JPH04206126A - Discharge type display device and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a discharge type display device such as a plasma display that utilizes discharge, and a method for manufacturing the same.

[Prior Art 1] At present, many attempts have been made to create multi-color or full-color displays using rare gas discharge, and it has become technically possible.

Figures 9 and 10 are, for example, materials from the Illuminating Engineering Society of Japan (Light-Related Materials and Devices Research Group, MD-90-16).

P, 83-P, 88.1990) and JP-A-62-21
They are an exploded perspective view showing a cell structure of a panel similar to that of a conventional discharge type display device disclosed in Japanese Patent No. 1831, and a sectional view taken along line CC in the same figure. In both figures, the conventional discharge type display device has 1
For example, a back substrate made of a translucent material such as soda glass (
1), a front substrate (2) made of a translucent material such as soda glass, which is disposed facing the rear substrate (1) at a predetermined distance; and the front substrate (2) and the rear substrate (1). ) (hereinafter referred to as ribs) (3 ) is roughly composed of.

On the inner surface of the back substrate (1) facing the front substrate (2), a plurality of cathodes (4) are formed parallel to each other and spaced at equal intervals, and are arranged regularly so as to be orthogonal to these cathodes (4). The above-mentioned cathode (4) A display discharge cell (5) including an intersection with a display anode provided on the front substrate (2) side, which will be described later, is defined, and the vertical ribs (3a) form a display discharge cell (5) that includes an intersection between all the cathodes (4) and a display anode provided on the front substrate (2) side, which will be described later. An auxiliary discharge cell (6) serving as a pilot transfer cell including an intersection with an auxiliary anode provided on the (2) side is defined. Then, the auxiliary discharge cell (6) of the vertical rib (3a) is
) A briming path (3c) is formed on the side outer wall of the auxiliary discharge cell (6) in order to draw the space charge generated by the discharge into the display discharge cell (5). Display discharge cells (5) are arranged on both sides of the auxiliary discharge cell (6) with (3c) in between.

Further, on the inner surface facing the rear substrate (1) of the front substrate (2), which is the display surface of the discharge vessel formed by overlapping the rear substrate (1) and facing the rear substrate (1), a 1 display anode (7) is written. Auxiliary anodes (8) necessary for this are patterned in parallel to each other in a direction orthogonal to the cathode (4), and a phosphor as a light-emitting substance that excites ultraviolet rays and emits light is placed on the opposite surface of the display discharge cell (5). (9) is applied. Note that a discharge gas such as He-Xe or Ne-Xe is inside the display discharge cell (5) and the auxiliary discharge cell (6) of the discharge vessel, which is constructed by overlapping the back substrate (11 and the front substrate (2)). For example, it is sealed at 10 to 600 Torr.

Next, the operation will be explained with reference to the pulse voltage waveform applied to each electrode shown in FIG. In addition, in Figure 9, D
A is a pulse applied to the display anode (7).

K! It Kn++ indicates a pulse sequentially applied to the cathode (4) in the n and n+1 rows. First, by applying a pulse voltage to the cathode (4) and the auxiliary anode (8), the auxiliary discharge moves in parallel along the auxiliary anode (8) in line order of each cathode (4), and the auxiliary anode (8) is After forming a pilot flame by supplying a space charge to the display discharge cell (5) through the briming path (3c), the generated charge is transferred to the display discharge cell (5) to perform display writing. The above auxiliary discharge cell (6
) in the display discharge cell (5) in the same row adjacent to the cathode (4
) and the display anode (7).

As shown in the timing chart of FIG. 6, a scan pulse and a write pulse are applied to draw charges into the display discharge cell (5) and discharge starts. After the write operation is completed 1
1 by applying sustain pulses and display pulses (negative voltage pulses applied in a DC manner) that are repeated at a constant fast cycle to the display anode (7) and cathode (4) in the selected display discharge cell (5). The discharge during the frame period continues, and the generated ultraviolet rays excites the phosphor [9] to emit light, and the operation continues until an erase pulse is applied. This is what is called a memory display. In this way, a specific display discharge cell (5) is selected and displayed.

Note that if there is no write pulse applied to the 1-display anode (7), no display will occur.

[Problem to be Solved by the Invention 1] Since the conventional discharge type display device is configured as described above, when causing discharge in the 9 display discharge cells (5), each cathode ( 4), the pilot flame discharge moves in parallel along the auxiliary anode (8), and the auxiliary anode (8)
Briming bath (3c) for display discharge cells (5) on both sides
It is necessary to supply space charge through the display discharge cell (5), and the auxiliary discharge cell (6) for performing the pilot discharge is separately provided from the display discharge cell (5) at a ratio of 2:1 to the display discharge cell (5). Therefore, the aperture ratio, which is the ratio of the area occupied by the entire screen of the 7 display discharge cells (5), becomes smaller, the average brightness becomes smaller, and the structure for this becomes complicated. There was a point.

This invention was made in order to solve the above-mentioned problems, and it is possible to start a discharge without having an area in the screen that does not contribute to display light emission, such as an auxiliary discharge cell, and it is possible to start a discharge without having an area in the screen that does not contribute to display light emission, such as an auxiliary discharge cell. It is an object of the present invention to provide a discharge type display device that can increase the aperture ratio, has a strawberry structure, and can perform memory display, and a method for manufacturing the same.

[Means for Solving the Problems 1] The discharge type display device according to the first invention is provided with a front substrate and a rear substrate made of a light-transmitting material, which are provided between the two substrates to block outside air, and have a matrix-like structure inside. are formed to define a plurality of discharge cells.

Each discharge cell is provided with a rib formed by sealing a discharge gas therein, a cathode (first electrode) and a display anode (second electrode) are disposed on the inner surface of the rear substrate, and the inner surface of the front substrate is provided with a cathode (first electrode) and a display anode (second electrode). When disposing an auxiliary anode (third electrode) on the top, its main body is provided in a part facing the rib, one branch part is provided in the discharge cell, and the cathode, display anode, and It is equipped with an auxiliary anode. That is, the above-mentioned auxiliary anode (third electrode) has a main body which is orthogonal to the back substrate side electrode and is hidden by a rib, and a main body which is arranged in the discharge cell and is connected to either of the back substrate side electrodes from this main body. It has a comb-shaped structure with branching parts arranged parallel to and facing each other.

Further, the method for manufacturing a discharge type display device according to the second invention includes:
It has the following steps.

(a) A first step in which a first electrode and a second electrode are formed on the back substrate. Second electrode forming step.

(b) A rib forming step of forming ribs on the rear substrate to define discharge cell areas.

(c) A 311-pole forming step of forming a main body on a portion of the front substrate corresponding to the ribs, and forming a third electrode having a branch portion on a portion of the front substrate corresponding to the discharge cells.

(Process of sealing the dl front board and back board.

Further, a method for manufacturing a discharge type display device according to a third invention includes:
This is the manufacturing method according to the second invention, with the addition of an opposing rib forming step of forming opposing ribs on a portion of the front substrate that faces the ribs of the rear substrate.

[Effect] In the discharge type display device according to the first invention.

Since three electrodes, that is, a cathode, a display anode, and an auxiliary anode, are arranged in each discharge cell, there is no need to have an area in the screen that does not contribute to display light emission, such as an auxiliary discharge cell.

In addition, since only the auxiliary anode (third electrode) is provided on the front substrate side, the aperture ratio of the display surface can be increased with a simple structure.

In addition, since the auxiliary anode (third electrode) is constructed in a comb shape consisting of a main body and branch parts, and one body is placed within the ribs that define the discharge cells, the aperture ratio can be further increased. By drawing out the branch portions to a large extent, the area facing the cathode can be increased and the discharge can be stabilized.

The method for manufacturing a discharge type display device according to the second invention is provided in the nineteenth invention.
In the second electrode forming step, a cathode and a display anode are formed on the rear substrate. Further, in the third electrode forming step, the main body of the auxiliary anode is formed at a position where it is hidden by the ribs of the front substrate, and the portions that do not contribute to one display light emission are arranged at overlapping positions.

A method of manufacturing a discharge type display device according to a third aspect of the present invention; since ribs are also formed on the front substrate in the step of forming ribs between two pairs, crosstalk of discharge is further prevented.

[Embodiment 1] Hereinafter, an embodiment of the present invention will be explained based on the drawings. Figs. 1 and 2 are an exploded perspective view and a partial plan sectional view of a discharge type display device according to this embodiment. In addition, FIG. 3 shows Al-A
l cross-sectional view, Figure 4.

It is a sectional view taken along B1-B1 (however, the phosphor (9) is not shown). In these figures, the same parts as those in the conventional example are given the same reference numerals, and the explanation thereof will be omitted. On the inner surface of the back substrate (1) of the discharge type display device according to this embodiment, a plurality of cathodes (4) as first electrodes are patterned parallel to each other and spaced at equal intervals.

Between these cathodes, a display anode (7) as a second electrode is patterned in parallel and at regular intervals to form a pair with the cathode (4) (display anode (7) and cathode (41 are, for example, 50 to 800
A rib (31) is formed as a separating body that is interposed between these electrodes and a front substrate (2), which will be described later, to define a discharge section.

This rib (31) is a mouth-shaped sealing rib (31a).

Inside the sealing rib (31a), a plurality of vertical ribs (31b+) and horizontal ribs (31c) that are orthogonal to each other are formed in a matrix shape, and the vertical ribs [31b]! :
The sealing rib (31a) has the same height from the rear substrate (1) surface, while the horizontal rib (31C) has the same height as the vertical rib (31b).
), and the cathode (4) and display anode (7) are arranged to face an auxiliary electrode on the front substrate (2) side, which will be described later. Then, a display discharge cell (5) is defined at the location where these electrodes are arranged, and this display discharge cell (5) is connected to the adjacent display discharge cell (5 (and the Wi rib [31c) along the writing scanning direction]. The top of the display anode (7) is connected through a briming bus (31d) having a charge transfer function.The patterning of the one display anode (7) is as shown in FIG.

The rear substrate extends beyond the sealing rib (31a) to the front end surface of the display anode (7) to facilitate voltage application.
Insert the rear substrate (1) across the sealing rib (:na) in the opposite direction.
) to facilitate voltage application (not shown).

On the other hand, on the inner surface of the front substrate (2) which is overlapped with the rear substrate (1) in a state facing the rear substrate (1), the cathode (4) and the display anode (7) are arranged in parallel and at equal intervals in a direction orthogonal to each other. A main trunk (8a) is branched perpendicularly from the main trunk (8a) to each display discharge cell (5), and faces the cathode (4) of the rear substrate (1) as shown in the cross-sectional view of FIG. In order to increase the area and stabilize the discharge, the third branch part (8b) is arranged at the opposite position, and has a structure so that all the auxiliary anodes of each discharge cell are kept at the same potential. A comb-shaped auxiliary anode (8) serving as an electrode has been patterned. In addition, the rib [311 ((31)
are ribs f31a), (31b), (31c)
A phosphor (9) as a light-emitting substance is coated on the inner surface except for the portion facing the auxiliary electrode (8) and the auxiliary electrode (8).

Next, a method for driving the discharge type display device having the above configuration will be explained with reference to FIG.

In Fig. 5, the cathode (4) is sequentially connected to the cathode (4) once per frame period.
The erase pulse and the write pulse are applied once each time, and the cathode (4 times) is applied.
), a sustain pulse is continuously applied to the display anode (7) corresponding to the cathode (4) at a time other than when the erase pulse and the write pulse are applied to the cathode (4), and the auxiliary anode (8) is connected to the cathode (4). )
When the cell is selected in accordance with the timing of the write pulse, the selection pulse of the auxiliary anode (8) is turned on, and when the cell is not selected, the selection pulse is turned off.

Next, the operation of this driving method will be explained.

K which is the nth row of the cathode (4). The display caused by continuous discharge during the previous frame period is erased by the erase pulse applied to DA, and the discharge is started again depending on the presence or absence of the write pulse and the selection pulse applied to DA, which is the first auxiliary anode (8).・If discharge is started when the selection pulse is ON, the sustain pulse is applied again to H, of the display anode (7) on the nth row immediately after the write pulse is applied, and the sustain pulse is C/L, for the cathode (4) of the n-th row,
is indicated by the discharge being connected by a bias voltage V n of .

Therefore, according to the above embodiment, the cathode (4) and the display anode (
7) Since the auxiliary anode (8) exists in the same display discharge cell (5) to enable display, the structure can be simplified without requiring the conventional auxiliary discharge cell, and the aperture ratio of one display discharge cell can be increased. be able to.

Next, a method for manufacturing this discharge type display device will be explained.

A discharge type display device has a pair of front substrate (2) and rear substrate (1).
), and the rear substrate (1) is first formed with conductors such as Ni on the rear glass plate (1a) as a cathode (4) and a display anode (7) by thick film printing or vapor deposition. Next, ribs (31) for preventing discharge crosstalk and providing stable display discharge are formed by laminating the ribs (31) using a low melting point glass paste to a required height by a thick film printing method.

When forming the aforementioned ribs (31), a lateral rib (3) having a briming bus (31d) is provided for the movement of charged particles necessary for display discharge.
1c), that is, print 1 to 5 layers of vertical ribs (31b) to create a height difference between horizontal ribs (31c) and vertical ribs (31b), and then heat the back substrate (1) at 500 to 600°C. After firing, the back substrate (1) is completed.

Next, a conductor such as N1 is formed as an auxiliary anode (8) on the front glass plate (2a) by thick film printing or vapor deposition, similar to the aforementioned rear substrate (lj).
The main trunk (8a) of 8) is formed in a portion corresponding to the contraction rib [31b], and the one branch portion (8b) is formed in the display cell portion.

After that, if necessary, phosphor (1) is formed on the display cell portion by thick film printing or photo etching method.
The front substrate (2) is completed by firing at 00 to 600°C.

Finally, after aligning and overlapping the aforementioned front substrate (2) and rear substrate fl), one periphery is sealed with a glass paste having a lower melting point than the glass paste used to form the ribs (31). The discharge type display device is completed by filling the device with one type or a mixture of two or more types of gas necessary for discharge.

Now, since the discharge type display device according to the first invention uses the manufacturing method as described above, if there is local variation in the height of the ribs (31) formed on the rear substrate (1), the portion There was a problem that a gap was created between the front glass plate (2a) and crosstalk of discharge. In particular, the vertical rib (
31b) is in contact with the front glass plate (2a), where the main body (8a) of the auxiliary anode (8) is arranged with a predetermined thickness, making it more difficult to completely separate it from the adjacent discharge cell. There was a problem.

Other embodiments described below were made to solve the above-mentioned problems, and are intended to prevent discharge crosstalk, and also to provide a manufacturing method suitable for this device. .

Other embodiments will be described with reference to FIGS. 6, 7, and 8. FIG. 6 is an exploded perspective view of another embodiment,
This corresponds to FIG. 1 of the previous embodiment. Further, although FIG. 2 used in the explanation of the previous embodiment can be similarly used in other embodiments, it is not shown again because it is the same. Figures 7 and 8 are A2 shown in Figure 6, respectively.
-A2 sectional view and B2-B2 sectional view. (However, the phosphor (9) is not shown). The reference numerals in each figure indicate the same or equivalent parts as in the previous example, and only the differences will be explained here. (32) is a facing rib arranged on the inner surface of the front substrate (2), and is a corner wall formed in a portion of the rear substrate (1) facing the rib (31). next.

A method of manufacturing a discharge type display device according to this example will be explained.

As mentioned above, the discharge type display device has a pair of front substrates (2).
and a rear substrate (1).The rear substrate [1] is first coated with a conductor such as Ni on the rear glass plate (1a) by thick film printing or vapor deposition to form a cathode (4) and a display anode (7). , After forming, vertical ribs (31bl) and horizontal ribs (31c) with a height of 80 to 300 μm are printed using low melting point glass paste to prevent discharge crosstalk and to perform stable auxiliary discharge and display discharge. After that, in order to provide a briming bath (31 dl) for the movement of charged particles necessary for stable auxiliary discharge, vertical ribs (31b) are formed by thick film printing.
The layers are stacked 00 μm high. In this way, the back board (1
) is fired with a trowel at 500 to 600°C, and the back substrate (1
) is completed.

Next, for the front substrate (2), first a conductor such as N1 was formed on the front glass plate (2a) i as an auxiliary 1'3% & (8) by thick film printing or vapor deposition in the same way as the back substrate (2) described above. After, the aforementioned vertical rib (31b) and horizontal rib (31c)
Corresponding ribs (32) that will become amorphous partition walls are formed by thick film printing using an amorphous glass paste having a lower melting point than the glass frit used to form the glass frit. At that time, the opposing ribs (3
2) is formed to cover the main trunk (8a) of the auxiliary pigeon pole (8). At this point, the main trunk (8a) is securely covered by the opposing ribs (32). and 500-6
The front substrate (1) is completed by firing at 00°C.

Note that the opposing ribs (32) are formed using an amorphous glass paste here.

This is because it has the property of melting more easily when reheated than crystalline materials.

This is because the opposing ribs (32) also easily melt due to heating during sealing between the front and rear substrates, which will be described later.
31b+ and the opposing rib (32) are easily combined.

Finally, after the front substrate (2) and the rear substrate (1) are aligned and overlapped, one periphery is sealed with glass 1<-st, which has a lower melting point than the glass paste used to form the ribs. This is because if glass paste with a high melting point is used, all of the internal ribs f31) and f32) will melt and lose their shape. Also, this heat will cause the opposing ribs (
The tip of 32) melts and joins with the vertical rib f31b).

Then, one type or a mixture of two or more types of gas necessary for discharge is sealed in the device to complete the discharge type display device.

When sealing the aforementioned panels, the opposing ribs (3), which are amorphous partition walls, are
2) is also melted at the same time and comes into close contact with the vertical ribs (31b) provided on the back substrate (1), thereby preventing discharge crosstalk.

In addition, by leaving the branch part (8b) directly involved in the discharge of the auxiliary anode (8) provided on the front substrate (1) and providing the main body (8a) within the corresponding rib (32), the fluorescent part is increased. As the aperture ratio increases, stable auxiliary discharge and display discharge can be realized. In addition, by forming the aforementioned corresponding rib (32) in black, it is possible to prevent light emission from leaking into the adjacent discharge space and to realize a clear display image.

As described above, in this embodiment, in a method for manufacturing a discharge type display device that displays light by emitting light by discharging between electrodes provided on the same or opposing substrate surfaces via a discharge space, the display The vertical direction (column direction) with respect to the horizontal direction (row direction) of the ribs provided on the device to prevent discharge crosstalk.
The partition wall is formed so that the temperature is 20 to 100 μm higher, and an opposing rib is formed at a position facing the aforementioned rib on the opposing substrate using an amorphous glass frit having a lower melting point than the glass frit used to form the rib. A method for manufacturing a discharge type display device characterized by the above-described method has been described.

As described above, the method for manufacturing a discharge type display device according to the third invention is as follows:
In order to prevent the discharge crosstalk described above, opposing ribs (32) are formed on the front substrate using an amorphous glass paste having a lower melting point than the ribs (31).

The rib (32) provided on this front substrate reliably covers the main body (8a) of the auxiliary anode (8).

When the substrate is sealed, it melts together with the glass frit for sealing around the substrate, and comes into close contact with the rib (31) provided on the rear substrate, thereby preventing discharge crosstalk.

In addition, in the above embodiment, the facing rib (32) of the front substrate (2)
), but this is a crystalline glass frit with a melting temperature lower than the remelting temperature of the glass frit used to form the vertical ribs (:atb) and horizontal ribs (31cl) of the back substrate (1). It goes without saying that the same effect can be obtained even if glass frit is used.

Further, in the above embodiment, the cathode (4) was arranged at a position facing the auxiliary anode (8), but the auxiliary anode (8)
), and the cathodes (4) may be arranged next to each other, so that the display anode (7) and the cathode (4) are interchanged.

In addition, in the above embodiment, an example of a color plasma display was shown in which the phosphor (9) layer provided on the front substrate (2) emits light using ultraviolet rays generated by rare gas discharge. A monochromatic plasma display that performs display using visible light directly emitted by gas discharge may also be used.

The same effects as in the above embodiment are achieved.

Further, a horizontal rib [31C] of the rib (31) along the direction of the scanning line parallel to the cathode (4) and the display anode (7)
A briming path T31dl is provided by lowering the height of the vertical rib (31b+), but if the area of this gap is small, the amount of movement of charged particles will be small, making the start of discharge unstable. Ultraviolet rays from discharge light leak into the discharge cells, causing crosstalk and making it impossible to obtain a good display.For this reason, the briming path (31d) has a ratio of 1 to the cross-sectional area of the discharge cells.
It has been confirmed that good results can be obtained within the range of 0 to 60%.

[Effects of the Invention] As explained above, according to the discharge type display device and the manufacturing method thereof according to the first and second inventions, three electrodes, a cathode, a display anode, and an auxiliary anode, are provided in each display discharge cell. By applying a voltage to these electrodes, a discharge can be started and a sustained discharge can be performed to drive a memory, and the aperture ratio of a display discharge cell can be increased with a simple structure.

Further, since the auxiliary anode is configured in a comb shape, and the stem overlaps the rib, the aperture ratio can be further increased.

Further, in the method for manufacturing a discharge type display device according to the third aspect of the invention, since the opposing ribs D\' are formed so as to reliably cover the tree trunk in the opposing rib forming step, crosstalk can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the discharge type display device of the present invention. FIG. 2 is a cross-sectional view of a part of FIG. 1. FIG. 3 is an Al--Al cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along line B1-B1 in FIG. FIG. 5 is a drive waveform diagram. FIG. 6 is an exploded perspective view showing another embodiment of the discharge type display device of the present invention. FIG. 7 is a sectional view taken along line A2-A2 in FIG. 6. FIG. 8 is a sectional view taken along line B2-B2 in FIG. 6. FIG. 9 is an exploded perspective view showing an example of a conventional discharge type display device. FIG. 10 is a sectional view taken along the line CC in FIG. 9. FIG. 11 is a conventional drive waveform diagram. (1) ... Rear substrate (2) ... Front substrate (4) ... Cathode (5) ... Display discharge cell (7) ... Display anode (8) ... Auxiliary anode (8a )...Main trunk (8b)...Branch portion (9)...Phosphor (31)...Rib (31a)...Sealing rib (31b)...Vertical rib (31c) . . . Horizontal rib (31d) . . . Briming path (32) . . . Opposing ribs In each figure, the same reference numerals indicate the same or corresponding parts. that's all

Claims (3)

[Claims] (1) A discharge type display device in which a plurality of discharge cells are arranged having the following elements: (a) a front substrate; (b) a rear substrate; (c) a rib located between the front substrate and the rear substrate and defining a discharge cell area. (d) a first electrode and a second electrode provided on the rear substrate; (e) provided on the front substrate, with the main body provided in a portion corresponding to the rib and the branch portion provided within the discharge cell; the third electrode. (2) A method for manufacturing a discharge type display device having the following steps: (a) a first and second electrode forming step of forming a first electrode and a second electrode on a rear substrate; (b) a discharge cell on a rear substrate; (c) forming a main body in a portion of the front substrate corresponding to the rib and having a branch portion in a portion of the front substrate corresponding to the discharge cell; (d) a step of sealing the front substrate and the back substrate; (3) A method for manufacturing a discharge type display device having the following steps: (a) a first and second electrode forming step of forming a first electrode and a second electrode on a back substrate; (b) a discharge cell on a back substrate; (c) forming a main body in a portion of the front substrate corresponding to the rib and having a branch portion in a portion of the front substrate corresponding to the discharge cell; (d) a facing rib forming step of forming a facing rib in a portion of the front substrate corresponding to the rib; (e) a step of sealing the front substrate and the back substrate.