Stacked Light Emitting Structure for Better Light Extraction
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Solution Overview
Problem
Current light emitting devices face challenges in improving light efficiency and light extraction, particularly in micro LED displays where the stacking of light emitting parts and the need for efficient electrical coupling and light management are critical for enhanced performance.
Innovation Solution
The design includes a light emitting device with multiple stacked light emitting parts, a passivation layer, via patterns, extended patterns, and a pad system for electrical coupling, along with a light shielding layer and transparent adhesion parts to optimize light extraction and efficiency, featuring semiconductor layers and conductive patterns for improved electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light emitting parts are stacked to increase display capability, then the display functionality is improved, but light extraction efficiency deteriorates due to light absorption and reflection between adjacent devices
Solution Approach 1:
A passivation layer is introduced as an intermediary between adjacent light emitting parts. This layer acts as a mediator that prevents harmful light absorption and reflection between neighboring devices, thereby maintaining high light extraction efficiency while enabling stacked configurations for enhanced display functionality.
Solution Approach 2:
The harmful light absorption and reflection effects between adjacent light emitting parts are extracted and isolated by introducing a dedicated passivation layer. This separates the useful light emission function from the harmful inter-device light interaction, allowing the stacked structure to maintain high light extraction efficiency.
2Reliability
If via patterns are formed through light emitting parts to achieve electrical coupling, then electrical connectivity is improved, but the structural integrity and light emission quality may deteriorate
Solution Approach 1:
The passivation layer is selectively applied in specific regions - present between adjacent light emitting parts to prevent light absorption, but removed or absent in via regions to allow electrical coupling. This local differentiation enables simultaneous achievement of reliable electrical connectivity and high light emission quality without mutual interference.
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
This configuration enhances light extraction efficiency, increases contrast, and improves color reproducibility by effectively managing light emission and reflection between adjacent light emitting devices, leading to improved display performance.
Implementation Method 1
Light emitting diodes, as inorganic light sources, are being diversely used in various fields
Implementation Method 2
improving light efficiency and light extraction... a passivation layer surrounding outer sidewalls of the first, second, and third light emitting parts
Implementation Method 3
a via pattern electrically coupled with at least one of the first, second, and third light emitting parts
Data Source
AI summary
A light emitting device including a substrate having a first region and a second region, a light emitting stack including vertically stacked semiconductor layers disposed on the first region of the substrate, at least one pillar disposed on the second region of the substrate and laterally spaced apart from the light emitting stack, and at least one electrode extending from the first region to the second region of the substrate and electrically connecting the light emitting stack to the at least one pillar, in which the at least one pillar is disposed on the at least one electrode, respectively.