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A new structure of under-gate carbon nanotube (CNT) field emission display (FED)panel is proposed in this paper with normally-on driving scheme. In this structure, the gate electrode is still located beneath the cathode with the cathode and focus electrode arranged alternately. The effect of the under-gate is to prevent the field emission when the negative voltage is applied on the gate electrode...
Fabrication and testing process is as follows: firstly, Ag electrode is printed on the silicon substrate with a screen-printing method, 4 hours should be taken for barking at 550 °C. In the second step, cold cathode emitter should be prepared by the combination of carbon nanotubes (CNTs) and ZnO's slurry at a certain proportion. With the same screen-printing method, we print the composite emitter...
In this paper, the authors report a simple method can control the CNTs distribution. The emission properties of screen-printed CNTs were improved after using with a wetting and dispersing additive simultaneously. Moreover, the screening effect of the agglomerated CNTs emitters are also numerically studied.
Carbon nanotubes (CNTs) have excellent performance in field emission [1-3]; they can be used as field emission (FE) cold cathodes. The traditional FE cold cathode is difficult to apply to the microwave electronic devices. In this paper, we used thermal chemical vapor deposition to synthesize CNTs directly on the surface of traditional thermal-cathode by self-heated. The result proved that the field...
In this paper, we use graphene as conductive layer to improve the field emission properties of CNTs. The metallic nature of graphene and its low contact resistance with metal electrode give a small voltage drop both along the graphene and at the graphene/metal interface. This means that the supply of electrons from the electrode to the emitters is sufficient.
A local heating chemical vapor deposition method is used to synthesize carbon nanotubes onto a metal substrate. Compared with normal thermal chemical vapor deposition, this method can provide faster growth rate, more nodes can be formed onto the carbon nanotubes, and emission sites can be increased largely. A maximum current over 100 mA was obtained from carbon nanotubes emitter layer with emission...
In this research report, the authors have a close view on this process. The authors treat the dc-biased carbon nanotube as an RF antenna and the pulsed laser beam as the plane wave. Based on traditional microwave antenna theory and nonlinear optics, the authors are going to describe the electric field distribution around the vertically-standing single-walled carbon nanotube irradiated by pulsed ultrafast...
Evaporation of carbon nanotubes (CNT) cathodes and the degradation of its field emission are reported in this paper. After 100 h at 1323 K the emission current density decreases from 6.50 to 0.20 mA/cm2 at 7.50 V/mum field strength, while the turn-on field increases from 1.92 to 2.45 V/mum at a current density of 0.1 muA/cm2. The C+-ion current in a mass spectrometer has also been measured to compare...
In this paper, we have studied the contact effect on the field emission properties of ZnO nanostructure printed on various substrates to understand emission performance more exactly. Here we demonstrated the field emission properties from the tetrapodlike ZnO nanostructure screen printed on Ag, carbon nano fiber (CNF)/Ag substrate respectively. The ZnO nanostructure is produced by chemical vapor deposition...
An efficient method is used to improve the emission stability and uniformity of the field emission from a carbon nanotube (CNT) cathode. In this method, a fully sealed device with CNTs cathode is exhausted by a pumping system. At the same time, this device is baking at a temperature about 400degC and maintains for a few minutes, and an overload current is applied. The overload current can burn the...
This paper proposed a new way to optimize the cathode pattern, which improves the emission performance easily and efficiently. The edge effect was firstly analyzed by numerical simulation and verified by light spot measurement experiments. Then several emission current density profiles along the surface of cathode with different cathode patterns were presented. Both qualitative and quantitative comparisons...
Carbon nanotubes (CNTs) have attracted great interest in the scientific field because of their unique structure, remarkable properties and potential applications. CNTs have been synthesized by methods such as arc discharge, chemical vapor deposition, laser ablation, etc. Such sustained, high-current field emission is necessary for many technological applications: for example, flat-panel field-emission...
Traditional powder metallurgical method is used to fabricate the cold field emission cathodes. Copper powder and nano-copper oxide powder are mixed with carbon nanotubes, respectively, then pressed and sintered to form two kinds of bulk cathodes. The measurement results show that cathodes fabricated by this method have typical I-V curve and F-N curve
A novel driving method for FED, named as sub-pulse width predictor-corrector, is proposed in this paper. With this method, we actualized 256 grades grayscale image display with VGA resolution at 50 Hz frame frequency in a CNT-FED (carbon nanotube FED)
Field emission display inherits excellent display qualities of traditional CRT and is a prospective flat display panel. Traditional normal gate FED consists of front and rare glass substrates, using spacer matrix for maintain fixed gap. Compared with diode structure, the modulation voltage is lower in triode structure because of the shorter gap between gate and cathode. However, in a normal gate triode,...
A carbon nanotube field emission display (CNT-FED) composed of a cathode, a gate electrode and an anode is fabricated. The device is analyzed by IR spectra. The gate electrode was fabricated using corrosion reaction. The luminance of the triode structure FED is measured
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