Study Of Novel Structure Low Voltage Drived Carbon Nanotubes Field Emission Displays

Obviously, the efforts to develop field emission displays (FEDs) have got a lot of achievements over the last decade, especially since the introduction of the carbon nanotube field emission displays (CNT-FED). But in respect to TFT-LCD and PDP, in FED several technical issues have to be overcome, such as lifetime, spacers, luminance, electron emission uniformity, modulation voltage range, modulation method. Also a low manufacturing price is required. In this work, the research contents include fabrication of large area carbon nanotube emitters, fitting with the display. The design of the novel structure CNT-FED is based on electron hopping, on thick film CNT-FED device fabrication process and on design of a simple driver system using pulse width modulation.This paper describes two methods to fabricate the large diagonal sized carbon nanotube (CNT) emitters. These are traditional spraying (with an airbrush) and screen printing. The experimental results show that airbrush spraying makes the turning-on field of all CNT emitter cathode lower, but emission uniformity is poor. The fabrication process of spraying is simple and low-cost; however it also causes serious pollution and waste. Screen printing is a popular approach to fabricate the large sized CNT emitters. Our experimental results with screen printing reveal that the emission uniformity of screen-printed CNT emitters is much better than those fabricated by air-spraying. Based on simulation and experiments, this paper discusses the relationship between the density of CNT emitters, the applied field and the emission current density. Our conclusion is that the density of the CNT emitters must be optimized in order to achieve a high emission current density at a low applied field Owing to the emission uniformity, multi-gray scale (16-32) a video display (diode structures) is realized using pulse width modulation. The main control board is designed. FPGA and Flash memory are used on the digital driver system.Using the LG..PHILIPS development design platform, novel structures CNT-FED with HOP Spacers are designed and discussed in this work. Single HOP-Spacer-gate structures and double-HOP-Spacers with multi-electrodes structures are described.From this work a novel multi-electrode structure is proposed and described in this paper. In this new structure the HOP Spacers consist of thin mild steel perforated plates (shadow-mask plates) in which the inside of the holes are coated with an MgO film. The new structure acts in the same way as the traditional glass HOP funnels. Also experiments are discussed in this paper out to replace MgO by MgF2 and SiO2. The complete fabrication process of thick film CNT-FED is studied, including manufacturing process of the front and back panels, manufacturing process of novel multi-electrodes structure, sealing process and aging process. Some experimental results obtained on this new structure are discussed.