LED Package Fresnel Lens Structure for Wide-Angle Flash Alignment
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Solution Overview
Problem
Existing LED packages for flash illumination in electronic devices face challenges in achieving high central illuminance and super wide angle light alignment simultaneously, which affects user experience and device reliability.
Innovation Solution
The LED package includes an LED chip on a substrate with an adhesive phosphor film and a Fresnel lens cell lens, covered by a lateral reflective layer, featuring an air gap between the cell lens and the phosphor film, and a vent hole in the cell lens to enhance light distribution and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional LED package structure is used, then the structure is simple and easy to manufacture, but the light distribution cannot achieve both high central illuminance and super wide angle alignment simultaneously
Solution Approach 1:
The package structure is segmented into multiple functional layers: LED chip, adhesive phosphor film, cell lens with Fresnel structure, and lateral reflective layer. Each layer performs a specific optical function to achieve both high central illuminance and wide angle distribution through coordinated design
Solution Approach 2:
The cell lens incorporates a Fresnel structure with curved refractive surfaces that manipulate light propagation angles. The curved geometry enables wide angle light distribution while the precise optical design maintains high central illuminance through controlled refraction
2Use of energy by moving object
If the cell lens directly contacts the phosphor film, then the structure is compact, but light incidence efficiency is reduced and air bubbles may form
Solution Approach 1:
An air gap is introduced as an intermediary space between the cell lens and phosphor film. This air gap prevents direct contact that would cause light refraction losses and air bubble formation during assembly, while the lateral reflective layer acts as a mediator to redirect light that would otherwise be lost, maintaining high light incidence efficiency
Solution Approach 2:
The air gap is positioned specifically at the interface between the cell lens and phosphor film where light enters the lens. This localized structural modification optimizes light incidence efficiency at the critical interface without requiring changes to the entire package structure
3Illumination intensity
If the lateral reflective layer extends beyond the substrate, then light reflection is improved, but the package size increases
Solution Approach 1:
The lateral reflective layer is merged with the substrate to form an integrated structure. The reflective layer extends laterally to capture and redirect light that would otherwise escape, improving light distribution without requiring additional external components or increasing the overall package footprint
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 configuration improves light intensity and wide-angle light distribution, enabling high central illuminance and super wide angle light alignment, thereby enhancing user experience and device reliability by maximizing light incidence efficiency through a small optical window.
Implementation Method 1
The cell lens includes a Fresnel lens
Implementation Method 2
a cell lens arranged on the adhesive phosphor film
Implementation Method 3
a lateral reflective layer covering respective lateral surfaces of the LED chip, the adhesive phosphor film, and the cell lens
Implementation Method 4
an adhesive phosphor film arranged on the LED chip
Data Source
AI summary
A light-emitting diode (LED) package includes an LED chip on a substrate, an adhesive phosphor film on the LED chip, a cell lens on the adhesive phosphor film, and a lateral reflective layer covering respective lateral surfaces of the LED chip, the adhesive phosphor film, and the cell lens, a lateral surface of the lateral reflective layer being coplanar with a lateral surface of the substrate.