Side-View Light-Emitting Structure With Lateral Heat Dissipation
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Solution Overview
Problem
Existing light-emitting devices have a large length between the light emission surface and the back surface, which can lead to increased size and reduced efficiency, particularly in side-view type devices.
Innovation Solution
A method of manufacturing a small light-emitting device involves forming an intermediate structure with layered bodies, including electrodes and a light-transmissive member, and then creating grooves and electrically conductive films to expose the light-reflective member, allowing for the efficient formation of multiple light-emitting devices with reduced substrate thickness and improved heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a circuit board is provided at the back-surface side of the light-emitting device, then the device structure is supported and components are mounted, but the length between the light emission surface and the back surface is increased
Solution Approach 1:
The patent repositions the circuit board from the back-surface side to the side surface of the light-emitting device. This dimensional change allows the circuit board to provide structural support and mount components without increasing the length between the light emission surface and back surface, thereby resolving the contradiction between structural support and compact length.
2Length of moving object
If the substrate thickness is reduced to achieve a compact design, then the device size is decreased, but heat dissipation becomes more difficult
Solution Approach 1:
The patent provides heat dissipation paths in the lateral direction by positioning heat dissipation structures at the side surfaces of the device. This allows heat to be dissipated through the side surfaces rather than requiring increased substrate thickness, thus resolving the contradiction between compact thickness and effective heat dissipation.
3Illumination intensity
If grooves and electrically conductive films are formed to expose the light-reflective member, then light extraction efficiency is improved and heat dissipation is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the device structure into distinct segments including grooves, electrically conductive films, and light-reflective member regions. This segmentation allows each component to be formed through specialized processes optimized for its function, improving light extraction and heat dissipation while managing manufacturing complexity through modular fabrication steps.
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 approach results in a smaller, more efficient light-emitting device with enhanced heat dissipation and improved light extraction efficiency, achieving a compact design while maintaining strong bonding and reduced leakage of light.
Implementation Method 1
a light-reflective member covering lateral surfaces of the layered body
Implementation Method 2
The pair of first electrically conductive films disposed on the first surface of the structure such that each of the pair of first electrically conductive films is connected to a respective one of the pair of electrodes
Implementation Method 3
a light-transmissive member disposed on the light-emitting element
Implementation Method 4
a bonding member bonding the second electrically conductive films to the mounting board
Data Source
AI summary
A light-emitting device includes: a structure including: a layered body including: a light-emitting element comprising a pair of electrodes, and a light-transmissive member disposed on the light-emitting element; and a light-reflective member covering lateral surfaces of the layered body, in which structure has a first surface at which the pair of electrodes are exposed from the light-reflective member, and a second surface connected to the first surface, the second surface being a surface of the light-reflective member. A pair of first electrically conductive films disposed on the first surface of the structure such that each of the pair of first electrically conductive films is connected to a respective one of the pair of electrodes. A pair of second electrically conductive films disposed on the second surface of the structure, each of the pair of electrically conductive films being continuous with the pair of first electrically conductive films.