Visible Light Communication Display Backlight Frame Ordering
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Solution Overview
Problem
Existing display devices using visible light communication technology face challenges in reliably decoding visible light communication signals due to variations in the order of transmission frames and synchronization issues with the drive frequency of liquid crystal panels and frame rates of image sensors, leading to incomplete reception of data blocks.
Innovation Solution
A display device employing the Carousel method to generate and output multiple transmission frames with varying block orders for each signal unit, ensuring that all blocks can be decoded by adjusting the number of transmission times based on the proportion of high-brightness regions and distance from the receiver, and inserting blanks to prevent synchronization with the liquid crystal panel's drive frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission frames are sent in a fixed order, then the transmission process is simple, but the receiver cannot reliably decode all blocks due to synchronization issues and variations in reception timing
Solution Approach 1:
The patent applies dynamics by making the transmission frame structure adaptive rather than fixed. The visible light communication signal processor dynamically generates multiple transmission frames with different block arrangements based on reception timing variations. This allows the system to adapt to synchronization issues between the liquid crystal panel drive frequency and image sensor frame rate, ensuring reliable decoding of all blocks despite timing variations.
Solution Approach 2:
The patent changes the parameter of block arrangement order in transmission frames. Instead of maintaining a fixed block order, the system generates multiple transmission frames where the arrangement of blocks varies between frames. This parameter change ensures that even if synchronization issues cause some blocks to be missed in one frame, the same blocks appear in different positions in other frames, enabling reliable reception and decoding.
2Reliability
If the number of transmission frames is increased to ensure all blocks are received, then decoding reliability improves, but the communication time and energy consumption increase
Solution Approach 1:
The patent applies partial action by transmitting only the necessary number of transmission frames required to ensure complete block reception. Instead of continuously transmitting excessive frames, the system determines the optimal number of frames based on the total number of blocks and reception timing characteristics. This ensures sufficient redundancy for reliable decoding while minimizing unnecessary transmission time and energy consumption.
3Manufacturing precision
If transmission frames are synchronized with the liquid crystal panel drive frequency, then display quality is maintained, but the receiver may miss blocks due to frame rate mismatches
Solution Approach 1:
The patent applies segmentation by dividing the communication signal into multiple blocks that are distributed across multiple transmission frames. Each transmission frame contains a subset of blocks arranged in different orders. This segmentation allows the receiver to accumulate blocks from multiple frames even if synchronization causes some blocks to be missed in individual frames, ensuring complete signal reconstruction.
Solution Approach 2:
The patent changes the block arrangement parameter in each transmission frame to compensate for synchronization issues. By varying the order and positioning of blocks across frames, the system ensures that blocks appear at different temporal positions, making the reception less sensitive to precise synchronization requirements while maintaining display quality.
Data Source
AI summary
A display device of the present disclosure is a display device capable of outputting, by a Carousel method, a visible light communication signal including a plurality of signal units. The display device includes a display panel that displays a video signal, a visible light communication processor that encodes the signal units, divides the encoded signal units into a plurality of blocks, generates a plurality of transmission frames by using the plurality of blocks, and uses the generated transmission frames as a backlight control signal, and a backlight that illuminates the display panel from the back surface of the display panel based on the backlight control signal. With regard to the plurality of transmission frames corresponding to one of the signal units generated by the visible light communication processor, an order of the plurality of blocks is different between at least two of the transmission frames.