Ambient Light Sensor Correction for Optical Filter Distortion
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Solution Overview
Problem
Existing mobile devices face challenges in accurately sensing and adjusting to ambient light conditions due to the filtering effects of optical elements, which can distort electromagnetic radiation and affect display brightness, camera settings, and flash output.
Innovation Solution
A method and device that utilize multiple photosensing elements to sense electromagnetic radiation, with a processor adjusting the sensed information based on the transmission spectrum of the optical element, applying weighting factors to compensate for filtering and distortion, and determining illuminance or image data to optimize display and camera settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical element (such as a display cover or window) is used in the mobile device, then the device structure is improved and protection is provided, but the optical element filters and distorts electromagnetic radiation, causing inaccurate ambient light sensing
Solution Approach 1:
The system changes the parameters of the sensed electromagnetic radiation by applying correction factors that compensate for the optical element's transmission spectrum. The processor adjusts the sensed values based on predetermined correction data, transforming the filtered measurements into accurate ambient light readings despite the optical element's filtering effects.
2Device complexity
If a photosensor is positioned behind an optical element to sense ambient light, then the device design is simplified, but the sensed electromagnetic radiation information is distorted due to the optical element's transmission spectrum
Solution Approach 1:
The system introduces an intermediary correction process between the photosensor and the ambient light determination. The processor acts as a mediator that receives distorted sensed values and transforms them into accurate ambient light measurements by applying correction factors derived from the optical element's transmission spectrum characteristics.
3Productivity
If the photosensor senses electromagnetic radiation directly without correction, then the processing is simpler, but the display brightness and camera settings are incorrectly adjusted
Solution Approach 1:
The system performs preliminary action by pre-determining the correction factors based on the optical element's transmission spectrum before actual ambient light sensing occurs. This allows the processor to quickly apply pre-calculated correction factors during operation, maintaining processing efficiency while ensuring measurement accuracy.
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 enables accurate adjustment of display brightness, white balance, and camera settings, improving visual comfort and battery efficiency while accounting for the optical element's filtering effects, thereby enhancing the device's responsiveness to ambient light conditions.
Implementation Method 1
sensing electromagnetic radiation transmitted by the optical element to produce sensed electromagnetic radiation information
Data Source
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AI summary
A method (800) of adjusting electromagnetic radiation transmitted by an optical element (250) is described. The method includes sensing (830) the electromagnetic radiation transmitted by the optical element to produce sensed electromagnetic radiation information (615), and adjusting (835) the sensed electromagnetic radiation information to produce adjusted electromagnetic radiation information (620) based on the a spectral transmission of the optical element.