Application Processor Power Management for Mobile Battery Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing data traffic between mobile application processors and display driver ICs, driven by improved image resolution, leads to rising power consumption, which shortens battery life in multimedia devices.
Innovation Solution
An application processor with a power management unit that adaptively controls power modes across multiple domains based on image signal characteristics and a power control overhead index, reducing power usage by operating in low power modes when displaying still images and switching to normal mode for moving images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the application processor operates in normal mode to handle high data traffic for improved image resolution, then display performance is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between normal mode and multiple low power modes based on the characteristics of the image signal (still image vs. moving image). The power management unit adjusts the operating mode in real-time, making the system adaptive to different display scenarios, thereby reducing power consumption while maintaining display performance when needed.
Solution Approach 2:
The invention changes operational parameters by introducing multiple low power modes with different power depths (first low power mode and second low power mode) instead of a single normal mode. The system selects appropriate power modes based on image signal characteristics, effectively changing the power consumption parameter while maintaining acceptable display functionality.
2Productivity
If the application processor uses multiple functional blocks to process multimedia data, then processing capability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The power management unit segments the control of different functional blocks by creating multiple low power modes that selectively activate or deactivate specific processing pathways. When displaying still images, the system can use a second low power mode that bypasses certain functional blocks, effectively segmenting the processing architecture to reduce power consumption while maintaining essential functionality.
Solution Approach 2:
The system periodically assesses the characteristics of incoming image signals and switches between normal mode and low power modes accordingly. This periodic evaluation and switching allows the processor to maintain high processing capability when needed (moving images) while conserving battery life during periods of lower demand (still images).
Data Source
AI summary
An application processor includes a memory controller, a display block and a power management unit. The memory controller controls an external memory that stores an image signal to be displayed on a display unit. The display block includes an internal frame buffer and a display controller and the display controller controls the image signal to be displayed on the display unit. The power management unit adaptively controls a power mode of the application processor based on a characteristic of the image signal to be displayed and a power control overhead index.