Wavelength-Selective Display Laminate With Organic Gas Barrier
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Solution Overview
Problem
Existing display devices, particularly OLED display devices, face challenges in maintaining high light resistance and productivity while effectively reducing internal and external reflections, especially in bright environments, due to the use of wavelength selective absorption filters and gas barrier layers that are either ineffective or costly and complex to produce.
Innovation Solution
A laminate structure incorporating a wavelength selective absorption layer with specific dyes and a gas barrier layer containing a crystalline resin, which provides excellent light resistance and productivity by suppressing dye degradation and oxygen permeation, and includes a quantum dot wavelength conversion material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a wavelength selective absorption filter is used to reduce internal reflection, then the antireflection effect is improved, but the light resistance deteriorates due to dye degradation
Solution Approach 1:
An encapsulation layer is introduced as an intermediary between the wavelength selective absorption filter and the external environment. This encapsulation layer protects the dye molecules from oxygen and moisture, preventing photo-oxidation and degradation while allowing the filter to maintain its antireflection function. The encapsulation acts as a barrier that mediates between the light-sensitive dye and the degrading environmental factors.
Solution Approach 2:
The patent creates an inert protective environment around the dye molecules through the encapsulation layer, which prevents contact with oxygen and moisture. This inert environment shields the wavelength selective absorption filter from oxidative degradation during operation, thereby maintaining both the antireflection effect and light resistance over extended periods.
2Reliability
If inorganic gas barrier layers are used to prevent oxygen permeation, then the light resistance is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the material parameter of the gas barrier layer from inorganic materials (such as silicon oxide or silicon nitride requiring CVD or sputtering) to organic materials with specific molecular structures. By selecting organic compounds with low oxygen permeability and appropriate glass transition temperatures, the patent achieves comparable gas barrier performance while enabling simpler solution-based processing methods.
Solution Approach 2:
The patent replaces mechanical/physical vapor deposition methods (CVD, sputtering) with chemical solution-based processing. The organic gas barrier layer can be deposited through coating, spin-coating, or printing methods, eliminating the need for complex vacuum equipment and high-energy processing, thereby reducing manufacturing complexity while maintaining protective function.
3Manufacturing precision
If the display resolution is increased to 4K and 8K, then the image quality is improved, but the internal reflection increases due to more metal parts
Solution Approach 1:
The patent segments the solution into two functional layers: a wavelength selective absorption filter layer that targets specific reflection wavelengths, and an encapsulation layer that provides physical protection. This segmentation allows each layer to optimize its specific function - the filter layer addresses the increasing internal reflection from high-resolution metal interconnects, while the encapsulation layer protects against degradation.
Solution Approach 2:
The patent employs a composite structure combining the wavelength selective absorption filter (containing dye molecules in a polymer matrix) with an encapsulation layer. This composite material system simultaneously provides optical filtering functionality and protective barrier functionality, effectively managing the internal reflection challenge introduced by high-resolution displays while maintaining long-term stability.
4Object-affected harmful factors
If conventional antireflection films are used, then the external reflection is reduced, but the productivity decreases due to complex multi-layer structures
Solution Approach 1:
The patent merges multiple functions into a single integrated laminate structure. The wavelength selective absorption filter and the encapsulation layer are combined in one laminate unit that can be applied as a single assembly to the display panel. This merging eliminates the need for separate processing steps for applying different antireflection and protective layers, thereby improving manufacturing efficiency while maintaining effective reflection reduction.
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 laminate structure effectively suppresses external light reflection and brightness decrease, maintains the original image tint, and enhances productivity by using an organic material for the gas barrier layer, suitable for OLED display devices.
Implementation Method 1
a wavelength selective absorption layer containing a resin, a dye, and an antifading agent for the dye
Implementation Method 2
a gas barrier layer directly arranged on at least one surface of this wavelength selective absorption layer, in which the gas barrier layer contains a crystalline resin, a thickness of this gas barrier layer is 0.1 μm to 10 μm, and an oxygen permeability of this gas barrier layer is 60 cc/m2·day·atm or less
Implementation Method 3
JP2012-169271A discloses a method of arranging a layer containing quantum dots between a blue light emitting diode (LED) and a light guide plate and then converting the light of the blue LED into red light and green light
Data Source
AI summary
A display device including a laminate includes a wavelength selective absorption layer containing a resin, a dye including at least one of four specific dyes A to D, and an antifading agent for a dye, and includes a gas barrier layer, and a wavelength conversion material; the laminate includes a wavelength selective absorption layer containing a resin, a dye, and an electron migration-type antifading agent in which the energy level of the highest occupied molecular orbital and the lowest unoccupied molecular orbital satisfy a specific relational expression in relation to the dye, and includes the gas barrier layer; an organic electroluminescent display device includes this laminate. The gas barrier layer contains a crystalline resin, has a layer thickness of 0.1 μm to 10 μm, has a layer oxygen permeability of 60 cc/m2·day·atm or less, and is directly arranged on at least one surface of the wavelength selective absorption layer.