Ambient Light Sensor Array for Gesture Detection and Flicker Filtering
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Solution Overview
Problem
Ambient light sensors in computation and communication devices face performance issues due to factors like AC ripple and smudges on glass screens, which affect their ability to accurately detect gestures and adjust backlighting.
Innovation Solution
The use of multiple ambient light sensors arranged in a triangular pattern beneath the screen, with adjustable sensitivity and wavelength ranges, allows for effective detection of gestures by measuring changes in light intensity and filtering out noise, such as AC flicker and smudges, through simultaneous or sequential sampling patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single ambient light sensor is used to detect gestures and adjust backlighting, then the device structure remains simple, but the sensor performance is affected by AC ripple and smudges on the screen
Solution Approach 1:
The patent divides the sensing function into multiple ambient light sensors positioned at different locations beneath the screen. Each sensor experiences different levels of interference from smudges and AC flicker, and by segmenting the sensing array, the system can identify and filter out corrupted readings while maintaining reliable gesture detection and backlight control.
2Measurement precision
If multiple ambient light sensors are arranged in a triangular pattern beneath the screen, then gesture detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent employs an asymmetric triangular arrangement of ambient light sensors beneath the screen, where sensors are positioned at non-uniform intervals and orientations. This asymmetric configuration optimizes the detection of gesture-induced light blockage patterns while maintaining a compact form factor, achieving high measurement precision without excessive complexity.
Solution Approach 2:
The patent transitions from a single-point light sensing approach to a distributed array of sensors positioned at multiple spatial coordinates beneath the screen. This dimensional expansion creates a spatial mapping capability that enables precise gesture detection by analyzing light blockage patterns across the sensor array, effectively adding spatial dimensions to the measurement process.
3Adaptability or versatility
If ambient light sensors operate under AC-powered light sources, then the device can function in various lighting conditions, but AC flicker interferes with sensor readings
Solution Approach 1:
The patent leverages the periodic nature of AC-powered light flicker by implementing synchronized sampling of ambient light sensor readings at specific phases of the AC cycle. By timing the measurements to occur during periods when flicker interference is minimal or by sampling multiple times per cycle and averaging the results, the system maintains measurement precision while operating under AC-powered lighting conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors ambient light readings from multiple sensors and dynamically adjusts for AC flicker interference. By comparing readings across sensors and identifying patterns consistent with AC-powered lighting, the system can compensate for flicker effects and maintain accurate light intensity measurements for gesture detection and backlight control.
4Strength
If ambient light sensors are placed beneath the glass screen for protection, then the sensors are protected from damage, but smudges on the screen affect sensor performance
Solution Approach 1:
The patent positions multiple ambient light sensors at different locations beneath the glass screen, creating a segmented sensing array. This segmentation ensures that smudges on the screen surface, which typically affect only localized areas, do not completely block light from all sensors. The system can identify and compensate for smudge-induced interference by comparing readings across the distributed sensor array.
Solution Approach 2:
The patent implements local quality differentiation by positioning sensors at specific locations beneath the screen where they experience different levels of interference from potential smudges. By strategically placing sensors in areas less susceptible to fingerprint contamination while maintaining protective coverage, the system optimizes the balance between physical protection and sensing reliability.
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 solution enables reliable touch-less gesture detection and dynamic backlight adjustment, improving the accuracy and robustness of ambient light sensor performance in various environmental conditions.
Implementation Method 1
identifying a gesture based on the light intensity measurements
Implementation Method 2
An ambient light sensor may be used to adjust the backlighting of the display
Data Source
AI summary
A device and method to control measurements of light intensity are described. The device includes two or more ambient light sensors arranged at respective surface locations of the device, each of the two or more ambient light sensors measuring the light intensity at the respective surface location. The device also includes a processor to control operation of the two or more ambient light sensors.