Patent ID: 6734618
Filing Date: 2004-05-11
Classification: H01J

Abstract:
A vacuum fluorescent display comprising:a vacuum tube with a pair of substrates, and a side glass disposed between the two substrates; filaments mounted within the vacuum tube to emit thermal electrons; an insulating layer formed on one of the substrates; a conductive layer formed on the insulating layer with a predetermined pattern; a phosphor layer formed on the conductive layer; and a rib grid formed on the insulating layer having an insulating rib formed on the insulating layer and positioned around the conductive layer and a control electrode formed on the top surface of the insulating rib, wherein when the distance between the top surface of the substrate on which the phosphor layer is formed and the top surface of the insulating rib is indicated by h1 and the distance between the top surface of the substrate on which the phosphor layer is formed and the top surface of the phosphor layer is indicated by h2, it is established that h1&lE;h2.