Electronic Display Adaptive Refresh Rate Power Reduction
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Solution Overview
Problem
Electronic displays face challenges in reducing electrical power consumption while maintaining perceived image quality, particularly when displaying video content, as the refresh rate affects both power consumption and image quality.
Innovation Solution
The electronic display determines and uses multiple discrete refresh rates based on the capture rate and cadence of the video content, such as switching between 30 Hz and 60 Hz, to reduce power consumption without affecting the perceivable duration of each image frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high refresh rate (e.g., 60 Hz) is used to display video content, then perceived image quality is maintained, but electrical power consumption increases
Solution Approach 1:
The display system dynamically adjusts the refresh rate based on the video content's frame rate and motion characteristics. Instead of using a fixed 60 Hz refresh rate, the system varies the refresh rate to match the content requirements, using lower refresh rates for static or low-motion content and higher refresh rates for high-motion content, thereby reducing power consumption while maintaining perceived image quality when appropriate
Solution Approach 2:
The system changes the refresh rate parameter based on the input video content characteristics. By detecting the frame rate and motion levels of the video content, the system adjusts the refresh rate parameter to optimize the balance between power consumption and image quality, using lower refresh rates (e.g., 30 Hz) for content that does not require high refresh rates
2Use of energy by moving object
If a lower refresh rate is used to reduce power consumption, then electrical power consumption decreases, but perceived image quality may deteriorate
Solution Approach 1:
The system dynamically selects between different refresh rates (e.g., 30 Hz or 60 Hz) based on real-time analysis of video content motion characteristics. For low-motion content, a lower 30 Hz refresh rate is used to save power, while for high-motion content, the system switches to 60 Hz to maintain image quality, making the optimal choice adaptive to content requirements
Solution Approach 2:
The video content is effectively segmented into different motion regions or time periods, allowing different refresh rates to be applied to different segments. The system identifies portions of video content that benefit from lower refresh rates and applies 30 Hz only to those segments, while maintaining 60 Hz for portions requiring higher refresh rates
3Adaptability or versatility
If telecine pulldown techniques are used to convert video content data for fixed refresh rate displays, then compatibility with fixed refresh rate displays is achieved, but power consumption increases due to repeated frame writing
Solution Approach 1:
The system dynamically determines whether to use telecine pulldown conversion based on the display type and content characteristics. For variable refresh rate displays, the system may bypass traditional telecine conversion and instead directly adjust the refresh rate to match the content frame rate, eliminating unnecessary repeated frame writes and reducing power consumption while maintaining compatibility
Data Source
AI summary
Systems and methods for controlling operation of an electronic display are provided. One embodiment describes an electronic display, which includes a display driver that writes image frames to pixels of the electronic display with a first refresh rate or a second refresh rate; and a timing controller that receives a plurality of image frames from an image source, in which the plurality of image frames are displayed on the electronic display to play video content; detects a cadence with which the plurality of image frames are received from the image source; and, based at least in part on the cadence of the plurality of image frames, instructs the display driver to write each of the plurality of image frames either as a single image frame at the first refresh rate or an image frame at the first refresh rate followed by a repeat of the image frame at the second refresh rate.