Color-Tunable Micro-LED Display Control

Display device with adjustable color performance by selectively controlling the driving current pulse amplitude and width for each subpixel's LED. This allows compensating for variation in LED peak wavelengths and improving color fidelity and reducing color deviation. The subpixels each have a LED and control circuit. The circuits provide different driving current pulse amplitudes to make the LEDs emit at the target wavelength. They also provide varying pulse widths to adjust LED brightness.

Source

Micro LED display with improved color accuracy at high brightness levels. The display has subpixels with two micro LEDs of different colors driven independently. The current ratio between the micro LEDs is adjusted based on grayscale level. This prevents color shift as driving current increases. At low grayscale, only the shorter wavelength micro LED is on. At high grayscale, only the longer wavelength micro LED is on. In between, the longer wavelength micro LED current increases relative to the shorter wavelength micro LED. This maintains consistent color appearance at all grayscales by matching dominant wavelengths.

Source

Micro LED color display device with improved color uniformity and stability. The display has blue, green, and red subpixels sandwiched between a driving substrate and a package substrate, with a support in between. This sandwich structure allows independent optimization of each color subpixel without affecting the others. This improves color uniformity by reducing deviations from LED binning and allows easier control of green color stability compared to traditional RGB displays.

Source

A compact, energy-efficient, and high-resolution micro LED display backplane suitable for wearable devices. The backplane uses a reference current source and current mirrors to provide stable power to the LEDs. This allows smaller size, improved brightness, contrast, and refresh rate compared to conventional backplanes. The backplane also has a pixel driving controller array with switches, memory, and a global brightness controller to enable fine-grained control over each LED. This allows optimized grayscale and color scaling.

Source

Display device with combined pixel driving methods to improve color depth in small pixel sizes. The display has pixels with subpixels driven by either pulse width modulation (PWM) or pulse amplitude modulation (PAM). A processor selects the driving method per subpixel. The PAM method uses multiple levels of drive currents to increase color depth in small pixel sizes where voltage range is limited. PWM is used for larger pixels. The PAM levels are reassigned between regions to compensate for threshold voltage variations between pixels. This allows fine color gradations in small pixels without sacrificing overall color depth.

Source

Multi-channel LED driver for accurate color mixing and temperature control. The driver has separate current control circuits for red, green, and blue channels. A channel controller generates reference signals based on desired color temperature. This allows accurate color mixing by independently adjusting channel currents. A feedback loop monitors the green channel to control headroom voltage and prevent excessive power dissipation in VCRs.

Source

A light emitting module with high degree of freedom in color adjustment using a movable optical element. The module has multiple light emitting parts, an optical member with extractable regions for different chromaticities, a change mechanism to move the optical member relative to the lights, and a lens. The extractable regions are paired 1:1 with the lights. Moving the optical member along the lens axis changes the light extraction positions relative to the lights.

Source

Light emitting device with high reliability and color accuracy through in-situ calibration and feedback control of LED lighting elements. The device has a circuit board with separate areas for the LEDs and control circuitry. The LEDs have test pads exposed for measuring their characteristic parameters. A sealing structure covers the LEDs and control circuit. The control circuit records the LED parameter values. By testing and feedback adjustment, the LEDs can be calibrated to match desired lighting characteristics even if they have initial variations.

Source

MicroLED display with individually controllable pixel brightness. The display uses a unique pixel structure with multiple sub-LEDs surrounded by a barrier. Some sub-LEDs emit the main color while others emit a secondary color. Driving individual sub-LEDs allows controlling the overall pixel brightness by selectively turning on sub-LEDs. This avoids the issue of brightness regulation in conventional MicroLEDs where all subpixels are driven together. The barrier prevents light crosstalk between adjacent pixels.

Source

Micro-LED full-color display module and preparation method that improves color purity and stability compared to traditional microLED displays. The method involves generating white light microLED arrays on a drive substrate through spontaneous emission. Then, color conversion filters are added to each group of microLEDs to separate the white light into red, green, and blue pixels. This allows periodic arrangement of red, green, and blue subpixels in each cycle to create full-color pixels. It eliminates the need for precise microLED transfer and color conversion media like phosphors or quantum dots.

Source

Micro LED display panels with improved color accuracy and robustness by having each pixel contain different numbers of red, green, and blue LEDs to drive them with the same current level. This allows the pixel to emit a predetermined color when all LEDs receive the same current. This simplifies LED driving and improves color consistency compared to using different currents for each LED color.

Source

Circuit for real-time adjustment and control of mixed LED light colors. The circuit uses a main control module to analyze and calculate mixed light information to obtain accurate chromaticity coordinates. This data is then used by the LED driver module to calculate precise chromaticity values for the LEDs to mix the light with more accurate colors. Additionally, the main control module can adjust the mixed light information in real-time for scene-specific color conversion needs. This allows more precise and dynamic mixed LED light color capabilities compared to fixed color LED arrays.

Source

Display device with improved color uniformity using multiple LED groups and adjustable driving currents. The display has multiple LED groups, each with LEDs in the same BIN range. Dedicated drivers connect 1:1 to each group. By adjusting the drivers' output currents, the LED groups' emission wavelengths can be matched to reduce color variation. This allows using LEDs from different BIN ranges in a display instead of all matching. It improves cost vs uniformity tradeoff compared to using same-BIN LEDs in each group.

Source

Low-power, high-brightness integrated color microLED display. The display is fabricated by a method involving growing a blue LED epitaxial layer on a sapphire substrate, patterning openings in the blue LED layer to expose the underlying substrate, forming ohmic contacts on the exposed substrate, and transferring the blue LED array onto a receiving substrate with drivers. A color conversion layer is added to change the blue light to other colors. This provides a compact, self-contained microLED display with integrated color conversion.

Source

Micro LED display system and method for improving dynamic range, power consumption, and color accuracy. The display has individually controllable subpixels in each pixel. This allows independent adjustment of emission time and duty cycle for each subpixel. This enables optimizing power consumption and color accuracy without affecting gamma. By dynamically adjusting subpixel emission times, it tunes display color without affecting gamma.

Source

Five-primary color LED display device with improved color gamut compared to traditional three-primary color displays. The display uses red, yellow, green, cyan, and blue LEDs. A control circuit with dimming allows independent adjustment of each primary color. This expands the display's color reproduction capabilities to better match real-world colors and meet high-end requirements for wide color gamut. The separate control of each primary color allows more accurate reproduction of a wider range of colors compared to just varying the intensity of the three primaries.

Source

Active display with increased color gamut using individually controllable RGB LED subpixels to overcome limitations of fixed color bins. The display has a pixel made of multiple RGB LED subpixels. Each subpixel has individually adjustable red, green, and blue LEDs. By varying the intensity of each LED, the pixel can output light in a wider color gamut than any individual subpixel LED could achieve on its own. This allows using more LEDs from a production batch to cover a desired display color space like DCI-P3 or Rec. 2020.

Source

Monolithic full-color LED display panel with improved color gamut and simplified fabrication compared to prior art. The panel has pixels with red, green, and red subpixels, where each subpixel uses a common multi-quantum well structure. The subpixel compositions are adjusted at different current densities to emit primary colors. A conversion layer changes the third subpixel's color. This allows full-color without color conversion layers or complex assembly. The common structure simplifies fabrication versus individual RGB LEDs.

Source

Color PLED display with individual color pixels to eliminate the need for separate red, green, and blue subpixels or color conversion. The display has micro LEDs with stacked layers emitting different colors. A blocking layer separates the color layers. By applying alternating voltage to drive the pixels, carriers are selectively compounded in each layer to emit the desired color. This avoids transferring and aligning multiple subpixels and simplifies manufacturing compared to traditional RGB displays.

Source

LED pixel device, display screen, and method that improves color accuracy and matches LED displays to video signals without losing color gamut. The LED pixel device has red, green, and blue LEDs with specific chromaticity ranges. The red falls between (0.682, 0.301) to (0.700, 0.299), green between (0.21, 0.65) to (0.28, 0.65), and blue between (0.136, 0.040) to (0.146, 0.056). This matching reduces color difference compared to standard LEDs. The display mixes the LED lights at predetermined ratios to create primary colors from the matched LEDs instead of trying to convert video primaries to LED primaries.

Source

A color-changing full-color LED pixel lamp with uniform color transition and improved durability. The lamp has a substrate with white light LEDs in the center and RGB LEDs on either side. An integrated lens covers all the LEDs. A microcontroller on the substrate controls the color temperature by adjusting the RGBW values. The integrated lens provides secondary light distribution for uniform color mixing. The lamp has a containing cavity with a lens window for exposed light. The substrate clips into the cavity and sealing glue fills gaps. The integrated lens and substrate are fixed to the cavity walls for protection.

Source

Micro LED display optimization technique to improve dynamic range, power consumption, and color accuracy. The technique involves independently controlling the brightness and duty cycle of each subpixel in a micro LED display. This is done by providing separate light-emitting control signals to each subpixel of each pixel in the array. The signals can independently control the light-emitting time and duty ratio of each subpixel. This allows more precise and optimized brightness control compared to driving the whole pixel. It also enables better color accuracy and gamma correction. By separately controlling each subpixel, it allows mixing of primary colors with different duty cycles to achieve desired white points. This mitigates the efficiency drop at lower currents seen in some micro LEDs.

Source

MicroLED display with reduced color shift between low and high brightness modes. The display uses subpixels with a wavelength conversion layer covering a lower current microLED and not covering a higher current microLED. In low brightness mode, the conversion layer emits light with colors close to the higher current microLED in high brightness mode, reducing color shift between modes.

Source

Micro LED color display structure with separate electrode addressing modules for each subpixel to precisely control color emission. The red, green, and blue subpixels are arranged in sequence on a transparent substrate. This eliminates the need for complicated transfer of discrete colored microLEDs, simplifying manufacturing and reducing defects compared to transferring pre-made microLEDs of different colors. The separate electrode modules allow independent driving of each subpixel using a driving circuit board.

Source

LED light source with adjustable color parameters and a method for adjusting the color parameters. The LED light source has separate white, red, green, and blue LED units. The color parameters like Duv, color temperature, CRI, and illumination can be precisely adjusted by controlling the output ratios of the individual LED units. This allows customized color performance for applications like signage and displays where accurate color is critical.

Source

Adjustable LED light source with precise color parameters for applications like displays and signage where accurate color is critical. The light source has separate white, red, green, and blue LED units that can be individually adjusted in output ratio by a control unit. This allows fine tuning of color parameters like Duv, color temperature, and color rendering index to match specific requirements. The separate LED units also enable customized spatial distribution for uniform illumination.

Source

A controllable arbitrary mixed light generating device that allows customizable generation of mixed light by independently controlling red, green, and blue LEDs. The device has a microprocessor connected to a network and PWM drivers for the LEDs. This allows precise control of LED brightness and mixing ratios via the microprocessor.

Source

Display system with pixels having sub-pixels with multiple heterogeneous light emitters to improve performance under varying viewing conditions. Each sub-pixel contains two different light emitters that have distinct attributes like color, brightness, efficiency, angular distribution, size, etc. By independently controlling the emitters, the display can optimize light output for different situations. For example, one emitter may have better contrast for dark scenes while the other provides better color saturation for bright scenes.

Source

Color-tunable LED emitter with high color rendering index (CRI) across a wide range of color temperatures. The emitter uses multiple independently addressable LED groups on a ceramic substrate, allowing the color to be tuned by adjusting the current supplied to each group. Some of the LED groups have broad-spectrum phosphor coating to improve CRI and R9 (red rendering) compared to narrow-band LEDs. This provides high CRI and R9 over the entire color temperature range.

Source

Color tunable LED module with multiple submodules and control to eliminate manufacturer color temperature binning. The module has multiple submodules, each with a blue LED and a different phosphor for a specific color emission (red, yellow, orange). This allows mixing the submodule outputs to tune the overall white color without sorting and binning LEDs. A control system adjusts the submodule intensities to achieve desired color points. The submodules are mounted on a high thermal conductivity substrate and encapsulated to isolate the phosphors. This prevents phosphor bleed between submodules. The encapsulant also improves light extraction and thermal isolation for better efficiency.

Source