Micro-LED Pixel Array Voltage Control for Power and Heat Loss
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Solution Overview
Problem
Conventional micro-LED arrays using PWM control face inefficiencies due to fixed supply voltage, leading to excessive power losses and thermal issues, as the minimum required voltage varies with production spread and temperature, necessitating a higher-than-needed voltage to ensure operation across all conditions.
Innovation Solution
A dynamic power supply control system that adjusts the supply voltage based on real-time operating conditions, including temperature and current amplitude, by retrieving process data during production and using sensors to determine the optimal voltage for each micro-LED array, thereby reducing energy waste and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high supply voltage is used to ensure operation across all production conditions, then reliability is improved, but energy loss increases
Solution Approach 1:
The patent implements dynamic voltage regulation by adjusting the supply voltage in real-time based on actual operating conditions (temperature, current amplitude) rather than using a fixed high voltage. The control system continuously monitors conditions and modulates the voltage to the minimum required level, transforming the static voltage supply into a dynamic one that adapts to changing requirements.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on operating conditions. By retrieving process data and using sensor feedback, the system determines the optimal voltage level for current temperature and current amplitude conditions, thereby changing the voltage parameter from a fixed value to a variable that adapts to operational requirements.
2Reliability
If a fixed high supply voltage is used to ensure operation across all temperatures, then reliability is improved, but thermal issues worsen
Solution Approach 1:
The patent incorporates temperature sensing and feedback control. Temperature sensors monitor the actual operating temperature, and this information is fed back to the voltage regulation system. The system uses this feedback to adjust the supply voltage appropriately, reducing voltage (and thus power dissipation and heat generation) when temperatures are already high, while maintaining reliable operation when temperatures are lower.
3Device complexity
If PWM control with fixed current amplitude is used, then manufacturing complexity is reduced, but energy efficiency deteriorates
Solution Approach 1:
The patent extends PWM control by adding dynamic current amplitude adjustment in addition to duty cycle modulation. The system retrieves process data and uses sensor feedback to determine optimal current amplitude levels for different operating conditions, thereby changing the current parameter dynamically. This dual-parameter control (duty cycle + current amplitude) improves energy efficiency while maintaining manageable system complexity.
Data Source
AI summary
A lighting system includes an LED array having a plurality of LED pixels and a power controller. The power controller adjusts a supply voltage for powering the LED pixels based on one or more conditions of the LED array. The power controller may determine the supply voltage based on process data of the LED array. The power controller may adjust the supply voltage based on an operating temperature of the LED pixels and the amplitude of a current driving the LED pixels.