Tablet PCs feature large screen size, high power consumption of display modules, and integrated high-performance processing chips, making multi-layer PCB stacking design the key to balancing signal integrity, heat dissipation and board thickness. Different from mobile phone HDI boards, tablet PC PCB stacking focuses more on layer rationalization, power supply stability and overall structural flatness. Most mainstream tablet PC PCBs adopt 6–10 layer stacking structures, which need to reasonably divide signal layers, power layers and ground layers to avoid signal crosstalk and power supply interference.

The core difficulty of stacking design lies in the isolation of high-speed signal layers and power ground layering optimization. Tablet PCs integrate high-speed interfaces such as MIPI display interface, USB-C and Wi-Fi 6 signal lines. These high-frequency signals are extremely sensitive to crosstalk, so the stacking design must adopt the classic “signal-ground-power-ground” isolation structure. High-speed signal layers must be closely attached to the complete ground layer to form a stable reference plane, reducing signal attenuation and electromagnetic radiation. Unreasonable layer spacing will lead to impedance mismatch, resulting in display screen flicker, network signal instability and other faults.

Board thickness control and heat dissipation matching are also critical design points. Tablets have strict requirements on body thickness, so the dielectric layer thickness of each PCB layer needs precise customization. Excessively thin dielectric layers will reduce insulation performance, while overly thick layers will fail the thinning requirement. In addition, the main control chip and display driving chip of tablets generate concentrated heat. The stacking design needs to arrange the power layer and copper foil grounding layer near the heat source to form a heat dissipation channel. It is necessary to avoid stacking multiple signal layers above high-heat components to prevent high temperature from affecting signal transmission stability and component service life.

Moreover, stacking design needs to adapt to structural assembly differences. The edge keys, camera modules and battery avoidance positions of tablets require localized layer reduction and hollow-out design. The overall stacking structure must maintain uniform rigidity to prevent board warpage during SMT mounting and daily use, ensuring assembly yield and long-term structural stability.