JPS6343799Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light-shielding part that is arranged in a gas discharge display device, particularly in front of a display pattern, for the purpose of obtaining contrast in discharge display.

Examples of gas discharge display devices include external electrode type discharge display devices. An example of this external electrode type discharge display device is shown in FIG. In the display device shown in FIG. 1, a plurality of front electrodes 3 and back electrodes 4 are arranged on a pair of insulating plates 1 and 2 made of transparent glass plates. 6, and the dielectric films 5 and 6 are further coated with discharge-resistant materials 7 and 8.
At the same time, these insulator plates 1 and 2 are faced with spacers 9 and 10 in between to form a discharge space 12 having a desired display pattern, and the outer periphery is hermetically sealed with an enclosure seal 11, It is filled with an inert gas, and a desired pattern is displayed by emitting light by applying an alternating current voltage between opposing electrodes 3 and 4 to cause gas discharge.

Such discharge display devices generally use a transmission filter with a transmittance of about 50% disposed on the display surface to improve the contrast of the display. Although this method of using a transmission filter is effective in improving contrast, it has the disadvantage of reducing the luminance of the luminescent display. Therefore, in order to obtain the desired luminance luminance, the amount of attenuation due to the transmission filter must be taken into account. It is necessary to display the discharge. Therefore, in addition to the disadvantage that the power consumption of the display device increases, there is also the disadvantage that the cost of the drive circuit, that is, the cost of the device, becomes relatively high.

This invention solves the drawbacks of the above transmission filter,
This is improved by forming a lattice-shaped insulating light-shielding film on the inner wall of the insulating plate 1.

An embodiment of this invention will be described below with reference to FIGS. 2a and 2b. Figure a shows a cross-sectional view of the display device according to the present invention, and figure b shows the state seen from the display surface side.

In these figures, the insulating plates 1 and 2 are transparent glass plates, the front electrode 3 is a SnO ₂ ;Sb transparent electrode, the back electrode 4 is a silver electrode that was silk-printed using Ag paste and then fired, a dielectric film 5, 6 is a film thickness of 5 μm obtained by silk printing a low melting point lead glass paste and then firing it.
m low melting point lead glass film, light shielding film 13 according to the present invention
is a black dielectric film with a thickness of 20 μm using a low melting point lead glass paste having a black coloring agent on the dielectric film 5, the discharge-resistant materials 7 and 8 are discharge-resistant material films with a thickness of 5 μm, and the spacers 9 and 10 are A paste made mainly of Al ₂ O ₃ powder and low melting point glass powder was silk-printed and then fired to form an insulating layer with a thickness of 50 μm and an encapsulating seal 1.
1 was composed of a layer formed with a thickness of 150 μm on an insulating plate 1 using a paste made from fritted glass powder. The insulating plates 1 and 2 constructed in this way are placed facing each other and fired to melt the enclosed seal and create an airtight seal, which emits 300% neon gas.
It was sealed with a gas pressure of mmHg.

In the display device according to the present invention, as shown in FIG. 2B, a grid-shaped light-shielding film 13 covers both the front surface of the discharge space 12, which is a light-emitting display portion, and the front surface of the spacer 9, which is a non-light-emitting portion. For this reason, the entire surface of the display device becomes black, and the contrast of the display is improved.
Furthermore, since the light-shielding portion has a grid shape, the luminance of the light-emitting display does not decrease.

The light-shielding film of the present invention can be patterned in various shapes other than the shape shown in FIG. 2b,
It goes without saying that a desired contrast can be arbitrarily selected depending on the size of the area of this light-shielding pattern.

The discharge display device according to the present invention described above can reduce the power consumption to obtain the desired brightness compared to the conventional discharge display device, and does not require an external filter, so the cost of the device can be reduced. We were able to reduce this.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an external electrode type gas discharge display device. FIG. 2a is a sectional view of the display device according to the present invention, and FIG. 2b is a partial plan view showing the state seen from the display surface side. 1, 2... Insulating plate, 3... Front electrode, 4... Back electrode, 5, 6... Dielectric film, 7, 8... Discharge resistant material, 9, 10... Spacer, 11... Encapsulating seal , 12...discharge space, 13...light shielding film of the present invention.

Claims (1)

[Scope of utility model registration request] A front surface of the insulating substrate in a gas discharge display device in which a discharge space is formed by making insulating substrates having discharge electrodes face each other with a spacer interposed therebetween, and a discharge space is filled with discharge gas, and the discharge gas is discharged to emit light to display a display. A discharge display device characterized in that a lattice-shaped light shielding film is formed on an inner surface of a side insulating substrate so as to face both the discharge space and the spacer.