Single-wall carbon nanotubes (SWNTs) were applied to electron emitters of field-emission displays (FEDs). Large-area FED devices with SWNT emitters were successfully fabricated in a diode mode using screen printing to demonstrate moving color images. They revealed excellent field-emission characteristics of a threshold electric field of approximately 2 V/µm. We have also investigated triode-type FED structures to achieve a high gray scale and high brightness. It was observed that electron emission from carbon nanotube emitters was controlled by the modulation of gate voltages.

Articles you may be interested inDisplacement current analysis of carrier behavior in pentacene field effect transistor with poly(vinylidene fluoride and tetrafluoroethylene) gate insulator Hole trapping phenomena in the gate insulator of As-fabricated insulated gate field effect transistors A program to solve the Poisson equation by a finite element method has been developed to simulate accurately the distributions of potential and electric field of the field emission microtriode. The emission current can be calculated by this method more accurately and efficiently than the finite difference method. Moreover, we can consider the effect of a gate insulator structure that cannot be treated by boundary element method. The optimal gate insulator is investigated from the viewpoint of the multilayer structure and the edge shape of the insulator. The emission current can be improved more than 85% using a gate insulator with a vertical edge shape and double-layer structure with different permittivities.

In this study, the field emission display with carbon nanotube emitter is developed for the large size HDTV application. Two structures for electron beam focusing are developed on the typical top-gate cathode. The metal grid and focusing gate structure are proved to be effective for the focusing. The data switching voltage for the double gate structure is lower than 30V which is competitive value in respect of the cost for driver electronics. The brightness and color gamut are comparable to those of the commercial product such as CRT.

The prototype of the field emission display with carbon nanotube emitter is developed in this study. The cathode structure is based on the typical top‐gate structure, and electron focusing gate and resistive layer are applied. To improve the brightness and color gamut of the prototype, new phosphor material, SrGa2S4: Eu, is adopted instead of conventional CRT‐green phosphor. By replacing the green phosphor, the prototype shows significant improvements in the brightness and color gamut. At the anode voltage of 7 kV and the anode current of 2∼3 μA/cm2, the brightness is higher than 600 cm/m2. The luminous efficiency of the prototype is about 7.7 lm/Watt. The images from color video operation of the prototype are shown.

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