Uniform Pixel Control in Micro-LED Displays

Display correction method for LED screens with high integration of LED lights. It accurately adjusts LED lights to uniform brightness and chromaticity by dividing LED operation into multiple sub-field conduction states based on principles like pulse width compensation. Real response data and brightness ratios are collected in each sub-field to determine the actual mapping between response and brightness. This mapping is used to correct brightness/chromaticity coefficients when compensation pulses are present, improving display uniformity.

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Grayscale compensation method for improving display uniformity by selectively compensating grayscale of subpixels in specific display areas. The display area is divided into a first area and multiple second areas. The average brightness of the second areas is determined. Grayscale compensation is applied only to subpixels in the second areas to match their brightness to the target. This reduces brightness variation between areas. The compensation involves adjusting grayscale gains for subpixels of different colors. Boundary interpolation is used where subpixels straddle area boundaries.

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Brightness compensation method for display panels that improves accuracy of repairing mura (uniformity issues) using an external Demura system. The method involves determining the compensation weight for each pixel in a more accurate manner than traditional methods like mean, mode, median, or fitting. Instead, it expands the area surrounding the pixel being compensated and uses the grayscale values of that expanded area to calculate a more tailored compensation weight for the original pixel. This reduces accuracy loss during compression and restoration compared to using a fixed weight for all pixels in a block.

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Compensating display panels for uniformity issues by addressing brightness and color non-uniformities separately. The compensation involves driving the display to show a white image frame and a monochrome image frame. From the white frame, brightness compensation values are generated for each display area based on the white frame data. From the monochrome frame, brightness compensation values are generated for each subpixel based on the monochrome frame data. Finally, the subpixel compensation values are combined with the area compensation values to get the overall compensation for each subpixel. This allows reflecting both brightness differences between subpixels and color differences between display areas in the compensation.

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Compensating for dark spots in display panels caused by damaged LEDs. The method involves finding pixels with low grayscale values and adjusting the grayscale of nearby pixels with shorter distance. This spreads light to compensate for dark areas due to failed LEDs. The compensation is done by analyzing the display image, determining the coordinates of the original dark pixels, finding nearby pixels with shorter distances, and adjusting their grayscale values. This avoids direct LED replacement and helps improve display quality and yield.

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Compensating display panels to mitigate color uniformity issues like Mura. The method involves calculating a target brightness for a specific pixel based on the average brightness of pixels of the same color. If the pixel's brightness is significantly lower or higher than the average, it indicates unevenness. The target brightness is set accordingly to compensate. This per-pixel adjustment improves color uniformity by balancing brightness levels within a color channel.

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Single-point correction method, device and system for LED display screens to improve image quality without increasing costs for smaller pitch displays. The method involves iteratively adjusting the brightness of individual LEDs to correct color non-uniformity in a localized area. A correction device analyzes a small region of the display and identifies the brightness values of each LED. It then calculates optimal corrections to the brightness of specific LEDs to match a target color balance for that region. The corrected brightness values are sent to the LED controller to implement the adjustments. This iterative process is repeated for other regions to fine-tune the display's color uniformity.

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Compensating for uneven brightness in irregular shaped displays like notched screens by selectively adjusting pixel brightness. The method involves dividing the display into irregular and regular areas, calculating equivalent values for pixels in both, finding intervals with high occurrence frequency, identifying target pixels in the irregular area from those intervals, calculating compensation values, and applying compensation to the identified pixels in the irregular area. This optimizes brightness in irregular areas that tend to be brighter than regular areas due to reduced pixel count.

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Correcting brightness uniformity in mini LED displays with small pixel pitches to mitigate blockiness in low gray levels. The method involves compensating for current fluctuations in mini LEDs that cause brightness variations. It does this by dividing the adjustment range of the preset current into stages and separately mapping the fluctuation difference data for small and large current ranges in each stage. This allows more accurate correction of current fluctuations at low gray levels where brightness sensitivity is higher.

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Micro-LED display device and manufacturing method for improving display quality by reducing visible boundaries between adjacent regions. The device has a display substrate divided into arranged areas with splicing areas between them. Micro light-emitting elements are bonded to conductive pad pairs on the substrate. The splicing areas have filling positions alternating between two groups. 

In each transfer step, micro-LEDs are moved from a carrier to the substrate, with the transfer pattern leaving gaps for subsequent transfers to fill. This creates areas on the substrate where the LEDs have different offsets from the pads, blurring the boundaries between arranging areas when the display operates.

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Driving LED-based displays with high color depth, power efficiency, and reduced brightness variation, especially for micro-LED-based displays like those in AR/VR headsets. The display uses separate digital drive circuits on a silicon wafer and analog drive circuits on an indium-gallium-zinc-oxide (IGZO) layer between the micro-LED wafer and silicon wafer. This allows optimizing the digital and analog circuits using different processes. The analog circuits in IGZO have a higher voltage, lower leakage, and better uniformity for driving micro-LEDs, while the digital circuits on silicon generate control signals. The separation with level shifters avoids large transition regions.

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Method for manufacturing a micro-LED display that prevents non-uniformity of luminous properties. It involves segmenting the first substrate into regions and transferring the micro-LEDs from each region to different second substrates. This prevents uniform non-uniformity of luminous properties of the micro-LEDs on the first substrate from being transferred to the second substrate.

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Compensating brightness and chromaticity of display devices like miniLED displays to improve uniformity and color accuracy. The method involves calculating segmented compensation curves for each pixel based on its response characteristics in active array (AM) driving mode. This provides better compensation compared to linear methods. The segmented curves are generated by measuring compensation coefficients for a few initial current levels and then segmenting the uniformity change curve. This allows optimized compensation for each pixel's non-linear LED response.

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This is a method for transferring micro-LEDs from a transfer substrate to a target substrate to improve display uniformity. The method involves sequentially transferring micro-LED blocks from the transfer substrate to the target substrate. The key aspect is to ensure that the direction of the micro-LED electrodes in the second block matches the direction of the first block. This helps minimize luminance and chromaticity differences at the block boundaries. This is accomplished using different transfer substrates with micro-LEDs having electrodes in different directions.

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Micro-LED display panel pixel structure that improves display quality by optimizing luminance uniformity between pixels. The pixel uses a reflective layer with transmissive windows on the micro-LED. The reflective layer surrounds the micro-LED encapsulated in a transmissive filling material. The transmissive windows allow light from the micro-LED to directly pass through the reflective layer. The windows farther from the micro-LED have larger areas to compensate for light attenuation. This provides uniform luminance across pixels.

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Calibrating LED display screens with mixed modules from different batches to eliminate brightness and chromaticity variations between batches without full rescreen calibration. After initial calibration, measure the corrected brightness and chromaticity of each module. Use these values to determine a common target for secondary calibration. Then, apply the target to uniformly correct the entire screen. This avoids assembly and site calibration for mixed screens by leveraging the initial calibration data.

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A patterned substrate design for growing uniform Micro-LED epitaxial layers with consistent wavelength. The substrate has grooves to collect excess epitaxial material during growth. By preventing the excess material from centrifugal force, it avoids uneven thickness that causes variable wavelength. The grooves improve the uniformity and spectral consistency of Micro-LED epitaxy. This enables high-yield Micro-LED production with uniform wavelength across devices.

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Brightness compensation method for display pixels that improves mura (uniformity) without increasing calculation time. The method involves dividing the display into large basic compensation areas and smaller enhanced compensation areas. First, all pixels are compensated using a basic rule based on the large areas. Then, the pixels with the largest brightness differences are identified. These are compensated again using an enhanced rule in the smaller areas. This targets areas with tiny mura without increasing the number of compensation calculations.

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Compensating for brightness deviations in display panels by accurately determining and removing defective pixels and interpolating their values. The method involves capturing an image of the display, analyzing the brightness characteristics, detecting defective pixels, calculating compensation values, and removing defective pixel data. Adjacent pixel data is used to interpolate and replace the removed values. This prevents large deviation areas from forming. The compensation is applied iteratively to reduce deviations further.

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Correction method for improving gray-scale consistency of LED displays by optimizing correction for low grayscale levels. The method addresses the issue of inconsistent brightness changes of LEDs at low currents and grayscale levels. Instead of point-by-point correction at low grayscale, which is impractical due to limitations of LED production, the method uses module-level correction. It uses the same correction coefficient for pixels within a module to reduce storage requirements and improve speed. This eliminates brightness differences between pixels at low grayscale using high grayscale point-by-point correction. At high grayscale, it uses module correction to ensure consistency between modules.

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