SU440722A1 - The method of manufacturing a plasma panel - Google Patents

Description

one

The present invention relates to computing, in particular, to the manufacture of plasma display panels used to visualize information from digital computers in automated control systems.

A known method for stabilizing the cell characteristics of a plasma panel is to connect an additional volume to the cells and simultaneously fill the cells and an additional volume with a working gas mixture.

The method of filling cells is determined by the type of design of the plasma panel. Three types of construction are currently known.

The first type is a three-layer structure consisting of three parallel glass plates. The middle plate is made in the form of a matrix with a large number of holes. On the outer plates, transparent conductive electrodes are preliminarily placed on the outer side, and in one of them a hole is made, to which the pingee is soldered. The electrodes are arranged in such a way that each cell of the panel is located at the intersection of two mutually perpendicular electrodes. With the aid of the pinch, the panel is fed to the vacuum system. The panel is then evacuated, degassable, gas filled and sealed. Additional gas volume is located in the pingels.

The second type is a two-layer structure consisting of only two extreme glass plates, which are spaced apart from each other by a predetermined distance by means of a gasket made, for example, in the form of a frame. The plates along the edges are sealed, and then, in a similar way, the working mixture of gases is filled through the pingels. The shtengel here serves to store an additional volume of gas.

The third type is a structure made of gas-filled tubes (capillaries). A longitudinal electrode is applied to the seized tube. The tubes are mounted on a dielectric plate with electrodes. Moreover, the electrodes on the tubes and the electrodes on the plate are mutually perpendicular. The cells of the panel are integrated in the tubes and are located at the intersection of the electrodes on the plate and on the tubes.

To fill glass tubes filled with one end (capillaries of any small diameter) with a gas mixture, they are placed in a wider glass tube with an open end to the vacuum system (the other ends are pre-filled), brewing to the vacuum system, pumping out, degassing filling the gas mixture and taping the tube with capillaries so that, simultaneously with the taping of the tube, the open ends of the capillaries are sealed, and the tube is then cut, and then each tapillary is alternately taped off.

Since capillaries in high resolution panels must have a diameter of 1 mm or less, and they are located adjacent to a dielectric plate, this practically eliminates their soldering to an additional volume. In addition, the existing method of filling them introduces certain restrictions on the use of an additional volume of gas. Consequently, design and technological limitations do not allow the use of additional gas volume in plasma panels on capillary tubes.

Regardless of the type of construction mentioned, the plasma panel, when filled with a working gas mixture, has certain ignition and ignition voltages. The difference between the ignition and quenching voltages is the memory voltage. During operation, the ignition, quench, and memory panels change. These changes are due to the fact that some components of the working mixture of gases that are in the ionized state actively interact with the cell walls, and as a result of the interaction, they are partially absorbed by the walls and react with the glass components. The greatest instability is observed when using mixtures containing active gases - H2 - and others. Therefore, until the gas reserves in the panel and additional volume are exhausted, the electrical characteristics of the plasma panel remain constant. In the first two types of plasma panel designs, the additional volume of gas depends on the size of the pingels, which can be designed to ensure the stability of the characteristics over the entire service life. However, due to the large size of the additional volume, the paelp structure becomes cumbersome. In the third type of construction, the introduction of additional volume is practically impossible, therefore, the service life of the panel with the specified parameters is small, much less than the service life of the integrated circuits used to control the panel.

However, this method of manufacture is characterized by the impossibility of obtaining time-stable electrical parameters.

The purpose of the invention is to stabilize the electrical characteristics of the panel.

To do this, after filling the cell, the plasma panel is placed in an alternating electric field for 30-40 hours, after which the ignition and quenching voltages change significantly, and the memory voltage almost disappears. The cells of the plasma panel are then placed in a vacuum, opened in vacuum and refilled with a working gas mixture. The newly filled working gas mixture cells are again placed in an alternating electric field for 1-2 hours, after which the memory voltage first drops to almost zero, and then recovers to a level of 30% of the original. The cell is then placed back into vacuum and refilled with the working mixture. After subsequent filling, the electrical parameters of the cells become stable over time. The

the method allows to obtain cells with stable parameters without additional gas volume.

FIG. 1 shows a block diagram of an apparatus for implementing the inventive method; on

FIG. 2 - graphs of memory voltage variation.

The block diagram contains capillaries 1, place 2 open the capillary, the glass tube 3, the comb 4, the vacuum system 5, the metal weight 6 and the magnet 7.

The cell characteristics of the plasma panel are stabilized, for example, on capillaries, as follows.

Capillaries 1 give the necessary geometric shape and size, and then sealed at one end. After that, they are placed in a wider glass tube 3, also sealed at one end. The closed ends of the capillaries 1 are placed near the sealed end of the tube 3, which is fed to the comb 4 of the vacuum system b. Thereafter, air is pumped out of the tube 3 and the capillaries 1 and the volume is filled with a gas mixture. Otpayku tube 3 with capillaries 1

produced at the location of the open ends of the capillaries. As a result of the desoldering of the tube 3, the open ends of the capillaries 1 are simultaneously sealed. Then they cut the tube 3 near the place of the desoldering, remove it and produce an alternate desoldering of each capillary 1. The gas-filled capillaries thus obtained are placed in an alternating (more than 30 KHz) electric field and that is sufficient for discharge. Gas-filled capillaries 1 are in an alternating electric field for 30-40 hours. During this time, the memory voltage (see Fig. 2, a) decreases to volts, which indicates the interaction of the ionized working mixture with glass. In the electric field, the capillaries 1 in the place of opening the capillary 2 make an incision and put them back into the glass tube 3, which is fed to the comb 4 and pumped out by the vacuum system 5. Using the magnet 7 and the metal weight 6 capillary cover 1.

From the opened capillaries 1, the exhaust gas mixture is first pumped out, and then

fill the volume with fresh working mix. The tube 3 filled with the gas mixture and the capillaries 1 are sealed as described above.

The newly filled capillaries 1 are placed in an alternating electric field on

1-2 hours During this time the voltage

memory changes (see fig. 2.6). Initially, it decreases rapidly, and then is restored to a level of 30% of the original value.

On the second time filled with a gas mixture and kept in an electric field, the capillaries 1 in the place of 2 open the capillary make an incision. The capillaries 1 are placed into the glass tube 3 and fed to the comb 4, and then the air is evacuated by the vacuum system 5, the magnet 7 and the metal weight 6 are opened and the third filling is performed, followed by tapping the tubes 3 and the capillaries 1. When After the third filling of the capillaries 1 into the alternating electric field, the memory voltage (see Fig. 2, c) remains almost unchanged.

Thus, due to the triple refilling of the capillaries with the appropriate electrical training, it is possible to obtain cell panels with stable electrical parameters in the Burden. The described method is applicable both for the cells on the capillaries and for the cells on flat glasses.

Subject invention

A method of manufacturing a plasma panel, which consists in filling the cells of the panel with a working mixture of gases, characterized in that, with the aim of stabilizing the electrical characteristics of the panel, after filling the cell is placed in an alternating electric field for 30-40 hours, then they are opened in a vacuum, refilled the working mixture and placed in an alternating electric field for 1-2 hours, again opened in vacuum and refilled with the working mixture.

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