Display Backlight Control via Motion Sensor Threshold
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Solution Overview
Problem
Conventional portable display apparatuses, such as mobile phones, automatically turn off the backlight when no user operation is detected, leading to an interruption in viewing even if the user is still using the device, which is not user-friendly and results in reduced operational time due to unnecessary power consumption.
Innovation Solution
A display apparatus equipped with a motion sensor to detect parameters like vibration frequency and acceleration, a signal processor to compare these parameters with a threshold, and a controller to manage the backlight's power state, ensuring it remains on as long as the user is actively viewing, thereby reducing power consumption and extending operational time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight is automatically turned off when no user operation is detected, then power consumption is reduced, but user viewing is interrupted even if the user is still using the device
Solution Approach 1:
The patent replaces the conventional touch-based detection system with an acoustic wave-based detection system. The acoustic sensor detects sound waves generated by user interactions (such as shuffling cards or tapping the table), enabling the system to distinguish between genuine user inactivity and active viewing scenarios. This substitution allows the backlight to remain on during active viewing while still turning off during true inactivity, resolving the contradiction between power consumption and viewing continuity.
Solution Approach 2:
The patent introduces an intermediary acoustic detection mechanism that acts as a mediator between user behavior and backlight control. The acoustic sensor serves as an intermediary that captures subtle environmental cues (sound waves from card shuffling, table taps) to infer user presence and activity state, enabling more nuanced control decisions than direct touch detection alone could provide.
2Ease of operation
If the backlight remains on during user viewing, then viewing continuity is maintained, but power consumption increases and operational time decreases
Solution Approach 1:
The patent implements a feedback mechanism where the acoustic sensor continuously monitors the environment and provides real-time information about user activity. The control system processes this acoustic feedback to dynamically adjust backlight state, turning it off only when genuine inactivity is detected. This feedback loop enables the system to maintain viewing continuity during active use while conserving power during actual inactivity, optimizing both viewing experience and operational time.
Solution Approach 2:
The patent introduces dynamic control of the backlight based on real-time acoustic analysis. Rather than using a static timeout mechanism, the system continuously adapts its behavior based on detected acoustic patterns, allowing the backlight state to dynamically respond to user activity levels and environmental cues, thereby optimizing power consumption while maintaining viewing continuity.
3Device complexity
If conventional touch-based detection is used, then the system is simple, but it cannot distinguish between user inactivity and active viewing without touch input
Solution Approach 1:
The patent makes the acoustic sensor serve multiple functions: it detects user presence, determines activity state, and infers viewing intent. By using a single acoustic detection mechanism for multiple purposes, the system achieves high detection accuracy without proportionally increasing complexity. The acoustic sensor replaces or supplements touch sensors, providing richer information about user behavior while adding minimal hardware complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows users to continue viewing without interruptions by maintaining the backlight on based on user activity, reducing power consumption and increasing the operational time of the display apparatus.
Implementation Method 1
a motion sensor for detecting a motion parameter of the display apparatus and generating a motion parameter signal representing the motion parameter; the motion parameter comprises a vibration frequency and an acceleration
Data Source
AI summary
The present application discloses a display apparatus including a display panel; a backlight module; a motion sensor for detecting a motion parameter of the display apparatus and generating a motion parameter signal representing the motion parameter; at least one signal processor for comparing the motion parameter with a threshold value, and generating a power off signal if the motion parameter is greater than the threshold value; and a controller for controlling a state of the backlight module; the controller is configured to control the backlight module in a power off state upon receiving the power off signal.