Light Emitting Device with Nested Protective Element and Reflecting Resin
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Solution Overview
Problem
Existing light emitting devices face challenges in miniaturization and light extraction efficiency due to the absorption of light by protective elements and complex manufacturing processes, with previous solutions either compromising luminous efficiency or complicating the manufacturing process.
Innovation Solution
A light emitting device design featuring a base member with a light emitting element and a protective element separated by a first electrically conductive joining member, creating a space filled with a light reflecting resin to suppress light absorption and simplify the manufacturing process, allowing for downsizing while maintaining efficient light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective element is disposed adjacent to a light emitting element, then the protective element can prevent damage to the light emitting element, but the whole element-mounting region increases and miniaturization cannot be attained
Solution Approach 1:
The protective element is disposed under the light emitting element, nesting it within the same mounting footprint. This allows the protective element to be positioned in the space between the light emitting element and the base member, enabling miniaturization while maintaining protection functionality
Solution Approach 2:
The protective element is positioned in the vertical dimension (under the light emitting element) rather than adjacent in the horizontal plane. This dimensional change allows both elements to coexist within the same planar footprint, reducing the overall mounting area
2Use of energy by moving object
If a protective element is covered with a reflecting layer, then the luminous efficiency is maintained, but the device complexity increases
Solution Approach 1:
The reflecting layer is removed from the protective element and replaced with a light reflecting resin that fills the space around the protective element. This extraction simplifies the structure by eliminating the need for a reflecting layer on the protective element itself while maintaining the light reflection function
Solution Approach 2:
The light reflecting resin serves multiple functions: it reflects light away from the protective element, fills the space between components, and provides structural support. This multi-functionality reduces device complexity while maintaining luminous efficiency
3Stress or pressure
If a recess is formed in the base material to incorporate the protective element, then the stress in the mounting region is reduced, but resin filling becomes difficult and voids occur
Solution Approach 1:
Instead of forming a recess in the base member, the protective element is disposed on the flat surface of the base member. This inversion of the approach eliminates the resin filling difficulty and void formation while still reducing stress through the use of a flexible joining member
4Area of stationary object
If the protective element is disposed under the light emitting element, then miniaturization is achieved, but light absorption by the protective element may reduce light extraction efficiency
Solution Approach 1:
A light reflecting resin is introduced as an intermediary between the protective element and the light emitting element. This mediator reflects light away from the protective element, preventing light absorption while maintaining the miniaturized configuration
Solution Approach 2:
The light reflecting function is extracted from the protective element itself and implemented through a separate light reflecting resin. This allows the protective element to remain transparent to light while still achieving the light reflection effect needed to maintain extraction efficiency
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 suppresses light absorption by the protective element, enabling the miniaturization of light emitting devices and improving light extraction efficiency while simplifying the manufacturing process.
Implementation Method 1
a light reflecting resin is arranged in the space to cover the protective element
Data Source
AI summary
A light emitting device includes a base member; a light emitting element disposed on the base member via at least one first electrically conductive joining member such that a space is located between the light emitting element and a surface of the base member; and a protective element disposed on the base member via at least one second electrically conductive joining member. The protective element is located in the space. A light reflecting resin is located in the space and covers the protective element.