FPC Design Guidelines for Enabling High-Speed Intrapanel Interface in Large-Size LCD TVs

In this letter, we propose flexible printed circuit (FPC) design guidelines for high-speed signal implementation in large-size and high-resolution liquid crystal display (LCD) TV modules by analyzing signal integrity (SI) characteristics through simulation and measurement. We observed that designing an FPC for LCD TV modules that can minimize insertion loss (IL) and crosstalk in the channel is critical to successfully implementing multi-Gb/s signal characteristics in large-size and high-resolution LCD TV modules. To prove this experimentally, we investigated the trends of IL, impedance, and crosstalk, which are design parameters of simulation-based FPCs, and designed four FPC samples assuming their application to the intrapanel interface module of a real 75-in LCD TV. Then, based on the measured S-parameter model, the SI performance was verified and compared by measurement and simulation to demonstrate the validity of the proposed design guidelines. In conclusion, to achieve the SI characteristics of FPCs in LCD TV modules, it is necessary to consider minimizing IL and mitigating crosstalk more than any other electrical performance by enabling the differential P/N pairs to have a strong coupling relationship.