Ambient Light Detection Compensation for Under-Display Sensors
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Solution Overview
Problem
In full-screen electronic devices, light leakage from the backlight interferes with ambient light detection, leading to errors in illumination intensity measurement and affecting the dimming of the display screen, thereby impacting user experience.
Innovation Solution
An ambient light detection method that compensates the gray level value collected by a light sensor using an image grayscale value from the display screen, allowing for accurate determination of external ambient light intensity and adjustment of backlight brightness, switching between PWM and direct current dimming based on backlight levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light sensor is placed under the full screen to achieve higher screen-to-body ratio, then the display screen coverage is improved, but the light sensor detection accuracy deteriorates due to backlight interference
Solution Approach 1:
The patent extracts the backlight interference component from the total light signal detected by the light sensor. By obtaining the grayscale value of the display screen at the sensor position and calculating the corresponding gray level value, the system separates the backlight contribution from the ambient light signal, enabling accurate ambient light detection despite the sensor being positioned under the full screen
Solution Approach 2:
The patent introduces an intermediary calculation process that uses the display screen's grayscale value as a mediator to represent the backlight interference. This intermediary value is derived from the image grayscale value sent by the driving portion, converted through a preset mapping relationship to obtain the gray level value, which then serves as the basis for compensating the light sensor's detection results
2Adaptability or versatility
If the light sensor collects light signal under the display screen, then the ambient light detection function is maintained, but the illumination intensity measurement accuracy deteriorates due to backlight leakage
Solution Approach 1:
The patent implements a feedback mechanism where the display screen's grayscale value (which represents the backlight state) is fed back to the light sensor processing system. This feedback information is used to dynamically compensate the light sensor's detection results, allowing the system to accurately determine ambient light intensity while the light sensor remains positioned under the display screen
Solution Approach 2:
The patent converts the harmful backlight interference into a useful reference signal. By utilizing the grayscale value from the display screen driving portion, the system transforms the backlight leakage problem into a beneficial reference that, when properly processed through the mapping relationship and compensation calculation, enables accurate ambient light measurement
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 improves the accuracy of illumination intensity detection by accounting for backlight interference, ensuring optimal backlight adjustment and enhancing user experience by matching the display screen's brightness with the external environment.
Implementation Method 1
the light sensor collects the light to acquire illumination intensity
Data Source
AI summary
An ambient light detection method includes: in response to monitoring that a current backlight level of a display screen exceeds a preset backlight level threshold, acquiring an image grayscale value sent by a driving portion in the display screen; compensating a first gray level value collected by a light sensor by using the image grayscale value to obtain a current gray level value, the current gray level value being configured to represent a gray level corresponding to current external ambient light detected by the light sensor; and acquiring illumination intensity of the current external ambient light based on the current gray level value, the illumination intensity being used as a basis for adjusting backlight brightness of the display screen.