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Research and Design of the Multi-purpose TFT-LCD Intra-panel Interface

Author: YangLei
Tutor: LeiZuoMing
School: Huazhong University of Science and Technology
Course: Software Engineering
Keywords: TFT-LCD High speed serial interface TCON RSDS mini-LVDS PPDS
CLC: TN873.93
Type: Master's thesis
Year: 2009
Downloads: 50
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Abstract


As the most popular display technology, TFT-LCD is developing to larger size panels, higher resolutions and higher color depth. Since the display quality of TFT-LCD is impacted by the performance of the interface between Timing Controller (TCON) and Column Driver (CD), it has become the key of the TFT-LCD. Several intra-interface standards has been in existence, however, the interface on the TCON side is designed according with one specific standard. Therefore, the poor compatibility between TCON and CD has limited its applications.A large format TFT-LCD intra-panel interface is designed which can support RSDS, mini-LVDS and PPDS. Firstly, the structure of the system and the partition of digital and analog modules are determined based on the function of the interface. Secondly, digital functional module and analog circuit are designed respectively. The digital functional module TCON is employed by behavior design and the timing simulation results show that the TCON succeeds in generating correct data mapping and control signals in transmitter, CD and Row Driver (RD). The analog part is emphasized in the thesis. So the design process of the sub-module in the transmitter is presented in detail and corresponding Hspice simulation results are also shown in this paper. Finally, mix-simulation is performed to verify the function and performance of the interface. In this thesis, the greatest innovation is that the current source of the driver is adjustable and two independent loops (common-mode feedback and differential output voltage calibration loop) are introduced, then the electrical characteristics can be transformed correctly to meet the requirements of three interface standards and the data quality is improved.The simulation results of the interface in TSMC 90nm Mix-Signal Salicide(1.2V/3.3V) process show that the operating temperature range is -20℃~85℃. The maximal data rate that the interface can achieve in RSDS, mini-LVDS and PPDS is 200Mbps,400Mbps and 800Mbps respectively. The interface can self-adjust to keep the electrical characteristics of the output signal close to the value in the Spec under the variation of PVT and termination resistor, the maximum deviation of differential output voltage is just 3% under typical case. This proves that the interface has good reliability and stability.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Terminal equipment > Display device,the display > LCD monitors
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