DE1132582B - Screen for a color television display tube - Google Patents

Description

GERMAN

PATENT OFFICE

kl. 21 ai 32/54

INTERNATIONAL KL.

H04n; HOIj

C 21329 Vnia / 213 ¹

REGISTRATION DATE: APRIL 29, 1960

NOTICE THE REGISTRATION ANDOUTPUTE EDITORIAL: JULY 5, 1962

The invention relates to a screen for a color television display tube with filter strips covered by a white luminescent material, which alternate allow different basic colors to pass through and are grouped into groups of three, the are separated from each other by gaps, as well as with a continuous conductive layer, of the index pulses can be obtained.

It is known to apply a fluorescent colored screen with lines to the bottom of the tube in the reception tubes used hitherto for color television and to arrange a grid very close to the screen, the wires or threads of which are in a precisely defined position opposite the lines of the screen must be located. The Λ production of these screens and their attachment to the receiver tubes present difficult operations, especially because the wires have a tendency under the effect of temperature changes during installation and during operation of the tube to relax.

Also the application of parallel, made of fluorescent material in three different ways Colors existing ribbons, or the use of a uniform, made of fluorescent material existing, white light-emitting layer known in combination with the colored, made of parallel bands of existing filters is used. Such a tube has a luminous white Luminous covered groups of three of filter strips and a continuous conductive layer.

In contrast, the invention relates to a screen for a color television display tube, which is characterized in that opaque strips are applied to the bottom of the tube, that above the coherent, transparent conductive layer and above this in the Gaps are arranged between the opaque strips groups of filter strips, the Whole of the coherent white luminous phosphor layer is covered.

The transparent conductive layer can advantageously be a very thin metal film which, for. B. by Metallization of the bottom of the tube, on which the network of opaque strips was previously applied under vacuum or by any other suitable chemical, electrochemical, etc. Procedure is applied.

The colored triad as well as the network of opaque stripes can be made out appropriately colored enamel.

Around the areas covered by the triads, like a screen for a color television display tube

Applicant:

Compagnie de Saint-Gobain,
Neuilly-sur-Seine, Seine (France)

Representative: Dipl.-Ing. R. H. Bahr

and Dipl.-Phys. E. Betzier, patent attorneys,

Herne, Freiligrathstr. 19th

Claimed priority:
France of April 30, 1959 (No. 793 639)

Roger Guy, Clamart, Seine (France),
has been named as the inventor

required to electrically isolate, the colored strips that make up the triad must butt against each other.

The above-described arrangement according to the invention has over the conventional Metal grids used have the advantage that there is no electrical connection between the individual Elements of the grid is required.

Below is an embodiment of a receiving screen according to the invention, which under Use of colored enamels made is described.

First of all, using the offset method, by means of a silk umbrella or the like. At appropriate distances from each other the Strips of opaque black enamel applied.

Then these strips of black enamel are placed on the appropriate for their branding Temperature heated. At the end of the enamel baking, the entire surface is applied without the pane being allowed to cool of the glass a reducible conductive solution, e.g. B. a mixture of anhydrous tin chloride sprayed with antimony chloride and formol in ethyl alcohol. After reducing this mixture a uniform, transparent conductive film has formed. Subsequently, this common means in the usual way

209 618/153

Three-color stripes applied, whereby the gaps are left out between these stripes, which correspond to the strips of black enamel.

Further features of the new umbrella can be found in the following description with reference to the drawing showing a section through the screen.

In the drawing, 11 denotes the glass bottom of the actual television tube, on the opaque one Strips 12 are attached at a certain distance from each other. Also immediately on the glass bottom 11 and over the opaque strips 12 is a thin electrical conductive, transparent layer 13 is provided, which form the so-called grid in the areas 13 '. With 14, 15 and 16, the electrically non-conductive strips of the triad are designated, these Triads are also arranged at a distance from each other so that in the areas between the Triads terminate the strips 13 'with the surface of the triad, with areas 13' below the opaque strips 12 lie. About this overall arrangement on the strip 13 'and the ribbons 14, 15 and 16, a fluorescent, white-luminescent layer 17 is drawn, which both the Triads and the interposed conductive strips 13 'covered and with the triads and the Strip 13 'is in contact.

Claims (2)

PATENT CLAIMS: 1. Screen for a color television display tube with filter strips covered by a white fluorescent material, which alternately allow different primary colors to pass through and are grouped into groups of three separated from one another by gaps, as well as with a continuous conductive layer from which index pulses are obtained, characterized in that opaque strips (12) are attached to the bottom of the tube (10) so that above the coherent, transparent conductive layer (13) and above this in the gaps between the opaque strips filter strip groups (14, 15, 16) are arranged, wherein the whole is covered by the coherent, white-luminescent phosphor layer (17). 2. TV screen according to claim 1, characterized in that a group of three of filter strips consists of butting, electrically insulating enamel strips. Considered publications:
German Auslegeschrift No. 1059 028;
U.S. Patent No. 2,777,087;
French patent specification No. 1117 202. For this purpose i sheet of drawings © 209 618/153 6.62