What is HDMI interface?
Date:2019-07-18
There are often some customers who choose the industrial LCD that need HDMI interface. Industrial LCD does not have HDMI interface. Only the board driving industrial LCD will have HDMI interface. Let's introduce what is HDMI interface for you?
HDMI (high definition multimedia interface) is a new digital audio and video interface. In the future, HDMI will replace the signal interface of various digital devices such as DVD DVD player, TV set-top box and display. This means that consumers can use only one signal line instead of several previous signal lines. You can use it to connect to a DVD player and a TV set. The new interface standard is jointly formulated by Hitachi, Panasonic, Philips, US commercial crystal, Sony, Thomson and Toshiba.
A standard HDMI interface cable
The biggest advantage of this new digital interface is that it can transmit audio and video data at the same time, which will bring the highest audio quality and painting experience to consumers. Today's digital audio can use light to transmit digital signals, but digital video devices like DVD players are using s terminals. It is a very popular analog signal interface. Of course, digital video interface has been available for a long time. Its name is DVI. You can usually see it on LCD.
There are three distinct differences between the latest HDMI interface and DVI interface. First, HDMI supports higher resolution than DVI. About twice as much resolution as HDMI can support today's HDTV. Second, DVI only supports video signal transmission, but audio signal is transmitted by another cable. HDMI can carry out simultaneous interpreting of audio and video digital signals. Third, the volume of HDMI interface is much smaller than that of DVI interface. What makes consumers happy is that HDMI is down compatible with DVI interface, that is, you can connect DVI devices with HDMI devices, and only a small adapter can be used in the middle. When users are fully upgraded to the new HDMI system, previous DVI devices can still be used.
HDMI can not only meet the current resolution of 1080p of the highest painting quality, but also support the most advanced digital audio formats such as DVD audio, support eight channel 96KHz or stereo 192Khz digital audio transmission, and only use one HDMI cable to connect, which can avoid digital audio connection. At the same time, the additional space provided by HDMI standard can be applied in the later upgraded audio and video format. Enough to cope with a 1080p video and an 8-channel audio signal. Because a 1080p video and an 8-channel audio signal require less than 4gbps, HDMI has a lot of margin. This allows it to connect DVD players, receivers, and PRR separately with a cable. In addition, HDMI supports EDID and ddc2b, so the devices with HDMI have the characteristics of plug and play. The signal source and display equipment will automatically negotiate and automatically select the most appropriate video / audio format.
