Inorganic LED Display Trench Structure for Moisture Reliability
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Solution Overview
Problem
Display apparatuses using inorganic light emitting diodes (LEDs) are prone to reliability issues due to moisture penetration from the outside.
Innovation Solution
The display apparatus includes a substrate with a display area and non-display area, featuring inorganic light emitting diodes, an optical layer, a first passivation layer, and trenches between the diodes to enhance protection and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic light emitting diodes are used in display apparatus, then luminous efficiency and brightness are improved, but reliability deteriorates due to moisture penetration
Solution Approach 1:
The patent divides the protective structure into multiple segments: encapsulation layers surrounding each individual light emitting diode, and a matrix of trenches separating adjacent diodes. This segmented approach creates multiple barriers against moisture penetration, addressing the reliability issue while preserving the high luminous efficiency of inorganic LEDs
Solution Approach 2:
The patent applies different protective measures to different locations: encapsulation layers provide localized protection around each LED, while trenches create localized barriers in the spaces between diodes. This local quality differentiation allows targeted moisture prevention without compromising the overall luminous performance
2Reliability
If protective structures are added to prevent moisture penetration, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple protective functions into a unified structure: the encapsulation layers and trenches work together as an integrated moisture barrier system. The trenches serve dual purposes by both separating diodes and providing moisture protection, thereby reducing overall structural complexity while maintaining high reliability
Data Source
AI summary
A display apparatus according to an embodiment of the present specification may include a substrate including a display area including a plurality of pixels and a non-display area disposed around the display area, one or more pixel driving circuits disposed on the substrate, a plurality of inorganic light emitting diodes connected to the one or more pixel driving circuits, an optical layer disposed around the plurality of inorganic light emitting diodes, a first passivation layer disposed on the optical layer, and a trench disposed between the plurality of inorganic light emitting diodes.