LED Backlight Visible Light Communication Modulation
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Solution Overview
Problem
Current information display devices, such as Digital Information Displays, lack the capability to provide additional information through visible light communication using their LED backlight units, and there is a need for a method to manage and update this information effectively across a network.
Innovation Solution
An information display device with an LED backlight unit that receives content data from a server, determines if additional information is included, and outputs this information as a visible light signal through the LED backlight unit, allowing for bidirectional communication and efficient management of information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED backlight unit is used for display illumination, then display function is achieved, but visible light communication function is not provided
Solution Approach 1:
The LED backlight unit is designed to perform dual functions: display illumination and visible light communication. By modulating the LED emission based on additional information data, the same hardware component serves multiple purposes, enabling the display device to provide both visual content and communication services without adding separate transmission hardware.
Solution Approach 2:
The patent combines the display function and communication function into a single integrated system. The LED backlight unit that normally provides illumination for the display screen is merged with visible light communication capabilities, allowing additional information to be transmitted through the same physical medium used for display backlighting.
2Illumination intensity
If LED transmits visible light for display, then illumination function is achieved, but communication capability is lost
Solution Approach 1:
The LED backlight unit dynamically switches between display illumination mode and communication mode. During communication operations, the LED emission is modulated according to additional information data while maintaining sufficient illumination for display. This dynamic operation allows the system to adapt between providing steady illumination and transmitting information through light modulation.
Solution Approach 2:
The visible light communication is achieved through periodic modulation of the LED emission. The LED is controlled to emit light in periodic patterns that encode additional information, allowing communication to occur during display operation without continuous high-intensity emission, thus balancing illumination requirements with communication functionality.
3Loss of information
If additional information is separated from content data, then communication information is provided, but data processing complexity increases
Solution Approach 1:
The controller extracts additional information from the content data received from the server by separating it from the main display content. This extraction process identifies and isolates the communication data portion, allowing it to be transmitted through the LED backlight unit while the remaining content data is used for display purposes.
Solution Approach 2:
The controller acts as an intermediary that processes content data from the server, separates additional information from display content, and directs appropriate portions to different output channels (display screen vs. visible light transmission). This intermediary processing simplifies the overall system architecture by centralizing data management functions.
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 the provision of various additional information to a visible light communication terminal, enhancing the functionality of information display devices by using the LED backlight unit for visible light communication, and facilitating efficient management and updating of content across a network.
Implementation Method 1
Visible light communication is performed by transmitting, at a transmitter, visible light using a Light Emitting Diode (LED)
Implementation Method 2
outputting the additional information in the form of a visible light signal through an LED the LED backlight unit
Data Source
AI summary
A method provides additional information from a server to a visible light communication terminal through visible light communication in an information display device having a Light Emitting Diode (LED) backlight unit. To this end, if content data regarding an image output through a screen of an information display device is provided from a server, it is determined whether additional information regarding an object of the image is included in the content data, and if so, the additional information is acquired from the content data. The information display device controls light emission of an LED backlight unit of a display unit based on the additional information, thus performing visible light communication. As such, various additional information regarding an object of an image displayed at a particular position of a current screen of the information display device can be provided to a visible light communication terminal.