110V AC at a frequency of 400-800Hz. The frequency converter driver connects to a thin-film electroluminescent screen, forming AC electroluminescence. This invention utilizes a switching power supply to generate a potential drift difference in the frequency converter driver. Touching the thin-film electroluminescent screen changes its capacitance, and this capacitance change reshapes the driver's potential balance, causing the chip state to cyclically change, thereby controlling the light emission state of the thin-film electroluminescent screen.
[0010] The switching power supply in this invention consists of a transformer, filter, capacitor, frequency regulating chip, and circuitry. During operation, it converts 220V AC mains power to 12V DC. The inverter driver and switching power supply are connected in series to create the capacitive control flickering mechanism of this invention; however, integrating both can still achieve the same effect. The switching power supply matched to the inverter cannot be replaced by a DC battery. The frequency regulating chip in the switching power supply, the flickering control chip in the driver, and the remote control circuit form an amplified capacitor feedback signal for control. The flickering control chip is programmed with a flickering sequence and can be connected to a wireless remote control switch.
[0011] The electroluminescent layer in this invention is formed by coating with an alternating current electroluminescent material. This material is zinc sulfide doped with copper, erbium, and dysprosium activators, then sintered at high temperature, resulting in a particle size of 5-30 micrometers. Zinc sulfide-based electroluminescent materials can also be doped with manganese to produce orange light, but direct current emission cannot produce the touch-sensitive flickering effect. This luminescent material exhibits good capacitance.
[0012] The transparent conductive layer in this invention is one of ITO, a conductive polymer, or silver nanowires. The back conductive layer is one of ITO, a conductive polymer, silver paste, or copper paste. The electroluminescent layer and capacitor layer between the transparent conductive layer and the back conductive layer are both solid layers. The electroluminescent layer, capacitor layer, and back conductive layer in this invention can all be applied, printed, or coated with adhesives, and then cured by ultraviolet or infrared high-temperature heating.
[0013] The thin-film electroluminescent screen in this invention is one or more screens connected in parallel, and then connected in series with a frequency converter and a switching power supply. When any of the multiple thin-film electroluminescent screens is touched, the working state of the frequency converter's flashing control chip can be changed. Attached Figure Description
[0014] Figure 1. Structure diagram of thin-film electroluminescent touch screen Figure 2. Connection diagram of a flexible electroluminescent device with touch functionality. In the figures of this invention: 1. Base layer, 2. Transparent conductive layer, 3. Electroluminescent layer, 4. Capacitor layer, 5. Back conductive layer, 6. Insulating layer, 7. Capacitor feedback layer, 8. Transparent conductive layer electrode, 9. Back conductive layer electrode, 10. Encapsulation layer, 11. Variable frequency driver, 12. Switching power supply, 13. Thin film electroluminescent screen. Specific implementation methods
[0015] A flexible electroluminescent device with touch functionality includes a thin-film electroluminescent screen 13, a frequency converter driver 11, and a switching power supply 12, which are connected in series to form a thin-film electroluminescent touch device. The thin-film electroluminescent screen sequentially comprises: a base layer 1, a transparent conductive layer 2, an electroluminescent layer 3, a capacitor layer 4, a back conductive layer 5, an insulating layer 6, and a capacitor feedback layer 7. This sandwich structure provides stable integration. The frequency converter driver 11 includes a flashing control chip, a transformer, and circuitry. The leads 8-9 of the thin-film electroluminescent screen are connected to the output terminal of the frequency converter driver. The input terminal of the frequency converter driver is connected in series with the switching power supply. When a human finger touches any area of the thin-film electroluminescent screen, the change in capacitance is transmitted to the flashing control chip, which automatically generates various flashing cycle modes. The touch control effect of this invention is not limited to direct human contact; it can also achieve touch sensing effects when wearing gloves or with the surface covered by an obstruction. The capacitor layer of this invention is solid-state and can still provide sensing effects even without elastic pressure.
[0016] This invention utilizes the basic structure of an AC electroluminescent device, adding internal capacitance and sensitivity. Touch-induced capacitance changes, and a signal feedback control chip integrates thin-film electroluminescence with a touch screen. The capacitor layer in this invention is formed by coating a high-capacitance material, a mixture of barium titanate and mica powder. These materials possess the high dielectric constant essential for electroluminescence and satisfy capacitance sensing sensitivity. Using mica powder alone would reduce electroluminescence intensity; without it, capacitance sensitivity is low; and using traditional materials like titanium dioxide alone would significantly reduce sensitivity. Typically, the weight ratio of mica powder is greater than that of barium titanate, increasing capacitance by 3-5 times. The adhesive uses a mixture of acrylic resin, epoxy resin, fluoropolymer coating, and silicone rubber, and is uniformly printed and dried at 110 degrees Celsius.
[0017] The thin-film electroluminescent screen in this invention features a capacitive feedback layer 7, which amplifies capacitance changes, improves sensitivity, and reduces environmental absorption, thus making the application environment unrestricted by absorption. For example, in ground-based applications, the absence of the capacitive feedback layer would affect sensitivity. The capacitive feedback layer 7 is composed of a smooth, dense PET plastic film coated with a metal layer. This metal layer requires a separate protective film and cannot be connected to the electrodes.
[0018] The thin-film electroluminescent screen 13 of this invention is prepared by sputtering an ITO transparent conductive layer 2 onto a PET film base layer 1, or other transparent conductive materials. An electroluminescent layer 3 is printed on all or part of the surface of the transparent conductive layer; partial printing results in localized pattern emission, allowing for pattern design. Areas without an emission layer are completely covered by a capacitor layer. A capacitor layer 4 is printed on all surfaces of the electroluminescent and transparent conductive layers, insulating the transparent conductive layer from the back conductive layer. The back conductive layer 5 is completely covered on the surface of the capacitor layer. An insulating layer 6 completely covers the surface of the back conductive layer. A capacitor feedback layer 7 is completely covered on the surface of the insulating layer, and finally, a PVC transparent plastic encapsulation layer 10 is used for sealing. Electrodes 8-9 are led out from the edges of the transparent conductive layer and the back conductive layer. The thin-film electroluminescent screen is an AC electroluminescent device. Due to the use of capacitor-generating materials and capacitor-reinforcing structures, the electroluminescent screen has a larger capacitance. While structurally similar to electroluminescent devices, its function, principle, effect, and application differ.
[0019] The frequency converter driver in this invention consists of a transformer, inductor, flashing control chip, circuitry, and infrared remote control module. During operation, it converts 12V DC to 110V AC at 400-800Hz. The frequency converter driver connects to a thin-film electroluminescent screen, forming AC electroluminescence. The flashing control chip is programmed with a flashing sequence; for example, using a commercially available 590R chip or a DH100 / 12 / TB driver (Keyan Phosphorus), it can be connected to a wireless remote control switch. This allows for multiple control methods for the thin-film electroluminescent touch display device, including long-range infrared remote control and short-range touch control. The frequency converter driver with infrared remote control functionality increases touch sensitivity, broadening its applications. Touch control can also achieve a sensor-like effect. Commercially available capacitor control chips MTC202SE and MTC202ST can also be used for control.
[0020] The switching power supply in this invention consists of a transformer, filter, capacitor, frequency regulating chip, and circuitry. During operation, it converts 220V AC mains power to 12V DC, such as using a commercially available MP3030D power supply or an A1BY1201 switching power supply (Kerunephosphor). The frequency converter and switching power supply are connected in series to create the capacitive control flickering conditions described in this invention; however, integrating both can still achieve the desired effect.
[0021] The electroluminescent layer in this invention is formed by coating with an alternating current electroluminescent material. This material is zinc sulfide doped with copper, erbium, and dysprosium as activators. Rare earth elements stabilize the emission spectrum. It is then sintered at 600-1100 degrees Celsius, resulting in a particle size of 5-30 micrometers. Zinc sulfide electroluminescent materials can also be doped with manganese to produce orange light, but direct current emission cannot produce a touch-sensitive flickering effect. Commercially available models KPT / D513S (green), KPT / D502B (sky blue), KPT / D507S (blue-green), KPT / D417D (blue), KPT / D718S (orange), KPT / D830 (red), and KPT / D330B (white) can all be used to form multi-color electroluminescence. Rare earth doping in this luminescent material provides good capacitance.
[0022] The transparent conductive layer in this invention is one of ITO, a conductive polymer, or silver nanowires. The back conductive layer is one of ITO, a conductive polymer, silver paste, or copper paste. The electroluminescent layer and capacitor layer between the transparent conductive layer and the back conductive layer are both solid layers. The electroluminescent layer, capacitor layer, and back conductive layer in this invention can all be applied, printed, or coated with adhesives and then cured by ultraviolet or infrared high-temperature heating. The insulating layer in this invention protects the back conductive layer, making it insulated from the capacitor feedback reflection layer. The insulating layer uses conventional electronic component insulating ink or plastic.
[0023] The thin-film electroluminescent screen in this invention consists of one or more screens connected in parallel, and then connected in series with a frequency converter and a switching power supply. Touching any one of the multiple thin-film electroluminescent screens can change the operating state of the frequency converter's flashing control chip. The thin-film electroluminescent screen can be made into various shapes, colors, and patterns, and can also be fabricated into a transparent and controllable light-emitting device. The advantages of this invention are:
[0024] This invention relates to a flexible electroluminescent touch device that integrates thin-film electroluminescence with a touch screen. It is flexible, completely solid-state, impact-resistant, and unaffected by wave absorption interference. Its area can be multiplied by square meters. The surface of the device is completely insulated, preventing contamination from external electromagnetic fields, leakage current, lightning strikes, static electricity, etc., ensuring safe and reliable use. It is widely applicable in the fields of light emission, display, and illumination. This invention is thin, lightweight, and flexible, and can be widely used in electrical switches, advertising, consumer electronics, indicators and lighting, automobiles, displays, instruments, meters, safety warning lights, clothing, furniture, and other fields.
[0025] Having described the preferred embodiments of the present invention above, it should be understood by those skilled in the art that any changes and modifications made to the present invention without departing from its spirit and scope are within the scope of the present invention.
Claims
1. A flexible electroluminescent device with touch functionality, comprising a thin-film electroluminescent screen, a frequency converter driver, and a switching power supply; The thin-film electroluminescent screen comprises, in sequence: a base layer, a transparent conductive layer, an electroluminescent layer, a capacitor layer, a back conductive layer, an insulating layer, and a capacitor feedback layer; the frequency converter driver includes: a flashing control chip, a transformer, and circuitry; when the thin-film electroluminescent screen, the frequency converter driver, and the switching power supply are connected in series, when a human finger touches any area of the thin-film electroluminescent screen, the capacitance change of the thin-film electroluminescent screen is transmitted to the flashing control chip, and the light emission state will control the generation of various flashing modes.
2. A flexible electroluminescent device with touch functionality according to claim 1, characterized in that: The capacitor layer is formed by coating a high-capacitance material, which is a mixture of barium titanate and mica powder.
3. A flexible electroluminescent device with touch functionality according to claim 1, characterized in that: The capacitor feedback layer is composed of a smooth, dense plastic film coated with a metal layer.
4. A flexible electroluminescent device with touch functionality according to claim 1, characterized in that: The thin-film electroluminescent screen is made by preparing an ITO transparent conductive layer on a PET film base layer; printing an electroluminescent layer on all or part of the transparent conductive layer; printing a capacitor layer on all the electroluminescent layer and the transparent conductive layer surface; and then covering them with a back conductive layer, an insulating layer and a capacitor feedback layer respectively; and leading out electrodes at the edges of the transparent conductive layer and the back conductive layer.
5. A flexible electroluminescent device with touch functionality according to claim 1, characterized in that: A frequency converter driver consists of a transformer, inductor, flashing control chip, infrared remote control module, and circuit. When working, it converts DC 12V to AC 110V, 400-800Hz.
6. A flexible electroluminescent device with touch function according to claim 1, characterized in that: A switching power supply consists of a transformer, filter, capacitor, switching frequency regulating chip, and circuit. When working, it converts AC 220V to DC 12V.
7. A flexible electroluminescent device with touch function according to claim 1, characterized in that: The electroluminescent layer is formed by coating with alternating current electroluminescent material, which is zinc sulfide doped with copper, erbium, and dysprosium activators, and sintered at high temperature, with a particle size of 5-30 micrometers.
8. A flexible electroluminescent device with touch function according to claim 1, characterized in that: The transparent conductive layer is one of ITO or conductive polymer; the back conductive layer is one of ITO, conductive polymer, silver paste, or copper paste.
9. A flexible electroluminescent device with touch functionality according to claim 1, characterized in that: Thin-film electroluminescent screens consist of one or more screens connected in parallel, and then connected in series with a frequency converter and a switching power supply. Touching any one of the thin-film electroluminescent screens can change the operating state of the frequency converter's flashing control chip.