Illuminance Measurement Algorithm for Display Interference
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Solution Overview
Problem
Existing electronic devices face challenges in accurately measuring illuminance due to light interference from the display and limitations in hardware structure changes, leading to inaccurate brightness adjustments and potential overcompensation by ambient light sensors.
Innovation Solution
An electronic device with a light-measuring sensor, display, and processor that calculates illuminance using different algorithms based on the ratio of off periods to the operation period and the frequency of the external light source, without requiring changes to the hardware structure, by analyzing synchronization signals and PWM signals to determine accurate on/off periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the illuminance sensor measures illuminance during the display off period, then the accuracy of illuminance measurement is improved, but if the minimum value of external light source overlaps the off period, the calculated illuminance value becomes low leading to incorrect brightness adjustment
Solution Approach 1:
The processor performs preliminary analysis of the external light source frequency and compares it with the display operation period before selecting the measurement algorithm. This preliminary action allows the system to proactively choose the appropriate algorithm (first or second) to avoid the problem of overlapping minimum values, ensuring reliable brightness adjustment while maintaining measurement accuracy
Solution Approach 2:
The system changes the measurement algorithm based on the frequency parameter of the external light source. When the frequency is lower than a reference value, the first algorithm is used; when it is higher, the second algorithm is used. This parameter-based adaptation resolves the contradiction by selecting the appropriate measurement approach for different lighting conditions
2Productivity
If the illuminance measurement time is set to be less than the display off period, then the measurement can be completed within the off period, but the measurement accuracy is reduced due to insufficient integration time
Solution Approach 1:
The system dynamically adjusts the measurement time and algorithm selection based on the display off period duration and external light source characteristics. The processor determines whether to use the first or second algorithm based on real-time analysis, allowing flexible adaptation between measurement speed and accuracy requirements for different operating conditions
3Measurement precision
If the display covers the illuminance sensor to reduce light interference, then the measurement accuracy is improved, but the hardware structure must be changed which increases manufacturing complexity
Solution Approach 1:
The patent replaces the mechanical/physical solution (modifying hardware structure to cover the sensor) with a software-based solution (using different measurement algorithms). The processor uses algorithmic approaches to eliminate light interference effects without requiring any physical modifications to the display or sensor structure, thereby maintaining measurement accuracy while avoiding increased device complexity
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 method allows for more accurate illuminance measurement and brightness adjustments, reducing costs and maintaining the existing hardware structure while improving measurement accuracy and user experience.
Implementation Method 1
measuring a plurality of illuminance values close to an off period of the display based on a synchronization signal of the display, and a plurality of illuminance values in the rest of the display operation period
Data Source
AI summary
A method and a device are provided. The device includes a light-measuring sensor, a display, a memory, and at least one processor operatively connected to the light-measuring sensor, the display, and the memory, wherein the at least one processor is configured to analyze the frequency of an external light source, obtain an operation period of the display, obtain a ratio of an off period of time of the display on the basis of the operation period, and calculate illuminance by using different algorithms on the basis of the relationship between the frequency of the external light source and the operation period and the ratio of the off period of time of the display.