Nano Rod Bank Layer for OLED Black Visual Characteristics
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Solution Overview
Problem
Display devices with transparent bank layers face increased reflectivity issues due to electrode reflections, affecting black visual characteristics and contrast ratios, particularly in organic light-emitting diode (OLED) displays.
Innovation Solution
Incorporating nano rods into the bank layer to absorb the entire visible light wavelength band, improving black visual sense and implementing near-infrared light emission characteristics, while also stabilizing material dispersion and process optimization by reducing solid content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent bank layer is used as a pixel definition film, then the manufacturing process is simplified and material usage is reduced, but the reflectivity of the panel increases due to electrode reflection
Solution Approach 1:
The patent applies composite materials by combining transparent bank layer material with dispersed nano rods (such as titanium dioxide, zinc oxide, or silicon oxide) to create a hybrid structure that maintains transparency while adding light scattering capability to reduce reflectivity
Solution Approach 2:
The patent implements local quality by selectively adding light scattering properties to specific regions of the bank layer through nano rod dispersion, allowing different functional zones within the bank layer to have different optical characteristics - transparent in some areas and light-scattering in others
2Device complexity
If a transparent bank layer is used, then the structure is simplified, but the black visual characteristics and contrast ratio deteriorate due to increased reflectivity
Solution Approach 1:
The patent uses composite materials comprising transparent bank layer material combined with light scattering nano rods to achieve both structural simplicity and improved black visual characteristics through enhanced light scattering that reduces electrode reflection visibility
Solution Approach 2:
The patent applies color changes by utilizing the light scattering properties of nano rods to modify the optical appearance of the bank layer, creating a visual effect that enhances contrast and black characteristics without changing the fundamental transparent structure
3Illumination intensity
If nano rods are introduced into the bank layer, then light absorption across the visible spectrum is improved and black visual characteristics are enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by carefully controlling the size, shape, and concentration parameters of the nano rods within the bank layer to optimize light absorption across the visible spectrum while maintaining manufacturability through standardized production parameters
4Stability of the object's composition
If nano rods are introduced into the bank layer, then material dispersion stability and process efficiency are improved by lowering solid content, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration parameters of nano rods in the bank layer material to achieve lower solid content that improves dispersion stability while reducing manufacturing complexity through simplified formulation parameters
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
The nano rod-infused bank layer effectively absorbs visible light, enhances black visual characteristics, and enables near-infrared light emission, improving material stability and process efficiency in OLED displays.
Implementation Method 1
the bank layer contains a nano rod absorbing light of a visible light region and emitting light of the near-infrared region
Data Source
AI summary
Aspects of the present disclosure relate to a display device and, more particularly, may provide a display device capable of implementing black characteristics by absorbing a whole wavelength band of visible light and improving a black visual sense by including a substrate including a light emission region and a non-light emission region, a light-emitting element disposed on the substrate and including a first electrode, a light-emitting layer, and a second electrode, and a bank layer defining an opening part of the light emission region and containing a nano rod.