Double-faced fluorescent display tube and method of manufacturing the same

摘要

A double-faced fluorescent display tube is provided which is capable of reducing the insulation failure and breaking of wiring patterns and capable of improving a luminous efficiency by reducing an ineffective current of an anode. An envelope 1 comprises a back substrate 2 and a front substrate 3 facing each other and a frame-like side plate sealed between the substrates 2 and 3. A wiring pattern 13 is formed on the inner surface of the front substrate 3. A transparent anode conductor 14 is connected to the wiring pattern 13. A phosphor layer 15 is formed on the anode conductor 14. A control electrode 17 is disposed at a predetermined distance away from the phosphor layer 15. An exposed portion of the wiring pattern 13 on the front substrate 3 is covered with a transparent and insulating SiO2 film 19.