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 power supply voltage to ensure operation across all conditions.
Innovation Solution
A dynamic power supply control system that adjusts the power 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 specific voltage needed for each micro-LED array, thereby optimizing power usage and reducing thermal issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high voltage is used to ensure operation across all production spreads and temperatures, then reliability is improved, but energy loss increases
Solution Approach 1:
The patent implements a dynamic voltage regulation system that adjusts the supply voltage in real-time based on actual operating conditions. The controller monitors temperature and current amplitude, then dynamically modifies the voltage level to match the minimum required voltage for current operation, eliminating the waste associated with fixed high voltage while maintaining reliable operation across varying conditions.
Solution Approach 2:
The system changes the voltage parameter dynamically rather than maintaining a constant value. By retrieving process data and using sensors to determine the specific voltage needed under current conditions, the system optimizes energy use by matching voltage to actual requirements, thereby reducing power losses while ensuring operation across production spreads and temperature variations.
2Reliability
If a fixed high voltage is used to ensure operation across all temperatures, then reliability is improved, but thermal issues worsen
Solution Approach 1:
The patent incorporates a feedback mechanism where temperature sensors continuously monitor the actual operating temperature and current amplitude. This information is fed back to the controller, which then adjusts the supply voltage accordingly. This closed-loop control prevents overheating by ensuring voltage is never higher than necessary, thereby maintaining reliability while minimizing thermal issues.
Solution Approach 2:
The system dynamically adjusts voltage based on real-time temperature conditions rather than using a static high voltage setting. This dynamic regulation prevents excessive heat generation by matching voltage to actual operational needs across varying temperatures, resolving the contradiction between reliability and thermal management.
3Ease of manufacture
If PWM control with fixed current amplitude is used, then manufacturing simplicity is improved, but energy efficiency worsens
Solution Approach 1:
The patent extends PWM control by adding dynamic parameter changes to the fixed current amplitude. The system now adjusts both voltage and current amplitude based on operating conditions while maintaining the simplicity of PWM-based control architecture. This allows the system to achieve better energy efficiency without fundamentally complicating the manufacturing or control implementation.
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.