Micro-LED Display Electrode Layout for Low-Resistance Current Paths
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Solution Overview
Problem
Micro-LED display devices face challenges in achieving high luminance and reducing power consumption due to high wiring resistance between light emitting elements and power lines, which affects image quality and efficiency.
Innovation Solution
The display device incorporates a structure with pixel electrodes and contact electrodes between organic insulating layers and a resin layer, with wiring lines formed of metal and connected to contact electrodes, reducing wiring resistance by exposing cathodes of light emitting elements and allowing the common electrode to be shared across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro-LED display devices use conventional wiring structures, then device complexity is reduced, but wiring resistance increases leading to lower luminance and higher power consumption
Solution Approach 1:
The patent transitions from planar wiring to three-dimensional wiring structures, including vertical vias and multi-layer conductive paths. This dimensional change allows current to flow through multiple layers and pathways, reducing resistance and improving luminance while managing power consumption in high-resolution micro-LED displays.
Solution Approach 2:
The patent implements nested wiring structures where conductive layers are embedded within insulating layers, and multiple wiring layers are stacked vertically. This nesting approach allows compact integration of complex wiring paths within the limited space of the display device, reducing overall resistance without increasing device footprint.
2Reliability
If wiring lines are made longer to connect light emitting elements to power lines, then connectivity is improved, but wiring resistance increases affecting image quality
Solution Approach 1:
The patent divides the wiring system into multiple segments across different conductive layers. Instead of using single long wiring lines, the current path is segmented into multiple shorter segments connected through vertical vias. This segmentation reduces the resistance of each segment while maintaining overall connectivity, thereby preserving image quality.
Solution Approach 2:
The patent introduces intermediate conductive layers and via structures as mediators between the light emitting elements and the power lines. These intermediary structures provide multiple connection points and alternative current paths, reducing the effective resistance and improving both connectivity and image quality.
Data Source
AI summary
According to one embodiment, a display device includes pixels each including transistors, pixel electrodes, a contact electrode, and light emitting elements, and an insulating basement, a first organic insulating layer, a second organic insulating layer, a resin layer, a common electrode, and first wiring lines. The common electrode is electrically connected to cathodes of the light emitting elements, and electrically connected to the contact electrodes of the pixels. The first wiring lines, each provided between the first organic insulating layer and the second organic insulating layer or between the second organic insulating layer and the resin layer, are electrically connected to the contact electrodes of the pixels, and are formed of a metal.