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Digital TFT (thin film transistor) screen driver board circuit of video intercom system

A technology of intercom system and screen driver board, which can be used in closed-circuit television systems, instruments, static indicators, etc. Effect

Inactive Publication Date: 2012-05-02
FUJIAN GUANLIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, video intercom indoor units generally have defects such as unclear image display and large clutter interference.

Method used

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  • Digital TFT (thin film transistor) screen driver board circuit of video intercom system
  • Digital TFT (thin film transistor) screen driver board circuit of video intercom system
  • Digital TFT (thin film transistor) screen driver board circuit of video intercom system

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Embodiment Construction

[0012] see figure 1 , is a schematic diagram of the overall structure of the digital TFT screen driver board circuit of the video intercom system terminal according to the present invention, including a video signal processing circuit and a driver board circuit, and the driver board circuit includes a central processing chip HTV791, DC power management Module, backlight LED driver, TFT digital screen, brightness and color adjustment module and FLASH module, the video signal input is filtered by the video signal processing circuit, and then output to the HTV791 chip of the driver board circuit, DC power management module, backlight LED driver, The TFT digital screen, brightness and color adjustment module and FLASH module are all connected to the central processing chip HTV791, and the DC power management module also supplies power for the backlight LED driver and the TFT digital screen.

[0013] like figure 2 , is the video signal processing circuit diagram of the digital TF...

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Abstract

The invention provides a digital TFT (thin film transistor) screen driver board circuit of a video intercom system. The digital TFT screen driver board circuit comprises a video signal processing circuit and a driver board circuit, wherein a video signal is input into the video signal processing circuit so as to be filtered and then is output to the driver board circuit, and the video signal processing circuit comprises a 'phi'-type filter circuit. Compared with the prior art, the digital TFT screen driver board circuit provided by the invention adopts a Huaya micro HTV791 chip as main image processing of a dot screen, a 'phi'-type filter circuit is additionally arranged at a video input port, and high frequency interference on a transmission line can be effectively filtered; and finally an image displayed on the TFT screen is obviously clearer than a like product.

Description

technical field [0001] The invention relates to a digital TFT screen driving board, in particular to the application of the digital TFT screen driving board in a video intercom system terminal. Background technique [0002] At present, video intercom indoor units generally have defects such as unclear image display and large clutter interference. The video of the intercom system is transmitted from the outdoor station. Due to the long transmission line and the influence of the environment, some clutter interference signals will inevitably be brought into the indoor unit, and the image finally displayed on the TFT screen of the indoor unit will be unclear and blurred. Clutter interference, only some special processing can suppress the interference and make the image clearer. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a digital TFT screen driver board circuit of a video intercom system terminal that can effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36H04N7/18
Inventor 张陈欣林利煌官发辉朱锦雄谢礼龙洪群青
Owner FUJIAN GUANLIN TECH
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