Improving Optical Illumination Patterns in LED Lighting

An LED lighting system that provides efficient, glare-free illumination with adjustable color and directionality to replace fluorescent tubes. The system uses multiple LEDs mounted on a transparent support structure. Reflectors redirect light emitted in undesirable directions toward the desired illumination direction. Phosphors on the support structure homogenize the LED colors for a consistent appearance.

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Improving the uniformity of light dispersion from horticulture grow light fixtures to deliver more uniform light across a target area and reduce hotspots. This is achieved by rearranging the positioning of the individual LEDs or light emitters so that a greater density of light emitters is used near the edges of the fixture versus the center. By projecting higher levels of light near the edges it brings more light to the periphery and reduces the difference between edge and center light levels.

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LED filament bulb with omnidirectional light emission and high efficiency. The bulb uses a flexible LED filament shaped to emit uniform light in all directions. The filament has multiple flat segments connected by bendable sections. This allows the filament to be shaped in a non-linear configuration compared to traditional straight filaments. The shaped filament emits light uniformly in 360 degrees. The bendable segments prevent disconnection when the filament is flexed.

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White LED lighting that closely mimics natural sunlight and has improved color rendering compared to traditional LEDs. The device uses broad-spectrum blue LEDs as the excitation source along with optimized green-yellow and red phosphors. The broad blue excitation fills in the cyan trough between blue and green phosphors, boosting color rendering. The result is full-spectrum white light that appears more natural, has higher CRI, and reduces eye damage from excessive blue light exposure.

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LED lamp design to improve color rendering by using a combination of white LEDs and purple LEDs. The purple LEDs emit in the UVA spectrum. The white LEDs provide main light output while the purple LEDs fill in the UVA range. The combined light enhances color rendering compared to just white LEDs. Alternating white and purple LEDs allows overlap of the UVA range. The purple LEDs can be 400-420nm wavelength.

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Lighting device with high color rendering using a combination of blue and purple LEDs. The device has a substrate, blue and purple LEDs on the substrate, and a phosphor-coated transparent housing enclosing the LEDs. The blue and purple LEDs stimulate the phosphor to emit white light with enhanced color rendering. The mixing of blue and purple light allows the white light to partially overlap the UVA spectrum, improving color rendering compared to blue-only LEDs.

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LED lighting device design that improves light output and color consistency over different angles. The design uses a lens assembly mounted over the LED, with a gap between the lens and elastomer encapsulant. This allows light to reflect off the lens surfaces instead of being absorbed by the elastomer. A reflector in the gap can further control light direction. The lens can also have features like a recess or scattering element to mix light. This reduces color variations and improves uniformity compared to traditional LED encapsulation.

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Lighting apparatus with improved luminance using LEDs and reflectors, without increasing thickness or light sources. A reflective unit with a spaced area under each LED increases reflectivity and luminance. The spaced area can be defined by an optical pattern layer to replace a light guide plate.

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Backlight module for displays that uses magnet attraction between adjacent lamp plates to reduce visible gaps. The backlight module includes a back plate, lamp plates, diffuser plates, optical films, and magnetic attraction parts. The lamp plates are magnetically attracted to the back plate to reduce gaps between them when stacked. This improves display quality by minimizing visible seams between lamp plates.

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An electronic lighting device that simulates a flickering flame using a flame sheet that sways like a real flame. The device has an enclosure with a hole in the top, a suspended flame-shaped sheet that extends out through the hole, a light inside the enclosure that shines up through the hole onto the sheet, and a mechanism below the sheet that makes it sway. The projected light on the moving sheet creates a realistic flame effect similar to a candle. The device provides an improved visual experience compared to static LED flame simulations.

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A white light device architecture based on an orange nanowires LED combined with a narrow linewidth blue laser diode for simultaneous illumination and optical wireless communication. The orange nanowires LED provides tunable white light with high color rendering. The blue laser diode enables high-speed data transmission. This hybrid LED/laser system offers improved efficiency, color quality, and data rates compared to conventional phosphor-based white LEDs. The orange nanowires LED has a broad linewidth that fills the spectrum for better color rendering.

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Electronic lighting device simulating true fire with enhanced visual experience compared to previous electronic candles. The device uses a movable flame sheet that is projected upon by an angled light source. The projected light creates the appearance of a flickering flame as the sheet sways, mimicking a real fire.

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Techniques for reducing banding and flickering in videos captured under LED lighting. The techniques involve coordinating the camera and LED lighting parameters to mitigate the interaction between the camera frame rate/integration time and LED PWM frequency. Techniques include using global shutter cameras, adjusting camera parameters, adjusting LED drive signal parameters, and unsynchronized PWM phases between lights.

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A lighting system for plant growth that provides precise control over light color to optimize plant growth. The system uses LEDs of different colors to create tailored light spectra optimized for specific plants and growth stages. A controller adjusts the intensity of each LED color based on external light sensors to mimic natural lighting conditions.

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Low profile LED lighting module with reduced cross-section and improved light uniformity. The module uses primary optics to customize light output from multiple LEDs and a reflective back surface to redirect and blend the light. A secondary diffuser scatters the light for uniform emission. The module has a minimized height-to-width ratio and reduced LED density to balance efficiency and uniformity.

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Quantitative color preference metric called the Lighting Preference Index (LPI) to evaluate and optimize light source spectra for enhanced color preference. The LPI is based on two parameters: the Whiteness of the illumination source and the Color Appearance of objects illuminated by the source. The LPI provides a target value to optimize light source spectra.

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A display apparatus that mitigates bias in light intensity distribution from individual light emitting elements to achieve uniform overall display illumination. The display uses an array of light emitting units, each composed of multiple light emitting elements with different wavelengths. The light emitting elements within each unit are arranged to compensate for their individual intensity biases. This arrangement involves orienting the elements such that their biased intensity distributions align in one direction but cancel out in the orthogonal direction. The overall display intensity distribution is then uniform due to complementary biases.

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LED lighting with optimized color spectrum for enhanced color preference compared to standard LED sources. It uses a metric called Lighting Preference Index (LPI) as a quantitative measure to design light sources with maximum color preference. The optimized composite light sources contain blue, green/yellow-green, and red emitters or downconverters in specific wavelength ranges to achieve LPI of at least 120. These optimized LED spectra provide significantly higher color preference than standard LEDs.

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An eye-safe light source that improves the light emission efficiency while regulating light distribution characteristics. The light source includes a semiconductor laser joined to a substrate with the wire perpendicular to the laser emission direction. The substrate has a curved reflection surface that faces the laser emission end to reflect the laser light. This avoids shadows and scattering bodies between the laser and reflector.

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An electronic lighting device that simulates a flickering flame effect more realistically for applications like electronic candles. It uses a swinging flame sheet and a light source at an angle that projects onto the sheet. The swinging motion of the sheet, along with the light projection, creates a more realistic flame simulation compared to static LED lights.

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