CN101271945A - Electroluminescent panel, its manufacturing method and electroluminescent display device - Google Patents

Abstract

The present invention relates to an electroluminescent panel. The electroluminescent panel includes: a transparent substrate; a transparent conductive film; a light emitting layer; a dielectric layer; an electrode layer formed using a thin sheet of an inexpensive metal; and an insulating layer. The invention also discloses a manufacturing method and application of the electroluminescent panel. Since the electroluminescent panel of the present invention and the method for manufacturing the same and the application thereof use inexpensive metal sheets as the material for forming the electrode layer, the manufacturing cost thereof can be greatly reduced. In addition, the invention adopts a new processing method, so that the effect of bidirectional light emission can be realized.

Description

Electroluminescence panel, manufacturing method thereof, and electroluminescence display device

technical field

The invention relates to an electroluminescent plate and a manufacturing method thereof, in particular to an electroluminescent plate with an electrode layer formed of cheap metal and a manufacturing method thereof.

Background technique

Electroluminescent panel (EL) is a very versatile device, which is often used in the following fields: (1) Liquid crystal (LCD) backlight, such as mobile phones, electronic dictionaries, handheld game instruments, keyboards, computers, telephones, Electronic scales, stereos, MP3, etc.; (2) Commodity backlights, such as safety vests, safety helmets, safety belts, clocks, watches, etc.; (3) Automobile industry, such as instrument panels, license plates, warning lights, etc.; (4) Signboards, Such as road signs, house numbers, escape signs, traffic signs, road dividers, posters, etc.; (5) Advertisements, such as buses, menu boards, subway car advertisements, advertising boxes, etc.; (6) Gift toys, such as photo frames, Christmas cards , Christmas decorations, stationery gifts, etc.; and (7) architectural decoration, such as elevator warning lines, wall lamp decorations, light switch displays, etc.

The electroluminescent panel has the following characteristics: uniform luminous surface; the light emitted is cold light, so it does not generate heat; light weight; extremely thin thickness, generally between 0.1 and 0.8 millimeters (mm); flexibility; easy to assemble; Vibration and impact resistance; low power consumption, the current density is generally 0.1 to 0.2 mA/cm2; good water resistance; its driving voltage is generally 40 to 200 volts of AC power (50 to 3000 Hz); the operating temperature is general The temperature is minus 35 to plus 85°C; the service life can exceed 8000 hours; the driving circuit can be a constant voltage source or a transformer (depending on the size of the EL); depending on the type of activator in the light-emitting layer, it can emit different The color of light can be white, blue-green, blue, dark blue, yellow-green, green, red, yellow, etc.; and single-color or multi-color light can be produced.

The electroluminescence panel is a multi-layer stack structure, from top to bottom: transparent substrate; transparent conductive film; light-emitting layer; dielectric layer; electrode layer; and insulating layer. There is an electrode on the upper and lower sides of the multilayer stack structure. The upper electrode is a transparent conductive film, such as indium tin oxide (ITO) film, from which light can be emitted upwards. The lower electrode is an electrode layer. The luminescent material contained in the luminescent layer is mainly It is zinc sulfide (ZnS). The luminescence principle of the luminescent layer is as follows: When an AC voltage is applied to the two electrodes, the electric field will cause the ZnS particles to undergo an excited transition, thereby emitting light in each charge-discharge cycle. The brightness of EL will change with the voltage and frequency between the electrodes. Generally, as the voltage and frequency increase, the brightness will increase accordingly.

However, the traditional electroluminescence plate is relatively expensive due to the use of conductive silver powder or carbon powder, silver glue or carbon glue (colloidal material containing silver particles or carbon particles) prepared by resin and solvent as the material for forming the electrode layer. High and the conductivity is reduced by doping the resin. In the process of forming an electroluminescent panel, the electrode layer is usually screen-printed with silver glue or carbon glue, and then baked.

Contents of the invention

In order to solve the disadvantages of the prior art, the present invention provides a relatively low-cost electroluminescent panel and a manufacturing method thereof.

An embodiment of the present invention provides an electroluminescence panel including a transparent substrate; a transparent conductive film; a light emitting layer; a dielectric layer; an electrode layer formed using a thin sheet of an inexpensive metal;

Another embodiment of the present invention provides an electroluminescence panel, which includes a first transparent substrate; a first transparent conductive film; a first light-emitting layer; a first dielectric layer; an electrode layer, which is formed by using cheap metal sheets; a second dielectric layer; a second light emitting layer; a second transparent conductive film; and a second transparent substrate.

Another embodiment of the present invention provides a method for manufacturing an electroluminescent panel, which includes the following steps: preparing a transparent substrate; forming a transparent conductive film under the transparent substrate; forming a light-emitting layer under the transparent conductive film ; forming a dielectric layer under the light emitting layer; forming an electrode layer under the dielectric layer using an inexpensive metal sheet; and forming an insulating layer under the electrode layer.

Another embodiment of the present invention provides a method for manufacturing an electroluminescent panel, which includes the following steps: preparing a first transparent substrate; forming a first transparent conductive film under the first transparent substrate; A first light-emitting layer is formed under a transparent conductive film; a first dielectric layer is formed under the first light-emitting layer; an electrode layer is formed by using a cheap metal sheet under the first dielectric layer; an electrode layer is formed under the electrode layer forming a second dielectric layer; forming a second light emitting layer under the second dielectric layer; forming a second transparent conductive film under the second light emitting layer; and forming a second transparent conductive film under the second transparent conductive film. Transparent substrate.

Another embodiment of the present invention provides an electroluminescent display device comprising the electroluminescent panel disclosed in the present invention.

Since the electroluminescent panel and its manufacturing method and its application of the present invention use cheap metal flakes as the material for forming the electrode layer, the manufacturing cost thereof can be greatly reduced. In addition, since the present invention adopts a new processing method, the effect of bidirectional light emission can be realized.

Description of drawings

1A to 1F are schematic views of the structure of an electroluminescent panel and its manufacturing method according to a first embodiment of the present invention.

2A to 2I are schematic views of the structure of an electroluminescent panel and its manufacturing method according to a second embodiment of the present invention.

Detailed ways

The invention will be described in more detail with reference to the accompanying drawings, which depict preferred embodiments for carrying out the invention. However, the present invention has been illustrated in several embodiments, but should not be limited to the described embodiments.

1A to 1F show an electroluminescence panel and a manufacturing method thereof according to a first embodiment of the present invention. Firstly, a transparent substrate 1 is provided, which can be a polyethylene terephthalate (PET) film or glass or other transparent plastic materials. Next, a transparent conductive film 2 is formed under the transparent substrate 1 , which can be an indium tin oxide (ITO), antimony tin oxide (ATO) film or a conductive polymer film to form a desired light-emitting shape. Next, the light emitting layer 3 is formed under the transparent conductive film 2 . Next, a dielectric layer 4 is formed under the light emitting layer 3 . Next, an electrode layer 5 is formed under the dielectric layer 4. The difference from the traditional electroluminescence plate is that the material for forming the electrode layer 5 is not printed and baked by screen printing using silver glue or carbon glue material containing silver particles. Instead, it is formed by using thin sheets of cheap metals (such as aluminum, tin, copper, iron, etc.) that are much cheaper than silver glue or carbon glue materials, thereby reducing the overall cost of the electroluminescent panel. Finally, an insulating layer 6 is formed under the electrode layer 5, and then the layers are laminated to form the electroluminescent plate. The so-called cheap metal in the present invention refers to a metal that is cheaper than silver glue or carbon glue material and has good ductility.

2A to 2I show an electroluminescent panel and a manufacturing method thereof according to a second embodiment of the present invention. Firstly, a first transparent substrate 11 is provided, which can be made of polyethylene terephthalate film, glass or transparent plastic. Next, a first transparent conductive film 12 is formed under the first transparent substrate 11 . Next, the first light emitting layer 13 is formed under the first transparent conductive film 12 . Next, a first dielectric layer 14 is formed under the first light emitting layer 13 . Next, an electrode layer 15 is formed under the first dielectric layer 14 using a thin sheet of an inexpensive metal (eg, aluminum, tin, copper, iron, etc.). Next, the difference between the conventional electroluminescent panel and the first embodiment of the present invention is that the second dielectric layer 16 is formed under the electrode layer 15 . Next, a second light emitting layer 17 is formed under the second dielectric layer 16 . Next, a second transparent conductive film 18 is formed under the second light emitting layer 17 . Finally, a second transparent substrate 19 is formed under the second transparent conductive film 18, and then the layers are laminated to form the electroluminescent panel.

The structure of this embodiment cannot be achieved by traditional electroluminescent panels. This is because the electrode layer of traditional electroluminescent panels uses silver glue or carbon glue as a material and is formed by screen printing and baking. So if When it is desired to make an electroluminescent panel with double-sided light emission, the solvent coated therein cannot be dried and volatilized, so the effect of double-sided light emission cannot be realized. However, since the electroluminescence panel of the present invention uses a thin sheet of an inexpensive metal (for example, aluminum, tin, copper, iron, etc.) to form the electrode layer and is formed in a press-bonding manner, a second dielectric layer, The second light emitting layer, the second transparent conductive film and the second transparent substrate. Compared with the structure of the traditional electroluminescent panel which can only emit light in one direction, the structure of this embodiment has the advantage of not only low cost, but also two-way (double-sided) light emission at the same time.

The electroluminescent panel disclosed by the present invention, its manufacturing method and its application device can greatly reduce its manufacturing cost because it uses cheap metal flakes as the material for forming the electrode layer. In addition, since the present invention adopts a new processing method, the effect of double-sided light emission can be realized.

The characteristics and technical content of the present invention have been fully disclosed above, and those skilled in the art can make various replacements or modifications without departing from the spirit of the present invention based on the disclosure and teaching of the present invention, so the protection scope of the present invention should not be limited to The disclosed embodiments are intended to cover such alternatives and modifications.

Claims (19)

1. An electroluminescent panel comprising: transparent substrate; transparent conductive film; luminous layer; dielectric layer; An electrode layer formed using inexpensive metal flakes; and Insulation. 2. The electroluminescent panel according to claim 1, wherein the inexpensive metal is aluminium, tin, copper or iron. 3. The electroluminescent panel according to claim 1, wherein the transparent substrate is polyethylene terephthalate, glass or translucent plastic. 4. The electroluminescence panel according to claim 1, wherein the transparent conductive film is an indium tin oxide film, an antimony tin oxide film or a conductive polymer film. 5. An electroluminescent panel comprising: a first transparent substrate; a first transparent conductive film; the first luminescent layer; a first dielectric layer; Electrode layers, which are formed using inexpensive metal flakes; second dielectric layer; second light-emitting layer; a second transparent conductive film; and second transparent substrate. 6. The electroluminescent panel according to claim 5, wherein the inexpensive metal is aluminium, tin, copper or iron. 7. The electroluminescent panel of claim 5, wherein the first and second transparent substrates are polyethylene terephthalate or glass. 8. The electroluminescent panel according to claim 5, wherein the first and second transparent conductive films are indium tin oxide films, antimony tin oxide films or conductive polymer films. 9. A method for manufacturing an electroluminescent panel, comprising the following steps: Prepare a transparent substrate; forming a transparent conductive film under the transparent substrate; forming a light emitting layer under the transparent conductive film; forming a dielectric layer under the light emitting layer; using inexpensive metal foils to form electrode layers below the dielectric layer; and An insulating layer is formed under the electrode layer. 10. The method of claim 9, wherein the inexpensive metal is aluminium, tin, copper or iron. 11. The method according to claim 9, wherein the transparent substrate is polyethylene terephthalate, glass or light-transmitting plastic. 12. The method according to claim 9, wherein the transparent conductive film is an indium tin oxide film, an antimony tin oxide film or a conductive polymer film. 13. The method according to claim 9, wherein the transparent substrate, the transparent conductive film, the light-emitting layer, the dielectric layer, the electrode layer, and the insulating layer are formed by pressing The electroluminescent panel. 14. A method for manufacturing an electroluminescent panel, comprising the following steps: preparing a first transparent substrate; forming a first transparent conductive film under the first transparent substrate; forming a first light-emitting layer under the first transparent conductive film; forming a first dielectric layer under the first light emitting layer; forming an electrode layer under said first dielectric layer using inexpensive metal foil; forming a second dielectric layer under the electrode layer; forming a second light emitting layer under the second dielectric layer; forming a second transparent conductive film under the second light emitting layer; and A second transparent substrate is formed under the second transparent conductive film. 15. The method of claim 14, wherein the inexpensive metal is aluminium, tin, copper or iron. 16. The method of claim 14, wherein the first and second transparent substrates are polyethylene terephthalate, glass, or light-transmitting plastic. 17. The method according to claim 14, wherein the first and second transparent conductive films are indium tin oxide films, antimony tin oxide films or conductive polymer films. 18. The method according to claim 14, wherein the first transparent substrate, the first transparent conductive film, the first light-emitting layer, the first dielectric layer, the electrode layer, the The second dielectric layer, the second light-emitting layer, the second transparent conductive film, and the second transparent substrate form the electroluminescent plate in a press-bonding manner. 19. An electroluminescent display device comprising the electroluminescent panel according to claim 1 or 5.

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