Patent ID: 8264139

Claim:
A fluorescent display device for use in a vehicle comprising: a housing having a glass substrate; a circuit board adhered to an inner surface of the glass substrate of the housing, the circuit board including a semiconductor substrate, an anode formed of multiple anode conductors, control elements for controlling the anode conductors, and a phosphor layer formed on the anode conductors, wherein the anode and the phosphor layer are formed on the semiconductor substrate; and an electron source formed above the anode in the housing, from which electrons are bombarded to the phosphor layer corresponding to the anode conductors selected by the control elements so that a desired display can be obtained, wherein an aluminum thin film with the aluminum area ratio within a range from 30 to 60% is formed on the inner surface of the glass substrate such that the circuit board can be prevented from peeling off, and the circuit board is fixed to the aluminum thin film via a die-bond material, wherein the aluminum thin film has a peripheral portion which is not covered with the circuit board; an insulating film is formed on the top surface of the aluminum thin film, the insulating film covering the peripheral portion of the aluminum thin film and having an opening through which the circuit board is exposed, and wherein the insulating film is not covered with the circuit board and a portion of the aluminum thin film on the inner surface of the glass substrate is exposed between the circuit board and the insulating film.