OLED Sloped Electrode Light Redirection
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Solution Overview
Problem
Current organic light-emitting display apparatuses face limitations in light efficiency due to the lack of effective structures for redirecting and enhancing light emission, particularly in the design of electrodes and pixel defining layers.
Innovation Solution
The proposed solution involves an organic light-emitting display apparatus with a substrate, an insulating layer featuring a recess with a sloped sidewall, a first electrode, an organic emission layer, and a second electrode, along with a pixel defining layer and a bump on the pixel defining layer, where the first electrode is disposed on the sloped sidewall to reflect light, and the bump is designed to redirect emitted light for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat electrode structure is used, then the device structure is simple, but light emission efficiency is low due to lack of light redirection
Solution Approach 1:
The first electrode is designed with a sloped sidewall forming an inclined surface instead of a flat structure. This curved/angled geometry enables light reflected from the organic emission layer to be redirected toward the viewer, improving light emission efficiency while maintaining manufacturing feasibility through standard deposition techniques
Solution Approach 2:
The electrode structure transitions from a two-dimensional flat surface to a three-dimensional inclined structure with a sloped sidewall. This dimensional change creates additional light reflection paths and redirects light in multiple directions, enhancing overall light output without significantly complicating the manufacturing process
2Productivity
If the first electrode reflects light, then light emission efficiency improves, but the pixel defining layer must be precisely positioned to avoid blocking reflected light
Solution Approach 1:
The pixel defining layer is designed to extend over the first electrode in advance, creating a predetermined spatial relationship between the two components. This preliminary positioning arrangement ensures that the pixel defining layer does not block reflected light paths while maintaining precise alignment during the manufacturing process
Solution Approach 2:
The pixel defining layer exhibits different spatial configurations at different locations: it extends over the first electrode in certain regions to prevent light blocking, while defining emissive and non-emissive boundaries in other regions. This localized variation in structure optimizes both light reflection and manufacturing precision
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 enhances light emission efficiency by reflecting and redirecting light emitted by the organic emission layer, resulting in improved light output and display performance.
Implementation Method 1
the first electrode is arranged to reflect light which is emitted by the organic emission layer
Implementation Method 2
holes injected from the hole injecting electrode and electrons injected from the electron injecting electrode are combined in the organic emission layer to generate excitons, and the excitons fall from an excited state to a ground state and generate light
Data Source
Figure 1~2
Figure 3~4A
Figure 4B~4C
AI summary
An organic light-emitting display apparatus includes an insulating layer (210) including a inclined structure (209); a first electrode (221) on the insulating layer; a pixel defining layer (223) on the insulating layer and the first electrode, and defining an emissive region and a non-emissive region; a bump (225) on the pixel defining layer; an organic emission layer (220) on the first electrode; and a second electrode (222) on the organic emission layer.