Micro-LED Electrode Passivation Layout for Light Output and Reliability
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Solution Overview
Problem
Micro-LEDs in display devices are prone to structural damage during processing, which reduces the reliability and light output efficiency, necessitating improved protection and electrode design.
Innovation Solution
Incorporating a bank with a groove and a passivation layer covering the electrode, using an inorganic material for the protection film to prevent electrode damage and enhance light reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If various structures are designed to improve light output efficiency of micro-LEDs, then light output efficiency is improved, but the structures are exposed and damaged during processing, reducing reliability
Solution Approach 1:
The patent introduces a passivation layer as an intermediary protective structure between the light-emitting element and the electrode. This passivation layer shields the electrode from damage during processing while allowing the light-emitting element to maintain its improved light output efficiency through exposed reflective portions of the electrode.
Solution Approach 2:
The electrode is segmented into different functional regions: portions covered by the passivation layer for protection and portions exposed for light reflection. This segmentation allows the electrode to simultaneously provide mechanical protection and optical enhancement functions.
2Reliability
If a protection film is used to prevent electrode damage, then reliability is improved, but light reflectance may be reduced
Solution Approach 1:
The electrode surface is divided into protected regions (covered by passivation layer) and exposed regions (without passivation layer). The exposed regions maintain high light reflectance while the covered regions provide protection, resolving the contradiction between protection and reflectance.
Solution Approach 2:
Different portions of the electrode have different qualities: some portions are protected by the passivation layer for reliability, while other portions remain exposed to maintain high reflectance. This local differentiation allows both requirements to be satisfied simultaneously.
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
Enhances the reliability and light output efficiency of display devices by protecting the electrodes, enabling low-power operation and improved light generation.
Implementation Method 1
damage to an electrode located on the lower portion of the light-emitting element may be prevented or reduced by using a protection film made of an inorganic material
Implementation Method 2
the reflectance of light generated by the light-emitting element may be improved by preventing or reducing damage to the electrodes of the display panel
Data Source
AI summary
A display device may include a bank located on a substrate, a first electrode located on the bank and including a groove, a passivation layer located on the bank and including a hole, a pattern layer connected to the first electrode and located in the hole, and a light-emitting element located on the pattern layer. The passivation layer may cover the groove of the first electrode.