Foldable Device Photosensor Illuminance Correction
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Solution Overview
Problem
Electronic devices struggle to accurately measure illuminance due to the limited size of photosensors, leading to inappropriate display brightness adjustments, which can cause user fatigue, especially in foldable devices where different areas face different directions.
Innovation Solution
A foldable electronic device with a photosensor and processor that corrects illuminance values based on the incident angle of light, allowing for precise brightness adjustments across all areas, including those facing different directions when the device is folded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photosensor with limited size is used to measure illuminance, then the device structure remains compact, but the illuminance measurement becomes inaccurate when side light is emitted
Solution Approach 1:
The photosensor is divided into multiple light receivers (first light receiver and second light receiver) positioned at different locations. Each light receiver measures light intensity from different directions, and the processor segments the illuminance measurement by selecting or combining data from different light receivers based on the incident angle of light, thereby improving measurement accuracy without increasing overall device complexity
Solution Approach 2:
The processor acts as an intermediary that receives raw light intensity data from multiple light receivers, calculates the incident angle of light, determines which light receiver data is reliable, and corrects the illuminance value accordingly. This intermediary processing layer enables accurate illuminance measurement by mediating between the limited photosensor structure and the required measurement precision
2Ease of operation
If display brightness is automatically adjusted based on uncorrected illuminance values, then the adjustment process is simple and fast, but the brightness may be inappropriate causing user eye fatigue
Solution Approach 1:
The system implements feedback by continuously monitoring light intensity through the photosensor, calculating the incident angle, correcting the illuminance value based on the incident angle, and then adjusting the display brightness accordingly. This closed-loop feedback mechanism ensures that brightness adjustment remains both simple (automatic) and reliable (accurate), preventing user eye fatigue
Solution Approach 2:
The system changes the parameter used for brightness control from raw illuminance value to corrected illuminance value that accounts for incident angle. By modifying this key parameter, the system maintains the simplicity of automatic brightness adjustment while improving its reliability to match user viewing conditions
3Device complexity
If a single illuminance value is used for the entire display in a foldable device, then the control process is simple, but different areas facing different directions cannot be appropriately adjusted
Solution Approach 1:
The display is segmented into multiple areas (first display area and second display area) that face different directions. The photosensor is divided into multiple light receivers corresponding to different display areas. The processor segments the brightness control by determining appropriate brightness values for each display area based on light intensity measurements from corresponding light receivers and their respective incident angles, enabling independent optimization of each area without excessive complexity
Solution Approach 2:
Different display areas are assigned different brightness characteristics based on their local viewing conditions. The first display area and second display area can have different brightness values optimized for their respective orientations and usage scenarios. This local quality approach allows each area to adapt to its specific environment while maintaining overall system simplicity
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 solution enables accurate illuminance measurement and appropriate display brightness adjustments, reducing user fatigue by considering the incident angle of light and folding angle of the device.
Implementation Method 1
a photosensor disposed inside the housing and including a light receiver configured to measure an intensity of light shining on the electronic device
Data Source
AI summary
A foldable electronic device is provided. The foldable electronic device includes a foldable housing that can be fold/unfolded with respect to a folding shaft, a display that is visible through one surface of the foldable housing, a photosensor which is arranged inside the foldable housing and which includes a light-receiving unit for measuring the intensity of light emitted at the electronic device, and at least one processor operationally connected to the photosensor and the display, wherein the at least one processor is configured to acquire an illuminance value by using the photosensor, acquire data related to the incident angle of the light, emitted on the electronic device, by using the photosensor, correct the illuminance value based on the data related to the incident angle of the light, determine the brightness of a first part of the display based on the corrected illuminance value, and determine the brightness of a second part of the display based on the illuminance value and the angle formed by the foldable housing.