Ambient Light Sensor Accuracy Under Screen Luminance Interference
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Solution Overview
Problem
As screen ratios increase in terminal devices, placing an ambient light sensor on the lower layer of the screen poses challenges due to the sensor's interference from the screen's luminance, affecting its ability to accurately sense ambient light intensity.
Innovation Solution
A method and apparatus that acquire a brightness value from the ambient light sensor and a luminance value of the screen, using a preset display area to determine the ambient light brightness value by calculating a brightness difference and considering the screen's transmittance, to improve accuracy in ambient light sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the ambient light sensor is placed below the screen to accommodate high screen ratio, then the screen ratio is improved, but the measurement precision of ambient light sensing deteriorates due to screen luminance interference
Solution Approach 1:
The patent segments the screen area into a preset display area that affects the sensor and other areas. By calculating the luminance value specifically for the preset display area and subtracting it from the sensor's brightness value, the method isolates the ambient light component from the screen luminance interference, thereby resolving the measurement precision issue while maintaining the high screen ratio design
Solution Approach 2:
The patent applies local quality by focusing on the specific preset display area below the sensor rather than the entire screen. The luminance calculation is localized to this specific region, and the subtraction process targets only the local interference from this area, preserving ambient light measurement accuracy while allowing the rest of the screen to maintain high screen ratio design
2Device complexity
If the ambient light sensor is placed below the screen, then the device structure is simplified, but the reliability of ambient light detection deteriorates due to light interference from the screen
Solution Approach 1:
The patent extracts the screen luminance interference component from the sensor's total brightness reading. By calculating the luminance value of the preset display area and subtracting it from the sensor's brightness value, the method separates the desired ambient light signal from the unwanted screen luminance interference, thereby improving detection reliability while maintaining the simplified below-screen sensor structure
Solution Approach 2:
The patent introduces an intermediary calculation process that computes the luminance value of the preset display area as a mediator between the screen and the sensor. This intermediary value represents the screen's contribution to the sensor reading and is used to correct the measurement, thereby ensuring reliable ambient light detection despite the simplified below-screen sensor placement
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 effectively enhances the accuracy of ambient light brightness value acquisition by accounting for both sensor readings and screen characteristics, even with high screen ratios, ensuring precise environmental light measurement.
Implementation Method 1
an ambient light sensor is placed below the display screen. The ambient light sensor is used to detect the brightness of the ambient light
Data Source
AI summary
The present disclosure relates to a method and apparatus for acquiring an ambient light brightness. The method includes acquiring a brightness value monitored by the ambient light sensor; acquiring a luminance value of the screen of the terminal device; and determining an ambient light brightness value of an external environment based on the brightness value and the luminance value.