Perforated Pixel Electrodes for Display Short-Circuit Protection
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Solution Overview
Problem
Display devices face issues with lighting failure due to short circuits and potential heat generation and fire accidents from light emitting element overload, which existing technologies have not adequately addressed.
Innovation Solution
The display device incorporates a design with electrodes having holes and connection patterns with lower melting points to minimize short circuit failures and prevent heat-related accidents by disconnecting overloaded elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous electrode structure is used to ensure electrical connectivity, then electrical conductivity is improved, but short circuit risk increases
Solution Approach 1:
The electrode is divided into multiple separate electrode islands instead of using a continuous structure. Each electrode island corresponds to a specific light emitting element and is electrically isolated from adjacent electrode islands, preventing short circuits while maintaining electrical connectivity to the connected light emitting element.
Solution Approach 2:
The electrode structure transitions from a uniform continuous design to a non-uniform segmented design where each local electrode island is positioned and sized specifically to match the underlying light emitting element, providing localized electrical connectivity only where needed.
2Temperature
If high melting point materials are used for electrodes to ensure thermal stability, then temperature resistance is improved, but heat dissipation capability worsens
Solution Approach 1:
A connection pattern with lower melting point than the electrode material is introduced as an intermediary between the electrode and the light emitting element. This connection pattern facilitates heat dissipation to protect the light emitting element from overheating, while the high melting point electrode maintains overall thermal stability.
Data Source
AI summary
A display device includes a plurality of pixels on a substrate. Each of the pixels includes a first electrode and a second electrode spaced apart from each other on the substrate, and a plurality of light emitting elements, each including a first end portion connected to the first electrode and a second end portion connected to the second electrode. The first electrode includes a plurality of first holes adjacent to the first end portion of each of the light emitting elements.