Active Matrix Control for Micro-LED Displays

LED display system that improves color depth without losing data integrity. It allows increasing the bit depth of display data beyond what the receiving card can handle, without risking lost data during transmission. The key is having the driving devices themselves convert color depth instead of the control unit. This reduces the load on the control unit and allows it to transmit lower bit depth data while still getting higher color depth displays. The driving devices pre-store gamma mapping tables for color depth conversion. This allows consistent color performance across multiple driving devices, even with varying pixel counts. The control unit just sends base display data and configuration info to the driving devices, which handle the color conversion internally.

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LED pixel driving circuit and driving method that improves brightness uniformity and expands input voltage range for precise gray scaling. The circuit uses 7 NMOS transistors, 2 capacitors, and LEDs. It compensates for threshold voltage variations in the transistors that affect LED current by extracting the threshold voltages, offsetting them, and then driving the LEDs. This reduces LED current variation and improves brightness uniformity. The circuit also uses capacitive coupling to expand the input voltage range.

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Display driving device and method capable of fine-grained brightness control using a dummy signal. It generates a dummy clock signal based on the PWM duty ratio and uses it along with the PWM clock signal to control the brightness of LED pixels. This allows finer adjustment of LED emission time compared to using just the PWM clock signal.

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Display device and control method to reduce LED stress and increase lifespan by adjusting the voltage applied to the LED based on the input image data. It analyzes the required voltage to make the LED emit light from the image data and compares it to a reference value. If the required voltage is below the reference, it sets a higher voltage level. This prevents applying low voltages that can stress the LED. The driving ICs are then controlled based on the determined voltages to apply the adjusted levels to the LEDs. This avoids applying excessively low voltages when displaying black or low grayscale images.

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Active mini LED display with improved uniformity and reduced image sticking by using multiple transistor circuits in each pixel. The display has mini LEDs with separate transistors for red, green, and blue subpixels. This allows independent driving and compensation to mitigate uniformity and degradation issues. The pixels are arranged in a matrix with scanning and channel signals. Each pixel has a mini LED with separate transistors for red, green, and blue subpixels. The subpixel transistors have gates connected to the channel signal and sources connected to the scanning signal. The pixel outputs are connected together and scanned. This allows independent driving and compensation of the subpixels to improve uniformity and reduce image sticking compared to common cathode or anode configurations.

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LED display screen with improved low gray level performance to mitigate issues like color cast, inaccurate grayscale and flickering. The display has a substrate with pixel units on one side and a driving unit on the other. The pixels have red, green and blue subpixels stacked vertically. The driving unit connects to the red and green subpixels. The control method involves setting grayscale data, a low threshold, and comparing subpixel data to trigger a timing control signal. The driving unit then lights the subpixels in sequence based on the timing. This allows accurate low grayscale display without issues like color cast or flickering.

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LED display system that improves image quality by reducing coupling interference between LEDs. The system uses control signals to mitigate issues like false lighting and faded images. The signals include: 1) an anti-coupling control signal to prevent LEDs from lighting when grayscale is zero; 2) a first-row compensation control signal to boost brightness of the first row; and 3) a clamping voltage control signal to fix LED voltage after display. These signals are generated based on grayscale detection of the image data.

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Grayscale distribution control circuit for LED displays that eliminates pitting in low grayscale images. The circuit generates an SPWM signal based on display data and configuration signals to control the conduction time of LED elements in each subframe. It uses a lookup table to assign specific grayscale values to each subframe instead of just 1 in some cases. This ensures the LEDs have enough on-time to fully brighten even at low grayscale levels, preventing pitting.

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Chip structure for high density and brightness micro LED displays that reduces the need for external driver ICs. The chip integrates the LED elements, MOSFETs, and connections on a package substrate. It has an input voltage pad, a main control circuit, and a source drive circuit. The main control circuit drives the MOSFETs which in turn source-drive the LEDs. This allows high density and brightness micro LED displays without needing external driver ICs, as the MOSFETs are integrated on the chip.

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Active Micro-LED uniformity compensation method and display device to mitigate brightness non-uniformity in microLED displays. The method involves splitting the grayscale levels into high and low bit widths based on a threshold. The high bit width data is displayed using subframe doubling where each frame is divided into N subframes and the high bit width data is spread across them. This reduces the impact of leakage current that builds up during long displays. The low bit width data is dispersed across rows using sub-row synchronization signals. This reduces the non-uniformity from short displays with insufficient time to settle. The method provides consistent brightness across grayscales with microLEDs.

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Display device architecture and driving method to mitigate current spikes when driving large numbers of microLEDs simultaneously. The display has multiple areas, each with its own microLED driver circuit. The timing control circuit generates irregular timing signals for each area's drivers. This allows staggered driving of scan lines within an area instead of simultaneous driving. This spreads the current demand across multiple times, preventing large instantaneous current spikes that can damage components.

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MicroLED display panel and pixel driving circuit to improve efficiency, brightness, and gray levels. The driving circuit has a switch, driving unit, and selection unit. The switch controls data based on scan. The driving unit connects to the light-emitting microLEDs and first voltage. The selection unit connects to microLEDs, second voltage, and receives selection signal. Brightness and number of microLEDs lit are controlled by selection and driving based on selection/data. This allows partial microLED strings to be lit instead of all, improving efficiency. By selectively driving subsets, it increases brightness and enables more grayscales compared to driving full strings.

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Common-anode microLED display devices with improved efficiency and smaller driver size compared to conventional common-cathode designs. The common-anode microLEDs are driven by positive voltages from regulators instead of negative voltages. This avoids complex negative supply circuits and allows using smaller, less power-hungry n-channel transistors for the current drivers. The microLED arrays are bonded with metal-to-metal contacts to the backplane circuits, simplifying alignment. The common anode is deposited after etching the mesa structures. This allows precise alignment and bonding of the anode pads on the microLEDs to the backplane driver pads.

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Display driver integrated circuit that dynamically adjusts driving parameters based on pixel gray levels to improve display quality. The driver circuit checks the gray scale value of each pixel and dynamically adjusts parameters like current, refresh rate, and slew rate for each pixel. This allows optimizing driving parameters for low vs high grayscale values to balance issues like dimness, coupling, and blanking time.

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Active Micro-LED display control system that enables high grayscale display for Micro-LED displays using FPGA boards to overcome limitations of existing driver ICs. The system has multiple FPGA boards, each intercepting video data and generating PWM signals. A synchronization module ensures simultaneous PWM output from all boards. This allows flexible grayscale correction beyond 8 bits and accommodates Micro-LED display variations.

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Improving display quality of LED screens by optimizing current and grayscale control for individual pixels. Instead of uniformly adjusting the entire screen, the method determines the optimal current and grayscale levels for each pixel based on its address. This allows higher grayscale accuracy and visibility at low currents. The display controller acquires the current grayscale for a target pixel, then determines the optimal target grayscale and current based on the original grayscale. These values are sent to the corresponding pixel driver chip to control that pixel's LEDs. This enables customized, high-resolution grayscaling at low currents for each pixel.

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Active Micro-LED display control system that enables uniform low-gray display and high-gray scaling for Micro-LED screens. It uses a main board with a processor and a traditional AMOLED driver IC to separate PAM and PWM control signals. The AMOLED IC provides PAM signals for fine grayscale, while the main board generates PWM signals. A synchronization signal from the AMOLED IC ensures timing. The system also includes a separate SWEEP signal generation module. The AMOLED IC divides/multiplies clock frequencies to generate GOUT1, GOUT2, and GOUT3 signals. The GOUT1 SWEEP signal is sent to the display for low-gray uniformity.

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Pixel design for displays with reduced power consumption and improved image quality in randomly aligned light-emitting element arrays. The pixel has two electrodes connected to light-emitting elements and two pixel circuits. One circuit is connected to a power source and generates the driving current based on scan and data signals. The other circuit is connected to a second power source. Electrical connections between the circuits and electrodes are selectively controlled based on signals. This allows opposite power sources for electrodes based on the alignment ratio of the elements. Reduces voltage difference and power consumption.

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Reducing pixel pitch of microLED displays by separating the microLED array from the drivers to allow closer packing of the microLEDs. The microLEDs are on one side of a substrate and the drivers are on the other side. Conductive paths in the substrate connect the microLEDs to the drivers. This allows smaller pixel sizes compared to having the drivers on the same side as the microLEDs. A separate data driver provides scan and PWM signals to the matrix drivers.

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Reducing pixel pitch of microLED displays by separating the driver circuitry from the microLED array. The microLED matrix is on one side of a substrate and driver circuits are on the other side. Conductive paths in the substrate connect the microLEDs to the drivers. This allows reducing pixel size beyond the microLED size limitation. A separate driver circuit provides scan and PWM signals to the matrix drivers. The matrix drivers then control the microLEDs based on the scan and PWM signals.

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