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 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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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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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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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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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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Compensating the brightness of abnormal pixels in a display device to make the display uniform. Instead of replacing defective pixels, this method enhances the brightness of adjacent normal pixels with the same color to compensate for the abnormal pixel. It involves generating an updated image with adjusted gray scales for the normal pixels based on their original gray scales. The adjustment is calculated using weight ratios. By boosting the brightness of nearby normal pixels, it compensates for the darkened effect of the defective pixel.

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A method to compensate the brightness of pixels in a display panel to achieve more uniform brightness across the display. The compensation involves adjusting the gain coefficients of the display panel in addition to compensating the pixel values themselves. The gains are adjusted based on the gamma coefficients used to map grayscale values to display brightness. This allows tailoring the gains for different grayscale levels to better match the compensation coefficients and compensate for non-uniformity in the display's luminance response.

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Method for improving color consistency across all gray levels on LED displays, especially for high density, low current driven displays. The method involves collecting and correcting brightness at multiple gray levels instead of just one level. This captures chip brightness differences at different gray levels and calculates correction coefficients for each point. An average of the coefficients at each point is used for correction. Loading these averaged coefficients improves color consistency at low gray levels where uniformity is poorer compared to high gray levels.

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Point-by-point calibration method for LED displays that improves calibration quality and efficiency compared to standard methods. The method involves calculating correction coefficients for each LED pixel based on its actual brightness and ideal standard brightness. The calculations use a loss function and gradient descent to find the optimal coefficients. This allows iteratively adjusting each LED pixel's brightness to match the standard level. The method addresses issues like LED variability, signal distortion, and environmental effects by finding personalized corrections for each pixel.

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Method to improve uniformity of brightness and color in large display panels by compensating individual pixels. The method involves acquiring target color and brightness data from a pure color image displayed on the panel. This data is used to calculate conversion matrices for each color that map the target gamut to the actual panel gamut. These matrices are then applied to the display compensation process to adjust each pixel's color and brightness to match the target. The compensation accounts for variations in individual LEDs.

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