Light Emitting Device with Light-Shielding Adhesive
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Solution Overview
Problem
Existing light emitting devices with flexible substrates, such as polyimide, face deterioration due to light exposure, leading to potential discoloration and strength degradation, which can affect the device's withstand voltage and reliability.
Innovation Solution
A light emitting device structure featuring a flexible resin base member with wiring portions and a groove portion, where an adhesive agent containing a light-shielding member is used to cover the groove and shield specific wavelengths of light emitted by the light emitting elements, reducing exposure and deterioration of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base member is made of a flexible resin material to maintain flexibility, then the device can be bent and conform to surfaces, but the resin substrate deteriorates due to light exposure causing discoloration and strength degradation
Solution Approach 1:
The patent introduces an adhesive agent layer containing light-shielding particles as an intermediary between the resin base member and the wiring portions. This adhesive layer blocks specific wavelengths of light from reaching the resin substrate, preventing photo-degradation while maintaining the flexible nature of the base member. The adhesive agent serves as a mediator that protects the resin without compromising its flexibility.
Solution Approach 2:
The adhesive agent is formulated as a composite material combining resin binder with light-shielding particles (such as metal particles or pigments). This composite structure provides both adhesive functionality and optical shielding properties, protecting the resin base member from light-induced deterioration while maintaining structural integrity and flexibility.
2Productivity
If wiring portions are arranged closely to increase device density, then more light emitting elements can be integrated, but light from one element may interfere with adjacent elements causing optical crosstalk
Solution Approach 1:
The adhesive agent containing light-shielding particles acts as an intermediary barrier between adjacent wiring portions and light emitting elements. This layer prevents light from one element from reaching adjacent elements through the substrate, eliminating optical crosstalk while allowing high-density integration of light emitting elements.
Solution Approach 2:
The light-shielding properties are localized to the adhesive agent regions between wiring portions, providing targeted optical isolation where needed. The wiring portions themselves and the light emitting elements maintain their original optical characteristics, achieving local shielding without compromising overall device performance.
3Reliability
If the adhesive agent is extended to cover the groove portion to provide complete light shielding, then substrate protection is improved, but the amount of adhesive material increases
Solution Approach 1:
The adhesive agent is strategically extended to cover the groove portions between wiring portions where light shielding is most critical. This localized extension provides maximum protection with minimum material, as the groove areas are the primary pathways for light to reach the substrate. The adhesive coverage is optimized to protect vulnerable areas without unnecessary material usage in already-covered regions.
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 solution effectively reduces substrate degradation and enhances the reliability of the light emitting device by shielding light and improving heat dissipation, while maintaining flexibility and optical efficiency.
Implementation Method 1
The adhesive agent... contains a light-shielding member. The light-shielding member shields the base member from at least a specific wavelength of light emitted from the light emitting element.
Data Source
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AI summary
Provided is a light emitting device in which deterioration of the substrate member can be reduced. The light emitting device includes a base member mainly made of a resin, a plurality of wiring portions and arranged on the base member via an adhesive agent, a groove portion defined between adjacent wiring portions, and at least one light emitting element which is disposed straddling at least a part of the groove portion. The adhesive agent is applied covering the base member from the groove portion, and contains a light-shielding member. The light-shielding member shields the base member from light, for example at a specific wavelength, emitted from the at least one light emitting element.