Multilayer Blue OLED Structure for Burn-In Reduction
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Solution Overview
Problem
Organic light-emitting display apparatuses face issues with the short lifespan of blue pixels leading to burn-in phenomena and shadow effects due to reduced pixel spacing in high-resolution displays, which affect performance and reliability.
Innovation Solution
The apparatus features a multilayered blue light-emitting layer and a common green light-emitting layer shared by both blue and red pixels, with specific charge-providing layers and an optical resonance layer to extend blue pixel lifespan and reduce shadowing by minimizing precise patterning needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer blue light-emitting layer is used, then the manufacturing process is simple, but the lifespan of blue pixels is short causing burn-in phenomena
Solution Approach 1:
The blue light-emitting layer is divided into multiple sub-layers (first blue light-emitting layer and second blue light-emitting layer) with different lifespans and emission characteristics. This segmentation allows each sub-layer to contribute differently to the overall blue emission, extending the effective lifespan of blue pixels while maintaining manufacturing feasibility through sequential deposition processes.
2Manufacturing precision
If pixel spacing is reduced for high-resolution displays, then display resolution is improved, but shadow phenomena occur due to deposition on adjacent pixels
Solution Approach 1:
The patent introduces a vertical stacking dimension by creating multiple blue light-emitting layers at different positions and orientations. This dimensional approach allows the blue emission to be distributed across multiple layers rather than concentrated in a single plane, reducing the shadow effect on adjacent pixels while maintaining high horizontal resolution.
3Manufacturing precision
If precise patterning is performed to prevent color mixture, then color purity is improved, but manufacturing complexity and workload increase significantly
Solution Approach 1:
Instead of requiring precise patterning for the entire blue light-emitting structure, the patent applies partial patterning only to specific regions where color mixture prevention is critical. The multi-layer blue structure allows some areas to have relaxed patterning requirements, reducing overall manufacturing complexity while maintaining acceptable color purity through the cumulative effect of multiple layers.
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
This configuration significantly extends the life span of blue pixels, suppresses burn-in and shadow phenomena, and enhances the reliability and performance of the display by maintaining consistent brightness and reducing color mixture risks.
Implementation Method 1
an organic light-emitting apparatus may implement a color based on a principle in which a hole and an electron are injected by an anode and a cathode, respectively, and then recombined with each other in a light-emitting layer to thereby emit light
Implementation Method 2
an optical resonance layer between the third color light-emitting layer and the first charge-providing layer
Data Source
AI summary
An organic light-emitting display apparatus and a method of manufacturing the same are provided. An organic light-emitting display apparatus includes a first light-emitting unit including a first color light-emitting layer on an area of a substrate, a second light-emitting unit including a second color light-emitting layer spaced apart from the first color light-emitting layer, and a third light-emitting unit including a third color light-emitting layer as a common layer corresponding to both areas of the first color light-emitting layer and the second color light-emitting layer, and the first color light-emitting layer includes a lower light-emitting layer and an upper light-emitting layer that are stacked to have a multilayered structure.