Cathode Preparation Of The Fed And Its Drive Circuit

Field emission display (FED) is a new-style active light-emitting Flat Panel Display (FPD) . It colligates the advantages of Cathode Ray Tube (CRT) and the other Flat Panel Display (FPD). So far, it has become the most potential device in FPD. Now the main problem of FED research is both the preparation of emission cathode and the design of driving circuit.In the thesis, carbon nano-tubes (CNTs) are synthesized by microwave plasma enhance chemical vapor deposition (MPCVD). The driving circuit of nixie tube and matrix FED was designed using CNTs as cathode. The main results of the thesis are as follows:1. The preparation of CNTs and study of its field emission propertiesThe experiment method to synthesize CNTs on porcelain substrate was explored by MPCVD, then the field emission properties of CNTs was studied. The results indicated the CNTs had excellent field emission character. The turn-on field is 1.16V/μm and the current density is 1.5mA/cm2 at 2.1 V/μm. It has good field emission capability with good stability and uniform emission points.2. The design of the driving circuit for nixie tubeThis paper designed the output high voltage driving circuit with single electronic elements and negative voltage at cathode based on FED's driving character and the designed circuit reduced the voltage of FED anode effectively .The circuit was tested and the result proved that the designed circuit worked stably and met the driving demand.3. Researching the driving circuit of matrix FEDAccording to matrix FED's character, matrix FED driving circuit was designed by using Altera company's complex programmable logic device (CPLD) and high-voltage, high-speed drive chip IR2110. The circuit realized scrolling characters display. All that we have done builds up theory and practice foundation for developing and researching FED driving circuit with gray degree.