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LCD Interface
2011-09-27 by seoer

Display and display interface is the interface between the host, usually with DVI, HDMI and 15-pin D-Sub in three ways:

DVI digital input: DVI (Digital Visual Interface, Digital Video Interface) is a Tsingtek display  devices in recent years with the development of a display interface developed. Ordinary analog RGB interface in the display process, the first graphics card in the computer through the digital / analog converter, the digital signal to analog signal transmission to the display device, and in digital display devices, but also by the analog / digital conversion convert analog signals into digital signals, and then display. After 2 conversion, inevitably resulting in some loss of information, the image quality to some extent. The DVI interface, the computer directly to the way digital signal will display information to the display device, avoiding the conversion process twice, so in theory, using the DVI interface display image quality to be better. Also DVI interface enables true plug and play and hot-swappable, eliminating the need to shut down the connection process in the computer and display equipment trouble. Now many are using this interface, LCD, CRT monitors use DVI interface ratio is relatively small. Be noted that, now that some LCD DVI interface with HDCP protocol for watching high-definition film and television copyright basis.

HDMI digital input: HDMI in English stands for "High Definition Multimedia", in Chinese means high-definition multimedia interface. HDMI interface can provide up to 5Gbps data transmission bandwidth, you can send uncompressed audio and high-resolution video signal. At the same time without the signal before transmission / A or A / D conversion, can guarantee the highest quality audio and video signal transmission. HDMI has the advantage of application: only need one HDMI cable, they can simultaneously transmit audio and video signals, unlike now need to connect multiple Xiancai; the same time, wireless D / A or A / D conversion, can achieve higher audio and video transmission quality. For consumers, HDMI technology not only provides a clear image quality, but the audio / video using the same cable that dramatically simplifies home theater system installation. HDMI interface with HDCP protocol for watching high-definition film and television copyright basis.

April 2002, Hitachi, Panasonic, Philips, Silicon Image, Sony, Thomson, Toshiba, a total of seven companies formed organizations began to develop a new HDMI dedicated to digital video / audio transmission standard. End of the year 2002, high-definition Multimedia Interface (High-definition Digital Multimedia Interface) HDMI 1.0 standards promulgated, to the end of 2006 has issued version 1.3, the main change is taking a step forward to increase the bandwidth to transfer a higher resolution and color depth . HDMI and DVI on the pin-compatible, but with a different package. Compared with DVI, HDMI can transmit digital audio signals, and adds support for HDCP, providing a better DDC optional features. HDMI supports 5Gbps data transfer rate, can be transmitted as far as 15 meters, sufficient to meet a 1080p video and an 8-channel audio signals. And because a 1080p video and an 8-channel audio signal needs less than 4GB / s, so HDMI there is a great margin. This allows it to be connected with a cable DVD player, receiver and PRR. In addition, HDMI supports EDID, DDC2B, it has a HDMI device has a "plug and play" feature, the signal source and display devices will automatically be "consultation" to automatically select the most appropriate video / audio formats.

15-pin D-Sub input interface: VGA port is also called, CRT color monitor as on the design and manufacture of reasons, can only receive analog signal input, including the most basic R \ G \ B \ H \ V (respectively red, green, blue, horizontal and vertical) five-component, no matter what type of interface to access the signal at least above the five components. Most of the most common PC-card interface D-15, the D-shaped three-row 15-pin socket, some of which are useless, the signal line is connected with the vacancy. In addition to the five essential components, the most important thing is the color LCD display in 96 years after DDC was also added into the data component, used to read the display EPROM recorded in the color monitor, model, production date, serial number, indicator parameters and other information content in order to achieve the required WINDOWS PnP (Plug and Play) function.


In addition to these three common interface, there is an ADC interface Mac display is a dedicated interface. The biggest feature is the data and power cables to do together, so only one line on the display, meet Apple refreshing fashion style.

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