Flexible Micro-LEDs for Bendable Displays

Display device with encapsulation to prevent impurities and maintain resolution when the display is bent or stretched. The display has a substrate with isolated island sections connected by bridges. Each island has a display element surrounded by organic and inorganic insulating layers. The inorganic layer extends beyond the organic layer on the side. An encapsulation layer covers the display with both organic and inorganic encapsulation materials. This prevents impurities from entering the display when the device is flexed or stretched since the encapsulation layer seals around the display elements. The inorganic insulating layer tip aligns with the inorganic encapsulation layer to maintain seal integrity.

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Flexible displays for electronic devices like smartphones and laptops that can bend and flex along with the device without damaging the display. The displays are designed to overlap the bend axis of the device's hinge, allowing the display to flex and bend with the device without breaking or deforming. This enables electronic devices with bendable or foldable displays that can fully flex without damaging the display component.

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Foldable light-emitting device, display, electronic or lighting device that is both highly portable and highly browsable. The device has alternating strips of high flexibility (containing a flexible light-emitting panel) and low flexibility (containing the light-emitting panel supported by stiff panels). This allows folding and bending the device without damaging the light-emitting panels. The stiff panels provide structural support and prevent the flexible panels from folding beyond their limits.

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Fiber-reinforced rubber composites for positive displacement motor stators that have optimized properties in the transverse cross-section direction. The composites address anisotropy issues caused by fiber alignment during injection molding. The composites have high fiber loading, use high strength fibers, and blend fibrillated and short-length fibers. This allows achieving serviceable modulus across the grain direction while minimizing dispersion agents. The composites have transverse modulus at least 10% lower than longitudinal and >400 psi at 25% strain.

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Generating white noise sequences with equal probability using a digital circuit that produces a sequence with uniform distribution across K distinct values. The circuit implements a digital LFSR (Linear Feedback Shift Register) that generates a sequence with uniform distribution. The circuit's output is a white noise sequence that takes on K different values with equal probability. It achieves this by utilizing the inverse relationship between input and output values in the LFSR, ensuring that the sequence is uniformly distributed across its K values. The circuit's feedback mechanism allows it to generate the next sequence value based on the current sequence and a second input value.

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Flexible display substrate with improved resolution and stretchability when stretched. The substrate has pixel island areas separated by flexible areas covered by isolation structures. The isolation structures have grooves where an elastic packaging part with light reflective material is placed. This compensates for pixel resolution loss when the flexible substrate is stretched due to the elastic packaging part expanding and compressing the light reflective material.

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Display device with reduced border size by bending the display substrate. The display has pixels on a substrate with recesses in an insulating layer above. Conductive layers fill some of the recesses to electrically connect adjacent pixels. The bent substrate shape with recessed insulating layer allows reducing the overall display border width compared to a flat display. The bending radius and thickness of the bent substrate segment are optimized to prevent cracking.

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Display substrate for flexible displays that can conform to curved surfaces like head-mounted displays without pixel distortion. The substrate has a central region and edge region with intersecting long strip shaped through holes. The center hole is larger than the end holes. This allows different stretching amounts in the center vs edges. When the substrate is curved, the edges stretch less than the center, preventing excessive pixel compression in the edges. This reduces edge distortion when attaching the substrate to a curved backplane.

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A flexible display assembly for flexible displays that allows precise bonding of integrated circuits without misalignment. The assembly has a flexible display panel with a stretchable display area, breakable area, and bonding area. Two support films are provided - one on the stretchable area side and one on the bonding area side. The stretchable area support film has greater elongation and lower hardness compared to the bonding area support film. This allows the stretchable area to deform more than the bonding area during bonding, preventing misalignment of contacts and enabling precise bonding of the integrated circuit.

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A backplane design for microLED displays with improved yield by protecting the connecting terminals from oxidation and corrosion. The backplane has the connecting terminals located inside via holes on the flexible substrate instead of exposed on the surface. This prevents environmental degradation and improves reliability. The terminals have portions between the substrate and passivation layer, and inside the via. This allows electrical connection through the via hole to the substrate signal traces. It enables using any material for the terminals, not just ones that can withstand wet etching. The protected terminals improve yield compared to exposed terminals prone to oxidation and corrosion.

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Abstract Stretchable displays are essential components as signal outputs in nextgeneration stretchable electronics, particularly for robotic skin and wearable device technologies. Intrinsicallystretchable patternable color conversion layers (CCLs) offer practical solutions developing fullcolor microlightemitting diode (LED) displays. However, significant challenges remain creating CCLs without backlight leakage under mechanical deformation. Here, a novel material strategy heavymetalfree quantum dot (QD) CCLs, potentially useful electronics is presented. Through versatile crosslinking technique, uniform highconcentration QD loading the elastomeric polydimethylsiloxane matrix loss of optical properties achieved. These demonstrate excellent capabilities with minimal leakage, even 50% tensile strain. Additionally, finepixel patterning process resolutions up to 300 pixels per inch compatible suitable highresolution display applications. The integration these microLED also demonstrated, showcasing their use hapticresponsive healthcare monitoring sensors.... Read More

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Abstract Quasi2D semiconductor nanocrystals, also known as colloidal quantum wells (CQWs), with their high yield in the visible range, ultranarrow emission, and inplane oriented transition dipole moments, provide potentially an excellent platform for flexible lightemitting diodes (fLEDs). In this study, it is proposed demonstrated fLEDs of a single layer facedown CdSe/CdZnS core/hot injection shellgrown CQWs employed emissive monolayer first time. The obtained are shown to be immune large number bending, enabled by use only emitter configuration all being layer. These exhibit maximum external efficiency 14.12%, intense luminance 33 700 cd m 2 , low turnon voltage <2 V, highly saturated red color. Here, orienting these essential efficient charge thanks its extremely roughness increased outcoupling owing dipoles. Therefore, CQW monolayers, properties stable stand out exceptional candidates future advanced display lighting applications well wearables.

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Flexible display device with improved efficiency and simplified manufacturing by using a single-chip light-emitting element that connects multiple pixels together. The display has a stacked light-emitting element with a shared n-type semiconductor layer that connects to a common electrode pad. This allows each pixel's active layer to emit a different color without needing separate electrode pads for each color. The shared n-type layer connects through a conductor to the common electrode pad. This reduces the number of electrode pads and simplifies manufacturing. It also allows using quantum dots in a porous layer to convert the shared blue light to other colors in adjacent pixels.

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Wearable electronic device that can adapt its display to match the user's outfit and environment. The device has a flexible display that can be bent into different shapes. When worn, the device identifies the user's context like clothing, biometrics, and audio. Based on this, it loads a customization theme onto the outward-facing portion of the display while showing regular content on the inner portion. This allows presenting non-informational content like images matching the user's outfit on the visible display region while still showing regular information on the inner region.

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Flexible and stretchable display that minimizes the load of internal lines when the display is stretched. The display has an island-bridge-island structure with separate gate driving, input, and output lines arranged in different layers that overlap. This allows the display to stretch without putting tension on the lines. The output line and connection line from a first island to a second island overlap instead of being side by side. This prevents the lines from separating when the display stretches. Other features like shielding lines and insulating layers are used to maintain electrical connections.

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Flexible and stretchable display that can be rolled, folded, and stretched without damaging the internal components. The display has a substrate with a display area and non-display area. The non-display area has isolated sections for driver circuitry and wiring. The output wiring gradually increases in number as it approaches the display area. This prevents concentration of stress and allows stretching in multiple directions. It also reduces wiring load near the display to maintain image quality.

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Flexible electronic device with bending assistance to improve the reliability and flexibility of bendable displays. The device has a flexible display with an additional layer of assisting patterns between the display layers. The assisting patterns have a pitch different from the display scan and data lines. This creates a bias towards bending in a specific direction while reducing stress in other directions. The pitch ratio of the assisting patterns to display lines is greater than 2 and less than 200. This reduces optical ripple interference and provides better display quality when the device is flexed.

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Bended display device with improved adhesion and durability compared to conventional bended displays. The device has a window with a bending area and a non-bending area. The display module is adhered to the window using an adhesive layer. The adhesive layer has separate portions for the bending and non-bending areas. The bending area adhesive is cured with a photoinitiator that responds to a first light. The non-bending area adhesive is cured with a photoinitiator that responds to a second light with a different wavelength. This allows better adhesion between the bending window and display module sections.

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Reducing dead space in flexible displays to further minimize size and improve efficiency. The display has elements like the active display area, polarization layer, and protective layer extending beyond the display area into the bending region. This prevents delamination and cracking when the display is bent. An adhesive layer between the polarization and protective layers extends into the bend area to improve adhesion. A filling layer fills gaps between layers in the bend area. This reduces dead space by allowing the display to be bent without damaging components or delamination.

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Slidable display device with a flexible display panel and support structure that allows the display to slide and bend without damaging the display. The support structure has a thin plate with lattice patterns covering the display areas and joints protruding from the plate that overlap the bendable areas. The joints have wider bottom surfaces than the top surfaces. This allows the display to slide and bend as the wider bottom surfaces contact first and compress the lattice areas. The narrower top surfaces of the joints prevent obstruction of the lattice patterns during sliding. The thin plate and narrow joint tops reduce bending resistance and thickness.

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