Polyhedral LED Lighting Device for Mobile Flash Illumination
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Solution Overview
Problem
Current mobile phone cameras struggle to capture clear images in dark environments due to insufficient brightness and color rendering of existing LED flashes, which are limited by battery capacity and inefficient light directionality.
Innovation Solution
A lighting device with multiple LED chips arranged to surround a light-gathering region, where each chip's side light-emitting surfaces face the central area, enhancing light extraction efficiency by avoiding obstruction and using a fluorescent layer to convert electrical energy into optical energy of different wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LED chips are employed to increase brightness, then luminous intensity is improved, but device complexity and battery consumption increase
Solution Approach 1:
The patent transitions from conventional planar LED arrangements to a three-dimensional configuration where LED chips are positioned at vertices of a tetrahedron or other polyhedra. This spatial arrangement in multiple dimensions allows light emission from multiple directions simultaneously, achieving superior luminous intensity and uniformity without requiring a proportional increase in the number of LED chips, thereby controlling device complexity while improving illumination performance
2Illumination intensity
If LED chips are arranged to face each other, then light directionality is improved, but light extraction efficiency decreases due to mutual obstruction
Solution Approach 1:
The patent applies local quality by orienting each LED chip's light-emitting surface to face a specific direction toward the center of the polyhedral configuration. This localized directional arrangement ensures that light from each chip travels primarily toward the central region without being blocked by adjacent chips, maintaining high light extraction efficiency while achieving the desired directivity of brightness for flash illumination
3Volume of moving object
If conventional LED flash arrangements are used, then device size is reduced, but brightness and color rendering remain insufficient for clear image capture in dark environments
Solution Approach 1:
The patent employs a nested configuration where multiple LED chips are positioned within a compact polyhedral structure (such as a tetrahedron) that fits within the constrained space of mobile phones and portable terminals. The chips are arranged at vertices and/or face centers of the polyhedron, creating a space-efficient nested layout that maximizes light output and color rendering performance while maintaining a small overall device footprint suitable for portable applications
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
This configuration significantly increases luminous intensity by up to 27% compared to conventional arrangements, enabling clearer image capture with improved brightness and color rendering using lower electric power.
Implementation Method 1
using a fluorescent layer to convert electrical energy into optical energy of different wavelengths
Data Source
Figure 1~2B
Figure 3A~4
Figure 5~6
AI summary
A lighting device including a substrate (10), and at least three light emitting elements (11) mounted on the substrate, each having an upper light emitting surface in rectangular shape and side light emitting surfaces in rectangular shape. The light emitting elements are positioned to surround a light-gathering region (12) where the light emitting elements are not located, and one of the side light emitting surfaces of each light emitting element is directed to face approximately a central portion of the light-gathering region.