JPS6341736Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a discharge display board, and more particularly to a gas discharge display board that displays characters, numbers, etc. by discharging ionized gas.

Such gas discharge display panels have various characteristics depending on the shape of the opposing electrodes or the structure of the cells formed between the opposing electrodes.
It is broadly classified into so-called X-Y dot matrix display or segment display. The present invention is particularly effective for the former X-Y dot matrix display, and relates to the structure of a spacer (hereinafter referred to as a channel) that defines the display area and prevents erroneous display between adjacent discharge cells. It is.

Conventional gas discharge display panels have stannic oxide electrodes, commonly known as NESA electrodes, formed on a front substrate in parallel with each other, and a display area is defined on the NESA electrodes to be orthogonal to the NESA electrodes. A first dielectric group is formed by a printing method, while silver or nickel electrodes are formed parallel to each other on the rear substrate, and a display area is defined on the electrode group so as to be orthogonal to the electrodes. A second dielectric group is formed by a printing method, the front substrate and the rear substrate are opposed to each other so that the transparent Nesa electrode and the silver or nickel electrode are perpendicular to each other, and the first dielectric group is hermetically sealed. and the second dielectric group define an XY dot matrix display area. At this time, the first dielectric group and the second dielectric group also define the discharge gap of the dot matrix cell. In such a conventional discharge display panel, the first channel is formed perpendicular to the NESA electrode on the front substrate, and the second channel is formed perpendicular to the electrode on the rear substrate. This is to prevent erroneous display between adjacent cells, and it has been found that, for example, if channels are formed parallel to each electrode, erroneous display between adjacent cells is likely to occur.

Although the first channel and the second channel can be easily formed by screen printing, there are problems as described below. That is, (a) when assembling the front substrate and the rear substrate facing each other, the second channel on the rear substrate faces the gap between the NESA electrodes on the front substrate, and the second channel on the rear substrate faces the gap between the electrodes on the rear substrate. It is necessary to perform alignment so that the first channels on the front substrate face each other. That is, alignment in both the X and Y directions needs to be performed accurately, but there is a predetermined gap between the front substrate and the rear substrate, which causes parallax. Also, when the front and rear substrates are fired and sealed with sealing glass after assembly, the front and rear substrates are difficult to align with the second channel. There is a problem that misalignment may result in misalignment.

(b) Normally, the channels are colored black in consideration of the contrast between the cell and the background during discharge, but the first channel formed on the front glass plate and the second channel formed on the rear glass plate In particular, if MgO is deposited on the front electrode and rear electrode to lower the discharge starting voltage, etc., the second channel may be different from the display surface due to the high whiteness of MgO. When viewed from the side, this results in a significant decrease in contrast, which deteriorates the display quality of the discharge display panel.

The purpose of the present invention is to provide an improved channel configuration to solve the above two problems.

According to the present invention, similar to the conventional discharge display panel, on the transparent NESA electrodes formed on the front substrate, the NESA electrodes are arranged perpendicularly to the NESA electrodes and correspond to the gaps between the electrodes formed on the rear substrate. After printing a first channel group by a screen printing method and drying it, a second channel group conventionally formed on the rear substrate is printed so as to correspond to each gap between the NESA electrodes, and is then dried. The first channel group is printed by screen printing so as to be perpendicular to the first channel group, and then fired. The paste used when printing the second group of channels is, for example, PbO with Al ₂ O ₃
The desired channel shape can only be obtained by appropriately selecting the viscosity of the paste and the specifications of the screen used, as detailed later. It became.

By combining a front substrate on which a transparent NESA electrode, a first channel group, and a second channel group are formed, and a rear substrate on which a silver or nickel electrode group is formed in the same manner as in the past, and hermetically sealing them. , a discharge display panel according to the present invention can be obtained. In the discharge display panel according to the present invention, the alignment of the transparent NESA electrode and the second channel group on the same substrate is done by printing, so the front substrate of the conventional discharge display panel is This is much easier than the alignment of the Nesa electrodes and the second channel group on the rear substrate. In the discharge display panel according to the present invention, when assembling the front substrate and the rear substrate, the first channel group on the front substrate and the electrode group on the rear substrate are aligned, and therefore aligned in one direction. Moreover, since neither the first channel group on the front substrate nor the electrode group on the rear substrate transmits light, alignment can be easily performed by transmitting light from the rear substrate side. I can do it. In addition, since the positional deviation that occurs when the front substrate and the rear substrate are baked and sealed is only a problem in one direction, the number of positional deviation defects has been drastically reduced compared to the conventional method. Furthermore, by forming the first channel and the second channel that define the discharge cells on the front substrate side, the contrast of the display surface is improved to about twice that of the conventional one, allowing extremely clear display. I was able to get it.

The present invention will be explained in detail below using the drawings. FIG. 1 shows a cross section of a conventional discharge display panel, where 1 is a front glass plate and 2 is a rear glass plate. Reference numeral 3 designates a plurality of NESA electrodes formed on the front glass plate, and a plurality of them are formed in parallel to each other. A plurality of silver or nickel electrodes 4 are formed on the rear substrate 2 by screen printing and are arranged perpendicularly to the NESA electrodes 3. Normal electrode 4
The thickness of the electrode is approximately 10μm, and the thickness of the Nesa electrode is 6000μm.
Formed around ~10,000 Å. 5 is a first channel formed on the transparent NESA electrode 3 by a screen printing method, and this first channel 5 is as follows:
It is formed perpendicularly to the transparent NESA electrode 3. A second channel 6 is formed on the electrode 4 by a screen printing method, and the second channel 6 is formed perpendicular to the electrode 4. The front glass plate 1 on which the Nesa electrode 3 and the first channel 5 are formed, and the rear glass plate 2 on which the electrode 4 and the second channel 6 are formed, have the first channel 5 in the gap between each of the electrodes 4. corresponds to, and
The second channels 6 are aligned so as to correspond to the gaps between the respective electrodes of the Nesa electrodes 3, and are hermetically sealed. The first channel 5 and the second channel 6 define a discharge cell of the XY dot matrix type and also define a discharge gap of the discharge cell. The first channel 5 and the second channel 6 are formed to have the same thickness to prevent erroneous display between adjacent cells, and the thickness is set to 50 μm in consideration of the printability of the channels. . The thinner the channel thickness is, the better the printability is, but in order to obtain appropriate firing voltage and brightness, a minimum channel thickness is specified, and according to experimental values, the minimum channel thickness is 35 μm.

FIG. 2 is a sectional view of an embodiment according to the present invention,
Similar to the conventional discharge display panel, a transparent NESA electrode 3 is formed on the front glass plate 1, and then a first channel 5 is formed with a thickness of 50 μm perpendicular to the NESA electrode 3 by screen printing. Form. Further, on the rear glass plate 2, a silver or nickel electrode 4 is formed, similarly to the conventional discharge display panel.

In the discharge display board according to the present invention, the second channel 6, which was conventionally formed on the electrode 4, is superimposed on the first channel 5 and formed by screen printing so as to be perpendicular to the first channel 5. However, unlike the conventional method of forming channels on electrodes with a thickness of at most 10 μm, it is now possible to form channels on a surface with unevenness of 50 μm so that the thickness is uniform regardless of location. It becomes necessary. This pattern will be explained using FIG. 3. In Figure 3,
3 is a transparent NESA electrode, 5 is a first channel, and 6 is a second channel formed perpendicular to the first channel 5.

Since the second channel 6 is printed across the first channel 5 with a thickness d ₁ of 50 μm, the thickness of the second channel is thinner on the first channel 5 as shown. (d ₂ +d ₃ ), and the portion without the first channel 5 tends to be thick (d ₁ +d ₂ ). The difference in thickness d ₃
If d3 becomes large, erroneous display between adjacent cells in the direction of the electrode 4 is likely to occur, so the value of _d3 must be made as small as possible. In addition, the second channel 6 in the part where the first channel 5 is not present
This causes sagging during printing, which makes the shape of the discharge cells non-uniform. In order to solve this problem, the paste used for printing the first channel and the second channel, e.g.
The viscosity of a paste made by adding Al ₂ O ₃ etc. to PbO is adjusted, and the viscosity is 200,000 cps to 500,000 cps.
By using a 200 to 250 mesh stainless steel screen with a resist thickness of 30 to 60 μm, when the first channel thickness d ₁ is approximately 50 μm, the second channel thickness is set to Approximately 100μm on the part, approximately 60μm on the first channel 5
The difference in thickness d ₃ could be set to about 10 μm. Furthermore, it was possible to prevent print sagging on the second channel 6.

In the discharge display board according to the present invention as described above, since the alignment of the Nesa electrode 3 and the second channel 6, which are difficult to align, is done by printing on the same glass plate, it is not necessary to use the conventional method. This is significantly easier than alignment through a discharge gap or an even larger gap. Therefore, when assembling the discharge display panel according to the present invention, it is only necessary to align the first channel 5 and the electrode 4, and this alignment is performed using transmitted light from the rear glass plate 2. It can be easily done. Further, during firing in the hermetic sealing process, it is only necessary to deal with misalignment in one direction, and therefore defects due to misalignment can be significantly reduced. Further, a first channel 5 and a second channel 6 defining discharge cells are connected to the front glass 1.
By forming it on the side, it became possible to improve the contrast of the display surface, and it was possible to obtain an extremely clear display.

Furthermore, it goes without saying that the discharge display panel according to the present invention has the same normal operating voltage range as the conventional discharge display panel.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional discharge display board. FIG. 2 is a sectional view showing an embodiment of the present invention. FIG. 3 is a partially enlarged sectional view for explaining the present invention. 1, 2: Glass plate, 3: Nesa electrode, 4: Silver or nickel electrode, 5, 6: Channel.

Claims (1)

[Scope of utility model registration request] A first substrate having a first electrode group formed parallel to each other and serving as a front substrate; and a second substrate having a second electrode group formed parallel to each other and serving as a rear substrate; The first substrate and the second substrate are opposed to each other so that the first electrode group and the second electrode group are substantially perpendicular to each other, and hermetically sealed to obtain a predetermined discharge gap; In a discharge display board in which a dischargeable gas is sealed, a plurality of electrodes are arranged substantially perpendicularly to the first electrode group and opposite to electrode gaps between the electrodes of the opposing second electrode group. one dielectric group is printed and formed on the first electrode group, and a plurality of second dielectric groups are formed on the first dielectric group at electrode gaps between each of the first electrode groups. 1. A discharge display board, characterized in that the display board is formed by printing so as to be substantially orthogonal to the second electrode group.