Ambient Light Sensor Array with Variable Photosensitive Areas
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Solution Overview
Problem
Ambient light sensors integrated inside screens suffer from low detection accuracy due to fixed gain and inability to accurately detect low-brightness and high-brightness ambient light with a single sensor.
Innovation Solution
A method and device that integrate multiple ambient light sensors with varying photosensitive areas, where the size of the photosensitive areas are inversely proportional to the corresponding brightness intervals, allowing flexible selection based on environment and accuracy needs, using a preset conversion formula to output accurate brightness signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ambient light sensor is used, then the device complexity is reduced, but the measurement precision of ambient light detection deteriorates
Solution Approach 1:
The patent divides the ambient light detection function into multiple segments by using several ambient light sensors with different photosensitive areas instead of a single sensor. Each sensor is responsible for detecting light within its optimal brightness range, thereby improving overall detection accuracy across varying light conditions
Solution Approach 2:
The patent changes the parameter of photosensitive area among multiple sensors to create different gain characteristics. By having sensors with varying photosensitive areas, the system can adapt to different ambient light brightness levels, improving measurement precision without significantly increasing device complexity
2Measurement precision
If multiple ambient light sensors with different photosensitive areas are used, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic selection mechanism where the controller automatically chooses the appropriate sensor based on the current ambient light brightness. This dynamic adaptation allows the system to maintain high detection accuracy while managing complexity through intelligent control rather than hardware redundancy
Solution Approach 2:
Multiple ambient light sensors serve different functions by covering different brightness ranges. Each sensor is optimized for specific light conditions, making the system universally applicable across various ambient light environments while maintaining reasonable device complexity
3Device complexity
If fixed gain sensors are used, then the device complexity is reduced, but the adaptability to different brightness conditions deteriorates
Solution Approach 1:
The patent changes the gain parameter by using sensors with different photosensitive areas instead of using a single sensor with adjustable gain. This approach provides inherent adaptability to different brightness conditions while keeping the control mechanism simple, as each sensor naturally responds to its optimal brightness range
Solution Approach 2:
The patent performs preliminary action by pre-configuring sensors with different photosensitive areas to cover different brightness ranges before actual detection begins. This pre-arranged configuration enables the system to adapt to various light conditions without requiring complex real-time gain adjustment mechanisms
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
Improves detection accuracy by selecting appropriate sensors for ambient light brightness detection, effectively addressing the limitations of single-sensor systems in varying light conditions.
Implementation Method 1
The ambient light sensors integrated inside the screens have a problem of low detection accuracy
Data Source
AI summary
A method, device, and display device for detecting ambient light are provided. The method includes obtaining brightness information of the ambient light, determining a brightness interval of the ambient light according to the brightness information of the ambient light and preset correspondences between a plurality of ambient light sensors and different brightness intervals, using the ambient light sensor corresponding to the brightness interval of the ambient light as a reference sensor, and outputting a brightness signal of a current ambient light according to output signals of the ambient light sensors and a preset conversion formula.