Display Power Management via Face Detection Dynamics
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Solution Overview
Problem
Mobile devices face challenges in power management, particularly in determining user activity to efficiently switch between display modes and conserve power without compromising user experience.
Innovation Solution
An electronic device with a processor, display interface, and image capturing apparatus that captures images, detects face areas, and compares their relative status to control the display mode, switching between display, dim, and sleep modes based on user presence and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the display interface is kept on to ensure user experience, then user experience is improved, but power consumption increases
Solution Approach 1:
The display interface dynamically adjusts its state between wake and sleep modes based on real-time detection of user presence. The system transitions from a static display state to a dynamic one where the display mode changes according to whether a user is detected in the captured image, resolving the contradiction between maintaining user experience and reducing power consumption.
Solution Approach 2:
The system uses an image capturing apparatus to continuously monitor the environment and provide feedback about user presence. This feedback loop allows the processor to determine whether the display should remain active or enter sleep mode, enabling intelligent power management that balances user experience with energy conservation.
2Use of energy by moving object
If the display interface is switched to sleep mode to save power, then power consumption is reduced, but user experience deteriorates
Solution Approach 1:
The display interface transitions between sleep and wake states based on dynamic detection of user presence. When no user is detected, the system enters sleep mode to conserve power; when a user is detected, the system wakes up to provide service, thus dynamically resolving the contradiction between power saving and user experience.
Solution Approach 2:
The image capturing apparatus provides continuous feedback about the environment and user presence. This feedback enables the processor to make informed decisions about display state, ensuring the display only activates when needed, thereby minimizing power consumption while maintaining user experience when users are present.
3Measurement precision
If face detection is implemented to determine user presence, then power management accuracy is improved, but device complexity increases
Solution Approach 1:
The image capturing apparatus serves multiple functions: it captures images for display purposes and simultaneously detects user presence for power management. This multi-functionality allows the system to implement accurate face detection without adding dedicated detection hardware, thus improving measurement precision while minimizing the increase in device complexity.
Solution Approach 2:
The processor performs both image processing for display and face detection for power management using the same computational resources. By utilizing existing processing capabilities for dual purposes, the system achieves accurate user presence detection without requiring separate dedicated hardware, thereby limiting the increase in device complexity.
Data Source
AI summary
The disclosure discloses an electronic device. The electronic device includes a display interface, an image capturing apparatus, a memory, and a processor. The memory stores a program command. The processor is configured to execute the stored program command to perform the following steps: controlling the image capturing apparatus to capture an image; detecting a face area in the image, wherein a relative status between the face area and the image exists; comparing the relative status with a preset status; and when the relative status meets the preset status, controlling the display interface to be in a first mode.