OLED Color Filter Over-Coat Layer with Diffusion Beads
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Solution Overview
Problem
The existing organic light-emitting display devices with micro-lens structures suffer from luminance variations and image quality degradation due to depth deviations in the concavo-convex shape formed by the photo-lithography process, which affects the luminous efficiency and image quality.
Innovation Solution
The use of an organic light-emitting display device with a color filter on a lower substrate, featuring an over-coat layer with diffusion-beads of different refractive indices and shapes, positioned between the light-emitting structure and the color filter, which amplifies light emission without the need for a micro-lens structure, thereby eliminating the photo-lithography process and its associated depth deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a micro-lens structure with concavo-convex shape is formed by photo-lithography process, then luminous efficiency is increased, but depth deviation causes luminance variation and image quality degradation
Solution Approach 1:
The patent removes the problematic photo-lithography process step entirely and replaces it with a self-assembling micro-lens structure formation method using liquid crystal materials, eliminating the source of depth deviation while maintaining the light-focusing function
Solution Approach 2:
The patent replaces the mechanical photo-lithography process with a material-based self-assembly approach using liquid crystal's phase transition properties, where the micro-lens structure forms automatically through material behavior rather than mechanical patterning
2Use of energy by moving object
If a micro-lens structure is formed to increase luminous efficiency, then light extraction is improved, but the concavo-convex shape causes image quality degradation
Solution Approach 1:
The patent extracts and removes the concavo-convex shape formation step that causes image quality issues, replacing it with a planar micro-lens structure that maintains light extraction efficiency without creating luminance variation
Solution Approach 2:
The patent uses liquid crystal material to create a uniform micro-lens pattern that copies the desired optical function without the defects of photo-lithography, achieving consistent lens formation across the entire display area
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 enhances luminous efficiency and maintains image quality by diffusing light effectively, preventing light trapping and increasing the size of the light-emitting region, while avoiding the formation of concavo-convex shapes that cause luminance variations.
Implementation Method 1
First diffusion-beads are dispersed in the over-coat layer. The first diffusion-beads may have refractive index different from the over-coat layer.
Implementation Method 2
The first diffusion-beads may have refractive index different from the over-coat layer.
Data Source
AI summary
An organic light-emitting display device includes a color filter disposed on a light-emitting structure. An over-coat layer may be disposed between the color filter and the light-emitting structure. Diffusion-beads are dispersed in the over-coat layer. Thus, in the organic light-emitting display device according to the aspect of the present disclosure, light efficiency may be increased without a process of forming micro-lens.