CN100358173C - Organic light emitting display component and manufacturing method thereof - Google Patents

Abstract

An organic light emitting display component includes: a first protective layer formed and covered on a metal electrode, the first protective layer being an inert metal layer; a second protective layer formed and covered on the first protective layer, the second protective layer being a metal oxide.

Description

Organic light emitting display component and manufacturing method thereof

technical field

The present invention relates to a display device, and in particular to an organic light-emitting display component and a manufacturing method thereof.

Background technique

In recent years, organic light-emitting display (OLED) has gradually attracted attention in the display market due to its simple structure, excellent operating temperature and response speed, sharp color contrast, and no viewing angle limitation.

OLED uses organic light-emitting components composed of organic materials to produce light sources, but organic materials and metal electrodes are extremely prone to chemical reactions with water. Once exposed to moisture, it will cause the metal electrode to oxidize and peel off from the interface with the organic material, resulting in dark spots on the display. Over time, dark spots will expand in size and number. As a result, not only the brightness of the display is reduced, but also the display quality is significantly reduced, and even the life of the display is shortened.

At present, there are two solutions to this problem: setting a sealing cover and adding a desiccant. However, using a sealed cover to block water vapor requires the addition of many components, and greatly increases the thickness and weight of the device; adding a strong desiccant to enhance water absorption can only temporarily slow down the reaction speed between water vapor and the metal electrode. Once the desiccant is close to saturation, That is, it loses its effect. In addition, these methods require carefully designed equipment and a low-humidity environment to perform the steps of filling the desiccant and packaging. Due to its complicated production process, the required equipment and steps are greatly increased, and the manufacturing cost is also increased.

Therefore, how to fundamentally improve the stability and lifespan of organic light emitting display components while taking into account product advantages and production costs is an important issue at present.

Contents of the invention

In view of this, the purpose of the present invention is to provide an organic light-emitting display component and its manufacturing method, which adopts a simple manufacturing process, uses a light and thin component to improve the ability of metal electrodes to resist moisture and prevent oxidation, reduce dark spots, and increase luminescence. Component stability improves device life.

According to the purpose of the present invention, an organic light-emitting display component is proposed, which is characterized in that it includes: a substrate with a transparent electrode formed on the substrate; an organic light-emitting structure layer formed on the transparent electrode; a metal electrode formed on the organic light-emitting structure layer; and a first protective layer formed and covered on the metal electrode, the first protective layer is an inert metal or an inert metal alloy.

According to the purpose of the present invention, a method for manufacturing an organic light-emitting display component is proposed, which is characterized in that it includes the following steps: providing a substrate with a transparent electrode; forming an organic light-emitting structure layer on the transparent electrode; forming a metal electrode on the organic On the light-emitting structure layer; a first protective layer is formed to cover the metal electrode, and the first protective layer is an inert metal or an inert metal alloy.

In order to further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic structural diagram of an organic light emitting display component according to a preferred embodiment of the present invention.

Detailed ways

Please refer to FIG. 1 , which is a schematic structural diagram of an organic light emitting display component according to a preferred embodiment of the present invention. The organic light emitting display component 100 includes a substrate 101 , a transparent electrode 103 , an organic light emitting structure layer 104 , a metal electrode 105 and a protection structure 110 . The protection structure 110 includes a first protection layer 111 and a second protection layer 112 for protecting metal electrodes, isolating moisture and preventing oxidation. The transparent electrode 103 is formed on the substrate. The organic light emitting structure layer 104 is formed on the transparent electrode 103 . The metal electrode 105 is formed on the organic light emitting structure layer 104 . The first protective layer 111 is formed and covered on the metal electrode 105. The first protective layer 111 is made of a dense inert metal or an inert metal alloy, such as gold, silver, platinum or an alloy of silver and gold, to isolate the metal The electrode 105 is in contact with the water vapor, and the density of the metal electrode 105 is increased to reduce the possibility of chemical reaction between the water vapor and the metal electrode 105 . The second protection layer 112 is formed on the first protection layer 111 , and the second protection layer 112 is made of metal oxide, such as aluminum oxide, nickel oxide, indium tin oxide, silicon oxide or silicon nitride. The second protective layer 112 is used to prevent the metal electrode 105 from being oxidized.

As shown in FIG. 1 , the organic light emitting display component 100 further includes a TFT component 102 formed between the substrate 103 and the transparent electrode 104 , and the organic light emitting display component 100 is an active organic light emitting display component. However, those skilled in the art can understand that the present invention is not limited thereto and can also be applied to passive organic light emitting display components.

In practical applications, the method for manufacturing an organic light emitting display component includes: sequentially forming various layers on a substrate 101; providing a substrate 101 with a transparent electrode 103; forming a TFT component 102 between the substrate 101 and the transparent electrode 103; Forming an organic light-emitting structure layer 104 on the transparent electrode 103; forming a metal electrode 105 on the organic light-emitting structure layer 104; forming a first protective layer 111 to cover the metal electrode 105, the first protective layer 111 is an inert metal or an inert metal alloy layer; forming a second protection layer 112 on the first protection layer 111 , the second protection layer 112 is metal oxide. In addition, in practical applications, a protection layer (not shown) may also be formed on the second protection layer to protect the inside of the organic light emitting display component from abrasion and external force damage. The protection layer is, for example, a hard coating mainly made of polymer materials, or another substrate.

According to the structure described in the embodiment, the organic light-emitting display component of the present invention can also be regarded as a multi-layer metal structure as the electrode of the OLED. The electrode mainly includes three layers, which are respectively according to the order of formation: the first metal electrode (i.e. metal electrode 105), a second metal electrode layer (i.e. first protection layer 111), and a third metal electrode layer (i.e. second protection layer 112). Wherein, the first metal electrode layer is, for example, an aluminum layer; the second metal electrode layer is made of an inert metal or an inert metal alloy, such as gold, silver, platinum or an alloy of silver and gold; the third metal electrode layer is A metal oxide is used as a material, such as aluminum oxide, nickel oxide, indium tin oxide, silicon oxide, or silicon nitride.

Furthermore, since the first protective layer 111 and the second protective layer 112 can protect the organic light-emitting structure layer 104 and the metal electrode 105 from contact with moisture, the organic light-emitting display component 100 is stable both in terms of structure and process. It can be more simplified, with fewer setting components and lower costs. In terms of structure, there is no need to add additional moisture-proof components, such as sealing caps or desiccants. Compared with the traditional process, the protected metal electrodes are not afraid of the reaction of water vapor or other active substances, so the metal oxide layer can prolong the Q-time of OLED components after evaporation. Moreover, in the manufacturing process, there is no need to construct precision equipment and create a low-humidity environment for desiccant filling and packaging steps, simplifying the process and equipment required for production, saving production costs and increasing yield.

The organic light emitting display components disclosed in the above embodiments of the present invention fundamentally enhance the working function, moisture resistance and oxidation resistance of the metal electrodes by utilizing thin and light components and simplified manufacturing processes. First of all, plating a dense first protective layer on the surface of the metal electrode can help electron conduction, reduce the impedance value of the metal electrode, strengthen the work function of the metal electrode, reduce the voltage drop problem of the panel, and improve the display effect and uniformity. In addition, denser metal electrodes are less likely to react chemically with water vapor and form dark spots. In addition, the second protective metal oxide layer can not only prevent water vapor from reacting with the metal electrodes, but also prevent the oxidation of the metal electrodes and prolong the service life. In the actual manufacturing process, the stability and service life of organic light-emitting display components can be effectively improved only by using thin and light components, simplified equipment and processes, and low production costs.

Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and other modifications can be made without departing from the spirit of the present invention. Various equivalent changes or substitutions, therefore, as long as the changes and modifications to the above embodiments are within the spirit of the present invention, they will all fall within the scope of the claims of the present application.

Claims (10)

1. An organic light-emitting display component, characterized in that it comprises: A substrate with a transparent electrode formed on the substrate; an organic light-emitting structure layer formed on the transparent electrode; a metal electrode formed on the organic light emitting structure layer; and A first protection layer is formed and covered on the metal electrode, and the first protection layer is an inert metal or an inert metal alloy. 2 . The organic light emitting display module as claimed in claim 1 , wherein the inert metal material of the first protective layer is gold, silver, platinum or an alloy of silver and gold. 3. The organic light emitting display device as claimed in claim 1, further comprising a second protection layer formed on the first protection layer, the second protection layer being a metal oxide. 4. The organic light emitting display device according to claim 1, further comprising a second protective layer formed on the first protective layer, the material of the second protective layer is aluminum oxide, nickel oxide, indium One of tin oxide, silicon oxide or silicon nitride. 5. The organic light emitting display unit as claimed in claim 3, further comprising a protective layer formed on the second protective layer to protect the organic light emitting display unit from abrasion and impact. 6 . The organic light emitting display module as claimed in claim 5 , wherein the protection layer is a hard film mainly composed of polymer materials. 7 . 7. A method for manufacturing an organic light-emitting display component, comprising the following steps: a. providing a substrate with a transparent electrode; b. forming an organic light-emitting structure layer on the transparent electrode; c. forming a metal electrode on the organic light emitting structure layer; and d. forming a first protective layer to cover the metal electrode, wherein the first protective layer is an inert metal or an inert metal alloy. 8. The manufacturing method according to claim 7, wherein the inert metal material of the first protective layer is gold, silver, platinum or an alloy of silver and gold. 9. The manufacturing method according to claim 7, further comprising the step of: forming a second protection layer on the first protection layer, the second protection layer is composed of a metal oxide. 10. The manufacturing method according to claim 7, characterized in that: a second protective layer is formed on the first protective layer, the material of the second protective layer is aluminum oxide, nickel oxide, indium tin oxide, oxide One of silicon or silicon nitride.

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