Blocking Elements in OLED Substrates to Reduce Color Mixing
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Solution Overview
Problem
Conventional organic light-emitting display substrates face issues with color mixing and uneven light emission due to evaporation shadows between sub-pixels emitting different colors, affecting display quality.
Innovation Solution
Incorporating blocking elements between adjacent sub-pixels, which are strategically positioned and shaped to block the evaporating material, preventing color mixing and ensuring uniform distribution of the organic light-emitting layer, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If blocking elements are added between adjacent sub-pixels to prevent color mixing, then display quality is improved, but device complexity increases
Solution Approach 1:
The blocking element serves as an intermediary structure positioned between adjacent sub-pixels emitting different colors. This mediator prevents the evaporation shadow from one sub-pixel from affecting the organic light-emitting layer of the adjacent sub-pixel, thereby eliminating color mixing while maintaining a relatively simple overall device architecture
Solution Approach 2:
The blocking element is designed as a segmented structure that divides the evaporation shadow region from affecting adjacent sub-pixels. By segmenting the evaporation path and blocking it at specific locations, the patent prevents color mixing without requiring complete structural redesign of the entire display device
2Manufacturing precision
If blocking elements are positioned to block evaporation shadow, then color mixing is reduced, but manufacturing complexity increases
Solution Approach 1:
The blocking element is pre-positioned on the base substrate before the organic light-emitting layers are formed. This preliminary action ensures that when the organic light-emitting materials are evaporated, the blocking element is already in place to prevent shadow effects and color mixing, simplifying the manufacturing process by avoiding post-processing adjustments
Solution Approach 2:
The blocking element is strategically positioned only at specific locations where evaporation shadows from adjacent sub-pixels would affect the organic light-emitting layer. This local quality approach blocks color mixing only where necessary, rather than implementing uniform blocking across the entire display, thereby reducing manufacturing complexity
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 reduces color mixing and uneven light emission, enhancing the display quality of organic light-emitting devices by preventing material overlap during the evaporation process.
Implementation Method 1
preventing color mixing and ensuring uniform distribution of the organic light-emitting layer during the evaporation process
Data Source
AI summary
An organic light-emitting display substrate, a manufacturing method therefor, and an organic light-emitting display device. The organic light-emitting display substrate comprises a base substrate and multiple sub-pixels that are located on the base substrate and that are arranged in an array manner. Each sub-pixel comprises an organic light-emitting layer. At least one blocking element is disposed between two adjacent sub-pixels that emit light of different colors.