Introduction to the interface classification standard of LCD display

by:Kimeery     2021-08-30
Theoretically speaking, since LCD displays are purely digital devices, digital interfaces must replace analog interfaces. However, most LCD displays on the market currently use analog signal interfaces. The fundamental reason is the inconsistency of specifications and standards. At present, the technical standards for digital interfaces are gradually being unified. More and more display chips have the ability to support digital video output. Graphics card manufacturers are beginning to integrate digital display interfaces on graphics cards. Below we will introduce three video digital interface standards one by one. ① The Pu0026D Digital Plug-and-Display (Pu0026D) standard was formulated by the Video Electronics Standards Committee (VESA), but when the standard was released in 1997, it had been greatly out of touch with the actual situation at the time. For example, the display signal interface defined in the Pu0026D standard is a multi-functional interface that can transmit digital and analog signals at the same time. Signal transmission is superfluous, and no graphics card manufacturer is willing to add such an expensive and useless interface to their products. It is precisely because of VESA's delay in failing to produce a decent standard. Many companies have jointly launched their own standards with their partners, making the current situation of digital interface standards chaotic. ② The DFPDFP-Digital Flat Panel Group standard is an industry standard proposed by Compaq. The 20-pin DFP interface can support a maximum resolution of 1280X1024. A large company that supports the DFP standard is Canada’s ATL, which produced the first graphics card with a DFP interface. Later, VESA also selected the DFP interface as the transition of the Pu0026D standard. In fact, as long as you compare the function definitions of the two interface standards, you will find that there is no big difference between the two. In the definition of electrical performance, the two are completely the same. The DFP standard removes the expensive and impractical options in the original Pu0026D interface standard, such as USB, IEEE 1394, etc., so the DFP standard is cheaper when it is implemented. Much. However, the DFP standard only supports a resolution of 1280X1024, and the inherent defect of insufficient resolution makes the DFP interface impossible for too long. ③ DVIDVI-Digital Visual Interface interface can transmit digital signals and analog signals, and the resolution achieved can also be much higher. This standard was proposed by the Digital Display Working Group (DDWG). Many companies that support the DVI standard are also supporters of the original DFP standard. Subsequently, VESA also accepted the DVI standard. From the perspective of technological development, the future of the DVI interface is bright because it can support resolutions above 1280X1024, and can also transmit analog video signals, so that CRT displays can also be applied to the DVI interface.
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