Gap-Free Illumination via Dual-Array LED Superposition
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Solution Overview
Problem
LED-based illumination devices with multiple light sources arranged in arrays often produce illumination fields with gaps due to light blocking layers and packing constraints, which can result in undesirable comb-like illumination patterns.
Innovation Solution
The illumination device employs two optical systems, each collimating light from a separate linear array of LED light source devices with gaps, such that the partial illumination fields superimpose to form a substantially gap-free illumination field at a predetermined distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If LED light source devices are packed in an array with gaps to facilitate handling and heat management, then heat management is improved, but the illumination field develops gaps creating a comb-like structure
Solution Approach 1:
The illumination device is divided into multiple independent LED light source devices arranged in arrays, each capable of independent control and heat dissipation. This segmentation allows for improved heat management while the collective arrangement creates a continuous illumination field through proper optical design.
Solution Approach 2:
The patent employs optical systems that collimate light in specific directions, transforming the two-dimensional array of LED devices into a one-dimensional beam structure. By controlling the angular distribution of light through optical elements, the illumination field achieves continuity despite the spaced arrangement of individual sources.
2Measurement precision
If light blocking layers are added to lateral surfaces of LED chips to achieve desired contrast, then contrast ratio is improved, but dark surface portions are created between light emitting surfaces
Solution Approach 1:
Light blocking layers are selectively applied only to the lateral surfaces of LED chips where light should be blocked, while the top surface remains transparent for light emission. This localized application of light blocking maintains high contrast ratio for individual LED control while preserving illumination continuity through the array.
Solution Approach 2:
Optical systems act as intermediaries between the LED light source devices and the illumination field. These optical elements (lenses, reflectors) redirect and collimate the light from individual LEDs to fill gaps between them, mediating between the need for individual LED control and the need for continuous illumination.
3Illumination intensity
If optical systems are modified to reduce or remove gaps in the illumination field, then illumination homogeneity is improved, but device complexity and cost increase
Solution Approach 1:
The optical systems in the patent perform multiple functions: they collimate light from individual LEDs, direct the beam in desired directions, and simultaneously fill gaps between adjacent LEDs to create continuous illumination. This multi-functionality reduces the need for additional separate optical elements, thereby limiting complexity increase.
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 achieves a more homogeneous and gap-free illumination field without increasing the complexity of the optical system, thereby improving heat management and maintaining desirable contrast ratios.
Implementation Method 1
a phosphor body covering the LED chip for converting excitation light into illumination light of a predetermined color temperature
Implementation Method 2
light emitted by the plurality of light emitting devices is collimated by optical systems, such that the light from each of the light emitting devices is shaped into a light beam with a narrow cone angle
Data Source
AI summary
An Illumination device includes light emitting devices and an optical system for collimating light emitted by the light emitting devices. A first group of the light emitting devices are arranged in a first array having first gaps, and a first optical system is arranged near the first group of light emitting devices. At least one second group of the light emitting devices are arranged in a second array, and the second array has second gaps. The second optical system is arranged near the second group of light emitting devices. The first and second optical systems are arranged so that, in a distance from the illumination device, light emitted by the first group of light emitting devices, collimated by the first optical system, and light emitted by the second group of light emitting devices, collimated by the second optical system, are superimposed to form a gap-free illumination field.