Micro-LED Display Device with Stacked Light-Emitting Elements
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Solution Overview
Problem
Current display devices, particularly micro-LED display devices, face challenges in enhancing internal quantum efficiency due to limitations in the design and arrangement of light-emitting elements, which affect the overall performance and efficiency of the display.
Innovation Solution
The proposed solution involves a display device design where a first light-emitting element with a larger width is positioned on a different layer than the second and third light-emitting elements, with a connection electrode layer of the same material as the common electrode layer, allowing for increased area coverage and improved internal quantum efficiency by optimizing the arrangement and structure of light-emitting elements on a circuit substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of light-emitting elements is increased to improve internal quantum efficiency, then the efficiency improves, but the device complexity and fabrication difficulty increase
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration with multiple layers (first layer, second layer, third layer). This vertical stacking allows the first light-emitting element to have a larger area while maintaining compact overall device dimensions, thereby improving internal quantum efficiency without proportionally increasing device complexity.
Solution Approach 2:
The patent implements a nested structure where the first light-emitting element is positioned on the first layer, and the second and third light-emitting elements are positioned on the second layer, with the connection electrode layer interconnecting them. This nested multi-layer arrangement optimizes space utilization and allows larger area elements to be integrated without linearly increasing fabrication complexity.
2Reliability
If the first light-emitting element is positioned on a different layer to increase its area, then internal quantum efficiency improves, but the fabrication process complexity increases
Solution Approach 1:
The patent divides the device into distinct functional layers: a first layer containing the first light-emitting element, a second layer containing the second and third light-emitting elements, and intermediate connection electrode layers. This segmentation allows each layer to be optimized independently for its specific function, facilitating modular fabrication processes that can improve internal quantum efficiency while managing manufacturing complexity through standardized layer-by-layer construction.
3Stability of the object's composition
If the connection electrode layer is used to connect light-emitting elements on different layers, then structural integrity is maintained, but the device complexity increases
Solution Approach 1:
The patent introduces a connection electrode layer as an intermediary component between the first light-emitting element on the first layer and the second light-emitting element on the second layer. This intermediary structure maintains electrical and mechanical connectivity across layers, ensuring structural integrity and stable composition while enabling the multi-layer configuration that improves internal quantum efficiency through optimized light-emitting element areas.
Data Source
AI summary
A display device includes light-emitting elements arranged on a circuit substrate, extending in a thickness direction of the circuit substrate, and including a first light-emitting element configured to emit a first light, and a second light-emitting element configured to emit a second light, and having a width that is less than a width of the first light-emitting element, a common electrode layer above the light-emitting elements, and a connection electrode layer between the first light-emitting element and the common electrode layer.