Multi-Layer Ink PCB Light Emitting Device Luminance
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Solution Overview
Problem
Conventional light emitting devices using printed circuit board (PCB) substrates suffer from non-uniform luminance due to varying light emission across the surface, with light emitted from sources being partially absorbed rather than reflected, leading to reduced overall luminosity and potential moire and blur issues in display devices.
Innovation Solution
A light emitting device design featuring a PCB substrate with a first ink layer having a specific refractive index and reflectivity, and a second ink layer with a different refractive index and higher reflectivity, strategically positioned to enhance light reflection and distribution, including semi-spherical lenses to uniformly diffuse light emitted from LED packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting members are mounted on a PCB substrate with conventional single-layer ink, then the device structure is simple, but the luminance is non-uniform and light is partially absorbed rather than reflected
Solution Approach 1:
The ink layer is segmented into multiple layers (first ink layer and second ink layer) with different refractive indices and reflectivities. The first ink layer has lower reflectivity while the second ink layer has higher reflectivity, creating a gradient structure that progressively reflects light to achieve uniform luminance across the PCB substrate.
Solution Approach 2:
Different regions of the ink layer structure have different optical properties. The first ink layer covers areas requiring light transmission while the second ink layer is positioned in regions requiring enhanced reflection. This local differentiation of optical properties enables uniform light distribution across the entire substrate.
2Illumination intensity
If a single ink layer with uniform reflectivity is used, then the manufacturing process is simple, but light distribution is non-uniform causing moire and blur issues
Solution Approach 1:
The solution transitions from a single-dimensional (single-layer) ink structure to a multi-dimensional (multi-layer) ink structure. By adding the vertical dimension of layering with different optical properties, the system achieves superior light distribution uniformity while managing manufacturing complexity through systematic layer deposition.
Solution Approach 2:
The ink layer is constructed as a composite structure with multiple materials having different refractive indices and reflectivities. The first ink layer and second ink layer are composed of different materials or formulations, creating a composite optical system that achieves uniform light distribution through the synergistic interaction of layers with complementary properties.
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 achieves uniform luminance across the PCB substrate by effectively reflecting and re-distributing light from non-emitting areas, increasing overall light output and reducing moire and blur phenomena in display applications.
Implementation Method 1
The first ink layer may have a first refractive index and a first reflectivity. The second ink layer may have a second refractive index different from the first refractive index and a second reflectivity different from the first reflectivity
Implementation Method 2
The first ink layer may have a first refractive index. The second ink layer may have a second refractive different from the first refractive index
Implementation Method 3
a lens disposed on the first ink layer to be spaced apart from the light emitting member, and at least one ink layer on the first ink layer, the ink layer disposed at an outside of the lens. The lens may cover the light emitting member, and each of upper and lower surfaces of the lens may have a semi-spherical shape
Data Source
AI summary
A light emitting device includes a printed circuit board (PCB) substrate, a first ink layer covering the PCB substrate, the first ink layer having a first refractive index, light emitters on the first ink layer, and a second ink layer on the first ink layer and spaced apart from the light emitters, the second ink layer having a second refractive index different from the first refractive index.