Optical Modules for Micro-LED Displays

LED lamp panel design and manufacturing technique to improve lighting, contrast, and yield while reducing cost. The panel uses a composite circuit layer with reflective layers and window structures to isolate and fill the gap around each LED chip with higher reflectivity material. This captures more light from the chip and prevents absorption by the substrate. The composite layer also allows modulating the light distribution and intensity around the chip. The technique can be used for applications like backlight displays and RGB direct view panels.

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Backlight module for displays with corner brightness compensation structures to improve uniformity and prevent dark corners. The module has a light guide plate, an optical film, and a light guide device. The light guide device extends along one side of the guide plate. It has a portion facing the light source to receive light and another portion at the corner. This guides light from the source to the corner to compensate for lower brightness there.

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Compact, lightweight optical system for imaging devices with reduced size and weight compared to conventional six-element lenses. The system uses a metalens instead of one of the glass lenses. The metalens is made of nanostructured materials and can provide similar optical performance. The metalens is sandwiched between two glass lenses. This allows reducing the overall thickness and weight of the optical system compared to six glass lenses. The metalens can have non-coaxial nanostructures in adjacent layers. The metalens also has an antireflection film.

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Display apparatus with a pixel structure that allows combined light emission and light sensing in each subpixel. The pixel has subpixels, at least one of which has a light-emitting and light-receiving device instead of a regular light-emitting device. This allows the display to emit light and also detect light in the same subpixel. This enables multifunctionality like displaying an image and sensing light simultaneously. The light-emitting and light-receiving device has a structure with electrodes for emitting and sensing light.

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Display device with integrated components in the display area and an opening for other components. The display has a substrate with an opening surrounded by a display area. Grooves are formed between the opening and display using a layer with different etch selectivity compared to the main insulating layer. This allows etching grooves without damaging the display elements. It enables integrating components like sensors or cameras into the display while preventing contamination of the display area.

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Display device with improved image quality and prevention of separated reflective sheets between substrate and lens. The display has a hole in a reflective sheet covering the substrate, with a lens inside the hole. The hole boundary has straight and curved sections. The lens body overlaps an end of a protrusion extending from one of the straight sections into the hole. This catches the protrusion to prevent separation between the reflective sheet and lens during vibrations.

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A light-emitting element transfer stamp and manufacturing method for pickup and placement of micro-LEDs without complex spring structures or high voltages. The stamp has adhesive layers in grooves that protrude above the stamp. This allows selective picking up of micro-LEDs from a growth substrate by adhesion force, then releasing to transfer onto a target substrate. A passivation layer prevents sticking between layers. The stamp material has thermal expansion matching the LED substrate. The stamp has a buffer layer with thermal conductivity between the stamp and a heater wire. This enables local heating for stamp deformation and release of the LEDs. The stamp structure allows micro-LED transfer without complex springs or high voltages.

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Display apparatus with integrated anti-peep and illumination functionality to reduce thickness and improve efficiency compared to adding separate components. The display has a light guide plate with two opposing emitting surfaces. The display panel is on one surface and the other surface reflects illumination light to the panel. Microstructures on the other surface reflect anti-peep light through the panel surface. This integrates the functions on the same plate instead of adding extra components.

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Packaging design for optical interconnects that allows vertical transmission between stacked optical components using integrated lenses and reflectors. The packaging involves bonding optical interposers and optical packages vertically aligned with lenses between them. The reflectors in each interposer are aligned vertically to transmit light between the packages. This enables vertical optical transmission between stacked optical components using integrated lenses and reflectors instead of through-the-substrate techniques.

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Arrangement and method for simplified assembly of compact optoelectronic devices like microLED displays with improved uniformity and reduced tilt. The devices have small-sized semiconductor components with side walls insulated and absorbing to prevent tilt. They are mounted on a carrier with a transparent output element and connected via an insulating layer. The components' contacts are electrically accessed from the rear. This allows easier assembly of small-pitch arrays with uniform radiation and reduced crosstalk. The method involves applying the components, insulation, and output element on a carrier, then connecting the contacts.

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Micro LED display panel design to improve display quality by reducing aberrations and crosstalk between subpixels. The key idea is to surround the LED chip with a symmetrical void in the prism layer. This ensures equal distances between the LED and void in the transverse and oblique directions. The symmetry allows the light rays to reflect identically in both directions, preventing asymmetric focal planes and reducing astigmatism. It also prevents light crosstalk between subpixels by reflecting the rays back into the LED instead of spreading them.

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Light emitting module with reduced stray light on the irradiation surface. The module has a lens over the light source, and a cover over the lens. The cover has three regions: an inner region where light from the lens enters, a middle region around the inner region with higher diffusion, and an outer region. This configuration reduces stray light by having the cover's middle region with higher diffusion surrounding the inner region where light from the lens enters, preventing light from escaping sideways.

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Hybrid lens for compact, lightweight optical systems in electronic devices. The hybrid lens has a traditional glass lens element followed by a metalens made of nanostructured layers. The metalens replaces multiple glass lenses, reducing thickness and weight. The metalens nanostructures focus light. The hybrid lens allows miniaturization and lightweighting of optical systems compared to using multiple glass lenses. The metalens nanostructures can be coaxial or non-coaxial between layers. The metalens can also have an anti-reflection coating. The hybrid lens can be manufactured using nanolithography and etching techniques.

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Micro LED display panel with integrated micro lenses to simplify manufacturing. Each micro LED structure has a first type epitaxial layer, a light emitting layer, and a second type epitaxial layer. The second type epitaxial layer has an integrated structure containing both a micro lens and a bottom layer. This eliminates the need for a separate micro lens manufacturing step.

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An optical laminate with improved light extraction. The laminate has a light extraction layer with recessed areas, covered by two sheets separated by adhesive. The recessed areas form air gaps between the sheets. The laminate also optionally has a thin porous layer between the light extraction layer and the adhesive. The air gaps and porous layer lower the refractive index in certain regions, improving light extraction compared to solid adhesive.

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An optical sensing device that collimates light using a simple structure with reduced manufacturing complexity and cost compared to existing collimating structures. The device has a light-sensing element, a light-shielding layer, an insulating layer, and a light-collecting element. The light-collecting element has a curved shape with a focus distance and a specific refractive index. This configuration collimates light without the need for multi-layer aperture layers or thick organic films. The focus distance and curvature of the collecting element, along with the refractive indices of the element and external medium, are designed to collimate the light.

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Transparent display device with improved resolution and repair capability. The display has sub-pixels containing red, green, and blue LEDs, along with a reserve sub-pixel with stacked red, green, and blue LEDs. If any LED in a normal sub-pixel fails, the reserve LEDs can replace them. Stacking the reserve LEDs reduces area compared to parallel LEDs. The reserve LED electrodes are transparent to allow light from lower LEDs to escape. This allows repair and area savings while maintaining light output.

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Optical stack and backlight design for high dynamic range displays using blue LEDs instead of white backlights. The optical stack reflects blue light with a specific polarization and transmits orthogonal polarization. This allows collimated blue light with low divergence to be used in displays with blue-only backlights. The stack has high reflection in the blue range for one polarization and high transmission for the orthogonal polarization. This preserves blue light while suppressing cross-talk between pixels in blue-only displays. The collimated blue light can be generated by blue LEDs and reduces the need for color filters in the display.

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Camera module for under-display cameras in portable devices that allows normal autofocus operation with reduced light transmission through the display. The module has a fixed lens, a movable image sensor, and a driving unit. This allows the sensor to move for focus without changing the distance to the display. The sensor moves relative to a stationary lens to maintain focus. A separate circuit board between the lens and sensor isolates them. This ensures consistent light entry into the lens regardless of display position during focus.

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MicroLED displays with containers for color conversion materials like quantum dots that have varying diameter profiles along their length. This shape provides better light coupling efficiency compared to cylindrical containers. The containers have a waist section with a smaller diameter than the end faces. This design helps collect more emitted light from the LED into the display's acceptance angle. It balances couplings between LED, quantum dots, microlens, and display acceptance cone for improved overall display performance.

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