Inorganic LED Electrode Layout for Pixel Lighting Reliability
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Solution Overview
Problem
Existing display devices face challenges in maintaining lighting reliability of pixels, particularly in high-temperature environments, where inorganic LEDs using inorganic materials as fluorescent materials exhibit higher blue light efficiency but require improved electrode configurations for optimal performance.
Innovation Solution
A display device design featuring specific electrode configurations, including multiple connection electrodes with varying widths and spacings, alternating layers, and aligned light emitting elements to enhance electrical connections and reduce stress on pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic LEDs are used to improve blue light efficiency and durability in high-temperature environments, then lighting reliability is improved, but electrode configuration complexity increases to maintain optimal performance
Solution Approach 1:
The connection electrode is divided into multiple electrode portions (first, second, third, and fourth electrode portions) with different widths and spacings. Each portion is specifically designed to contact different polarity ends of light emitting elements, allowing optimized electrical connection for each segment while managing stress distribution across the pixel structure.
Solution Approach 2:
The electrode configuration employs asymmetric design where the first width between the first and second electrode portions is greater than the second width between the third and fourth electrode portions. This asymmetric spacing optimizes the electrical connection and stress management for different polarity connections, addressing the specific requirements of inorganic LED operation.
2Strength
If multiple connection electrodes with varying widths and spacings are implemented, then stress on pixels is reduced and electrical connections are enhanced, but manufacturing precision requirements increase
Solution Approach 1:
Different portions of the connection electrode have different local properties: the first electrode portion and second electrode portion have a first width optimized for one polarity connection, while the third electrode portion and fourth electrode portion have a second width optimized for the opposite polarity connection. This local differentiation allows each electrode portion to be optimally sized for its specific function, enhancing electrical connection strength while managing stress locally at each connection point.
3Power
If electrode portions are spaced to optimize electrical distribution, then power supply voltage distribution is improved, but device area increases
Solution Approach 1:
The electrode portions are arranged in a spatial configuration where they extend in a first direction and are spaced in a second direction perpendicular to the first direction. This multi-dimensional arrangement allows the electrode structure to efficiently distribute power supply voltage across the pixel array while minimizing the overall area occupied by the electrode infrastructure.
Data Source
AI summary
A display device includes: light emitting elements, each of the light emitting elements including a first end having a first polarity and a second end having a second polarity different from the first polarity; and a first type connection electrode contacting the first ends and/or the second ends of the light emitting elements, wherein a first type connection electrode includes: a middle portion extending in a first direction; a first electrode portion extending from the middle portion toward a first side in a second direction intersecting the first direction; a second electrode portion extending from the middle portion toward the first side in the second direction and spaced from the first electrode portion by a first width in the first direction; a third electrode portion extending from the middle portion toward a second side in the second direction; and a fourth electrode portion.