Practical CNT‐FED structure for high‐luminance character displays

— A high-luminance CNT-FED character display using a simple line rib structure was constructed. The display panel had 48 × 480 dots and the subpixel pitch was 1 mm. The greatest benefit of a display using CNT technology is high luminance performance with low-power consumption. The luminance of the green-color dot wasca. 10,000 cd/m2 under 1/1 6 duty-cycle driving at a 6-kV anode voltage. The high luminance of the display panel can provide good visibility when installed even in outdoor locations, and the power consumption was ca. 4 W at the character displaying module. This, a CNT-FED for character displays also has potential multifunctionality, which could be battery driven. It should be useful for public displays even under emergency no-power conditions. In this work, a practical structure and process technologies for making ribs with reasonable cost were developed. The newly introduced 2-mm-tall line ribs as spacers were formed by using innovative production processes; i.e., the rib paste was pushed out of a multi-slit nozzle, and the rib shape was formed by UV-light irradiation. The developed panel structure and manufacturing processes also had the advantages of size flexibility and high production yield.