Under-Display Ambient Light Detection Using Periodic Black Frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ambient light sensors installed under the display screen of mobile devices require a specific field of view, limiting the usable display area and affecting user experience by preventing parts of the screen from displaying images, and components like optical proximity sensors and front-facing cameras reduce the screen-to-body ratio.
Innovation Solution
A method where the ambient light sensor is positioned under the display screen, allowing the entire screen to be used for image display by controlling specific areas to show black pictures intermittently for light detection, enabling automatic luminance adjustment based on ambient light intensity without affecting display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an ambient light sensor is installed under the display screen, then ambient light detection capability is improved, but the display area is reduced because part of the screen cannot be used for picture display
Solution Approach 1:
The patent applies periodic action by controlling the display screen to intermittently display black pictures in specific areas, creating periodic time windows during which the ambient light sensor can detect ambient light without continuous obstruction. This allows the sensor to periodically measure ambient light intensity while minimizing impact on the display area.
Solution Approach 2:
The patent uses preliminary action by pre-defining specific display areas (first area and second area) and their respective functions before operation. The first area is designated for ambient light detection while the second area maintains normal display functionality, allowing the system to operate with optimized resource allocation from the start.
2Ease of manufacture
If optical proximity sensors and front-facing cameras are located below the non-display area, then these components can be disposed, but the screen-to-body ratio is reduced
Solution Approach 1:
The patent applies dimensionality change by moving the ambient light sensor from the traditional front-facing position (requiring non-display area) to a position under the display screen. This spatial reconfiguration in the vertical dimension allows the sensor to operate without reducing the screen-to-body ratio, as it utilizes the space beneath the display rather than reducing the display area itself.
3Measurement precision
If the first area displays black picture intermittently for light detection, then ambient light can be detected accurately, but display continuity is affected
Solution Approach 1:
The patent implements periodic action by creating regular intervals where the first area displays black pictures, allowing the ambient light sensor to periodically detect ambient light. This periodic interruption is designed to be brief and rhythmic, enabling accurate measurement while maintaining overall display functionality during the non-interruption periods.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the second area continues to display picture content continuously without interruption, while only the first area intermittently displays black pictures. This allows the display system to maintain overall functionality and user experience while enabling ambient light detection in the first area.
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
Enables full-screen image display with ambient light-based luminance adjustment, improving user experience by maintaining consistent screen brightness and reducing the need for additional components that reduce the screen-to-body ratio.
Implementation Method 1
a first ambient light sensor, where the first ambient light sensor is located under the display screen
Data Source
Figure 1a
Figure 1b
Figure 2a~2b
AI summary
This application relates to the field of communications technologies, and provides ambient light and optical proximity detection methods, a photographing method, and a terminal, so that an entire display screen of the terminal is used to display a user interface, and this improves user experience. The method specifically includes: controlling, by a terminal, some areas of a display screen to display a black picture for a plurality of times; and when the areas display the black picture, obtaining an intensity of ambient light detected by an ambient light sensor to adjust luminance of the display screen.