Screen Proximity Control via Threshold Signal Analysis
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Solution Overview
Problem
Mobile phone screens abnormally brighten or darken due to foreign matter and oil on the screen, affecting user experience during calls, as existing technologies fail to accurately detect and adjust for such obstructions.
Innovation Solution
An electronic device equipped with a distance sensor, processor, and memory that adjusts screen operation modes based on signal strength values, using threshold values and a predetermined value to differentiate between normal usage and foreign matter interference, thereby maintaining correct display behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the screen darkens to save power during phone calls, then power consumption is reduced, but foreign matter and oil on the screen cause abnormal brightening and darkening
Solution Approach 1:
The system performs preliminary detection of the cheek area using a distance sensor before the screen darkening action is executed. By detecting the signal strength value in advance and comparing it with threshold values, the system identifies foreign matter or oil on the screen before abnormal display behavior occurs, allowing preventive measures to be taken
Solution Approach 2:
The system implements a feedback mechanism where the distance sensor continuously monitors the cheek area and provides signal strength information to the processor. The processor compares this feedback with stored threshold values and adjusts screen operation accordingly, creating a closed-loop control system that maintains display stability while enabling power saving
2Extent of automation
If the distance sensor detects signal strength to determine cheek proximity, then power-saving mode can be activated, but foreign matter on the screen causes false detection and abnormal screen behavior
Solution Approach 1:
The system uses parameter changes by comparing signal strength values against multiple threshold values (first threshold and second threshold) stored in memory. By adjusting and comparing against different threshold parameters, the system can distinguish between normal cheek proximity (higher signal strength) and foreign matter interference (lower signal strength), improving detection accuracy
Solution Approach 2:
The system applies local quality by focusing the detection on specific signal strength characteristics of the cheek area. The distance sensor is positioned to detect reflections from the cheek area specifically, and the processor analyzes the local signal strength properties to determine whether the detected object is a cheek or foreign matter, rather than relying on general proximity detection
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 effectively prevents foreign matter or oil stains from interfering with screen functionality, ensuring accurate power-saving and normal operation modes, thus enhancing user experience by accurately detecting and adjusting for screen obstructions.
Implementation Method 1
The distance sensor is configured to transmit an acknowledgement signal, and detect a signal strength value of a feedback signal responding to the acknowledgement signal
Data Source
AI summary
A controlling method for an electronic device is provided, including the following steps: receiving a feedback signal; determining a signal strength value of the feedback signal; obtaining a first threshold value and a second threshold value; comparing the signal strength value with the first threshold value and the second threshold value, where the first threshold value is less than the second threshold value; controlling a screen to operate in a first mode when the signal strength value is greater than the second threshold value; comparing the signal strength value with a predetermined value when the signal strength value is greater than the first threshold value but not greater than the second threshold value, and adjusting the first threshold value to be the signal strength value when the signal strength value is greater than the predetermined value.