A 1.4-Gbps intra-panel interface with low-power and low-EMI schemes for Tablet PC applications

An intra-panel interface addressing all of the high-speed, low-power, and low-electromagnetic interference (EMI) requirements for tablet personal computer applications is presented. This work proposes an adaptive clock window scheme to achieve 1.4-Gbps data-rate. For EMI suppression, data scrambling, horizontal blank period pattern scrambling, and novel clock and data recovery circuit are introduced. Lastly, for power-saving, the proposed interface dynamically biases source driver's output buffers and employs early charge sharing by controlling the configuration data. For verification, a WQXGA thin-film transistor liquid crystal display system is implemented with the timing controller and source driver ICs that are fabricated using 65-nm and 180-nm complementary metal-oxide semiconductor (CMOS) processes, respectively. The liquid crystal display system demonstrates maximum operation speed of 1.4 Gbps and suppression of EMI noise in LTE Band-20 and GSM 850 bands. The proposed power-saving schemes achieve 4.3% reduction in total power consumption by source driver IC, which reaches about 85% of power consumption by enhanced reduced-voltage differential signaling interface circuit.