TW200428689A - Organic electro-luminescent device array and fabrication method thereof - Google Patents

Abstract

An organic electro-luminescent device array and the fabrication method thereof are described. The organic electro-luminescent device array comprised a base plate, a lower electrode layer, a dielectric layer a organic functional layer, an electrode separator layer and an upper electrode layer. The dielectric layer has a plurality of notches and at least one of injecting groove. The injecting grooves connect to part of notches respectively. Owing to the design of injecting groove, the liquid state organic functional material flow into the notches that connect to the injecting grooves when forming the organic functional layer. Therefore, the request of precisely positioning of mask can be reduced. Furthermore, the widths increasing of separator layer for avoiding positioning inaccuracy can be reduced, and the aperture ratio and lighting efficiency of the organic electro-luminescent device array can be raised.

Description

200428689 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to an organic electro-excitation light element array and a manufacturing method thereof, and particularly to an organic electro-excitation having a high aperture ratio and luminous efficiency. Light display. [Previous technology] Flat displays are communication interfaces between people and information. At present, flat displays mainly include the following: Organic Electro-Luminescent Display (0ELD), Plasma Display Panel (PDP), LCD Display (Liquid Crystal Display, LCD), Light Emitting Diode (LED), Vacuum Fluorescent Display, Field Emission Display (FED), and Electro-chromic Display) and so on. Among them, the organic electroluminescent display has great application potential due to its self-emission, no viewing angle dependence, power saving, simple process, low cost, low operating temperature range, high response speed, and full color, etc., and is expected to become the next The mainstream of the first generation of flat panel displays. An organic electroluminescent display is a display element that utilizes the self-luminous properties of an organic light-emitting material to achieve a display effect. The light emitting structure is mainly composed of a pair of electrodes and an organic functional material layer. When the current passes between the anode and the cathode, the electrons and holes are combined in the organic functional material layer to generate excitons, so that the organic functional material layer can produce different colors of light according to the characteristics of its material. Mechanism, which is the light-emitting principle of the organic electro-excitation light element. Organic electro-excitation photons for high-efficiency light-emitting characteristics

11204twf.ptd Page 6 200428689 V. Description of the invention (2) The most common method is to form a light-emitting layer by vacuum evaporation of a small molecule organic electro-excitation light material. Figures 1A to 1C are schematic cross-sectional views showing the process of selecting and forming an organic light-emitting layer for a conventional organic electroluminescent device. Please refer to FIG. 1A to FIG. 1C together. First, an anode 110, a patterned insulating layer 120, and a cathode separator layer 1 3 0 are formed on a substrate 100, and a mask 1 is formed. The opening 1 40 of 40 is aligned with a region where the organic light emitting layer is to be formed to form a red organic light emitting layer R 1 0. Next, the opening 1 4 5 of the mask 140 is aligned with the next area where the organic light emitting layer is to be formed to form a green organic light emitting layer G10. Finally, the opening 145 of the moving mask 140 is aligned with the area where the organic light emitting layer is finally scheduled to be formed to form a blue organic light emitting layer B 1 0. In this conventional method, the mask 1 40 needs a high-precision automatic alignment mechanism, and in order to compensate for the alignment error, a method of increasing the width of the cathode isolation layer 1 3 0 is often used to cause the organic electroluminescent display. The aperture ratio is significantly reduced. FIG. 2 is a schematic diagram of another conventional organic electro-optic light emitting element. Please refer to FIG. 2, the organic electroluminescent device 200 is composed of a substrate 210, electrode layers 220a-220d, a red organic light emitting layer R20, a green organic light emitting layer G20, and a blue organic light emitting layer B20. Interactive stack composition. In this conventional organic electroluminescent device, it is very difficult to wire the four electrode layers 2 2 a-2 2 0 d to the control circuit separately, and because red light and green light need to pass through many films The layer can penetrate the substrate, and the light loss is very serious. In addition, the optical thickness of each film layer needs to be properly calculated and controlled, which makes it difficult to manufacture and the quality is not satisfactory.

11204twf.ptd Page 7 200428689 V. Description of the Invention (3) Figure 3 shows a schematic diagram of another conventional organic electro-optical light emitting element. Please refer to FIG. 3, the organic electroluminescent device 3 0 0 is composed of a substrate 3 1 0, a blue organic light-emitting layer B 3 0, a blue-green conversion layer 3 2 0, and a green-red conversion layer. 3 3 0. The green light is formed by the blue light emitted by the blue organic light-emitting layer B 3 0 through the action of the blue-green conversion layer 3 2 0, and the red light is formed by the action of the green-red conversion layer 3 3 0. In the conventional organic electroluminescent device, since red light and green light are converted by color conversion, there is still a disadvantage that the light emission efficiency is low. [Summary of the Invention] Therefore, an object of the present invention is to provide an organic electroluminescent device array and a manufacturing method thereof, which are suitable for increasing the aperture ratio and luminous efficiency of an organic electroluminescent display. Based on the above objectives, the present invention provides an organic electroluminescent device array. The organic electroluminescent device array is mainly composed of a substrate, a first patterned electrode layer, a dielectric layer, an organic light emitting device layer, and a second Consists of a patterned electrode layer. The first patterned electrode layer is disposed on the substrate. The dielectric layer is disposed on the substrate and covers the first patterned electrode layer. The dielectric layer has a plurality of openings and at least one implanted trench corresponding to the edge of the substrate, and these openings expose the first patterned electrode layer. And these implanted trenches are respectively communicated with part of the openings. The organic light emitting element layer is disposed on the first patterned electrode layer exposed by the opening. The second patterned electrode layer is disposed on the organic light-emitting element layer. In addition, the first patterned electrode layer includes a plurality of first strip electrodes, the second patterned electrode layer includes a plurality of second strip electrodes, and the first strip electrode

11204twf.ptd Page 8 200428689 V. Description of the invention (4) The extending direction is perpendicular to the extending direction of the second strip electrode. The organic electroluminescent-light emitting element array further includes an electrode separation layer disposed on the dielectric layer between the openings, and the electrode separation layer is parallel to the extending direction of the second strip-shaped electrode. Based on the above objective, the present invention further provides a method for manufacturing an organic electroluminescent device array. The method for manufacturing the organic electroluminescent device array firstly provides a substrate. Next, a first patterned electrode layer is formed on the substrate. Subsequently, a dielectric layer having a plurality of openings, a first implantation trench and a second implantation trench is formed on the substrate to cover the first patterned electrode layer. The opening exposes the first patterned electrode layer, and the first implantation trench and the second implantation trench are respectively communicated with a part of the opening. After that, a first liquid organic functional material is injected into the first injection trench, so that the first liquid organic functional material flows to a part of the opening communicating with the first injection trench to form a first organic light emitting element layer. Subsequently, in the remaining openings where the first organic light emitting element layer is not formed, for example, a second organic light emitting element layer and a third organic light emitting element layer are formed by evaporation. Finally, a second patterned electrode layer is formed on the first organic light emitting element layer, the second organic light emitting element layer and the third organic light emitting element layer. In addition, an electrode separation layer is formed on the dielectric layer formed between the dielectric layer, the first organic light emitting element layer, the second organic light emitting element layer, and the third organic light emitting element layer, and the dielectric layer between the openings. In addition, the second organic light-emitting element layer can also be formed by injecting a second liquid organic functional material in an opening that is in communication with the second injection trench. It is worth noting that in the present invention, since

11204twf.ptd Page 9 200428689 V. Description of the invention (5) It is planned that the liquid organic functional material can automatically flow to the light-emitting area communicating with the injection groove due to the action of the capillary phenomenon '. Therefore, compared with the conventional manufacturing method of the organic electroluminescent device array, the present invention can greatly reduce the precise alignment requirements of the mask, and can also reduce the width of the electrode separation layer which is increased to avoid the alignment error, thereby improving the The aperture ratio and luminous efficiency of the organic electro-excitation light element array are proposed. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to describe in detail as follows: [Embodiment Mode] FIG. 4 A schematic diagram of an organic electroluminescent device array according to a first preferred embodiment of the present invention is shown. Please refer to FIG. 4, the organic electroluminescent element array 400 is mainly composed of a substrate 4 10, a first patterned electrode layer 420, a dielectric layer 430, an electrode separation layer 440, and an organic light emitting device. The element layer 450 and a second patterned electrode layer 460 are formed. The first patterned electrode layer 420 is disposed on the substrate 410. The dielectric layer 4 3 0 is disposed on the substrate 4 1 0 and covers the first patterned electrode layer 4 2 0. The dielectric layer 4 3 0 has a plurality of openings 4 3 2 and is located at an edge corresponding to the substrate 4 1 0 One of the trenches 434 is implanted, and the openings 432 expose the first patterned electrode layer 4 2 0, and the implanted trenches 4 3 4 are in communication with part of the openings 4 3 2. The electrode separation layer 4 4 0 is disposed on the dielectric layer 4 3 0 between the openings 4 3 2. The organic light emitting element layer 4 50 is disposed on the first patterned electrode layer 4 2 0 exposed by the opening 4 3 2. The second patterned electrode layer 4 6 0 is disposed on the organic light emitting element layer 4 5 0.

11204twf.ptd Page 10 200428689 V. Description of the invention (6) In addition, the first patterned electrode layer 4 2 0 is composed of a plurality of first stripe electrodes, for example. Due to the function of the electrode separation layer 440, the electrode separation layer 440 and the second patterned electrode layer 460 on the organic light emitting element layer 450 naturally form a plurality of second strip electrodes that are not electrically connected to each other, and the first The extending direction of the strip electrode is, for example, perpendicular to the extending direction of the second strip electrode. The material of the substrate 4 1 0 is, for example, glass or plastic, and the material of the first patterned electrode layer 4 2 0 and the second patterned electrode layer 4 60 is, for example, indium tin oxide (IT 0), indium zinc oxide ( IZO) or metal. FIG. 5 is a schematic diagram of an organic electro-optical light emitting element array according to a second preferred embodiment of the present invention. Please refer to FIG. 5. According to the second preferred embodiment of the present invention, an organic electroluminescent device 0 array is mainly added with an injection trench, and the rest is the same as the first preferred embodiment. This will not repeat them here. The organic electroluminescent element array 500 is mainly composed of a substrate 510, a first patterned electrode layer 520, a dielectric layer 530, an electrode separation layer 540, an organic light emitting element layer 550, and a second patterned electrode. Consists of layers 560. The dielectric layer 530 has a plurality of openings 5 3 2 and one of the first implantation trenches 5 3 4 and a second implantation trench 5 3 6 located at an edge corresponding to the substrate 5 10. The grooves 5 3 4 and the second injection grooves 5 3 6 are respectively communicated with the partial openings 5 3 2. 6A to 6E are cross-sectional views taken along the flow path of I-Γ in a method for manufacturing an organic electro-optical light emitting element array according to a first preferred embodiment of the present invention. First, referring to FIG. 4 and FIG. 6A together, the base is provided with a substrate 410 and a first patterned electrode layer 4 2 0 is formed on the substrate 410, and then a plurality of openings 4 are formed on the substrate 4 1 0 3 2 and an implanted trench 4 3 4

11204twf.ptd Page 11 200428689 V. Description of Invention (7) One of the dielectric layers 430 covers the first patterned electrode layer 420. The opening 432 exposes the first patterned electrode layer 420, and the injection trench 434 is in communication with a part of the opening 4 3 2. Then, an electrode separation layer 440 is formed on the dielectric layer 4 3 0 between the openings 4 3 2. The electrode separation layer 440 has a structure having a reverse slope (T a p e r) shape. Next, please refer to FIG. 4 and FIG. 6B together, and inject a liquid organic functional material into the injection groove 4 3 4 by dripping or ink jetting, so that the liquid organic functional material can be caused by capillary action. Automatically flows to a portion of the opening 4 3 2 communicating with the injection trench 4 3 4 to form a first organic light emitting element layer 4 5 2. Subsequently, please refer to FIG. 6C and FIG. 6D together, and use evaporation to form a first mask 470 by patterning one of the remaining openings 432 in which the first organic light emitting element layer 452 is not formed to form a first Two organic light-emitting element layers 454 and a third organic light-emitting element layer 456. Finally, referring to FIG. 6E, a second patterned electrode layer 4 60 is formed on the first organic light emitting element layer 4 52, the second organic light emitting element layer 454, and the third organic light emitting element layer 456. 7A to 7E are cross-sectional views of a method for manufacturing an organic electro-optic light emitting element array according to a second preferred embodiment of the present invention, which is taken along the flow of Π-Π '. In the method for manufacturing an organic electroluminescent device array according to the second preferred embodiment of the present invention, the method of forming the organic light-emitting element layer is mainly changed, and the rest are the same as the manufacturing method of the first preferred embodiment. That is not repeated. First, please refer to FIG. 5 and FIG. 7A together to form a dielectric layer having a plurality of openings 5 3 2 on a substrate 5 1 2, a first implant trench 534 and a second implant trench 536. 530 to cover the first patterned electrode layer 520. The opening 532 exposes the first patterned electrode.

11204twf.ptd Page 12 200428689 V. Description of the invention (8) The layer 5 2 0, and the first injection trench 5 3 4 and the second injection trench 5 3 6 are respectively communicated with the partial opening 5 3 2. Next, please refer to FIG. 5, FIG. 7B and FIG. 7C together, and inject a first liquid organic functional material and a second liquid organic functional material into the first injection groove 5 3 4 and the second injection groove, respectively. Slot 5 3 6. The first liquid organic functional material is automatically flowed to a part of the opening 5 3 2 communicating with the first injection trench 5 3 4 to form a first organic light emitting element layer 5 5 2. The second liquid organic functional material automatically flows to the portion opening 5 3 2 communicating with the second injection trench 5 3 6 to form a second organic light emitting element layer 5 5 4. Finally, referring to FIG. 7D and FIG. 7E together, a third organic light-emitting element layer 5 5 6 is formed by a patterned mask 570, and then a second patterned electrode layer 5 60 is formed. Although the present invention has been disclosed above in a number of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

11204twf.ptd Page 13 200428689 Brief description of the diagrams Figures 1A to 1C are schematic cross-sectional schematic diagrams of the process of selecting and forming an organic light-emitting layer for a conventional organic electroluminescent device; FIG. 2 is shown as The schematic diagram of another conventional organic electroluminescent device is shown in FIG. 3. The schematic diagram of another conventional organic electroluminescent device is shown in FIG. 4. The schematic diagram of the first preferred embodiment according to the present invention is shown in FIG. 4. Schematic diagram of an electromechanical excitation light element array; FIG. 5 shows a schematic diagram of an organic electroluminescent light element array according to a second preferred embodiment of the present invention; and FIGS. 6A to 6E show as A cross-sectional view of a method for manufacturing an organic electro-optical light emitting element array according to a first preferred embodiment of the present invention along the flow of I-Γ; and FIGS. 7A to 7E are shown as proposed according to the present invention. The manufacturing method of the organic electroluminescent element array of the second preferred embodiment is a cross-sectional view along the flow of Π-Π '. [Illustration of diagrammatic symbols] 110, 2 1 0 \ 3 1 0: substrate 1 1 0: anode 1 2 0: patterned insulating layer 1 3 0: cathode isolation layer 1 40: mask · 145: opening R 1 0, R 2 0: red organic light emitting layer

11204twf.ptd Page 14 200428689 Brief description of the drawings G 1 0, G 2 0: Green organic light-emitting layers BIO, R20, R30: Blue organic light-emitting layer 2 0 0: Organic electro-luminescent element 2 2 0 a > 2 2 0 b, 220c, 220d ·· electrode layer 3 2 0: blue-green conversion layer 3 3 0: green-red conversion layer 4 0 0, 5 0 0 · organic electro-excitation light element array 4 1 0, 5 1 0: substrates 420, 520: first patterned electrode layers 430, 530: dielectric layers 440, 540: electrode separation layers 4 50, 5 5 0: organic light emitting element layers 4 6 0, 5 6 0 ,: second Patterned electrode layer 4 3 2, 5 3 2: Opening 4 3 4: Injection trenches 452, 552: First organic light emitting element layer 454, 554: Second organic light emitting element layer 4 5 6, 5 5 6: Third Organic light emitting element layers 470, 570: mask 5 3 4: first injection trench 5 3 6: second injection trench

11204twf.ptd Page 15

Claims (1)

200428689 VI. Scope of patent application 1. An organic electro-optical light-emitting element array at least includes:-a substrate; a first patterned electrode layer disposed on the substrate; a dielectric layer disposed on the substrate and covering the substrate A first patterned electrode layer, the dielectric layer having a plurality of openings, and an implanted trench, wherein the openings expose the first patterned electrode layer, and the implanted trench is in communication with some of the openings; an organic A light emitting element layer is disposed on the first patterned electrode layer exposed by the openings; and a second patterned electrode layer is disposed on the organic light emitting element layer. 2. The organic electroluminescent device array < 1 row as described in item 1 of the patent application scope, wherein the substrate comprises a glass substrate and a plastic substrate. 3. The organic electro-optic light-emitting element array according to item 1 of the scope of patent application, wherein the first patterned electrode layer includes a plurality of first strip electrodes, and the second patterned electrode layer includes a plurality of second strip electrodes. And the extending directions of the first strip electrodes are perpendicular to the extending direction of the second strip electrodes. 4. The organic electro-optical light-emitting element array according to item 3 of the scope of patent application, further comprising an electrode separation layer disposed on the dielectric layer between the openings, and the electrode separation layer is connected to the The extending directions of the two strip electrodes are parallel. _ 5. The organic electro-optic light-emitting element array according to claim 1, wherein the implantation groove is located in the dielectric layer corresponding to the edge of the substrate. 11204twf.ptd Page 16 200428689 6. Application Patent Scope 6 · The organic electro-optical light emitting element array described in item 1 of the patent application scope, wherein the material of the first patterned electrode layer includes indium tin oxide (ITO), Indium zinc oxide (IZ0), and one of the metals. 7. The organic electro-optical light-emitting element array according to item 1 of the scope of patent application, wherein the material of the second patterned electrode layer includes indium tin oxide (ITO), indium zinc oxide (IZ0), and a metal among them One. 8. An organic electro-optic light-emitting element array, at least comprising: a substrate; a first patterned electrode layer disposed on the substrate; a layer, the two injections and the first port communicating with a dielectric layer, disposed on the substrate The first patterned electrode dielectric layer covering and covering the first patterned electrode has a plurality of openings, a first implanted trench and a first trench, wherein the openings expose the first patterned electrode layer, an implanted trench and the first trench. The two implanted trenches are respectively separated from the organic light emitting element layers and disposed on the first patterned electrode layer exposed by the openings; and a second patterned electrode layer is disposed on the organic light emitting element. On the floor. 9. The organic electroluminescent device array according to item 8 of the scope of patent application, wherein the substrate comprises a glass substrate and a plastic substrate. 10. The organic electro-optic light element array according to item 8 of the scope of the patent application, wherein the first patterned electrode layer includes a plurality of first strip electrodes, and the second patterned t-electrode layer includes a plurality of first strip electrodes. Two strip electrodes, and an extension direction of the first strip electrodes is perpendicular to an extension direction of the second strip electrodes. 11204twf.ptd Page 17 200428689 6. Application scope of patent 1 1. The organic electro-optical light-emitting element array described in item 10 of the scope of patent application, further includes an electrode separation layer, and the dielectric disposed between the openings. On the electrical layer, and the electrode separation layer is parallel to the extending direction of the second strip electrodes. 1 2. The organic electro-optic light-emitting element array according to item 8 of the scope of patent application, wherein the first implanted trench and the second implanted trench are respectively located in the dielectric layer corresponding to the edge of the substrate . 1 3. The organic electro-optic light-emitting element array according to item 8 of the scope of patent application, wherein the material of the first patterned electrode layer includes indium tin oxide (ITO), indium zinc oxide (IZ0), and metal. one. 1 4. The organic electro-optical light-emitting element array according to item 8 of the scope of patent application, wherein the material of the second patterned electrode layer includes indium tin oxide (ITO), indium zinc oxide (IZ0), and metal. one. 15. A method for manufacturing an organic electroluminescent device array, comprising: providing a substrate; forming a first patterned electrode layer on the substrate; forming a dielectric layer on the substrate to cover the first pattern An electrode layer, the dielectric layer having a plurality of openings and an injection trench, wherein the openings expose the first patterned electrode layer, and the injection trench is in communication with some of the openings; injecting a liquid organic function Material in the injection trench to flow the liquid organic functional material to the openings in a portion communicating with the injection trench to form a first organic light emitting element layer; In the remaining openings, 11204twf.ptd Page 18 200428689 6. Form a patent application to form a second organic light emitting element layer and a third organic light emitting element layer; and on the first organic light emitting element layer, the second organic light emitting element layer and the third organic light emitting element layer A second patterned electrode layer is formed on the organic light emitting element layer. 16. The method for manufacturing an organic electroluminescent device array according to item 15 of the scope of patent application, wherein the dielectric layer is formed and the first organic light emitting element layer, the second organic light emitting element layer and the first organic light emitting element layer are formed. An electrode separation layer is formed between the three organic light emitting element layers and on the dielectric layer between the openings. [17] The method for manufacturing an organic electroluminescent device array according to item 15 of the scope of patent application, wherein the method of injecting the liquid organic functional material includes dripping and ink jetting. 18. The method for manufacturing an organic electroluminescent device array according to item 15 of the scope of patent application, wherein the method of forming the second organic light emitting element layer and the third organic light emitting element layer includes evaporation. 19. A method for manufacturing an organic electro-optical light emitting element array, comprising: providing a substrate; forming a first patterned electrode layer on the substrate; forming a dielectric layer on the substrate to cover the first patterning An electrode layer, the dielectric layer having a plurality of openings, a first implanted trench and a second implanted trench, wherein the openings expose the first patterned electrode layer, and the first implanted trench and the The second injection trenches are respectively communicated with some of these openings; and a first liquid organic functional material and a second liquid organic are respectively injected. 11204twf.ptd Page 19, 200428689 VI. Patent application scope Functional materials in the first injection groove and the second injection groove, so that the first-liquid organic functional material flows to the part communicating with the first injection groove Share the openings to form a first organic light emitting element layer, and the second liquid organic functional material flows to a portion of the openings communicating with the second injection trench to form a second organic light emitting element layer; Forming a third organic light emitting element layer in the remaining openings where the first organic light emitting element layer is not formed; and in the first organic light emitting element layer, the second organic light emitting element layer, and the third organic light emitting element layer A second patterned electrode layer is formed thereon. 20. The method for manufacturing an organic electroluminescent device array according to item 19 of the scope of patent application, wherein the dielectric layer is formed and the first organic light-emitting element layer, the second organic light-emitting element layer and the first organic light-emitting element layer are formed. An electrode separation layer is formed between the three organic light emitting element layers and on the dielectric layer between the openings. 2 1. The method for manufacturing an organic electroluminescent device array according to item 19 of the scope of patent application, wherein the method of injecting the first liquid organic functional material and the second liquid organic functional material includes dripping and ink jetting. 2 2. The method for manufacturing an organic electroluminescent device array according to item 19 of the scope of patent application, wherein the method for forming the third organic light emitting device layer includes a steamed clock. 11204twf.ptd Page 20