Service Life Extension in Micro-LED Displays

LED screen display correction method and system to improve display brightness and extend screen life. The method involves dynamically adjusting the temperature of the LED screen's light condensing elements instead of increasing luminous power when brightness decreases. This prevents high power consumption that shortens screen life. The method obtains the LED element parameters, calculates brightness attenuation and initial floating values, then corrects the floating value based on environmental factors. If brightness is still below target, the screen temperature is adjusted to compensate.

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LED chips with improved reliability, moisture resistance, and flexibility for additional features by using a passivation layer around the mesa sidewalls of the LED structure. The passivation layer, made of materials like silicon nitride, seals the LED mesa perimeter to prevent undercutting during etching and reduce moisture ingress. This allows for better reliability, reduced risk of damage, and the ability to add features like dielectric reflective layers and DBR reflectors to the chip.

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A method to improve display quality and reduce power consumption in electronic devices with displays that have pixels that can be individually controlled. The method involves determining decay rates for the pixels based on their luminance values. The luminance values for the pixels are adjusted based on their decay rates to compensate for aging and variability. This prevents image sticking, extends display life, and reduces power consumption.

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Compensating power supply voltage drop in MicroLED displays to improve brightness and color accuracy. The compensation involves detecting the voltage drop caused by current through off-chip resistors when the display is lit. This drop is compensated by adding an equal voltage to the control signal for the LEDs. The compensation can be done digitally using an algorithm or analog circuits. The algorithm involves establishing a model of the display and power supply to calculate the required compensation.

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Compensating the display junction temperature of LED digital tubes in electronic displays to prevent red shift and improve display quality. The method involves monitoring the surface temperature and current of the LEDs in the tubes. Based on the measured values, it calculates the junction temperature of the LEDs. If the junction temperature is too high, it adjusts the delay time of the display control signal to reduce switching losses and lower the junction temperature. This prevents redshift. It also extends the display control signal to avoid multiple simultaneous LED switches. This increases flux but risks afterglow. The extension time is calculated to balance these effects.

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Micro-LED display panel with redundancy to improve yield and reliability. The display has micro-LEDs arranged in sub-pixels on a driving substrate, with some sub-pixels containing two series-connected micro-LEDs of the same color. In normal sub-pixels, both LEDs emit light, but if one LED fails, only the working LED emits light. Redundancy positions allow extra LEDs to parallel connect if both originals fail. This compensates for failed LEDs and maintains full sub-pixel brightness. The redundancy prevents single LED failures from affecting display quality.

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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 micro-LED display that can sustain high brightness without overheating, which can lead to color degradation and reduced lifetime, is used. The display uses micro-caps to thermally insulate the tiny LEDs from the substrate. The micro-caps create sealed chambers around each LED that can be filled with gas or vacuum. This prevents heat buildup and protects the color conversion layers. The display also has color material layers on the micro-caps to enhance color performance.

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Display panel with improved luminous efficiency and longer device life without using lithium fluoride. The panel has a stacked inorganic packaging layer above the light-emitting device. The stack has three sublayers with refractive indices in specific order and difference. The middle sublayer has higher index than top and bottom layers. This enhances light reflection inside the microcavity to increase luminous intensity. It improves efficiency compared to two sublayer stacks. The three sublayer stack also better protects the device from water and oxygen compared to single or double stacks.

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Display panel with redundancy scheme incorporating micro-LEDs to enable high-resolution micro-LED displays with high yield and longer lifetime. The display panel includes an array of micro-LED devices in each pixel and multiple top electrodes to provide redundancy and repair capability for faulty micro-LEDs. This allows the detection and bypassing of defective micro-LEDs during panel manufacturing. The bottom electrodes are bonded to pairs of micro-LEDs that emit the same color. The top electrodes connect one micro-LED in each pair to the ground line. If a micro-LED is faulty, the other micro-LED in the pair compensates for it. The display also uses an integrated test method where imaging after transfer detects faulty micro-LEDs for replacement before passivation and top electrode formation.

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A method to prevent display brightness from decreasing below a target level as light-emitting diodes (LEDs) age. The method involves initially setting the LED output higher than the target brightness when the LEDs are turned on. This compensates for luminance loss due to aging. Subsequent brightness corrections account for both aging and initial overdrive. By starting higher, the LEDs can be replaced at the target lifetime even if they degrade faster from initial overdrive. This prevents brightness from dropping below the target.

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Dynamic power supply adjustment for microLED arrays to improve efficiency and reduce losses compared to fixed high voltage supplies. The power supply voltage is dynamically adjusted based on operating conditions like temperature and current amplitude to match the actual required voltage. This avoids excessive fixed voltage that wastes power in the current source and causes losses. The voltage adjustment is determined using data on the LED forward voltage and process spread.

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A display system with multiple displays that compensates for brightness variation between displays due to aging LEDs. The system has individual LED units for each display area. It tracks cumulative lighting time, initial brightness, and temperature for each LED. A control unit calculates estimated brightness based on this data and sets a common brightness level across the displays to balance brightness. This mitigates brightness differences between displays as LEDs age.

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Point-by-point brightness and chromaticity correction system for LED modules that compensates for temperature effects to improve display quality. The system involves adding a temperature sensor in the LED module. When the module is powered on, the temperature is read by an onboard MCU. This temperature is matched with pre-calculated correction coefficients for brightness and chromaticity at different temperatures. These coefficients are stored in the display controller and used for step-by-step correction of the LED module's pixels at different operating temperatures. This prevents temperature drift and color cast issues in LED displays.

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LED display device with brightness correction to maintain uniformity when LEDs degrade over time. The device calculates the cumulative lighting time of each LED, looks up the degradation rate from a table, and applies correction to LEDs with lower degradation. This prevents excessive brightness drop in aged LEDs while avoiding correction of severely degraded LEDs. The threshold for correction is set based on the average degradation rate. By selectively correcting based on degradation level, it preserves display uniformity as LEDs age.

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LED display device that prevents damage to the LED elements due to temperature changes when the display is turned on at high brightness without requiring a warm-up break-in procedure. The device calculates the brightness of each LED based on the video input, calculates the temperature rise for that brightness, and then controls a heater inside the display to generate the calculated temperature rise. This pre-heats the LEDs before they are turned on at high brightness, preventing moisture expansion and vaporization that can damage the LEDs.

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Optimizing the lifetime of LED displays like OLED and microLED screens by managing the luminance based on temperatures in different display areas. Sensors on the display, PCB, and adjacent components measure temperatures. A heat map is generated showing the hotspots. Luminance is adjusted for each area to compensate for higher temperatures and prevent premature aging. The heat map allows optimizing display brightness across areas with varying heat conditions.

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An LED display device with a correction method to maintain uniform brightness over time. The display has aging test sections with identical LEDs. Their brightness is measured, temperatures recorded, and accumulated usage time tracked. This data is used to calculate correction factors for each display LED based on its age and temperature. The display driver then applies these factors to correct the brightness of each LED element. This compensates for aging variations between LEDs. By using aging test sections, accurate correction factors can be calculated without stopping the display.

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Preventing damage to LED elements in displays when restarting after long periods of inactivity. The display system has a humidity sensor that monitors humidity levels when the display is powered off. This data is stored. When the display is restarted after a long off period, the stored humidity data is used to calculate a gradual brightness ramp for the LED elements. This prevents rapid heating and expansion of the sealing epoxy that can cause delamination and damage. By starting at reduced brightness and gradually ramping up, it prevents epoxy expansion and exfoliation when the display is restarted after extended off periods.

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A micro-LED display device provides high energy efficiency, wide viewing angles, and a long lifetime. The device consists of a micro-LED array, a light transmission layer, a color filter, and a polariser. An electrode layer drives the micro-LED array to emit light, which passes through the transmission layer, color filter, and polariser to create the display image.

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