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Carbon nanotubes (CNTs) have been significantly used for the field emitters for display applications. It is necessary to investigate the process variables affecting the screen printing of carbon nanotubes for the fabrication of good-quality field emitter devices with uniformity. Screen printing techniques have some advantages such as the short processing time and lower processing cost. The carbon nanotube pastes for screen printing are normally composed of organic binders, carbon nanotubes, and some additive materials. In this study, the carbon nanotube emitters for field emission displays were fabricated with different processing variables such as paste viscosity, paste composition, screen mesh, etc. The CNT pastes were printed on Cr-coated/Ag-printed soda-lime glass substrates. As a result, the processing variables were optimized for the good screen printing. From the I-V characteristics, the turn-on field of single-walled nanotubes was lower than that of multi-walled nanotubes. The decrease in the mesh number of screen masks resulted in decreasing the turn-on field and increasing the electron emission current due to the higher density and vertical alignment of printed-CNTs.

The Technology of Flatron CDT has been developed by LG Electronics. While we are developing the FLATRON, in spite of knowing that the flat screen CDT give many merits to PC(Personal Computer) and Workstation users, we find why conventional CDT have spherical and cylindrical face. One reason is that it is much more difficult to make glass in flat rather than spherical or cylindrical shapes. The other is a flat shadow mask expands or domes more severely by electrons than a rounded one. LG FLATRON conquered the difficulties by applying perfectly flat panel and using the flat tensioned mask. Also we can adopt interchange ability process in mask and faceplate. We will show how to accomplish innovational process which are NCE(Near Contact Exposure) and ICM (Interchangeable Mask) for Flatron CDT.

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In this study, a 10"-sized panel with novel tetrode structure was tried to prevent broadening of electrons emitted from CNTs. The structure of the novel tetrode is composed of CNT emitters on a cathode electrode, a gate electrode, an extracting electrode coated on the top of a hopping electron spacer (HES), and an anode. HES contains funnel-shaped holes whose inner surfaces are coated with MgO. Electrons extracted through the gate are collected inside the funnel-shaped holes and hop along the hole surface to the top extracting electrode. The effects of HES on emission characteristics of field emission display (FED) were investigated. An active ozone treatment for the complete removal of residues of organic binders in the emitter devices was applied to the FED panel as a post-treatment