Active Matrix Control for Micro-LED Displays

Method for improving display stability and fault tolerance in LED displays by compensating for faulty LEDs in real-time. The method involves detecting faulty LEDs, interpolating their display data to fill in the gaps, compensating the interpolation errors with cross-frame correlation, dynamically adjusting brightness to smooth transitions, and driving the LEDs with the compensated data. This allows faulty LEDs to be seamlessly compensated without impacting overall display quality.

Source

LED display device with improved image quality and reduced display separation between sections. The LED display has multiple control circuits serially connected to a system-on-chip (SOC). The SOC sends the full image data to each control circuit in sequence. Each control circuit generates drive signals for its connected driving circuits based on the received image data. This allows each control circuit to process the entire image, reducing separation compared to splitting image data. The serial connection enables synchronization and timing adjustment for consistent display.

Source

LED display device with improved image display and reduced complexity compared to conventional LED displays. The LED display uses a serial connection between a central SOC and multiple control circuits. The SOC sends the entire image data to each control circuit sequentially. Each control circuit generates local drive signals for connected drives based on the full image data. This allows each control circuit to process and adjust the image data. It eliminates the need for splitting image data at the SOC. This reduces separation between displayed areas and improves overall image quality.

Source

Reducing power consumption of LED display screens by dynamically adjusting the driving current based on the displayed image content. The method involves detecting grayscale levels of the image data and selectively turning off current sources for channels with low grayscale values. This allows reducing power during display of bright images with few low grayscale areas compared to traditional methods that only save power during black screens. The selective current source turn-off is done in the driving device connected to the LED lamp beads. The method aims to improve power efficiency of LED displays while maintaining image quality.

Source

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.

Source

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.

Source

Reducing the bit width of display data transmitted between an LED display control terminal and cascaded LED module groups to allow driving more LED modules under the same bandwidth and increasing the display area that can be loaded by communication. The method involves gamma correcting the display data to gray scale, compressing the gray scale to a smaller bit width, sending the compressed data to the LED modules, and decompressing back to gray scale for LED driving. The compression reduces the bit width between the terminal and modules, allowing more modules to be driven with the same bandwidth.

Source

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.

Source

A driving circuit for LED displays that improves consistency of low grayscale display by amplifying low duty cycle PWM data and reducing the current in proportion. This increases the on-time of the LEDs when the current is reduced, which compensates for slower response times of analog circuits. By making the increased on-time greater than or equal to the dynamic response time of the analog circuits, the LEDs can still display at low grayscale levels without issues. This improves consistency of ignition and reduces "glow" effects compared to directly reducing the current.

Source

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.

Source

Grayscale distribution control circuit for LED displays that can evenly distribute grayscale levels over subframes of varying lengths. It is integrated into an LED display driver chip and generates PWM signals for controlling LED brightness. The circuit takes display data and configuration signals to generate PWM signals for each subframe with adjusted duty cycles based on the grayscale values. This allows arbitrary grayscale distributions over any number of subframes, unlike conventional PWM methods that divide grayscale evenly between subframes. The circuit can be implemented as a digital circuit or algorithm in the driver chip to provide flexible grayscale distribution for LED displays.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

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.

Source

Driving circuit and method for LED displays that improves consistency of low grayscale display. The circuit amplifies low grayscale duty cycle data and proportionally reduces the current. This increases the on-time of the constant current source beyond its dynamic response time. This allows the simulated current source to work normally at lower currents, avoiding inconsistent ignition and improving low grayscale LED display consistency.

Source