Asymmetric Electrode Arrangement for Uniform Light Intensity
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Solution Overview
Problem
Conventional light-emitting elements with flip-chip packaging face challenges in achieving uniform light intensity distribution due to uneven electric current supply and electrode arrangements.
Innovation Solution
A light-emitting element design featuring a semiconductor layered body with a polygonal shape, an insulating film with specific openings, and electrodes arranged to balance the electric current distribution, with a smaller total area of n-contact portions on one edge and a larger area on the opposite edge, enhancing light emission intensity uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electrode arrangements are used in light-emitting elements, then manufacturing is simplified, but light intensity distribution becomes non-uniform
Solution Approach 1:
The patent applies asymmetry by making the n-side electrode arrangement asymmetric with respect to the light-emitting surface. Specifically, the total contact area of n-side electrodes on the first edge side is made larger than on the second edge side, creating an intentional asymmetric distribution that compensates for non-uniform current flow and achieves more uniform light intensity distribution across the surface.
2Illumination intensity
If electrode areas are increased to improve current distribution, then light intensity uniformity improves, but forward voltage increases
Solution Approach 1:
The patent applies local quality by differentiating the electrode contact areas at different locations. The n-side electrodes on the first edge side have larger total contact area compared to those on the second edge side. This localized variation in electrode area allows optimization of current distribution in specific regions without uniformly increasing the total electrode area, thereby improving light uniformity while controlling forward voltage increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves light intensity distribution on the surface of the light-emitting element by optimizing electrode arrangements, reducing deviations in light emission intensity and minimizing forward voltage increases.
Implementation Method 1
a semiconductor layered body 12, an insulating film 16, an n-side electrode 13, and a p-side electrode 17... The p-type semiconductor layer 12p is disposed on the n-type semiconductor layer 12n except a portion
Data Source
AI summary
A light-emitting element includes a semiconductor layered body comprising: an n-type semiconductor layer, and p-type semiconductor layer; an insulating film disposed on the semiconductor layered body and defining at least one p-side opening above the p-type semiconductor layer and a plurality of n-side openings exposing the n-type semiconductor layer; an n-side electrode disposed on the insulating film and comprising a plurality of first n-contact portions each electrically connected to the n-type semiconductor layer through one of the plurality of n-side openings; a p-side electrode electrically connected to the p-type semiconductor layer through the at least one p-side opening; a p-side post electrode disposed on the p-side electrode; and an n-side post electrode disposed on the n-side electrode. A total area of one or more first n-contact portions located on the second side is smaller than a total area of one or more first n-contact portion located on the first side.