JPH0433634Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention relates to a flat display panel in which display is performed by exciting phosphors that form picture elements using electrons extracted from a plasma discharge space. be.

(b) Conventional technology A conventional example of this type of flat display panel is the magazine "Nikkei Electronics February 28, 1983.
One example is the one introduced in the article ``14-inch plasma flat display with CRT-like performance'' on pages 171 to 178 of the Japanese issue.

FIG. 2, which is an exploded perspective view of this conventional example, will be described below. This flat display panel is
A row electrode 4 formed of a cathode plate 1 and a plurality of strip electrodes 3, 3...3 arranged in parallel across a discharge space 2 forming a plasma generation chamber with respect to the cathode plate.
and vertical and horizontal apertures 5, 5, corresponding to each picture element.
A control plate 6 is composed of an insulating flat plate made of alumina or the like having . Aperture groups 8, 8, which extend in a direction perpendicular to the row electrodes 3 forming the row electrodes 4 and respectively correspond to picture elements.
8...8, a column electrode 10 consisting of a plurality of strip electrodes 9, 9...9, an accelerating electrode 11 deposited on the inner surface, and a face plate 7 having a fluorescent film 12 coated thereon. Ru. 13 is a glass container.

With this configuration, for example, -200V is applied to cathode plate 1,
When +60V is applied to the row electrode 4, DC plasma is generated in the discharge space. Furthermore, a voltage of 50 V, for example, according to the signal of the picture element is applied to the column electrode 10.
When a DC voltage of 4 KV is applied to the accelerating electrode 11, the electron beam extracted from the DC plasma in the discharge space excites the phosphor film forming each picture element, causing it to emit light.

As introduced in the above article, flat display panels are said to be able to outperform CRTs in principle, but various problems arise especially when they are made larger. One of them is the column electrode 1.
0 and the acceleration electrode 11 provided on the panel glass 7 cannot be maintained uniformly with high precision, resulting in variations in brightness. In the conventional example described above, in order to maintain this distance l uniformly, the glass spacers 14 are arranged at appropriate positions. If a glass spacer is used, row and column electrodes cannot be arranged, resulting in display picture elements being missing.
For this reason, in addition to the drawback that the display becomes extremely unnatural, especially on analog screens (screens other than text and characters), the manufacturing process requires a glass spacer and a welding process, resulting in high costs. Not only are they forced to become
Over time, the distance between each point in the space between the panel glass supported by a glass spacer and the column electrodes becomes uneven due to deflection of both, causing uneven brightness and, in some cases, localized discharge. It is forced to suffer from the disadvantage of causing

(c) Problems to be solved by the present invention The present invention attempts to improve the various drawbacks of the conventional example described above. The object of the present invention is to provide a low-cost flat display panel that does not cause any problems.

(d) Measures to solve the problem: Provide a recess on the inner surface of the panel glass that includes at least a space equivalent to each pixel, and have a uniform depth from the surface to the bottom. An accelerating electrode is provided, and a fluorescent film is uniformly buried thereon.

(E) Function The distance between the accelerating electrode and the column electrode is determined by the depth of the recess in the panel glass and the dimensional accuracy of the accelerating electrode. Furthermore, by bringing the inner surface of the panel glass into close contact with the column electrodes, the distance between both the acceleration and column electrodes can be maintained uniform without using glass spacers or the like. Therefore, all the drawbacks associated with the use of glass spacers are eliminated.

(f) Embodiment The details of the present invention will be explained below with reference to FIG. 1 showing an exploded perspective view of an embodiment of the flat display panel of the present invention. Reference numeral 21 denotes a cathode plate, which normally receives -200V DC. applied. Reference numeral 22 denotes a control plate formed of an alumina plate or a glass plate, and on its plane, there are aperture groups a11, a12, . . . , a1n, .
It has amm regularly. On the surface of the control plate 22 on the cathode plate side, there are striped electrodes 23, 23...2 connecting apertures aligned in the horizontal direction of the screen.
3 is formed by metal vapor deposition. Each row electrode together constitutes a row electrode 24. The distance between the row electrode 24 and the cathode plate 21 is maintained at approximately 20 mm, forming a gas discharge space. Further, on the other surface of the control plate 22, that is, the surface on the face plate 25 side, there are striped electrodes 23, 23...2 constituting the row electrodes 24.
Strip electrodes 26, 26, . . . , 26 are formed by metal vapor deposition or the like, extending in a direction perpendicular to 3, connecting apertures lined up in the vertical direction of the screen, and arranged in parallel. These individual strip electrodes together form the column electrode 2.
7.

Each strip electrode 23, 23...23 of the row electrode 24
It goes without saying that each aperture on the intersection of the respective strip electrodes 26, 26, .

The inner surface of the panel glass constituting the face plate 25 is finished with a highly accurate mirror surface. On this mirror surface, a width of a fixed pitch p (for example 0.2 mm) is
0.1 mm vertically extending grooves 28, 28...
28 are provided. This groove ranges from 0.1mm to 1.0mm depending on the performance required for flat display panels.
Must be provided uniformly to a depth of mm. If the groove is shallow, techniques such as photo etching will suffice, but if the groove is 1 mm, it will need to be cut with a diamond cutter or the like. It is desirable that the bottom surface of each groove be as flat as possible. On the bottom surface of each groove, a transparent metal such as Nesa film or indium antimony is deposited to a thickness of about 3000 to 4000 mm to form accelerating electrodes 29 . . . 29 . Said groove 2
8, 28...28 are connected to a common orthogonal groove 30, and an electrode 31 provided in this orthogonal groove functions as a power supply terminal to the accelerating electrode.

A phosphor 34 of a predetermined color is coated on the accelerating electrode to form a set of phosphor stripes of three primary colors in every three grooves. For example, the width of every third partition wall that partitions the grooves is set to 32, and the surface 33 of the partition wall is
It is also possible to form a carbon film on the surface to improve contrast, etc. With this configuration, when a DC voltage corresponding to a signal of -200V is applied to the cathode plate 21, +60V to the row electrode 24, and +10 to +50V to the column electrode 27, electrons in the DC plasma generated in the discharge space are applied. is the control plate 22 and the matrix electrode 2
An aperture at the intersection of 4 and 27 [e.g.
An electron beam passing through a'1n, a1n and a''1n is extracted and excites the phosphor film forming the picture element corresponding to the aperture, causing it to emit light.

In place of the above-mentioned grooves 28, a configuration may be adopted in which holes of a fixed depth are bored at positions corresponding to each picture element of the face plate 25. In this case, the accelerating electrode extends from the bottom of each hole to the inner wall surface. The electrodes are constructed so that the electrodes reach the surface and are successively connected to the next hole, but in order to ensure insulation between the row electrodes and the acceleration electrodes, an insulating film is interposed near the row electrodes and the acceleration electrodes.

(g) Effects According to the present invention, there is no missing part of the electrode due to the interposition of a glass spacer as in the conventional example, so it is possible to enjoy the effect that a natural screen can be reproduced even for analog images. In addition, the complicated process of intervening welding of glass spacers can be omitted, resulting in cost reduction. Furthermore, since there are no parts that bend over time, the reliability can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of a flat display panel of the present invention, and FIG. 2 is an exploded perspective view of essential parts of a conventional example. 21... Cathode plate, 24... Row electrode, 22... Control plate, 27... Column electrode, 25... Face plate, 28... Groove, 29... Accelerating electrode, 3
4... Fluorescent film.

Claims (1)

[Scope of utility model registration request] a cathode plate, each row electrode having an aperture group corresponding to a picture element; A control plate is composed of an insulating flat plate having vertical and horizontal apertures corresponding to each picture element, and the row electrodes are arranged close to each other on the cathode plate side of the control plate. A column electrode consisting of a plurality of strip electrodes extending in a direction perpendicular to the electrodes and having aperture groups each corresponding to a picture element, and a glass panel disposed close to the column electrode and having a phosphor on the inner surface. In the flat display panel, a recess (generally referred to as groove or hole) is provided on the inner surface of the glass panel, including a space equivalent to at least each picture element, and having a uniform depth from the surface to the bottom; A flat display panel characterized in that an accelerating electrode is provided at the bottom of each recess, and a fluorescent film is uniformly buried thereon.