OLED Display Substrate Crack Resistance via Segmented Insulating Layers
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Solution Overview
Problem
OLED display substrates are prone to cracking during handling due to external forces, which affects their quality, performance, and service life.
Innovation Solution
A display substrate design featuring a base substrate with alternating first and second insulating layers in the non-display area, where the first and second slots are filled with flexible hydrophobic materials like polyvinylidene fluoride or polyurethane, preventing crack expansion by dispersing lateral tensile stress and blocking moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the OLED display substrate is cut or handled after packaging of the electroluminescent structure is completed, then the manufacturing process can be finished, but a crack is easily generated in the OLED display substrate due to external force
Solution Approach 1:
The patent introduces first and second slots (divisions) in the insulating layers above the pixel electrodes. These slots segment the continuous insulating structure, creating discontinuities that prevent crack propagation across the entire substrate while allowing the manufacturing process to complete
Solution Approach 2:
The patent pre-fills the slots with filler materials (such as resin or rubber) before the substrate is subjected to external forces during handling. This beforehand cushioning provides stress distribution and crack arrest capability, preventing external forces from generating catastrophic cracks in the substrate
2Ease of manufacture
If a crack is generated in the OLED display substrate, then the substrate can be processed, but the crack will extend and expand into an inside of the OLED display substrate affecting quality and service life
Solution Approach 1:
The slots in the insulating layers segment the potential crack propagation path. When a crack encounters the slot, it is arrested or deflected because the discontinuity in the insulating layer breaks the continuous stress field, preventing the crack from extending into the internal structure affecting quality
Solution Approach 2:
The filler material in the slots acts as an intermediary between the external stress and the internal substrate structure. When stress is applied, the filler material absorbs and distributes the stress, preventing direct stress transmission that would cause crack expansion into the substrate interior
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents crack propagation, enhancing the quality and performance of OLED display substrates while extending their service life by mitigating mechanical stress and moisture exposure.
Implementation Method 1
preventing crack expansion by dispersing lateral tensile stress
Implementation Method 2
flexible hydrophobic materials like polyvinylidene fluoride or polyurethane, preventing crack expansion by dispersing lateral tensile stress and blocking moisture penetration
Data Source
AI summary
Embodiments of the present disclosure provide a display substrate, a method of manufacturing a display substrate, and a display apparatus. The display substrate includes a display area and a non-display area. The display substrate further includes: a base substrate; and a first insulating layer and a second insulating layer disposed on the base substrate in sequence. The first insulating layer includes a first slot located in the non-display area and filled with a first filler, and the second insulating layer includes a second slot located in the non-display area.