Light-Reflective Anisotropic Conductive Adhesive for LED Efficiency
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Solution Overview
Problem
Conventional light-emitting devices face efficiency issues due to light absorption by gold wires and die bond adhesives, and the cost increase associated with providing a light-reflecting layer in flip chip mounting techniques, which complicates improving light-emitting efficiency.
Innovation Solution
Incorporating light-reflective insulating particles, such as titanium oxide, zinc oxide, or aluminum oxide, into an anisotropic conductive adhesive to enhance light reflection and maintain color consistency without the need for a separate light-reflecting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light-reflecting layer is provided on the LED element surface to improve light-emitting efficiency, then light extraction efficiency is improved, but production costs increase due to additional manufacturing steps
Solution Approach 1:
The patent combines the light-reflecting function with the anisotropic conductive adhesive by incorporating light-reflective insulating particles into the adhesive composition. This merging eliminates the need for a separate light-reflecting layer while maintaining light extraction efficiency, thereby reducing production process complexity and costs.
Solution Approach 2:
The anisotropic conductive adhesive is given multiple functions: it provides electrical conductivity, mechanical bonding, and light reflection. By making the adhesive multi-functional, the patent eliminates the need for separate functional layers, simplifying the device structure and reducing manufacturing complexity.
2Ease of manufacture
If conventional anisotropic conductive paste or film is used without light-reflective particles, then production costs are lower, but light-emitting efficiency deteriorates due to brown color absorption
Solution Approach 1:
The patent creates a composite anisotropic conductive adhesive by combining conventional conductive particles, thermosetting resin, and light-reflective insulating particles. This composite material maintains the electrical conductivity of conventional adhesives while adding light-reflecting properties to prevent color absorption and improve light extraction efficiency.
Solution Approach 2:
The patent converts the harmful light absorption by brown-colored adhesive materials into a beneficial reflection by incorporating light-reflective particles. These particles reflect the absorbed light wavelengths back, transforming the adhesive from a light-absorbing harmful element into a light-reflecting beneficial component.
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 light-reflective anisotropic conductive adhesive effectively improves light-emitting efficiency by reflecting light without altering the color, reducing production costs by eliminating the requirement for a separate light-reflecting layer.
Implementation Method 1
the light-reflective anisotropic conductive adhesive effectively improves light-emitting efficiency by reflecting light without altering the color
Data Source
AI summary
A light-reflective anisotropic conductive adhesive used for anisotropic conductive connection of a light-emitting element to a wiring board includes a thermosetting resin composition, conductive particles, and light-reflective insulating particles. The light-reflective insulating particles are at least one of inorganic particles selected from the group consisting of titanium oxide, boron nitride, zinc oxide, and aluminum oxide, or resin-coated metal particles formed by coating the surface of scale-like or spherical metal particles with an insulating resin.