Surface Light-Emitting Element Structure to Suppress Bump Protrusion
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Solution Overview
Problem
Existing surface emitting elements face issues with bump protrusion to the side of the light emitting element constituent portion when the electrode on the dummy element constituent portion is connected to the substrate, leading to potential erosion of the light emitting element.
Innovation Solution
A surface emitting element design featuring a convex portion on the dummy element constituent portion that protrudes beyond the external connection surface, with a wiring covering this portion and a protective film, and electrodes having the same height on opposite sides, to prevent bump protrusion and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrode on the dummy element constituent portion is connected to the substrate via a bump, then electrical connection is established, but the bump protrudes to the side of the light emitting element constituent portion causing erosion
Solution Approach 1:
A convex portion is introduced as an intermediary structure between the electrode and the light emitting element constituent portion. This convex portion acts as a physical barrier or stopper that prevents the bump from protruding laterally toward the light emitting element, thereby eliminating the harmful effect while maintaining the electrical connection function through the electrode-bump-substrate pathway.
2Object-affected harmful factors
If the convex portion is added to the dummy element constituent portion, then bump protrusion is suppressed, but device complexity increases
Solution Approach 1:
The convex portion is added only to the dummy element constituent portion where the electrode is provided, not to the entire device or the light emitting element constituent portion. This localized modification achieves the specific function of preventing bump protrusion in the critical area while minimizing the increase in overall device complexity.
Data Source
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AI summary
A surface emitting element capable of suppressing protrusion of a bump to a side of a light emitting element constituent portion when an electrode provided on a dummy element constituent portion is connected to a substrate via the bump is provided. The surface emitting element according to the present technology includes: a base portion including a substrate; and a light emitting element constituent portion and a dummy element constituent portion provided to be spaced apart in an in-plane direction on one surface of the base portion, in which an electrode including an external connection surface is provided on the dummy element constituent portion, and a convex portion protruding to a side opposite to a side of the base portion more than the external connection surface is provided in a proximity portion relatively close to the light emitting element constituent portion, of the dummy element constituent portion. According to the surface emitting element according to the present technology, it is possible to provide the surface emitting element capable of suppressing protrusion of the bump to a side of the light emitting element constituent portion in a case where the electrode provided on the dummy element constituent portion is connected to the substrate via the bump.