KR-102964446-B1 - Display device and method for manufacturing of the same

KR102964446B1KR 102964446 B1KR102964446 B1KR 102964446B1KR-102964446-B1

Abstract

The present invention relates to a display device and a method for manufacturing the same. A display device according to one embodiment includes a first electrode disposed on a substrate, a bank covering the edge of the first electrode, a plurality of light-emitting elements disposed on the first electrode and arranged perpendicularly to the first electrode, a conductive polymer layer disposed on the first electrode and filled between the plurality of light-emitting elements, an insulating layer disposed on the conductive polymer layer and filled between the plurality of light-emitting elements, and a second electrode disposed on the bank, the insulating layer, and the plurality of light-emitting elements.

Inventors

노수귀

Assignees

삼성디스플레이 주식회사

Dates

Publication Date: 20260513
Application Date: 20201130

Claims (20)

A first electrode disposed on a substrate; A bank covering the edge of the first electrode; A plurality of light-emitting elements disposed on the first electrode and arranged perpendicularly to the first electrode; A conductive polymer layer disposed on the first electrode and filled between the plurality of light-emitting elements; An insulating layer disposed on the conductive polymer layer and filled between the plurality of light-emitting elements; and A display device comprising the bank, the insulating layer, and a second electrode disposed on the plurality of light-emitting elements.
In Article 1, A display device in which one end of each of the plurality of light-emitting elements contacts the first electrode.
In Article 2, The light-emitting element is a display device comprising a lower portion and an upper portion that are partitioned based on a reference line crossing a portion corresponding to 50% of the length of the light-emitting element.
In Paragraph 3, A display device in which the conductive polymer layer contacts the lower part of the light-emitting element, and the thickness of the conductive polymer layer is 20 to 40% of the length of the light-emitting element.
In Paragraph 3, A display device in which the insulating layer contacts the upper portion of the light-emitting element and exposes the other end of each of the plurality of light-emitting elements.
In Article 5, A display device in which the thickness of the insulating layer is 40 to 70% of the length of the light-emitting element.
In Paragraph 3, A display device in which the other end of each of the plurality of light-emitting elements above contacts the second electrode.
In Article 1, A display device in which the above plurality of light-emitting elements are spaced apart from each other and randomly arranged on a plane.
In Article 1, A display device in which the length of the light-emitting element is smaller than the thickness of the bank.
In Article 2, The other end of the light-emitting element is a display device protruding above the upper surface of the insulating layer.
In Article 2, A display device in which the other end of the light-emitting element is mutually aligned and matched with the upper surface of the insulating layer.
In Article 1, It further includes a reflective electrode disposed between the first electrode and the plurality of light-emitting elements, The above-mentioned reflective electrode is a display device that contacts the upper surface of the first electrode and the side of the bank.
In Article 12, The above insulating layer is a display device covering the above reflective electrode.
In Article 1, The light-emitting element comprises a first semiconductor layer, a second semiconductor layer, and at least one light-emitting layer disposed between the first semiconductor layer and the second semiconductor layer, and A display device in which the first semiconductor layer, the second semiconductor layer, and the at least one light-emitting layer are surrounded by an insulating film.
A step of growing a plurality of light-emitting elements on a base substrate; A step of attaching a polymer film containing porogen to the plurality of light-emitting elements; A step of heat-treating the base substrate to melt the polymer film and forming a polymer layer that surrounds one end of the plurality of light-emitting elements; A step of separating the plurality of light-emitting elements and mixing them into a light-emitting element ink containing a conductive polymer; A step of preparing a target substrate including a first electrode and a bank, and applying the light-emitting element ink onto the first electrode; A step of drying the light-emitting element ink to form a conductive polymer layer on the first electrode, and aligning the plurality of light-emitting elements perpendicularly to the first electrode; A step of forming an insulating layer on the conductive polymer layer; A step of removing the polymer layer of the plurality of light-emitting elements; and A method for manufacturing a display device comprising the step of forming a second electrode on the plurality of light-emitting elements.
In Article 15, The above polymer film is manufactured from a polymer resin composition comprising a polymer resin and the porogen, and The above polymer resin is included in an amount of 15% to 30% by weight based on 100% by weight of the above polymer resin composition, and A method for manufacturing a display device in which the above porogen is included in an amount of 10% to 40% by weight relative to 100% by weight of the above polymer resin.
In Article 15, The above-mentioned light-emitting element ink is a method for manufacturing a display device by mixing the plurality of light-emitting elements, the conductive polymer, and a solvent.
In Article 15, A method for manufacturing a display device in which the light-emitting element ink and the insulating layer are applied by an inkjet printing method.
In Article 15, When the light-emitting element ink is applied to the first electrode, the polymer layer formed at one end of the light-emitting element floats above the surface of the light-emitting element ink and is arranged perpendicularly to the first electrode, and A method for manufacturing a display device in which, in the step of drying the light-emitting element ink, the conductive polymer is formed into the conductive polymer layer, and the light-emitting element is mounted on the first electrode in a state arranged perpendicularly to the first electrode.
A step of growing a plurality of light-emitting elements on a base substrate; A step of attaching a polymer film containing porogen to the plurality of light-emitting elements; A step of heat-treating the base substrate to melt the polymer film and forming a polymer layer that surrounds one end of the plurality of light-emitting elements; A step of separating the plurality of light-emitting elements and mixing them into a light-emitting element ink containing a conductive polymer; A step of preparing a substrate including a first electrode and a bank; A step of forming a reflective material layer on the first electrode and the bank; A step of applying the light-emitting element ink onto the reflective material layer; A step of drying the light-emitting element ink to align a conductive polymer layer and a plurality of light-emitting elements on the reflective material layer; A step of etching the polymer layer and the reflective material layer of the plurality of light-emitting elements to remove the polymer layer and form a reflective electrode; A step of forming an insulating layer on the conductive polymer layer and the reflective electrode; and A method for manufacturing a display device comprising the step of forming a second electrode on the plurality of light-emitting elements.

Description

Display device and method for manufacturing of the same The present invention relates to a display device and a method for manufacturing the same. The importance of display devices is increasing along with the development of multimedia. In response to this, various types of display devices, such as Organic Light Emitting Displays (OLEDs) and Liquid Crystal Displays (LCDs), are being used. A device for displaying images of a display device includes a display panel such as an organic light-emitting display panel or a liquid crystal display panel. Among these, as a light-emitting display panel, it may include a light-emitting element; for example, in the case of a light-emitting diode (LED), there are organic light-emitting diodes (OLEDs) that use organic materials as fluorescent materials and inorganic light-emitting diodes that use inorganic materials as fluorescent materials. FIG. 1 is a plan view of a display device according to one embodiment. FIG. 2 is a schematic layout diagram of the circuit of the first substrate of a display device according to one embodiment. FIG. 3 is an equivalent circuit diagram of a pixel of a display device according to one embodiment. FIG. 4 is a cross-sectional view schematically showing a display device according to one embodiment. FIG. 5 is a cross-sectional view schematically showing one pixel of a display device according to one embodiment. FIG. 6 is a perspective view schematically showing a light-emitting element according to one embodiment. Figure 7 is an enlarged view showing area A of Figure 5. Figure 8 is a topographic view of one pixel of Figure 5. FIG. 9 is a cross-sectional view schematically showing another example of a pixel of a display device according to one embodiment. FIG. 10 is a cross-sectional view schematically showing one pixel of a display device according to another embodiment. Figure 11 is an enlarged view schematically showing area B of Figure 10. FIG. 12 is a flowchart illustrating a method for manufacturing a display device according to one embodiment. FIGS. 13 to 25 are drawings showing a method for manufacturing a display device according to one embodiment, by process. FIGS. 26 to 29 are drawings showing a method for manufacturing a display device according to another embodiment, by process. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. When elements or layers are referred to as being "on" another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings for describing embodiments are exemplary and therefore the invention is not limited to the depicted details. Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical scope of the present invention. The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship. Specific embodiments will be described below with reference to the attached drawings. FIG. 1 is a plan view of a display device according to one embodiment. Referring to FIG. 1, a display device (1) according to one embodiment can be applied to various home appliances or Internet of Things devices such as smartphones, mobile phones, tablet PCs, PDAs (Personal Digital Assistants), PMPs (Portable Multimedia Players), televisions, game consoles, wristwatch-type electronic devices, head-mounted displays, monitors of personal computers, laptop computers, car navigation systems, car dashboards, digital cameras, camcorders, external billboards, electronic display boards, medical devices, inspection devices, refrigerators and washing machines, etc. In this specification, a television is described as an example of a display device, and the TV may have high resolution or ultra-high resolution such as HD, UHD, 4K, 8K