Dynamic Frame Rate Control for Display Power Optimization
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Solution Overview
Problem
Display panels without integrated frame buffers face challenges in power management due to high refresh rates, leading to increased bandwidth and power consumption, especially in mass market panels where frame buffer integration is not feasible.
Innovation Solution
Implementing a method to detect unchanging images and send only the first frame over a display interface, causing a link shutdown to reduce power consumption, while gradually adjusting the refresh rate to conserve power and minimize flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the refresh rate is increased to maintain image quality, then image stability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the frame rate adjustable based on image content characteristics. The system dynamically selects between different frame rates (e.g., 60Hz for changing images, 1Hz for static images) to optimize the balance between image stability and power consumption, rather than using a fixed refresh rate
Solution Approach 2:
The patent changes the temporal parameter (frame rate) based on the detected image characteristics. By monitoring whether images are static or dynamic and adjusting the frame rate accordingly, the system optimizes power consumption while maintaining adequate image stability for the current content type
2Use of energy by moving object
If the frame rate is reduced to conserve power, then power consumption decreases, but image update responsiveness deteriorates
Solution Approach 1:
The system dynamically adjusts the frame rate based on real-time detection of image content changes. When static content is detected, the frame rate is reduced to conserve power; when dynamic content is detected, the frame rate increases to maintain image update responsiveness, creating an adaptive system that balances both requirements
Solution Approach 2:
The patent implements periodic image change detection and frame rate adjustment. Instead of continuous high-rate updates, the system periodically checks for image changes and adjusts the transmission rate accordingly, reducing power consumption during static periods while maintaining responsiveness when changes occur
3Use of energy by moving object
If an integrated frame buffer is added to reduce refresh rate, then power consumption decreases, but device complexity increases
Solution Approach 1:
The patent extracts the frame buffering function from dedicated hardware (integrated frame buffer) and implements it through software-based detection and control mechanisms. By using image change detection algorithms and dynamic frame rate adjustment in the processing system, the patent achieves frame buffer-like power savings without adding physical memory components to the display panel
Solution Approach 2:
The patent introduces an intermediary image change detection mechanism between the image source and display panel. This intermediary layer analyzes image content and controls the transmission timing, enabling reduced refresh rates without requiring integrated frame buffer hardware in the display panel itself
Data Source
AI summary
A frame of pixel data may be burst at a higher frame rate to create a lower effective refresh rate when the actual image update rate is lower than the frame rate. This results in the ability to power manage the transmit portion of the display engine and the receive portion of the panel electronics, while reducing display initiated repetitive memory traffic to conserve power.