Variable Refresh Rate Power Management for Display Systems
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Solution Overview
Problem
Portable data processing systems face challenges in managing battery life, as frequent display refreshes consume power and reduce battery endurance, especially when operating on battery power.
Innovation Solution
Implementing a power management system that adjusts display refresh frequency based on the current power mode, reducing refresh rate from 1/60th to 1/30th of a second when on battery power to conserve energy, while maintaining responsiveness by coalescing updates and discarding redundant ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display refresh rate is increased to improve responsiveness, then user experience is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The system dynamically adjusts the display refresh rate based on power source availability. When AC power is detected, the system operates at a higher refresh rate (e.g., 60Hz) for optimal responsiveness. When battery power is detected, the system automatically reduces the refresh rate to a lower value (e.g., 30Hz or lower) to conserve energy, thereby resolving the contradiction between responsiveness and power consumption through adaptive behavior
Solution Approach 2:
The invention changes the operational parameters of the display system by modifying the refresh rate parameter in response to power source changes. The system monitors power source status and adjusts the refresh rate parameter accordingly, switching between different operational states (high refresh rate for AC power, low refresh rate for battery power) to optimize the balance between performance and energy consumption
2Duration of action of moving object
If the display refresh rate is reduced to conserve power, then battery life is extended, but display responsiveness deteriorates
Solution Approach 1:
The system employs dynamic adjustment of display refresh characteristics based on power source detection. When transitioning to battery power mode, the system reduces refresh rate to extend battery life. When AC power becomes available, the system automatically restores the higher refresh rate, ensuring that responsiveness is maintained when power is abundant while conserving energy when running on battery
Solution Approach 2:
The invention modifies the display refresh rate parameter based on power source conditions. By detecting the power source type (AC or battery), the system changes the operational parameter of the display to appropriate values, achieving extended battery life during battery operation while maintaining the ability to restore full responsiveness when connected to AC power
Data Source
AI summary
A data processing system refreshes a display at a first frequency when operating in a first power mode. The data processing system refreshes the display at a second frequency when operating in a second mode. The first frequency is higher than the second frequency, and the second power mode is configured to consume less power than the first power mode.