Micro LED Optical Layer Structure for Moisture-Resistant Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Moisture penetration into display devices with inorganic light-emitting elements, such as micro LEDs, reduces their reliability.
Innovation Solution
A display device design incorporating a substrate with inorganic light-emitting elements, a first and second optical layer, and a first passivation layer positioned further from the substrate, along with trenches and optical layers to enhance protection and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inorganic light-emitting elements are used in display devices, then lighting speed and luminous efficacy are improved, but reliability deteriorates due to moisture penetration
Solution Approach 1:
The patent divides the protective structure into multiple segments: a first passivation layer directly covering the light-emitting elements, a second passivation layer covering the first optical layer, and trenches filling gaps between elements. This segmented approach provides comprehensive moisture protection while maintaining the high lighting speed and luminous efficacy of inorganic light-emitting elements.
Solution Approach 2:
The patent introduces passivation layers as intermediary protective barriers between the moisture environment and the inorganic light-emitting elements. These passivation layers act as mediators that prevent moisture penetration without affecting the optical performance or lighting characteristics of the underlying light-emitting elements.
2Reliability
If protective layers are added to prevent moisture ingress, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a nested protective structure where the first passivation layer is positioned on the light-emitting elements, the second passivation layer is positioned on the first optical layer, and trenches are formed between the elements. This nested arrangement provides multi-level protection while organizing the complexity in a systematic, space-efficient manner.
Solution Approach 2:
The patent addresses protection not only in the vertical dimension with stacked passivation layers but also in the horizontal dimension by forming trenches between light-emitting elements. This multi-dimensional approach to protection comprehensively addresses moisture ingress pathways while maintaining a compact overall structure.
Data Source
AI summary
A display device may include a substrate, a plurality of inorganic light-emitting elements disposed on the substrate, a first optical layer disposed around the plurality of inorganic light-emitting elements, a second optical layer disposed on the plurality of inorganic light-emitting elements and the first optical layer, and a first passivation layer disposed on the first optical layer such that the first passivation layer is farther from the substrate than the first optical layer.