Curved Phosphor Layer for Uniform Vehicle Surface Lighting
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Solution Overview
Problem
Conventional surface light source lighting devices for vehicles suffer from dark lines at the edge regions due to the distance between the upper and side surfaces, leading to non-uniform luminance and aesthetic issues.
Innovation Solution
A lighting device design featuring a substrate with light sources, a resin layer, and a phosphor layer with a curved surface configuration, where the phosphor layer includes a first region overlapping the light sources and a second region extending towards the substrate, reducing the distance between the light source and the phosphor layer's edge, and incorporating a red ink for uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the upper surface and side surface are bent with considerable distance from the light emitting device, then the three-dimensional effect and aesthetic sense are improved, but dark lines are generated on the edge region due to light travel time delay
Solution Approach 1:
The patent applies curvature to the phosphor layer by forming a curved surface that extends from the upper surface toward the light emitting device. This curved configuration reduces the distance between the light source and the phosphor layer at edge regions, eliminating dark lines while maintaining the three-dimensional aesthetic effect of the lamp housing.
Solution Approach 2:
The patent introduces a vertical dimension to the phosphor layer configuration by extending it downward toward the light emitting device from the upper surface. This dimensional change creates a curved surface profile that optimizes light interaction, ensuring uniform luminance distribution across the emission surface while preserving the three-dimensional shape.
2Illumination intensity
If the distance between the light emitting device and the phosphor layer edge is reduced, then dark lines are prevented and luminance uniformity is improved, but the three-dimensional effect may be compromised
Solution Approach 1:
The curved surface configuration of the phosphor layer simultaneously achieves both goals: it reduces the distance to the light source at edge regions to eliminate dark lines, while maintaining the overall three-dimensional aesthetic effect through its curved profile that extends vertically toward the light emitting device.
Solution Approach 2:
The phosphor layer is configured with different local geometries: a curved surface region extending toward the light source to ensure uniform luminance, and an upper surface region that maintains the three-dimensional aesthetic effect. This local differentiation allows both requirements to be satisfied in different zones of the same component.
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
Prevents dark lines and enhances luminance uniformity by reducing the distance between the light source and the phosphor layer's edge, resulting in improved light distribution and aesthetic appeal.
Implementation Method 1
a phosphor layer disposed on the resin layer and including a curved surface
Data Source
AI summary
A lighting device may include a substrate, light sources, a resin layer disposed on the substrate and the light sources, and a phosphor layer disposed on the resin layer. A surface of the resin layer has a flat upper surface and a plurality of side surfaces on an outer side of the flat upper surface. At least one of the plurality of side surfaces of the resin layer has a curved surface. The phosphor layer has a first region disposed on the flat upper surface of the resin layer and a second region disposed on the plurality of side surfaces of the resin layer. Light generated from the plurality of light sources is emitted through the flat upper surface and the curved surface of the resin layer.