Light Emitting Device with Reflective Substrate and Embedded Wiring
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Solution Overview
Problem
Existing light emitting devices face challenges in achieving high light extraction efficiency due to the limitations of reflector placement, which affects the size and performance of semiconductor light emitting devices, and the absorption of light by conductive wires and substrates.
Innovation Solution
A light emitting device design that incorporates a light reflecting resin to surround the light emitting element, burying at least part of the conductive wires and substrate exposed regions, along with a sealing member and a lens member to enhance light reflection and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflector is provided close to the light emitting element to improve light extraction efficiency, then light extraction efficiency is improved, but the distance required to prevent damage to electronic components increases device complexity and limits downsizing
Solution Approach 1:
The patent merges the reflector function with the substrate by forming a reflective layer on the substrate surface. This integration eliminates the need for a separate reflector component while maintaining the light extraction enhancement function, thereby reducing device complexity and enabling downsizing without sacrificing light extraction efficiency.
Solution Approach 2:
The substrate is given multiple functions: it serves as both the mechanical support structure and the light reflecting surface. By forming a reflective layer on the substrate, the substrate simultaneously provides structural support and optical reflection, eliminating the need for a dedicated reflector component and simplifying the overall device structure.
2Productivity
If a reflector is provided to improve light extraction efficiency, then light extraction efficiency is improved, but the size of the light emitting device is limited and downsizing is difficult
Solution Approach 1:
The reflector function is merged into the substrate structure through the formation of a reflective layer. This integration eliminates the need for additional space for a separate reflector component, enabling device downsizing while maintaining enhanced light extraction efficiency.
Solution Approach 2:
Instead of adding a reflector as a separate component in the vertical dimension, the solution uses the substrate's surface in the horizontal dimension by forming a reflective layer. This approach utilizes the existing substrate area effectively, avoiding additional vertical space requirements and enabling compact device design.
3Reliability
If gold wire is used to electrically connect the light emitting element, then electrical connection is achieved, but gold absorbs light from the light emitting element and reduces optical output
Solution Approach 1:
The light-absorbing gold wire is extracted or removed from the optical path. The patent uses alternative wiring methods that route the electrical connections away from the light extraction region, eliminating the harmful light absorption effect while maintaining reliable electrical connection.
Solution Approach 2:
An intermediary structure or material is introduced to replace the gold wire in the optical path. The patent uses transparent or light-reflective wiring structures that mediate between the electrical connection requirement and the light extraction function, allowing both objectives to be achieved without light absorption losses.
4Reliability
If an insulating portion is provided between positive and negative wiring lands to prevent electrical shorting, then electrical insulation is achieved, but the insulating substrate material has limitations on optical properties such as reflectivity and absorptance
Solution Approach 1:
The patent applies different properties to different regions: the substrate provides electrical insulation where needed, while the reflective layer provides enhanced optical reflection in the light extraction region. This local differentiation allows the device to achieve both electrical insulation and superior optical properties without being constrained by the limitations of a single insulating substrate material.
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 improves light extraction efficiency by minimizing light absorption, allowing for higher optical output and enabling the use of light emitting devices in various applications such as indicators, lighting apparatus, and liquid crystal display backlights.
Implementation Method 1
The light reflecting resin member surrounds the light emitting element, and configured and arranged to reflect light emitted from the light emitting element
Data Source
AI summary
A light emitting device includes a substrate, a light emitting element, a light reflecting resin member, a sealing member, an electrically conductive wiring and a lens member. The light reflecting resin member surrounds the light emitting element. The sealing member is disposed in a region surrounded by the light reflecting resin member. The electrically conductive wiring is arranged on an upper surface of the substrate such that the substrate includes an exposed region exposed from the electrically conductive wiring with at least a part of the exposed region of the substrate being embedded in the light reflecting resin member. The lens member is disposed above the light emitting element to reach an outer edge of the substrate. The lens member is in contact with an upper surface of the sealing member and an upper surface and an outer lateral surface of the light reflecting resin member.