WO2006131513A1 - Picture display device with a neck portion - Google Patents

Picture display device with a neck portion Download PDF

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Publication number
WO2006131513A1
WO2006131513A1 PCT/EP2006/062914 EP2006062914W WO2006131513A1 WO 2006131513 A1 WO2006131513 A1 WO 2006131513A1 EP 2006062914 W EP2006062914 W EP 2006062914W WO 2006131513 A1 WO2006131513 A1 WO 2006131513A1
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WO
WIPO (PCT)
Prior art keywords
weight
neck portion
glass
display device
picture display
Prior art date
Application number
PCT/EP2006/062914
Other languages
French (fr)
Inventor
Jan Hermans
Aroop Bhattacharjee
Van De Franciscus Wiel
Roy Alberts
Original Assignee
Lg.Philips Displays
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 Lg.Philips Displays filed Critical Lg.Philips Displays
Publication of WO2006131513A1 publication Critical patent/WO2006131513A1/en

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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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/863—Vessels or containers characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/86—Vessels and containers
    • H01J2229/8603—Neck or cone portions of the CRT vessel

Definitions

  • the invention relates to a picture display device comprising a display tube having an evacuated envelope with a display window, a conical portion and a neck portion.
  • the invention also relates to a neck portion for use in a picture display device.
  • CRTs cathode ray tubes
  • a picture display device of the type described in the opening paragraph is known.
  • the known picture display device has some drawbacks, notably a relatively high cost price of its neck portion.
  • a picture display device comprising a display tube comprising an evacuated envelope, the envelope comprising, around a longitudinal axis, a display window with a display screen on its inner side, a conical portion and a neck portion, the conical portion being connected to an upstanding wall of the display window, the neck portion accommodating an electron gun, the glass of the neck portion being substantially constituted of the glass of the display screen and/or the conical portion.
  • the neck portion is an essential part of a Cathode Ray Tube (CRT).
  • CRT Cathode Ray Tube
  • the neck portion provides the location for mounting the electron gun and the gun base, and also the connection for the vacuum pump.
  • the neck portions that are used nowadays, and the neck portions that have been used in the past, all consist of a glass with a relatively high lead oxide content, typically the PbO content is about 30% by weight.
  • the function of the neck portion is to accommodate the position of the electron gun in a CRT and to provide a vacuum tight seal with the conical (or funnel) portion and the gun base (the glass part which contains the pump tube and the electrical connections for the electron gun).
  • Table I gives an overview of the glass compositions that are known to have been used as neck portion glass compositions and also gives a number of characteristic properties.
  • neck portion glass Important for the application as neck portion glass are:
  • neck portions are quite an expensive type of glass product.
  • Reasons for this relatively high price per kg glass are:
  • a favorable embodiment of the picture display device according to the invention is characterized in that the composition of the glass component of the neck portion, expressed as a percentage by weight, comprises the following constituents:
  • SiO 2 and AI 2 O 3 the sum of the concentrations of SiO 2 and AI 2 O 3 being in the range from 50-65 weight%
  • BaO and/or SrO and/or ZrO 2 the sum of the concentrations of BaO and/or SrO and/or ZrO 2 being in the range from 0.5-10 weight%, and 10-25 weight% PbO.
  • composition of the glass component of the neck portion comprises the following constituents:
  • a very favorable embodiment of the picture display device according to the invention is characterized in that the composition of the glass component of the neck portion comprises the following constituents: 52-56 weight% SiO 2 ,
  • Na 2 O and K 2 O can be added to the glass of the neck portion as fluxes and to lower the tendency for crystallization.
  • Na 2 O and K 2 O also control the thermal expansion coefficient of the glass for matching the thermal expansion coefficient of the gun base and the glass of the cone (or funnel) portion.
  • the ratio Na 2 O/K 2 O controls the electrical resistivity of the glass and the working range (the difference between working point and softening point) of the glass.
  • CaO and, if desired MgO, are added to control the viscosity curve and to increase the electrical resistivity of the glass.
  • CaO (and MgO) also act as fluxes, at a lower price than Na 2 O and K 2 O, but added in an amount higher as the mentioned limit, CaO (and MgO) will stimulate crystallization of the glass of the neck portion and lower the working range in such a manner that the forming process by pressing or tube drawing will becomes relatively difficult.
  • a favorable embodiment of the picture display device according to the invention is characterized in that the neck portion has an absorption coefficient ⁇ of X-rays less than or equal to 70 cm "1 .
  • the absorption coefficient of X-ray is usually obtained at a wavelength of 0.06 nm.
  • the invention also relates to a neck portion for use in a picture display device.
  • Figure 1 is a cross-section of a picture display device comprising a cathode ray tube according to the invention.
  • Figure 1 very schematically shows a cross-sectional view of a picture display device comprising a cathode ray tube (CRT) having a longitudinal axis 20 and an evacuated envelope 1 comprising a display window 2, a conical portion 4 and a neck portion 5.
  • the neck portion 5 accommodates three electron guns 6, 7 and 8 for generating three electron beams 9, 10 and 11 which are usually co-planar, here the plane of the drawing.
  • a display screen 3 is provided on the inner surface of the display window 2.
  • the display screen 3 comprises a large number of red, green and blue-luminescent phosphor elements.
  • the electron beams 9, 10 and 1 1 are deflected in two mutually perpendicular directions (the so-called field and the so-called line deflection direction) by the deflection unit 14 across the display screen 3 and pass a color selection electrode 13 arranged in front of the display window 2, which electrode usually consists of a thin plate having apertures 12 and is referred to as shadow mask in this case.
  • the color selection electrode 12 is suspended to the inner side of the upstanding wall 15 of the display window 2 with the aid of suspension means 16.
  • the transition between the conical portion 4 and the upstanding wall 15 of the display window 2 is also referred to as the "seal edge" 19 where a (glass) frit is present, which frit serves as a sealing material.
  • the three electron beams 9, 10 and 11 pass the apertures 12 of the color selection electrode 13 at different angles and thus each impinge on phosphor elements of one color only.
  • the inner side of the conical portion 4 is usually coated with a conducting coating 18.
  • Tests were conducted wherein a test melt was made; the composition of the glass component corresponding to a composition according to the invention.
  • the glass was used to form neck portions. These neck portions were incorporated into CRT tubes to see how they perform, and what their characteristics with respect to X-ray safety and electrical properties were. Two different types of neck portions were produced: a so-called narrow neck portion and a so-called mini neck portion. The composition and properties of this batch were measured. Results are summarized in Table II. Table Il gives an overview of a typical glass composition for a neck portion according to the invention and its most characteristic properties.
  • the glass as described in Table Il also comprises 0.22 weight% Sb 2 O 3 as a refinement glass.
  • Sb 2 O 3 As a refinement glass.
  • upto 0.5 wt% of refining agent may be present in the glass.
  • the glass of the neck portion can also be refined with cerium oxide, chloride, As 2 O 3 or sulfate.
  • As 2 O 3 is not used anymore for safety and environmental reasons. Avoidance of Sb 2 O 3 may become a necessary in the future in view of environmental and/or safety reasons.
  • the neck portion of the display device had, at a wavelength of 0.06 nm, an absorption coefficient of X-ray ⁇ ⁇ 70 cm "1 .
  • the results of the CRT display devices with the neck glass portion manufactured according the glass with a composition to the invention were positive.
  • the X- ray safety measurements were met and the electrical properties were within the desired specification.

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  • Glass Compositions (AREA)

Abstract

The picture display device has a display tube comprising an evacuated envelope (1) comprising a display window (2) with a display screen (3) on its inner side, a conical portion (4) and a neck portion (5). The conical portion is connected to an upstanding wall (15) of the display window. The neck portion accommodates an electron gun (6, 7, 8). The conical portion comprises a glass component. The neck portion comprises a glass component with a composition that is substantially the same as that of the conical portion. Preferably, the neck portion comprises, expressed as a percentage by weight, the following constituents: SiO2 and Al2O3, the sum of the concentrations of SiO2 and Al2O3 being in the range from 50-65 weight%, BaO and/or SrO and/or ZrO2, the sum of the concentrations of BaO and/or SrO and/or ZrO2 being in the range from 0.5-10 weight%, and 10-25 weight% PbO.

Description

PICTURE DISPLAY DEVICE WITH A NECK PORTION.
FIELD OF THE INVENTION
The invention relates to a picture display device comprising a display tube having an evacuated envelope with a display window, a conical portion and a neck portion.
The invention also relates to a neck portion for use in a picture display device.
BACKGROUND OF THE INVENTION
Picture display devices of the type described in the opening paragraph are used, inter alia, in television apparatuses and computer monitors and are referred to as cathode ray tubes (CRTs).
A picture display device of the type described in the opening paragraph is known.
The known picture display device has some drawbacks, notably a relatively high cost price of its neck portion.
SUMMARY OF THE INVENTION
The invention has for its object to eliminate the above disadvantage wholly or partly. According to the invention, this object is achieved by a picture display device comprising a display tube comprising an evacuated envelope, the envelope comprising, around a longitudinal axis, a display window with a display screen on its inner side, a conical portion and a neck portion, the conical portion being connected to an upstanding wall of the display window, the neck portion accommodating an electron gun, the glass of the neck portion being substantially constituted of the glass of the display screen and/or the conical portion.
By manufacturing the neck portion from substantially the same material as the cone portion or from substantially the same material as the display screen, manufacturing of the neck portion is largely simplified thereby obtaining a considerable reduction in the cost price of the neck portion. The neck portion is an essential part of a Cathode Ray Tube (CRT). The neck portion provides the location for mounting the electron gun and the gun base, and also the connection for the vacuum pump. The neck portions that are used nowadays, and the neck portions that have been used in the past, all consist of a glass with a relatively high lead oxide content, typically the PbO content is about 30% by weight. The function of the neck portion is to accommodate the position of the electron gun in a CRT and to provide a vacuum tight seal with the conical (or funnel) portion and the gun base (the glass part which contains the pump tube and the electrical connections for the electron gun). Table I gives an overview of the glass compositions that are known to have been used as neck portion glass compositions and also gives a number of characteristic properties.
Table I Composition and properties of known neck glass types.
Figure imgf000004_0001
Important for the application as neck portion glass are:
- a sufficiently high X-ray absorption coefficient;
- a sufficiently high electrical resistance (measured as log ρ250); - an expansion coefficient that more or less matches that of (the glass composition of) the conical portion glass and of (the glass composition of) the gun base;
- a viscosity curve which allows processing in an easy way.
In general, neck portions are quite an expensive type of glass product. Reasons for this relatively high price per kg glass are:
- The production package for this glass type is rather small. This means that the depreciation and capital costs for the furnace and the forming equipment must be covered by a relatively low glass volume.
- The demands on the glass quality are very high. This means that the reject level is typically very high, and that intensive sorting is necessary to maintain a sufficiently high quality level. Especially bubbles are critical with respect to quality, since they tend to act as disturbances building up high voltage electrical charge.
It is desirable to make the neck portions in a more common glass type; this could bring large price advantages. Some reasons for this are: - The depreciation per product is less for a larger furnace, if it is fully loaded.
- In general, larger furnaces are able to produce a better glass quality, because the ratio refractory surface area to glass melt volume is lower for a larger furnace.
- The energy consumption per kg produced glass of a larger furnace is much lower as that of a smaller furnace. - Automatic inspection is easier to arrange for a larger production volume.
- For a more common glass type, there will be more suppliers, and more competition, so a better price can be obtained.
A favorable embodiment of the picture display device according to the invention is characterized in that the composition of the glass component of the neck portion, expressed as a percentage by weight, comprises the following constituents:
SiO2 and AI2O3, the sum of the concentrations of SiO2 and AI2O3 being in the range from 50-65 weight%,
BaO and/or SrO and/or ZrO2, the sum of the concentrations of BaO and/or SrO and/or ZrO2 being in the range from 0.5-10 weight%, and 10-25 weight% PbO.
Lowering the amount of lead oxide in the glass of the neck portion as compared to known neck glass reduces the X-ray absorption of the glass. However, this effect is to some extent compensated by the presence in the glass of the neck portion according to the invention of BaO and/or SrO and/or ZrO2 in the concentration range as shown hereinabove. BaO and SrO are introduced in the glass of the neck portion from recycle cullet. SiO2 and AI2O3 more or less have the same function in the neck glass. In addition, AI2O3 is included in the glass of the neck portion to reduce crystallization and to enable the use of recycle cullet.
Preferably, the composition of the glass component of the neck portion comprises the following constituents:
50-60 weight% SiO2,
0.5-5 weight% AI2O3,
0.1-5 weight% BaO,
0.1-5 weight% SrO, 0.05-2 weight% ZrO2,
10-25 weight% PbO.
A very favorable embodiment of the picture display device according to the invention is characterized in that the composition of the glass component of the neck portion comprises the following constituents: 52-56 weight% SiO2,
0.5-3 weight% AI2O3,
0.5-4 weight% CaO,
0.1-3 weight% BaO,
0.1-3 weight% SrO, 0.05-1 weight% ZrO2,
15-20 weight% PbO.
Na2O and K2O can be added to the glass of the neck portion as fluxes and to lower the tendency for crystallization. Na2O and K2O also control the thermal expansion coefficient of the glass for matching the thermal expansion coefficient of the gun base and the glass of the cone (or funnel) portion. The ratio Na2O/K2O controls the electrical resistivity of the glass and the working range (the difference between working point and softening point) of the glass. CaO and, if desired MgO, are added to control the viscosity curve and to increase the electrical resistivity of the glass. CaO (and MgO) also act as fluxes, at a lower price than Na2O and K2O, but added in an amount higher as the mentioned limit, CaO (and MgO) will stimulate crystallization of the glass of the neck portion and lower the working range in such a manner that the forming process by pressing or tube drawing will becomes relatively difficult.
A favorable embodiment of the picture display device according to the invention is characterized in that the neck portion has an absorption coefficient μ of X-rays less than or equal to 70 cm"1. The absorption coefficient of X-ray is usually obtained at a wavelength of 0.06 nm.
The invention also relates to a neck portion for use in a picture display device.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other aspects of the invention are apparent from and will be elucidated with reference to the embodiments described hereinafter.
In the drawings: Figure 1 is a cross-section of a picture display device comprising a cathode ray tube according to the invention.
The Figures are purely diagrammatic and not drawn to scale. Notably, some dimensions are shown in a strongly exaggerated form for the sake of clarity. Similar components in the Figures are denoted as much as possible by the same reference numerals.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figure 1 very schematically shows a cross-sectional view of a picture display device comprising a cathode ray tube (CRT) having a longitudinal axis 20 and an evacuated envelope 1 comprising a display window 2, a conical portion 4 and a neck portion 5. In this embodiment, the neck portion 5 accommodates three electron guns 6, 7 and 8 for generating three electron beams 9, 10 and 11 which are usually co-planar, here the plane of the drawing. A display screen 3 is provided on the inner surface of the display window 2. The display screen 3 comprises a large number of red, green and blue-luminescent phosphor elements. On their way to the display screen 3, the electron beams 9, 10 and 1 1 are deflected in two mutually perpendicular directions (the so-called field and the so-called line deflection direction) by the deflection unit 14 across the display screen 3 and pass a color selection electrode 13 arranged in front of the display window 2, which electrode usually consists of a thin plate having apertures 12 and is referred to as shadow mask in this case. The color selection electrode 12 is suspended to the inner side of the upstanding wall 15 of the display window 2 with the aid of suspension means 16. The transition between the conical portion 4 and the upstanding wall 15 of the display window 2 is also referred to as the "seal edge" 19 where a (glass) frit is present, which frit serves as a sealing material. The three electron beams 9, 10 and 11 pass the apertures 12 of the color selection electrode 13 at different angles and thus each impinge on phosphor elements of one color only. The inner side of the conical portion 4 is usually coated with a conducting coating 18.
Tests were conducted wherein a test melt was made; the composition of the glass component corresponding to a composition according to the invention. The glass was used to form neck portions. These neck portions were incorporated into CRT tubes to see how they perform, and what their characteristics with respect to X-ray safety and electrical properties were. Two different types of neck portions were produced: a so-called narrow neck portion and a so-called mini neck portion. The composition and properties of this batch were measured. Results are summarized in Table II. Table Il gives an overview of a typical glass composition for a neck portion according to the invention and its most characteristic properties.
Table Il Composition and properties of a neck glass according to the invention known neck glass types
Figure imgf000009_0001
In addition to the above composition, the glass as described in Table Il also comprises 0.22 weight% Sb2O3 as a refinement glass. In general upto 0.5 wt% of refining agent may be present in the glass. Apart from Sb2O3, the glass of the neck portion can also be refined with cerium oxide, chloride, As2O3 or sulfate. At present, As2O3 is not used anymore for safety and environmental reasons. Avoidance of Sb2O3 may become a necessary in the future in view of environmental and/or safety reasons.
The neck portion of the display device had, at a wavelength of 0.06 nm, an absorption coefficient of X-ray μ ≤ 70 cm"1. The results of the CRT display devices with the neck glass portion manufactured according the glass with a composition to the invention were positive. The X- ray safety measurements were met and the electrical properties were within the desired specification. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A picture display device comprising a display tube comprising an evacuated envelope (1 ), the envelope (1 ) comprising, around a longitudinal axis (20), a display window (2) with a display screen (3) on its inner side, a conical portion (4) and a neck portion (5), the conical portion (4) being connected to an upstanding wall (15) of the display window (2), the neck portion (5) accommodating an electron gun (6, 7, 8), the glass of the neck portion (5) being substantially constituted of the glass of the display screen (3) and/or the conical portion (4).
2. A picture display device as claimed in claim 1 , wherein the composition of the glass component of the neck portion (5) comprises, expressed as a percentage by weight, the following constituents:
SiO2 and AI2O3, the sum of the concentrations of SiO2 and AI2O3 being in the range from 50-65 weight%,
BaO and/or SrO and/or ZrO2, the sum of the concentrations of BaO and/or SrO and/or ZrO2 being in the range from 0.5-10 weight%, and 10-25 weight% PbO.
3. A picture display device as claimed in claim 2, wherein the composition of the glass component of the neck portion (5) comprises the following constituents:
50-60 weight% SiO2,
0.5-5 weight% AI2O3,
0.1-5 weight% BaO, 0.1-5 weight% SrO,
0.05-2 weight% ZrO2,
10-25 weight% PbO.
4. A picture display device as claimed in claim 3, wherein the composition of the glass component of the neck portion (5) comprises the following constituents: 52-56 weight% SiO2, 0.5-3 weight% AI2O3, 0.5-4 weight% CaO, 0.1-3 weight% BaO, 0.1-3 weight% SrO,
0.05-1 weight% ZrO2, 15-20 weight% PbO.
5. A picture display device as in any of the preceding claims, wherein the neck portion (5) has a absorption coefficient μ of X-rays less than or equal to 70 cm"1.
6. A neck portion (5) for use in a picture display device as claimed in any of the preceding claims.
PCT/EP2006/062914 2005-06-08 2006-06-06 Picture display device with a neck portion WO2006131513A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05105019.3 2005-06-08
EP05105019A EP1732100A1 (en) 2005-06-08 2005-06-08 Picture display device with a neck portion

Publications (1)

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WO2006131513A1 true WO2006131513A1 (en) 2006-12-14

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1313243A (en) * 1970-09-04 1973-04-11 Tokyo Shibaura Electric Co Cathode ray tube
US20030164671A1 (en) * 1999-06-29 2003-09-04 Asahi Glass Company, Ltd. Glass funnel for a cathode ray tube and a cathode ray tube
EP1433759A1 (en) * 2001-09-05 2004-06-30 Nippon Electric Glass Co., Ltd FUNNEL GLASS FOR CATHODE−RAY TUBE
US20040259715A1 (en) * 2001-07-27 2004-12-23 Nippon Electric Glass Co., Ltd. Method of preparing CRT funnel glass capable of effectively recycling another glass member
US20050052135A1 (en) * 2002-03-05 2005-03-10 Asahi Glass Company Limited Glass funnel for cathode ray tube, and cathode ray tube

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1313243A (en) * 1970-09-04 1973-04-11 Tokyo Shibaura Electric Co Cathode ray tube
US20030164671A1 (en) * 1999-06-29 2003-09-04 Asahi Glass Company, Ltd. Glass funnel for a cathode ray tube and a cathode ray tube
US20040259715A1 (en) * 2001-07-27 2004-12-23 Nippon Electric Glass Co., Ltd. Method of preparing CRT funnel glass capable of effectively recycling another glass member
EP1433759A1 (en) * 2001-09-05 2004-06-30 Nippon Electric Glass Co., Ltd FUNNEL GLASS FOR CATHODE−RAY TUBE
US20050052135A1 (en) * 2002-03-05 2005-03-10 Asahi Glass Company Limited Glass funnel for cathode ray tube, and cathode ray tube

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