DD220172A1 - METHOD FOR PRODUCING FLAT GAS-FILLED OR VACUUM DISPLAY FIELDS - Google Patents

Abstract

In order to reduce the effort in the production of flat display fields, as they are mainly used for the presentation of alphanumeric characters and graphic information, the Innenflaechen the two plates without Zwischenbelueftung before closing nor processed, z. B. cleaned or steamed, and then can be closed without expensive manipulators. For this purpose, in a recipient, two plates provided with electrode structures, layers and solder glass rim are stably fixed to one another in a required working distance, under a bias directed against the distance, in a preselectable temperature range, and subjected to all necessary machining processes in this state. After heating, the heat-dependent fixing of the plates to each other is repealed by further heat, the plates are inevitably brought to the desired distance and warped by further heat supply each other.

Description

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Title of the invention

Method for producing gas-filled or vacuum display panels

Field of application of the invention

The invention relates to the production of flat gas-filled or vacuum display panels, as they are mainly used for the representation of alphanumeric characters and graphic information to color television pictures.

Characteristic of the known technical solutions

Flat vacuum or plasma display screens consist in their basic principle of two mutually parallel, provided with corresponding conductive structures and other layers glass plates that define a narrow gap and are vacuum-tight sealed "Their evacuation and optionally their filling with the gas mixture is usually via a pump neck, which is melted off at the end of the process.

This known production method adhere to the following wax parts, which limit the quality and reliability of the display fields as well as a vii-rtanhof + Ί , - «^" -... j.-.-

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counteractable production:

The operations preceding the pump are successively run in different apparatuses, so that intermediate transports and bearings are necessary which increase the technological complexity and adversely alter those which are sensitive to the influence of the atmosphere. -

»The getter must be mounted in the pump neck to remove the waste products generated during activation. Here, however, the getter effect is limited due to the small opening cross-section of the pump nozzle j on the other hand, the really flat construction of the display panel is disturbed by the pump nozzle.

From DE-OS 2253835 a method for the production of flat gas discharge arrangements for display purposes under Portfall of the ventilation pipe for pumping and filling is known, the process steps in per se known Aufauf

Layers of conventional components in the form of glass plates and intermediate spacers with heat-sealable sealing material in the form of bars or strips, such that air and gas can pass through the bands of the components, filling the layered package with an ionizable gas suitable for display purposes under predetermined pressure, heating the gas-filled package to the welding of the sealing material with the glass plates and formation of a gas-tight, filled discharge vessel by means of the spacers predetermined volume. A disadvantage of this solution is that any processing of the inner surfaces of the glass plates in a vacuum oven is excluded before closing.

From DD-PS 132160 a method for the production of ac plasma displays in two-plate order is known, including

The method steps are applying and passivating the electrodes to substrate plates, insulating the electrodes from the gas space, applying a protective layer to the insulating layer, mounting the display of two electrode-provided substrate plates, pump tubes, spacers and sealing frames, sealing the gasket, heating, pulling and Closing the cell, wherein the mounting of the display of two provided with electrodes, insulating and protective layer substrate plates, one of which has a sintered sealing frame, spacer and a hole for the pump tube, in an oven on the already connected to the pumping and filling apparatus Pump tube is then heated to a temperature below the usual temperature for the low melting of the sealing frame and while maintaining the temperature reached briefly vacuum is applied, then characterized aushei sealed display with simultaneous pumping zt, then filled with filling gas and sealed. A disadvantage of this solution is that any processing of the inner surfaces of the substrate plates in a vacuum oven is excluded prior to sealing.

In order to be able to dispense with the Auspumpstutzen in the production of electron tubes, it is known from DE-PS 1032411, for the production of permanent sealing compounds on butt-adjacent components of airtight pistons, which are processed so that they nestle together, whereupon at least the one of these surfaces is coated with a thin layer of a low oxidizable substance intimately adhering to the support and closely contacting it, which has the property of molecular diffusion into the material of the opposite part at a temperature lower than the deformation temperature of these parts, whereupon this layer and the surface of the opposite part is polished to a high degree, expediently to the optical degree, in order to achieve an airtight connection between the juxtaposed parts which are to be joined together

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First, to set vessel parts apart from each other into a closed container, then evacuate that container and subject the vessel parts to a degassing process by heat treatment, cap the vessel by nipping the polished surfaces, and heat the joints to surface diffusion temperature with simultaneous application of pressure , Which is below the melting temperature · The covering of the polished surfaces and the pressure application to be generated by an externally operable handwheel and transferred to the upper vessel part, a bellows to ensure the seal · A disadvantage of this solution is the relatively complex device for manipulation the vessel parts, which particularly difficult the simultaneous closing of several electron tubes.

Object of the invention

Reduction of the effort in the production of flat display fields.

Explanation of the essence of the invention

Uni to reduce the effort in the production of flat display panels, the inner surfaces of the two plates without intermediate ventilation, before closing still processed, z. B. cleaned or steamed, and then can be closed without expensive manipulators.

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Features of the invention

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In a recipient, two plates provided with electrode structures, layers and solder glass edge are stably fixed to each other in a required working distance, under a biasing bias, to a preselectable temperature range. In this

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State, all necessary machining processes are carried out on the plates in a vacuum. After annealing and the possibly required gas filling the temperature-dependent fixing of the plates to each other is repealed by further heat. Due to the bias and a corresponding guide v / ground the plates inevitably brought to the desired distance and finally, preferably by further heat supply to be soldered together.

It is advantageous to use spacers made of a material for temperature-dependent distance fxiation, which softens or melts shortly before reaching the soldering temperature.

Pur some applications, it may be appropriate to use springs for the temperature-dependent distance fixation of a suitable bimetal.

For most applications, it makes sense to use spacers made of soft glass.

embodiment

The drawing used for explanation shows the prepared for final processing and assembly, arranged in a recipient, not shown, plates.

For the production z. As a AG-Plasma-Anzeigeefeides are the glass plates 1; 2, which are provided with the Blektrodenstruk¬ doors 3 and the Glaslotrand 4, before the brazing in the starting position. The lower plate 1 rests on the base 5 and is fixed in position by the metallic spacers 6, whose length is adjustable so that they at the same time a firm stop for

represent the downward movement of the plate 2 and so set the final plate spacing. At the same time

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the upper plate 2 is guided by a plurality of lateral rails 7 with the required positional accuracy for the later function. A weight 8 or a corresponding tensioned spring provide the required .A pressure. In the initial state, the upper glass plate 2 is held by spacers at the predetermined distance, these Abstandsstüeke 9 are made of a material that softens or melts before reaching the soldering temperature, such. Soft glass, so that the upper plate 2 slowly sinks and rests on the spacers 6 in the final state.

But it is also possible, instead of the fusible spacers 9 Bimetallfedera for holding the upper glass plate. 2 to use, which move downwards with increasing temperature and at the lower end of their way into recesses in the spacers 6 or in the guide rails 7 engage, so they do not press the plate 2 when cooling the assembly back up. In addition, the electrode structure 3 of the lower plate can be contacted by a substrate-connected rail and the electrode structure 3 of the upper plate 2 by another movable rail and connected to an external power source, so that before and during the soldering process, a cleaning gas discharge between the two Plates 1 j 2 achieved and maintained.

Cheaper and suitable for many applications, or sufficient, it is to secure the upper plate 2 in a support frame which is connected by a hinge to the base 5 and thus enables a pivotal movement of the plate 2 against the plate 1. The contact pressure is generated by a prestressed spring; this device requires only a temperature-dependent deformable spacer 9 »which in the cold state, the pivoting together of both plates 1; 2 prevented.

Claims (4)

25 8 483 4 invention claim A method for producing flat gas-filled or vacuum display screens, wherein at least one of the surfaces is coated with a substance that allows a permanent, airtight connection of the adjacent components at a temperature that is below the deformation temperature of these parts, the first to be joined together vessel parts Distance from each other are placed in a closed container, this container is then evacuated, the vessel parts are subjected to a degassing process by heat treatment, the vessel parts joined together and the joints with simultaneous application of pressure to a temperature for permanent connection of both components are heated, characterized in that two with electrode structures (3), layers and Glaslot edge (4) provided plates (1, 2) in the closed container to each other in a required working permitting distance, under a directed against the distance Vorspannun g are fixed stably in a preselectable temperature range, be subjected to all necessary processing processes in this state, after heating and the possibly required gas filling by further heat supply, the temperature-dependent fixing of the plates (1; 2) is canceled, the plates (1, 2) are forced to the desired »h δ> 8 3 4 stood, and preferably soldered together by further heat. 2. The method according to item 1, characterized in that the. Temperature-dependent distance fixing spacers (9) a material which softens or melts shortly before reaching the soldering temperature, 3. The method according to item 1 or 2, characterized in that springs are used for a teraperaturabhängigen distance fixation of a suitable bimetal. 4. The method according to item 2, characterized in that for temperature-dependent distance fixing spacers (9) are used made of soft glass. For this 1 page drawing ·