Sensor Timing Control for Periodic Light Interference Removal
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Solution Overview
Problem
Image sensors in electronic devices for augmented reality, virtual reality, or mixed reality are susceptible to interference from external light sources such as Lidar systems or IR light sources, which degrade performance during 3D spatial recognition and head/hand tracking.
Innovation Solution
The electronic device includes a sensor module that identifies illuminance and detects the light emitting period of external light sources, allowing it to control its operation to avoid interference by predicting and adjusting the sensor module's operation based on the light emitting period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor module continuously measures illuminance to improve measurement accuracy, then measurement precision is improved, but interference from external periodic light sources increases
Solution Approach 1:
The sensor module operates in periodic intervals, switching between measurement mode and sleep mode. The measurement is performed only during specific time windows that avoid the periodic emission cycles of external light sources, thereby reducing interference while maintaining measurement accuracy.
Solution Approach 2:
The processor predicts the emission periods of external light sources based on historical data and schedules sensor measurements to occur before these predicted emission periods. This preliminary timing adjustment prevents the sensor from capturing interference signals while ensuring accurate illuminance measurement.
2Productivity
If the sensor module operates at high frequency to improve tracking performance, then productivity is improved, but susceptibility to external light interference increases
Solution Approach 1:
The sensor module uses periodic measurement intervals synchronized with the predicted emission periods of external light sources. By strategically timing measurements to occur during low-interference periods, the system maintains high tracking performance while minimizing exposure to harmful light interference.
Solution Approach 2:
The system dynamically adjusts the measurement frequency and timing of the sensor module based on real-time detection of external light source patterns. When external light interference is detected, the measurement schedule is adaptively modified to avoid interference periods, optimizing both tracking performance and interference resistance.
3Reliability
If the sensor module operates continuously to improve reliability, then reliability is improved, but energy consumption increases
Solution Approach 1:
The sensor module switches between active measurement periods and sleep periods, operating continuously over time but not at constant high power. This periodic operation maintains measurement reliability by ensuring measurements occur during critical periods while reducing overall energy consumption during low-priority intervals.
Solution Approach 2:
The processor predicts when measurements will be needed and pre-activates the sensor module only during these predicted periods. This preliminary scheduling ensures measurements are available when needed for reliability while avoiding continuous operation that would waste energy during periods when measurements are not required.
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 prevents interference from external light sources, improving the accuracy of illuminance measurement and head/hand tracking performance while ensuring clear image capture and adjusting display brightness or visor transmittance.
Implementation Method 1
Image sensors operate based on set frames and obtain an image by receiving external light
Data Source
AI summary
A method of reducing interference and an electronic device performing the method are provided. An electronic device may include: a sensor module including at least one sensor configured to identify illuminance of an external environment, a processor operatively connected to the sensor module, and a memory operatively connected to the processor and storing instructions executable by the processor. The processor may be configured to: identify the illuminance in a plurality of frames using the sensor module; determine, based on the illuminance, whether interference is present by an external light source that periodically emits light; identify, based on the illuminance, a light emitting period of the external light source; and control, based on the light emitting period, an operation of the sensor module such that the interference by the external light source does not occur.