Led display applications increasingly widespread, as the display equipment need to display the contents of the varied also, display the output format as much, this article mainly introduces the led display
of the current mainstream video interface.
1, AV input interface AV interface (
Also called the RCA standard video input interface)
Is a kind of interface appears earlier, the red, white and yellow lines, the yellow line for video transmission line, red white is responsible for the voice of the left and right channel transmission.
Commonly used RAC lotus head to connect.
AV interface to realize the video and audio transmission, respectively, to avoid the two types of mixed signal interference caused by the image quality.
But because this kind of interface transmission is a kind of luminance/chrominance (
Y / C)
Hybrid video signal, need further bright color separation and chroma decoding to imaging, inevitably resulting in loss of color signal, and ultimately affect the output image quality.
In short, the AV interface to separate the audio and video transmission, avoids the mutual interference.
But there's still a transmission loss, so the hd video playback basic have abandoned the AV interface.
2, VGA input interface VGA interface USES the asymmetric distribution of 15 pin connection mode, principle of work is to memory stored in digital format of image signal in a RAMDAC (
Through simulation made in high frequency signal, and then output to the LED screen image.
Because the VGA video signal is decomposed into R, G, B three primary colors and HV line field signal transmission, so in the transmission loss is fairly small.
Have VGA interface without crosstalk, and the advantages of no synthetic separation circuit losses.
3, DVI input interface DVI interface is mainly used for computer connection, with discrete graphics display computer RGB signals.
DVI digital interface to transmit all USES the digital format, no interference in the process of transmission signal is introduced, guarantee the transmission quality of the host to the LED screen, can get a clearer picture.
4, HDMI input interface HDMI (
Is formulated based on the DVI technology, is a fully digital image and sound transmission interface, can be no compression of audio and video signal transmission.
HDMI can provide 10 gbit/s data transmission bandwidth, and meet the requirements of high-definition.
At the same time HDMI interface without digital -
Digital transformation, can ensure the high quality of audio signals.
HDMI cable can transmit audio signals, can be used to avoid digital audio wiring.
In addition, in the input interface of led display and S -
Video, Video input interface, BNC interface, color RS -
Categories such as 232 c serial port, because is replaced by a high-definition interface, limited to the space is not introduced.
In conclusion, as people more and more high to the requirement of display quality, analog transmission is replaced by a hd, quality such as 4 k also believe that the near future will be wonderful display on led display.
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