Display Brightness Control with Historical Illuminance References
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Solution Overview
Problem
Display devices installed outdoors face challenges in accurately adjusting brightness due to inaccurate illuminance readings caused by external factors, leading to mismatched brightness levels with the surrounding environment.
Innovation Solution
The display device incorporates an illuminance sensor, memory, and processors to store and analyze historical illuminance data, identify representative values, and adjust brightness based on comparisons and thresholds, ensuring accurate adaptation to environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display device uses real-time illuminance sensor readings to adjust brightness, then the brightness can respond quickly to environmental changes, but the illuminance readings become inaccurate due to external factors affecting the sensor
Solution Approach 1:
The system performs preliminary actions by collecting illuminance data over multiple dates and times before actual brightness control. Historical illuminance values are stored and processed to identify representative values that filter out temporary anomalies caused by external factors, ensuring accurate brightness adjustment while maintaining responsive performance
Solution Approach 2:
The system implements feedback mechanisms by comparing real-time illuminance readings with historical representative values. When the difference exceeds a threshold, the system requests additional readings and uses statistical processing to determine the accurate illuminance level, thereby maintaining both responsiveness and measurement precision through continuous validation
2Measurement precision
If the display device collects illuminance data multiple times to filter out inaccurate readings, then the brightness control accuracy improves, but the time required for brightness adjustment increases
Solution Approach 1:
The system performs preliminary data collection and processing by gathering illuminance values over multiple dates and storing them in advance. Representative illuminance values are pre-calculated using statistical methods (mean, median, or mode), so when brightness adjustment is needed, the system can quickly reference pre-processed data rather than collecting and analyzing raw data in real-time
Solution Approach 2:
The system dynamically adapts its data collection strategy based on environmental conditions. When illuminance readings are stable and within acceptable ranges, the system uses fewer sampling points. When readings show significant variation or exceed thresholds, the system automatically increases sampling frequency and applies more rigorous statistical processing, optimizing the balance between accuracy and time consumption
3Measurement precision
If the display device stores historical illuminance data for analysis, then the brightness adjustment accuracy improves, but the device complexity increases
Solution Approach 1:
The system extracts only the essential and representative features from historical illuminance data rather than storing and processing all raw data points. By calculating representative illuminance values (mean, median, or mode) for different time periods and storing only these aggregated values, the system maintains high brightness adjustment accuracy while significantly reducing data storage requirements and processing complexity
Solution Approach 2:
The system changes parameters by transforming raw illuminance data into representative values using statistical methods. This parameter transformation reduces the dimensionality and complexity of the data while preserving the essential information needed for accurate brightness control, enabling efficient storage and processing without sacrificing measurement precision
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 enhances the display's ability to dynamically match brightness to the surrounding illuminance, minimizing errors and providing optimal visibility by leveraging historical data and adaptive control mechanisms.
Implementation Method 1
obtain an illuminance value through the illuminance sensor
Data Source
AI summary
A display device includes a display and an illuminance sensor. The display device obtains an illuminance value through the illuminance sensor, identifies a representative illuminance value corresponding to the time at which the illuminance value is obtained among the plurality of representative illuminance values for each time stored in the memory. The display device, based on a difference between the obtained illuminance value and the identified representative illuminance value being greater than or equal to a preset threshold value, obtains another illuminance value through the illuminance sensor and compares the another illuminance value to the identified representative illuminance value. The display device, based on a difference between each illuminance value of the plurality of illuminance values obtained a preset number of times and the identified representative illuminance value being greater than or equal to the preset threshold value, controls a brightness of the display.