EP0001673A2 - Colour selection electrode with elongate apertures in a colour display tube - Google Patents

Colour selection electrode with elongate apertures in a colour display tube Download PDF

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Publication number
EP0001673A2
EP0001673A2 EP78200260A EP78200260A EP0001673A2 EP 0001673 A2 EP0001673 A2 EP 0001673A2 EP 78200260 A EP78200260 A EP 78200260A EP 78200260 A EP78200260 A EP 78200260A EP 0001673 A2 EP0001673 A2 EP 0001673A2
Authority
EP
European Patent Office
Prior art keywords
colour
rows
selection electrode
apertures
situated
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.)
Granted
Application number
EP78200260A
Other languages
German (de)
French (fr)
Other versions
EP0001673B1 (en
EP0001673A3 (en
Inventor
Gerardus Wilhelmus Plukker
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0001673A2 publication Critical patent/EP0001673A2/en
Publication of EP0001673A3 publication Critical patent/EP0001673A3/en
Application granted granted Critical
Publication of EP0001673B1 publication Critical patent/EP0001673B1/en
Expired 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
    • H01J29/06—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

Definitions

  • 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.
  • a photosensitive phosphor-containing layer is provided a few times successively (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 carrier 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 homogeneous as possible.
  • a colour display tube of the kind described in the first paragraph is 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 the extreme ends are situated on lines which follow the edges of the colour selection electrode. Generally these edges are curved since the aperture which is situated at the ends of each row is as long as but usually is longer than the penultimate aperture, more light will impinge on the photosensitive phosphor-containing layer during exposure and the end of the phosphor line will adhere better to the inner wall of the display window.
  • FIG. 1 is a perspective view, partly broken away. of a colour display tube made in accordance with the invention.
  • This colour display tube comprises a glass envelope 1 which is composed of a display window 2, a cone 3 and a neck 4 having contact pins 5.
  • Three electron guns 6, 7 and 8 are situated in the neck. The axes of these guns are situated in one horizontal plane and the outermost guns enclose a small angle with the central gun, so that the generated electron beams 9, '10 and 11 pass through apertures 12 in a colour selection electrode 13 at an angle and thus each impinge on phosphor lines 14, 15 and 16, respectively.
  • the whole display screen 17 consists of such triplets of phosphor lines of which three are shown.
  • Phosphor line 14 is a phosphor luminescing red (R)
  • phosphor line 15 is a phosphor luminescing green (G)
  • phosphor line 16 is a phosphor luminescing blue (B).
  • Colour selection electrode 13 consists of a metal plate having a very large number of rows of apertures 12 extending in the direction of the phosphor lines, which plate is secured in a metal ring 18 which is mounted in the display tube in front of the display screen.
  • Figure 2 is a perspective view of a part of the colour selection electrode 13 and the display screen 17.
  • the apertures 12 of each row are separated by bridges 19.
  • the elongate apertures usually have rounded-off short sides.
  • Figure 3 is an elevation of a part of an upper edge of a known colour selection electrode.
  • aner- tures 20 are obtained which are shorter than the adjacent apertures 12.
  • an insufficient amount of light passes through the said apertures and an unsatisfactory adhesion of the ends of the phosphor lines to the display window is obtained.
  • Figure 4 is an elevation of a part of the upper edge of the colour selection electrode as disclosed in United States Patent Specification 3, 983,613. The smaller apertures are omitted. The picture boundary shown in Figure 3 and the adhesion of the ends of the phosphor lines still leaves something to be desired.
  • Figure 5 is an elevation of a part of the upper edge of the colour selection electrode to be used in the cathode ray tube shown in Figure 1 .
  • the length of the last apertures 22 is always larger than or equal to the length of the adjacent apertures 12 in the row.
  • the short sides of the last apertures 22 of all rows situated at the extreme end are situated on a smooth curved line which follows the edge 21 of the colour selection electrode. Since the apertures 22 are extra long a better adhesion of the phosphor lines to the inner wall of the display window is obtained during the mannfacture of the said lines as a result of the extra good exposure at the ends. These longer apertures at the same time ensure a beautiful smooth picture boundary.

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.

Description

  • 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. During the manufacture of the display screen, a photosensitive phosphor-containing layer is provided a few times successively (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 carrier 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 homogeneous as possible. It has now been found that the adhesion of the ends of the phosphor lines in the tubes manufactured so far has left something to be desired. A staggered variation caused by the ends of the rows of apertures, as shown in the United States Patent Specification 3,983,613, also proved to be a less beautiful picture boundary, and the adhesion of the ends of the phosphor lines still leaves something to be desired.
  • It is therefore the object of the invention to provide a colour display tube in which the apertures follow the upper and lower edges of the colour selection electrode and in which a good adhesion of the ends of the phosphor lines is obtained.
  • According to the invention a colour display tube of the kind described in the first paragraph is 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 the extreme ends are situated on lines which follow the edges of the colour selection electrode. Generally these edges are curved since the aperture which is situated at the ends of each row is as long as but usually is longer than the penultimate aperture, more light will impinge on the photosensitive phosphor-containing layer during exposure and the end of the phosphor line will adhere better to the inner wall of the display window.
  • The invention will now be explained and described in greater detail by way of example with reference to the accompanying drawings in which
    • Figure 1 is a perspective view, partly broken away., of a colour display tube made in accordance with the invention,
    • Figure 2 is a perspective view of the encircled part of the colour selection electrode and the display screen,
    • Figures 3 and 4 are elevations of a part of the upper edge of a colour selection electrode as used so far, and
    • Figure 5.is an elevation of a part of the upper edge of a colour selection electrode used in the cathode ray tube made in accordance with the invention.
  • Figure 1 is a perspective view, partly broken away. of a colour display tube made in accordance with the invention. This colour display tube comprises a glass envelope 1 which is composed of a display window 2, a cone 3 and a neck 4 having contact pins 5. Three electron guns 6, 7 and 8 are situated in the neck. The axes of these guns are situated in one horizontal plane and the outermost guns enclose a small angle with the central gun, so that the generated electron beams 9, '10 and 11 pass through apertures 12 in a colour selection electrode 13 at an angle and thus each impinge on phosphor lines 14, 15 and 16, respectively. The whole display screen 17 consists of such triplets of phosphor lines of which three are shown. Phosphor line 14 is a phosphor luminescing red (R), phosphor line 15 is a phosphor luminescing green (G) and phosphor line 16 is a phosphor luminescing blue (B). Colour selection electrode 13 consists of a metal plate having a very large number of rows of apertures 12 extending in the direction of the phosphor lines, which plate is secured in a metal ring 18 which is mounted in the display tube in front of the display screen.
  • Figure 2 is a perspective view of a part of the colour selection electrode 13 and the display screen 17. The apertures 12 of each row are separated by bridges 19. The elongate apertures usually have rounded-off short sides.
  • Figure 3 is an elevation of a part of an upper edge of a known colour selection electrode. As a result of the curved shape of the said upper edge, aner- tures 20 are obtained which are shorter than the adjacent apertures 12. During the manufacture of the display sereen an insufficient amount of light passes through the said apertures and an unsatisfactory adhesion of the ends of the phosphor lines to the display window is obtained.
  • Figure 4 is an elevation of a part of the upper edge of the colour selection electrode as disclosed in United States Patent Specification 3, 983,613. The smaller apertures are omitted. The picture boundary shown in Figure 3 and the adhesion of the ends of the phosphor lines still leaves something to be desired.
  • Figure 5 is an elevation of a part of the upper edge of the colour selection electrode to be used in the cathode ray tube shown in Figure 1 . The length of the last apertures 22 is always larger than or equal to the length of the adjacent apertures 12 in the row. As a result of this, the short sides of the last apertures 22 of all rows situated at the extreme end are situated on a smooth curved line which follows the edge 21 of the colour selection electrode. Since the apertures 22 are extra long a better adhesion of the phosphor lines to the inner wall of the display window is obtained during the mannfacture of the said lines as a result of the extra good exposure at the ends. These longer apertures at the same time ensure a beautiful smooth picture boundary.

Claims (2)

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 lumines- eing in three different colours and, at some distance in front of said display screen, a colour select on 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, 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 the extreme ends 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.
EP78200260A 1977-10-26 1978-10-23 Colour selection electrode with elongate apertures in a colour display tube Expired EP0001673B1 (en)

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 (3)

Publication Number Publication Date
EP0001673A2 true EP0001673A2 (en) 1979-05-02
EP0001673A3 EP0001673A3 (en) 1979-05-16
EP0001673B1 EP0001673B1 (en) 1981-01-07

Family

ID=19829406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78200260A Expired EP0001673B1 (en) 1977-10-26 1978-10-23 Colour selection electrode with elongate apertures in a 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203636A2 (en) * 1985-04-29 1986-12-03 North American Philips Consumer Electronics Corp. Colour cathode ray tube having smooth screen edges
EP0286187A2 (en) * 1987-04-10 1988-10-12 Koninklijke Philips Electronics N.V. Colour cathode ray tube
GB2247774A (en) * 1990-07-02 1992-03-11 Thomson Consumer Electronics Color picture tube having shadow mask
EP0774770A1 (en) * 1995-11-15 1997-05-21 Thomson Consumer Electronics, Inc. Shadow mask aperture pattern for color picture tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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
KR100411512B1 (en) * 1997-01-21 2004-02-14 엘지마이크론 주식회사 Method for manufacturing effective portion of shadow mask

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2121826A3 (en) * 1971-01-14 1972-08-25 Ergon Spa
US3766419A (en) * 1972-11-10 1973-10-16 Rca Corp Cathode-ray tube with shadow mask having random web distribution
FR2198259A1 (en) * 1972-08-30 1974-03-29 Tokyo Shibaura Electric Co
US3925700A (en) * 1973-12-10 1975-12-09 Nippon Electric Co Shadow mask for a black-stripe color picture tube having successively curved perforations
FR2310628A1 (en) * 1975-05-05 1976-12-03 Rca Corp SCREEN STRUCTURE FOR CATHODIC RAY TUBE, ESPECIALLY FOR COLOR TELEVISION

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2121826A3 (en) * 1971-01-14 1972-08-25 Ergon Spa
FR2198259A1 (en) * 1972-08-30 1974-03-29 Tokyo Shibaura Electric Co
US3766419A (en) * 1972-11-10 1973-10-16 Rca Corp Cathode-ray tube with shadow mask having random web distribution
US3925700A (en) * 1973-12-10 1975-12-09 Nippon Electric Co Shadow mask for a black-stripe color picture tube having successively curved perforations
FR2310628A1 (en) * 1975-05-05 1976-12-03 Rca Corp SCREEN STRUCTURE FOR CATHODIC RAY TUBE, ESPECIALLY FOR COLOR TELEVISION

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203636A2 (en) * 1985-04-29 1986-12-03 North American Philips Consumer Electronics Corp. Colour cathode ray tube having smooth screen edges
EP0203636A3 (en) * 1985-04-29 1987-11-11 North American Philips Consumer Electronics Corp. Colour cathode ray tube having smooth screen edges
EP0286187A2 (en) * 1987-04-10 1988-10-12 Koninklijke Philips Electronics N.V. Colour cathode ray tube
EP0286187A3 (en) * 1987-04-10 1989-09-20 Koninklijke Philips Electronics N.V. Colour cathode ray tube
GB2247774A (en) * 1990-07-02 1992-03-11 Thomson Consumer Electronics Color picture tube having shadow mask
TR25634A (en) * 1990-07-02 1993-07-01 Thomson Consumer Electronics COLORED PICTURE WITH ADVANCED SHADOW MASK
GB2247774B (en) * 1990-07-02 1994-06-15 Thomson Consumer Electronics Color picture tube having shadow mask
EP0774770A1 (en) * 1995-11-15 1997-05-21 Thomson Consumer Electronics, Inc. Shadow mask aperture pattern for color picture tube
SG96538A1 (en) * 1995-11-15 2003-06-16 Thomson Consumer Electronics Color picture having improved shadow mask aperture pattern

Also Published As

Publication number Publication date
CA1121857A (en) 1982-04-13
NL7711713A (en) 1979-05-01
EP0001673B1 (en) 1981-01-07
EP0001673A3 (en) 1979-05-16
ES474452A1 (en) 1979-10-16
DE2860435D1 (en) 1981-02-26
IT1099429B (en) 1985-09-18
JPS5471556A (en) 1979-06-08
IT7829012A0 (en) 1978-10-23

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