Light-emitting device with variable light absorbing layer
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Solution Overview
Problem
Conventional light-emitting devices face challenges in adjusting optical properties after mounting, particularly in severe environments, due to the difficulty in modifying the light-emitting element and functional elements post-sealing, which can result in suboptimal performance and stability issues.
Innovation Solution
A light-emitting device incorporating a substrate, electrodes, a light-emitting element, a variable light absorbing layer containing metal oxide particles that change light absorption properties with ultraviolet irradiation, and a translucent sealing body, allowing for adjustable optical output by modifying the light absorption properties of the variable light absorbing layer post-manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-emitting device is sealed to protect functional elements and electrodes, then reliability is improved, but the ability to adjust optical properties after mounting deteriorates
Solution Approach 1:
The patent divides the optical control function into two independent parts: a fixed optical element (lens or reflector) integrated with the light-emitting element, and a separate variable light absorbing layer that can be adjusted independently. This segmentation allows the sealing structure to protect the fixed optical elements while leaving the variable layer accessible for post-mounting adjustment, thus resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent incorporates a variable light absorbing layer (such as a PDLC film or electrochromic layer) into the sealing structure during manufacturing, but designs it to remain adjustable after sealing. The layer is preliminarily configured to provide optical control, yet maintains the capability for post-mounting adjustment through electrical signals or UV irradiation, allowing both initial protection and future adaptability.
2Manufacturing precision
If manufacturing processes are made precise to meet required optical properties, then manufacturing precision is improved, but the ability to compensate for errors after mounting deteriorates
Solution Approach 1:
The patent incorporates a variable light absorbing layer that can change its optical parameters (light absorption, transparency, color) after manufacturing through external stimuli such as electrical signals or UV irradiation. This allows the optical properties to be adjusted post-mounting to compensate for manufacturing variations, directly addressing the limitation of fixed optical characteristics in conventional sealed devices.
Solution Approach 2:
The patent transforms the static optical properties of conventional sealed devices into dynamic, adjustable parameters. The variable light absorbing layer enables real-time modification of optical characteristics after sealing, allowing the device to adapt to actual performance requirements and compensate for manufacturing errors that were previously irreversible.
3Illumination intensity
If the light-emitting element is designed to meet specific optical output requirements, then optical property is improved, but the complexity of modifying elements after sealing increases
Solution Approach 1:
The patent introduces a variable light absorbing layer as an intermediary component between the light-emitting element and the external environment. This intermediary layer provides optical control without requiring direct modification of the light-emitting element itself, simplifying post-mounting adjustments while maintaining precise control over optical output characteristics.
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
Enables easy adjustment of optical properties after mounting, ensuring high-quality and long-lasting performance by protecting the electrodes and maintaining stable electric and optical properties in various environments.
Implementation Method 1
The variable light absorbing layer contains a plurality of metal oxide particles that change a light absorption property by irradiation with an ultraviolet light
Data Source
AI summary
A light-emitting device includes a substrate, an electrode, a light-emitting element, a variable light absorbing layer, and a sealing body. The electrode is formed on the substrate. The light-emitting element is disposed on the substrate and electrically connected to the electrode. The variable light absorbing layer is formed so as to cover the electrode on the substrate. The variable light absorbing layer contains a plurality of metal oxide particles that change a light absorption property by irradiation with an ultraviolet light. The sealing body is formed on the substrate so as to seal the light-emitting element. The sealing body has translucency to a light emitted from the light-emitting element.