Wavelength Conversion Display Structure With Protective Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The wavelength conversion layer in display devices is prone to damage due to heat emission from light emitting elements, leading to reduced efficiency and durability.
Innovation Solution
Incorporating a protective film between the light emitting element and the wavelength conversion layer, which includes a scatterer to scatter light and increase path length, and a selective transmission film to enhance light conversion efficiency, while using a simplified fabrication process for the bank and light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wavelength conversion layer is disposed directly on the light emitting element, then the device structure is simplified, but the wavelength conversion layer is damaged due to heat emission from the light emitting element
Solution Approach 1:
A protective film is introduced as an intermediary layer between the light emitting element and the wavelength conversion layer. This protective film includes a scatterer that scatters light emitted from the light emitting element, increasing the light path length through the wavelength conversion layer while physically separating the two components to prevent heat damage. The protective film thus serves as a mediator that enables both direct contact for structural simplicity and thermal isolation for component protection.
2Productivity
If the protective film includes a scatterer to increase light path length, then light conversion efficiency is enhanced, but the device structure becomes more complex
Solution Approach 1:
The protective film incorporates a scatterer with specific local properties (particle size of 1 nm to 100 nm) that creates light scattering functionality only where needed. This localized scattering effect increases the light path length through the wavelength conversion layer without requiring complex overall device structure changes. The scatterer provides the necessary light management function within the protective film's local region.
3Ease of manufacture
If the bank and light emitting elements use the same simplified fabrication process, then manufacturing is easier, but the fabrication process precision may be reduced
Solution Approach 1:
The bank and light emitting elements are formed through a merged fabrication process where both structures are created simultaneously or in sequence using the same manufacturing steps. This combining of fabrication processes for different components simplifies the overall manufacturing procedure while maintaining adequate precision for both the bank structure and light emitting element formation through unified process control.
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 protective film prevents damage to the wavelength conversion layer, enhances light conversion efficiency, and simplifies the fabrication process.
Implementation Method 1
The protective film may include a scatterer having a diameter in a range of about 1 nanometer to about 100 nanometers
Implementation Method 2
a wavelength conversion layer disposed on the light emitting element in the light emitting area and converting a wavelength of light emitted from the light emitting element
Data Source
AI summary
A display device includes a bank disposed on a substrate, a light emitting element disposed in a light emitting area partitioned by the bank on the substrate, and extended in a thickness direction of the substrate, a wavelength conversion layer disposed on the light emitting element in the light emitting area and converting a wavelength of light emitted from the light emitting element, and a protective film disposed between the light emitting element and the wavelength conversion layer in the light emitting area. The protective film is disposed between at least one side of the light emitting element and at least one side of the bank which face each other.