LED Voltage Control for Display Lifespan Extension
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Solution Overview
Problem
Inorganic light emitting diode (LED) displays experience stress and reduced lifespan due to continuous application of voltage during low grayscale image display, leading to potential line defects.
Innovation Solution
A display device and control method that dynamically adjust the voltage applied to LEDs based on image data, applying a second, preset voltage when the image data indicates low grayscale or black, thereby reducing stress on the LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is continuously applied across LED terminals during low grayscale image display, then the LED can maintain stable operation and display, but the LED experiences stress and lifespan is shortened
Solution Approach 1:
The patent implements periodic voltage application by alternating between charging and discharging operations. During the charging operation, voltage is applied to the LED terminals; during the discharging operation, voltage is released. This periodic action allows the LED to display image data while reducing continuous stress, thereby extending LED lifespan without sacrificing display continuity.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on image data characteristics. When low grayscale image data is detected, the controller adjusts voltage parameters to reduce stress on LEDs. The system modifies voltage levels and application timing based on the specific requirements of the displayed image, optimizing both display quality and LED durability.
2Reliability
If steady discharging and charging operations are performed to control voltage, then voltage at LED terminals can be controlled, but reverse voltage stress is applied to LEDs during low grayscale display
Solution Approach 1:
The controller receives image data and analyzes it to determine appropriate voltage control strategies. Based on this feedback, the controller selectively applies charging and discharging operations, adjusting voltage parameters in real-time to minimize reverse voltage stress on LEDs while maintaining proper display functionality.
Solution Approach 2:
The voltage control system transitions from static to dynamic operation. Instead of applying constant voltage or fixed charging/discharging cycles, the system adapts its voltage control behavior based on real-time image data analysis, dynamically adjusting operation parameters to reduce stress during low grayscale display while maintaining control effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively extends the lifespan of LEDs by reducing stress and preventing line defects associated with continuous reverse voltage application during low grayscale image display.
Implementation Method 1
an organic light emitting diode display that uses organic materials based on an electroluminiscence effect by which a fluorescent organic compound emits light when a current is applied to the fluorescent organic compound
Implementation Method 2
a discharging operation to control a voltage at an anode of the LED terminals by discharging a capacitor connected in parallel with the LED terminals and a precharging operation to control a voltage at a cathode of the LED terminals by charging the capacitor
Data Source
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AI summary
A display device is provided. The display device includes a light emitting diode (LED) module including a plurality of LEDs; a plurality of driving integrated chips (ICs), each of the plurality of driving ICs being configured to apply voltages to a corresponding group of the plurality of LEDs; and a controller. The controller is configured to identify a first voltage corresponding to a first LED from among the plurality of LEDs based on image data, identify a first LED driving voltage as the first voltage or a second voltage based on the first voltage and a reference value, and control a first driving IC, from among the plurality of driving ICs, that corresponds to the first LED based on the first LED driving voltage.