Micro-LEDs for Commercial Signage

LED display device that improves brightness and color gamut compared to conventional RGB LED displays. The display uses a modified sub-pixel arrangement where the number of green LEDs is greater than or equal to the number of white LEDs, and greater than the number of red or blue LEDs in each sub-pixel. This allows displaying color, grayscale, and black/white by controlling the green, white, and optionally red/blue LEDs. The extra green LEDs compensate for reduced green intensity when mixing primary colors for white. The display device has basic units with configurable sub-pixels (RGBW or just RGBW) and a controller that reconstructs input images for the modified sub-pixel layout.

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A method for improving the contrast ratio of displays like LCDs without requiring a separate backlight. The method involves using microLEDs as the light source instead of a separate backlight. MicroLEDs are small-scale LEDs that can be packed densely and driven at high brightness levels. The microLEDs are arranged in close proximity to the liquid crystal pixels, allowing them to directly illuminate the LCD display without the need for a separate backlight. This eliminates backlight bleed and improves contrast ratio compared to traditional LCDs.

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LED display system, method and device with high brightness and reliability for large-scale applications like sports events. The system uses multiple LED display units arranged in a grid, with a central controller, to form a large screen. It responds to actions at specific positions by generating a control signal to display content at those positions. This allows synchronized effects with athletes or objects. The display units have sub-controllers and base plates with LED arrays. The central controller divides and sends display data to sub-controllers for localized display. This allows high-resolution screens with segmented data transmission. It also enables customization like turf overlays on LED floor screens.

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Reducing linear defects observed when micro LED modules are arranged using a tiling technique in displays. The modules have a recessed lower body and a top plate. When tiled, the recessed lower bodies provide gaps between modules that prevent linear defects from being visible on the display. The top plates of adjacent modules cover the gaps. This allows close tiling of the modules with reduced visible defects compared to touching edges.

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Micro LED array display device that enables individually driving and controlling micro LED pixels using flip chip bonding on a CMOS backplane. The display has a micro LED panel with multiple pixels, a CMOS backplane with cells corresponding to each pixel, and bumps between them. The micro LED pixels are flip chip bonded to the CMOS cells to drive them individually. This simplifies wiring and eliminates data lines compared to connecting each pixel. The display can also be a full color implementation with red, green, and blue micro LED panels bonded to the same CMOS backplane.

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LED display screen with improved low gray level performance to mitigate issues like color cast, inaccurate grayscale and flickering. The display has a substrate with pixel units on one side and a driving unit on the other. The pixels have red, green and blue subpixels stacked vertically. The driving unit connects to the red and green subpixels. The control method involves setting grayscale data, a low threshold, and comparing subpixel data to trigger a timing control signal. The driving unit then lights the subpixels in sequence based on the timing. This allows accurate low grayscale display without issues like color cast or flickering.

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LED light control circuit for intelligent electronic signs that allows display of different images on multiple LED modules based on user instructions. The circuit has separate drive modules for each set of LEDs. This allows each set to be independently controlled for customized displays. A central control module coordinates the drive modules and communicates with them using a protocol like DMX512. This allows complex synchronized displays across multiple LED sets.

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Display device with customizable modular LED displays that can be assembled into any shape. The modular LED displays each have their own controllers and power connections. The modular displays are manufactured by processing them based on their specific shapes. The processed modules are then assembled into the final display. This allows creating displays of arbitrary shapes by optimizing the modules for each shape instead of designing custom displays for each shape. The central processor converts and sends content to the module controllers based on their shapes.

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LED display device with improved brightness and reduced power consumption compared to traditional dynamic scan LED displays. The device has a separate power supply for each color of LEDs in a pixel. Instead of using a common power supply for all colors, each color's LEDs are powered individually by the driver chip. This prevents voltage drop issues and reduces power loss compared to driving all colors from a single supply. It also allows independent brightness adjustment of each color without affecting the others.

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Micro LED display device that can be connected to neighboring micro LED displays to form a tiled display system without requiring individual setup. The displays have terminals on their side surfaces to connect to adjacent displays. Each display contains a controller that can communicate with connected displays using packets containing arrangement and identification data. This allows the displays to exchange data and synchronize without a central controller.

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LED display screen that combines display functionality with supplementary lighting capability in a single device. The display screen uses RGBW LED lamp beads and dual driver chips to achieve both functions concurrently. One driver chip drives the display pixels while the other chip controls the white LEDs for supplementary lighting. This allows the display screen to serve as both a visual display and fill light source in applications like XR virtual production.

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Current-selectable microLED displays that improve power efficiency by matching the electrical current range to the pixel luminance range. The displays use clusters of microLEDs controlled by dedicated cluster controllers. Each cluster controller has a selectable current source that provides a specific range of currents. The controllers choose the right current level based on the pixel brightness to avoid unnecessary power waste. This reduces leakage in the current sources and improves efficiency compared to fixed-current sources. The clusters can be arranged over the microLED array to enable this per-pixel current customization.

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Pixel drive circuit for microLED displays that improves luminance, gray scale and stability. The circuit has separate current and light emission control circuits. The current control circuit outputs a fixed current to the microLED, keeping it at a high current density where efficiency is stable. The light emission control circuit pulsed drives the microLED using a capacitor charged by a variable voltage. This allows precise control of emission time. The fixed current and pulsed emission together optimize microLED performance.

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LED display screen that improves resolution and reduces cost compared to fixed displays. The display has LED modules that can swing back and forth in parallel with the screen surface. This allows the modules to move while displaying images to fill in gaps and improve coverage. The swinging motion is synchronized with the video to maintain display while moving. This prevents pixelated or pointy images. It also reduces the number of modules needed for equivalent resolution versus fixed screens.

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A modular flat panel display with reduced visible seams between smaller displays when joined together. The display has a panel with an edge length less than the internal pixel spacing. This is achieved by connecting the LEDs to the pixel circuits using vias that go through the substrate, allowing the LEDs to be positioned closer to the edge. This reduces the non-emitting space at the edge compared to the internal pixel spacing, minimizing the visible seams when multiple panels are joined.

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LED display device with reduced flicker and motion blur using a channel scan switch that allows the LED array pins to be switched between scan and source mode. The channel scan switch has multiple cores for driving anodes and cathodes of the LEDs. By selectively switching between scan and source mode for the anodes and cathodes, it enables each LED in a group to light up separately, reducing flicker. Interleaving the anodes and cathodes further reduces motion blur by preventing simultaneous lighting of adjacent LEDs. The channel scan switch allows flexible driving of large LED arrays with fewer connections.

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Miniature LED display device that achieves high brightness by using multiple sub-pixels of different colors in each pixel and driving them in a specific way. The display has a matrix of pixel regions, each with k parallel sub-pixel regions, each containing j mini LEDs of different colors. The driving circuit has two modes: in mode 1, the rows are enabled sequentially with each row displaying a single color in one sub-pixel; in mode 2, the rows are enabled sequentially with all k sub-pixels in a row displaying the same color simultaneously. This allows simultaneous high brightness from multiple sub-pixels in mode 2.

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Reducing pixel pitch of microLED displays by separating the driver circuitry from the microLED array. The microLED matrix is on one side of a substrate and driver circuits are on the other side. Conductive paths in the substrate connect the microLEDs to the drivers. This allows reducing pixel size beyond the microLED size limitation. A separate driver circuit provides scan and PWM signals to the matrix drivers. The matrix drivers then control the microLEDs based on the scan and PWM signals.

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MicroLED display with in-pixel pulse width modulation (PWM) circuits to improve power efficiency and color accuracy at low grayscale levels compared to traditional column-based PWM. Each pixel has a compact PWM circuit that converts low-frequency sawtooth or triangular pulses from the column drivers into PWM pulses to drive the microLED. This allows using longer pulses from the column drivers instead of short high-frequency pulses, reducing power consumption. A digital-to-analog converter provides the grayscale data. The in-pixel PWM circuits have 7 or fewer transistors for compactness.

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A nano-pyramidal LED display with improved manufacturing yield and cost compared to traditional micro-LED displays. The nano-pyramidal LEDs are grown on a wafer, with each LED having a coupling layer that allows selective bonding to a backplane with matching pads. This enables mass production of red, green, and blue nano-pyramidal LEDs on the same wafer, unlike micro-LEDs. The nano-pyramid shape improves efficiency compared to planar LEDs. The selective bonding prevents short circuits when transferring the nano-pyramidal LEDs to the backplane. This reduces yield requirements and cost compared to pick-and-place transfer of micro-LEDs.

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