Flip-Chip LED With Offset Bumps and Central Electrodes
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Solution Overview
Problem
Conventional light emitting elements, such as flip-chip type LEDs, face issues with bond failure and void formation during mounting due to uneven bump heights and inefficient current distribution, leading to reduced luminous efficiency.
Innovation Solution
A light emitting element design where the n-side bump is formed with a higher top level than the p-side bump, and intermediate electrodes are strategically placed to ensure uniform current feeding to the spreading electrode, enhancing bonding reliability and luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple intermediate electrodes are used to feed current to the spreading electrode, then current distribution may be improved, but the complexity of the electrode structure increases
Solution Approach 1:
The patent extracts the current distribution function from a complex multi-electrode system and concentrates it into a single intermediate electrode positioned at the center of the spreading electrode. This simplification maintains effective current feeding while reducing structural complexity compared to using multiple intermediate electrodes distributed across the spreading electrode surface.
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode formed on a same side as the first electrode and including an area less than the first electrode, a first bump formed on the first electrode, and a second bump formed on the second electrode and including a level at a top thereof higher than that of the first bump. A flip-chip type light emitting element includes a spreading electrode, the spreading electrode including an extended part, and plural intermediate electrodes formed on the spreading electrode and arranged in a longitudinal direction of the extended part and centrally in a width direction of the extended part. The intermediate electrodes are disposed such that a distance of half a pitch thereof in the longitudinal direction is equal to or shorter than a distance from one of the intermediate electrodes to an edge of the extended part.