MULTILAYER PCB

Multilayer PCB is a circuit board that has more than two layers.
Unlike a Double-Sided PCB which only has two conductive layers of material, all multilayer PCBs must have at least three layers of conductive material which are buried in the center of the material.

How Are Multilayer PCBs Made?
Alternating layers of prepeg and core materials are laminated together under high temperature and pressure to produce Multilayer PCBs. This process ensures that air isn't trapped between layers, conductors are completely encapsulated by resin, and the adhesive that holds the layers together are properly melted and cured. The range of material combinations is extensive from basic epoxy glass to exotic ceramic or Teflon materials.

The figure above illustrates the stackup of a 4-Layer/ multilayer PCB. Prepeg and core are essentially the same material, but prepeg is not fully cured, making it more malleable than the core.The alternating layers are then placed into a lamination press. Extremely high temperatures and pressures are applied to the stackup, causing the prepeg to "melt" and join the layers together. After cooling off, the end result is a very hard and solid multilayer board.

Benefits of Multilayer PCBs (compared to single or double-sided PCBs)
Higher assembly density
Smaller size (considerable savings on space)
Increased flexibility
Easier incorporation controlled impedance features.
EMI shielding through careful placement of power and ground layers.
Reduces the need for interconnection wiring harnesses (reduces overall weight)

Amitron is an Experienced Multilayer PCB Manufacturer
Amitron has been producing Multilayer PCBs for over 20 years. Over the years, we have seen all types of multilayer constructions from various industries, answered all types of multilayer questions, and solved all types of problems with multilayer PCBs.

Do you buy an LCD Advertising Screen or an OLED Advertising Screen? They have two major differences!

In the current market, the major brands of billboards are also the pursuit of the Advertising screen material. Most of the screens are LCD Advertising screens and OLED Advertising screens. Some users think that the screen of OLED is better, and some users think that The LCD Advertising screen is better. So today we are talking about buying billboards to choose LCD Advertising Display or OLED? Many people are mistaken, they have two major differences! Let’s take a look.

The first difference: the screen display effect of the OLED is different from the screen display effect of the LCD. OLED's screen display color effect will be more vivid, higher saturation, LCD screen display color effect is relatively dark, mainly because it is not self-lighting, is issued by another backlight, so for this color The display is definitely different. Some users will think that the display quality of OLED will be much better, but some users will feel that such color saturation is too high, so that the color is somewhat distorted, not the color of the color itself, and this high saturation. The mobile phone is prone to visual fatigue for a long time, and now many users use the screen for a long time, so the screen material of the OLED will be more harmful to the eyes. Although the LCD screen material display effect is general, but at least for our visual impact is not so obvious, fatigue is not particularly serious, long time with the screen compared to the OLED screen, the LCD screen is better .

The second difference: the screen cost of the OLED screen and the LCD is different, and the life span is different. LCD screens are less expensive to produce, and OLED screen production costs are relatively high, so if the screen of the advertising machine is broken, the cost of repairing the OLED screen is much higher than the screen maintenance cost of the LCD. And the screen life of OLED is still relatively short.
Summary: In general, both have their own advantages and disadvantages.