Curved Resin Lighting Structure to Eliminate Edge Dark Lines
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Solution Overview
Problem
Conventional surface light source lighting devices for vehicles suffer from dark lines at the interface between the upper and side surfaces due to the significant distance between the light emitting device and the surface, 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 where the phosphor layer includes a curved surface to reduce the distance between the light source and the side surface, preventing dark lines and enhancing luminance uniformity by forming a curved boundary between the upper and side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the light emitting device is positioned far from the upper and side surfaces to create a three-dimensional effect, then the aesthetic sense and three-dimensional effect are improved, but dark lines are generated at the edge region due to light travel time delays
Solution Approach 1:
The patent applies curvature to the light guide plate, specifically making the distance from the light emitting device to the side surface shorter than the distance to the upper surface. This curved configuration ensures that light reaches the side surface more quickly, preventing dark lines while maintaining the three-dimensional aesthetic effect of the vehicle lamp.
2Illumination intensity
If the distance between the light emitting device and the side surface is reduced to prevent dark lines, then luminance uniformity is improved, but the three-dimensional effect and aesthetic sense are compromised
Solution Approach 1:
The light guide plate is designed with a curved profile where the distance from the light emitting device to the side surface is intentionally made shorter than the distance to the upper surface. This curvature simultaneously achieves luminance uniformity (preventing dark lines) and maintains the three-dimensional aesthetic effect required for vehicle lamps.
3Ease of manufacture
If conventional polyhron structures with bent surfaces are used, then manufacturing is simplified, but significant distance delays cause dark lines at the interface between upper and side surfaces
Solution Approach 1:
Instead of using conventional polyhron structures with bent surfaces, the patent employs a light guide plate with a curved profile. This curvature design simplifies the overall structure while ensuring that light reaches the side surface more quickly, thereby preventing dark lines at the interface between upper and side surfaces.
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 effectively prevents dark lines and improves luminance uniformity, providing a more aesthetically pleasing and efficient light distribution across the surface.
Implementation Method 1
a phosphor layer disposed on the resin layer
Data Source
AI summary
A lighting device includes a substrate, light sources having a first light source on the substrate, a resin layer sealing the plurality of light sources on the substrate; and a light transmitting layer on the resin layer. A surface of the resin layer has an upper surface and side surfaces, and the side surfaces of the resin layer has a convex curved surface. The light transmitting layer has a first flat region on the upper surface of the resin layer and a second curved region on the side surfaces of the resin layer. The convex curved surface of the resin layer and the second curved region of the light transmitting layer overlap the first light source in a vertical direction, and a corner between two adjacent the side surfaces of the resin layer has a convex curved surface.