Time-Division Multiplexed Visible Light Communication for Public Displays
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Solution Overview
Problem
Visible light communication systems that use two-dimensional codes on large displays, such as advertisements, impair the appearance of public images by occupying space, limiting their effectiveness in conveying information to a wider audience.
Innovation Solution
A communication system that uses a transmission device to output and display a public image and a private image in a time division multiplexed manner, with a reception device capable of shooting the private image using a sync signal, allowing for the extraction of information without impairing the public image's appearance, and enabling easy access to various contents by users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a two-dimensional code is displayed on a large display to enable visible light communication, then information can be transmitted to users, but the appearance of the public image is impaired
Solution Approach 1:
The display is segmented into multiple regions: a public image display region and a private image display region. The two-dimensional code is displayed only in the private image region, allowing information transmission without affecting the public image appearance in the public region.
Solution Approach 2:
The patent introduces a spatial dimension by dividing the display into public and private regions, and a temporal dimension by using time-division multiplexing to switch between displaying public images and private images with codes, enabling information transmission without compromising public image appearance.
2Loss of information
If a two-dimensional code occupies a portion of the displayed image, then information can be conveyed, but the effectiveness of conveying information to a wider audience is limited
Solution Approach 1:
Different regions of the display have different functions: the public image region provides visual information for general audience, while the private image region contains two-dimensional codes for targeted information conveyance. This local differentiation allows both broad appeal and targeted information delivery.
Solution Approach 2:
The display system serves multiple functions simultaneously: it displays public images for general consumption and embedded two-dimensional codes for information transmission. The system can adapt to different viewing scenarios - public viewing sees only public images, while targeted viewing can capture the codes for additional information.
3Shape
If time division multiplexing is used to display public image and private image, then the public image appearance is maintained, but the complexity of the transmission device increases
Solution Approach 1:
The patent combines the public image display and private image display functions into a single display device controlled by a unified control unit. The time-division multiplexing controller integrates the switching logic, synchronizer, and image signal processing into a coordinated system, reducing overall complexity compared to separate display systems.
Solution Approach 2:
The system uses a sync signal that provides feedback about the timing and status of image display to coordinate the public and private image switching. This synchronization mechanism ensures proper timing without requiring complex manual control, simplifying the overall system operation.
Data Source
AI summary
A transmission device displays a public image (a first image) provided to unspecified users, a private image (a second image) provided to particular users, and a mask image of the private image in a time division multiplexed manner, and transmits a private image sync signal synchronized with display of the private image. A reception device receives the private image sync signal transmitted from the transmission device and shoots by a shooting unit the private image displayed on the transmission device by using the private image sync signal, and displays the shot image on a display unit.