CN107644894B - Organic electroluminescent device, preparation method thereof and display device - Google Patents

Abstract

The invention relates to the field of display technology and discloses an organic electroluminescent device, a preparation method thereof and a display device. The organic electroluminescent device includes a first substrate and a second substrate arranged oppositely. The first substrate includes a A first electrode on one side of the two substrates, and the second substrate includes an auxiliary electrode layer facing the first substrate side; a conductive spacer is provided between the first substrate and the second substrate, and the auxiliary electrode layer passes through The spacer is electrically connected to the first electrode. In the above-mentioned organic electroluminescent device, a conductive spacer is provided between the first substrate and the second substrate, thereby realizing the electrical connection between the first substrate and the second substrate and reducing the impact of damage to the spacer on the first substrate. The probability of electrical connection with the second substrate increases the service life of the organic electroluminescent device.

Description

An organic electroluminescent device, its preparation method and display device

Technical field

The present invention relates to the field of display technology, and in particular to an organic electroluminescent device, its preparation method and a display device.

Background technique

Organic electroluminescent displays have the characteristics of thinness, low consumption, high response, and high resolution. Top-emission passive organic electroluminescent displays can effectively solve the reduction in aperture ratio and display brightness caused by complex thin film field effect tube compensation circuits. At the same time, by utilizing the microcavity effect existing in the structure of top-emission passive organic electroluminescence display devices, the color gamut of the display screen of passive organic electroluminescence display can also be improved and the display effect can be improved.

As a necessary projection part of the top-emitting passive organic electroluminescence display, the light transmittance and conductivity of the transparent cathode are crucial. At present, the auxiliary electrode layer is usually connected to the cathode by making it on the spacer, but the auxiliary electrode layer is The way the layer is formed on the spacer can easily cause the auxiliary electrode layer to break, which affects the display effect of the display device and shortens the service life of the display device.

Contents of the invention

The invention provides an organic electroluminescent device, a preparation method thereof and a display device. In the organic electroluminescent device, a conductive spacer is provided between a first substrate and a second substrate, thereby realizing the first substrate The electrical connection with the second substrate reduces the probability that the spacer is damaged and affects the electrical connection between the first substrate and the second substrate, and improves the service life of the organic electroluminescent device.

In order to achieve the above objects, the present invention provides the following technical solutions:

An organic electroluminescent device includes a first substrate and a second substrate arranged oppositely. The first substrate includes a first electrode facing the side of the second substrate, and the second substrate includes a first electrode facing the first side. An auxiliary electrode layer on one side of the substrate; a conductive spacer is provided between the first substrate and the second substrate, and the auxiliary electrode layer is electrically connected to the first electrode through the spacer.

In the above-mentioned organic electroluminescent device, the first substrate includes a first electrode facing the second substrate side, the second substrate includes an auxiliary electrode layer facing the first substrate side, and a conductive layer is provided between the first substrate and the second substrate. The spacer with high performance electrically connects the first electrode and the auxiliary electrode layer, realizing the electrical connection between the first substrate and the second substrate, replacing the existing technology of making the auxiliary electrode layer on the surface of the spacer to realize the third The connection method of electrically connecting the second substrate and the first substrate avoids the breakage of the auxiliary electrode layer during the use of the organic electroluminescent device, and reduces the probability of spacer damage affecting the electrical connection between the first substrate and the second substrate. , improving the service life of organic electroluminescent devices;

Therefore, a conductive spacer is provided between the first substrate and the second substrate, thereby realizing the electrical connection between the first substrate and the second substrate, and reducing the impact of damage to the spacer on the electrical connection between the first substrate and the second substrate. probability, improving the service life of organic electroluminescent devices.

Preferably, the spacer includes a spacer body, a hollow cavity is formed in the spacer body, and the hollow cavity is filled with conductive material to form a spacer for electrically connecting the first electrode and the auxiliary electrode. layer of conductive pillars.

Preferably, in the second substrate, a metal layer corresponding to the conductive pillar is provided on a side of the auxiliary electrode layer facing the first substrate, and the auxiliary electrode layer is connected to the conductive pillar through the metal layer. Column electrical connection.

Preferably, the conductive pillar material is silver nanowires or conductive gold balls.

Preferably, a plurality of spacers are provided between the first substrate and the second substrate, and the hollow cavity is formed in the body of each spacer, and each spacer The conductive pillar is disposed in the hollow cavity of the object body.

Preferably, the first substrate includes a thin film transistor device layer, a pixel definition layer, and an organic electronic layer formed in a pixel area defined by the pixel definition layer and located on a side of the first substrate facing the second substrate. Luminescent layer.

Preferably, the second substrate includes a black matrix layer, a color filter layer and a flat layer, and the black matrix layer is positioned corresponding to the spacer.

Preferably, the first electrode and the auxiliary electrode layer are ITO.

The present invention also provides a display device, including any organic electroluminescent device described in the above technical solutions.

The invention also provides a method for preparing an organic electroluminescent device, which includes:

forming a first electrode on one side of the first substrate;

Form an auxiliary electrode on one side of the second substrate;

Form a conductive spacer on the side of the auxiliary electrode away from the second substrate;

The first substrate and the second substrate are assembled so that the side of the first substrate provided with the first electrode and the side of the second substrate provided with the auxiliary electrode face each other, and the The auxiliary electrode is electrically connected to the first electrode through the spacer.

Preferably, the step of forming a conductive spacer on the side of the auxiliary electrode away from the second substrate includes:

Form a spacer material layer on the side of the auxiliary electrode away from the second substrate;

Perform a patterning process on the spacer material layer to form the spacer, and simultaneously form a cavity penetrating the spacer inside the spacer;

Conductive material is filled into the cavity to form conductive pillars, and the auxiliary electrode is electrically connected to the first electrode through the conductive pillars.

Preferably, after the auxiliary electrode layer is formed on one side of the second substrate and before the spacer material is formed on the side of the auxiliary electrode layer away from the second substrate, the method further includes:

A metal coating is formed on the auxiliary electrode layer, and a metal layer pattern corresponding to the position of the conductive pillar is formed through a patterning process. The auxiliary electrode is electrically connected to the conductive pillar through the metal layer pattern.

Description of drawings

Figure 1 is a schematic structural diagram of an organic light-emitting device provided by the present invention.

Icon: 1-second substrate; 11-auxiliary electrode layer; 12-metal layer; 13-black matrix layer; 14-color filter layer; 15-flat layer; 2-first substrate; 21-first electrode; 22 -Thin film transistor device layer; 23-pixel definition layer; 24-organic electroluminescent layer; 3-spacer; 31-spacer body; 32-conductive pillar.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Please refer to Figure 1. An organic electroluminescent device provided by an embodiment of the present invention includes a first substrate 2 and a second substrate 1 that are oppositely arranged. The first substrate 2 includes a first electrode 21 facing the second substrate 1. The second substrate 1 includes an auxiliary electrode layer 11 facing the first substrate 2; a conductive spacer 3 is disposed between the first substrate 2 and the second substrate 1, and the auxiliary electrode layer 11 is connected to the second substrate through the spacer 3. An electrode 21 is electrically connected.

In the above-mentioned organic electroluminescent device, the first substrate 2 includes a first electrode 21 facing the second substrate 1 side, and the second substrate 1 includes an auxiliary electrode layer 11 facing the first substrate 2 side. A conductive spacer 3 is provided between the two substrates 1 to electrically connect the first electrode 21 and the auxiliary electrode layer 11, thereby realizing the electrical connection between the first substrate 2 and the second substrate 1, replacing the conventional method of The auxiliary electrode layer 11 is formed on the surface of the spacer 3 to realize the electrical connection between the second substrate 1 and the first substrate 2, thereby avoiding the breakage of the auxiliary electrode layer 11 during the use of the organic electroluminescent device. The probability of damage to the spacer 3 affecting the electrical connection between the first substrate 2 and the second substrate 1 is reduced, and the service life of the organic electroluminescent device is improved;

Therefore, a conductive spacer 3 is provided between the first substrate 2 and the second substrate 1, thereby realizing the electrical connection between the first substrate 2 and the second substrate 1, and reducing the damage of the spacer 3 to the first substrate. 2 is electrically connected to the second substrate 1, thereby improving the service life of the organic electroluminescent device.

Specifically, the spacer 3 with conductive properties is made of conductive material, or conductive particles are arranged in the spacer 3 .

Specifically, the spacer 3 includes a spacer body 31, a hollow cavity is formed in the spacer body 31, and the hollow cavity is filled with conductive material to form a conductive layer for electrically connecting the first electrode 21 and the auxiliary electrode layer 11. Column 32.

In the spacer 3 described above, the first electrode 21 is electrically connected to the auxiliary electrode layer 11 by providing a hollow cavity in the spacer body 31 and filling the hollow cavity with conductive material to form a conductive pillar 32. The electrical connection between the substrate 2 and the second substrate 1, the spacer body 31 outside the conductive pillar 32 can reduce the pressure on the conductive pillar 32, thereby reducing the pressure of the spacer 3 during the use of the organic electroluminescent device. The probability of damage increases the service life of organic electroluminescent devices.

Specifically, the conductive pillar 32 is made of silver nanowires or conductive gold balls.

The nano-silver wires or conductive gold balls used in the conductive pillars 32 have excellent electrical conductivity. The use of nano-silver wires or conductive gold balls as the material of the conductive pillars 32 reduces energy loss during the conductive process.

As an embodiment of the above-mentioned second substrate 1 , in the second substrate 1 , a metal layer 12 corresponding to the conductive pillar 32 is provided on the side of the auxiliary electrode layer 11 facing the first substrate 2 , and the auxiliary electrode layer 11 passes through the metal layer 12 It is electrically connected to the conductive pillar 32 .

In the above-mentioned second substrate 1, by disposing the metal layer 12 between the auxiliary electrode layer 11 and the conductive pillar 32, the contact area between the metal layer 12 and the conductive pillar 32 is increased, ensuring the electrical connection between the conductive pillar 32 and the auxiliary electrode layer 11. Stability improves the stability of the electrical connection between the second substrate 1 and the first substrate 2 .

As an embodiment of the above-mentioned spacer 3, a plurality of spacers 3 are provided between the first substrate 2 and the second substrate 1, and a hollow cavity is formed in each spacer body 31, and each spacer is Conductive pillars 32 are provided in the hollow cavity of the cushion body 31 .

In the above-mentioned spacers 3, conductive pillars 32 are provided in each spacer 3, which improves the conductive efficiency between the first substrate 2 and the second substrate 1, and when one or several of the plurality of conductive pillars 32 conduct electricity, When the pillars 32 are damaged, the remaining conductive pillars 32 can continue to conduct electricity, ensuring the normal use of the organic electroluminescent device.

As an embodiment of the above-mentioned first substrate 2 , the first substrate 2 includes a thin film transistor device layer 22 and a pixel definition layer 23 . The organic electroluminescent layer 24 on one side of the second substrate 1 .

As an embodiment of the above-mentioned second substrate 1 , the second substrate 1 includes a black matrix layer 13 , a color filter layer 14 and a flat layer 15 . The position of the black matrix layer 13 corresponds to the spacer.

In the above-mentioned second substrate 1, the position of the black matrix layer 13 is arranged corresponding to the spacer, so as to avoid reducing the aperture ratio and improve the brightness of the display device.

Specifically, the first electrode 21 and the auxiliary electrode layer 11 are ITO.

An embodiment of the present invention also provides a display device, including any one of the organic electroluminescent devices in the above embodiments.

Embodiments of the present invention also provide a method for preparing an organic electroluminescent device, including:

A first electrode 21 is formed on one side of the first substrate 2;

Form an auxiliary electrode on one side of the second substrate 1;

A conductive spacer is formed on the side of the auxiliary electrode away from the second substrate 1;

The first substrate 2 and the second substrate 1 are paired so that the side of the first substrate 2 provided with the first electrode 21 faces the side of the second substrate 1 provided with the auxiliary electrode, and the auxiliary electrode is connected to the first electrode 21 through spacers. An electrode 21 is electrically connected.

In the above method for preparing an organic electroluminescent device, a first electrode 21 is formed on one side of the first substrate 2, an auxiliary electrode and a spacer 3 are formed on one side of the second substrate 1, and the second substrate 1 and the third substrate are connected. One substrate 2 is connected to the box to form an organic electroluminescent device. The spacer 3 has conductive properties, realizing the electrical connection between the first substrate 2 and the second substrate 1 and reducing the use of the organic electroluminescent device. During the process, damage to the spacer 3 affects the probability of electrical conduction between the first substrate 2 and the second substrate 1, thereby increasing the service life of the organic electroluminescent device.

Specifically, the step of forming a conductive spacer 3 on the side of the auxiliary electrode away from the second substrate 1 includes:

Form a spacer material layer on the side of the auxiliary electrode away from the second substrate 1;

Perform a patterning process on the spacer material layer to form the spacer 3, and at the same time form a cavity penetrating the spacer 3 inside the spacer 3;

Conductive material is filled into the cavity to form conductive pillars 32 , and the auxiliary electrode is electrically connected to the first electrode 21 through the conductive pillars 32 .

In the above-mentioned spacer 3, a cavity is formed in the spacer body 31, and a conductive material is filled in the cavity to form a conductive pillar 32. The spacer body 31 outside the conductive pillar 32 can reduce the pressure on the conductive pillar 32. , thereby reducing the probability of the spacer 3 being damaged during the use of the organic electroluminescent device, and improving the service life of the organic electroluminescent device.

Specifically, after the auxiliary electrode layer 11 is formed on one side of the second substrate 1 and before the spacer material is formed on the side of the auxiliary electrode layer 11 away from the second substrate 1, it also includes:

A metal coating is formed on the auxiliary electrode layer 11, and a metal layer pattern corresponding to the conductive pillars 32 in the spacer 3 is formed through a patterning process. The auxiliary electrode communicates with the conductive pillars through the metal layer pattern. 32 electrical connections.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims (10)

1. An organic electroluminescent device, characterized in that it includes a first substrate and a second substrate arranged oppositely, the first substrate includes a first electrode facing the side of the second substrate, and the second substrate It includes an auxiliary electrode layer facing the side of the first substrate; a conductive spacer is provided between the first substrate and the second substrate, and the auxiliary electrode layer communicates with the first electrode through the spacer. electrical connection; Wherein, the spacer includes a spacer body, a hollow cavity is formed in the spacer body, and the hollow cavity is filled with conductive material to form a layer for electrically connecting the first electrode and the auxiliary electrode. conductive pillars. 2. The organic electroluminescent device according to claim 1, wherein in the second substrate, a metal corresponding to the conductive pillar is provided on a side of the auxiliary electrode layer facing the first substrate. layer, the auxiliary electrode layer is electrically connected to the conductive pillar through the metal layer. 3. The organic electroluminescent device according to claim 1, wherein the conductive pillar material is silver nanowires or conductive gold balls. 4. The organic electroluminescent device according to claim 1, wherein a plurality of spacers are provided between the first substrate and the second substrate, and each spacer body The hollow cavities are formed in each spacer body, and the conductive pillars are disposed in the hollow cavities of each spacer body. 5. The organic electroluminescent device according to claim 1, wherein the first substrate includes a thin film transistor device layer, a pixel definition layer, and is formed in a pixel area defined by the pixel definition layer and located The organic electroluminescent layer on one side of the first substrate faces the second substrate. 6. The organic electroluminescent device according to claim 1, wherein the second substrate includes a black matrix layer, a color filter layer and a flat layer, and the position of the black matrix layer is in relation to the spacer. object corresponding settings. 7. The organic electroluminescent device according to any one of claims 1 to 6, wherein the first electrode and the auxiliary electrode layer are ITO. 8. A display device, characterized by comprising the organic electroluminescent device according to any one of claims 1-7. 9. A method for preparing an organic electroluminescent device, characterized by comprising: forming a first electrode on one side of the first substrate; forming an auxiliary electrode on one side of the second substrate; Form a conductive spacer on the side of the auxiliary electrode away from the second substrate; The first substrate and the second substrate are assembled so that the side of the first substrate provided with the first electrode and the side of the second substrate provided with the auxiliary electrode face each other, and the The auxiliary electrode is electrically connected to the first electrode through the spacer; Wherein, the step of forming a conductive spacer on a side of the auxiliary electrode away from the second substrate includes: Form a spacer material layer on the side of the auxiliary electrode away from the second substrate; Perform a patterning process on the spacer material layer to form the spacer, and simultaneously form a cavity penetrating the spacer inside the spacer; Conductive material is filled into the cavity to form conductive pillars, and the auxiliary electrode is electrically connected to the first electrode through the conductive pillars. 10. The preparation method according to claim 9, characterized in that after forming an auxiliary electrode layer on one side of the second substrate, a spacer material is formed on a side of the auxiliary electrode layer away from the second substrate. Previously, this also included: A metal coating is formed on the auxiliary electrode layer, and a metal layer pattern corresponding to the position of the conductive pillar is formed through a patterning process. The auxiliary electrode is electrically connected to the conductive pillar through the metal layer pattern.