Insulating Layer Covers LED Side Surfaces to Stop Film Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face issues with film separation and crosstalk, particularly in high-resolution applications, which affect the manufacturing yield and viewing angle.
Innovation Solution
A display device structure is implemented where an insulating layer covers the light-emitting device, including a region in contact with the insulating layer positioned on the formation surface, to inhibit film separation. Additionally, the light-emitting devices are processed using a lithography process to form red, green, and blue light-emitting units separately, reducing leakage current and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an opening of an insulating layer is filled with an adhesive layer, then film separation is inhibited to some extent, but film separation still occurs in some cases and the structure is insufficient
Solution Approach 1:
The insulating layer extends not only horizontally but also vertically to cover the side surface of the light-emitting device. This three-dimensional extension provides adhesion strength from multiple directions (bottom and side surfaces), preventing film separation more effectively than a simple horizontal filling approach.
Solution Approach 2:
The insulating layer acts as an intermediary structure that provides adhesion between the light-emitting device and the underlying substrate. By extending to cover the side surface, it creates a more robust intermediate bonding interface that prevents delamination during substrate separation.
2Manufacturing precision
If a light-emitting apparatus using an EL element is used to increase resolution, then display definition is improved, but film separation occurs during substrate separation process
Solution Approach 1:
The insulating layer is designed to extend vertically along the side surface of the light-emitting device in addition to its horizontal coverage. This vertical extension creates a three-dimensional adhesion structure that prevents film separation during substrate processing, thereby improving manufacturing yield while maintaining high resolution.
Solution Approach 2:
The insulating layer is formed to cover the side surface of the light-emitting device before the substrate separation process. This preliminary protective structure is in place during subsequent manufacturing steps, preventing film separation issues that would otherwise occur during substrate separation.
3Illumination intensity
If color filters are used with white light-emitting elements, then display color is achieved, but crosstalk and narrow viewing angle are caused
Solution Approach 1:
The patent removes the color filter layer from the display structure and relies solely on the light-emitting devices to emit red, green, and blue light directly. This extraction of the color filter eliminates the crosstalk and narrow viewing angle problems associated with color filters, while the lithography process ensures precise light emission from each pixel.
Data Source
AI summary
A display device in which film separation is sufficiently inhibited is provided. The display device includes a first insulating layer and a second insulating layer, a first light-emitting device positioned over the first insulating layer, a second light-emitting device positioned over the second insulating layer, and a third insulating layer including a region covering part of a side surface of the first light-emitting device, a region covering part of the bottom surface of the first insulating layer, a region covering part of the bottom surface of the second insulating layer, and a region covering part of a side surface of the second light-emitting device. The first light-emitting device has a tandem structure and the second light-emitting device has a single structure.