OLED Display Panel Varying Conductive Pattern Zones Sealant Adhesion
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Solution Overview
Problem
The penetration of water vapor and oxygen into organic light-emitting diode (OLED) display panels leads to deterioration, requiring effective sealing to maintain operational lifetime and electrical performance, but existing sealing processes face challenges due to thermal conductivity differences between metal and non-metal regions, causing sealant cracking and insufficient adhesion.
Innovation Solution
A display panel design featuring varying conductive pattern zones at metal and non-metal regions, with specific arrangements of conductive portions and supplemental conductive nets to minimize thermal conductivity differences, ensuring better sealant adhesion and preventing defects during the sealing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealant dispensing area extends across metal regions during assembly, then the sealing process can be completed, but the high thermal conductivity of metal regions causes uneven temperature distribution in the sealant, leading to crack formation and insufficient adhesion
Solution Approach 1:
The patent applies local quality by creating a non-uniform conductive pattern structure where the conductive material is distributed differently in metal regions versus non-metal regions. Specifically, the conductive pattern has reduced conductivity in metal regions and enhanced conductivity in non-metal regions, achieving local optimization of thermal properties to balance temperature distribution across the sealant dispensing area while maintaining electrical conductivity where needed
Solution Approach 2:
The patent changes the thermal conductivity parameter of the conductive pattern in different regions. By adjusting the conductive material's distribution density, trace width, or material composition in metal versus non-metal regions, the effective thermal conductivity is modified to compensate for the inherent thermal conductivity differences between metal and non-metal substrate regions, thereby achieving uniform temperature distribution during sealing
2Reliability
If the conductive pattern has high thermal conductivity in metal regions, then electrical performance is maintained, but thermal conductivity differences between metal and non-metal regions cause sealant cracking during laser melting
Solution Approach 1:
The conductive pattern is designed with local quality variations: in metal regions, the pattern maintains sufficient conductivity for electrical performance, while in non-metal regions, the pattern provides enhanced thermal conductivity to compensate for the lower thermal conductivity of the non-metal substrate. This local optimization prevents sealant cracking by ensuring uniform heat distribution during laser melting without compromising electrical functionality
Solution Approach 2:
The conductive pattern functions as a composite structure combining conductive material with the substrate material. By carefully designing the composite's geometry, material composition, and distribution, the pattern achieves dual functionality: maintaining electrical conductivity in metal regions while providing thermal conductivity enhancement in non-metal regions, thereby resolving the conflict between electrical performance and thermal uniformity
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 design enhances sealant adhesion, increases packaging yield, and prolongs the display panel's operational life by buffering thermal conductivity differences, thus improving electrical performance and reliability.
Implementation Method 1
minimize the differences in thermal conductivities between the metal region and the non-metal region
Implementation Method 2
the sealant is typically irradiated and melted by the laser
Implementation Method 3
Some of the laser energy is absorbed and/or reflected by the metal portions which creates an uneven temperature distribution in the frit
Data Source
AI summary
An organic electroluminescence display panel includes a substrate, an organic light-emitting layer disposed on the substrate, a first conductive pattern with a plurality of first meshes disposed on the substrate, a second conductive pattern with a plurality of second meshes disposed on the substrate and separated from the first conductive pattern, and a sealant dispensing area overlapped with the first conductive pattern and the second conductive pattern. A distance between two adjacent meshes of the first meshes is different from a distance between two adjacent meshes of the second meshes.