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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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