Flexible Display Organic Emission Layer Molecular Weight Gradient
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Solution Overview
Problem
Flexible display devices face durability issues when bent or folded repeatedly, particularly in regions subjected to stress, leading to deformation and characteristic deterioration.
Innovation Solution
A display device design featuring a substrate with distinct regions: a bending region with organic emission layers formed using high molecular weight materials via a solution process and non-bending regions with lower molecular weight materials deposited using a different process, along with varying electrode thicknesses to minimize stress and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display device is bent or folded repeatedly, then the device becomes more adaptable and portable, but the bending region suffers from stress-induced degradation and reduced durability
Solution Approach 1:
The patent applies different molecular weight organic materials to different regions of the display device. High molecular weight materials are used in bending regions to provide stress resistance and prevent degradation, while low molecular weight materials are used in non-bending regions to maintain good manufacturing characteristics. This local differentiation allows the device to be flexible without compromising overall durability.
2Reliability
If high molecular weight organic materials are used in bending regions, then stress resistance and durability are improved, but manufacturing complexity increases due to different deposition processes
Solution Approach 1:
The manufacturing process is segmented into different deposition methods for different regions. The patent uses a solution process for depositing high molecular weight organic materials in bending regions, while using a deposition process for low molecular weight materials in non-bending regions. This segmentation allows each region to receive the most appropriate material and processing method, optimizing both durability and manufacturability.
3Ease of manufacture
If uniform organic materials are used across the entire display device, then manufacturing is simplified, but bending regions cannot withstand repeated folding without degradation
Solution Approach 1:
The patent implements local quality by assigning different organic materials with different molecular weights to different functional regions. Bending regions receive high molecular weight materials that provide stress resistance and prevent degradation during repeated folding, while non-bending regions receive low molecular weight materials that are easier to manufacture. This regional differentiation resolves the contradiction between manufacturing simplicity and bending region durability.
Data Source
AI summary
A display device, including a substrate having a first region and second regions; transistors on the substrate in the first region and the second regions; first electrodes each connected to the transistors; an organic emission layer on the first electrodes; and second electrodes on the organic emission layer, molecular weights of organic materials of the organic emission layer in the first region and the organic emission layer in the second regions being different from each other.