Under-Display Camera Timing Control for Light Interference
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Solution Overview
Problem
Conventional electronic devices with under-display cameras (UDC) suffer from image quality degradation due to light scattering and interference from the display panel, which affects the captured images.
Innovation Solution
The electronic device adjusts the display and camera driving information to prioritize the camera operation during the display's off-duty time, optimizing image capture by minimizing light interference through synchronized control of shutter speed, sensor gain, and display refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel is activated to display content, then the display function is improved, but light scattering and interference occur that degrade camera image quality
Solution Approach 1:
The display panel operates in periodic cycles with active periods (displaying content) and inactive periods (allowing camera capture). The controller coordinates the camera shutter timing with these periodic display cycles, capturing images during the inactive periods when no light is emitted from the display, thereby eliminating light interference while maintaining display functionality.
2Measurement precision
If the camera shutter speed is increased to capture clear images, then image quality is improved, but the exposure time exceeds the display off-duty time window
Solution Approach 1:
The controller dynamically adjusts the camera shutter speed parameter based on the display's off-duty time duration. When the off-duty time is limited, the shutter speed is increased (exposure time decreased) to fit within the available time window. The system may also adjust other parameters such as ISO sensitivity or aperture to compensate and maintain image quality within the constrained exposure time.
3Illumination intensity
If the display duty cycle is increased to improve visibility, then display performance is improved, but the available off-duty time for camera capture is reduced
Solution Approach 1:
The system dynamically adjusts the display duty cycle based on operational context. During camera capture modes, the duty cycle is reduced to provide sufficient off-duty time for exposure. During normal display modes, the duty cycle is increased for optimal visibility. The controller continuously monitors and adapts the duty cycle parameter to balance display performance with camera capture requirements.
Data Source
AI summary
An electronic device includes: a display; a camera; and a processor is configured to execute the instructions to: based on receiving a request to photograph an image using the camera in a state in which the display is driven, set a priority of the display and the camera; identify a shutter speed included in camera driving information set in the camera and an off-duty time in a duty cycle set in the display; based on the priority of the camera being set higher than the priority of the display and the shutter speed being identified to be longer than the off-duty time, adjust at least one of display driving information of the display or the camera driving information of the camera; and control to photograph an image within an off-duty time that has changed based on the adjusted at least one of the display driving information or the camera driving information.