Reflecting Electrode Design for Light Emitting Devices
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Solution Overview
Problem
The manufacturing process of light emitting devices is complicated due to the need for a separate reflective film to concentrate light emitted by the light emitting element, which increases the complexity and cost of production.
Innovation Solution
A light emitting device design where the light emitting element is bonded to a wiring substrate with a light reflective electrode, where the area of the mounting region surrounding the reflecting electrode is greater than the light emitting element by four times or more, allowing the electrode to sufficiently reflect light without a separate reflective film, and incorporating holes in the bonding region to minimize bonding material overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separate reflective film is added to concentrate light, then light reflection efficiency is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the reflective film function with the existing wiring substrate by designing the mounting region to serve dual purposes: electrical connection and light reflection. The wiring substrate's mounting region is configured with sufficient area (4x or more than the light emitting element) to directly reflect light, eliminating the need for a separate reflective film layer and simplifying the manufacturing process while maintaining light concentration efficiency.
2Illumination intensity
If the mounting region area is increased to improve light reflection, then light reflection efficiency is improved, but device miniaturization is hindered
Solution Approach 1:
The mounting region of the wiring substrate is designed to perform multiple functions simultaneously: providing electrical connection for the light emitting element and serving as a light reflective surface. By configuring the mounting region area to be 4x or more than the light emitting element, it achieves sufficient light reflection capability while the wiring substrate itself handles the reflection function, avoiding additional space requirements for separate reflective components and enabling device miniaturization.
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
This design simplifies the manufacturing process by eliminating the need for a separate reflective film, ensuring effective light reflection while preventing reduction in the reflecting area, and allowing for miniaturization of the device without hindering its functionality.
Implementation Method 1
The reflecting electrode has a reflecting region which reflects light emitted from the light emitting element
Data Source
AI summary
A light emitting device includes a light emitting element that emits light, and a wiring substrate that includes a light reflective reflecting electrode to which the light emitting element is bonded using a bonding material. The reflecting electrode has a reflecting region which reflects light emitted from the light emitting element. An area of a mounting region surrounded by an outer circumference of the reflecting region is greater than an area of the light emitting element by four times or more seen in a direction perpendicular to the wiring substrate.