Display Light Emission Period Segmentation for VLC Signal Integrity
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Solution Overview
Problem
Conventional display methods face challenges in reducing communication errors without deteriorating image quality during visible light communication.
Innovation Solution
A display method that controls light emission periods in a frame to ensure the transmission of visible light communication signals, specifying a light emission period that is sufficient for signal units, allowing for continuous transmission without dividing image blocks and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emission period is extended to ensure complete transmission of signal units, then communication reliability is improved, but image quality deteriorates due to longer interruption of image display
Solution Approach 1:
The patent divides the light emission periods into multiple segments within each frame, designating specific segments for signal transmission while maintaining others for normal image display. This segmentation allows the light emission to be interrupted in a controlled manner that ensures complete signal unit transmission while preserving overall image quality by distributing the interruptions across multiple smaller periods rather than one long interruption.
2Manufacturing precision
If light emission is continuously controlled for image display, then image quality is maintained, but communication transmission reliability deteriorates due to fragmented signal units
Solution Approach 1:
The patent dynamically adjusts the light emission control by identifying and designating specific light emission periods for signal transmission based on the timing requirements of communication signal units. The controller adaptively selects which light emission periods to use for signal transmission, ensuring that each signal unit is transmitted during a sufficiently long continuous period while minimizing the impact on image display quality through optimized period selection.
3Speed
If multiple signal units are transmitted by dividing them across multiple light emission periods, then transmission speed increases, but communication errors increase due to incomplete signal unit transmission
Solution Approach 1:
The patent performs preliminary identification of suitable light emission periods for signal transmission before actual transmission begins. The controller determines in advance which light emission periods have sufficient duration to accommodate complete signal units, and designates these periods for transmission. This preliminary planning ensures that signal units are transmitted完整地 during designated periods, avoiding the errors that would result from dividing signal units across multiple insufficient periods.
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
This approach reduces communication errors while preventing significant deterioration of image quality by synchronizing light emission with signal transmission, ensuring reliable data transfer without compromising picture quality.
Implementation Method 1
transmitting the signal unit included in the visible light communication signal by luminance changing in the specified light emission period
Data Source
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AI summary
A display method capable of reducing the probability of communication error without causing significant deterioration of picture quality includes: specifying (SL21), as a specified light emission period, a light emission period in which light emission is performed for greater than or equal to a time required for transmitting a block included in a visible light communication signal, out of one or more light emission periods in which light emission is performed for displaying an image included in a video signal; and transmitting (SL22) the block of the visible light communication signal by luminance changing in the specified light emission period.