OLED First Electrode Protective Pattern for Light Leakage Prevention
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Solution Overview
Problem
Organic light-emitting display devices face issues with current leakage and reduced lifespan due to insufficient bank height and excessive organic layer accumulation, leading to light leakage and electrode degradation during the solution process.
Innovation Solution
An organic light-emitting display device with a first electrode protective pattern that overlaps the bank, formed from materials like oxide semiconductor or metal layers, to prevent light leakage and electrode damage, and a dual-layer bank structure to manage organic layer distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bank height is increased to prevent organic layer accumulation, then light leakage is reduced, but manufacturing complexity increases due to dual bank structure requirements
Solution Approach 1:
A protective pattern is formed on the first electrode before the bank is formed. This preliminary protective layer prevents organic material accumulation at the electrode edges during subsequent processing steps, eliminating the need for increased bank height to prevent accumulation-related light leakage.
Solution Approach 2:
The protective pattern acts as an intermediary layer between the first electrode and the organic light-emitting layer. It prevents direct contact and accumulation of organic materials at the electrode edges, thereby preventing light leakage without requiring structural modifications to the bank.
2Ease of manufacture
If the organic light-emitting layer is formed via solution process to reduce mask processes, then manufacturing ease improves, but organic layer accumulation worsens causing current leakage
Solution Approach 1:
The protective pattern is formed on the first electrode before the solution process. This pre-formed protective layer prevents organic material accumulation at the electrode edges during the solution-based organic layer formation, enabling precise control of organic layer distribution without requiring additional mask processes.
Solution Approach 2:
The protective pattern serves as an intermediary that prevents direct interaction between the solution-process-formed organic layer and the first electrode edges. This intermediary layer ensures precise organic layer distribution while maintaining the manufacturing simplicity of the solution process.
3Reliability
If the bank is formed in dual form to increase height, then light leakage is reduced, but current leakage increases due to organic layer accumulation in stepped areas
Solution Approach 1:
The protective pattern is formed on the first electrode before the dual-structure bank is formed. This preliminary protective layer prevents organic material accumulation in the stepped areas of the dual bank structure, eliminating the source of current leakage while maintaining the light leakage prevention benefits of the dual bank structure.
Solution Approach 2:
The protective pattern acts as an intermediary that prevents organic materials from accumulating in the stepped regions of the dual bank structure. This intermediary layer eliminates current leakage pathways while allowing the dual bank structure to maintain its effectiveness in preventing light leakage.
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 solution effectively reduces light leakage and extends the lifespan of the display device by preventing electrode degradation and optimizing organic layer distribution, even when formed via a solution process.
Implementation Method 1
electrons and holes are respectively injected into the organic light-emitting layer from the two electrodes, and excitons are produced in the organic light-emitting layer via combination of the electrons and holes. Then, when the produced excitons fall down from the excited state to the ground state, light is generated from the organic light-emitting diode.
Data Source
AI summary
An organic light-emitting display device protects a first electrode and reduces any effect due to light leakage from the top or the peripheral side of a bank, thereby increasing lifespan. The organic light-emitting display device includes a first electrode protective pattern.