JP2771359B2 - Fluorescent display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display panel used for a computer terminal display, an OA terminal display, and the like.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are a perspective view and a main part enlarged view of a conventional fluorescent display panel. A phosphor 8 is patterned on an anode substrate 7, a grid 9 is fixed thereon with a conductive paste 10, and a linear cathode 3 is stretched thereover by electrodes 4 a and 4 b, thereby forming a linear cathode 3. The vibration suppressing wire 6 is fixed so as to contact the linear cathode 3 in a direction intersecting the direction of the stretch. This vibration suppression line is intended to prevent vibration of the linear cathode 3 which causes display disturbance, flickering and the like.

FIG. 3 shows a conventional example in which the vibration suppression line 6 is in contact with the linear cathode 3 but the diameter of the vibration suppression line 6 is smaller than the diameter of the linear cathode 3. It is a part enlarged view.

[0004]

As shown in FIG. 5, the vibration suppressing wire 6 is in contact with the linear cathode 3, or
There was a positional relationship with a gap. In FIG. 5, the linear cathode 3 and the vibration suppression line 6 are in contact. In this state, in order to extract an electron beam, the linear cathode 3 is heated to a high temperature. At this time, since the linear cathode 3 and the vibration suppression line 6 are in contact with each other, heat transfer from the linear cathode 3 to the vibration suppression line 6 is large, and the temperature of the linear cathode 3 becomes lower than the surroundings. The electron emission ability of the linear cathode 3 in the portion was locally reduced, and as a result, the amount of emitted electrons was uneven, and the brightness was uneven in the display.

When the linear cathode 3 is not in contact with the vibration suppressing line 6 (not shown), a potential is generated in the vibration suppressing line 6 and the electric field near the vibration suppressing line 6 is disturbed, so that the linear cathode 3 is disturbed. The electrons emitted from No. 3 were disturbed, and the display was uneven.

As a method for solving these problems, Japanese Patent Application Laid-Open No. Hei 2-100246 and Japanese Utility Model Application Laid-open No. Sho 60-2409 disclose a vibration suppressing line at a small distance from the linear cathode to reduce the temperature of the linear cathode. A method for preventing the drop is shown, and a method for applying a voltage to the vibration suppression line is shown as a means for preventing a potential generated on the vibration suppression line.
However, in the method of applying a voltage to these vibration suppressing lines, it is necessary to prepare an external voltage source and a current limiting resistor separately from the fluorescent display panel, which increases the manufacturing cost of a device incorporating the fluorescent display panel and increases the wiring of the printed circuit board. There were problems such as increased routing restrictions.

[0007]

According to the present invention, a plurality of linear cathodes stretched at intervals, a vibration suppressing line for suppressing vibration of the linear cathode, and an inner surface of the display surface glass are charged. In a fluorescent display panel having a conductive film for prevention, the linear cathode has electrical contact means with the antistatic conductive film at both ends, and the electrical connection between the antistatic conductive film and the vibration suppressing line immediately above the vibration suppressing line. It has a characteristic contact means. A metal piece can be used as the electrical contact means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. 1 and 2 are a sectional view and an enlarged view of a main part of an embodiment of the present invention. Display surface glass 1 using soda glass, etc.
A conductive film 2 having a high resistance for antistatic is formed inside. A metal piece 5 having a spring property is led out from the electrodes 4a and 4b supporting the linear cathode 3, and is connected to the conductive film 2 formed on the display surface glass 1. Further, the linear cathode 3
The metal piece 5 is connected to the conductive film 2 from the electrode 4c supporting the vibration suppressing line 6 for suppressing the vibration of the conductive film 2.

As a result, as shown in FIG. 2, even when the vibration suppressing wire 6 and the linear cathode 3 are separated from each other, the metal pieces 5 are connected to the conductive film 2 formed on the display surface glass 1 with high resistance. Therefore, the vibration suppression line 6 having the metal piece 5
It is always kept at the same potential as the potential of the linear cathode immediately below the vibration suppression line. Therefore, even if the linear cathode 3 is heated to a high temperature, the linear cathode 3 and the vibration suppression line 6 are not in contact with each other, so that the temperature does not decrease due to conduction. Further, since the vibration suppression line 6 has the same potential as the potential of the linear cathode immediately below the vibration suppression line 6, there is no disturbance of the electric field. As a result, no luminance unevenness occurs in the display. In addition, since the potential of the vibration suppressing line 6 is set by the metal piece 5, a power source for determining the potential of the vibration suppressing line 6 outside the fluorescent display panel is unnecessary, and the vibration suppressing line 6 and the linear cathode 3 are not required. Since there is no potential difference even when the electrodes contact each other due to vibration, no current flows between the vibration suppression line 6 and the linear cathode 3, and a resistor for limiting current is not required.

[0010]

As described above, according to the present invention, it is not necessary to prepare an external voltage source and a current limiting resistor separately from the fluorescent display panel, and the electric field is disturbed by the vibration suppressing line for suppressing the vibration of the linear cathode. And a fluorescent display panel having a uniform luminance can be obtained. As a result, there is no need to prepare an external voltage source or current limiting resistor separately from the fluorescent display panel,
Problems such as an increase in manufacturing cost of a device incorporating the fluorescent display panel and an increase in restrictions on wiring of a printed circuit board can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment shown in FIG.

FIG. 3 is an enlarged view of a main part showing a conventional example.

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is an enlarged view of a main part of the conventional example shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display surface glass 2 Conductive film 3 Linear cathode 4a, 4b, 4c Electrode 5 Metal piece 6 Vibration suppression line 7 Anode substrate 8 Phosphor 9 Grid 10 Conductive paste

Claims (2)

(57) [Claims] A plurality of linear cathodes stretched at intervals, a vibration suppressing line for suppressing vibration of the linear cathode, and a conductive film for preventing static electricity on an inner surface of the display surface glass. A fluorescent display panel having electrical contact means with the antistatic conductive film at both ends of the linear cathode and having electrical contact means with the antistatic film and the vibration suppressing line immediately above the vibration suppressing line. Fluorescent display panel. 2. The fluorescent display panel according to claim 1, wherein said electrical contact means uses a metal piece.