EP-4739042-A1 - DISPLAY DEVICE AND MANUFACTURING METHOD THEREFOR

Abstract

The present disclosure is applicable to the technical field related to a display device, and for example, relates to a display device using a Light Emitting Diode (LED) and a manufacturing method thereof. A display device according to an embodiment of the present disclosure may include: a substrate; a plurality of light-emitting elements partitioned on the substrate to constitute a plurality of unit pixels; a black layer disposed between the individual light-emitting elements; an encapsulation layer formed on the substrate to cover the plurality of light-emitting elements; a first scattering layer disposed on the encapsulation layer and comprising first filler particles; a transparent layer disposed on the first scattering layer; and a second scattering layer disposed on the transparent layer and comprising second filler particles having a size larger than a size of the first filler particles.

Inventors

• LEE, SUNJU
• LEE, DOHYUNG
• PARK, SANGDAE
• YUH, HWANKUK
• LEE, Jaechoon

Assignees

• LG Electronics Inc.

Dates

Publication Date

20260506

Application Date

20240701

Claims (15)

1. A display device comprising: a substrate; a plurality of light-emitting elements partitioned on the substrate to constitute a plurality of unit pixels; a black layer disposed between the individual light-emitting elements; an encapsulation layer formed on the substrate to cover the plurality of light-emitting elements; a first scattering layer disposed on the encapsulation layer and including first filler particles; a transparent layer disposed on the first scattering layer; and a second scattering layer disposed on the transparent layer and including second filler particles having a size larger than a size of the first filler particles.
2. The display device of claim 1, wherein the second scattering layer is disposed on a transparent base.
3. The display device of claim 1, wherein the transparent base is adhered to the encapsulation layer by a transparent adhesive layer.
4. The display device of claim 1, wherein a size ratio of the first filler particles to the second filler particles is 0.05 to 0.15.
5. The display device of claim 1, wherein the first filler particles comprise at least one of Zr, Si, Ti, Zn, BaS, or oxide thereof.
6. The display device of claim 1, wherein a content of the first filler particles is greater than 0 and 50% by mass or less relative to the first scattering layer.
7. The display device of claim 1, wherein a size of the first filler particles is 300 to 800 nm.
8. The display device of claim 1, wherein the first scattering layer has an area corresponding to the unit pixel.
9. The display device of claim 1, wherein the first scattering layer has an area corresponding to the individual light-emitting element.
10. The display device of claim 9, wherein each first scattering layer is disposed with a first interval.
11. The display device of claim 10, wherein the first interval defines a width at which the black layer is opened.
12. A method of manufacturing a display device, comprising: providing a wiring substrate including a substrate, a plurality of light-emitting elements partitioned on the substrate to constitute a plurality of unit pixels, a black layer disposed between the individual light-emitting elements, and an encapsulation layer formed on the substrate to cover the plurality of light-emitting elements; forming a first scattering layer on the encapsulation layer, the first scattering layer comprising a first base material in which first filler particles are dispersed; providing an optical layer including a second scattering layer comprising a second base material in which second filler particles having a size larger than a size of the first filler particles are dispersed, the second scattering layer being disposed on a first surface of a transparent base, and a transparent adhesive layer disposed on a second surface of the transparent base; and attaching the transparent adhesive layer of the optical layer onto the first scattering layer.
13. The method of claim 12, wherein the providing of the wiring substrate and the providing of the optical layer are performed independently.
14. The method of claim 12, wherein the forming of the first scattering layer is performed to have an area locally covering the individual light-emitting element.
15. The method of claim 12, wherein the forming of the first scattering layer is performed to have an area corresponding to the unit pixel.

Description

[Technical Field] The present disclosure is applicable to the technical field related to a display device, and for example, relates to a display device using a Light Emitting Diode (LED) and a manufacturing method thereof. [Background Art] As the information society develops, demands for display devices are increasing in various forms. In response to this, various display devices such as a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), an Electroluminescent Display (ELD), a Vacuum Fluorescent Display (VFD), an Organic Light Emitting Diode (OLED), and a Micro Light Emitting Diode (Micro-LED) have been recently researched and used. Digital signage refers to a display device that provides specific information as well as broadcast programs in public places such as airports, hotels, hospitals, and subway stations as a communication tool that can induce not only general TV but also corporate marketing, advertising, training effects, and customer experience. Digital signage is a medium for expressing various contents and commercial advertisements by installing display panels such as a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), an Organic Light Emitting Diode (OLED), and a Micro Light Emitting Diode (Micro-LED) in indoor or outdoor specific places or devices such as street furniture. It can be disposed in paths where the public moves, such as apartment elevators, subway stations, inside subways, inside buses, universities, banks, convenience stores, discount stores, and shopping malls, as well as homes. Recently, as digital signage becomes larger and ultra-larger, many studies have been conducted to improve the image quality of display panels. In particular, an optical layer for improving optical characteristics of a display panel may be provided, but distortion phenomena such as sparkling may occur due to a scattering material included in such an optical layer to reduce reflectance. Accordingly, a way to solve these problems is emerging. [Invention] [Technical Problem] According to an embodiment of the present disclosure, it is an object to provide a display device and a manufacturing method thereof that can prevent or reduce image quality degradation while providing a scattering layer of the display device. Meanwhile, according to an embodiment of the present disclosure, it is an object to provide a display device and a manufacturing method thereof that can prevent or reduce a decrease in black feeling while providing a scattering layer of the display device. [Technical Solution] A display device according to an embodiment of the present disclosure may include: a substrate; a plurality of light-emitting elements partitioned on the substrate to constitute a plurality of unit pixels; a black layer disposed between the individual light-emitting elements; an encapsulation layer formed on the substrate to cover the plurality of light-emitting elements; a first scattering layer disposed on the encapsulation layer and comprising first filler particles; a transparent layer disposed on the first scattering layer; and a second scattering layer disposed on the transparent layer and comprising second filler particles having a size larger than a size of the first filler particles. A display device according to an embodiment of the present disclosure may include: a wiring substrate including a substrate, a plurality of light-emitting elements partitioned on the substrate to constitute a plurality of unit pixels, a black layer disposed between the individual light-emitting elements, and an encapsulation layer formed on the substrate to cover the plurality of light-emitting elements; a scattering layer disposed on the wiring substrate at a position corresponding to the unit pixel and comprising first filler particles; a transparent adhesive layer disposed on the scattering layer; and an AG coating layer disposed on the transparent adhesive layer and comprising second filler particles having a size larger than a size of the first filler particles. A method of manufacturing a display device according to an embodiment of the present disclosure may include: providing a wiring substrate including a substrate, a plurality of light-emitting elements partitioned on the substrate to constitute a plurality of unit pixels, a black layer disposed between the individual light-emitting elements, and an encapsulation layer formed on the substrate to cover the plurality of light-emitting elements; forming a first scattering layer on the encapsulation layer, the first scattering layer comprising a first base material in which first filler particles are dispersed; providing an optical layer in which a second scattering layer comprising a second base material in which second filler particles having a size larger than a size of the first filler particles are dispersed is disposed on a first surface of a transparent base, and a transparent adhesive layer is disposed on a second surface of the transparent base; and attac