Display Device Wavelength Conversion Layer Protection
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Solution Overview
Problem
Display devices face degradation issues due to external moisture and oxygen, as well as light emission from light emitting elements, which affect the wavelength control layers and light emitting elements.
Innovation Solution
The display device incorporates sub-pixels with a bank, wavelength conversion layers, a light transmitting layer, and a color filter layer, where the light transmitting layer covers the wavelength conversion layers and is disposed between them and the light emitting elements, and capping layers are used to protect these components from moisture and oxygen, while also reducing degradation from light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the wavelength conversion layer is disposed close to the light emitting element for efficient light conversion, then the light conversion efficiency is improved, but the wavelength conversion layer degrades faster due to exposure to light and heat from the light emitting element
Solution Approach 1:
A light transmitting layer is introduced as an intermediary between the light emitting element and the wavelength conversion layer. This intermediate layer allows light to pass through for efficient conversion while simultaneously protecting the wavelength conversion layer from direct exposure to intense light and heat, thereby resolving the contradiction between conversion efficiency and durability.
Solution Approach 2:
The structure employs a nested arrangement where the light transmitting layer is positioned within the overall layer structure, specifically between the light emitting element and the wavelength conversion layer. This nested configuration enables the inner layer (light transmitting layer) to serve dual functions of light transmission and protection, allowing the wavelength conversion layer to operate close to the light emitting element without direct degradation.
2Ease of manufacture
If the wavelength control layer is exposed to external environment for manufacturing simplicity, then the manufacturing process is simplified, but the wavelength control layer degrades due to moisture and oxygen penetration
Solution Approach 1:
An encapsulation layer is introduced as a protective shell that covers the wavelength conversion layer and other internal components. This thin film structure provides effective barrier protection against moisture and oxygen penetration, preventing degradation of the wavelength control layer while maintaining a compact and manufacturable device structure.
Solution Approach 2:
The encapsulation layer serves as an intermediary barrier between the internal components (wavelength conversion layer, light emitting element) and the external environment. This intermediate protective layer blocks harmful substances like moisture and oxygen from reaching the sensitive internal components, thereby ensuring their long-term stability without complicating the manufacturing process.
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 configuration effectively prevents degradation of the wavelength conversion layers and light emitting elements by external moisture and oxygen, and minimizes the impact of light emission on the wavelength conversion layers, enhancing the longevity and performance of the display device.
Implementation Method 1
a wavelength control layer including wavelength conversion layers disposed in a region surrounded by the bank
Implementation Method 2
a light transmitting layer disposed in the sub-pixels... A light emitted from the light emitting element disposed in the first sub-pixel may pass through the first wavelength conversion layer and the light transmitting layer
Implementation Method 3
a color filter layer disposed on the wavelength control layer... A light emitted from the light emitting element disposed in the first sub-pixel may pass through the first wavelength conversion layer and the light transmitting layer and may be incident to the first color filter
Data Source
AI summary
A display device comprises sub-pixels, a bank disposed on a substrate and disposed at a boundary between the sub-pixels, a wavelength control layer including wavelength conversion layers disposed in a region surrounded by the bank and a light transmitting layer disposed in the sub-pixels, a color filter layer disposed on the wavelength control layer, and light emitting element layers disposed between the substrate and the wavelength control layer, the light emitting layers including a light emitting element disposed in one of the sub-pixels, and connection electrodes connected to ends of the light emitting element. Each of the wavelength conversion layers contacts at least one of the connection electrodes