Light Emitting Device with Inclined Light-Transmissive Member
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Solution Overview
Problem
Existing light emitting devices face challenges in accurately aligning light-transmissive members with light emitting elements, leading to potential light leakage and non-uniform luminance due to sagging adhesive members and inefficient light extraction.
Innovation Solution
A light emitting device design featuring a light-transmissive member with inclined surfaces and a light-transmissive adhesive member positioned inside the second lateral surface, which self-aligns to prevent sagging and ensure accurate placement, while a light-reflective member covers the second lateral surface to prevent light leakage, creating a clear boundary between light-emitting and non-light-emitting sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent adhesive material is used to adhere the light-transmissive member to the light emitting element, then the light emitting device can be assembled, but the adhesive member sags and causes misalignment between the light-transmissive member and the light emitting element
Solution Approach 1:
The light-transmissive member is designed with a specific shape where the lower surface is positioned inside the peripheral edge of the upper surface of the light emitting element in plan view. This preliminary geometric configuration ensures that when the adhesive member is applied, it is constrained within the boundaries defined by the light-transmissive member's geometry, preventing sagging and maintaining alignment accuracy throughout the assembly process
Solution Approach 2:
The light-transmissive member acts as an intermediary structure between the light emitting element and the adhesive member. Its specific geometry (with lower surface inside the peripheral edge of upper surface) serves as a physical barrier and guide that prevents the adhesive from sagging outward, thereby maintaining precise alignment without requiring additional alignment mechanisms
2Volume of moving object
If the light-transmissive member is positioned close to the light emitting element for compact design, then the device size is reduced, but light leakage occurs at the edges
Solution Approach 1:
The lateral surfaces of the light-transmissive member are segmented into different functional zones: the first lateral surface with inclined surfaces that are positioned inside the peripheral edge of the light emitting element to manage light extraction, and the second lateral surface positioned above and outside to contain the adhesive and prevent light leakage. This segmentation allows compact positioning while maintaining optical performance
Solution Approach 2:
Different portions of the light-transmissive member are given different geometric properties: the first lateral surface has inclined surfaces optimized for light extraction efficiency, while the second lateral surface is positioned to provide edge containment. This local differentiation of geometric properties allows the structure to simultaneously achieve compact size and prevent light leakage at critical locations
3Manufacturing precision
If the adhesive member covers the first lateral surface to prevent sagging, then alignment is improved, but light extraction efficiency decreases due to adhesive interference
Solution Approach 1:
The light-transmissive member is pre-configured with inclined surfaces on the first lateral surface that are positioned inside the peripheral edge of the light emitting element. This preliminary geometric arrangement ensures that when adhesive is applied, it naturally conforms to the inclined surfaces without creating excessive thickness or sagging, thereby maintaining both alignment accuracy and light extraction efficiency
Solution Approach 2:
The inclined surfaces of the first lateral surface are designed with specific angles and orientations that optimize the balance between adhesive coverage and light extraction. By carefully controlling the geometric parameters of these inclined surfaces, the design achieves sufficient adhesive coverage for alignment while minimizing the adverse impact on light 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 design achieves accurate alignment and reduced light leakage, resulting in a sharp difference in luminance between light-emitting and non-light-emitting sections with a clear boundary, enhancing light extraction efficiency and reducing non-uniformity in light emission.
Implementation Method 1
a light-transmissive adhesive member positioned inside the second lateral surface in plan view, and adhering the upper surface of the light emitting element and the lower surface of the light-transmissive member to each other and covering the first lateral surface
Implementation Method 2
a light-reflective member covering the second lateral surface
Implementation Method 3
a first lateral surface having at least one inclined surface extending from the lower surface and inclined with respect to the upper surface of the light emitting element
Data Source
AI summary
A light emitting device includes a light emitting element; a light-transmissive member that has a lower surface positioned inside a peripheral edge of an upper surface of the light emitting element in plan view, a first lateral surface extending from the lower surface and having at least one inclined surface that is inclined with respect to the upper surface of the light emitting element, and a second lateral surface positioned above and outside the first lateral surface; a light-transmissive adhesive member positioned inside the second lateral surface in plan view, wherein the adhesive member adheres the upper surface of the light emitting element and the lower surface of the light-transmissive member to each other and covers the first lateral surface; and a light-reflective member covering the second lateral surface.