Carbon Nanotube Fed Drive System

Field Emission Display (FED) is one of the cathode ray fluorescent display devices, falls into the catalogue of flat p anel display (FPD). Nowadays, FEDs using nano-carbon tubes as cathode ejecting materials are the most hotspot for research. Its driver circuit, containing high technology, occupies a big percent in the whole cost of device.This paper analyzes the difference in structure between flat panel display and traditional CRT, whose pixel structure and corresponding driver circuit are quite different from each other. As one of the FPDs, CNT -FEDs adop t matrix scanning as dynamic display method and realize grayscales by voltage pulse width modulation (PWM). The whole driver system includes connection circuit, logic controlling circuit, data storage circuit and line & row driver circuit.This paper desig ns a dynamic display driver circuit for diode 7 -segment number FEDs with all anodes connected together . Using logic control signals generated from CPLD of main control circuit to control the high voltage MOSFETs switch circuit for cathode to realize scanning display.This paper designs the driver circuit for dynamic character and image display according to matrix FED. As for 32 × 32 FEDs, on the basis of simple MOSFET driver circuit, using a couple of MOSFETs to overcome the defect of long charge time and realize the dynamic character shifting. Anode voltage floating technology is used to increase the driver voltage of circuit and brighten the display screen. As for 64 X 64 and 96 × 72 FEDs, driven by separate components and line & row driver chips, separately realizes the character scrolling and dynamic image of 16 grayscales, using FPGA inside memory and outside EPPROM for cathode data storage respectively.In the end of the paper, we discuss the video display system. On the basis of original driver system, introducing video decode system to form a relatively integral video display system. Using video decode board SV1600 to translate VGA signals from DVD machine to separate RGB signals for driver circuit, taking the higher 4 bits of the 8 bits data in program to realize the 16 grayscales image display in 96×72 FEDs.