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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

Display system and color characteristic measurement method that provides accurate color characteristics for displays without requiring specialized equipment. The system involves storing calibration parameters for the RGB channels, measuring the displayed colors, and calculating the corrected RGB output percentages using the stored parameters. This allows obtaining accurate color characteristics for display algorithms without using expensive spectrometers. The calibration involves measuring monochrome spectra or CIE tristimulus values of the RGB channels, which are then used to derive the calibration parameters.

Source

Method to correct color cast distortion in LED displays. The method involves generating a set of reference measurements with known current amplitudes and acquiring corresponding images. It also involves generating a set of corrected measurements with unknown current amplitudes and acquiring corresponding images. From the known and unknown images, complementary color coefficients are calculated to correct the color cast in the unknown images.

Source

A method for accurately measuring and correcting colors between self-luminous display devices like displays and LEDs, by selecting the appropriate color matching function for different viewing angles. The method involves organizing observers to match colors between displays with different primary spectra at various angles using CIE recommended colors. By calculating the color difference at each angle, the optimal color matching function for accurate color perception between displays can be determined. This allows selecting the suitable CIE color matching function for color measurement and correction between self-luminous displays based on viewing angle.

Source

Micro-LED display system and method to improve dynamic range, power consumption, color accuracy, and gamma correction. The method involves independently controlling each sub-pixel's emission times and duty cycles in a pixel using individualized control signals. This allows precise color adjustment without affecting gamma. It also enables optimizations like varying emission times/duty cycles by grayscale range to reduce power.

Source

Compensating for color deviation in display devices without requiring large external memory. The method involves dividing the display into regions, measuring optical characteristics in those regions, calculating region compensation coefficients, and storing them internally. When displaying an image, the region compensation coefficients are loaded, interpolated for the display resolution, and used to calculate pixel-level compensation coefficients. This allows compensating for color deviation without storing large per-pixel compensation data.

Source

Driving circuits for micro-LED displays that improve color depth and uniformity, reduce power consumption, and improve manufacturability and testability. The circuits separate the digital drive circuits for controlling individual micro-LEDs from the analog drive circuits providing the drive currents. The digital circuits are on a silicon wafer, and the analog circuits are on an indium-gallium-zinc-oxide (IGZO) layer. This allows for optimizing digital and analog circuits using different process technologies.

Source

Method to correct LED displays with freely settable color gamut adjustment that ensures consistent color across the display and avoids mottling. The method involves dynamically adjusting the correction coefficients for each pixel based on its gray level. Above a certain gray level, single-pixel color gamut conversion coefficients are used. Below that level, point-by-point correction coefficients are used. This allows consistent color across the display when gamut adjustment is enabled, without mottling or color distortion.

Source

Calibration system for LED displays that improves color accuracy and reduces calibration time by addressing issues of LED temperature drift and measuring inaccuracies. The system uses a processor to iteratively find the optimal gamma correction for each grayscale level based on measured brightness and chromaticity data. It also suppresses LED temperature rise during measurements to mitigate drift. This allows quick, accurate calibration compared to traditional methods.

Source

Backlight module, display module, and color calibration method for improving color accuracy in displays. The backlight module uses side-mounted LEDs with adjustable brightness to provide customized lighting for the display. The display itself has a calibration feature that allows adjusting the colors of the display pixels through software. This enables fine-tuning of the overall display color balance by compensating for variations in the LED backlight and display components. The side-mounted LEDs provide better control over color mixing compared to top-mounted LEDs. The customizable backlight and display calibration improves color consistency and reduces color variation between displays.

Source

A light source apparatus with multiple emitters that can switch between different operating modes to produce tailored color gamuts, such as eye-safe night mode and wide gamut mode. The apparatus contains emitters like blue, cyan, yellow, green, and red that can be selected individually or combined. The emitters are coupled with color-conversion materials tuned to each mode. This allows the device to switch between blue-containing modes for a wide gamut and blue-free modes for eye safety. The multiple modes are supported by adjusting color channel intensities and using optimized conversion materials.

Source

Micro-LED display panel technology to prevent color mixing caused by light leakage between adjacent micro-LED strips. The display has a driving substrate with bottom electrodes and light-shielding layers between the electrodes. Micro-LED strips of different colors are bonded to the substrate, with the shielding layers spacing them apart. This prevents light leakage and color mixing between the strips.

Source

Micro-LED display that can sustain high brightness without overheating, which can lead to color degradation and reduced lifetime. The display uses micro-caps to insulate the tiny LEDs from the substrate thermally. The micro-caps create sealed chambers around each LED that can be filled with gas or vacuum. This prevents heat buildup and protects the color conversion layers. The display also has color material layers on the micro-caps to enhance color performance.

Source

Micro-LED display production with improved subpixel isolation to prevent crosstalk and color mixing. Opaque isolation walls are formed between the subpixels using a multi-step deposition and etching process. This isolates the micro-LEDs and color conversion layers to maintain color purity. The walls are opaque, which blocks light transmission between subpixels. This prevents adjacent subpixels from being illuminated and cured during manufacturing. The opaque walls allow UV micro-LEDs to be used with color conversion without crosstalk. The walls are formed by depositing and etching multiple layers to create vertical walls higher than the subpixels.

Source

Wide color gamut display method for improving non-visual effects like blue light hazard and biological rhythm impact, while maintaining wide color coverage and color gamut stability. The method involves optimizing the wavelength and spectral width of the four primary color microLEDs in a display. By finding the peak wavelength and half-width range that balances color gamut, blue light hazard, and biological rhythm impact, it allows achieving a wide color gamut, low blue light, and low biological rhythm impact display.

Source

Micro-LED display panel with reduced color shift at oblique angles by using differently sized light-shielding walls around micro-LEDs of different colors. The light shielding walls control the light emission angles to match more closely across colors, reducing color shifts when viewed off-axis.

Source

A patterned substrate design for producing micro-LED displays with improved epitaxial layer thickness uniformity and LED chip performance. The substrate has grooves that catch excess material during epitaxial growth, preventing uneven layer thicknesses that cause wavelength variation. The grooves are selectively etched into the substrate, and excess epitaxial material is collected to ensure a uniform layer. This improves LED performance by reducing variability in color and brightness.

Source

Correcting chromaticity of LED displays to overcome uneven color output across the screen. The method involves determining the actual chromaticity of a target LED when displaying a primary color, calculating a correction coefficient based on the actual and reference chromaticities, and applying the coefficient to correct the primary color emitted by the target LED. This iterative process is repeated for other primary colors as needed.

Source

A technique to attach downconverter layers to LED dies that enables high-resolution displays and lighting systems with precise color control. The method involves using a temporary transfer layer with downconverter pixels adhered to a release liner. The transfer layer is brought into contact with the LED dies at elevated temperatures, where the adhesive becomes sticky. Once cooled, the release liner is removed, leaving the downconverter pixels attached to the LEDs. The pixels contain downconverter materials like phosphors for color conversion. This allows the downconverter layer to be accurately applied to the LED dies in a single step without pick-and-place assembly.

Source

Correction method for display devices to improve color temperature stability and accuracy. The method involves iteratively correcting pixel values within a range where they have similar color temperatures. This is done by finding standard pixel values with the target color temperature, determining intervals with pixels between them, and correcting the pixels in those intervals to match the standards. This allows more independent color temperature adjustments versus just max brightness, improving accuracy and stability across brightness levels.

Source

Improved display structures that enable higher performance, efficiency and customization of micro-LED displays through optimizing the LED structure and interconnects. The improved display structures can extract more light, customize the color and angular output, and enhance heat sinking. The main idea is to tune micro-LED properties by patterning and releasing the LED layer from the growth substrate then bonding it to a different substrate with customized contacts. The micro-LED array is grown on a substrate, patterned and released, then bonded to a transparent carrier substrate with individually addressable contacts for each LED. This allows optimization of the LED structure and interconnects to improve light extraction, emission angle, color conversion, and heat sinking compared to traditional micro-LED displays.

Source

Method for optimizing micro-LED display performance by independently controlling the emission time and duty cycle of each subpixel in a pixel to improve color accuracy and power consumption without affecting the gamma.

Source

Controlling subpixels of microLED displays to independently adjust their emission time and duty cycle. This enables precise color calibration and optimization of power consumption and dynamic range.

Source

Method for improving display uniformity to reduce color blocks and spots. The method involves separately calculating chroma and brightness uniformity instead of combining them. Chroma uniformity is calculated based on primary color changes and intensity. Brightness uniformity is calculated using chroma uniformity, brightness comparison, and intensity. This separate calculation helps prevent issues like color patches when adjusting for both chroma and brightness together.

Source

Method and system for chromaticity correction after arbitrary splicing of LED display screens to enable accurate color calibration when screens are reconfigured or modules are replaced. The method involves using a professional camera, PC, and control card to read the color data from individual LED modules, calculate correction values, and send them to the control card to adjust the module's output. This allows recalibration without needing to re-determine standards when screens are reorganized or modules are swapped.

Source

Method for calibrating color coordinates of a display panel to improve color accuracy and minimize loss of brightness and gamut coverage. The method involves adjusting the primary color light emissions to meet required ranges using a conversion matrix. It shifts the color coordinates of the primary lights by changing their excitation levels. This avoids requiring separate color filters or LEDs for each primary. The matrix coefficients are calculated based on the original and target color coordinates and white balance temperature. It allows simple, quick calibration compared to replacing entire light sources.

Source

Process for manufacturing optoelectronic devices such as LEDs or micro-LEDs with improved color stability and reliability. The process involves applying and curing multiple layers of a formulation containing a silazane polymer and wavelength converting materials onto the device precursor. The silazane polymer acts as a binder to encapsulate the converting materials. By layering and curing in a specific order, the color point can be precisely adjusted. The silazane binder provides barrier properties and stability to the converters.

Source

Method and system for matching and correcting panel color temperature to improve display color uniformity by using multiple color analyzers to measure the entire display area. The system has a first color analyzer to measure a specific area and a second color analyzer to measure the entire display area. Differences in color values between the two analyzers are used to generate a new calibration target for the display. This allows correcting color across the entire display instead of just the center, reducing visual differences between areas.

Source

Method for depth color correction of micro LED displays to improve color uniformity and prevent issues like pitting and blurring. The method involves constructing a color correction parameter matrix for each display pixel based on its original RGB values. This matrix is then used to adjust the pulse width modulation (PWM) duty cycles of the pixels to correct their colors. A camera captures the initial RGB data, and a processor calculates the correction parameters. This allows micro LED displays to have consistent colors across pixels without needing mechanical processing or individual testing.

Source

Display system and color characteristic measurement method that allows obtaining accurate color correction values for displays without using expensive equipment. The method involves measuring the color of the display using a color meter and then calculating correction values based on known parameters. This allows determining the optimal output percentages for the RGB channels to match the measured color. The correction values are obtained using the known RGB parameters and the measured color values.

Source

Point-by-point calibration method for LED displays that improves color accuracy and uniformity without re-calibration when replacing modules. The method involves storing not just chromaticity correction data for each module, but also the module's brightness and color coordinates. When a module is replaced, a transformation matrix is calculated based on the screen's vs module's color parameters. The module's calibration data is then transformed using this matrix before applying it to the new module. This allows using the existing module calibration without re-calibration when replacing modules. It avoids direct use of the stored calibration data, which can cause chromaticity errors due to differences in screen vs module color parameters.

Source