DE1939007C3 - Cathode ray color picture tube - Google Patents

Description

Ph further problems regarding the chemical include that the ambient light when operating the ibilitftt and the Nac iuehtdimer on. Red emit tube is absorbed in a greater proportion, so erende phosphors that are sufficiently stable and that the reproduced image contrast vsira, i _ne approximately with the other Leuc | u.stoiren compliance The invention is; In the following on the basis of the perfume end of the afterlightening period, a 5 position of an exemplary embodiment, explained in more detail, requires a higher beam current, around the same brightness.

The fluorescent substances emitting blue and green are shown in FIG. I a section through a three-strand Nirb

P% ichien. As a result, the overall feeling of the picture tube with shadow mask and.

^ The picture tube is greatly increased in height. It is also F g. 2 shows a section from the fluorescent screen in

It is nice to use the available direction of the arrow A for visualization purposes to produce the brightest possible aid with the usual hexagonal arrangement of luminescent tone and white reproduction. points and spaces.

W The object of the invention consists in the specification. The invention can be used in a three-color

Fewner combination of phosphors, which apply to a screen, such as is used in the case of various color reproduction of the objects to be photographed which is more faithful to the picture, for example, ears. It is solved according to the invention in the case of a cathode ray color image with focusing filter tubes, with penetration depths, a tube according to the preamble of claim 1 with projection tubes, with line raster index tubes fgf according to the invention by both nsit tins.ran W de? Longstanding combination of lighting and multi-beam systems. These combinations ",, open. 20 of three phosphors for color television purposes" earth ..

One of the reasons for the more lifelike harb- also known as P-22 umbrellas. The ^b ' ^lo ^ " ^ir "; Reproduction shows that green fluorescent material can be made of fluorescent material in a layer of lorm,

visibly - a radiation color eu \;> s into yellowish line form or point form: exist and we »exhausted, Μΐ is. This egg subjective emitting elements will not only contain and because he was made as ruiuraetreuer 25 known procedures for this purpose by ^ir ^ ^Näin color printing enjoyable.

* Is felt, but also the reproducible For example, the phosphor elements aurtn Ϊ color scale increases in accordance with the playback screen printing or photographic venanrei k _e jner larger number of the Farbschatticrunüen be formed in. . .

• the Na-> ir colors to be found. An embodiment of the invention is also growing in the light emitting from the green. 1 and 2 illustrates that a l ⁰ ™™ "■ itoffelementen of the excitation picture tube having a glass envelope 21 and Dreie ektronen- in the normal range '" ^ ": ■ the Laichtstoffelemeinte LleNtronen- used radiating system 23 comprising comprising three tlektroncn-

itstrahlstrom is much better linear with this. radiate onto the tnut on the opposite side. In addition, the hue of the screen cast by the piston 21 changes. The eigeni-Leuchistoffelementen emitted green light practically 35 Liehe phosphor screen 25 is of ^{a gla} ^ ^cr t.

- table not with the excitation strength. F_in another windshield 27, which is part of the Komensi advantage is that as a result of the color shift. The luminescent screen consists of a menr / ani mn, the green luminescent substance in yellowish for the reproduction of green or blue emitting phosphor points «. d of an achievable brightness and shade of white or C, which requires a smaller proportion of red on the inner surface 35 dir frontscine t , so that the 40 adhere. The phosphor dots are m a regular

- already heavily loaded red system with a smaller repeating pattern of groups of three oat

- Beam current strength comes from. The beam currents of all triples are arranged, whereby each Leucntstortpunki emc three systems are therefore better matched to one another. of the three colors emitted. Above this arrangement ν im

A considerable advantage of the fluorescent dots according to the invention is a reflective neutral

Phosphor combination also consists in the fact that the 45 coating 37 is made of aluminum. At a close distance from the red and green-emitting materials used, the front pane 27 is located in ^Richtul l | ^

. insensitive to copper contamination while Sirahl systems 23 are a metallic ^locn " ^asKe " V "of the manufacturing process of the color picture tube. a plurality of openings 41, each of which is associated with an opening, especially a color triple, activated with traces of copper and aluminum 50 is held by projections 45 which are ™ τ ™ "Zinkcadmiumsulhd which nieb due to the activation of the mask 39 springs 431 connected to the Koioen with copper to a copper impurity" 21 verbunder. The perforated mask 39 is so ™ ' ^scnen _ more so susceptible. The same applies to the ^{luminescent material emitting blue for the beam systems and the} / r0 "lscne ' ^be i', '" ¹ ^ ° ™ blue, the zinc sulfide activated with silver and net, da.T during operation of each of the three> opening of the magnesium , which is also relatively insensitive to copper impurities through the bena ei at a slightly different angle due to this reduced susceptibility to make and a different dye ηκ

: The reject rate is lower for grit impurities, the Tr.pels stimulates. So the ^Elek i ^ronens ' ^rah ' \ "] so that one comes to more favorable production costs. First beam system only the Ro en""! C.enden ^^

* ■ To a greater economic efficiency with the tube material dots, the electron beam from the two systems

Production also contributes to the fact that the ^F % ^ ° "P ^un ' ^ttc .'""" £ "

Phosphorus used zinc cadmium material less, electron beam from the third system nor the blue

namely only up to 10 <- / "compared to 35 to 40% emitting dye spots. Marriage ^ st ome

Cadmium requires commercial tubes than earlier. these rays can be red, green or blue

The inventive phosphor combination is called C ₅ beam current. ^The f " ^jm ^, _c , '" _nil

also gives a neutral gray color, which is not a current made up of the sum of the red, green and unü

yellowish hue, as was the case with the previously blue jet stream ™ together. hen _bes i _e

■ usual shame was the case. That leaves the red emitting lightening substance spots on it

preferably consisting essentially of yttrium oxisulfide with about 4.2 mole percent europium. This dye can be expressed by the molar formula

Yi..i «Eu ,,. _0M O _a S

represent, as the europium is 4.2 mole percent of d ^r r total amount of the yttrium plus the europium. The activator content (ie the europium) of this phosphor can be in the range from 2.5 to 5.3 mol percent of the total amount. At 2.5 to 3.0 mol percent europium the phosphor is brighter and somewhat less red, while at a content of 5 to 5.5 mol percent the phosphor is more intensely red but somewhat less bright. At around 5.0 mol percent europium, the CIE coordinates of the luminous fabric element are around X = 0.675 and Y - 0.325. At around 3.0 mol percent europium, the CIE coordinates are X = 0.663 and Y = 0.337. The family of red-emitting phosphors can be expressed by the molar formula

represent, where α is between 0.025 and 0.055 mol. The green-emitting phosphor elements can essentially consist of zinc or zinc cadmium sulfide with copper and aluminum activators. The molar ratio of zinc sulfide to cadmium sulfide is between 100: 0 and 90:10. It is known that with increasing cadmium sulfide content, at the expense of zinc sulfide, the color of the emission shifts to yellow in the spectrum. The copper activator content of this phosphor can be in the range from 0.001 to 0.100 percent by weight of the phosphor. The aluminum activator content of the phosphor can be in the range between 0.001 and 1.00 percent by weight of the phosphor. Phosphor elements made from such green-emitting phosphors have a light efficiency in the range from 20 to 100 lumens / watt and an afterglow duration between 10 and 100 μs. The family of green-emitting phosphors can be expressed by the molar formula

Zn ₁ -J ₁ Cd ₆ S: Cu (.r):

represent, where b is in the range from 0.00 to 0.10 mol, χ in the range from 0.001 to 0.100 percent by weight and y in the range from 0.001 to 0.100 percent by weight. The molar formula of each preferred green phosphor is approximately 0.928 ZnS · 0.072 CdS: Cu (0.006 percent by weight): Al (0 * 006 percent by weight). Green-emitting elements essentially consist of some fluorescent material from this family and are resistant to copper contamination in the manufacture of new tubes.

The blue-emitting elements consist essentially of zinc sulfide at 0.005 to 0.040 percent by weight, preferably 0.015 percent by weight a silver activator. The family of these blue-emitting phosphors can be determined by the molar shapes

ZnS .AgO)

represent, where y is in the range of 0.005 to 0.040 Ge weight percent. The family of preferred blue-emitting phosphors consists essentially of sulfide activated with silver, the composition of which is determined by the molar formula

ZnS: Ag (z): Mg (c)

can be represented, with ζ in the range from 0.015 to 0.040 percent by weight and r in the range is from 0.02 to 2.00 percent by weight.

In a preferred embodiment, ζ is 0.030 and c is 0.35. Blue-emitting elements essentially consist of a phosphor from this preferred family and are also used in the manufacture

ao position of a new tube resistant to Copper impurities. In general, the light efficiency of the blue-emitting elements is 3 to 15 lumens / watt and has an afterglow period of 10 to 1000 μβ. The CIE color coordinates of the

»5 blue-emitting elements are in the range from X = 0.140 to 0.160 and Y = 0.050 to 0.100.

It has been shown that this combination of different phosphor materials in a color picture tube provides significant manufacturing improvements the tube and also with regard to the operating behavior. The screen of the tube shows a total of one higher light efficiency.

The very specific combination of phosphors described leads to an enlargement of the whole

Light output power of at least 5%. The shade's color scale is more favorable in the yellow-green area. The CIE coordinates of the green phosphor are X ^ 0.311 and Y = 0.601. Both coordinate values are higher than the previously turned to green phosphors, where they are at X - ■ - 0.303 and Y = 0.587.

It has been shown that in normal operation the picture tube according to the invention has less X-ray radiation sends out as corresponding tubes with silver activated zinc cadmium sulfide as green emitting Fluorescent. However, a reduction in the X-ray emission is very desirable.

The zinc cadium sulfide of the green phosphor activated with copper and aluminum also needs

km in Herstetläftg iWflpgfi tmMäfeiÄen subsequent rinses unfold. Another advantage is that the light emitted by the green dye is not changed by changes in the manufacturing process for this dye, see above

that it emits later ": color predetermines itself lets and is constant.

1 sheet of drawings

Claims (3)

1 2 arranged in a regular, repetitive sequence Claims; and are tlurcj! r $ rien «of the several electron streaks scanning the screen for emission I, cathode ray color picture tube with a stimulated. In the case of shadow mask tubes, the Leudu-I fluorescent screen, an arrangement of red, staff elements, usually point-like in three-green and blue-emitting groups of materials, each of which emits a red in a regular, repeating sequence, and a green-emitting and a blue one device for exciting each of the elements contains a phosphor emitting point. A common, characterized by folic 2l "-Farbröhre has about 300,000 such triplets constricting combination of phosphors that namely io course, other geometiische Anordjjch are the red-emitting phosphor elements in voltages and shapes for the phosphor elements fm manner known per se in the other types of color picture tubes are possible,
a material of the formula You can basically any blue. (y- “EUff) .O, S Use green or red emitting fluorescent material. ¹ " ² S is. However, those used in practice exist, where α between 0.025 and 0.055 MoI picture tubes with the years in which the technology lies and the CIE coordinates of the red fluorescent substance has advanced and improvements have been achieved in a manner known per se ^ = 0.675 and production and operating behavior, Y = 0.325 amount to that the green emitting changed. Presently, certain combinations of phosphor elements are essentially one of three types of fluorescent materials used in the manufacture of commercially available tubes which can be reasonably manufactured; Ζη, -ftCdftS: Cu (.v): Al (v) ^{un <} * show usable operating properties, required Huh consist, where b is in the range from 0.00 to 0.10 mol. From Belgian patent specification 695 141 di> χ and y are in the range from 0.001 to 0.100 percent by weight of a red fluorescent substance with europium and the CIE coordinates JT = 0.311 activated yttrium oxysulfide in combination with Y = 0.601, and that the blue emit green and blue fluorescent lamps phosphor elements containing zinc cadmium are essentially known from zinc sulfide, the zinc sulfide of the blue being a material of the formula phosphors with a silver content of 0.005 bi-, ZnS: Ag (z): Mg (c) ³ ° 0.030 percent by weight can be activated. Furthermore K, it from the book »Luminescence of Solids« \ ον · exist, where ζ in the range from 0.005 to 0.040 leverence, published in 1950 by John Wiley &
Weight percent, and c in the Br-calibration of 0.02 to New York, p.198 to 201, known is as Grünleuchi 2, i (X) weight percent, and in known _sto jf zinc cadmium sulfide with a copper activator, the CIE coordinates X 'iui. Range between 35 percent before 0.005 or 0.1 percent by weight to 0.140 and 0.160 and Y between 0.050 and 0.100 den. Zinc cadmium sulfide as a green lead is also available. from U.S. Patents 3,308,326 and 3,271,51: 2. Cathode ray color picture tube according to claim known. 1, characterized in that the green emits- In a color picture tube with three different types Generating phosphor elements essentially consist of 40 phosphors for the emission of the colors red and green a phosphor of molar composition and blue is the rendering of images of good color 0.928 Zns · 0.072 CdS: Cu (0.006 weight accuracy despite the conceptually simple principle one percent): Al (0.006 percent by weight) consist. complicated matter if you look ahead 3. Cathode ray color picture tube according to claim eyes h'lit that the phosphors with regard to 1, characterized in that the zinc sulfide of 45 their brightness with the same excitation and afterglow blue emitting phosphor with 0.030 Go time and that the human eye for weight percent silver and 0.35 weight percent the three colors have a different sensitivity Magnesium is activated. has, so the three colors with absolutely the same radiated Perceives brightness as differently bright. 50 lim to compensate for these differences in sensitivity, you have to take certain compensatory measures for the provide three colors. With the commercially available For example, shadow mask color picture tubes must for a reproduction perceived as white 60 ° / ₀ der 55 total brightness from the green fluorescent elements and in each case 20% ^v n ° blue and red light-emitting The invention relates to cathode ray color fabric elements being supplied. This inequality picture tube with a fluorescent screen, which requires an arrangement normally corresponding to unequal beam of Fluorescent currents emitting red, green and blue to excite the fluorescent elements and elements in a regular, repetitive sequence 60 in connection with a relatively high total and means for exciting each of the elements jet stream. However, have unequal jet currents having. different service lives of the three cathodes of the Commercially available picture tubes for color television receivers result in three beam systems, so that with increasing ger, cathode ray tubes with a luminous * tube aging color shifts in the display screen, which mainly occur in a large number of red, 65 image. Green or blue-emitting phosphor elements With regard to the red-emitting phosphors having. These elements are usually on the tide besides the low sensitivity of the human being inside the front screen of the picture tube in a lent eye, which requires a greater brightness,