Display Unit Insulating Layers Refractive Indices Light Extraction
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Solution Overview
Problem
Current display units face challenges in reducing power consumption while maintaining high image quality and efficiency, particularly in organic EL display devices where the arrangement of sub-pixels and electrodes affects light emission and extraction.
Innovation Solution
The display unit incorporates a pixel configuration with multiple sub-pixels, each featuring a single first electrode, a second electrode in a lamination direction, and a light-emitting layer, along with a specific arrangement of windows and insulating layers to enhance light extraction and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple electrodes are provided in each sub-pixel to increase light emission area, then luminance is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple electrode functions into a single electrode structure per sub-pixel. Specifically, one electrode serves multiple light emission regions within the same sub-pixel, reducing the total electrode count while maintaining luminance output through optimized light extraction pathways.
Solution Approach 2:
The patent introduces insulating layers with different refractive indices to create optical dimensionality. By stacking insulating layers with varying refractive indices (n1 < n2 < n3), the patent exploits refraction and total internal reflection at layer interfaces to redirect and extract light more efficiently, compensating for the reduced electrode count.
2Illumination intensity
If light extraction efficiency is improved by adding optical structures, then luminance is enhanced, but device complexity increases
Solution Approach 1:
The patent changes optical parameters by selecting insulating layer materials with specific refractive index relationships (n1 < n2 < n3). This parameter-based approach optimizes light extraction through refraction and reflection without adding mechanical or structural complexity, using only material property variations.
Solution Approach 2:
The insulating layers serve dual functions: they provide electrical insulation between electrodes and simultaneously act as optical elements for light extraction enhancement. This multi-functionality avoids additional dedicated optical structures, maintaining device simplicity.
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 improves light extraction efficiency and reduces power consumption by optimizing the arrangement of sub-pixels and electrodes, allowing for lower current density and reduced power usage while maintaining equivalent luminance and image quality.
Implementation Method 1
a first insulating layer 213 having a plurality of windows 213a in correspondence with the light emission regions... a second insulating layer 216 that is formed to cover a whole region of the sub-pixel 11 and that has a refractive index different from a refractive index of the first insulating layer 213
Implementation Method 2
light is reflected on a side surface of the light guiding section
Data Source
AI summary
A display unit includes a pixel including a plurality of sub-pixels. The sub-pixels each include a plurality of light emission regions that are arranged away from one another. Each of the sub-pixels includes a single first electrode, a single second electrode provided in a lamination direction of the first electrode, and a light-emitting layer inserted between the first electrode and the second electrode in each of the light emission regions.