Light Extraction Enhancement in LED Systems

Light-emitting device with improved light extraction efficiency by using a structured light extraction layer. The device has a light-emitting structure with a light-emitting functional layer, and a first light extraction layer on the light-emitting side. The first layer has an irregular brush-like micro-nano structure on its extraction surface. This structure changes the reflection and refraction conditions to extract more light. Optionally, a second layer with different refractive index is added. The device can also have a light extraction mesh film with sponge holes. The structured light extraction layers increase light extraction efficiency compared to flat layers.

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Micro LED display technology with improved light extraction for higher brightness and efficiency. The micro LEDs have non-vertical sidewalls, angled to direct light out of the device instead of internal reflection. They also use features like mirrors, low refractive index layers, and optical isolation to enhance extraction. This involves modeling light interactions using wave optics and ray tracing to optimize designs.

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Preparing an organic light-emitting diode (OLED) display panel with improved light extraction efficiency. The panel includes a glass substrate with a buffering layer of silicon dioxide (SiO2) nanoparticles between the substrate and the anode. This prevents water vapor penetration that can cause display issues. The OLED structure has a first light extraction layer formed by selectively depositing SiO2 nanoparticles on the substrate protrusions. This rough interface improves light scattering. The OLED also has a second light extraction layer containing silver (Ag) nanoparticles to further enhance light extraction.

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An adjustable lighting fixture that maintains high light output even when angled. The fixture has an adjustment module that slides horizontally as it tilts to keep the center of the light beam pointed at the ceiling opening. This allows the module to be tilted without blocking part of the light cone. The module pivots on spring-loaded brackets that hold it in position. The brackets also act as sway bars to guide the module's motion and counterbalance its weight.

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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 the 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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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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A hybrid LED with improved light extraction efficiency by combining OLED, lateral light source, and refractive index matching. The LED has an OLED, a first refractive index matching layer, a light guide plate, a second refractive index matching layer, and a side light source. The refractive indices of the matching layers are arranged to match and refract light at large angles. This increases overall light extraction compared to conventional LEDs. The OLED-based hybrid LED can also be used as a white light source without color mixing.

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A light control member for display devices that reduces external light reflection and improves light scattering properties for better display quality. The member contains a phase-separated layer with separate regions for light conversion, base resin, and a region with only the base resin. The light conversion regions have quantum dots with bound liquid crystal ligands. This allows effective separation of the conversion regions from the base resin, improving conversion efficiency and reducing reflection. The bound ligands also enhance light scattering. The separated regions enable phase separation and controlled arrangement to optimize conversion and extraction efficiency.

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A light extraction substrate for organic light-emitting diodes (OLEDs) that dramatically improves light extraction efficiency compared to conventional OLED substrates. The light extraction substrate has a base substrate with a light scattering layer containing pores. A thin flattening layer with a lower refractive index than the scattering layer is formed on top. The pore diameter is 350-450 nm, the pore area is at least 40% of the base substrate area, and the flattening layer thickness is 200 nm or less. This design optimizes light scattering and refractive index matching to extract more light from the OLED device.

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Method for improving light extraction efficiency of organic light-emitting diodes (OLEDs) by using conductive polymer-based structures to extract light from the active OLED area. The method involves depositing a conductive polymer layer with a refractive index matched to the OLED material on the OLED substrate. This layer acts as a transparent electrode and also helps extract light by reducing internal reflection. The matched refractive index prevents total internal reflection at the interface between the OLED and electrode layers. This allows more light to escape the OLED and be emitted into the surroundings.

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A light extraction member for improving light output efficiency in lighting devices and displays. The member has a light guide part with a specific patterned emission control layer on one surface. The control layer has a lower refractive index than the guide part. The layer contains microporous particles bonded together in a porous structure. The porous structure allows light extraction through the control layer while preventing light reflection back into the guide. The layer's lower refractive index compared to the guide reduces total internal reflection.

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A white LED structure with improved light extraction efficiency and color conversion efficiency. The structure involves a white LED with a wavelength conversion layer and a specific contact layer design. The white LED emits light of a first wavelength. The wavelength conversion layer converts some of the emitted light into light of a second wavelength. The LED contact layer has higher reflectance for the converted light wavelengths compared to the emitted wavelength. This increases the reflected light back into the LED, improving overall light extraction efficiency.

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Light extraction layer for improving light output efficiency of LEDs and OLEDs. The light extraction layer contains a scattering layer made of a base material and scattering particles with a refractive index different from the base material. The scattering layer has scatterance of 0.30 to 2.85 and yellow index of 1.40 to 16.00. This range of scattering and yellow index values in the scattering layer improves light extraction efficiency from the LED/OLED device.

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Light extraction layer design for improving light efficiency in light-emitting devices like OLED displays and LEDs. The light extraction layer contains a scattering layer made of a base material with scattering particles having a different refractive index. The thickness A and particle volume concentration B of the scattering layer satisfy a specific relationship along with the yellow index C. This configuration optimizes light extraction efficiency from the light-emitting layer.

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A light extraction substrate for organic light emitting devices (OLEDs) that extracts more light from the devices and improves overall efficiency. The light extraction substrate has a base substrate with a light scattering layer on top. The scattering layer contains BaTiO3 particles dispersed in a matrix. The BaTiO3 particles have low absorption in the blue-green spectrum. They scatter light to extract more of the internally generated light. The matrix layer has low absorption in the same spectrum. The scattering layer thickness is at least twice the particle size. This configuration reduces absorption of internally scattered light.

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Electroluminescent display device with improved light extraction efficiency and viewing angle. The device has a reflective electrode with protrusions underneath a light-emitting region. The protrusions have openings exposing their tops. This creates a structured reflective layer that enhances light extrusion compared to a flat reflective layer. The protrusions also scatter light internally for better viewing angles. The structured reflective layer is formed by spaced metal patterns beneath it. The protrusions' openings expose the metal patterns' tops. The metal patterns' shape with inclined surfaces helps light extraction.

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