OLED Anode Layout to Reduce Reflective Color Bands
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Solution Overview
Problem
Display devices, particularly organic light emitting displays, suffer from reflective color bands due to asymmetric reflection of external light, which degrade display quality.
Innovation Solution
The light emitting display device employs a structured arrangement of conductive patterns and a pixel defining layer to evenly flatten the anode, preventing asymmetric light reflection by maintaining consistent gaps between conductive layers and using a pixel defining layer to separate light emitting layers, thereby reducing reflective color bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional display device structures are used, then manufacturing is simpler, but reflective color bands occur due to asymmetric light reflection
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the conductive pattern arrangement to be asymmetric relative to the pixel opening. Specifically, the first conductive pattern is positioned closer to the pixel opening than the second conductive pattern, creating an asymmetric gap distribution that compensates for the asymmetric light reflection and eliminates reflective color bands.
Solution Approach 2:
The patent implements local quality by creating different gap distances between conductive patterns at different locations. The gap between the first conductive pattern and the pixel opening is intentionally made smaller than the gap between the second conductive pattern and the pixel opening, providing location-specific optical compensation to reduce reflective color bands in critical areas.
2Object-affected harmful factors
If conductive patterns are arranged asymmetrically to reduce reflective color bands, then display quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the conductive patterns into multiple distinct layers (first conductive pattern, second conductive pattern, third conductive pattern) with different positioning requirements. Each segment serves a specific function in the optical compensation system, allowing for modular design and simplified manufacturing control of each individual pattern while achieving the overall asymmetric arrangement.
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 structure improves display quality by minimizing color separation and reflective color bands, ensuring even light reflection and enhanced visual clarity.
Implementation Method 1
reflective color bands generated while being asymmetrically reflected due to reflection of external light
Data Source
AI summary
A light emitting display device includes: a substrate; a first, a second, and a third conductive pattern on the substrate and extending in a first direction; an organic film covering the first, the second, and the third conductive pattern; an anode on the organic film; and a pixel defining layer having an opening overlapping the anode. The opening of the pixel defining layer overlaps the first, the second, and the third conductive pattern in a plan view. The first, the second, and the third conductive pattern are sequentially positioned in a second direction perpendicular to the first direction. In a portion overlapping the opening of the pixel defining layer in a plan view, a gap between the first conductive pattern and the second conductive pattern in the second direction and a gap between the second conductive pattern and the third conductive pattern in the second direction are the same.