Optical Wireless Communication via Multi-Frequency Backlight Modulation
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Solution Overview
Problem
Existing optical wireless communication systems face challenges with high power consumption and reduced image brightness when operating in low-brightness modes due to high-frequency backlight signal modulation schemes, which limit their ability to achieve low power consumption and high data capacity.
Innovation Solution
The system employs a frame rate controller and timing controller to modulate multiple frequencies for different scan regions of the display panel and backlight module, where each frequency is a multiple of another, allowing for efficient data transmission without increasing power consumption or reducing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency backlight signal modulation scheme is used for optical wireless communication, then data transmission capacity is improved, but power consumption increases and image brightness decreases
Solution Approach 1:
The backlight module is divided into multiple independent backlight regions, each capable of being driven at different frequencies. This segmentation allows the system to transmit multiple data streams simultaneously at different frequency rates, increasing overall data capacity without requiring all regions to operate at high frequencies, thus reducing total power consumption.
Solution Approach 2:
The system dynamically assigns different driving frequencies to different backlight regions based on communication requirements. The timing controller can adjust which regions operate at higher frequencies for data transmission and which maintain lower frequencies for normal display, optimizing the balance between data capacity and power consumption in real-time.
2Productivity
If high-frequency backlight signal modulation scheme is used for optical wireless communication, then data transmission capacity is improved, but image brightness is reduced
Solution Approach 1:
By segmenting the backlight module into multiple regions with independent frequency control, the system can maintain high brightness in regions operating at lower frequencies while using high-frequency modulation only in specific regions for data transmission, thus preserving overall image brightness while achieving high data capacity.
Solution Approach 2:
Different backlight regions are assigned different quality characteristics in terms of driving frequency. Regions designated for data transmission operate at high frequencies, while other regions maintain standard or low frequencies for optimal brightness, creating local quality variations that satisfy both communication and display requirements.
3Device complexity
If single frequency is used for driving backlight regions, then system complexity is reduced, but data transmission capacity is limited
Solution Approach 1:
The backlight module is segmented into multiple regions that can be driven at different frequencies, enabling parallel data transmission channels. This segmentation multiplies the effective data capacity without requiring a complete redesign of the control architecture, as the timing controller can manage multiple frequencies through coordinated scanning of different regions.
Solution Approach 2:
The same backlight module structure serves multiple functions: it can be driven at a single frequency for standard display operation or at multiple frequencies simultaneously for enhanced data transmission. This multi-functionality allows the system to adapt to different operational modes without requiring separate hardware systems.
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 enables low power consumption and high data capacity while minimizing image flicker and signal discontinuity, maintaining brightness and reducing power consumption, even in low-brightness modes.
Implementation Method 1
a backlight module (26) configured to provide light for operating the display panel (30)
Data Source
AI summary
An optical wireless communication system includes a display panel, a frame rate controller, a backlight module, and a timing controller. The display panel includes a glass substrate, and the frame rate controller is configured to modulate multiple frequencies. The timing controller is configured to drive different scan regions of the glass substrate using at least a first frequency and a second frequency among the multiple frequencies and/or drive different backlight regions of the backlight module using at least a third frequency and a fourth frequency among the multiple frequencies for transmitting optical data. The first frequency is different from the second frequency, the third frequency is different from the fourth frequency, the value of the second frequency is a multiple of the value of the first frequency, and the value of the fourth frequency is a multiple of the value of the third frequency.