Wavelength Conversion Layer Layout for Display Color Separation
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Solution Overview
Problem
Existing display devices face challenges in preventing color mixing and improving efficiency, particularly in organic light emitting display devices, due to the complexity of light emission areas and wavelength conversion layers.
Innovation Solution
The display device incorporates a substrate with light emitting areas, a thin-film encapsulation layer, a wavelength conversion layer with banks and patterns, a reflective layer, and a capping layer to enhance light transmission and separation, using organic materials and scatters to prevent color mixing and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wavelength conversion layer is used to improve display quality and color reproduction, then color mixing between adjacent light emitting areas occurs, but this reduces display precision and color purity
Solution Approach 1:
The wavelength conversion layer is segmented into multiple isolated wavelength conversion patterns (first, second, and third wavelength conversion patterns) corresponding to different light emitting areas. Each pattern is separated by banks, preventing lateral light diffusion and color mixing between adjacent patterns while maintaining individual wavelength conversion functionality.
Solution Approach 2:
Banks are introduced as intermediary structures between adjacent wavelength conversion patterns. These banks act as physical barriers that block light propagation laterally, preventing color mixing while allowing each pattern to function independently. The banks serve as mediating elements that maintain optical isolation without interfering with the wavelength conversion process.
2Ease of manufacture
If the wavelength conversion layer structure is simplified, then manufacturing becomes easier, but color mixing prevention capability deteriorates
Solution Approach 1:
The banks and wavelength conversion patterns are integrated into a single unified structure formed by pouring a resin composition. This merging of components into one integrated layer simplifies the manufacturing process compared to separately forming each component, while the inherent geometric separation within the unified structure maintains effective light blocking and color mixing prevention.
3Productivity
If particle concentration in the wavelength conversion layer is increased to improve efficiency, then wavelength conversion efficiency increases, but color mixing and non-radiative recombination increase
Solution Approach 1:
Different regions of the display device have different particle concentrations optimized for their specific functions. The wavelength conversion patterns contain higher particle concentration for efficient wavelength conversion, while the bank regions have lower or zero particle concentration to prevent non-radiative recombination and maintain optical isolation. This spatial variation in local quality allows simultaneous optimization of efficiency and energy loss prevention.
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 solution effectively prevents color mixing and enhances efficiency by optimizing the structure of the wavelength conversion layer, ensuring precise light emission and transmission, thereby improving display quality.
Implementation Method 1
The light emitting layer receives electrons and holes from the two electrodes and recombines the electrons and the holes to generate excitons, and the generated excitons change from an excited state to a ground state, thereby emitting light.
Implementation Method 2
a first wavelength conversion pattern overlapping the second light emitting area, and a second wavelength conversion pattern overlapping the third light emitting area
Implementation Method 3
a reflective layer disposed on a side surface of the bank
Implementation Method 4
the light transmission pattern may include a first base resin and a first scatter, the first wavelength conversion pattern may include a second base resin, a second scatterer, and a first wavelength shifter
Data Source
AI summary
A display device includes a substrate, a light emitting element layer on the substrate, and including a first light emitting area, a second light emitting area, and a third light emitting area, a thin-film encapsulation layer on the light emitting element layer, and a wavelength conversion layer on the thin-film encapsulation layer. The wavelength conversion layer includes a bank on the thin-film encapsulation layer and exposing the first light emitting area, the second light emitting area, and the third light emitting area, a reflective layer on a side surface of the bank, a light transmission pattern overlapping the first light emitting area, a first wavelength conversion pattern overlapping the second light emitting area, and a second wavelength conversion pattern overlapping the third light emitting area, and a capping layer on the bank, the light transmission pattern, the first wavelength conversion pattern, and the second wavelength conversion pattern.