Buffer Layer for Electroluminescence Display Device
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Solution Overview
Problem
Electroluminescence display apparatuses are prone to defects due to foreign materials present during the bonding process, which can cause damage and malfunction due to pressing forces.
Innovation Solution
Incorporating a buffer layer with a lower elastic modulus than the encapsulation layer on the inner surface of the second substrate to absorb pressing forces and prevent damage, while maintaining light transmission and avoiding light leakage and brightness degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer layer with lower elastic modulus is added on the inner surface of the second substrate, then the risk of element damage from foreign materials is reduced, but the device structure becomes more complex
Solution Approach 1:
A buffer layer with lower elastic modulus than the encapsulation layer is formed on the inner surface of the second substrate before bonding. This buffer layer acts as a cushion that absorbs pressing forces from foreign materials during the bonding process, preventing damage to the light emitting layer and other elements. The buffer layer is positioned in advance to provide protective cushioning when foreign materials are present.
2Reliability
If the buffer layer is made with lower elastic modulus to absorb pressing forces, then element damage is prevented, but light transmission may be affected
Solution Approach 1:
The buffer layer is formed with specific local properties: it has a lower elastic modulus than the encapsulation layer to provide cushioning, but its thickness and material composition are carefully controlled to maintain light transmission. The buffer layer's optical properties are optimized locally to balance mechanical protection and optical performance.
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 buffer layer effectively reduces the risk of element damage from foreign materials, preventing defects and ensuring the integrity and performance of the electroluminescence display apparatus.
Implementation Method 1
an elastic modulus of the buffer layer is smaller than an elastic modulus of the encapsulation layer
Data Source
AI summary
An electroluminescence display apparatus includes a first substrate; a second substrate facing the first substrate; a light emitting layer on the first substrate between the first and second substrates; an encapsulation layer on the light emitting layer; a buffer layer on an inner surface of the second substrate facing the first substrate; and a color filter layer including a first color filter and a second color filter on the buffer layer.