Screen Door Effect Elimination in Micro-LED Displays

Micro LED display panel with improved resolution, reduced screen door effect, and lower cost compared to conventional micro LED displays. The panel has an array of sub-pixel areas on the substrate, each filled with uniformly distributed micro LEDs. This allows higher resolution by packing more LEDs in each sub-pixel without increasing inter-pixel gaps. By optimizing the number of LEDs per sub-pixel, it balances resolution, screen door effect, and cost compared to using a single large LED per sub-pixel. The micro LEDs are transferred using a process like micro transfer printing.

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Display device structure to improve external light reflection and light emission efficiency. It uses a light structure with a light transmitting portion, light shielding portion, and reflective portion. The light transmitting portion has a scatterer like particles in a resin to scatter light. The shielding portion has openings for emitted light. The reflective portion between them reflects scattered light. This configuration reduces external light reflection loss and increases internal light emission efficiency by scattering and redirecting light. The openings in the shielding and reflective portions allow light to pass through. The overall shape is similar to an integrating sphere for reflecting scattered light.

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Display device with improved light extraction efficiency and display quality by reducing internal reflections. The display has a stacked structure with a substrate, transistor, light emitting element, encapsulation layer, sensing electrode, and insulating layers. The insulating layers have progressively increasing refractive indices from the bottom to the top. This graded index structure helps light rays escape the device by reducing total internal reflections at the interfaces between layers.

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Connecting substrate for splicing multiple smaller display panels into a larger display, with reduced inter-panel spacing to eliminate dark lines. The connecting substrate has connecting areas between adjacent panel areas, with electrodes and wiring to connect the panels. The electrodes are inserted through holes in an insulating layer to reach the panel pads. This allows the panels to be directly connected without external wiring, minimizing gap between panels.

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The quantum efficiency of micro-light emitting diodes (micro-LEDs) is lower than that large area LEDs. This reduction typically attributed to the nonradiative ShockleyReadHall recombination at surface defects and current leakage through sidewall region without a clear distinction between these effects. In this work, we attempt find out which phenomena most critical for reduced micro-LEDs. has been done by mapping electroluminescence (EL) photoluminescence (PL) measuring PL dynamics in blue GaN micro-LEDs fabricated dry etching. It found as-etched device, EL intensity much devices with KOH etching atomic layer deposition SiO2. effect especially pronounced close sidewalls. On other hand, decay times are similar passivated devices, both their center allows concluding main mechanism not recombination. be efficient means eliminate leakage.

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Display panel design to reduce resistance differences between fanout wires to improve display quality. The panel has a fanout area with multiple fanout wire portions. Wires in each fanout wire portion have groups arranged from the middle to the boundary. The width of the wire closest to the boundary is larger than the wire closest to the boundary in other fanout wire portions. This reduces resistance differences between fanout wires. The width differences are equalized within each group. Larger widths near the boundary compensate for increased resistance there.

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Light-emitting display device that uses a foam layer to effectively utilize light from a light source while simplifying the component configuration. The display has a base material with the light source, a foam layer that transmits and diffuses the light, and optionally a skin layer and printed layers. The foam has a portion of the light source embedded. This allows light emitted by the source to be transmitted and diffused by the foam instead of directly through the base. This reduces wasted light and improves efficiency compared to a base-only display. The foam can be stretched to increase light transmission. The display can be flexible and 3D-shaped.

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Display device with improved emission efficiency by optimizing electrode and layer stacking in the emission structure. The device has a first electrode, pixel defining layer, separation layer, emission structure, and second electrode. The separation layer has two widths, with a wider region between the pixel defining layer and emission structure. The emission structure has layers with thicknesses, with a thinner layer near the pixel defining layer and thicker layer further from it. This configuration helps contain the emitted light and prevent it from leaking back into the device, increasing overall efficiency.

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Display substrate with improved design for flexible displays that have under-display cameras. The substrate has multiple pixel circuits, light emitting elements, and data lines in a surround region around a central display area. This allows data connections between the surround pixels without wires in the central display region. It prevents visual artifacts from wiring in the central display area while maintaining data connectivity.

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Display device that can selectively control viewing angles in specific areas. The display has pixels with customized light emission and lens configurations to provide different viewing angles. Pixels in some areas have additional emission areas with half-cylindrical lenses for narrow viewing angles, while pixels in adjacent areas have regular emission areas with half-spherical lenses for wide viewing angles. This allows selective activation of narrow or wide viewing angles in certain areas while maintaining wide viewing in others. The customized pixels and lenses prevent boundary artifacts between areas with different viewing angles.

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Flip-chip mounted monolithic micro LED display element with improved contrast. The element has a substrate, n-type, light-emitting, and p-type layers. Each light-emitting part has a first electrode on the p-type layer. An absorbing structure is above the first electrode with alternating dielectric and metal layers. A through hole connects the absorbing structure to a second electrode above. This prevents light transmission between pixels and reduces reflection/contrast loss.

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A display substrate design with improved contrast, light mixing reduction, and device fixation for microLED displays. The display substrate has a first light dimming layer between groups of microLEDs that absorbs external light and emitted light to improve contrast and prevent light mixing. A first fixing layer on the microLED side absorbs light and fixes the microLEDs to prevent falling. The light dimming and fixing layers are formed using inkjet printing.

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Color conversion substrate for displays that prevents or reduces side light leakage. The substrate has a base with display area and peripheral area. A color filter is in the display area. A front light blocking member with overlapping colored layers is in the peripheral area. A side light blocking member outside the front member surrounds it. The side blocking member has overlapping colored layers. This effectively traps light from the front blocking member to prevent side light leakage.

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Display device with reduced manufacturing cost by concurrently forming the partition wall and bank during fabrication. The display has a substrate, a partition wall defining an opening, a bank around the opening, electrodes on the opening and bank, and a light emitting element inside. The bank and partition wall are integrally formed. This allows trapping the coating solution containing the light emitting elements during deposition. Simultaneously forming the partition wall and bank reduces manufacturing steps compared to sequential fabrication.

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Display device with reduced light reflection from transmission areas to improve image quality. The display has a substrate with grooves corresponding to the transmission areas. This reduces diffraction and reflection of light passing through the transmission areas compared to a plain substrate. The grooves can have varying widths to constructively interfere with light passing through protrusions on the substrate. This constructive interference reduces light loss as it travels from the display elements to the substrate and back.

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Display device with improved light extraction efficiency and display quality by optimizing the internal structure around the pixels. The display has multiple color subpixels (RGB) on a substrate. Insulation layers are stacked above the subpixels. The lower insulation layer has openings overlapping some subpixels. A higher refractive index upper insulation layer is filled in these openings. This prevents light reflection at the interface between the two insulation layers. The openings are placed strategically to avoid overlapping some subpixels. This prevents light trapping when exiting the display. By selectively modifying the insulation layer stack around some subpixels, overall light extraction is increased while preserving color accuracy.

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MicroLED structure and chip design that enables efficient manufacturing of microLED displays with reduced yield loss and improved uniformity. The microLED design involves extending the active light emitting layer beyond the edges of the top and bottom electrodes. This prevents the active layer from being completely covered by the electrodes, allowing the emitted light to spread out horizontally. The electrode edges align vertically to maintain contact, but the active layer extends laterally. This prevents light confinement and improves extraction efficiency. Sharing the active layer between multiple microLEDs also reduces variations in material quality and thickness. Isolation structures between microLEDs can be formed in the shared active layer to prevent light crosstalk.

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Solid state lighting apparatus with reduced reflection and improved contrast for displays and lighting applications. The lighting apparatus uses a black or dark encapsulation layer surrounding the LEDs to minimize reflection of ambient light and external sources. This helps improve contrast and visibility, especially in daylight conditions, by limiting the reflection around the LED chip(s). The encapsulation layer is coplanar with the LED surface by at least 25 microns to achieve the reduced reflection.

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Light-emitting device with improved luminance and reduced unevenness when multiple LEDs are arranged. The device uses an array of LEDs, transparent members, and electrodes. The LEDs have a light-extracting surface. The transparent members have a lower surface facing some LEDs. A covering surrounds the LEDs. The electrodes are below. They connect to LEDs in columns and have alternating polarity. This configuration allows some LEDs to emit light through the transparent members while others are covered. The alternating polarity prevents adjacent LEDs from emitting simultaneously. This reduces unevenness compared to uncoordinated LEDs. The transparent members and covering improve overall luminance.

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Reducing non-uniformity of luminance between light sources and areas between light sources on the light emitting surface of a direct backlight for liquid crystal displays, despite further progress in reducing the thickness of the backlight. The backlight uses an optical sheet with controlled unevenness. The optical sheet has a surface with microscopic projections and recesses. The sheet is placed between the light sources and the display. The projections promote multiple reflections of light between the sources and sheet, reducing luminance variation compared to a smooth sheet. The sheet is designed so that at least 30% of the microscopic regions have surfaces with inclination angles of 30 degrees or more when approximated as flat. This promotes reflection and reduces luminance variation with reduced distance between sources.

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