OLED Panel Concave Insulation for Light Extraction
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Solution Overview
Problem
Organic light emitting display panels face issues with low light extraction efficiency due to trapped light, color mixing between adjacent subpixels, and reduced brightness when multiple panels are connected.
Innovation Solution
The design incorporates a structure with a concave portion on the insulation film, a first electrode on the concave portion, and a bank with specific portions to enhance light extraction, prevent color mixing, and maintain high brightness by optimizing the organic layer and electrode positions, along with a light reflecting member on the encapsulation layer to direct light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat structure is used in the organic light emitting display panel, then the manufacturing process is simple, but light extraction efficiency is low due to trapped light
Solution Approach 1:
The patent applies curvature by forming a concave portion in the insulation film with a specific curved profile (including inclined portions and a flat bottom portion). This curved structure modifies light propagation paths through refraction and reflection, enabling trapped light to be extracted effectively while maintaining manufacturing feasibility through standard photolithography and etching processes
Solution Approach 2:
The patent transitions from a two-dimensional flat surface to a three-dimensional concave structure by introducing depth variation in the insulation film. The concave portion creates multiple interfaces at different depths and angles, providing additional light extraction pathways that overcome the limitations of flat surface emission
2Area of stationary object
If the organic layer is extended to cover the entire electrode area, then the light emitting area is maximized, but color mixing occurs between adjacent subpixels
Solution Approach 1:
The patent applies local quality by creating spatially varying structures: the concave portion is positioned specifically in the light emitting area while the bank structure is positioned in the non-emission area. The organic layer is selectively formed only in the light emitting area corresponding to the concave portion, giving different regions distinct functions - the concave region for light emission and the bank region for isolation and color filtering
Solution Approach 2:
The patent segments the electrode area into distinct functional zones: the light emitting area with the concave portion where the organic layer is formed, and the non-emission area surrounded by the bank structure. This segmentation physically separates regions that would otherwise cause color mixing, allowing each subpixel to emit light independently while maintaining sharp color boundaries
3Area of stationary object
If multiple panels are connected to expand display size, then the coverage area is increased, but overall brightness decreases
Solution Approach 1:
The curved concave structure in each panel enhances light extraction efficiency through refraction and reflection at the curved interfaces, increasing the amount of light emitted from each individual panel. This ensures that when multiple panels are connected, each panel maintains high brightness output, preventing the overall brightness degradation that would otherwise occur in large-area multi-panel displays
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 enhances light extraction efficiency, prevents color mixing between subpixels, and maintains high brightness even when multiple panels are connected, improving overall display performance.
Implementation Method 1
at least one structure disposed on the encapsulation layer, overlapping at least one light emitting area, and having at least one side surface where a light reflecting member is disposed
Data Source
AI summary
Embodiments of the disclosure relate to an organic light emitting display panel and an organic light emitting display device including the same, and more specifically, to an organic light emitting display panel and an organic light emitting display device which include: an insulation film with at least one concave portion including a flat portion and an inclined portion surrounding the flat portion in at least one subpixel, a first electrode disposed on the concave portion, an organic layer disposed on the first electrode, a second electrode disposed on the organic layer, an encapsulation layer disposed on the second electrode, and at least one structure disposed on the encapsulation layer, overlapping at least one light emitting area, and having at least a side surface where a light reflecting member is disposed, thereby enhancing light extraction efficiency.