Aspherical LED Lens Double-Peak Illumination Uniformity
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Solution Overview
Problem
Conventional LED lenses with semispherical structures cause uneven illumination in display devices and street lighting due to their symmetrical light emission patterns, leading to bright areas directly under the LEDs and dark areas in between, and they suffer from chromatic aberration issues.
Innovation Solution
An aspherical LED lens with a concavely depressed light exit plane and a conical light entrance plane, featuring a radially symmetrical structure and protrusions on its side surface, which alters the light orientation angle curve to have double peaks on the sides and reduces chromatic aberration by adjusting the light distribution and using a dispersing agent in the lens material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a semispherical LED lens is used, then the light emission structure is simple and easy to manufacture, but the illumination becomes uneven with bright areas directly under LEDs and dark areas in between
Solution Approach 1:
The patent applies asymmetry by transitioning from a symmetrical semispherical lens to an asymmetrical aspherical lens with a double-peak orientation angle curve. The lens profile is specifically designed to emit light with two intensity peaks at different angles, creating a non-uniform angular distribution that results in more uniform illumination patterns on the display panel surface, eliminating the bright-and-dark area problem caused by symmetrical single-peak emission
Solution Approach 2:
The patent changes the optical parameters by modifying the lens surface curvature profile from a simple spherical shape to a complex aspherical profile. This parameter change in the lens geometry transforms the light emission pattern from a single-peak symmetrical distribution to a double-peak asymmetrical distribution, thereby improving illumination uniformity while maintaining manufacturing feasibility through injection molding
2Device complexity
If a semispherical LED lens is used, then the lens structure is simple, but chromatic aberration occurs in the emitted light
Solution Approach 1:
The aspherical lens design with asymmetrical double-peak emission pattern helps reduce chromatic aberration by distributing light across different angular paths, which mitigates the wavelength-dependent focal point separation that occurs in simple spherical lenses. The complex aspherical profile compensates for optical path differences across various wavelengths
Solution Approach 2:
By changing the lens surface profile parameters from spherical to aspherical, the optical path lengths for different wavelengths are adjusted and equalized, reducing chromatic aberration. The specific aspherical coefficients are optimized to minimize wavelength-dependent focal shifts while maintaining the desired double-peak emission pattern
3Device complexity
If LEDs are arranged in a linear pattern with semispherical lenses, then the device structure is simple, but uneven illumination with repeated bright and dark areas is produced on the panel
Solution Approach 1:
The asymmetrical double-peak orientation angle curve of the aspherical lens is specifically designed to counteract the periodic bright-and-dark pattern caused by linear LED arrangement. The two intensity peaks are positioned at angles that fill in the dark regions between adjacent LEDs, creating a more uniform combined illumination pattern across the display panel surface
Solution Approach 2:
The lens design applies local quality by creating different light emission intensities at different angular zones. The double-peak pattern concentrates light in specific angular regions while reducing intensity in others, strategically distributing illumination to achieve overall uniformity when multiple LEDs are arranged in a linear array
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 aspherical LED lens provides uniform illumination in display devices and elongated illumination areas in street lighting, significantly reducing chromatic aberration without compromising light intensity, thus enhancing display quality and lighting efficiency.
Implementation Method 1
An aspherical light emitting diode (LED) lens may include a light exit plane concavely depressed near a central axis, a light entrance plane including a conical plane having a vertex located on the central axis
Implementation Method 2
minimizing chromatic aberration
Data Source
AI summary
An aspherical lens includes a light entrance plane configured to receive light emitted from a light source and a light exit plane configured to radiate the light received by the light entrance plane. The light exit plane includes semispherical convex portions disposed on an upper surface of the aspherical lens, a concavely depressed portion comprising an overlapping region where the semispherical convex portions partially overlap each other at a central axis, a side portion connected with the semispherical convex portions, and an upper surface of each of the semispherical convex portions having a first flat portion.