Reflective LED Package Structure for Corner Light Leakage
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Solution Overview
Problem
Conventional light emitting devices suffer from light blurring due to light leakage through the barrier member, especially at corner portions with low reflective material density, leading to reduced luminous area and interference with other drivers' visual fields in vehicle lamps.
Innovation Solution
Incorporating a reflective member that covers the side surfaces of the wavelength conversion member and light emitting chip, and a barrier member with an outer wall design that increases thickness from the upper surface to the side surface, preventing light from passing through and reducing light blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a barrier member containing reflective material is used to reflect light, then light reflection is improved, but light leakage occurs at corner portions with low reflective material density
Solution Approach 1:
The patent applies local quality by making the barrier member thickness non-uniform, specifically increasing thickness at corner portions where light leakage occurs. This localized thickness enhancement provides higher reflective material density precisely where needed, while maintaining standard thickness in other regions to avoid unnecessary complexity.
Solution Approach 2:
The patent transitions from a two-dimensional uniform barrier member to a three-dimensional structure with variable thickness. By adding the thickness dimension as a variable parameter, the barrier member can provide enhanced light reflection at specific locations (corners) without increasing overall device complexity proportionally.
2Object-generated harmful factors
If the barrier member thickness is increased to prevent light leakage, then light blurring is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of uniformly increasing barrier member thickness throughout, the patent applies thickness enhancement only at corner portions where light leakage and blurring occur. This localized approach reduces the overall device complexity compared to a uniform thick barrier member while still achieving the light control objective.
Solution Approach 2:
The barrier member is effectively segmented into regions of different thicknesses, with corner portions having increased thickness and other regions maintaining standard thickness. This segmentation allows the device to address light blurring problems without requiring a completely complex thick-barrier structure.
3Ease of manufacture
If reflective material is distributed uniformly across the barrier member, then manufacturing is simplified, but light leakage occurs at corner portions
Solution Approach 1:
The patent implements local quality by concentrating reflective material enhancement at corner portions of the barrier member rather than distributing it uniformly. This can be achieved through localized deposition processes or by forming thicker barrier material at corners, balancing manufacturing feasibility with improved light control at critical locations.
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 prevents light blurring and loss, maintaining a clear luminous area while ensuring drivers' visual fields are not obstructed, even in vehicle lamps, by reflecting light and reducing unnecessary light emission.
Implementation Method 1
A first reflective member covers a side surface of the first wavelength conversion member... the barrier member serves to reflect light emitted from the light emitting chips 11
Data Source
AI summary
The present disclosure relates to a light-emitting device. The light-emitting device includes a substrate, a first light-emitting chip, a first wavelength conversion member, and a barrier member. The first light-emitting chip is mounted on the substrate. The first wavelength conversion member covers the upper surface of the first light-emitting chip. A first reflective member covers the side surface of the first wavelength conversion member. Further, the barrier member includes an outer wall surrounding the side surfaces of the first light-emitting chip and the first reflective member.