Concave Pattern and Reflective Portion for OLED Light Extraction
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Solution Overview
Problem
Organic light emitting display apparatuses face reduced light extraction efficiency due to total reflection at interfaces between the light emitting element layer and electrodes or the substrate and air layer, particularly in non-light emission areas and corner portions of light emission areas.
Innovation Solution
A display apparatus with a substrate featuring concave pattern portions and reflective portions around non-light emission areas adjacent to light emission areas, which redirects light emitted towards the light emission areas to enhance extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting element layer is used to display image, then high response speed and low power consumption are achieved, but light extraction efficiency is reduced due to total reflection at interfaces
Solution Approach 1:
The patent introduces a third dimension by forming concave portions in the light emitting element layer, transforming the flat two-dimensional light emission surface into a three-dimensional structure with varying depths. This dimensional change creates multiple light extraction paths and angles, effectively reducing total reflection losses while maintaining the low power consumption advantage of OLED technology
Solution Approach 2:
The concave portions formed in the light emitting element layer create curved surfaces that alter light propagation paths. The curved geometry of the concave portions helps to redirect trapped light modes into extractable paths, improving light extraction efficiency without requiring additional energy input
2Ease of manufacture
If conventional flat structure is used, then manufacturing is simple, but light extraction efficiency is reduced in non-light emission areas and corner portions
Solution Approach 1:
The light emitting element layer is segmented into multiple regions with different depths - light emission areas, non-light emission areas, and corner portions - each with specifically designed concave structures. This segmentation allows optimized light extraction in each region while maintaining overall manufacturing feasibility through a systematic patterning approach
Solution Approach 2:
Different concave structures are applied to different locations: light emission areas have concave portions optimized for light extraction, non-light emission areas have concave portions to redirect stray light, and corner portions have specialized structures. This local quality approach ensures optimal performance in each region while using a unified manufacturing process
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
Improves light extraction efficiency by redirecting light from non-light emission areas and corner portions, maintaining or exceeding light emission efficiency with reduced power consumption and extending the lifespan of the light emitting element layer.
Implementation Method 1
a reflective portion on the pattern portion
Implementation Method 2
pattern portion disposed on the substrate and formed to be concave between the plurality of subpixels
Data Source
AI summary
A display apparatus is provided, which may improve light extraction efficiency of light emitted from a light emitting element layer. The display apparatus comprises a substrate having a plurality of pixels having a plurality of subpixels, a pattern portion disposed on the substrate and formed to be concave between the plurality of subpixels, and a reflective portion on the pattern portion, wherein the plurality of subpixels include a light emission area and a non-light emission area adjacent to the light emission area, and the pattern portion is disposed in the periphery of the non-light emission area.