LED Display Electrode Layout With Barrier Metal for Precise Alignment
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Solution Overview
Problem
Existing display devices face challenges in maintaining precise alignment of light emitting elements, leading to deviations and potential short-circuits due to variations in electrode distances and conductive patterns.
Innovation Solution
The display device incorporates a conductive pattern on a substrate with a passivation layer, featuring first and second shielding electrodes spaced closely, and first and second electrodes with specific distance ratios, along with bank patterns to align light emitting elements accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between electrodes is reduced to improve alignment precision, then alignment precision is improved, but the risk of short-circuit increases
Solution Approach 1:
The patent introduces a barrier metal layer as an intermediary between the first and second electrodes. This barrier layer physically separates the electrodes while maintaining the required electrical connection through the light emitting element, thereby preventing direct contact and short-circuits even when electrodes are positioned closely for improved alignment precision
Solution Approach 2:
The patent divides the electrode structure into multiple segments: the first electrode, the barrier metal layer, and the second electrode. This segmentation allows the electrodes to be positioned closer together for better alignment while the barrier layer acts as a spatial divider that prevents short-circuits by creating distinct electrical zones
2Ease of manufacture
If conventional electrode structures are used, then manufacturing is simpler, but alignment precision deteriorates
Solution Approach 1:
The barrier metal layer is formed in advance during the manufacturing process, before the final electrode positioning. This preliminary action establishes a pre-defined separation structure that guides subsequent electrode placement, ensuring alignment precision is achieved without complicating the overall manufacturing workflow
Data Source
AI summary
A display device may include a conductive pattern disposed on a substrate. A passivation layer may be disposed on the conductive pattern. A first shielding electrode and a second shielding electrode that may be disposed on the passivation layer may be spaced apart from each other. A first electrode may be disposed on the first shielding electrode. A second electrode may be disposed on the second shielding electrode. A light emitting element may be electrically connected between the first electrode and the second electrode. A first distance between the first shielding electrode and the second shielding electrode may be less than a second distance between the first electrode and the second electrode.