Color Enhancement for Micro-LED Displays

Display device with improved light efficiency and reduced defects in multi-color microLED displays. The display has internal banks with electrodes on opposite sides, allowing light-emitting elements to be selectively placed between the electrodes. This forms alignment areas with elements and non-alignment areas without elements. By applying the same voltage to adjacent electrodes, an electric field is generated to attract elements between them. This concentrates elements in alignment areas while avoiding misplaced elements in non-alignment areas.

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Display device with improved luminous efficiency and reduced color mixture. The display has a substrate, partition walls, light-emitting elements, a filling layer, a light-blocking member, and optical patterns. The light-emitting elements emit light in separate areas partitioned by walls. The filling layer covers the elements. A light-blocking member prevents light bleed between areas. Optical patterns on the filling layer have a refractive index different from the layer. This redirects light to prevent color mixing from adjacent areas.

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Display device with improved light extraction and conversion efficiency using micro-LEDs. The device has a structure where the micro-LEDs have partitions surrounding them to form grooves. Light conversion materials are filled in these grooves to increase their thickness. Reflectors surround the micro-LEDs to direct emitted light towards the conversion materials. This improves extraction and conversion efficiency by avoiding light loss and reabsorption.

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A white LED with improved color rendition and luminous intensity by using a blue LED chip and specific phosphors. The LED emits blue light around 415-435nm, converted to cyan, green, and red using phosphors. The red conversion uses two phosphors, one with Mn and another without, for better color gamut. The green phosphor is Eu-doped. This phosphor mix creates white light with high CRI and R9 values, plus concentrated visible spectrum for higher luminous efficiency.

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Dual color LED structure for displays with improved color uniformity, brightness, and resolution compared to separate red, green, and blue LEDs. The structure has two independent LED regions emitting different primary colors. A partially reflective layer separates the regions. This reflects light from one color back and allows the other color to pass. This prevents direct mixing of the light from the two regions, reducing color contamination. The common primary light emitting surface area reduces pixel size, improves fill factor, and resolution compared to separate pixels. The combined brightness from both colors is higher than a single color LED.

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Color adjustment method for LED displays that improves color accuracy under varying ambient light conditions. The method involves collecting LED display data under different ambient lights, generating EETF curves for each light condition, and calling the appropriate EETF when ambient light changes to adjust display colors. This accounts for LED display gamut deviations and ambient light impact on color perception.

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Method for compensating color cast in LED displays to improve efficiency and accuracy of full grayscale linear calibration. The method involves determining the original red, green, and blue tristimulus values for all gray levels, finding the target white tristimulus values for the reference gray scale, and mapping the corrected red, green, and blue values for each gray level by minimizing a distance function between the original and target whites. This allows finding the mapping to redisplay according to the input image gray scale for full gray scale linear calibration.

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Method to determine correction coefficients for LED displays with mixed batches of LEDs to improve display quality. The method involves acquiring images of the display with multiple cameras having different filters, then determining the original and target color gamuts for each pixel based on the filtered images. By converting the original gamut to the target gamut for each set of colors, correction coefficients can be calculated for each pixel to correct brightness and chromaticity.

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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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Color calibration method for displays that improves accuracy by adjusting the backlight color parameters based on the target display colors. The method involves determining initial backlight color matching parameters for a given display color, having the backlight produce color using those params, measuring the resulting display color, calculating color matching coefficients based on the initial and target display colors, and finally adjusting the backlight parameters using the computed coefficients to achieve the target display color. This iterative process improves calibration accuracy compared to starting with fixed backlight params.

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Micro-LED display pixels to improve color purity and efficiency by collimating emitted light and reducing cross-talk between sub-pixels. Each pixel has multiple sub-pixels with lenses and reflectors that contain and redirect the emitted light. The reflectors reflect pump light and transmit converted light. They also have apertures to limit cross-talk. This improves efficiency by preventing unconverted pump light from escaping the pixel. The lenses collimate the light to increase collection efficiency. The reflectors and lenses are designed to match and optimize the sub-pixel emissions.

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Uniformity correction method for display devices that improves color and brightness uniformity without requiring assembly sorting. The method involves characterizing the chromaticity and brightness uniformity of individual display panels and backlights using calibration methods. This data is then used to generate correction lookup tables for each panel and backlight. During display operation, the correction tables are applied to correct for any deviations in chromaticity and brightness across the display. This allows compensating for variations in components without discarding and replacing panels during assembly.

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Display calibration method that improves overall display quality by calibrating both chromaticity and brightness. The calibration involves determining target chromaticity coordinates for each grayscale value, along with the target gamma curve based on those chromaticities. This allows converting displayed grayscale data using the target gamma instead of a fixed gamma. By considering chromaticity as well as brightness, it enables more accurate calibration of display colors and brightness levels.

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Vision-based color correction for mini LED displays to mitigate graininess and maintain picture quality as LEDs degrade over time. The method involves determining per-pixel color correction curves based on the initial and degraded colors of each mini LED. The display is divided into regions based on these curves, and corrections are made within each region. This takes into account visual impact between nearby pixels.

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A method for calibrating display color gamut that improves accuracy, efficiency and cost compared to traditional methods. The calibration involves determining display XYZ values for some known RGB colors, then mapping those XYZ values to the RGB values of the colors to be calibrated. This allows calibrating the full display using fewer measured XYZ values. The mapping relationships can be linear or based on functions.

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This method improves dynamic range, power consumption, and color and gamma correction of micro-LED displays. It involves providing individual emission control signals to each subpixel of each pixel to control emission time and duty cycle independently. This allows tuning color without affecting gamma.

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Calibrating display parameters of electronic displays to improve color accuracy and brightness without manual register adjustment. The method involves determining the maximum feasible brightness of the display based on its chromaticity coordinates. Then, target luminance and chromaticity are used to find the actual color parameters required. This allows accurate calibration without modifying RGB registers. It involves calculating actual white brightness components, converting pure color coordinates to brightness, and using preset relationships between luminance and color parameters.

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Full-color LED display using micro-nanofin LED elements that emit the same color for each subpixel. The display has subpixels with two or more vertically stacked micro-nanofin LED elements that emit the same color. The micro-nanofin LED shape increases the emission area compared to rod-shaped micro-LEDs. The micro-nanofin LEDs self-align on the subpixel electrodes when assembled. This allows high-resolution displays without individual LED placement. Micro-nanofin LEDs have higher efficiency and yield than nanorods.

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A method for manufacturing a display device to align the color point of the display with a target color point. The method involves providing a mix of differently colored first and second light-emitting units, measuring the optical characteristics of each unit, presetting the target display color point, and selectively transferring a subset of the first and second units to the display based on their measured characteristics to achieve the target display color.

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Accurately correcting color gradations on LED displays without degrading image quality. The method involves determining the total color scale of the LED display, adjusting the initial color coordinate values of each color level to match the target values using a target gamma curve, and then adjusting the gamma curve based on the sample color levels to further refine the color correction. This iterative process precisely converts the initial color gamut to the target gamut for each color level.

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