LED Lighting Device With Variable-Height Reflectors for Uniform Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lighting devices using light emitting diodes (LEDs) face challenges in expanding the light emitting area and achieving uniform light distribution due to their small emission angle, limiting design freedom and efficiency.
Innovation Solution
A lighting device with a light guide member featuring a substrate, a light source, and reflective surfaces of varying heights and inclinations, including a first reflective surface with multiple inclined portions and a second reflective surface, which guides light to an exit surface to form a dot matrix pattern, enhancing light distribution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light emitting diode is used as a vehicle lamp, then power consumption is reduced, but the light emitting area is limited due to small emission angle
Solution Approach 1:
The patent transitions from a single-point light source to a planar light guide member with distributed light emission. The light guide member spreads light across a two-dimensional surface, transforming the emission from a zero-dimensional point to a two-dimensional area, thereby increasing the effective light emitting area while maintaining LED power efficiency.
Solution Approach 2:
The light guide member acts as an intermediary between the LED light source and the final light emission. It receives concentrated light from the LED and redistributes it across a larger area through its internal structure, solving the contradiction between the small emission area of the LED and the need for large light emitting area in vehicle lamps.
2Adaptability or versatility
If a light emitting diode is used as a vehicle lamp, then design freedom is increased due to small size, but light distribution uniformity deteriorates
Solution Approach 1:
The invention extends the light emission from a point source to a planar distribution, allowing for controlled light patterns across a two-dimensional surface. This enables uniform light distribution and various design patterns while maintaining the compact size advantage of LEDs.
3Manufacturing precision
If reflective surfaces with varying heights are used, then light distribution uniformity is improved, but device complexity increases
Solution Approach 1:
The light guide member is divided into multiple segments or regions with different heights, each segment contributing to uniform light distribution in specific areas. This segmentation allows control of light paths without requiring a completely complex overall structure, as each segment independently manages local light distribution.
Solution Approach 2:
Different regions of the light guide member have locally optimized heights and reflective properties tailored to their specific functions. This local quality approach achieves overall light uniformity by optimizing each region independently, rather than requiring uniform complexity throughout the entire structure.
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 device provides improved light uniformity and various light distribution patterns, enhancing optical reliability and versatility in lighting applications.
Implementation Method 1
a first reflective surface facing the exit surface, wherein the first reflective surface comprises a plurality of reflective portions having different heights with respect to an upper surface of the substrate, and each of the plurality of reflective portions may comprise a plurality of first surfaces inclined with respect to the upper surface of the substrate
Data Source
AI summary
A lighting device disclosed in an embodiment of the invention comprises a substrate; a light source disposed on the substrate; and a light guide member disposed on the substrate and the light source, wherein the light guide member includes an exit surface and a first reflective surface facing the exit surface, the first reflective surface includes a plurality of reflective portions having different heights with respect to an upper surface of the substrate, and each of the plurality of reflective portions may include a plurality of first surfaces inclined with respect to the upper surface of the substrate.