Display Color Pattern Modulation for VLC Data Transmission
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Solution Overview
Problem
Existing visible light communication (VLC) methods require separate receivers, making them inconvenient for general users to use, and struggle with efficiently transmitting large amounts of data in a short time.
Innovation Solution
A VLC method where a display device transmits data using modulated visible light signals through color and pattern changes, allowing a camera-equipped device to receive and extract data using techniques like SS-CSK, SCAM, and VTASC modulation, even when the devices are not aligned or at a distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate visible light communication receiver is used, then data transmission can be achieved, but device complexity and user convenience deteriorate
Solution Approach 1:
The patent applies universality by enabling the display device itself to function as both the transmitter and receiver of visible light communication signals. The display can modulate light to transmit data and also capture light signals through its photodetector capabilities, eliminating the need for separate dedicated communication receivers and making the device accessible to general users with standard smartphones
Solution Approach 2:
The patent merges the communication transmission and reception functions into a single display device. By integrating the light emission (display) and light detection (photodetector) capabilities within the same device, it combines previously separate functions into one unified system, reducing overall system complexity
2Reliability
If traditional VLC methods are used, then communication can be established, but data transmission speed and efficiency deteriorate
Solution Approach 1:
The patent transitions from traditional one-dimensional (on/off) light modulation to two-dimensional color space modulation. By utilizing the RGB color dimensions and their combinations, the system can encode multiple bits of information simultaneously in each light state, significantly increasing the data transmission rate while maintaining communication reliability
Solution Approach 2:
The patent changes the modulation parameter from simple intensity variation to color composition variation. By modulating the RGB color parameters and their intensity ratios, the system expands the information capacity of each transmission state, enabling faster data transmission without compromising communication stability
3Productivity
If color and pattern modulation are used, then data transmission capacity increases, but signal detection difficulty increases
Solution Approach 1:
The patent implements feedback mechanisms where the receiving device sends acknowledgment signals and the transmitting device adjusts its modulation based on received signal quality. This feedback loop enables real-time optimization of the color and pattern modulation schemes, making high-capacity transmission more detectable and reliable
Solution Approach 2:
The patent uses preliminary synchronization and calibration procedures before actual data transmission. The devices establish color space mappings and modulation parameters in advance, creating a predefined framework that simplifies subsequent signal detection and reduces the complexity of real-time signal extraction
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 rapid transmission of large data amounts without the need for additional receivers, using camera-equipped devices like smartphones or smart watches, improving usability and data transmission rates.
Implementation Method 1
With the recent development of light-emitting diode (LED) technology, VLC is being continuously developed.
Implementation Method 2
receiving, by the reception device, the visible light signal through the camera and extracting the transmission data
Data Source
AI summary
A visible light communication (VLC) method in which a transmission device having a display transmits a signal to a reception device having a camera according to the present invention includes outputting, by the transmission device, a visible light signal including data for transmission (referred to as “transmission data” below) through the display using at least one of a color and a pattern, and receiving, by the reception device, the visible light signal through the camera and extracting the transmission data.