OLED Display Refractive Index Matching Layer
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Solution Overview
Problem
Organic light-emitting display apparatuses experience reflection issues due to refractive index differences between stacked layers when external light is incident, which affects customer experience by reducing visibility and image definition.
Innovation Solution
Incorporating a color filter with a spacer color filter formed between red, green, and blue color filters, and an intermediate layer with a refractive index between the color filter and the substrate to minimize refractive index differences and enhance light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional color filter structure is used, then the manufacturing process is simple, but surface reflection occurs due to refractive index differences between stacked layers
Solution Approach 1:
An intermediate layer is introduced between the color filter and the encapsulation substrate. This intermediate layer has a refractive index that is intermediate between the color filter and substrate, serving as a refractive index bridge to reduce reflection at the interface.
Solution Approach 2:
The refractive index parameter is optimized by introducing an intermediate layer with specific refractive index properties. This changes the optical parameter profile across the stacked layers to minimize reflection losses.
2Object-affected harmful factors
If light-shielding components are added to reduce reflection, then surface reflection is reduced, but the device structure becomes more complex
Solution Approach 1:
The intermediate layer serves multiple functions: it acts as a refractive index matching layer to reduce reflection, and simultaneously serves as part of the encapsulation structure. This multi-functionality avoids the need for separate light-shielding components.
Solution Approach 2:
The light-shielding function and encapsulation function are merged into a single integrated structure, eliminating the need for separate components and reducing overall device complexity.
3Ease of manufacture
If the refractive index difference between stacked layers is large, then the manufacturing process is simpler, but light absorption is reduced due to increased reflection
Solution Approach 1:
The refractive index parameter is optimized by introducing an intermediate layer with specific refractive index properties. This changes the optical parameter profile across the stacked layers to minimize reflection losses.
Solution Approach 2:
An intermediate layer is introduced between the color filter and the encapsulation substrate. This intermediate layer has a refractive index that is intermediate between the color filter and substrate, serving as a refractive index bridge to reduce reflection at the interface.
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 reduces surface reflection and maximizes light absorption, improving visibility and image definition while simplifying the manufacturing process by eliminating the need for separate light-shielding components.
Implementation Method 1
reflection occurs due to a refractive index difference between stacked layers in the organic-light emitting display apparatus
Implementation Method 2
maximization of the absorption of external light
Data Source
AI summary
An organic light-emitting display apparatus includes: an organic light-emitting device including a plurality of sub-pixels respectively emitting lights of different colors; a color filter formed on the organic light-emitting device in a region corresponding to each of the sub-pixels; a spacer color filter formed in the color filter between red, green, and blue color filters at locations corresponding to non-emitting areas; and a substrate provided on the color filter to encapsulate the organic light-emitting device.