What is the difference between a high-density HDI circuit board and a printed circuit board?

　How to distinguish high-density interconnect HDI circuit boards and printed circuit boards? Because printed circuit boards are not general end products, the definition of the name is a bit confusing. In custom PCB circuit board proofing, many people often confuse high-density HDI circuit boards and printed circuit boards. What is the difference between them?

　　Since the circuit board is equipped with integrated circuit components, it is usually called an IC board, but it is not essentially the same as a printed circuit board. Under the premise that electronic products tend to be multi-functional and complex, the contact distance of integrated circuit components is reduced, and the signal transmission speed is relatively increased. With the increase in the number and length of wiring, the distance between points is getting closer and closer, so it is necessary to adopt high-density interconnection technology (HDI) to achieve this goal.

Basically, double-sided wiring and cross-connection are difficult, so the trend towards high-multilayer, high-precision circuit boards is unstoppable; and due to the continuous increase of lines, more power supply layers and grounding layers are provided for the design The necessary means. For the electrical requirements of high-speed signals, the circuit board*** provides impedance control with AC power characteristics, high-frequency transmission capabilities and reduction of unnecessary radiation (EMI). In order to reduce the quality of signal transmission, insulating materials with low dielectric coefficient and low attenuation rate are used to meet the requirements of miniaturization and arraying of electronic components. The density of circuit boards is constantly increasing to meet demand. Therefore, most circuit board operators refer to such products as "high-density circuit boards" or HDI boards.