JPH02186532A - Gas discharge display apparatus - Google Patents

Abstract

PURPOSE:To lower cathode sputtering by forming a layer of a phosphor which emits light with longer afterglow than cathode operating pulse frequency and shorter wavelength than the work index of a cathode material in the inside walls of a cathode space. CONSTITUTION:A cathode lead 2, a resistor 3, a nickel-based cathode 4 are formed on an insulating substrate 1 and a Ba film 4' is formed on them and the resistor 3 are connected to the cathode 4 and the Ba film 4' in series. Laminated glass thin plates are used as a spacer 8, an auxiliary anode 5 is installed in one end of an auxiliary discharge space, a display phosphor 9 is applied to the walls in a display discharge space 7 to carry out luminescent display by irradiation of ultraviolet ray generated by electric discharge, and a display anode is installed in the inside surface in a transparent plate 11. A phosphor layer 13 for a cathode which emits light with longer aftergrow than a cathode operation pulse and shorter wavelength than the work index of the cathode material is installed in the walls of the cathode space 6. Electrons are thus easily emitted from the cathodes 4', 4 by external photoelectric effect and discharge can be started by low application voltage and as a result, cathode sputtering is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas discharge display device, and particularly to a large-screen, thin gas discharge display device used in wall-mounted televisions and the like.

[Conventional technology]

Regarding discharge cells of gas discharge display panel structure, Japanese Patent Application Laid-open No. 60-1.01594 and Japanese Patent Application Laid-open No. 63
This is described in No.-62133.

FIG. 3 is a cross-sectional view showing the schematic structure of the conventional discharge cell disclosed in these publications, which includes an insulating substrate], a cathode lead 2,
A resistor 3, a cathode 4 connected in series with the resistor 3, an auxiliary anode 5, an auxiliary discharge space 6, a display discharge space 7, a spacer 8 for forming the discharge space, a display phosphor 9, a display anode 1
0 and a translucent face plate 11, etc., and the discharge space 6.7 is filled with one or 2ff of rare gases such as Xe, Ar, He, Ne, Kr, etc. It is used in mixed packaging.

A brief explanation of the operation of the above cell is as follows. That is, first, a first negative discharge is generated in the auxiliary discharge space 6 between the cathode 4 and the auxiliary anode 5, and then, by applying a negative pulse to the auxiliary anode 5, the discharge is displayed as the cathode 4. The ultraviolet rays generated by the discharge stimulate the display phosphor 9 to emit light. Panel display is performed by arranging such cells in a 71-helical pattern and causing the necessary cells to emit light.

[Problem to be solved by the invention]

However, the discharge cell of the conventional structure described in (-) requires a high driving voltage (300 to 350 V), which causes sputtering of the cathode material and shortens the life of the cell, and the cost of the driving circuit is high. There were some problems, such as:

The purpose of the present invention is to solve the problems of discharge cells with conventional structures, and to solve the problems of discharge cells with a conventional structure. An object of the present invention is to provide a discharge display device.

[Means to solve the problem]

The purpose of the second part is to provide a layer on the inner wall surface of the cathode space of the discharge cell made of a phosphor that emits light with a longer afterglow than the cathode drive pulse period and a wavelength shorter than the work function of the cathode material. This can be achieved by using a gas discharge display device that uses a cell structure. [Operation] As described above, a gas discharge display device generates electricity by applying a pulse voltage between the electrodes and causing a discharge intermittently. Operate.

The phosphor layer provided in the two-part cathode space is excited by the ultraviolet light generated by the discharge and emits light, but since the afterglow is longer than the driving pulse period, the applied voltage drops by -degrees and the discharge stops. The applied voltage is increased to start the next discharge again.
- Continues to emit light until it rises. Since this emitted light is incident on the cathode surface and its wavelength is shorter than the work function of the cathode material, electrons are easily emitted from the cathode due to the external photoelectric effect, making it possible to start the discharge with a lower applied voltage. Therefore, it becomes possible to drive the device at a lower voltage.

〔Example〕

EXAMPLES Hereinafter, the gas discharge display device of the present invention will be specifically explained using examples.

FIG. 1 is a sectional view showing a schematic structure of a discharge cell of a gas discharge display device according to the present invention. In the figure, reference numeral 1 denotes an insulating substrate made of soda glass, ceramic, or the like, on which a cathode layer 2, a resistor 3, and a nickel cathode 4 were formed by a thick film printing method or the like.

Ba(N,
) 2 was thermally decomposed to form a Ba film 4'. Further, the resistor 3 is connected in series with the cathode 4 and the Ba film 4' to perform a memory operation.

Reference numeral 8 denotes a spacer for forming a discharge space, which is made of laminated chemically etched thin glass sheets. 6 is an auxiliary discharge space, and an auxiliary anode is provided at one end thereof. Reference numeral 7 denotes a display discharge space, the wall of which is coated with a display phosphor 9, which emits light when stimulated by ultraviolet rays generated by the discharge to display a display.

11 is a translucent face plate made of soda glass, and a display@pole 10 is provided on its inner surface. Here, the above-mentioned auxiliary anode 5 and display anode 10 were formed by printing and baking nickel paste. In addition, a cathode phosphor 51.3 that emits light with a longer afterglow than the cathode drive pulse and a shorter wavelength than the work function of the cathode material is placed on the wall surface of the cathode space.
has been established. Moreover, Xc gas was sealed in the discharge space.

For the discharge cell with the above configuration, with display anode] 0 at ground potential and auxiliary anode 5 at +100V potential, Ba cathode 4' is applied with a period of 8 ms, pulse @ 8 μs, voltage -300 V.
When a pulse voltage of is applied, the auxiliary anode 5 and the Ba cathode 4'
A discharge (auxiliary discharge) occurs between the two, and the cathode phosphor 13 emits light due to the ultraviolet rays generated by the discharge. Since this light emission lasts for 8 ms or more, the next discharge is more likely to occur due to the external photoelectric effect caused by this light emission, and the discharge is performed stably. In addition, when a display discharge is to be caused, when the above-mentioned discharge is occurring, if a pulse with a pulse width of 2 μs and a voltage of −200 μs is applied to the auxiliary anode 5 in a superimposed manner, the discharge will occur between the display anode 10 and the Ba cathode 4′. During this period, a discharge occurs in the display discharge space, and this discharge causes the display phosphor 9 to emit light, which is observed from the outside as a display. Note that when the exhibition is carried out only in the auxiliary discharge space, the discharge space is of a bent structure as shown in the figure, so that the discharge is not directly observed from the outside.

Figure 2 is a diagram showing a comparison of discharge characteristics (relationship between the minimum value of applied pulse voltage necessary for stable discharge and the pulse period) between a discharge cell configured according to the present invention and a discharge cell configured conventionally. 1
j and evening curve I4, the latter being shown by curve 15. From this result, it can be seen that in the case of the discharge cell having the structure of the present invention, the discharge voltage is lower than that of the discharge cell having the conventional structure. Moreover, this also reduces cathode sputtering, reduces deterioration of characteristics, and makes it possible to extend the lifespan.

〔Effect of the invention〕

As mentioned above, in a gas discharge display device,
The discharge cell has the structure of the present invention, that is, the inner wall of the cathode space has an afterglow longer than the cathode drive pulse period.
In addition, by providing a discharge cell with a phosphor layer that emits light with a shorter wavelength than the work function of the cathode material,
By solving the problems of the conventional technology, the driving voltage is low, so there is less cathode sputtering, and the life is long.
It was possible to provide a gas discharge display device that can be operated with a lower cost drive circuit.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a schematic configuration of a discharge cell of a gas discharge display device according to the present invention, FIG. 2 is a diagram showing a comparison of discharge characteristics between a discharge cell having a configuration according to the present invention and a discharge cell having a conventional configuration, and FIG. 1 is a cross-sectional view showing a schematic configuration of a conventional discharge cell. 1 - Insulating substrate 2... Cathode lead 3... Resistor 4 Cathode (Nj) 4'-Ba cathode
5 Auxiliary anode 6... Auxiliary discharge space 7... Display discharge space 8...
・Spacer 9 Display phosphor 10 Display anode 11 Transparent face plate 12 Cathode space
13 Phosphor for cathode 14・Characteristics of the discharge cell configured according to the present invention】5・Characteristics of the discharge cell configured conventionally Attorney Patent Attorney Junnosuke Nakamura (Δ) Matters Specialist M

Claims (1)

[Claims] 1. A matrix-type gas discharge display device having a discharge space provided between a light-transmitting face plate and an insulating substrate, and provided with electrodes for causing display discharge to occur in the discharge space. , the inner wall of the cathode space has an afterglow longer than the cathode driving pulse period, and
A gas discharge display device comprising a phosphor layer that emits light with a wavelength shorter than the work function of a cathode material. 2. The gas discharge display device according to claim 1, wherein the discharge is a discharge induced by an auxiliary discharge.