Rolling Shutter Camera Interference Suppression via Display Shutter Control
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Solution Overview
Problem
Rolling shutter cameras used in web conferencing and video calls often experience interference fringes in captured images, which affect image quality.
Innovation Solution
A display system comprising a transparent display device, a rolling shutter camera, a shutter, and a control device, where the display device operates in a one-frame period with sub-frame periods for image display and transparency, and the shutter controls light exposure to the camera, blocking light during image display sub-frame periods and transmitting light during transparency sub-frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a rolling shutter camera is used to capture the subject, then the system can capture images through the transparent display, but interference fringes occur in the captured images
Solution Approach 1:
The display device performs periodic switching between transparent state and image display state. The transparent sub-frame periods are distributed at different timings across multiple one-frame periods, creating a periodic pattern that allows the rolling shutter camera to capture uniform brightness images without interference fringes
Solution Approach 2:
The invention changes the temporal distribution parameter of transparent sub-frame periods. By starting transparent sub-frame periods at different timings in different one-frame periods (rather than at the same timing), the exposure timing relative to the rolling shutter scan is varied, eliminating the systematic interference pattern
2Manufacturing precision
If the display device operates with sub-frame periods for image display and transparency, then uniform brightness images can be captured, but the system complexity increases
Solution Approach 1:
The display device performs multiple functions: it displays images during first sub-frame periods and acts as a transparent window during second sub-frame periods. This multi-functionality is achieved within the existing display device architecture without requiring separate components, thereby managing complexity while achieving uniform brightness capture
3Manufacturing precision
If the shutter blocks light during image display sub-frame periods, then interference fringes are suppressed, but the light transmission time is reduced
Solution Approach 1:
The shutter performs periodic opening and closing operations synchronized with the display device's sub-frame periods. It blocks light during image display periods and transmits light during transparent sub-frame periods, creating a periodic light transmission pattern that suppresses interference fringes while maintaining adequate exposure time
Solution Approach 2:
The shutter is controlled in advance to block light before the image display sub-frame periods begin and to open before transparent sub-frame periods begin. This preliminary action ensures that light transmission is optimized during the transparent periods when the rolling shutter camera is capturing images
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
The system suppresses the occurrence of interference fringes in images captured by rolling shutter cameras, ensuring images with uniform brightness across the entire image area.
Implementation Method 1
a light emitting element... during a first sub-frame period, a period in which the light emitting element is turned on and an image is displayed
Implementation Method 2
controls the operation of the shutter to block light traveling toward the camera during the first sub-frame period
Implementation Method 3
during a second sub-frame period, a period in which the light emitting elements is not turned on and the display area is made transparent
Data Source
AI summary
According to one embodiment, a display system includes a display device, a rolling shutter camera, a shutter and a control device. The display device includes a display area and a light emitting element. The rolling shutter camera is arranged behind the display device. The shutter is arranged between the display device and the camera. The control device controls the operation of the shutter to block light traveling toward the camera during a first sub-frame period during which the light emitting element is turned on and an image is displayed on the display area, and to transmit light traveling toward the camera during a second sub-frame period during which the light emitting elements is not turned on and the display area is made transparent.