Proximity Sensor Control for Infrared Interference Elimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In smartphones, the proximity sensor fails to accurately control the screen on or off in bright light environments due to infrared interference from ambient light sources, leading to energy wastage and screen malfunction.
Innovation Solution
A method involving a proximity sensor control scheme that outputs driving signals with a preset timing and duty cycle to periodically switch the sensor between sleep, off, and on modes, using an analog-digital converter to store and clear input signals, thereby determining approaching or leaving states and eliminating infrared interference from ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the proximity sensor continuously monitors infrared intensity to accurately detect face proximity, then the detection accuracy is improved, but the energy consumption increases and the sensor is susceptible to infrared interference from ambient light
Solution Approach 1:
The proximity sensor operates in periodic cycles, alternating between sleep mode and measurement mode. During each cycle, the sensor remains in sleep mode to conserve energy, then periodically wakes up to perform measurements. This periodic operation reduces overall energy consumption while maintaining detection capability, resolving the contradiction between continuous monitoring and energy saving.
Solution Approach 2:
Before performing proximity detection, the system pre-charges capacitors and prepares the analog-to-digital converter. This preliminary action allows the sensor to quickly transition from sleep mode to measurement mode, reducing the time spent in high-power states and thereby reducing overall energy consumption while maintaining detection accuracy.
2Reliability
If the proximity sensor operates continuously to ensure accurate screen control, then the reliability of screen control is improved, but the infrared interference from ambient light increases the measurement error
Solution Approach 1:
The system performs preliminary measurements of ambient infrared light intensity before proximity detection, then subtracts this background interference from the total measured intensity. This preliminary anti-action compensates for the harmful infrared interference from ambient light sources like fluorescent lamps, thereby maintaining measurement accuracy and screen control reliability even in bright light environments.
Solution Approach 2:
The system continuously monitors ambient light conditions and dynamically adjusts the proximity detection algorithm based on the measured infrared background. When high ambient infrared intensity is detected, the system compensates by subtracting the background level and adjusting threshold values, ensuring reliable screen control despite varying environmental conditions.
3Device complexity
If the proximity sensor uses a simple continuous monitoring mode, then the device complexity is reduced, but the ability to eliminate infrared interference from ambient light is compromised
Solution Approach 1:
The proximity detection function is segmented into distinct operational modes: sleep mode for energy saving, measurement mode for data acquisition, and compensation mode for interference elimination. The sensor control is divided into separate capacitive charging phases and measurement phases. This segmentation allows each phase to be optimized independently, enabling effective interference elimination without requiring a complete redesign of the sensor system.
Solution Approach 2:
The system performs preliminary charging of capacitors and preliminary measurement of ambient infrared levels before the actual proximity detection. These preliminary actions are built into the sensor operation sequence, allowing the system to automatically compensate for ambient light interference without requiring complex real-time processing during the critical measurement phase.
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
This approach ensures accurate screen control, preventing energy wastage and screen malfunctions in bright light conditions by deducting infrared interference, thus achieving normal screen operation.
Implementation Method 1
Proximity sensor (PS) including a infrared emitting light-emitting diode
Implementation Method 2
when used to call by infrared emission launch, and through the proximity sensor receiving end receives the face of the reflection of the infrared intensity values
Implementation Method 3
controlling the receiving end to be in a sleep mode and a sampling mode periodically; controlling an analog-digital converter in the receiving end to store a first input signal
Data Source
AI summary
The present disclosure provides a method for controlling a proximity sensor, a device, a storage medium and a mobile terminal. The method comprising outputting a driving signal, to a transmitting end and a receiving end of a proximity sensor, controlling the transmitting end to be in a sleep mode, an off mode, and an on mode periodically, controlling the receiving end to be in a sleep mode and a sampling mode periodically; controlling an analog-digital converter to store a first input signal, in a sampling period of the receiving end corresponding to the off mode, and controlling the analog-digital converter to clear the first input signal from a received second input signal, outputting a first intensity value corresponding to the second input signal after the clearing process, in a sampling period of the receiving end when it is in the on mode.