Textured Lens Reduces Color Banding in LED Lighting
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Solution Overview
Problem
LED-based lighting fixtures often experience color banding and shadows due to light being cut off by reflectors and uncontrolled light emission from multiple die LEDs, leading to undesirable peripheral light patterns.
Innovation Solution
A textured lens with a combination of a substantially texture-free portion and a textured portion is implemented across the light output opening of the lighting fixture, where the textured portion transitions from a light to a heavy texture, scattering light rays to minimize color banding and shadows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflector is used to direct light output from multiple LED dies, then light directionality is improved, but color banding and color shadows occur at the beam edge
Solution Approach 1:
The lens is divided into a textured portion and a substantially texture-free portion, where each portion has different surface properties. The textured portion scatters light to eliminate color banding at the beam edge, while the texture-free portion maintains the main beam's directional intensity, creating local quality differentiation to resolve the contradiction.
2Productivity
If multiple LED dies are used in a lighting fixture, then lighting efficiency and color capability are improved, but uncontrolled light emission causes peripheral streaks and color banding
Solution Approach 1:
Different portions of the lens are assigned different functions: the textured portion handles scattered light from multiple LED dies to prevent peripheral streaks, while the texture-free portion allows controlled light transmission for the main beam, thereby resolving the issue of uncontrolled light emission while preserving lighting efficiency.
Solution Approach 2:
The lens is segmented into distinct functional zones (textured and texture-free portions) that separately manage light from different LED dies, preventing the harmful effects of uncontrolled light emission while maintaining the productivity benefits of using multiple LED dies.
3Stability of the object's composition
If a textured lens is used to reduce color banding, then light uniformity is improved, but beam angle and intensity may be altered
Solution Approach 1:
The lens applies texturing only to the portion of light that would otherwise create color banding, while leaving the main beam path unaffected. This localized approach improves light uniformity by eliminating color banding without significantly altering the main beam's angle or intensity characteristics.
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 textured lens effectively reduces color banding and shadows by scattering light rays, ensuring a more uniform and desirable light output pattern without noticeable intensity changes or beam angle alterations.
Implementation Method 1
the textured portion transitions from a light to a heavy texture, scattering light rays to minimize color banding and shadows
Data Source
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AI summary
Methods and apparatus related to a textured lens(30, 130). The textured lens includes a textured portion(40, 140)having plurality of unique textures. The lens may be utilized in a LED-based lighting fixture (10, 110) to, for example,reduce the presence of color banding and/or color shadows present in the light output of the lighting fixture. The textured portion may extend across all or portions of the lens surface.