Vertical Micro-LED Electrode Layout for High-Density Display Pixels
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Solution Overview
Problem
Current display devices face challenges in enhancing light output efficiency of subminiature light emitting elements, particularly in terms of reducing space requirements for electrodes and optimizing the arrangement of light emitting diodes to improve luminance and durability under various environmental conditions.
Innovation Solution
A display device design featuring a substrate with a display area and non-display area, including pixels with sub-pixels that incorporate a light emitting element with a core-shell structure, an intermediate layer, and a specific electrode configuration to enhance light emission efficiency, along with a method of manufacturing that involves aligning light emitting elements between electrodes and forming an intermediate layer to expose the elements for improved light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light emitting diodes are reduced to subminiature size for higher pixel density, then display resolution is improved, but light output efficiency and luminance deteriorate
Solution Approach 1:
The light emitting element is transitioned from a planar structure to a three-dimensional vertical structure extending in the thickness direction of the substrate. This vertical orientation allows light to be emitted perpendicular to the substrate surface, effectively utilizing the third dimension to maintain high luminance despite the reduced horizontal footprint of subminiature LEDs.
Solution Approach 2:
The light emitting element is divided into distinct functional segments: a first electrode at the bottom, a light emitting layer in the middle, and a second electrode at the top. This segmentation allows each layer to be optimized independently for its specific function while maintaining compact overall dimensions.
2Measurement precision
If electrode space is reduced to accommodate more pixels, then pixel density is improved, but electrical connection reliability deteriorates
Solution Approach 1:
Electrical connections are extended from the substrate surface into the thickness direction by forming vertical electrode structures. The first electrode is positioned at the bottom of the light emitting element and the second electrode at the top, creating a vertical electrical pathway that reduces the horizontal space required for lateral electrode connections.
3Ease of manufacture
If light emitting elements are arranged horizontally in the substrate plane, then manufacturing is simplified, but light output efficiency and viewing angle deteriorate
Solution Approach 1:
The light emitting element is reoriented from a horizontal in-plane arrangement to a vertical configuration extending through the substrate thickness. This vertical arrangement directs light emission perpendicular to the substrate surface, improving viewing angles and light extraction efficiency while maintaining compatibility with standard manufacturing processes.
Data Source
AI summary
A display device may include: a substrate including a display area and a non-display area; and pixels in the display area, and each including sub-pixels. Each sub-pixel may include a pixel circuit layer, and a display element layer including at least one light emitting element. The display element layer may include: a first electrode on the pixel circuit layer; a second electrode on the first electrode and electrically insulated from the first electrode; the light emitting element including a first end portion coupled to the first electrode and a second end portion coupled to the second electrode, and between the first electrode and the second electrode; an intermediate layer enclosing at least one area of the light emitting element, and on the first electrode; a connection line electrically connected to the second electrode. The second electrode may be on the intermediate layer.