Light Source Driving Device Synchronization for Visible Light Communication
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Solution Overview
Problem
In visible light communication systems, multiple lighting apparatuses blinking at different timings can result in overlapping light rays, making it difficult for information terminals to recognize data signals due to timing differences in light emission control.
Innovation Solution
A light source driving device with a light emission control unit, communication circuit, and timer that synchronizes the start of light emission control by measuring a waiting time after receiving an instruction signal, ensuring all lighting apparatuses begin blinking at the same time, thus reducing timing differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lighting apparatuses perform visible light communication operations simultaneously without synchronization, then each apparatus can independently output data signals, but the data signal cannot be obtained in areas where light rays overlap due to timing differences
Solution Approach 1:
The timer starts measuring waiting time upon receiving the instruction signal, and the light emission control unit is configured to start light emission control at the end timing of the waiting time. This preliminary timing measurement ensures that all lighting apparatuses begin blinking simultaneously, eliminating timing differences before light rays overlap in space.
2Ease of operation
If lighting apparatuses blink at different timings, then individual light emission control is simple, but the data signal cannot be obtained in overlapping light ray areas
Solution Approach 1:
The timer acts as an intermediary component between the instruction signal reception and the light emission control execution. It introduces a standardized waiting time measurement mechanism that coordinates the timing of light emission across multiple apparatuses, ensuring data signal integrity without complicating the individual apparatus operation.
3Reliability
If synchronization timing is implemented by waiting for all apparatuses, then data signal recognition is improved, but response time increases
Solution Approach 1:
The waiting time parameter is precisely controlled to be the minimum necessary duration for synchronization, rather than an extended delay. This optimized parameter setting achieves reliable data signal recognition while minimizing the impact on response speed.
Data Source
AI summary
A light source driving device includes: a light emission control unit configured to control light emission of a light source in response to an instruction signal; a communication circuit which receives a first instruction signal instructing first light emission control for visible light communication; and a timer which starts to measure waiting time for executing the first light emission control, triggered by the reception of the first instruction signal. The light control unit starts the first light emission control of the light source in response to an instruction signal at the end timing of the waiting time.