Dynamic Detection Interval for Display Power Control
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Solution Overview
Problem
Existing techniques for detecting user presence to save power in display devices require constant camera operation, leading to increased power consumption and potential user usability issues.
Innovation Solution
An electronic apparatus with a presence determining module, display power controller, and detection interval controller that adjusts the face detection interval to be shorter when the display is off and longer when the user is present, optimizing power saving modes and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the camera operates constantly to detect user presence for rapid power saving mode switching, then the response speed to user absence is improved, but the camera power consumption increases
Solution Approach 1:
The camera operates periodically at adjustable intervals rather than continuously. The control unit adjusts the detection interval dynamically: using shorter intervals when the display is off to quickly detect user return, and longer intervals when the display is on to reduce power consumption. This periodic operation with variable timing resolves the contradiction between rapid response and energy saving.
Solution Approach 2:
The system dynamically adjusts the camera operation mode based on display state. When the display transitions to off state, the camera switches to a high-frequency detection mode for rapid user presence/absence detection. When the display is on, the camera operates at lower frequency. This dynamic adaptation allows the system to optimize both response speed and power consumption according to operational context.
2Ease of operation
If the detection interval is shortened to ensure rapid display activation upon user return, then the usability is improved, but the camera power consumption increases
Solution Approach 1:
The system implements periodic camera activation with variable intervals optimized for different operational states. During display-off periods, shorter detection intervals ensure rapid usability restoration when users return, while maintaining acceptable power consumption through the periodic rather than continuous operation framework.
Solution Approach 2:
The system prepares for rapid usability restoration by maintaining a ready-state detection mechanism during display-off periods. The camera is pre-configured to activate at scheduled intervals, ensuring that user return can be detected immediately without requiring continuous monitoring, thus balancing preliminary preparation with energy efficiency.
3Use of energy by moving object
If the camera operates at long intervals to save power, then the camera power consumption is reduced, but the display activation delay increases
Solution Approach 1:
The detection interval is dynamically adjusted based on display state rather than using a fixed long interval. When the display is off, the system switches to shorter detection intervals to minimize activation delay. When the display is on, longer intervals are used to save power. This dynamic adjustment resolves the contradiction between power saving and time loss.
Solution Approach 2:
Instead of using consistently long intervals, the system employs variable periodic detection: shorter intervals during display-off states to reduce activation delay, and longer intervals during display-on states to maximize power savings. This context-dependent periodic operation balances both competing requirements.
Data Source
AI summary
According to one embodiment, an electronic apparatus includes: a presence determining module configured to determine at an interval whether a user is present based on image data output by a camera; a display power controller configured to turn on a display when the user is present and to turn off the display when the user is not present, based on a result of the presence determining module; and a detection interval controller configured to control the interval such that the interval is shorter when the display is off compared to when the display is on and the user is determined to be present.