Scott V. Johnson

Towards a low-cost high-quality carbon-nanotube field-emission display

We have developed field-emission-display technology driven by chemical-vapor-deposition-grown carbon-nanotube emitters incorporated in a simple, low-cost device structure. Here, we report on frit-sealed test displays with a brightness of 3000 cd/m 2 at 3 kV and a lifetime of 9000 hours with only 45% degradation. We also demonstrate the scalability of the technology with a uniform high-brightness 6-in. QVGA that displays video images with a switching voltage of 40 V.

Nano‐emissive display technology for large‐area HDTV

— Using nano-emissive display (NED) technology, Motorola labs has successfully developed 5-in. full-color display prototypes. Carbon-nanotube-based field-emission displays with a pixel size of 0.726 mm for a 42-in. HDTV exhibit video image quality comparable to CRT displays and demonstrate a luminance of 350 cd/m2. These novel low-drive-voltage NEDs take advantage of selective growth of CNTs to obtain the desired electron-emission performance while maintaining inexpensive manufacturing due to a simple self-focusing and self-regulating planar structure. Improved video image quality and color purity are achieved with very low power consumption and without the need for an expensive focusing grid.

63.2: High Brightness, High Voltage Color Field Emission Display Technology

We have designed nanotube-based field emission displays to operate above 6500 V. As a result, we have improved the white-screen luminance of HDTV resolution (0.726 mm pixel) field emission displays beyond 700 cd/m2. We have maintained good color purity without employing separate focusing electrodes. In addition, we demonstrate spacers operating beyond 10,000 volts on the anode without any charging that would distort the image.

19.1: Distinguished Paper: Towards A Low Cost High Quality Carbon Nanotubes Field Emission Display

We have developed field emission display technology driven by Chemical Vapor Deposition grown carbon nanotube emitters incorporated in a simple, low cost device structure. Here we report in frit-sealed test vehicles 3000Cd/m2 brightness at 3kV, a lifetime of 7500 hours with only 40% degradation. We also demonstrate the scalability of the technology with a uniform, high brightness, 6″ QVGA cathode array showing video images with a switching voltage of ∼ 50 V.

Dynamic studies on the charging of spacers for high-voltage field-emission displays

— In this article, a systematic study on the relationship between the rate of spacer surface-charge accumulation and the anode voltages in a dynamic setting is presented. The spacers are placed in a test package simulating a field-emission panel where electron trajectories are recorded along a preset timeline. True secondary emission of spacers under the influence of an anode field is then deduced and the factors affecting the rate of charge accumulation on the spacer surface are discussed. The results of invisible spacers under different operating conditions of anode voltage, emission current, and pulse width will also be given.