Light Emitting Device Substrate With Linking Conductive Lands
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Solution Overview
Problem
Conventional light emitting devices face challenges in reducing emission diameter while maintaining or increasing luminous flux, which limits their application in narrow-angle light distribution applications such as projectors and other illumination systems.
Innovation Solution
The light emitting device incorporates a substrate with conductive members featuring specific land configurations and linking portions to facilitate high-density mounting of light emitting elements via flip-chip technology, allowing for reduced emission diameter and increased luminous flux by optimizing electrical connections and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emitting devices use a light emitting element and phosphor substance configuration, then white light emission is achieved, but the emission diameter is large and luminous flux is limited
Solution Approach 1:
The light emitting device is segmented into multiple light emitting elements (first light emitting element and second light emitting element) mounted on a substrate. Each element has its own electrode connections through separate conductive members, allowing independent optimization of each element's contribution to total luminous flux while maintaining a compact overall emission area.
Solution Approach 2:
The conductive members extend in multiple dimensions beyond simple planar connections. The conductive members have lands that extend in first and second directions with linking portions connecting them, creating a three-dimensional conductive pathway structure that optimizes both electrical connection and spatial arrangement, enabling higher density mounting without increasing emission diameter.
2Productivity
If multiple light emitting elements are mounted on a substrate, then luminous flux increases, but device complexity and mounting difficulty increase
Solution Approach 1:
The conductive members serve multiple functions simultaneously: they provide electrical connection between light emitting elements and external electrodes, act as structural support for mounting, and define the spatial arrangement of elements on the substrate. This multi-functionality reduces the need for separate components, simplifying the overall device structure despite multiple light emitting elements.
Solution Approach 2:
The conductive members combine multiple functional features into a single integrated structure. The lands in first and second directions with linking portions merge electrical connection pathways with mechanical mounting features, reducing the number of discrete components needed and simplifying the mounting process for multiple light emitting elements.
3Area of stationary object
If light emitting elements are densely mounted, then emission diameter reduces, but heat dissipation becomes more difficult
Solution Approach 1:
The conductive members are designed with varying land sizes and configurations in different regions of the substrate. Larger lands are positioned near heat-generating light emitting elements to provide enhanced thermal pathways, while the conductive structure adapts locally to optimize heat dissipation from each specific element without increasing overall emission diameter.
Solution Approach 2:
The conductive members act as intermediary structures between light emitting elements and the substrate, providing dedicated thermal pathways. The linking portions and extended lands create intermediate heat transfer zones that efficiently conduct heat away from densely packed elements before it reaches the substrate, maintaining compact dimensions while improving heat dissipation.
Data Source
AI summary
A light emitting device includes a substrate, conductive members, and first and second light emitting elements. The conductive members have first to fourth lands and a linking portion linking the second and third lands. An outer edge of the first land is positioned to the inside of a point at which an extension of a side facing the second land and an extension of a side facing the third land intersect. An outer edge of the fourth land is positioned to the inside of a point at which an extension of a side facing the second land and an extension of a side facing the third land intersect. The first light emitting element has electrodes connected to the first and second lands, and the second light emitting element has electrodes connected to the third and fourth lands.