Under-Display Ambient Light Sensor Frequency Synchronization
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Solution Overview
Problem
Ambient light detection under a display screen is compromised by leaked light from the screen, leading to inaccurate readings due to frequency offsets between the display screen and the sensor.
Innovation Solution
A method that dynamically monitors and adjusts the main frequency of the sensor to match the display screen's frequency, ensuring accurate ambient light detection by eliminating the influence of leaked light through adjustments in sampling parameters such as frequency and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light sensor is disposed under the display screen to increase screen-to-body ratio, then the screen-to-body ratio is improved, but the detection accuracy of ambient light deteriorates due to leaked light from the screen
Solution Approach 1:
The patent segments the light detection process into two distinct components: leaked light detection and ambient light detection. By separating these functions and processing them differently, the system can accurately distinguish between light from the display and ambient light, resolving the measurement precision issue while maintaining the high screen-to-body ratio design
Solution Approach 2:
The patent introduces frequency domain analysis as an intermediary mechanism to separate leaked light from ambient light. By transforming the time-domain signal into frequency domain, the system can identify and remove the leaked light component (which has a specific frequency corresponding to the display refresh rate) before calculating the ambient light intensity
2Measurement precision
If the main frequency of the sensor is adjusted to match the display screen frequency dynamically, then the ambient light detection accuracy is improved, but the device complexity increases due to frequency monitoring and adjustment mechanisms
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the display screen's main frequency and dynamically adjusts the sensor's sampling frequency to match. This closed-loop approach ensures that the frequency synchronization is maintained automatically, improving detection accuracy while keeping the complexity manageable through automated control
Solution Approach 2:
The patent changes the sampling parameter (frequency) of the sensor dynamically based on the detected display screen frequency. By adjusting this key parameter in real-time, the system adapts to frequency variations without requiring complex hardware modifications, thus improving accuracy while controlling 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 approach improves the accuracy of ambient light detection by correcting frequency offsets and minimizing the impact of leaked light, resulting in reliable and precise ambient light measurement.
Implementation Method 1
The light sensor can detect ambient light in the environment where an electronic device is located
Implementation Method 2
when the display screen emits light, which results in inaccurate ambient light detection results
Data Source
AI summary
A method for detecting ambient light under a display screen includes: acquiring first sampling data of a sensor under a first sampling parameter; acquiring a current main frequency of the display screen; determining whether the first sampling data is valid according to the current main frequency and a standard main frequency of the display screen; adjusting the first sampling parameter as a second sampling parameter according to the current main frequency and the standard main frequency, when the first sampling data is invalid; acquiring second sampling data of the sensor under the second sampling parameter; and determining intensity of the ambient light according to the second sampling data. The method of the present application can effectively avoid an ambient light detection error caused by the offset of the main frequency of the display screen or the sensor, and improve accuracy of the ambient light detection.