Driver Circuits for Micro-LED Displays

Reducing the disturbance of driving channels in a self-luminous display panel from affecting the Gamma voltage by dynamically routing the output of the channels during scanning. Multiple Gamma voltage circuits generate groups of Gamma voltages. Each channel converts sub-pixel data using its assigned Gamma voltage. A routing circuit connects channel outputs to data lines during scanning. It switches connections between channels and data lines during scans to prevent simultaneous channel outputs from interfering with Gamma voltage stability.

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Pixel driving circuit for displays that provides real-time compensation with a larger range compared to external compensation. The circuit has a light-emitting module, an external detection module, and an internal compensation module. The external module detects threshold voltage shift at startup, and the internal module compensates differently based on the detected shift direction. This allows dynamic, internal compensation with improved accuracy and range compared to external compensation.

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Driving method for gate drivers in displays that reduces charging time of pixels far from the driver to improve uniformity. The method involves ramping the gate signal more steeply during turn-on by transitioning from a lower potential to a higher potential in a shorter time. This allows faster charging of distant pixels. The ramping sequence is: low potential -> higher potential -> even higher potential, all within a fixed time. This charges the pixels faster because the ramp duration is shorter compared to a normal linear ramp. After turn-on, the gate signal returns to the original low potential, then back to low again for turn-off.

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Display panel, source driver chip, and electronic device with improved uniformity in displayed images in ODDC-compensated displays. The display has two areas with subpixels connected to different source driver chips. To mitigate image non-uniformity caused by resistance differences in the ODDC delay modules, the second source driver chip has an additional compensation module connected to the second subpixels and delay module. This compensation module adjusts voltages based on the delay module parameters to compensate for resistance differences between the first and second driver chips.

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Micro LED display device with improved color reproduction and driving circuitry. The display uses a micro LED panel with self-emissive pixels. Each pixel contains multiple micro LEDs. The driving circuit for each micro LED has two stages: a PWM stage adjusts light emission duration and a CCG stage provides constant current during emission. This allows expressing grayscale by fixing current and adjusting time, avoiding wavelength shift issues of PAM driving. The display uses a row-scanning architecture with separate subpixel circuits for each micro LED. The main driver sets row voltages and sweeps to drive the pixels.

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Reducing flickering in displays with alternating polarity frames by using a compensation module to stabilize subpixel voltages between frames. The compensation module connects to the data lines and injects compensation voltages with the same polarity as the data voltages into the subpixels during blank periods. This reduces voltage differences and leakage during blank intervals, preventing significant brightness changes between frames.

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Multi-branch linear LED driver that provides smooth switching and reliable operation for multiple strings of LEDs. The driver has a control circuit that individually manages each branch based on detection of the branch status. A comparator circuit detects if a branch is normal or abnormal based on a threshold voltage difference. The control circuit then adjusts the branch operation accordingly. The comparator output slope is adjusted to make branch switching gentle. This prevents abrupt current changes that could damage the LEDs.

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LED display module and screen that use high voltage to reduce energy consumption compared to standard low voltage displays. The modules have LEDs laid equally on the PCB board, driven by high voltage chips. This allows using higher voltages than the typical 5V for LED displays. The higher voltage reduces the current through the LEDs and PCB wiring, reducing power loss and heat generation compared to low voltage displays.

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LED driver, lighting system and display device for optimizing supply voltage to improve efficiency. The LED driver has a feedback current source that generates a feedback current based on the headroom voltage of the LED driver. This feedback current is derived from the supply voltage. The LED driver compares the headroom voltage with a reference and adjusts the feedback current accordingly. Multiple LED drivers in a lighting system can share a feedback pin to derive feedback currents. The supply voltage is adjusted based on the feedback voltages. This closed-loop feedback helps stabilize the supply voltage and maximize LED driver efficiency.

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LED driving module and method for backlight units that reduces heat generation in the module and overall panel by controlling the current through the LED array based on the input voltage. The module has a boost circuit to amplify the input voltage, a voltage monitoring circuit to compare the input and reference voltages, and a current control circuit to set the LED driving current based on the comparison. This allows adjusting the LED current based on input voltage to prevent overload and reduce heat in the boost circuit and panel.

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An energy-saving circuit for LED displays that reduces power consumption and heat generation of the constant current driver chips. The circuit is used in RGB LED displays with common anode connection. The circuit includes a power module, two constant current drive modules, and a buck converter. The red, green, and blue LED anodes connect to the power module. The red LED cathode connects to the first constant current drive module. The first buck converter connects to the first constant current drive module output and ground. The green and blue LED cathodes connect to the second constant current drive module inputs. This configuration raises the voltage level at the first constant current drive module using the buck converter, reducing its voltage drop and power consumption.

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LED driving device that can directly regulate current and has power supply and temperature monitoring functions. The device aims to improve LED lifetime and reliability by providing quick current adjustment, voltage monitoring, and temperature monitoring. It uses a current mirror to directly regulate the LED current instead of resistors. A reference source provides stable voltages and currents. Monitors check reference voltage, power supply, and temperature to prevent issues like reference voltage drop, excessive voltage, and overheating.

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Control system and method for LED driver to optimize efficiency and reduce heat generation by maintaining constant current while minimizing voltage applied to the LEDs. The system has two control units, one to provide driving current to the LEDs and the other to adjust the bias voltage based on the current. This allows using lowest voltage to optimize efficiency while maintaining constant current.

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LED array drive circuit for displays that integrates the control and driving functions into a single chip to simplify design, reduce circuit board area, and improve reliability compared to separate control and driver chips. The integrated circuit has a control module that writes data into the driving module. The driving module then uses that data to control the LED array's brightness. This integrated approach allows miniaturization of LED displays by reducing the overall solution size.

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Low transition voltage LED display drive circuit that reduces power consumption and improves display quality by using current mirrors and feedback control to lower the turning voltage. The circuit has a reference voltage generation module and a constant current output module. The reference current generating circuit uses current mirrors formed by N-type MOS tubes to stabilize the output current. A feedback loop with operational amplifiers adjusts the output further. This reduces the transition voltage compared to traditional circuits.

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Micro-LED display with stacked multi-color pixels and an integrated driver circuit for high-resolution displays with compact pixel sizes and reduced power consumption. The display has a normal driver circuit and a pixel structure where red, green, and blue sub-pixels are stacked on top of each other. The sub-pixels are electrically connected to the driver circuit through metal wires. The stacked pixel design reduces pixel size while still providing full-color capability. The pixels are fabricated by growing and stacking layers for each sub-pixel color, then cutting and connecting them to the driver circuit.

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Simplified, low-cost LED constant current driver circuit that provides stable current and reduces temperature sensitivity compared to conventional circuits. The circuit uses separate voltage limiting and temperature compensation modules to maintain constant current and reduce temperature effects on the LED driver module. The voltage limiter clamps the voltage at the driver output to a fixed level. The temperature compensator adjusts the driver input voltage based on ambient temperature to counteract temperature effects. This allows keeping the driver output current stable and reduces temperature sensitivity compared to direct feedback-based current regulation.

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Self-adaptive constant current driving circuit for LED displays that eliminates the need for multiple power supplies when driving RGB LEDs with common cathode structure. The circuit has an adaptive constant current driving chip with a voltage feedback loop that adjusts the drive voltage to prevent excessive voltage drop in the constant current driver. The feedback loop collects the working voltage of the driver and compares it to a threshold. If it's too high, it adjusts the drive frequency to lower the voltage. This prevents excessive heat and power consumption in the drivers.

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Display panel with improved heat dissipation for micro-LEDs to avoid efficiency loss and extend lifespan. The panel has pixel units with driving circuits between the substrate and light-emitting components. For units with micro-LEDs, the circuit includes a thin-film transistor connected to a metal structure. This forms a heat dissipation path from the micro-LED to the metal layer away from the substrate.

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A display driver architecture for micro-LED displays that reduces pixel pitch and increases bit depth with shared circuitry to improve performance and manufacturability. The architecture uses a macro-pixel design with multiple pixels sharing circuits like comparators and leveraging contiguous layout regions to reduce transitions. This allows fitting more bit cells and additional logic in the same area. By grouping circuits, using standard bit cells, and sharing certain components, it enables higher bit depths per pixel in dense micro-LED arrays.

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