KR-20260062174-A - Micro Light emitting diode(LED) display device and method of fabricating the same

Abstract

A display device according to an embodiment of the present specification may include a display area comprising a plurality of pixels on a substrate, a plurality of insulating layers disposed in the display area, a first bank and a second bank disposed on the plurality of insulating layers, a first electrode disposed on the first bank and the second bank, and at least one micro LED disposed on the first bank and the second bank, a first optical layer surrounding a portion of the first bank and the second bank and the at least one micro LED, and a connecting electrode disposed on the first bank, and may include a second electrode disposed on the upper surface and side surface of the first optical layer and connected to the connecting electrode. A method for manufacturing a display device according to an embodiment of the present specification comprises the steps of forming a pixel driving circuit on a substrate, forming a plurality of insulating layers on the pixel driving circuit, forming a first bank and a second bank on the plurality of insulating layers, forming a connecting electrode on the first bank, and arranging at least one micro LED on the first bank and the second bank, and forming a first optical layer surrounding the first bank and the second bank and at least one micro LED, and arranging a second electrode on the first optical layer, wherein the second electrode is connected to the connecting electrode on the first bank, and the connecting electrode and the second electrode may be formed extending along the side of the first bank.

Inventors

• 김태윤
• 정혜선
• 김병구
• 안형호
• 이희원
• 조준영

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260507

Application Date

20241025

Claims (18)

1. Substrate; A display area including a plurality of pixels on the above substrate; A plurality of insulating layers disposed in the above-mentioned display area; A first bank and a second bank disposed on the plurality of insulating layers; A first electrode disposed on the first bank and the second bank; At least one micro LED disposed on the first bank and the second bank; A first optical layer surrounding the first bank, the second bank, and a portion of the at least one micro LED; A connecting electrode disposed on the first bank; and A display device comprising a second electrode disposed on the upper and side surfaces of the first optical layer and connected to the connecting electrode.
2. In Article 1, The first bank and the second bank each have a first width in the first direction and a second width in the second direction, and A display device in which the second width of the first bank is larger than the second width of the second bank.
3. In Article 2, A display device in which the first optical layer and the second electrode are arranged to extend in the first direction of the display area.
4. In Paragraph 3, A display device in which the width of the second direction of the second electrode is wider than the second width of the first bank and the second width of the second bank.
5. In Article 1, A display device in which the first optical layer and the second electrode are arranged continuously in the plurality of pixels.
6. In Article 1, The above connecting electrode is arranged to extend along one side of the first bank, and A display device in which the second electrode contacts the connecting electrode extending along one side of the first bank.
7. In Article 1, It further includes a second optical layer disposed on the substrate and disposed on the side of the first optical layer, and A display device wherein the second electrode is disposed between the first optical layer and the second optical layer.
8. In Article 1, A display device further comprising a third optical layer disposed on the second electrode.
9. In Article 1, It further includes a pixel driving circuit disposed on the above substrate, and A display device in which the above-mentioned connecting electrode is electrically connected to the above-mentioned pixel driving circuit.
10. In Article 1, Each of the above plurality of pixels includes a subpixel, and A display device in which the first bank or the second bank is disposed in the above subpixel.
11. In Article 10, A display device in which the width of the second direction of the second electrode is the same for each subpixel.
12. A step of forming a pixel driving circuit on a substrate; A step of forming a plurality of insulating layers on the pixel driving circuit; A step of forming a first bank and a second bank on the plurality of insulating layers; Step of forming a connecting electrode in the first bank A step of placing at least one micro LED on the first bank and the second bank; A step of forming a first optical layer surrounding the first bank, the second bank, and the at least one micro LED; and The method includes the step of placing a second electrode on the first optical layer, The second electrode is connected to the connecting electrode on the first bank, and A method for manufacturing a display device, wherein the connecting electrode and the second electrode are formed by extending along the side of the first bank.
13. In Article 12, A method for manufacturing a display device, wherein the second electrode is formed by extending along the side of the first optical layer.
14. In Article 13, The method further includes the step of forming a second optical layer on the side of the first optical layer on the substrate, A method for manufacturing a display device, wherein the second electrode is disposed between the side of the first optical layer and the second optical layer.
15. In Article 12, A method for manufacturing a display device, further comprising the step of forming a third optical layer on the second electrode.
16. In Article 12, A method for manufacturing a display device in which the first optical layer and the second electrode are extended in a first direction and arranged in a plurality of pixels.
17. In Article 16, A method for manufacturing a display device, wherein the width of the first bank in the second direction intersecting the first direction is wider than the width of the second bank in the second direction.
18. In Article 16, A method for manufacturing a display device, wherein the second electrode is formed by protruding in a second direction intersecting the first direction from a subpixel disposed in each of a plurality of pixels.

Description

LED display device and method of fabricating the same The present invention relates to an LED display device and a method for manufacturing the same, and in particular, to a micro LED display device and a method for manufacturing the same that can improve the phenomenon of electrode splitting or breakage caused by the connection between electrodes when the second electrode is connected to the connecting electrode. With the recent increase in the size of display devices, there is a growing demand for flat panel display devices that occupy less space, and the technology of flat panel display devices is rapidly advancing, including liquid crystal display (LCD) devices and organic electroluminescent display (OLED) devices, which include organic light emitting diodes (OLEDs). Recently, to overcome the above problems of liquid crystal display devices and/or organic light-emitting display devices, LED display devices using LEDs (Light emitting diodes) as light-emitting elements have been proposed. LED display devices may use small LEDs such as mini-LEDs or ultra-small LEDs such as micro-LEDs. These LED display devices create images by placing ultra-small LEDs of mini or micro-sized units in each subpixel, offering significant advantages in terms of low power consumption and miniaturization. In the case of a vertical structure LED in which the upper cathode of the LED is connected to the second electrode and the lower anode of the LED is connected to the first electrode, the LED can be positioned and the second electrode placed above the LED so that the pixel driving circuit of the substrate and the cathode of the LED can be electrically connected. The LED and an insulating layer can be positioned on the pixel driving circuit of the substrate, and a contact hole in the insulating layer can be formed for electrical connection between the second electrode and the pixel driving circuit. As the second electrode is formed inside the contact hole to be connected to the pixel driving circuit at the bottom of the contact hole, a crack may occur in the second electrode depending on the depth of the contact hole, causing it to split or break. A method is needed to prevent cracks from occurring in this second electrode. FIG. 1 is an exploded perspective view of a display device according to one embodiment of the present specification. FIG. 2 is a plan view of a display device according to one embodiment of the present specification. Figure 3 is a plan view of a display device with an enlarged view of the 3rd area of Figure 2. FIG. 4 is a cross-sectional view along A-A' of FIG. 3 according to one embodiment of the present specification. FIG. 5 is a plan view of a display device according to one embodiment of the present specification. FIG. 6 is an enlarged view of a light-emitting element according to one embodiment of the present specification. FIG. 7a is a cross-sectional view according to a-a' of FIG. 5 according to one embodiment of the present specification. FIG. 7b is a cross-sectional view according to b-b' of FIG. 5 according to one embodiment of the present specification. FIG. 7c is a cross-sectional view according to c-c' of FIG. 5 according to one embodiment of the present specification. FIG. 8 is a plan view of a display device according to another embodiment of the present specification. FIG. 9a is a cross-sectional view according to a1-a1' of FIG. 8 according to another embodiment of the present specification. FIG. 9b is a cross-sectional view according to b1-b1' of FIG. 8 according to another embodiment of the present specification. FIG. 10 is a plan view showing a display device according to an embodiment of the present invention. The advantages and features of this specification and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, this specification is not limited to the embodiments disclosed below but may be implemented in various different forms, and these embodiments are provided merely to ensure that the disclosure of this specification is complete and to fully inform those skilled in the art of the scope of the invention. Shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of this specification are exemplary and are not limited to the depicted items. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing this specification, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of this specification, such detailed description is omitted. Where terms such as “comprising,” “having,” or “consisting of” are used in this specification, other parts may be added unless terms such as “only” are used. Where a component is expressed in the singular, it includes cases where it is included in the plural unless specifically stated otherwise. In interp