EP0883155B1 - Farbbildröhre - Google Patents

Farbbildröhre Download PDF

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Publication number
EP0883155B1
EP0883155B1 EP98304353A EP98304353A EP0883155B1 EP 0883155 B1 EP0883155 B1 EP 0883155B1 EP 98304353 A EP98304353 A EP 98304353A EP 98304353 A EP98304353 A EP 98304353A EP 0883155 B1 EP0883155 B1 EP 0883155B1
Authority
EP
European Patent Office
Prior art keywords
phosphor
red
emitting phosphor
colour
blue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98304353A
Other languages
English (en)
French (fr)
Other versions
EP0883155A1 (de
Inventor
Norio Koike
Hidemi Matsuda
Yoshinori Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP0883155A1 publication Critical patent/EP0883155A1/de
Application granted granted Critical
Publication of EP0883155B1 publication Critical patent/EP0883155B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
    • H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
    • H01J29/322—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television with adjacent dots
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/26—Luminescent screens with superimposed luminescent layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/185—Luminescent screens measures against halo-phenomena

Definitions

  • the present invention relates to a colour picture tube, in particular, to a colour picture tube having a large red reproducible region of a phosphor screen.
  • a conventional colour picture tube has an enclosure composed of a panel, a funnel, and a neck.
  • a phosphor screen composed of a blue-emitting phosphor, a green-emitting phosphor, and a red-emitting phosphor is disposed on an inner surface of the panel. Electron beams emitted from an electron gun are scanned to the phosphor screen through a shadow mask. Thus, a colour picture is displayed.
  • As important properties of the phosphor screen of a colour picture tube there are brightness, contrast and colour purity of blue, green, and red that define the colour reproducible region.
  • the properties of the phosphor screen largely depend on the light-emitting properties of individual phosphors that compose the phosphor screen.
  • a blue-emitting phosphor is composed of ZnS:Ag.
  • a green-emitting phosphor is composed of ZnS:Cu, Au, Al, ZnS:Cu, Al, or a mixture thereof.
  • a red-emitting phosphor is composed of Y 2 O 2 S:Eu.
  • the emitting colour thereof is almost proportional to the concentration of Eu that is used as an activator.
  • the redness namely, the red colour reproducible region
  • the concentration of Eu is reversely proportional to the red colour brightness.
  • Y 2 O 2 S:Eu containing 3 to 7 % by weight of Eu is preferably used as the material of the red-emitting phosphor.
  • Table 1 lists measured values of a 43.2 cm (17-inch) colour picture tube of which pitches of phosphor dots are 0.28 mm.
  • colour picture tubes have been widely used as display means for computers and so forth.
  • the colour purity of blue, green, and red in these colour picture tubes should be improved for a wide colour reproducible region.
  • the concentration of Eu should preferably be increased although the red colour brightness tends to decrease whilst the cost of the phosphor increases.
  • EP-A-0 129 620 describes improvement in colour purity by changing the size of the phosphors. By increasing the size of the red phosphor dots, the lower efficiency of the red phosphor can be compensated for.
  • An object of the present invention is to provide a colour picture tube that allows the colour purity of red to be improved without any or any significant decrease of colour brightness of the phosphor screen, or without the need to increase the concentration of Eu.
  • the present invention provides a colour picture tube, comprising a panel and a phosphor screen disposed on an inner surface of the panel, the phosphor screen being composed of a blue-emission phosphor, a green-emitting phosphor, and a red-emitting phosphor, wherein the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor is 1.40 or more.
  • the blue-emitting phosphor is preferably composed of silver-activated zinc sulfide (ZnS:Ag) containing 0.015 to 0.08 % by weight of silver (Ag).
  • the red-emitting phosphor is preferably composed of europium-activated yttrium oxysulfide (Y 2 O 2 S:Eu) containing 3.5 % to 6.1 % by weight of europium (Eu).
  • Colour filters corresponding to the blue-emission phosphor, the green-emitting phosphor, and the red-emitting phosphor are preferably disposed between the phosphor screen and the panel.
  • Fig.1 is a sectional view showing the structure of a colour picture tube according to an embodiment of the present invention.
  • the colour picture tube has an enclosure 4 composed of a transmission panel 1, a funnel 2, and a neck 3.
  • a phosphor screen 5 (that will be described later) is disposed on an inner surface of the panel 1.
  • a shadow mask 6 is set close to the inner surface of the phosphor screen 5.
  • An electron gun 7 that emits electron beams 6B, 6G, and 6R is disposed in the neck 3 of the enclosure 4.
  • An inner shield 8 is disposed inside the funnel 2 and connected to the shadow mask 6. The inner shield 8 shields the electron beams 6B, 6G, and 6R emitted from the electron gun 7 from an outer magnetic field.
  • a deflecting unit 9 is disposed outside the funnel 2.
  • the deflecting unit 9 generates a magnetic field and thereby deflects the electron beams 6B, 6G, and 6R emitted from the electron gun 7.
  • the electron beams 6B, 6G, and 6R deflected by the deflecting unit 9 horizontally and vertically scan the phosphor screen 5 through the shadow mask 6. Thus, a colour picture is displayed on the panel 1.
  • the phosphor screen 5 is composed of a matrix of a light absorbing layer 10 and phosphor dots 11B, 11G, and 11R.
  • the phosphor dots 11B, 11G, and 11R are regularly disposed in respective circular spaces of the light absorbing layer 10.
  • colour. filters 12B, 12G, and 12R corresponding to the phosphor dots 11B, 11G, and 11R may be disposed between the phosphor dots 11B, 11G, and 11R and the panel 1, respectively, as shown in Fig. 3.
  • the blue-emitting phosphor dot 11B is composed of ZnS:Ag.
  • the green-emitting phosphor dot 11G is composed of ZnS:Cu, Au, Al, ZnS:Cu, Al, or a mixture thereof.
  • the red-emitting phosphor dot 11R is composed of Y 2 O 2 S:Eu.
  • the concentration of Ag that is an activator of the blue-emitting phosphor ZnS:Ag is in the range from 0.015 to 0.08 % by weight.
  • the concentration of Eu that is an activator of the red-emitting phosphor Y 2 O 2 S:Eu is in the range from 3.5 to 6.1 % by weight.
  • the blue filter 12B shown in Fig. 3 is composed of a pigment such as cobalt aluminate, ultramarine, or the like that has a spectral reflectance as represented, for example, by a curve 13 in Fig. 4A and effectively transmitsthe light from the blue-emitting phosphor.
  • the green filter 12G is composed of a pigment such as TiO 2 -NiO-CoO-ZnO, CoO-Al 2 O 3 -Cr 2 O 3 -TiO 2 , or the like that has a spectral reflectance as represented, for example, by a curve 14 in Fig. 4B and effectively transmitsthe light from the green-emitting phosphor.
  • the red filter 12R is composed of a pigment such as ferric oxide, anthraquinone, or the like that has a spectral reflectance as represented, for example, by a curve 15 in Fig. 4C and effectively transmitsthe light from the red-emitting phosphor.
  • the phosphor screen 5 can be formed by a photographic printing method with a photo mask of a shadow mask.
  • a photosensitive material is coated on the inner surface of the panel 1.
  • the photosensitive material is dried and thereby a photoresist 16 is formed.
  • the photoresist 16 is exposed through the shadow mask 6.
  • a pattern corresponding to electron beam guide holes 17 of the shadow mask 6 is printed on the photoresist 16 (see Fig. 5A).
  • the patterned photoresist 16 is developed and thereby a resist 18 with a pattern corresponding to the electron beam guide holes 17 of the shadow mask 6 is formed (see Fig. 5B).
  • a black light absorbing paint is coated on the inner surface of the panel 1 on which the resist 18 has been formed.
  • the black light absorbing paint is dried and thereby a light absorbing layer 19 is formed (see Fig. 5C). With a remover, the light absorbing paint 19 is removed along with the resist 18. Thus, a matrix-shaped light absorbing layer 10 that has circular spaces 20 is formed on the inner surface of the panel 1 (see Fig. 5D).
  • a phosphor slurry whose main components are a blue-emitting phosphor and a photosensitive material is coated on the inner surface of the panel 1 (on which the matrix-shaped light absorbing layer 10 has been formed). Thereafter, the phosphor slurry is dried. Thus, a phosphor slurry layer 21 is formed (see Fig. 5E). Next, the phosphor slurry layer 21 is exposed through the shadow mask 6 and thereby a pattern corresponding to the electron beam guide holes 17 of the shadow mask 6 is patterned on the phosphor slurry layer 21.
  • the patterned phosphor slurry layer 21 is developed and thereby the blue-emitting phosphor dot 11B is formed in a predetermined space of the light absorbing layer 10 (see Fig. 5F).
  • Figs. 5E and 5F of the blue-emitting phosphor are repeated.
  • the green-emitting phosphor dot 11G and the red-emitting phosphor dot 11R are formed in respective predetermined spaces of the light absorbing layer 10 (see Fig. 5G).
  • a pigment dispersion solution mainly composed of a pigment, a polymer electrolyte, and a photosensitive material is coated and dried.
  • a pigment layer is formed.
  • the phosphor dots 11B, 11G, and 11R are formed.
  • the blue-emitting phosphor dot 11B is composed of ZnS:Ag containing 0.015 to 0.08 % by weight of Ag as an activator.
  • the red-emitting phosphor dot 11R is composed of Y 2 O 2 S:Eu containing 3.5 to 6.1 % by weight of Eu as an activator.
  • the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor is 1.40 or more.
  • the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor largely affects the increase of the color reproducible region.
  • the chromaticity value x of the blue-emitting phosphor is much smaller than the chromaticity value x of the red-emitting phosphor.
  • the colour picture tube has the shadow mask 6, the inner shield 8, and so forth in the paths of the electron beams 6B, 6G, and 6R.
  • the electron beam 6R causes the red-emitting phosphor dot 11R to selectively light
  • the electron beam 6R collides with the shadow mask 6, the inner shield 8 and so forth and thereby scatters. Consequently, the scattered electron beam 6R causes the adjacent blue-emitting phosphor dot 11B and green-emitting phosphor dot 11G to light.
  • an additive colour mixing takes place and thereby the chromaticity value varies.
  • Table 2 lists experimental results for variations of chromaticity values due to the additive colour mixing.
  • red chromaticity values due to the additive colour mixing.
  • Table 2 lists experimental results for variations of chromaticity values due to the additive colour mixing.
  • using a single colour tube 43.2 cm (17 inches; phosphor dot pitches 0.28 mm) having only red-emitting phosphor dots and a three- colour tube (conventional colour picture tube) having blue, green, and red-emitting phosphor dots.
  • red chromaticity values x largely vary.
  • the ratio A/B was varied in the condition that the coating amount of the blue-emitting phosphor was kept at 46 ⁇ 1 mg in 16 cm 2 and that the coating amount of the red-emitting phosphor was varied in the range from 50 mg to 75 mg in 16 cm 2 .
  • Table 3 and Fig. 6 show the experimental results.
  • the experimental results show that the red chromaticity is proportional to the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor.
  • the cases of A/B being lower than 1.4 do not form part of the invention but are useful for understanding the invention.
  • the red chromaticity value x should be 0.612 or more. To satisfy this condition, it is clear that the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor should be 1.40 or more.
  • a colour picture tube having a phosphor screen composed of a matrix-shaped light absorbing layer and blue, green, and red-emitting phosphor dots regularly formed in circular spaces of the light absorbing layer was described.
  • a colour picture tube having colour filters disposed between phosphor dots and a panel was described.
  • the present invention can be applied to a colour picture tube having a phosphor screen composed of a stripe-shaped light absorbing layer and red, green, and red-emitting phosphor stripes regularly disposed in the stripe-shaped spaces of the light absorbing layer.
  • the present invention can be applied to a colour picture tube having colour filters disposed between the phosphor stripes and the panel.
  • the present invention can be applied to a colour picture tube that does not have the above-described matrix-shaped or stripe-shaped light absorbing layer.
  • a colour picture tube having a phosphor screen composed of a blue-emitting phosphor, a green-emitting phosphor, and a red-emitting phosphor since the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor is 1.40 or more, the red chromaticity is improved without a decrease of the brightness of the phosphor screen. Thus, a colour picture tube with a wide colour reproducible region can be obtained.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Luminescent Compositions (AREA)

Claims (3)

  1. Farbbildröhre, umfassend:
    einen Panel (1); und
    einen Phosphorbildschirm (3), der auf einer inneren Oberfläche des Panels (1) angebracht ist, wobei der Phosphorbildschirm (3) aus einem blau emittierendem Phosphor (11B), einem grün emittierenden Phosphor (11G) und einem rot emittierenden Phosphor (11R) besteht, wobei das Verhältnis A/B der Helligkeit A des rot emittierenden Phosphors zur Helligkeit B des blau emittierenden Phosphors 1,40 oder mehr ist.
  2. Farbbildröhre gemäß Anspruch 1, wobei der blau emittierende Phosphor aus Silber-aktiviertem Zinksulfid besteht, das 0,015 bis 0,08 Gew.-% Silber enthält, und wobei der rot emittierende Phosphor aus Europiumaktiviertem Yttriumoxysulfid besteht, das 3,5 bis 6,1 Gew.-% Europium enthält.
  3. Farbbildröhre gemäß Anspruch 1 oder 2, wobei die Farbfilter (12B, 12G, 12R), die dem blau emittierenden Phosphor (12B), dem grün emittierenden Phosphor (12G) und dem rot emittierenden Phosphor (12R) entsprechen zwischen dem Phosphorbildschirm und dem Panel angebracht sind.
EP98304353A 1997-06-04 1998-06-02 Farbbildröhre Expired - Lifetime EP0883155B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP14653297 1997-06-04
JP9146532A JPH10334823A (ja) 1997-06-04 1997-06-04 カラー受像管
JP146532/97 1997-06-04

Publications (2)

Publication Number Publication Date
EP0883155A1 EP0883155A1 (de) 1998-12-09
EP0883155B1 true EP0883155B1 (de) 2002-11-06

Family

ID=15409782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98304353A Expired - Lifetime EP0883155B1 (de) 1997-06-04 1998-06-02 Farbbildröhre

Country Status (7)

Country Link
EP (1) EP0883155B1 (de)
JP (1) JPH10334823A (de)
KR (1) KR100271709B1 (de)
CN (1) CN1104024C (de)
DE (1) DE69809127T2 (de)
MY (1) MY120987A (de)
TW (1) TW388911B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100932991B1 (ko) * 2003-11-29 2009-12-21 삼성에스디아이 주식회사 전계 방출 표시 장치 및 그의 제조방법
US8602616B2 (en) * 2008-11-14 2013-12-10 Koninklijke Philips N.V. Lamp for a headlight of a motor vehicle
FR3022555B1 (fr) * 2014-06-23 2017-12-22 Saint-Gobain Cristaux Et Detecteurs Materiau luminescent a couche photonique texturee

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129620A1 (de) * 1983-06-23 1985-01-02 International Business Machines Corporation Farbkathodenstrahlrohr mit Phosphormuster
KR900003430B1 (ko) * 1985-07-15 1990-05-18 가세이 오프토닉스 가부시끼가이샤 전자선 여기 표시관
GB2240213A (en) * 1990-01-23 1991-07-24 British Broadcasting Corp Colour display device
DE69215453T2 (de) * 1991-03-14 1997-03-27 Kasei Optonix, Ltd., Tokio/Tokyo Farb-kathodestrahlrohr
EP0720201B1 (de) * 1994-12-26 1999-02-17 Kabushiki Kaisha Toshiba Bildschirm und Verfahren zur Herstellung desselben

Also Published As

Publication number Publication date
DE69809127D1 (de) 2002-12-12
KR19990006768A (ko) 1999-01-25
TW388911B (en) 2000-05-01
DE69809127T2 (de) 2003-10-09
KR100271709B1 (ko) 2000-11-15
JPH10334823A (ja) 1998-12-18
MY120987A (en) 2005-12-30
CN1201248A (zh) 1998-12-09
EP0883155A1 (de) 1998-12-09
CN1104024C (zh) 2003-03-26

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