Multi-Bank Encapsulation Structure for Display Device Moisture Blocking
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Solution Overview
Problem
Existing display devices face challenges in improving the reliability of light emitting elements due to moisture penetration, which can degrade the performance and lifespan of these devices.
Innovation Solution
The proposed display device incorporates a multi-bank structure with specific thickness and material combinations for the banks and inorganic layers, which effectively blocks moisture penetration paths and enhances the encapsulation effect, thereby improving the reliability of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-bank structure with specific thickness and material combinations is used, then moisture blocking capability is improved, but device complexity increases
Solution Approach 1:
The encapsulation structure is divided into multiple banks (first bank, second bank, third bank, fourth bank) with different materials and thicknesses. Each bank segment performs a specific function in blocking moisture penetration paths, creating a multi-layered defense system that improves reliability while managing complexity through functional segmentation
Solution Approach 2:
The patent employs composite material construction with banks made of different materials (organic materials, inorganic materials, metal materials) with specific thickness combinations. This composite approach creates synergistic moisture blocking effects that enhance reliability without requiring excessive complexity in any single component
2Reliability
If a multi-bank structure is implemented, then encapsulation effect is enhanced, but manufacturing complexity increases
Solution Approach 1:
The multi-bank structure is designed and prepared in advance with predetermined thickness ratios and material compositions. The first bank has greater thickness than the sum of subsequent banks, and specific banks have greater thickness than others, creating a pre-optimized encapsulation system that simplifies the actual manufacturing process by reducing the need for complex real-time adjustments
Solution Approach 2:
The banks are arranged in a nested configuration where the second bank is disposed on the first bank, the third bank on the second bank, and the fourth bank on the third bank. This nested structure allows for systematic manufacturing where each layer is built upon the previous one, enhancing encapsulation effect while managing manufacturing complexity through a structured, step-by-step process
Data Source
AI summary
A display device comprises a first pixel electrode disposed on a substrate in a first emission area, an insulating layer covering edges of the first pixel electrode, a first light emitting layer disposed on the first pixel electrode and the insulating layer, a first common electrode disposed on the first light emitting layer, a conductive layer disposed on the insulating layer to surround the first emission area and contact the first common electrode, a first bank disposed on the conductive layer, a second bank disposed on the first bank and including tips protruding from side surfaces of the first bank toward the first emission area, and a third bank disposed on the second bank and including an inorganic material.