LED Array with Integral Lens System for Compact Illumination
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Solution Overview
Problem
Conventional light emitting diode (LED) devices face challenges in achieving sufficient light on target, particularly in compact applications like cell phone camera flashes, due to space constraints and inefficient light distribution.
Innovation Solution
A light emitting device with multiple LED dies mounted on a shared submount covered by a single integral lens system, where each LED die is separated by a sufficient distance to allow individual lens elements to focus light effectively, optimizing light distribution and alignment for enhanced illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple LED dies are mounted close together on a common submount, then the device size is reduced, but the light distribution and focusing capability deteriorates
Solution Approach 1:
The lens system is segmented into multiple individual lens elements, with each lens element positioned over a corresponding LED die. This segmentation allows each lens element to independently focus light from its associated LED die, maintaining effective light distribution even when multiple LEDs are mounted in a compact arrangement on the common submount.
2Illumination intensity
If a single integral lens system with multiple lens elements is used, then light focusing and distribution is improved, but the device complexity increases
Solution Approach 1:
Multiple individual lens elements are merged into a single integral lens system that is positioned over the common submount. This merging approach provides several advantages: it simplifies alignment (the entire lens system can be positioned as one unit), reduces the number of separate components, and maintains effective light focusing from multiple LED dies while controlling overall device complexity.
3Area of stationary object
If lens elements are positioned close together, then the device footprint is reduced, but the ability to separate and focus individual LED light sources deteriorates
Solution Approach 1:
The lens elements are arranged in a planar configuration on the lens system that corresponds to the arrangement of LED dies on the submount. This dimensional correspondence allows the lens system to be aligned with the LED array in a straightforward manner, maintaining effective focusing capability while controlling the device footprint through optimized spacing and arrangement of the lens elements.
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 increases light efficiency by 15% to 45% compared to systems with a single lens element, enabling effective illumination in limited spaces while allowing for improved heat dissipation and increased current driving capabilities.
Implementation Method 1
each of the lens elements to focus the light emitted from the light emitting diode dies on a desired target
Implementation Method 2
a number of light emitting diode dies mounted on a shared submount
Implementation Method 3
light emitting diode (LED) devices
Data Source
Figure 1~4
Figure 5A~7
AI summary
A light emitting device includes a number of light emitting diode dies (LEDs) mounted on a shared submount and covered with a single lens element that includes a corresponding number of lens elements. The LEDs are separated from each other by a distance that is sufficient for lens element to include separate lens elements for each LED. The separation of the LEDs and lens elements may be configured to produce a desired amount of light on a target at a predefined distance. In one embodiment, the lens elements are approximately flat type lens elements, such as Fresnel, TIR, diflractive lens, photonic crystal type lenses, prism, or reflective lens.