Liquid Crystal Panel Optical Modulation for Visible Light Communication
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Solution Overview
Problem
Current visible light communication technologies that combine display panels with optical communication systems adversely affect the service life of the backlight and can be harmful to human eyes due to flickering.
Innovation Solution
An optical communication system that uses a light-emitting display screen and a liquid crystal panel, where the liquid crystal panel is located at the light emission side and a control circuit generates a driving voltage to twist liquid crystal molecules based on a presetting encoding rule related to a target deflection angle, allowing polarized light beams to be deflected and transmitted without requiring backlight flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If visible light communication technology uses high-speed twinkling signals from light emitting devices to transmit information, then communication speed and frequency spectrum are improved, but the service life of the backlight deteriorates and it becomes harmful to human eyes
Solution Approach 1:
The patent divides the backlight system into two independent parts: a stable backlight source for illumination and a liquid crystal panel for optical modulation. The liquid crystal panel is segmented into multiple encoding regions that can be independently controlled to modulate light without affecting the backlight's service life.
Solution Approach 2:
The liquid crystal panel serves as an intermediary between the stable backlight and the communication channel. It modulates the optical signals by changing the polarization state of light in different encoding regions, enabling high-speed communication without requiring the backlight itself to flicker or change intensity.
2Speed
If visible light communication technology uses high-speed twinkling signals from light emitting devices to transmit information, then communication speed and frequency spectrum are improved, but eye strain from flickering increases
Solution Approach 1:
The liquid crystal panel is divided into multiple encoding regions that can be independently modulated. This segmentation allows communication signals to be transmitted through spatial modulation rather than temporal flickering, eliminating eye strain while maintaining communication speed.
Solution Approach 2:
The patent replaces the mechanical/temporal flickering mechanism with an optical polarization modulation mechanism. Instead of changing light intensity over time (which causes flickering), the system uses liquid crystal molecules to change the polarization state of light, which can be detected without causing visual discomfort.
3Adaptability or versatility
If a liquid crystal panel is added to the light emission side of the display screen, then optical communication capability is improved, but device complexity increases
Solution Approach 1:
The liquid crystal panel serves multiple functions simultaneously: it acts as both a display element and an optical modulator for communication. The same liquid crystal molecules that control display pixels also modulate light for communication purposes, eliminating the need for separate communication hardware.
Solution Approach 2:
The patent merges the display function and communication function into a single integrated system. The liquid crystal panel structure is designed to perform both display and optical modulation, combining what would traditionally be separate functions into one unified component.
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 solution prevents the degradation of the backlight's service life and reduces eye strain from flickering, while maintaining the original color and brightness of the display and ensuring high-quality display performance.
Implementation Method 1
a control circuit, configured to generate, according to a presetting encoding rule, a driving voltage that controls liquid crystal molecules of the liquid crystal panel to be twisted
Implementation Method 2
a polarized light beam emitted from the light-emitting display screen passes through the liquid crystal panel driven by the driving voltage, and then is deflected according to the target deflection angle
Data Source
AI summary
An optical communication transmitting device, an optical communication receiving device, a method, and a system are provided. The optical communication transmitting device includes: a light-emitting display screen, a liquid crystal panel, and a control circuit; the liquid crystal panel is located at a light emission side of the light-emitting display screen; the control circuit is configured to generate, according to a presetting encoding rule, a driving voltage that controls liquid crystal molecules of the liquid crystal panel to be twisted, and the presetting encoding rule is related to a target deflection angle, wherein a polarized light beam emitted from the light-emitting display screen passes through the liquid crystal panel driven by the driving voltage, and then is deflected according to the target deflection angle, and then is transmitted to an optical communication receiving device.