There' s no distinction on screen itself, using the same glass substrate. Good LCD will adopt digital and simulated driving circuit (that is with DVI and D-SUB interface), and some low-cost LCD monitors, because the need to control costs, so only use simulated driving circuit (Only a D-SUB interface).

Driver IC of digital and simulating screens when lit are used digital signal, added to the pixel LCD screen are also digital signals. On the edge of Screen there are ranks of many driver IC, which is the so-called drive. Behind the screen in the main circuit board is controller, the controller will receive the signal converted to meet the requirements of the driver driving signal timing, given to drivers, lit the corresponding pixels.

It is now said from the LCD screen is the interface to distinct the digital screens and simulation; simulating screens can directly enter the analog signal, digital signal for digital screen.

Simulating screen has a more A / D converter, to convert analog signals to digital signals, with three primary colors analog signal input, the A / D converter completed on the circuit in the LCD screen.

Digital screens directly process digital signal to display, input the digital signal, RGB each color signals have been converting to a number of digital signals by video processing circuit directly into the on-screen control drive, A / D conversion is completed in front circuit. From the signal transmission digital screen can be divided into TTL, LVDS mode, and so on.

When use analog signals to transmit, the signals will be affected by the surrounding interference, affect transmission results. But digital signals will enable transmission signals more stable and have better results.