Micro-LED Display Repair

Contactless micro LED inspection system that uses pulsed lasers to detect defective micro LEDs without direct electrical testing. The system emits pulsed lasers at the LEDs to generate photovoltaic radio frequency signals when radiated. An antenna receives these signals, which are amplified and analyzed by a processor to determine if the LED is functioning or defective. This allows high-efficiency, contactless testing of micro LED arrays without needing to electrically test each individual tiny LED.

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Display device with improved brightness uniformity, reduced staining, and higher charging efficiency at low brightness levels. The display has a bank layer surrounding the LED areas. The bank layer thickness varies between areas. A thinner bank area adjacent to the LEDs prevents residual films in the micro-lenses. A thicker bank area away from LEDs absorbs laser repair beams to block current. This prevents visual artifacts when repairing defective subpixels without affecting adjacent subpixels. The varying bank layer thicknesses balance brightness, staining, and repair isolation.

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A composite integrated film for high-resolution displays like microLEDs that allows eliminating defects and increasing pixel density. The composite integrated film has a base member thin film with penetrations, electrodes on one side, and an element on the other side. When bonded to a circuit board, the base member contacts the board first. This allows testing and separating the element side without damaging the circuit board electrodes. The penetrations connect the electrodes and element sides. By bonding the base member to the board first, defective elements can be removed and replaced without reworking the circuit board. This enables higher yield and pixel density compared to flip-chip bonding where board electrode damage prevents rework.

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Transparent display substrate with improved electrical connectivity and repairability. The display has a scanning line with outer ring portions extending from the non-display area into the display area. This reduces the scanning line resistance and allows shorted sections to be isolated. The data and power lines also extend into the display area to overlap the scanning lines. This allows repair of failed pixels in the display region by cutting off shorted lines. The outer ring portions also connect to the scanning lines to provide redundancy. The ring portions can have different configurations like closed loops or branches.

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Repair method for display panels that allows selective replacement of defective components in subpixels to improve yield and reduce repair costs. The repair involves electrically separating the cathode connections of adjacent subpixels, then connecting the cathode lines of those subpixels. This allows individual subpixel replacement without affecting the rest of the display. By isolating faulty subpixels and connecting good ones, repair processing can be optimized for each defect state. The repaired subpixels are then compensated for luminance to match the original display. This enables targeted repair of subpixel components without affecting the rest of the display, improving yield and reducing repair costs.

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Display device with a stacked transparent repair substrate to easily and cost-effectively repair defective micro LEDs in a display. The device has a base substrate with the main micro LEDs and a transparent repair substrate stacked on top. The repair substrate contains replacement micro LEDs at positions corresponding to defective LEDs on the base substrate. This allows repairing defects without removing and replacing individual micro LEDs on the base substrate.

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Light emitting display with test pixel to diagnose display defects. The display has areas for showing images and transmitting light. Each image pixel has a connected test pixel in the transparent area. If a regular pixel is defective, the test pixel shows the issue is the pixel device or circuit. This allows targeted repair versus replacing whole pixels.

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Display device with LEDs that improves luminance and allows individual LED replacement. The display has a display board with LEDs supported by it. The LEDs are electrically connected through an electrode body. The LEDs have a peak wavelength difference of 5 nm or less. This allows them to appear as a single light source when illuminated. The LEDs have a light transmitting layer with a ragged region formed on the side facing the LEDs. This allows light refraction and improves luminance. The LED electrodes are connected to separate electrodes on the display board. This allows individual LED replacement. The display can also have markers with exposed LED electrodes and light emitter holes of different sizes or spacing to reveal specific LEDs.

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A method for repairing flexible transparent LED displays without having to replace the entire display if faulty components are found. The method involves softening the encapsulation layer surrounding the faulty component, accessing and repairing the component, then curing the softened encapsulation layer. The softening is done by heating the display to a temperature that melts the encapsulation material but avoids damaging other components. This allows repairing individual faulty components in flexible transparent LED displays without needing to replace the entire display.

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Display panel with improved optical performance, reliability and production yield, using a cluster-based approach. The panel is built by connecting clusters of LEDs on interposers using hub boards. Each cluster is a self-contained unit with LEDs, driver IC, and encapsulation. This allows replacing defective clusters instead of individual LEDs or whole panels. The encapsulation protects against moisture and contamination. The clusters are manufactured using techniques like overmolding to form light-shielding layers.

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Method for manufacturing micro LED displays with high yield and low cost after transferring the micro LEDs from the growth substrate. The method involves repairing defective or missing micro LEDs by filling vacancies or replacing failed micro LEDs in some areas, rather than retransferring the entire display. This allows using the original substrate with intact micro LEDs alongside repaired areas. The repaired micro LEDs have their own substrate, electrical connections, and pins. The connections between the repaired and original areas use solder, glue, wire bonding, or PCB pads. This avoids retransfer issues and reduces cost compared to replacing all defective micro LEDs.

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Maintenance method for Mini/Micro LED integrated package display devices to repair defective pixels without compromising reliability and adding a matte surface finish. The method involves replacing the failed LED chip, partially filling the repair area with regular resin and curing, then completely filling and curing with modified resin containing boron trifluoride-monoethylamine. The modified resin cures faster internally compared to the surface, creating stress that causes an orange peel texture for a matte finish.

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LED display panel with consistent packaging surface and method for preparing and maintaining it. The panel has a glossy outer layer over the encapsulation layer. This glossy layer is formed by molding with a glossy release film. The glossy layer is then treated and coated with a thermosetting anti-glare coating. This provides a consistent surface without pattern issues. To maintain consistency during repairs, the damaged area is dug out, filled, and polished to match the surrounding encapsulation level. Then the treated area is coated with anti-glare coating and cured. This prevents a visible repair seam with inconsistent light emission.

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Method for inspecting and repairing micro LED displays to reduce rework and improve yield. The method involves using a probe card with micro spring tips to test micro LEDs after transfer. Defective pixels are identified by EL inspection. Replacement micro LEDs are mounted using a stamping process. This avoids rework issues that can occur with traditional repair methods.

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Display unit with improved repairability and a method to repair it. The display unit has cutting lines around the edge with identification points. This allows precise machine processing of excess material during repairs. The identification points cover the edges around the display circuitry. By cutting along these lines, excess encapsulation can be removed without affecting the functional area. The width of the cuts is greater than 200um. This allows accurate secondary processing after removing and replacing faulty components. It avoids issues like misalignment or overcutting when reworked.

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Color compensation method for LED displays with multiplexed pixel layouts to improve display yield and efficiency when LED chips fail. The method involves compensating for color defects caused by damaged pixels by analyzing surrounding pixels and adjusting the compensated display. It uses quadrilateral or parallelogram pixel arrangements with 4x multiplexing. The bright spot positions and values are captured from original images, then compensated image brightness and texture factors are calculated. Weighted averaging is done based on these factors to evaluate compensated image quality.

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Driving backplane, display screen, and display repair method that allows efficient repair of mini LED and micro LED displays without removing failed pixels. The backplane has spare contact pairs and overlapping electrodes for each pixel area. When a main LED fails, the overlapping electrode is connected to the spare contact to replace the main LED without removing it. This is done by detecting failed LEDs, identifying the faulty main color and location, and swapping it with a backup of the same color. The repair is done on the backplane without touching the main LED, improving repair efficiency and success rate compared to removing and reattaching a new LED.

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Device, method, control system and electronic equipment to repair blind spots on a real pixel display screen. The repair involves actively controlling individual subpixels in a display to compensate for blind spots. When a subpixel is lit, the brightness of the other two subpixels is set to zero. This creates a virtual pixel arrangement where all lit subpixels form a larger effective pixel. This is done using a data processing module between decoding and encoding the display signal. By actively controlling subpixels instead of replacing modules, it allows repairing a few blind spots without replacing the entire screen.

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Micro LED display with redundant pixels to prevent defects and blurring. The display has adjacent micro LEDs in each pixel that emit light based on the location of defective LEDs. If a micro LED doesn't emit properly, the adjacent micro LED compensates by emitting more light. This prevents defective pixels from being easily visible. The display also has a mapping system to track defective LEDs and generate correction maps to optimize light output.

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Display panel with improved yield by increasing repairability of subpixels. The display panel has pixels with multiple LED setting areas - a main area and at least one redundant area. This allows more LED replacements and repairs in subpixels prone to damage, improving yield. By selectively increasing redundant areas in certain subpixels, it balances repairability and pixel size.

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