Consistent LED Lighting Solutions for Multi-Device Systems

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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LED package with adjustable color appearance and electronic device using it, where the LED package matches the device color when not emitting light. The package has an electrochromic film that changes from a colored opaque state to a transparent when voltage is applied. A reflective layer and color layer also give the LED chip a different color when off. In an electronic device, the LED package color can be matched to the device's appearance when not emitting light to have a coordinated look.

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Light emitting diode (LED) array with a window that shapes and focuses the light in a way that minimizes variations in intensity across the beam angle. The LED array has a matrix of closely spaced LED chips on a substrate. A dome-shaped window covers the LEDs and controls their emitted light paths. The window has a convex lens shape with a height of 70% or less than its lower diameter. This concentrates the light within a 90-degree beam angle while reducing peaks and valleys in the light profile.

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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 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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Precisely controlling a multi-color LED light source to generate white light with tunable color temperature. The method involves operating the LEDs in continuous wave mode and not pulse width modulation. Each LED is run at least 5% of max current to prevent undercurrent. The LEDs emit blue, bluish-white, greenish-white, and red light. These are mixed to generate white light with adjustable correlated color temperature.

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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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Low-profile LED lighting module with reduced cross-section and improved light uniformity. The module uses primary optics to customize the 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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A light-emitting module and lighting fixture design that reduces color unevenness in sealed LED packages using a thin-film layer. The module has a substrate with a thin-film layer above it that has lower wettability than the substrate. The LED is mounted on the substrate under the thin-film layer, and a thick layer of phosphor-containing sealant is applied over the LED. The thin-film layer prevents the sealant from flowing towards the LED during curing, reducing color variation from path length differences through the phosphor.

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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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Light source module that utilizes a secondary set of LEDs to disperse low leaking currents in order to prevent abnormal light emission. The module has multiple first LEDs connected to a power input terminal, with second LEDs connected to the outputs of the first LEDs. The second LEDs are interspersed between the first LEDs to disperse low currents and prevent abnormal lighting from a non-normal power source.

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A controlled linear LED light source for sorting machines that enhances imaging capability and sorting performance. The light source uses a modular LED illuminator with individual LED control that allows temporal, spatial, and spectral control of the light emitted. An external diffuser renders the light uniform. A computer network controls the LEDs to generate a multi-modal, multi-spectral light output with characteristics optimized for imaging and sorting.

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LED light emitting device that combines multiple LED sources into a compact high quality light source. The device uses a single light guide element adjacent to the LED output surfaces to efficiently collect the emitted light and guide it to an output surface. A transparent collimating element captures the guided light and reflects any escaping light back into the guide.

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A socket assembly to hold an LED package securely for lighting applications without causing LED package failure. The assembly includes a base frame, isolator frame and electrical contact. The base frame attaches to a support structure and has a spring finger that applies a clamping force to the LED PCB. The isolator frame isolates the electrical contact from the base frame. This allows the spring finger to clamp the LED PCB against the support structure without applying excessive force that could fracture the LED package.

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LED module with customized connection of series parallel circuits to achieve uniform thermal loading of LEDs for optimum heat dissipation and reliability. The number of LEDs in the parallel circuits is varied based on their position on the circuit board. Fewer LEDs are connected in parallel in the central region compared to the edge regions. This reduces the current and heat in the center where cooling is poorer.

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Lighting device with improved heat dissipation to protect LEDs and maintain stable output. The device has a heat sink made of materials like sintered silicon carbide that can withstand high temperatures and conduct heat away from the LEDs. This prevents over-heating and color shifting that degrades LED performance. The heat sink can have sections of different materials to optimize heat transfer.

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A white light device architecture suitable for illumination and optical wireless communications. The architecture uses an orange nanowires LED combined with a blue laser diode. This achieves both high quality white light generation and high speed optical communications in a single device. The orange nanowires LED provides tunable color rendering with a high CRI, while the blue laser enables optical wireless data transmission.

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A light emitting module with groups of differently colored LEDs arranged in a specific pattern on a circuit board to improve color rendition, color control, and heat distribution. Groups of red LEDs are positioned on the outer circumference, followed by groups of green LEDs, and then groups of blue LEDs in the center. The red LEDs are connected in series, followed by the green and blue LEDs. The number of each type of LED increases as the wavelength decreases. The circuit board has wider traces for the red LED connections.

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LED lighting with high color rendering index (CRI) and adjustable color temperature. The LED array contains multiple strings, each comprising several LED chips of potentially different wavelengths, with each string controlled electronically as a separate channel. Phosphors of multiple types and emissions spectra are dispensed or applied on top of all of the individual LED chips, such that it is possible to have a different phosphor type on each individual LED chip, or on different subsets of the LED chips. The multiple channels allow for each string of LEDs and hence their output color and power to be independently switched on/off and varied in intensity, respectively. This allows the LED illuminator to provide variable or adjustable color temperature (CCT), while maintaining extremely high CRI.

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LED luminaire with improved color mixing and uniformity by dispersing the colored LED elements within the array to provide a uniform color output. This overcomes issues like visible color banding, non-homogeneous illumination and poor color mixing of regular patterns. The dispersed arrangement allows creating larger luminaires by replicating a base module of colored LEDs because replicating square base modules maintains the uniformity.

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