JPS6238708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas discharge display device, and particularly to a gas discharge display device of a type that combines an external electrode type gas discharge display device and an internal electrode type gas discharge display device.

External electrode type gas discharge display panels, so-called AC type plasma displays, are characterized by a stable discharge starting voltage over a long period of time and a low discharge starting voltage. For this reason, in AC type plasma displays, a film of oxide such as magnesium oxide is formed on the surface of a dielectric film covering the electrodes to achieve this purpose. Although the formation of the oxide film has favorable characteristics, it also has the drawback of reducing brightness, and furthermore, the dielectric film formed on the electrode also has the drawback of reducing brightness.

An object of the present invention is to provide a new type of gas discharge display device that eliminates the above-mentioned drawbacks by combining an AC type plasma display cell and a DC type plasma display cell.

According to the present invention, an electrode group (DC plasma display type electrode group) not covered with a dielectric film and an oxide film is used for the display side electrode group of two opposing electrode groups, and the other electrode group an electrode group (AC plasma display type electrode group) coated with a dielectric film and an oxide film is used, and a discharge cell is formed at a position facing the DC plasma display type electrode group and the AC plasma display type electrode group, A gas discharge display device is obtained in which a DC voltage is applied to the DC plasma display type electrodes, and high frequency voltages having opposite phases are applied to mutually adjacent electrodes of the AC plasma display type electrodes.

Next, the plasma display panel of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a sectional view of a plasma display panel used in the present invention. Referring to FIG. 1, AC type electrodes 2a and 2b are formed on a glass substrate 1 and covered with a dielectric film 4.
and a DC type electrode 3 formed on a glass substrate 1 are arranged to maintain a discharge space, and a dischargeable gas is filled in the discharge space. In this panel, two AC type electrodes 2a, 2b and one DC type electrode 3 form one discharge cell. Therefore, two AC type electrodes 2 in one discharge cell
The distance between a and 2b is narrower than the distance between AC type electrodes of adjacent discharge cells.

FIGS. 2 and 3 show a voltage application method and applied voltage waveforms for explaining the operation of the gas discharge display device of the present invention. In FIG. 2, a high frequency voltage a with an amplitude Vo in FIG. 3 a is applied to the AC type electrode 2a, and a high frequency voltage a with an amplitude Vo in FIG. Voltage is applied, DC
A DC voltage Vo as shown in FIG. 3c is applied to the mold electrode 3.

If the discharge starting voltage of the discharge cell 23a composed of the AC electrode 2a and the DC electrode 3 is Vfa, then the AC
When the condition of Vfa<Vo (1) is satisfied when the electrode 2a reaches the ground potential, the discharge cell 23a discharges. Similarly, the discharge starting voltage of the discharge cell 23b is
If Vfb is satisfied, the discharge cell 23b discharges when the condition of Vfb<Vo (2) is satisfied at the time when the AC electrode 2b reaches the ground potential.

On the other hand, if the discharge starting voltage of the discharge cell 22 formed between the AC electrodes 2a and 2b is Vfab, then if at least the condition Vfab<2Vo (3) is satisfied, then the discharge cell 22
discharges.

When the above conditions (1), (2), and (3) are met, intermittent discharge is repeated in the discharge cells 23a, 23b, and 22, so the brightness becomes twice as bright and the display side Since a dielectric film and an oxide film are not formed on the transparent electrode 3, the overall brightness can be five times or more higher.

Furthermore, although the transparent DC electrode 3 also acts as a cathode, it only serves to absorb the charge accumulated on the AC electrode group, resulting in a long life.
In addition, since the discharge starting voltages Vfa, Vfb, and Vfab all operate with the AC type electrode as a cathode, Vfa, Vfb, and Vfab are determined by the AC type electrode and the secondary ionization coefficient γ of the oxide film formed on the surface. It's decided by then. Therefore, it is possible to obtain a plasma display that is stable over a long period of time and has a low firing voltage, similar to an AC type plasma display panel.

As described above, according to the present invention, since discharge occurs at three locations in one discharge cell, the display brightness is extremely high.

Furthermore, according to the present invention, three
Since discharge occurs at a certain point, the outline of the discharge cell becomes clearly defined, which greatly contributes to the improvement of display quality as well as high-brightness display.

Furthermore, since the present invention forms one discharge cell by discharging at three locations, it is possible to display without significantly affecting the brightness even if the frequency of the high-frequency voltage applied to the AC type electrode is reduced. This also has the effect of suppressing power consumption due to high frequency loss in the drive circuit and improving circuit reliability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a discharge cell used in the present invention;
FIGS. 2 and 3 a to 3 c show a voltage application method and applied voltage waveforms for explaining the operation of the present invention.

Claims (1)

[Claims] 1 A plurality of first electrodes covered with a dielectric and a plurality of second electrodes not covered with a dielectric are arranged facing each other with a certain gap, and a discharge is possible in the gap. a gas discharge display board filled with gas; a high frequency voltage source connected to the first electrode group; and a DC voltage source connected to the second electrode group; High frequency voltages having opposite phases are applied to adjacent electrodes of the second electrode to generate a discharge between the adjacent electrodes of the second electrode, and alternately between the first electrode and the second adjacent electrode. 1. A gas discharge display device comprising: a means for generating a discharge; and a means for generating a discharge.