Light Emitting Element Shielding Film Against Electric Field Degradation
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Solution Overview
Problem
Current light emitting elements face challenges in maintaining light emission efficiency and stability due to external electric fields, which can lead to reduced performance over time.
Innovation Solution
Incorporating a shielding layer with high light transmittance and reflectance, made of metal with a thickness of up to 5 nm, that surrounds the light emitting layer and semiconductor layers, effectively shielding external electric fields and enhancing light emission through the element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding layer is added to block external electric fields, then reliability and stability are improved, but device complexity increases
Solution Approach 1:
The shielding layer is nested within the insulating film, creating a layered protective structure where the shielding layer is disposed inside the insulating film that covers the semiconductor layers and light emitting layer. This nested configuration provides electric field shielding while maintaining a compact device structure without adding external complexity.
Solution Approach 2:
The shielding layer acts as an intermediary element between the light emitting layer and external electric fields. By positioning the shielding layer within the insulating film, it mediates the interaction between the sensitive light emitting components and external electric fields, protecting against degradation while maintaining light transmission.
2Reliability
If a metal shielding layer is used to block electric fields, then reliability is improved, but light transmittance may be reduced
Solution Approach 1:
The shielding layer is implemented as an extremely thin metal film with thickness of 1 nm or less, which is sufficiently thin to allow light transmission while maintaining its electric field shielding capability. This thin film approach provides the necessary protection without significantly blocking the light emitted by the light emitting layer.
Solution Approach 2:
The thickness parameter of the shielding layer is precisely controlled to be 1 nm or less, which optimizes the balance between electric field shielding effectiveness and light transmission. By adjusting this critical parameter, the shielding layer provides protection while maintaining high light transmittance for sustained light emission.
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 shielding layer improves light emission efficiency and stability by preventing electric field-induced degradation, ensuring consistent performance and extending the lifespan of the light emitting element.
Implementation Method 1
a light reflectance of the shielding layer may be equal to or greater than about 90%, and light emitted from the light emitting layer may be reflected by the shielding layer and may transmit outside the light emitting element through the first semiconductor layer and the electrode layer
Implementation Method 2
A light transmittance of the shielding layer may be equal to or greater than about 70%, and light emitted from the light emitting layer may transmit through the shielding layer
Data Source
AI summary
A display device includes a light emitting element disposed on a substrate and including a first end portion and a second end portion. The first electrode is electrically connected to the first end portion of the light emitting element. The second electrode is electrically connected to the second end portion of the light emitting element. A first semiconductor layer, a light emitting layer, a second semiconductor layer, and an electrode layer of the light emitting element are sequentially disposed along a longitudinal direction from the second end portion to the first end portion. An insulating film of the light emitting element covers side surfaces of the first semiconductor layer, the light emitting layer, the second semiconductor layer, and the electrode layer, and extends in parallel to the longitudinal direction. A shielding layer is disposed inside the insulating film.