Adaptive Display Refresh Control for Low-Frame-Rate Power Saving
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Solution Overview
Problem
Existing terminal devices face high power consumption due to inconsistent screen refresh rates and application frame rates, particularly in scenarios with low frame rates such as video or camera scenarios, leading to inefficient power usage.
Innovation Solution
A display driver chip adaptively adjusts the refresh rate based on the presence of images to be displayed, skipping image refresh from the cache when no new image is transmitted, reducing the frequency of image refreshing and thus power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display screen refreshes at a high fixed rate, then the display smoothness is improved, but the power consumption increases
Solution Approach 1:
The display screen dynamically adjusts its refresh rate based on whether new image data is available. When new images are transmitted, the screen refreshes at a higher rate to maintain smoothness; when no new images are available, it reduces the refresh rate to save power, thus making the refresh rate adaptive rather than fixed
Solution Approach 2:
The refresh rate parameter is changed based on the availability of new image data. The system switches between different refresh rate values (e.g., 60Hz, 90Hz, 120Hz) depending on whether the display driver has new composited images to transmit, optimizing the balance between smoothness and power consumption
2Speed
If the display screen performs continuous image refresh from cache, then the display smoothness is maintained, but the power consumption increases
Solution Approach 1:
Instead of continuous periodic refresh, the system implements conditional periodic refresh. The display screen refreshes only at specific intervals when new image data is available from the display driver, skipping refresh cycles when the cache contains no new images, thereby reducing unnecessary energy consumption while maintaining perceived smoothness
3Use of energy by moving object
If the refresh rate is reduced to save power, then the power consumption is reduced, but screen flicker may occur
Solution Approach 1:
The system uses feedback from the display driver about new image availability to control the refresh rate. When new images are detected, the refresh rate is increased to prevent flicker; when no new images are present, the refresh rate is reduced to save power. This feedback mechanism ensures flicker only occurs temporarily during transitions, not during sustained low-refresh periods
Data Source
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AI summary
This application provides an interface display method and a related apparatus. The method includes: when receiving an Nth frame of image transmitted by a display driver, a display screen refreshes and displays the Nth frame of image, where a corresponding frame rate during drawing and rendering of the Nth frame of image is a first frame rate; in a case that the display screen does not receive, within first duration in which the Nth frame of image is refreshed and displayed, an (N+1)th frame of image transmitted by the display driver, the display screen skips reading the Nth frame of image from a cache and keeps displaying the Nth frame of image, where the first duration is longer than periodicity duration corresponding to the first frame rate; and after the first duration after the display screen refreshes and displays the Nth frame of image, the display screen refreshes and displays the (N+1)th frame of image when the display screen receives the (N+1)th frame of image transmitted by the display driver, where a corresponding frame rate during drawing and rendering of the (N+1)th frame of image is a second frame rate, and the second frame rate is less than the first frame rate. A refresh rate is adaptively adjusted, an image refresh frequency is reduced, and power consumption is reduced.