LED Backlight Segmentation for Visible Light Communication
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Solution Overview
Problem
There is a need for a system and method to provide additional information to visible light communication terminals using an information display device with an LED backlight, particularly in public places where multiple users can select desired objects and receive relevant information efficiently.
Innovation Solution
A digital information display device with a display unit, a back light unit comprising multiple LEDs, and a controller that configures a basic frame with additional information for each object, allowing users to select objects and receive information through visible light communication by controlling the LEDs to transmit data in a visible light form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If additional information is provided to multiple users through a display device, then information availability is improved, but data transmission time and system complexity increase
Solution Approach 1:
The display device segments the display area into multiple regions, each corresponding to a different user. The controller transmits different additional information to different users simultaneously by controlling light emission in different regions, thereby reducing data transmission time while maintaining information availability for all users.
Solution Approach 2:
The system dynamically switches the light emission regions based on user position and information requests. The controller adjusts which light sources emit information in real-time, enabling efficient data transmission to multiple users without increasing overall transmission time.
2Loss of information
If additional information is provided to multiple users through a display device, then information availability is improved, but system complexity increases
Solution Approach 1:
The display device uses its existing light emission capabilities for dual purposes: displaying visual information to users and transmitting additional information via light communication. This multi-functionality avoids adding separate communication hardware, thereby maintaining information availability while minimizing system complexity.
Solution Approach 2:
The display device leverages its own light emission system to provide communication functionality. The controller utilizes the same light sources that illuminate the display to transmit information, eliminating the need for external communication devices and reducing overall system complexity.
3Productivity
If brief information is provided on desired objects, then data transmission efficiency is improved, but completeness of information decreases
Solution Approach 1:
The controller first transmits brief additional information about desired objects to users before providing complete information. This preliminary action allows users to quickly access key information while maintaining transmission efficiency, and the complete information can be provided subsequently when needed.
Solution Approach 2:
The system provides partial information (brief additional information) when transmission efficiency is prioritized, and complete information when information completeness is prioritized. This flexible approach allows the system to adapt the level of information provision based on user needs and transmission conditions.
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 efficient data transmission by providing brief information on desired objects and additional information on all objects across the screen, allowing multiple users to receive data quickly and effectively using visible light communication terminals.
Implementation Method 1
a back light unit including a plurality of light sources located in a back surface of the display unit
Implementation Method 2
providing additional information to a visible light communication terminal by using an information display device having a Light Emitting Diode (LED) backlight
Data Source
AI summary
A method and apparatus for providing additional information to a visible light communication terminal through visible light communication by an information display device having a back light unit is provided. The method includes, when the visible light communication terminal is located in one area corresponding to at least one additional information providing area that is disposed within a screen of the information display device, receiving time slot information allocated to the one area through the visible light communication, when the visible light communication terminal is located in remaining areas of the at least one area corresponding to the at least one object, except for the one area, receiving additional information on all objects from the remaining areas through the visible light communication, and acquiring additional information on the object corresponding to the one area from among the additional information on all the objects by using the allocated time slot information.