Patent ID: 6932664
Filing Date: 2005-08-23
Classification: H01J

Abstract:
1. A method comprising: injecting a coating solution at a predetermined amount from one opening of a tube having an opening in each of both ends thereof, said coating solution containing an organic metal compound that turns into an inorganic metal compound having an electron emission ability by a burning process; forming a coating film on the entire inner wall of the tube by causing the coating solution to go along the inner wall of the tube while entirely sealing the opening of the tube; burning the coating film to form an electron emission film on the entire inner wall of the tube; providing a plurality of light-emitting portions in the tube; providing at least two discharge electrodes on an outside of the tube for applying voltages to the light emitting portions, and locally solidifying the coating film formed in the vicinity of a tailing end of the coating solution going along the inner wall of the tube, wherein the local solidification of the coating film comprises the tube thereby being a gas discharge tube having an electron emission film formed on the entire inner wall of the tube for improving discharge characteristics.