Digital printing is based on a relatively sophisticated computer data processing technology. It combines organic technologies such as laser modulation and scanning imaging technology with high-tech photographic materials and new printing inks, enabling computer-controlled digital integration of the entire printing process. It is a modern printing system with a completely different concept and process than traditional printing.

Among them, laser modulation scanning imaging technology is mainly used in the mechanism version. The color separation data signal (monochrome pixel digital signal) is input to the laser controller during the plate making, so that the emission synchronous monochrome laser beam is converted into the screen data by the RIP. The stencil of the printing plate is subjected to laser modulation and scanning imaging, and the photosensitive material on the roller is sensitized to form a pattern capable of adsorbing ink or toner, and the printing can be printed.

The principle of different plate-making with the printing plate photosensitive material can be roughly divided into two categories: one is the laser electrostatic imaging type. Such as Indigo E-print1000 and Omnius digital presses. The other type is a silicon-based rubber type offset type. Such as Heidelberger's Quickmaster DI (Rapid) and KBA and Safran's 74 Karat digital presses.

The digital printing equipments all have substantially the same laser modulation scanning imaging system. Argon ion lasers and semiconductor lasers are commonly used in the system lasers, and the acousto-optic crystals of the acousto-optic modulators are lead molybdenum (PbMoO4) electro-acoustic devices. The transistor is lithium niobate (LiNbO3). The modulator is still an important and indispensable core device for transferring graphic information.

Digital printing is an important symbol of modern printing. Personalize on-demand printing. That is, the realization of dynamic or variable image printing will have a major impact on the traditional printing process. Another revolution in traditional printing, it involves a variety of high-tech such as computer information processing technology, laser technology, materials science and so on. They are a whole organic combination. Therefore, laser technology should also be one of the indispensable high technologies for promoting modern printing.