Visible Light Communication Reducing Red Component Afterglow
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Solution Overview
Problem
Visible light communication systems face efficiency deterioration due to afterglow characteristics in monitors using phosphors like fluoride red (KSF) phosphor, which affect communication efficiency and can prevent communication establishment.
Innovation Solution
A visible light communication device and method that acquire and process image signals to reduce the influence of the red component, either by dynamically selecting images with reduced red content or adjusting PWM duty ratios, allowing communication to proceed even with monitors exhibiting afterglow characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a monitor using KSF phosphor is used as a light source for visible light communication, then the red coloring and chromaticity are improved, but the afterglow characteristics adversely affect communication efficiency
Solution Approach 1:
The system performs preliminary detection of afterglow characteristics before communication, and pre-adjusts the image signal to reduce or eliminate the red component during periods when afterglow would interfere with communication signaling
Solution Approach 2:
The patent changes the parameter composition of the image signal by reducing or eliminating the red color component (R component) in specific regions or time periods when afterglow would interfere with communication, thereby adapting the illumination characteristics to maintain both display quality and communication efficiency
2Productivity
If the red component is reduced in the image signal, then communication efficiency is improved, but the red coloring quality of the display is degraded
Solution Approach 1:
The display screen is divided into different regions with different functions: a first image area for normal display purposes and a second image area (communication area) where the red component is reduced or eliminated to enable reliable visible light communication without afterglow interference
Solution Approach 2:
Different parts of the display have different color compositions: the first image area maintains full color quality for display purposes, while the second image area has reduced or eliminated red component specifically for communication purposes, allowing each region to optimize for its specific function
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 solution effectively mitigates the impact of afterglow on communication efficiency, enabling reliable visible light communication without requiring special handling on the receiving device, thus improving communication stability and efficiency.
Implementation Method 1
a sampling rate faster than that of a conventional method is realized by utilizing the line scan characteristic of a CMOS type image sensor
Implementation Method 2
A wireless communication technology that uses light in a wavelength band visible to human eyes as a carrier is known as visible light communication
Data Source
AI summary
A visible light communication device is a visible light communication device capable of communicating with an other communication device, and includes an image acquisition unit and an image processing unit. The image acquisition unit acquires a first image signal including an R component, a G component, and a B component, the first image signal being output based on a communication signal of a visible light communication. The image processing unit outputs a second image signal in which an influence of the R component of the first image signal is reduced during the visible light communication with the other communication device.