OLED Encapsulation Layer Segmentation for Crack Arrest
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The encapsulation layer in OLED display mother-substrates is prone to damage when cut along a cutting line, leading to cracks that can extend into the display area, compromising the reliability of the resulting display substrate due to inadequate encapsulation of sensitive organic light emitting diode materials.
Innovation Solution
Incorporating a spacer component in the non-display area between the cutting line and the display area, which is designed to make the encapsulation layer discontinuous at the cutting line, preventing cracks from propagating into the display area during the cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer is continuous across the cutting line, then the encapsulation provides complete protection, but cracks can propagate into the display area during cutting
Solution Approach 1:
The encapsulation layer is divided into multiple segments: a first encapsulation layer portion over the display area, a second encapsulation layer portion over the non-display area, and intentionally discontinuous at the cutting line position. This segmentation prevents crack propagation from the cutting line into the display area while maintaining encapsulation protection in both regions.
Solution Approach 2:
A spacer component is introduced as an intermediary element positioned between the first and second encapsulation layer portions at the cutting line. The spacer component creates a physical gap that acts as a barrier to crack propagation, while the encapsulation layers maintain their protective functions in各自的 regions.
2Object-affected harmful factors
If the encapsulation layer is discontinuous at the cutting line, then crack propagation is prevented, but the encapsulation coverage is reduced
Solution Approach 1:
The encapsulation layer is segmented into two separate portions that do not overlap at the cutting line. The first portion covers the display area and the second portion covers the non-display area, with a deliberate gap at the cutting line position. This segmentation strategy prevents crack propagation while maintaining adequate encapsulation coverage in both functional areas.
Solution Approach 2:
The encapsulation structure has different configurations in different regions: continuous coverage over the display area and non-display area respectively, with discontinuity only at the cutting line position. This local quality approach ensures protection where needed while allowing crack arrest at the cutting line.
3Reliability
If the spacer component is positioned close to the display area, then crack propagation is effectively blocked, but the spacer occupies valuable space
Solution Approach 1:
The spacer component is extracted and positioned specifically in the non-display area, adjacent to the cutting line but not encroaching on the display area. This placement effectively blocks crack propagation from the cutting line while minimizing the space occupied by the spacer component, as it utilizes the existing non-display area space.
Solution Approach 2:
The spacer component serves as an intermediary barrier positioned at the interface between the cutting line and the display area. By placing it in the non-display area, it effectively mediates crack propagation prevention while occupying minimal space that would otherwise be unused.
Data Source
AI summary
The present application provides display mother-substrate, method of manufacturing display mother-substrate, display substrate and display apparatus. The display mother-substrate is configured to be cut along cutting line to obtain display substrate, has display area and non-display area, and includes: a base substrate; a plurality of light emitting elements on the base substrate and in the display area; an encapsulation layer for encapsulating the plurality of the light emitting elements on a side of the plurality of light emitting elements away from the base substrate and in both of the display area and the non-display area; a spacer component in the non-display area and on a side of the encapsulation layer close to the base substrate. At least a part of the spacer component is between the cutting line and the display area. The encapsulation layer is discontinuous at a position between the cutting line and the display area.