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Liquid crystal display with function of visible light communication

A technology of liquid crystal display and visible light communication, applied in the direction of static indicators, instruments, etc., can solve the problems of changing brightness, affecting the display effect of the display, image brightness drift, etc., and achieve the effect of increasing bandwidth and enriching the use function

Inactive Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the optical communication process, the brightness of the backlight source will continue to change, which will affect the display effect of the entire display, resulting in adverse consequences such as image brightness drift

Method used

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  • Liquid crystal display with function of visible light communication

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Embodiment 1

[0031] Such as figure 1 As shown, this embodiment discloses a liquid crystal display with a visible light communication function, including a backlight source, a liquid crystal screen, and a visible light coupling device. The structure of the liquid crystal display is the same as that of the traditional liquid crystal display. The backlight source can be a side-type backlight source or a direct-type backlight source, and the light source can be CCFL or LED. The backlight is placed behind the LCD screen to provide stable enough brightness. The general structure of the liquid crystal screen is similar to that of the traditional liquid crystal screen, including the control circuit, TFT array, liquid crystal layer and color filter film. The visible light coupling device is designed before the LCD drive circuit, and its function is to couple the video signal and the visible light signal to form a drive signal to drive the liquid crystal layer. Generally, the visible light couplin...

Embodiment 2

[0033] This embodiment includes the process of using liquid crystal torsion to control brightness changes disclosed in embodiment 1, thereby converting electrical signals into optical signals; the difference is that the entire liquid crystal panel area can be used as a window for visible light signal emission, which can At the same time, each pixel in the liquid crystal panel is controlled to emit light of different gray levels and colors, increasing the system bandwidth of visible light communication.

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Abstract

The invention discloses a liquid crystal display with a function of visible light communication, and the liquid crystal display comprises a backlight source, a liquid crystal screen, and a visible light coupling device. The liquid crystal screen comprises a control circuit, a TFT array, a liquid crystal layer and a color filter film, wherein the control circuit, the TFT array, the liquid crystal layer and the color filter film are connected sequentially. The backlight source is connected with the liquid crystal screen. The visible light coupling device is connected with the liquid crystal screen. The visible light coupling device enables a video signal and a visible light signal to be coupled. An electric signal of the visible light coupling device controls the voltage of the TFT array through the control circuit. The voltage of the TFT array controls the torsion of liquid crystal molecules of the liquid crystal screen, and the torsion of liquid crystal molecules of the liquid crystal screen controls the luminous flux of the backlight source, thereby enabling the electric signal to be converted into a light signal. A function of visible light communication is integrated into the liquid crystal display, thereby increasing the product functions of the liquid crystal display, and providing a new network access port for persons.

Description

technical field [0001] The invention relates to a liquid crystal display technology, in particular to a liquid crystal display with a visible light communication function. Background technique [0002] Liquid crystal displays are widely used in TVs, mobile phones, computers, etc. Since liquid crystal is a material that cannot emit light, liquid crystal displays need to add a backlight under the liquid crystal to present images. Most of the backlight sources on the market mainly adopt the side-light structure. In this structure, the LED light source is installed on the side of the liquid crystal panel, and the light emitted by it is converted into a surface light source by the light guide plate and provided to the liquid crystal panel. Since the LED light source has a fast switching time, information transmission can be realized by controlling the brightness of the LED light source, that is, visible light communication. Therefore, by controlling the LED on the backlight sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/36
CPCG09G3/2096G09G3/36
Inventor 文尚胜陈颖聪关伟鹏向昌明
Owner SOUTH CHINA UNIV OF TECH
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