Display Electrode Mesh Layout for Uniform Luminance
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Solution Overview
Problem
Existing display devices face challenges in maintaining reliability and display quality due to the connection between light-emitting elements and pixel driving circuits, particularly in terms of voltage stability and luminance uniformity.
Innovation Solution
The display device incorporates a mesh structure formed by transmission lines and electrodes that receive power supply voltage, ensuring stable power distribution and reducing voltage drop, thereby improving the lifespan and luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode structure is used, then the device complexity is low, but the voltage stability and luminance uniformity deteriorate
Solution Approach 1:
The first electrode layer is divided into multiple first electrodes that are arranged in a mesh pattern, and the transmission line group is divided into multiple transmission lines extending in different directions. This segmentation allows for more uniform voltage distribution across the light-emitting elements while maintaining a manageable structural complexity through systematic arrangement.
Solution Approach 2:
The patent introduces a mesh structure by adding transmission lines in a crossing direction that is non-parallel to the primary direction of first electrodes. This dimensional addition creates a two-dimensional network of power distribution paths, enabling voltage to reach all regions of the display more uniformly and reducing voltage drop effects.
2Reliability
If the light-emitting element connection is simplified, then the manufacturing process is easier, but the reliability and lifespan deteriorate due to voltage drop
Solution Approach 1:
The connection structure is segmented into multiple first electrodes and multiple transmission lines arranged in a mesh pattern. This segmentation distributes the electrical connection paths, reducing the current load on individual connections and minimizing voltage drop, thereby improving reliability and lifespan without requiring overly complex manufacturing processes.
Solution Approach 2:
The mesh structure provides localized power distribution to each light-emitting element through dedicated first electrodes and transmission lines. This local quality approach ensures that each region receives stable voltage independently, improving overall reliability while maintaining ease of manufacture through modular connection design.
3Illumination intensity
If power supply voltage is distributed through simple lines, then the device complexity is low, but the luminance uniformity deteriorates due to voltage drop
Solution Approach 1:
The transmission line group includes lines extending in a crossing direction that is non-parallel to the first electrodes, creating a two-dimensional mesh structure. This dimensional enhancement provides multiple parallel power distribution paths, ensuring uniform voltage delivery to all light-emitting elements and achieving consistent luminance across the display.
Solution Approach 2:
The power distribution system is segmented into multiple first electrodes and multiple transmission lines forming a mesh. This segmentation creates numerous short transmission paths from power sources to light-emitting elements, minimizing voltage drop and ensuring uniform illumination intensity across the entire display area.
Data Source
AI summary
A display device includes: a pixel driving circuit part including a transistor, a connection electrode located on the pixel driving circuit part and electrically connected to the transistor of the pixel driving circuit part, a first electrode layer located on the connection electrode, the first electrode layer receiving a power supply voltage and including a plurality of first electrodes, a transmission line group located in a different layer from the first electrode layer, electrically connected to the first electrode layer, and forming a mesh structure with the first electrode layer in plan view, a separator located on the first electrode layer, and a second electrode layer located on the first electrode layer and separated into a plurality of second electrodes by the separator.