Uniform Pixel Control in Micro-LED Displays

Display method for spliced LED (MLED) displays that reduces image sticking and improves display consistency. The method involves compensating the gray scale of sampled frames during playback. The compensation is based on initial gray scale data, filtered temperature influence data, and a target gray scale compensation. This avoids acquiring screen temperature. Compensating frames without temperature measurements improves uniformity and reduces image sticking compared to uncompensated frames.

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Display and electronic device with reduced power consumption for still images while maintaining consistent color. The display uses a microLED with a control circuit that includes a triangular wave generator, comparator, switches, and transistors. When displaying a still image, the first transistor retains the data potential. A triangular wave is output to the pixels. The comparator generates an output signal based on the retained potential and triangular wave. Switches control the microLED current based on the output signal. This allows the microLED to continue emitting at reduced brightness without PWM when the display is static.

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MicroLED structure and chip design that enables higher packing density and simplified manufacturing compared to conventional microLED designs. The microLED structure has the active layer extending horizontally beyond the top and bottom electrode layers. This prevents the active layer from touching the electrode edges. The electrode layers are aligned vertically. This allows the active layer to be continuously formed across the entire chip, with multiple microLEDs sharing the same active layer. Isolation structures are used between microLEDs, with at least a portion formed in the active layer. This allows the active layer to extend fully across the chip without interruption. The isolation structures prevent light crosstalk between adjacent microLEDs.

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Display panel and device with improved resolution and aperture ratio by using microprisms to concentrate light from individual LED pixels. The display panel has LED chips, driving circuitry, and an encapsulation layer. Microprisms are arranged above the LEDs, with one prism corresponding to each LED. The prisms have protrusions that focus the LED light. This reduces the angle of emitted light, minimizing mixing with neighboring pixels and eliminating the need for black matrix. It also brings the prism closer to the LED for better focusing. The prisms can be disposed on the encapsulation layer or directly above the LEDs. This reduces color shift, improves aperture ratio, and decreases pixel pitch compared to conventional displays with black matrix.

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A light-emitting device with improved scratch resistance and bend tolerance while still allowing thin, flexible substrates. The device uses two adhesive layers with specific properties between the substrates and the light-emitting element layer. The first adhesive layer has a thickness of 10-25 μm and shear modulus of 4.0E+04 - 1.0E+05 Pa at 23°C. The second adhesive layer has a thickness of >0-15 μm and shear modulus of >1.0E+05 Pa at 23°C. This combination allows high pencil hardness on the device surface while preventing defects in the light-emitting element layer from substrate bending.

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A display device that actively controls the viewing angle of displayed images to protect privacy. The display has a mode switching mechanism that allows pixels to be turned off in a first mode to block light emission, reducing viewing angle. In the second mode, pixels emit light normally. This allows the user to toggle between a narrow view angle for privacy and a wider view angle for normal use. The switching is achieved by turning off a transistor in the pixels in the first mode. This allows the display to process image data the same way in both modes to reduce power consumption.

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Display substrate and display apparatus with reduced IR-drop in organic light-emitting diode (OLED) displays. The display has a lapping connection between the OLED cathode and the power supply line near the bottom of the display region. This reduces the length and resistance of the lead wires connecting the power supply to the bottom chips compared to lapping only between the cathode and a separate power line. It also covers the connection regions for both the bottom sub-connections and the main power connections. This reduces IR-drop in the display. The connection regions are formed by lapping vias or planarization layers.

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Stretchable display with stretchable electrode connections and encapsulation for flexible displays. The display has a substrate with islands connected by narrower connection parts. The display elements are on the islands and electrode connections are made across the narrower connection parts. This allows the connection parts to stretch without breaking the electrode connections. The display is encapsulated with an inorganic layer around each display region. This prevents delamination during stretching. The inorganic layer surrounds the connections and encapsulates the display region. This allows stretching without breaking the electrode connections.

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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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Brightness compensation method and device for display panels to accurately compensate brightness of individual pixels in high resolution displays where adjacent pixels interfere with each other and make brightness calculations inaccurate. The method involves selectively activating pixels, inserting non-emitting pixels between adjacent emitting pixels, and calculating brightness for each activated pixel. This isolates and accurately determines the brightness of individual pixels.

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Compensating gray scale in display pixels with different subpixel sizes to eliminate differences in perceived brightness. The compensation is done block by block for pixel groups with different aperture areas. Gamma curves are measured for each group, compensation voltages are calculated based on the curves, and these voltages are transmitted to the pixel drivers. This allows adjusting the gamma compensation for each group independently to match gray scales despite variations in subpixel size.

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Display panel with uniform luminance and a method to prepare it. The method involves adjusting the emission brightness of selected subpixels to compensate for differences in response time due to varying distances from the driving circuit. The adjustment is based on measuring the actual emission brightness of each subpixel and comparing it to the desired brightness. By setting target parameter values for the subpixels based on this comparison, the brightness of all subpixels can be made uniform.

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Pixel structure for display panels that can improve the uniformity of overall optical properties of a displayed image from micro-LEDs. The pixel has a micro-LED surrounded by a sidewall structure filled with a light-transmissible material. A reflective layer on top has windows that transmit light. The micro-LED projects upward onto the reflective layer. The windows further from the projection area are larger, adjusting the aperture ratio of the reflective layer to balance brightness between pixels.

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Method to improve display uniformity after Mura compensation in displays. It aims to further reduce display unevenness after compensating for Mura defects. The method involves calculating average brightness values within compensation units and adjacent units. If the difference between the averages and the initial compensation values is small, it means the compensation is already sufficient. But if the difference is large, it indicates the compensation needs improvement. In that case, a transition area is created between the units with larger difference. The brightness compensation values in the transition area are adjusted based on the averages of both units to prevent under/over compensation.

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Optical compensation method for improving display panel brightness uniformity and reducing pixel brightness differences. The method involves adjusting the brightness of specific pixels based on predetermined compensation parameters. By adjusting the brightness of target pixels based on brightness ratios compared to reference pixels, it reduces the brightness variation between pixels when displaying grayscale levels. The compensation parameters are determined for each grayscale interval. This compensates for pixel-to-pixel variations in response to standard voltages, improving overall display brightness consistency.

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Micro-LED color display device that improves color uniformity and stability. The display has an array of blue, green, and red sub-pixels. Each sub-pixel contains a micro-LED. The key feature is a support layer between the driving and package substrates. This support layer helps separate the sub-pixels and reduce color crosstalk. It prevents the peak wavelength shift in one color sub-pixel from affecting adjacent sub-pixels. The support layer improves green color stability and overall color uniformity of the display.

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Method and system for adjusting brightness of display panels to compensate for uneven light emission between subpixels. The method involves determining the subpixels with lower brightness than desired, calculating the required compensation current to match target brightness, and feeding back that compensation value to the display driver to adjust the subpixel brightness. This compensates for inherent variation in subpixel luminance and improves overall display uniformity.

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Reducing artifacts and improving uniformity in display devices by re-correcting initial calibration coefficients to address visual artifacts that persist after initial calibration. The display device receives initial correction coefficients for some pixels, compares luminance between those pixels and surrounding pixels, adjusts the initial coefficients based on the comparison, and uses the adjusted coefficients to control the display. This re-calibration addresses artifacts caused by sub-pixel coefficients that approach zero, improving visual uniformity and reducing optical illusions.

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Calibrating LED displays to improve uniformity and color accuracy. The method involves measuring the luminance and chromaticity of each pixel of the display, analyzing the data to derive the distribution of a specific color element, comparing it to a reference distribution, and reducing the distribution if necessary. Correction coefficients are calculated for each pixel based on the reduced distribution. These coefficients are applied to correct the luminance and chromaticity of each pixel to match the reference uniformity.

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Method, device, and equipment for improving display brightness uniformity by accurately compensating display screens with uneven brightness. The method involves calculating more accurate compensation data for each pixel block based on their brightness. This is done by adjusting an initial reference brightness for the display based on the block brightness. Then, using the adjusted reference and block brightness, more accurate compensation data is calculated for each block. This allows compensating display screens with large brightness differences more accurately, improving uniformity compared to fixed compensation ranges.

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Micro-LED display panel that improves display quality by reducing pixel defects and improving color uniformity compared to conventional micro-LED displays. This is achieved by connecting two micro-LEDs in series within each pixel, with one having a dominant wavelength in a specific color range. If one has a defect or a different wavelength, the other can compensate for displaying the intended color by using series-connected pairs of micro-LEDs.

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Compensating pixel brightness in displays to mitigate uneven brightness due to voltage drops in long wire lengths. The compensation involves adjusting grayscale values to compensate for voltage drops. The steps are: 1) Displaying white, measuring grayscale, calculating first brightness. 2) Measuring actual grayscale, calculating second brightness difference. 3) Adjusting grayscale to third value (sum of 1 & 2). 4) Calculating pixel offsets based on subpixel measurements. 5) Using offsets to drive pixels with adjusted brightness. This compensates for voltage drops and eliminates screen brightness variations.

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Method to correct uniformity issues in LED displays by optimizing calibration efficiency and accuracy. The method involves two stages of calibration - module calibration and partition calibration. In module calibration, the display is divided into subregions and all LEDs in a module are calibrated simultaneously. In partition calibration, the display is further divided into smaller sections and each section is calibrated separately. The final corrected display is obtained by multiplying the module and partition correction coefficients for each LED. This two-stage approach balances efficiency for large displays and accuracy for small areas.

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Compensating grayscale values in displays to improve overall brightness and reduce mura (uniformity issues). The method involves capturing images of the display at different grayscale levels, analyzing the images to find pixel groups with similar compensation values, and recording the compensation values and positions of those groups. This allows more accurate compensation for grayscale nonlinearities compared to linear interpolation. The recorded groups can then be used during display operation to compensate the grayscale values for those pixels.

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Optically compensating display devices to improve display quality in high gradation applications where panel uniformity can degrade. The compensation involves calculating a gradation difference between a target brightness and measured brightness for a pixel, then storing that compensation in memory. During display, the device uses the compensation gradation instead of the original gradation to compensate for panel non-uniformity in high gradations. This allows higher brightness compensation in pixels that initially emit low brightness.

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Compensating for brightness non-uniformity in high density LED displays with interconnected modules to reduce visible seams and improve overall display brightness. The method involves adjusting the brightness of individual modules in the display to compensate for brightness variations caused by the gaps between modules. This is done by measuring the brightness at the edges of each module and adjusting the brightness of neighboring modules to match. This compensates for differences in light reflection and scattering due to gaps between modules, which can cause dark lines or uneven brightness when adjacent modules are not perfectly aligned. By adjusting the brightness of individual modules, it reduces the visibility of seams and improves overall display uniformity without requiring precise module alignment or increased manufacturing cost.

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A display homogenization system and method that improves uniformity of brightness and color across a display panel, especially large panels. The method involves separately displaying different gray levels on the panel and using a photodiode array to measure luminance and color in each display unit. Based on the measured data, the brightness of each unit is adjusted for luminance uniformity. In the effective display area, a central unit serves as a reference for color. The red and blue subpixels of other units are adjusted to match the reference for color uniformity.

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Led display screen with uniform brightness across pixels to prevent mosaic and color issues. The method involves transforming RGB data using gamma correction and calculating compensation brightness for white LEDs based on attenuation coefficients of red, green, and blue LEDs. This allows adjusting each pixel's brightness without changing overall display brightness, mitigating brightness differences between pixels.

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Regulating pixel brightness at the edges of adjacent display modules in LED screens to mitigate visual artifacts when the modules are joined together. The method involves comparing the actual pixel spacing to a predetermined standard and adjusting the brightness of pixels near the edges based on the comparison result. This compensates for errors in pixel alignment during module assembly to improve overall screen uniformity and reduce perceived brightness lines between modules.

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