Organic EL Light-Emitting Apparatus Viewing Angle Chromaticity
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Solution Overview
Problem
Existing light-emitting apparatuses with top emission methods face challenges in achieving both effective power supply performance and maintaining a favorable viewing angle characteristic for chromaticity, especially as the size increases.
Innovation Solution
The light-emitting apparatus incorporates a plurality of organic electroluminescent sections with a specific laminate structure including different types of transparent material layers between the organic electroluminescent sections and the light extraction surface, featuring a reflective layer configuration that includes a first metal layer, a transparent layer, and a thinner second metal layer, forming an interference structure to optimize light extraction and reduce viewing angle dependence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a thick first metal layer is used in the second reflective layer, then power supply performance is improved, but viewing angle characteristic for chromaticity deteriorates
Solution Approach 1:
The second reflective layer is segmented into multiple functional sub-layers: a thick first metal layer (50-150 nm) for power supply performance, a transparent intermediate layer (50-200 nm) for optical control, and a thin second metal layer (5-50 nm) for chromaticity maintenance. This segmentation allows each sub-layer to optimize its specific function without compromising overall performance.
Solution Approach 2:
The second reflective layer uses a composite structure combining metal layers with different optical and electrical properties. The thick first metal layer provides high electrical conductivity for power supply, while the transparent intermediate layer and thin second metal layer create an interference structure that maintains chromaticity across viewing angles. This composite approach resolves the contradiction between electrical performance and optical performance.
2Area of stationary object
If the size of the light-emitting apparatus is increased, then power supply performance is improved, but viewing angle characteristic for chromaticity deteriorates
Solution Approach 1:
The patent applies local quality by creating a specialized laminate section with specific optical properties at critical locations between the organic electroluminescent section and the light extraction surface. This laminate section, positioned locally where light extraction occurs, contains the interference structure that maintains chromaticity across viewing angles, allowing the overall device size to increase without compromising viewing angle characteristics.
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 effectively reduces the deterioration of the viewing angle characteristic for chromaticity, allowing for both improved power supply performance and chromaticity performance even with thicker metal layers, enhancing light distribution and display quality.
Implementation Method 1
an interference structure is formed according to a structure that includes a reflection interface A on the organic light-emitting layer side of the first reflective layer, a reflection interface B on the organic light-emitting layer side of the first metal layer, a reflection interface C on the light extraction surface side of the first metal layer, a reflection interface D on the organic light-emitting layer side of the second metal layer, and one or more reflection interfaces E formed according to differences in refractive indexes within the laminate section
Data Source
AI summary
A light-emitting apparatus includes a plurality of organic electroluminescent sections, a light extraction surface, and a laminate section. The second reflective layer includes, from the organic light-emitting layer side, a first metal layer, a transparent layer, and a second metal layer thinner than the first metal layer, in this order, and, in each of the organic electroluminescent sections, an interference structure is formed according to a structure that includes a reflection interface A on the organic light-emitting layer side of the first reflective layer, a reflection interface B on the organic light-emitting layer side of the first metal layer, a reflection interface C on the light extraction surface side of the first metal layer, a reflection interface D on the organic light-emitting layer side of the second metal layer, and one or more reflection interfaces E formed according to differences in refractive indexes within the laminate section.