OLED Sealing Member Laser Curing Block Pattern
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Solution Overview
Problem
The mechanical strength of the sealing member in organic light emitting display (OLED) devices is compromised due to uneven thermal energy distribution during the curing process, as the laser radiation concentrates heat at the center rather than uniformly across the sealing member, leading to stress and reduced mechanical integrity.
Innovation Solution
A block pattern is arranged on the second substrate surrounding the sealing member, which blocks a portion of the incident laser radiation, preventing excessive heating at the center and ensuring more uniform heat distribution across the sealing member during the curing process, thereby enhancing mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser beam is used to cure the sealing member, then curing efficiency is improved, but thermal energy concentrates at the center causing reduced mechanical strength
Solution Approach 1:
The patent introduces a block pattern structure with varying optical properties at different locations. The block pattern includes a first block with higher optical density and a second block with lower optical density, creating local quality variations that control laser energy distribution. This resolves the contradiction by allowing efficient curing where needed while preventing excessive heat concentration at the center that would compromise mechanical strength.
2Speed
If thermal energy is concentrated at the center of the sealing member, then curing speed at the center is improved, but uniformity of thermal distribution deteriorates
Solution Approach 1:
The block pattern creates local quality variations in optical density across the sealing member structure. The first block with higher optical density slows laser penetration in specific regions, while the second block with lower optical density allows faster penetration in other regions. This local differentiation achieves uniform thermal distribution across the entire sealing member while maintaining overall curing speed.
3Stability of the object's composition
If block pattern is added to block laser radiation, then thermal uniformity is improved, but device complexity increases
Solution Approach 1:
The block pattern serves multiple functions simultaneously: it acts as a laser radiation modulator to achieve uniform thermal distribution, provides structural support within the sealing member, and can be integrated with existing manufacturing processes. This multi-functionality resolves the contradiction by achieving thermal uniformity without proportionally increasing device complexity.
Solution Approach 2:
The block pattern is formed using composite structures with different optical densities. The first block and second block use materials or structures with varying laser transmission properties, creating a composite system that controls thermal distribution. This approach achieves thermal uniformity through material composition rather than complex mechanical structures.
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 block pattern effectively disperses thermal energy uniformly across the sealing member, reducing mechanical stress and enhancing the overall mechanical strength of the OLED device by preventing excessive heat concentration at the center during the curing process.
Implementation Method 1
the block pattern being configured to prevent central axes of the sealing member from receiving more laser radiation than other portions of the sealing member during a curing process by blocking a portion of incident laser radiation directed towards the central axes of the sealing member
Implementation Method 2
the sealing member may be heated and cured by a laser beam. A thermal energy generated by the laser beam
Data Source
AI summary
An organic light emitting display (OLED) device that includes a first substrate and a second substrate. An organic light emitting element and a sealing member are formed between the first substrate and the second substrate. A touch panel, a block pattern, and a protective layer are formed on the second substrate. The block pattern is arranged above the sealing member to prevent a center of the sealing member from being excessively illuminated by a laser beam during a curing process.