Screen-Off Display via Reference Time and DDIC
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Solution Overview
Problem
Intelligent terminals face high power consumption when displaying time and notification messages while the screen is off, as they need to constantly awaken the Application Processor (AP) to acquire and plot the current time and format, leading to increased energy usage.
Innovation Solution
The method involves acquiring a content element and format information for screen-off display, using a stored reference time acquired by the AP at screen turn-off, and displaying this information using the Display Driver Integrated Circuit (DDIC or TDDI) without constantly awakening the AP, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Application Processor (AP) is constantly awakened to acquire and plot current time for screen-off display, then the display accuracy and real-time information availability are improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by acquiring and storing the reference time when the screen is turned off, before the display operation occurs. This pre-acquired reference time is then used by the Display Driver Integrated Circuit (DDIC) to calculate and display current time without needing to wake up the Application Processor (AP), thereby maintaining time display accuracy while avoiding the high power consumption associated with continuous AP awakening.
2Loss of information
If the Application Processor (AP) is constantly awakened to update and plot display content, then the information freshness and display relevance are improved, but the system complexity and energy usage increase
Solution Approach 1:
The patent introduces an intermediary mechanism where the Display Driver Integrated Circuit (DDIC) acts as a mediator between the stored reference time and the screen-off display. The DDIC calculates current time and formats display content based on the pre-stored reference time, eliminating the need for the Application Processor (AP) to be constantly awakened. This intermediary approach maintains information freshness while reducing system complexity and energy usage.
3Ease of operation
If the screen remains partially on to display time and notifications, then the user accessibility and information availability are improved, but the power consumption increases
Solution Approach 1:
The patent applies preliminary action by storing the reference time at screen turn-off, enabling the DDIC to perform all time calculation and display formatting operations independently without waking the AP. This allows the screen to remain partially on for user accessibility while maintaining low power consumption, as the energy-intensive AP remains dormant and only the low-power DDIC is active.
Data Source
AI summary
A method and device for screen-off display in the field of information processing are disclosed. A content element for screen-off display and format information corresponding to information content to be displayed via screen-off display are acquired. A reference time is acquired. The reference time refers to a system time acquired by an Application Processor (AP) at turnoff of a screen. The information content is displayed via screen-off display according to the reference time, the format information, and the content element for screen-off display. With embodiments herein, after the screen goes off, display is done straightforwardly according to the reference time, the format information, and the required content element, without the need to awaken the AP every minute to acquire an instant time, or to do plotting every minute according to the acquired instant time, thereby reducing power consumption.