Under-Display Ambient Brightness Sensor Signal Isolation
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Solution Overview
Problem
In full-screen terminals, determining ambient brightness accurately is challenging due to the difficulty in isolating the ambient light brightness from the display screen's brightness value, leading to low accuracy in ambient light determination.
Innovation Solution
A method and device that utilize a brightness sensor disposed under the display screen, where the integrated circuit outputs a control signal to control the display screen to display black, allowing the sensor to acquire optical signals for determining ambient brightness without needing the display screen's brightness value, improving accuracy by ensuring sufficient time for signal acquisition through controlled duty cycles and sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the brightness sensor is disposed under the display screen to obtain ambient brightness, then the display screen can occupy a larger area on the panel, but the brightness value of the display screen is difficult to obtain and the accuracy of the determined ambient light brightness value is low
Solution Approach 1:
The patent segments the light signal detection into two distinct phases: first detecting the combined light signal (ambient light plus display screen light) when the display is on, then detecting only the ambient light signal when the display shows black. By separating these measurements in time, the patent enables accurate isolation of the ambient light component from the total light signal.
Solution Approach 2:
The patent performs a preliminary action by displaying a black screen before or during the ambient light measurement process. This black screen state serves to eliminate the display screen's light contribution, allowing the brightness sensor to capture only the ambient light signal. This preliminary setup enables accurate ambient light detection without needing to mathematically separate the two light sources.
2Loss of information
If the brightness sensor converts the optical signal passing through the display screen into electrical signal to determine brightness value, then the terminal can acquire brightness information, but the accuracy is low due to inability to separate ambient light from display screen light
Solution Approach 1:
The patent implements periodic action by alternating between display-on and display-off (black screen) states at regular intervals. During the display-off periods, the brightness sensor periodically captures pure ambient light signals. This periodic switching enables the system to continuously update accurate ambient light measurements while maintaining normal display functionality during other periods.
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 accuracy of ambient brightness determination by isolating ambient light signals from display screen signals, improving the precision of ambient light measurement compared to existing methods.
Implementation Method 1
The brightness sensor can convert the optical signal passing through the display screen into the electrical signal
Data Source
AI summary
A method, a storage medium, and a device are provided for determining ambient brightness in the field of electronic technology. The method includes: outputting a control signal by the IC to the display screen, the control signal being configured to control brightness of the display screen; sending an instruction message by the IC to the brightness sensor when a level of the control signal is a first level, the first level being configured to control the display screen to display black, the instruction message being configured to instruct the brightness sensor to acquire an optical signal passing through the display screen; and determining an ambient brightness value by the brightness sensor based on the optical signal.