JP2823892B2 - Color discharge display panel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color discharge display panel coated with a phosphor that emits light when excited by ultraviolet light, and more particularly to a color discharge display panel in which the shape of the display discharge cell is devised. It is.

(Summary of the Invention) The present invention relates to a color discharge display panel, which forms a display cell whose cross section is surrounded by a step-shaped tapered barrier having an arbitrary inclination angle, and forms a fluorescent screen on the entire inner surface of the barrier. The fluorescent screen emits light by the excitation of ultraviolet light due to gas discharge to display an image.

Thus, this panel structure facilitates the production of a discharge display panel having excellent luminance and luminous efficiency.

(Prior Art) Conventional structures of a CD (direct current) type color discharge display panel are roughly classified into two types, and exploded perspective views of those panel structures are shown in FIGS. 6 and 7. FIG. The panels shown in FIGS. 6 and 7 are hereinafter referred to as a plane configuration panel and a tapered cell sheet panel, respectively.

In the sixth illustrated planar configuration panel, 1 is a display anode, 2
Is an auxiliary anode, 3 is a cathode, 4 is a phosphor screen, 6 is a display discharge cell, 7 is an auxiliary discharge cell, 9 is a front plate, and 10 is a back plate.

The panel shown in FIG. 6 has a structure in which the above-described components are formed by printing or photolithography on two substrates, a front plate 9 and a back plate 10, and both are superimposed, and a display discharge cell and an auxiliary discharge are formed on the same surface. There are cells.

Light emission in the panel shown in FIG. 6 is performed as follows. The display discharge cell 6 internally generates a display discharge to generate ultraviolet rays while receiving charged particles and the like from the seed discharge in the auxiliary discharge cell 7. Visible light is obtained from the fluorescent screen 4 excited by the ultraviolet light. In this case, the phosphor screen is a so-called transmission phosphor screen on which the observer views the phosphor screen emission through the phosphor screen. In order to increase luminance and luminous efficiency, it is necessary to increase the area of the phosphor screen. Therefore, it is preferable that the cross section of the barrier has a narrow width and a vertical wall surface.

In the structure of the discharge cell, in order to improve the luminance and luminous efficiency of the panel, it is considered to be advantageous to use a method in which the inner wall of the cell is tapered and used as a reflective phosphor screen, and the tapered cell having the display cell shown in FIG. Seat panels have also been produced with relatively good results.

In FIG. 7, 1 is a display electrode, 3 is a cathode, 4 is a phosphor screen, 6 is a display discharge cell, 9 is a front plate, 10 is a back plate, and 11 is an intermediate cell sheet.

In the panel shown in Fig. 7, a display cell is formed by making a tapered hole by etching, machining, or the like on a sheet made of an insulator having a thickness of 1 mm or less, and applying the phosphor so that the phosphor is poured into the inner wall of the cell. Thus, an intermediate cell sheet 11 is formed, and the intermediate cell sheet 11 is sandwiched between the front plate 9 and the back plate 10 on which electrodes are formed by thick-film printing, and is overlapped.

(Problems to be Solved by the Invention) In order to develop a large color display using a discharge display panel, in addition to improving characteristics such as luminous efficiency and luminance, a cell configuration having a large area and easy microfabrication must be adopted. No. The problems of the conventional color discharge display panels will be described below with respect to the configuration examples of the panels.

The flat panel structure shown in FIG. 6 has a large cathode area, so that a stable discharge can be obtained even if there is some error in the formation accuracy of the electrodes and discharge cells. A mold has been produced. However, since only about 60% of the visible light obtained by ultraviolet excitation can be extracted to the outside due to the transmission type phosphor screen, the luminance,
There is a disadvantage that luminous efficiency is low.

On the other hand, the tapered cell sheet panel shown in FIG. 7 is advantageous in terms of luminance and luminous efficiency because of the reflective phosphor screen, but has the following manufacturing problems.

That is, the cell sheet shown in FIG. 7 has a thickness of 1 mm or less,
Since a large number of tapered holes are formed, it is very difficult to obtain the necessary strength as a substrate when manufacturing a large-sized panel and to handle it in a manufacturing process. In terms of the dimensional accuracy of the components, the width of the cathode is small in the tapered cell shown in FIG. 7, and when the pitch accuracy of the anode and the tapered hole is not sufficient, the position of the anode 1 is shifted to the cathode 3 in the assembled discharge cell. On the other hand, it will be located to the left or right. This misalignment of the electrodes greatly affects the discharge characteristics, making it impossible to obtain a uniform discharge over the entire panel. For this reason, the dimensions of the parts are required to be extremely high precision, and actual production becomes difficult. The problems with these tapered cell sheet panels become more important as the panels become larger and the discharge cell pitch becomes finer.

As described above, sufficient luminance and luminous efficiency cannot be obtained with the display cell structure of the conventional panel, or even if sufficient luminance and luminous efficiency can be obtained, the structure is complicated, large, and high definition. There was a big problem that conversion was difficult.

As described above, in the structure of the conventional color discharge display panel, elements for increasing luminance and luminous efficiency are not compatible with elements for increasing the size. In addition, it is a factor that hinders fabrication with fine pixels.

Therefore, an object of the present invention is to eliminate the above-mentioned problems, adopt a tapered discharge cell in the panel configuration, and improve the brightness,
It is an object of the present invention to provide a large-sized color discharge display panel capable of improving the luminous efficiency and eliminating a problem in manufacturing such as misalignment between electrodes.

(Means for Solving the Problems) In order to achieve this object, a color discharge display panel according to the present invention includes a pair of parallel electrode groups on a rear substrate and a barrier having a stepped tapered cross section. At least one set of rectangular small holes, a phosphor screen applied to the inner wall of each of the rectangular small holes, and another set of parallel electrodes orthogonal to the set of parallel electrodes. Wherein said barrier is an insulating laminate comprising at least two stages of thick films, and said set of rectangular small holes is provided at the intersection of said one set of parallel electrodes and said another set of parallel electrodes. Each of the rectangular small holes is located, and the shape of the bottom of the rectangular small hole on the rear substrate is formed to be larger in the electrode direction on the rear substrate than in the direction perpendicular to the electrode, and in the electrode direction on the rear substrate. The inclination angle of a staircase taper is It is characterized in that it is formed steeper than the inclination angle of the stepped taper.

(Example) In a normal panel as shown in FIG. 6, an insulating paste is laminated and printed using a single screen mask.
A barrier can be formed at a predetermined height. At this time, if the viscosity of the paste is adjusted, the width of the pattern in the laminated upper layer becomes smaller than that in the lower layer, resulting in a shape with a weak taper of 10 degrees or less. The present invention focuses on this point, and obtains a fluorescent screen similar to a tapered shape by using this weak taper angle in printing a single mask.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an exploded perspective view of a basic structure of a discharge cell according to the color discharge display panel of the present invention, and FIG. 2 shows a plan view (a), a front view (b), and a side view (c) of the basic structure.

In both figures, 1 is an anode, 3 is a cathode, 12 and 13 are barriers having a step-shaped tapered cross-sectional shape, and 4 is a phosphor screen. Barrier 12
Has increased the inclination angle 14a in order to increase the area of the phosphor screen. On the other hand, the barrier 13 has a small inclination angle 14b to prevent misalignment of the anode and the cathode. In the display discharge cell shown in FIG. 1, it is possible to obtain a high luminance by forming a fluorescent screen on the entire inner surfaces of the barriers 12 and 13 and making the reflective fluorescent screen having a large area into a pseudo tapered shape.

FIG. 8 is an example of a conceptual drawing of the production of a display discharge cell portion in the discharge display panel of the present invention. 10 is the back plate, 5a, 5b, 5c
Are thick-film printing layers with different dimensions of the missing pattern. By setting the thickness of each of the layers 5a, 5b, and 5c and the size of the cutout pattern of each layer, a taper cell having an arbitrary inclination angle can be obtained. As described above, in the discharge cell to which the present invention is applied, since a plurality of layers of thick film printing having different escape patterns are stacked, the cross-sectional shape is basically a stair-like pseudo-tapered shape. Further, in the present invention, a reflective phosphor screen having a shape close to a linear taper can be formed by a combination of a weakly tapered barrier of about 10 degrees or less and a relatively thick phosphor when formed by one type of screen printing mask. That is, in order to effectively extract visible light from the reflective phosphor screen, its film thickness must be at least 20 to 40 μm. If such a relatively thick phosphor screen is formed on the inner surface of the step-shaped barrier with a weak taper between each step, the phosphor easily accumulates in the recess of the barrier, so that regardless of the formation method, the surface is It becomes closer to a linear taper shape. In a specific prototype test, 300 μm wide, 500 μm long, 200 μm high
A good pseudo-tapered shape could be formed by performing thick-film printing on m cells using three to four types of patterns. Note that the phosphor screen can be formed using printing, photolithography, or the like.

Next, the effect of the present invention on misalignment between electrodes will be described. In the present invention, the inclination angle 14b of the barrier of the cell shown in FIG. 2 is made small to make the cathode horizontally flat. For this reason, even when the anode is eccentric due to a shift in the total pitch, the center-to-center distance between the anode and the cathode is hard to change, so that a stable discharge can be obtained, and the allowable range for component accuracy can be set large.

3 and 4 are exploded perspective views (FIG. 3) and plan views (FIG. 3) of the basic structure of a display discharge cell in which the influence of misalignment between electrodes is further minimized compared to the cells of FIGS. FIG. 4 (a)), a front view (FIG. 4 (b)), and a side view (FIG. 4 (c)).

The barrier surface 12 is a slope similar to that of FIG. 1, but the barrier surface 13 is a vertical surface without inclination, which is particularly effective in the manufacture of a very large panel in which the alignment between electrodes is emphasized.

In the above description, the case where the phosphor screen is formed only on the barrier surface has been described. In addition, when the transmission phosphor screen is also formed on the display discharge cell portion of the front panel, the same process is performed, although the process becomes complicated. effective.

As described above, when a large-sized panel is prototyped by the conventional technology, it is extremely difficult to secure the component accuracy required for forming the taper cell. However, in the display discharge cell of the present invention, the allowable range of component accuracy is increased. Therefore, a display discharge cell having the same function as the taper cell can be realized.

In FIGS. 1 to 4, the barrier is a straight line, but is not limited thereto. For example, a barrier having a display cell portion with a beard in the horizontal direction, a barrier having a transparent electrode with an enlarged anode area, and the like. It is clear that also has the same effect.

FIG. 5 shows an example of application of the present invention to a flat panel.
Unlike the panel shown in FIG. 6, a reflective phosphor screen is formed on the entire inner wall of the display discharge cell, the light emitting area is increased, and the alignment of the anode and the cathode is misaligned in the cell shape shown in FIG. We are taking measures. By using the panel shown in FIG. 5, it is possible to manufacture a large-sized panel with high luminance and high luminous efficiency, which eliminates a problem in manufacturing.

It is also possible to apply to priming slits other than those shown in FIG. Further, application to a panel having no auxiliary cell is also possible.

In the above description, the case where there is a weak taper between each step has been mainly described. However, a similar effect can be obtained although the effect is weakened even if a complete step-shaped taper is formed without forming a weak taper.

Although the example of the formation and application of this step-shaped tapered cell has been described by thick film printing, it can also be formed by photolithography. This is the same in that a step-type taper cell having an arbitrary inclination angle is obtained by stacking barriers in a process that is repeated using a plurality of photomasks.

In the above description, the DC discharge display panel has been described, but the present invention applies to all color discharge panels.

(Effects of the Invention) When a cell is formed according to the present invention, a phosphor screen similar to a linear taper can be formed by appropriately setting the mask through-hole size and the thickness of each layer, although it has a stepped taper with a small number of masks. The obtained discharge cell shape can be easily obtained.
The following problems are improved by the present invention.

In the conventional tapered cell formation, it was difficult to apply to a large size only by a method using a cell sheet, but the present invention can be formed by lamination on a substrate, so that handling is easy even in a large size, and High accuracy can be maintained.

In forming a discharge display cell having a tapered cross section, it is possible to minimize obstacles caused by misalignment between electrodes orthogonal to each other, which is effective in increasing the size of the panel.

Phosphor screens can be formed on both the side and bottom surfaces of the wall of the discharge cell, and the area of the phosphor screen can be maximized to obtain higher accuracy than conventional discharge cells.

Since the discharge cell barrier has a stepped shape, it has an advantage of helping the phosphor solution to adhere to the barrier at the time of forming the phosphor screen, and the phosphor can be easily applied.

When a barrier is formed by a printing method, the number of steps is increased, but the practicality is high because the conventional process can be applied with almost no change. When photolithography is applied,
Finer discharge cells can be formed than in thick film printing, and the display resolution can be increased.

[Brief description of the drawings]

1 and 2 show an exploded perspective view and a structural view of a discharge cell according to the present invention, and FIGS. 3 and 4 show an exploded perspective view and a structural view of another embodiment of the discharge cell according to the present invention. FIG. 5 is an exploded perspective view of a planar configuration panel to which the present invention is applied. FIGS. 6 and 7 are exploded perspective views of a conventional planar configuration panel and a tapered cell sheet panel, respectively. The figure shows an example of a manufacturing process of a discharge cell to which the present invention is applied. DESCRIPTION OF SYMBOLS 1 ... Display anode 2 ... Auxiliary anode 3 ... Cathode 4 ... Phosphor screen (phosphor) 5 ... Barrier 6 ... Display discharge cell 7 ... Auxiliary discharge cell 8 ... Priming slit 9 ... Front panel, 10 Back panel 11 Intermediate cell sheet, 12 Stepped barrier 13 Stepped barriers 14a, 14b with different slopes

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takao Kuriyama 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside Japan Broadcasting Corporation Broadcasting Research Institute (72) Inventor Akio Ishikawa 1-110-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Broadcasting Research Institute (72) Inventor Hiroshi Murakami 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Broadcasting Research Institute (56) References JP-A-60-250541 (JP, A) 62-249334 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 11/00-17/64 H01J 9/02

Claims (2)

(57) [Claims] 1. A set of parallel electrodes on a rear substrate and one barrier surrounded by a barrier having a stepped tapered cross section.
A set of rectangular small holes, a fluorescent screen applied to the inner wall of each of the rectangular small holes, and at least another set of parallel electrodes orthogonal to the set of parallel electrodes;
The barrier is an insulating laminate made of at least two steps of thick films, and one of the set of rectangular small holes is provided at an intersection of the set of parallel electrodes and the other set of parallel electrodes. The rectangular small holes are located respectively, and the shape of the bottom of the rectangular small hole on the rear substrate is formed larger in the electrode direction on the rear substrate than in the direction perpendicular to it, and the staircase is located in the electrode direction on the rear substrate. A color discharge display panel characterized in that the inclination angle of the taper is formed to be steeper than the inclination angle of the step-shaped taper perpendicular to the taper angle. 2. A color discharge display panel according to claim 1, wherein said insulating layer comprising said thick film is a layer printing of an insulating paste comprising screen printing.