Proximity Sensing Cross Talk Compensation Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical proximity sensing devices in electronic devices, such as smartphones, face issues with cross talk interference that affect sensitivity and precision, leading to erroneous activations when the device is held near the user's ear during calls.
Innovation Solution
A proximity sensing method that initializes and updates a cross talk value based on sensing values received from the sensing unit, allowing for the calculation of a compensated sensing value by subtracting the cross talk value, thereby enhancing sensitivity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical proximity sensing is used in smartphones, then the device can detect objects near the ear during calls, but cross talk interference causes erroneous touch activations and reduces sensing precision
Solution Approach 1:
The patent converts the harmful cross talk signal into a useful calibration reference. By intentionally measuring the cross talk value through specific sensing operations and using it to compensate subsequent measurements, the system transforms the interference from a detrimental factor into a corrective reference that improves overall sensing accuracy.
Solution Approach 2:
The patent dynamically adjusts the sensing threshold parameter based on measured cross talk conditions. By changing the threshold according to actual cross talk levels rather than using a fixed value, the system adapts to varying interference conditions and maintains reliable detection performance across different operating scenarios.
2Measurement precision
If the sensing threshold is fixed, then the device structure is simple, but the sensing precision and dynamic range are limited under varying cross talk conditions
Solution Approach 1:
The system performs self-calibration by automatically measuring its own cross talk characteristics and using this information to adjust its sensing parameters. The proximity sensing device serves its own calibration needs without requiring external calibration equipment or complex manual adjustment mechanisms, thereby improving precision while maintaining relatively simple device structure.
Solution Approach 2:
The patent implements a feedback mechanism where the measured cross talk value is fed back into the sensing system to dynamically adjust the detection threshold. This closed-loop approach allows the system to automatically compensate for interference variations, improving measurement precision through parameter adjustment based on real-time feedback about the operating conditions.
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 method improves the sensing sensitivity and precision of proximity sensing devices, increasing the dynamic range of the compensated sensing value and preventing erroneous activations.
Implementation Method 1
The light emitting unit is used to emitting a first light to an object to be tested. The sensing unit is used to sense a second light entering the sensing unit.
Data Source
AI summary
An exemplary embodiment of the present disclosure illustrates a proximity sensing method used in a controller of a proximity sensing device. Firstly, a cross talk value is initialized. After the cross talk value is initialized, whether the cross talk value should be updated is judged at least according to a first sensing value currently received from a sensing unit of the proximity sensing device. When the cross talk value is judged to be updated, the cross talk value is updated at least according to a first sensing value. Then, a compensated sensing value is obtained by subtracting the cross talk value from the first sensing value.