Screen Casting Backlight Control for Power Saving
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Solution Overview
Problem
Electronic devices experience high power consumption during screen casting, leading to faster battery depletion, as the screen of the display source remains active even when not in use, affecting user experience and requiring continuous power supply.
Innovation Solution
Implementing dynamic backlight control modes (Active, Power-saving, and Sleep) to manage screen casting signals and backlight settings based on user activity, reducing power consumption and ensuring security by setting the backlight to 0% in Power-saving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screen of the display source remains active during screen casting, then the screen casting function is maintained, but power consumption increases and battery depletes faster
Solution Approach 1:
The patent implements dynamic backlight control that adjusts the display source screen between active and off states based on real-time detection of user activity on the casted screen. When user activity is detected, the backlight remains active; when no activity is detected for a threshold period, the backlight turns off. This dynamic adaptation resolves the contradiction by making the system flexible rather than static, maintaining functionality when needed while saving energy when not needed.
Solution Approach 2:
The system employs feedback mechanisms where the display sink monitors user activity on the casted screen and communicates this information back to the display source. Based on this feedback, the display source automatically adjusts its backlight state. This closed-loop feedback system ensures the screen casting function is maintained during active use while reducing power consumption during idle periods.
2Use of energy by moving object
If the screen of the display source is turned off to save power, then power consumption is reduced, but the screen casting function is interrupted
Solution Approach 1:
The system dynamically switches between power-saving state (backlight off) and functional state (backlight on) based on real-time user activity detection. The backlight turns off when no user activity is detected for a threshold period, and turns back on when user activity is detected again. This dynamic behavior ensures power consumption is minimized while the screen casting function remains reliably available when users actually need it.
Solution Approach 2:
The system implements periodic monitoring of user activity on the casted screen at defined intervals. This periodic checking allows the system to determine when to transition between active and power-saving states, ensuring that the screen casting function is restored promptly when users resume interaction, thus maintaining reliability while achieving power savings during idle periods.
3Use of energy by moving object
If the backlight is set to 0% in Power-saving mode, then power consumption is significantly reduced, but visibility of the screen is lost
Solution Approach 1:
The system dynamically adjusts backlight intensity between two states: 0% (off) in power-saving mode and user-defined intensity in active mode. The transition between these states is triggered by user activity detection on the casted screen. This dynamic switching resolves the contradiction by ensuring the screen is completely dark when not in use (maximizing power savings) but fully visible when users need to interact with it.
Solution Approach 2:
The system changes the backlight intensity parameter based on operational state. In power-saving mode, the backlight intensity is set to 0%, and in active mode, it is restored to user-defined settings. This parameter change approach allows the system to achieve extreme power savings during idle periods while maintaining full visibility functionality when needed, effectively resolving the visibility-power consumption trade-off.
4Reliability
If the screen casting signal is continuously streamed, then the screen casting function is maintained, but power consumption increases
Solution Approach 1:
The system implements dynamic control of signal streaming based on user activity detection. When user activity is detected on the casted screen, the signal stream is actively transmitted. When no user activity is detected for a threshold period, the signal streaming is paused or stopped. This dynamic approach ensures the screen casting function remains reliable during active use while significantly reducing power consumption during idle periods.
Solution Approach 2:
The system employs periodic monitoring of user activity to determine when to pause or resume signal streaming. This periodic action allows the system to maintain screen casting functionality during active use while reducing power consumption by pausing the signal stream during extended idle periods, effectively resolving the contradiction between continuous functionality and power savings.
Data Source
AI summary
Screen casting on between two devices is described. In an example implementation, a communication link is established by a first device with a second device for casting a screen of the second device on the first device. Upon establishing the communication link, a command message is sent by the first device to the second device to set a backlight of the screen of the second device based on user backlight settings. When no user activity is detected on the second device for a specific time period, a request message is received by the first device from the second device, indicating switching the backlight of the screen of the second device to power-saving backlight settings. In response to the request message, a command message is sent by the first device to the second device to set the backlight of the screen of the second device based on the power-saving backlight settings.