LED Vehicle Light Assembly with Segmented Diffuser Lens
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Solution Overview
Problem
Vehicle taillights using LEDs face challenges in providing distinct illumination for different functions due to the production of hot spots, necessitating a solution that differentiates between taillight, stop, and turn light functions effectively.
Innovation Solution
An LED vehicle light assembly featuring a base with recesses for outer and inner arrays of LEDs, a diffuser lens covering only the outer array, and a cover lens that covers both arrays, where the outer array provides continuous taillight illumination and the inner array illuminates only during brake or turn signal engagement, with the diffuser lens reducing hot spots by diffusing light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used in vehicle taillights, then energy efficiency and longevity are improved, but hot spots are produced in the light display
Solution Approach 1:
A diffuser lens is introduced as an intermediary component between the LED light source and the external environment. The diffuser lens scatters the concentrated light from LEDs, transforming the harmful hot spots into a more uniform light distribution while preserving the energy efficiency benefits of LED technology.
Solution Approach 2:
The patent applies different optical properties to different regions of the light assembly. The diffuser lens covers only the outer array of LEDs, allowing selective diffusion of light from specific LED groups. This creates locally optimized light patterns where the outer ring provides diffuse taillight illumination while the inner array can maintain focused light for stop and turn functions.
2Object-generated harmful factors
If a diffuser lens is used to reduce hot spots, then light uniformity is improved, but functional differentiation between taillight and stop functions deteriorates
Solution Approach 1:
The LED array is segmented into two distinct groups: an outer array covered by the diffuser lens for taillight function, and an inner array without diffuser coverage for stop and turn functions. This spatial segmentation allows each LED group to serve a specific function with appropriate light characteristics, maintaining functional differentiation while the diffuser reduces hot spots from the outer array.
Solution Approach 2:
Different optical treatments are applied to different spatial regions. The outer array region receives diffuser lens coverage to eliminate hot spots for continuous taillight illumination, while the inner array region maintains direct LED exposure to preserve focused, high-intensity light patterns needed for stop and turn signal differentiation.
3Device complexity
If a single light array is used, then device complexity is reduced, but the ability to provide distinct illumination for different functions deteriorates
Solution Approach 1:
The single light array is divided into two functional segments: an outer array for taillight function and an inner array for stop/turn functions. The diffuser lens is also segmented to cover only the outer array. This segmentation enables distinct illumination patterns for different functions while maintaining a relatively simple overall structure without requiring completely separate light assemblies.
Solution Approach 2:
The patent implements multi-functionality within a unified light assembly structure. The same base housing and cover lens protect both LED arrays, while the selective application of the diffuser lens enables the outer array to provide diffuse taillight illumination and the inner array to provide focused stop/turn signals, achieving functional versatility without proportionally increasing structural complexity.
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 effectively differentiates between taillight and stop/turn functions by providing a ring of diffuse light for taillights and focused light for stop and turn signals, reducing hot spots and enhancing functional differentiation in LED vehicle lighting.
Implementation Method 1
a diffuser lens located at the front of the base, where the diffuser lens is sized and shaped to cover the outer array of lights but not the inner array of lights
Implementation Method 2
The lights on the outer array of lights and the lights on the inner array of lights may be light emitting diodes
Data Source
AI summary
An LED vehicle light assembly providing a ring of diffuse light for taillight functions surrounding an area of non-diffuse light for stop and turn functions.