CA1121857A - Colour selection electrode for colour display tube - Google Patents
Colour selection electrode for colour display tubeInfo
- Publication number
- CA1121857A CA1121857A CA000313787A CA313787A CA1121857A CA 1121857 A CA1121857 A CA 1121857A CA 000313787 A CA000313787 A CA 000313787A CA 313787 A CA313787 A CA 313787A CA 1121857 A CA1121857 A CA 1121857A
- Authority
- CA
- Canada
- Prior art keywords
- colour
- rows
- selection electrode
- display
- lines
- 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
Links
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
- H01J29/06—Screens for shielding; Masks interposed in the electron stream
- H01J29/07—Shadow masks for colour television tubes
- H01J29/076—Shadow masks for colour television tubes characterised by the shape or distribution of beam-passing apertures
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
20.2.1978 ABSTRACT :
By using in a colour display tube a colour selection electrode comprising a metal plate having a large number of rows of apertures which are separated from each other by bridges and are elongate in the direction of the rows, which rows extend in the direction of the phosphor lines on the display screen and in which the last aperture at the two ends of each row is at least as long as the penultimate aperture at the two ends of each row and the short sides of the last aperture of all rows situated at the extreme ends are situated on curved lines which follow the edge of the colour selection electrode, a smooth picture edge and also a good adhesion of the ends of the phosphor lines to the display window are obtained.
By using in a colour display tube a colour selection electrode comprising a metal plate having a large number of rows of apertures which are separated from each other by bridges and are elongate in the direction of the rows, which rows extend in the direction of the phosphor lines on the display screen and in which the last aperture at the two ends of each row is at least as long as the penultimate aperture at the two ends of each row and the short sides of the last aperture of all rows situated at the extreme ends are situated on curved lines which follow the edge of the colour selection electrode, a smooth picture edge and also a good adhesion of the ends of the phosphor lines to the display window are obtained.
Description
112~857 The invention relates to a colour display tube comprising in an evacuated envelope consisting of a display window, a cone and a neck, a display screen on the inside of the display window consisting of a large number of phosphor lines luminescing in three different colours and, at some distance in front of the display screen, a colour selection electrode comprising a metal plate having a very large number of rows of apertures which are separated from each other by bridges and are elongate in the direction of the rows, the said rows extending in the direction of the phosphor lines.
Such a colour display tube is disclosed in United States Patent Specification 3,983,613 which issued to Zenith Radio Corporation on October 5, 1976. During the manufacture of the display screen, a photosensitive phosphor-containing layer is provided a few times success-ively (usually 3 times) on the display window which is then exposed via the elongate apertures in the colour selection electrode and is then fixed, so that the phosphor lines are formed on the display screen. The said exposure is carried out by means of an elongate light source whose longitudinal axis extends in the direction of the rows of apertures, so that the light distribution behind the rows of apertures which are separated by bridges is as homogene-ous as possible. It has now been found that the adhesion ~b B ~
l~Z~7 PFIN. 8921.
21-2-1978.
of the ends of thc phosphor lines :irn the tubes man1lfac-t-ured so far h.as le:ft someth.ing to be~ dcsired. ~ staggerecl variat:i.on caused by the ends of the :rows of apert;u:res, as sho~i~n in the Uni.ted States Patel1.t Specificdtion 3,983,613, 5 also proved to be a less beautiful pi.c:ture boundary, and tbe adhesion of the ends of the p]lOSphOI llnes still leaves something to be desired.
It is therefore the objec-t of the invent:ion to provide a colour display tube ill which the apertures follow the upper and lower edges of the colour selection electrode a.nd in w1lich a good adhesion of the ends of th.e phospllor lines is obtained.
Accord:in~ to the in~enti.o]l a colour disp]ay tube o~ t;he h:i.nd described in the f:irst paragraph i.s cha-racter~zed in that the last aperture at the two ends of cach row be;ng at least equally long as the penultimate aperture at the two cnds of each row, and the shor-t sicles of the lclst apert.ures of all ro~s situated at the extrenle ends are situated on lines whic}l fo].]ow the edges of the colour se].ect:ion el.ectrode. Gerlerally th.ese edges are curved si.nce the aperture which :is situated at the ends o~ each row i.s as long as but usually is longer than the penull-ilnate apertllre, more l;.ght wi]]. :i.mpinge on tlle pllotosellsiti~e phosp}l.or-contajll.i.ng l.ayer durirlg exposure and the enl of` tile ~ osphor line will. adhere bel:ter to the inner ~al:l~. of the disp1ay window.
1~21857 PIIN. 8g21.
21-2-l97~.
Tlle illventi.oIl will no~ ~e e~plained and describea. i.n grea-te:r detai:l.l)y way of exa.lnple with re-ference to the accolnpclnying drawillgs in wJlicl3 Figu]:~e 1 is a perspect:ive view, part]y broken away, of a co]our disp:Lay tube made i31 accordance w-itll tlle inventlon~
Fi.gure 2 is a perspecti.ve view of the en.-ci.rcled part of the co]our selectiolL e]ectrode and. tlle di~splay scree-n, Figures 3 and ll are e:Leva-t:ions Or a part Or the upper edge of a colour select:ion e:Lectrode as used so :E`f.lr, anc3 ~igure 5 is an elevation of a par-t of the upper edge of a co.l.our se].ec-tion electrode used in the cathorle ray tul)e made i.n accordaIlcé with the invelltio:rl.
~igure 1 is a perspective view, partly broken away, of a colollr dis1~l.ay tube mcade in accordance W.it~l the ill~relltion. This colour di.sp]ay tube comprises a glass enve]ope 1 wlllc}1 is composed of a display w:indo~.~ 2, .a ~0 co-ne 3 and a necl~ 4 llaving contact pins 5. Three electron gl7ns 6, 7 ana 8 are situatecl in tlle Ileck. The a~.es of t;hese g~1115 fLre si.tua-ted il1 Oll.C hori~c):r1t;al p..ane an.d the outer-lllOSt gUJlS enclose a sma].]. arlgl.e with lhe celltral. gW11, SO
t]lat i]~e g~eIle.ratec3 e].ec-tron ~earls 9, 10 aIId 11 pflSS t}]rOl.lg'n apertu:les 1~ in a colo7~r selec-ti.on e:l.cc-trode 13 a-t an ~l71g7l.e an(3 l:}J11S eaC]l ilrlllillge on p]lospllor l:i.nes 14-, 15 all(l llZ1857 PlIN. 8921 21-2-l978.
16, respec-tive:ly. TlIe ~7hole display screeIl 17 CoIlSi.StS
of such triplets of phosphor lines of wI-Iich three are shown. Phospho-r li.ne 14 is a phosplIor lu~iDescil~g red (R)s phosphor line 15 .is a phospIIor ]uminescing ~reen (G) and phosphor ].ine 1~ is a phospI1or lu.7rlirIescillg blue (B). Co~oux select:Lon elect:-rode 13 cons~sts o.f a metal plate having a very large nun1ber of rows-~f aper-tures 12 e~teI~ding in -the direction of the phosp]lor li.n.es~ which plate is secured il- a metal ring 18 ~7hich is moull-ted in the display t1lbe in front of the display screeIl.
~.gure 2 is a perspect:ive view of a part of th.e colc>u.r se]eetion electrocle 13 aI~d the disp]ay - screen 17. The apert.ures 12 of eac]) row are sepa:rated by bridges 19. The elongate apertures usua:Lly I~ave roullcled-off ;hort sides.
~igure 3 is an elevation of a part of an upper edge of a ~nown colour selection electroc]e. ~s a result of the curved shape of tIIe said upper edge, aper-tures 20 are obtained ~7hich are shorter t}Ian the adjaccIIt apertu.res 12. Duri.ng tIIe rnanuf`acture of the displ:ay scree an i.lIsuff;c;eilt amollrIt of lig]1t; passes througI1 -the sa:id apertures nn~l an unsclti.sractory cldtle.si.on of the ends o~
tI1e phosp]-Io:r :Lines to the disp:L.--~r window is obtained.
u-re 1l ;s .lJl elevati on of a part of the ~5 uppcr ~dge of 'h-3 colour select:ion elect:rode 1S discloscd in IJ1li-t:ed S-tr1tes Pate:~-t Specif;ccl-tioIl 3,~3,613. rhe l~Z1857 Pll~. ~g.21.
21-2-197~7.
smaller a,per1;ures are omitted. The pic-ture bounc1ary in th:i.s case i.s less leautifu].-th.ln tl~e picl.ure boun.dary showZ~ in Figure 3 and the adllesion of -the ends of the phospllor 'Lines sti,ll leaves some1;hing to be desired.
~igure 5 is an elevat:ion of` a part of the upper.edge of`'the colour solec-tion e:lectrode'to be used in th.e ca-thode ray tube shown in F;gllre 1. Tlle length of the last apertures.22 i.s always la:rge:r than or equal to the lengl;h Or tbe adjacen-t apertures 12 in~the ow. ~s a result'of` this, t]:l.e short sides of thc last apertures, 22 of all l'OWS situa.ted at the ex-tren~e ond are s:ituated on a 5Irloot}L curved ],i,rle wh:i.ch foll.ows I;lle edge 21 of t'he colour selection clect;ro-1e. Since tlle aper:tures 22 are extra l.ong a bette]- adhcsion of` thc ~llospllor ]:i.nes to the i,nner ~all of the display window is obtai,n.ecl d.uring the maIlufncture Or thc sai.d ]ines as a resu].t of the extra good exposllre at t,he ellds. These loilger apertu:res at the sanle tinne ensure a beautif`lll slnoo-til p:icl;ure boun.dary.
.
Such a colour display tube is disclosed in United States Patent Specification 3,983,613 which issued to Zenith Radio Corporation on October 5, 1976. During the manufacture of the display screen, a photosensitive phosphor-containing layer is provided a few times success-ively (usually 3 times) on the display window which is then exposed via the elongate apertures in the colour selection electrode and is then fixed, so that the phosphor lines are formed on the display screen. The said exposure is carried out by means of an elongate light source whose longitudinal axis extends in the direction of the rows of apertures, so that the light distribution behind the rows of apertures which are separated by bridges is as homogene-ous as possible. It has now been found that the adhesion ~b B ~
l~Z~7 PFIN. 8921.
21-2-1978.
of the ends of thc phosphor lines :irn the tubes man1lfac-t-ured so far h.as le:ft someth.ing to be~ dcsired. ~ staggerecl variat:i.on caused by the ends of the :rows of apert;u:res, as sho~i~n in the Uni.ted States Patel1.t Specificdtion 3,983,613, 5 also proved to be a less beautiful pi.c:ture boundary, and tbe adhesion of the ends of the p]lOSphOI llnes still leaves something to be desired.
It is therefore the objec-t of the invent:ion to provide a colour display tube ill which the apertures follow the upper and lower edges of the colour selection electrode a.nd in w1lich a good adhesion of the ends of th.e phospllor lines is obtained.
Accord:in~ to the in~enti.o]l a colour disp]ay tube o~ t;he h:i.nd described in the f:irst paragraph i.s cha-racter~zed in that the last aperture at the two ends of cach row be;ng at least equally long as the penultimate aperture at the two cnds of each row, and the shor-t sicles of the lclst apert.ures of all ro~s situated at the extrenle ends are situated on lines whic}l fo].]ow the edges of the colour se].ect:ion el.ectrode. Gerlerally th.ese edges are curved si.nce the aperture which :is situated at the ends o~ each row i.s as long as but usually is longer than the penull-ilnate apertllre, more l;.ght wi]]. :i.mpinge on tlle pllotosellsiti~e phosp}l.or-contajll.i.ng l.ayer durirlg exposure and the enl of` tile ~ osphor line will. adhere bel:ter to the inner ~al:l~. of the disp1ay window.
1~21857 PIIN. 8g21.
21-2-l97~.
Tlle illventi.oIl will no~ ~e e~plained and describea. i.n grea-te:r detai:l.l)y way of exa.lnple with re-ference to the accolnpclnying drawillgs in wJlicl3 Figu]:~e 1 is a perspect:ive view, part]y broken away, of a co]our disp:Lay tube made i31 accordance w-itll tlle inventlon~
Fi.gure 2 is a perspecti.ve view of the en.-ci.rcled part of the co]our selectiolL e]ectrode and. tlle di~splay scree-n, Figures 3 and ll are e:Leva-t:ions Or a part Or the upper edge of a colour select:ion e:Lectrode as used so :E`f.lr, anc3 ~igure 5 is an elevation of a par-t of the upper edge of a co.l.our se].ec-tion electrode used in the cathorle ray tul)e made i.n accordaIlcé with the invelltio:rl.
~igure 1 is a perspective view, partly broken away, of a colollr dis1~l.ay tube mcade in accordance W.it~l the ill~relltion. This colour di.sp]ay tube comprises a glass enve]ope 1 wlllc}1 is composed of a display w:indo~.~ 2, .a ~0 co-ne 3 and a necl~ 4 llaving contact pins 5. Three electron gl7ns 6, 7 ana 8 are situatecl in tlle Ileck. The a~.es of t;hese g~1115 fLre si.tua-ted il1 Oll.C hori~c):r1t;al p..ane an.d the outer-lllOSt gUJlS enclose a sma].]. arlgl.e with lhe celltral. gW11, SO
t]lat i]~e g~eIle.ratec3 e].ec-tron ~earls 9, 10 aIId 11 pflSS t}]rOl.lg'n apertu:les 1~ in a colo7~r selec-ti.on e:l.cc-trode 13 a-t an ~l71g7l.e an(3 l:}J11S eaC]l ilrlllillge on p]lospllor l:i.nes 14-, 15 all(l llZ1857 PlIN. 8921 21-2-l978.
16, respec-tive:ly. TlIe ~7hole display screeIl 17 CoIlSi.StS
of such triplets of phosphor lines of wI-Iich three are shown. Phospho-r li.ne 14 is a phosplIor lu~iDescil~g red (R)s phosphor line 15 .is a phospIIor ]uminescing ~reen (G) and phosphor ].ine 1~ is a phospI1or lu.7rlirIescillg blue (B). Co~oux select:Lon elect:-rode 13 cons~sts o.f a metal plate having a very large nun1ber of rows-~f aper-tures 12 e~teI~ding in -the direction of the phosp]lor li.n.es~ which plate is secured il- a metal ring 18 ~7hich is moull-ted in the display t1lbe in front of the display screeIl.
~.gure 2 is a perspect:ive view of a part of th.e colc>u.r se]eetion electrocle 13 aI~d the disp]ay - screen 17. The apert.ures 12 of eac]) row are sepa:rated by bridges 19. The elongate apertures usua:Lly I~ave roullcled-off ;hort sides.
~igure 3 is an elevation of a part of an upper edge of a ~nown colour selection electroc]e. ~s a result of the curved shape of tIIe said upper edge, aper-tures 20 are obtained ~7hich are shorter t}Ian the adjaccIIt apertu.res 12. Duri.ng tIIe rnanuf`acture of the displ:ay scree an i.lIsuff;c;eilt amollrIt of lig]1t; passes througI1 -the sa:id apertures nn~l an unsclti.sractory cldtle.si.on of the ends o~
tI1e phosp]-Io:r :Lines to the disp:L.--~r window is obtained.
u-re 1l ;s .lJl elevati on of a part of the ~5 uppcr ~dge of 'h-3 colour select:ion elect:rode 1S discloscd in IJ1li-t:ed S-tr1tes Pate:~-t Specif;ccl-tioIl 3,~3,613. rhe l~Z1857 Pll~. ~g.21.
21-2-197~7.
smaller a,per1;ures are omitted. The pic-ture bounc1ary in th:i.s case i.s less leautifu].-th.ln tl~e picl.ure boun.dary showZ~ in Figure 3 and the adllesion of -the ends of the phospllor 'Lines sti,ll leaves some1;hing to be desired.
~igure 5 is an elevat:ion of` a part of the upper.edge of`'the colour solec-tion e:lectrode'to be used in th.e ca-thode ray tube shown in F;gllre 1. Tlle length of the last apertures.22 i.s always la:rge:r than or equal to the lengl;h Or tbe adjacen-t apertures 12 in~the ow. ~s a result'of` this, t]:l.e short sides of thc last apertures, 22 of all l'OWS situa.ted at the ex-tren~e ond are s:ituated on a 5Irloot}L curved ],i,rle wh:i.ch foll.ows I;lle edge 21 of t'he colour selection clect;ro-1e. Since tlle aper:tures 22 are extra l.ong a bette]- adhcsion of` thc ~llospllor ]:i.nes to the i,nner ~all of the display window is obtai,n.ecl d.uring the maIlufncture Or thc sai.d ]ines as a resu].t of the extra good exposllre at t,he ellds. These loilger apertu:res at the sanle tinne ensure a beautif`lll slnoo-til p:icl;ure boun.dary.
.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS
1. A colour display tube comprising in an evacuated envelope consisting of a display window, a cone and a neck, a display screen on the inside of the display window consisting of a large number of phosphor lines luminescing in three different colours and, at some distance in front of said display screen, a colour selection electrode comprising a metal plate having a very large number of rows of apertures which are separ-ated from each other by bridges and are elongate in the direction of the rows, the said rows extending in the direction of the phosphor lines, characterized in that the last aperture at the two ends of each row being at least equally long as the penultimate aperture at the two ends of each row, and the short sides of the last apertures of all rows situated at extreme ends of the rows are situated on lines which follow the edges of the colour selection electrode.
2. A colour display tube as claimed in Claim 1, wherein the edges of the colour selection electrode are curved.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7711713A NL7711713A (en) | 1977-10-26 | 1977-10-26 | COLOR IMAGE TUBE. |
| NL7711713 | 1977-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1121857A true CA1121857A (en) | 1982-04-13 |
Family
ID=19829406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000313787A Expired CA1121857A (en) | 1977-10-26 | 1978-10-19 | Colour selection electrode for colour display tube |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0001673B1 (en) |
| JP (1) | JPS5471556A (en) |
| CA (1) | CA1121857A (en) |
| DE (1) | DE2860435D1 (en) |
| ES (1) | ES474452A1 (en) |
| IT (1) | IT1099429B (en) |
| NL (1) | NL7711713A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5814735A (en) * | 1981-07-20 | 1983-01-27 | 忠見 佳彦 | Manufacture of interior finish material |
| JPS5840745A (en) * | 1981-09-02 | 1983-03-09 | Sony Corp | Color cathode-ray tube |
| US4631440A (en) * | 1985-04-29 | 1986-12-23 | North American Philips Consumer Electronics Corp. | Color cathode ray tube having smooth screen edges |
| GB8708574D0 (en) * | 1987-04-10 | 1987-05-13 | Philips Nv | Colour cathode ray tube |
| US5030881A (en) * | 1990-07-02 | 1991-07-09 | Rca Licensing Corporation | Color picture tube with shadow mask having improved aperture border |
| US5583391A (en) * | 1995-11-15 | 1996-12-10 | Thomson Consumer Electronics, Inc. | Color picture tube shadow mask having improved mask aperture pattern |
| KR100411512B1 (en) * | 1997-01-21 | 2004-02-14 | 엘지마이크론 주식회사 | Method for manufacturing effective portion of shadow mask |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7200212A (en) * | 1971-01-14 | 1972-07-18 | ||
| JPS5244511B2 (en) * | 1972-08-30 | 1977-11-08 | ||
| US3766419A (en) * | 1972-11-10 | 1973-10-16 | Rca Corp | Cathode-ray tube with shadow mask having random web distribution |
| JPS6024533B2 (en) * | 1973-12-10 | 1985-06-13 | 日本電気株式会社 | How to make a shadow mask |
| CA1065003A (en) * | 1975-05-05 | 1979-10-23 | Albert M. Morrell | Cathode ray tube having improved line-screen structure |
-
1977
- 1977-10-26 NL NL7711713A patent/NL7711713A/en not_active Application Discontinuation
-
1978
- 1978-10-19 CA CA000313787A patent/CA1121857A/en not_active Expired
- 1978-10-23 DE DE7878200260T patent/DE2860435D1/en not_active Expired
- 1978-10-23 JP JP13037478A patent/JPS5471556A/en active Pending
- 1978-10-23 EP EP78200260A patent/EP0001673B1/en not_active Expired
- 1978-10-23 IT IT29012/78A patent/IT1099429B/en active
- 1978-10-24 ES ES474452A patent/ES474452A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2860435D1 (en) | 1981-02-26 |
| EP0001673A2 (en) | 1979-05-02 |
| IT7829012A0 (en) | 1978-10-23 |
| EP0001673A3 (en) | 1979-05-16 |
| ES474452A1 (en) | 1979-10-16 |
| EP0001673B1 (en) | 1981-01-07 |
| JPS5471556A (en) | 1979-06-08 |
| IT1099429B (en) | 1985-09-18 |
| NL7711713A (en) | 1979-05-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |