Field Emission Displays FED

The field emission display held a particular fascination for this field, because of its potentially large market [36,44-49]. Field emission displays (FEDs) are flat panel displays, which are a flat panel equivalent of the cathode ray tube (CRT), but in which each pixel is addressed by its own electron beam from a field emitter, rather than having a beam scanned across it as in the CRT (Fig. 13.8) [44]. The emitters can be diode or triode type. The triode type is the most elegant, the diode type is lower cost. 

Process of chemical vapor deposition (CVD) is one of the most effective methods for preparation of flat emission cathodes. This method allows to produce different carbon structures on the cathode substrate. Depending on conditions of deposition, derivable carbon surface can be diamond-like films [1], amorphous graphite [2], various carbon constitutions, including carbon nanotubes [3], Investigation results of field emission properties produced cathodes have shown this is a promising technology for production Field Emission Display (FED). 

There are plenty of advanced products for phosphors used in tri-chromatic fluorescent lighting, phosphor converted light emission diodes (pcLED), X-ray imaging, specialty lamps, back lighting for liquid crystal displays (LCD), cathode ray tubes (CRT) for televisions and monitors, plasma display panels (PDF), projection televisions (PRT), and field emission displays (FED). 

Some other applications of these brand-new products include field emission displays (FED), CRT projection TV (PTV), various lighting and medical imaging applications. 

CNT electron sources were thought to have their largest potential market in flat-panel field-emission displays (FEDs) [320,321], In 2011 the flat-panel display market had an estimated net worth in excess of 135 billion—one of the largest global markets in human history. Figure 5.26(g) illustrates a simple CNT-based display pixel, where the CNTs are vertically deposited on a matrix of electrodes in a vacuum housing. 

The vacuum fluorescence (VF) tube is a modification of the CRT in which the rastered electron beam is replaced by a hot cathode addressable for each pixel. It has proved to be the most useful of the flat CRTs, a bright, rugged, inexpensive display preferred for automobile applications. The cold-cathode version of the VF display is called t it field emission display (FED). Prototype models have been recently shown at Display Works 98. The glass used in these flat displays is similar to that used in conventional CRTs (Table 7.2). 

---