Adaptive Refresh Rate Control for Wearable Display Power Reduction
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Solution Overview
Problem
Wearable devices such as smart watches and smart bracelets face challenges in reducing power consumption due to their small size, which limits battery capacity, especially during display operations.
Innovation Solution
A display device and method that utilize a plurality of sub-pixels arranged in an array with multiplexers, including m switch units, where m1 first switch units and m2 second switch units are controlled to minimize power consumption by reducing voltage jumps and maintaining display phases, allowing for efficient data writing and display maintenance with reduced refresh frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device uses conventional driving methods with frequent refresh operations, then the display quality is maintained, but the power consumption increases
Solution Approach 1:
The patent implements a dual-mode refresh mechanism where the display operates at a high refresh rate (first refresh rate) when content changes are detected, and switches to a low refresh rate (second refresh rate) when content remains static. This periodic adjustment of refresh rates based on content change detection reduces unnecessary power consumption while maintaining display quality when needed.
Solution Approach 2:
The patent employs a content change detection mechanism that monitors the display content and provides feedback to the control circuit. When changes are detected, the system adjusts the refresh rate accordingly. This feedback loop ensures that the display maintains high quality when content changes while reducing power consumption during static display periods.
2Use of energy by moving object
If the display device reduces refresh frequency to save power, then power consumption decreases, but display quality may deteriorate
Solution Approach 1:
The patent dynamically adjusts the refresh rate based on real-time content change detection. The system transitions between high and low refresh rates depending on whether content changes are detected, making the refresh rate adaptive rather than fixed. This dynamic adjustment maintains display quality during content changes while reducing power consumption during static periods.
Solution Approach 2:
The patent implements periodic content change detection at different refresh rates. The control circuit periodically checks for content changes using the first refresh rate initially, then switches to the second refresh rate for subsequent checks. This periodic detection mechanism ensures display quality is maintained when needed while reducing power consumption during static display periods.
3Reliability
If the display device maintains high refresh rate continuously, then display quality is ensured, but battery life decreases
Solution Approach 1:
The patent implements a dual-mode refresh strategy where the display operates at a high refresh rate initially, then periodically checks for content changes at a lower refresh rate. This periodic operation pattern reduces the average power consumption while maintaining display quality when content changes occur, thereby extending battery life.
Solution Approach 2:
The patent changes the refresh rate parameter based on content change detection. The system starts with a first refresh rate to ensure display quality, then switches to a second, lower refresh rate when content remains static. This parameter adjustment reduces power consumption and extends battery life while maintaining display quality when needed.
4Use of energy by moving object
If the display device uses multiple switch units with complex control, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent divides the multiplexer into multiple switch units (first switch unit and second switch unit) that can be independently controlled. The first switch unit handles content change detection at the first refresh rate, while the second switch unit handles detection at the second refresh rate. This segmentation allows selective activation of switch units based on content changes, reducing power consumption while managing complexity through modular control.
Solution Approach 2:
The patent dynamically controls the activation state of different switch units based on content change detection results. When content changes are detected, the first switch unit is activated; when no changes are detected, the second switch unit is activated. This dynamic control optimizes power consumption while managing device complexity through conditional activation of different control paths.
Data Source
AI summary
Display devices and methods for driving display devices are provided. The method may include, in a first stage of the data writing phase, always turning on m1 first switch units of each multiplexer under a control of m1 corresponding clock signal lines, and sequentially turning on m2 second switch units for a preset time in a preset order; in a second stage of the data writing phase, keeping the m1 first switch units always on, turning off the m2 second switch units, and writing corresponding data voltage signals to the row of sub-pixels to cause the row of sub-pixels to display; and in the display maintaining phase, displaying same as in the second stage of the data writing phase. At least one first switch unit is always turned on under the control of a corresponding clock signal line when at least two continuously scanned rows of sub-pixels are displaying.