Asymmetric LED Package Reflector for Backlight Color Uniformity
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Solution Overview
Problem
Conventional light-emitting device packages applied to edge-type backlight units suffer from color shading due to narrow directivity angles, and reducing the spacing between packages to mitigate this issue increases costs.
Innovation Solution
A light-emitting device package design featuring a reflective member with differing heights on its sides, allowing for increased directivity and light efficiency by exposing a side surface of a wavelength conversion member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light-emitting device packages is increased to reduce color shading, then color uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The reflective member is designed with asymmetric side heights, where one side extends higher than the other. This asymmetric configuration optimizes light reflection and extraction paths, improving color uniformity across the display panel without requiring increased package density, thereby avoiding additional manufacturing costs
Solution Approach 2:
The invention introduces vertical dimension variation through the asymmetric reflective member heights, creating different light extraction paths in the vertical direction. This dimensional approach enhances color uniformity by optimizing light distribution from the wavelength conversion member, alternative to simply increasing the number of packages horizontally
2Use of energy by moving object
If the directivity angle of light-emitting device packages is narrow, then light efficiency is improved, but color shading occurs between packages
Solution Approach 1:
The reflective member acts as an intermediary element between the LED chip and the wavelength conversion member. By strategically positioning the reflective member with asymmetric heights, it mediates light paths to enhance extraction efficiency while preventing color shading, achieving both narrow directivity and uniform color distribution
Solution Approach 2:
Different regions of the reflective member have different heights, creating local variations in light reflection characteristics. The higher side optimizes for light extraction in one direction while the lower side controls light paths in another direction, allowing simultaneous achievement of narrow directivity and reduced color shading
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 enhances directivity and light efficiency by laterally radiating light, reducing the need for closer package spacing and thus lowering costs.
Implementation Method 1
a reflective member disposed on the frame, forming a cavity for accommodating the LED chip therein, and reflecting light emitted from the LED chip
Implementation Method 2
a wavelength conversion member filled in the cavity to cover the LED chip
Data Source
AI summary
A light-emitting device package includes a frame including one side on which a first electrode is formed and the other side on which a second electrode is formed, an LED chip including a first conductive connection pad electrically connected to the first electrode and a second conductive connection pad electrically connected to the second electrode, a reflective member disposed on the frame, forming a cavity for accommodating the LED chip therein, and reflecting light emitted from the LED chip, and a wavelength conversion member filled in the cavity to cover the LED chip, wherein the reflective member includes a first side and a second side different from the first side, and a first height of the first side and a second height of the second side are formed to be different from each other.