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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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 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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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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Micro LED with improved efficiency and beam profile by using a mesa-shaped semiconductor layer, antireflection film, refractive index matching material, and reflector layer. The mesa shape concentrates light emission. The antireflection film reduces reflection. The matching material matches the refractive index of the surrounding environment. The reflector layer redirects light back into the LED. This setup extracts more light and collimates the beam compared to a planar LED.

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Integrated periodic micro-concave mirror composite light extraction structure for improving the light extraction efficiency of optoelectronic devices like OLED displays. The structure involves arranging micro-concave mirrors on the device surface, with nano-rings on the concave walls, nano-columns at the center, and a reflective layer on the device substrate. This reduces total internal reflection and allows more light to escape. The micro-concave mirrors, nano-rings, and reflective layer enable multiple light extraction mechanisms like direct emission, curved surface exit, sidewall exit, back reflection reuse, and pillar emission.

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Grating organic light-emitting diodes (OLEDs) with enhanced light extraction efficiency. The grating structure is formed between the substrate and the first electrode to extract light from the substrate mode and waveguided mode in the OLED. A low-refractive-index layer is inserted between the substrate and the first electrode to increase the refractive index contrast and improve extraction of the waveguided mode. This provides higher overall light extraction efficiency compared to OLEDs without the grating and low-index layer.

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Both-side light-emitting lighting device with high extraction efficiency and improved power efficiency. The device has a light-emitting device between two surfaces, one emitting light in one direction and the other in the opposite direction. A scattering light extraction film is on one surface. The film has a base material with pores and surfaces that scatter light differently. By optimizing the pore scattering vs surface scattering balance, it extracts more light from the emitting device while maintaining power efficiency.

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Light extraction module for organic light-emitting diodes (OLEDs) to improve light extraction efficiency from OLEDs with top emission, such as display panels. The module comprises two refractive layers with different refractive indices. One layer is close to the OLED cathode and the other is farther away. The higher refractive index layer near the cathode extracts light from the OLED surface. The lower refractive index layer further away transmits the extracted light out of the device.

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A light-emitting device with improved color uniformity for displays. The device has a light extraction layer surrounding the light-emitting layer to enhance light extraction efficiency. The layers are stacked and bonded together to prevent air gaps between them. This prevents contaminants like dust and moisture from entering the light-emitting layer and affecting its performance.

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Light-emitting diode (LED) design to enhance light extraction efficiency for applications like projectors. The LED structure has a reflective polarizing layer on the light-emitting side. The polarizing layer emits light in a single vertical direction while reflecting other directions. The reflected light is scattered and decomposed into vertical directions by a diffuse reflection part. This repeated use of light and scattering reduces loss compared to direct emission. The design also involves a bracket with a reflective layer and packaging material around the LED chip.

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